43results about How to "Good thermal hardness" patented technology

The invention relates to the field of diamond saw blades, in particular to diamond saw blade tip powder, a diamond saw blade and a preparation method of the diamond saw blade. The diamond saw blade tip powder for ceramic tile dry cutting comprises the following components of, by weight, 35-49 parts of alloy powder, 20-30 parts of 300 mesh copper powder, 10-14 parts of nickel powder, 10 parts of tin powder, 3-7 parts of ferrophosphorus, 4 parts of carbonyl iron powder and 1-1.3 parts of diamond particles; and the alloy powder comprises the following components of, by weight, 49-71% of iron, 20-24% of copper, 13-15% of cobalt, 3% of tin and 1% of phosphorus. The diamond saw blade for ceramic tile dry cutting is prepared from the above components. The preparation method of the diamond saw blade for ceramic tile dry cutting comprises the following steps of (1) preparation of the alloy powder, (2) preparation of the blade tip powder, and (3) sintering. The diamond saw blade which is high incutting speed and long in service life, the blade tip powder and the blade preparation method are provided.

The invention discloses a preparation method for anticorrosion steel used for a water-cooling spray nozzle. The method comprises the following steps that raw materials are heated into a molten state to obtain a liquid alloy, wherein the liquid alloy comprises, by weight, 0.1-0.25% of C, 1.2-1.5% of Cr, 0.3-0.6% of Al, 1.2-1.6% of Mg, 0.2-0.3% of Zr, 0.4-0.6% of Ni, 1.2-1.3% of Mn, 0.08-0.12% of Mo, 0.1-0.13% of V, 0.03-0.06% of Co, 0.02-0.05% of Ga, 1.5-1.6% of T, 0.6-0.8% of Si and the balance Fe; a steel billet is obtained through casting; heat treatment is conducted; boriding is conducted; and the steel billet subjected to heat treatment and boriding is coated with a conversion film.

The invention discloses ultra-wear-resistant H13 mold steel, and belongs to the field of mold steel. The ultra-wear-resistant H13 mold steel comprises the following chemical element ingredients in parts by weight: 0.46 to 0.49 part of C, 0.81 to 0.92 part of Si, 0.32 to 0.46 part of Mn, 0.008 to 0.011 part of P, 0.001 to 0.003 part of S, 4.36 to 6.25 parts of Cr, 0.04 to 0.23 part of Ni, 0.01 to 0.1 part of Cu, 1.01 to 1.36 parts of Mo, 0.08 to 1.27 parts of V and the balance of Fe. By aiming at the problem of poor wear resistance of the H13 mold steel in the prior art, the ultra-wear-resistant H13 mold steel has the advantages that the wear-resistant performance of the H13 mold can be improved.

The invention discloses a preparing method for wear-resisting steel used for a water-cooling nozzle. The preparing method includes the following steps that smelting and pouring are conducted; heat treatment is conducted; a steel billet obtained after heat treatment is subjected to pretreatment and then put into a boriding agent, the temperature is increased to 910 DEG C to 930 DEG C, heat insulation is conducted for 6 h to 7 h, and then a steel billet generated after boriding is obtained; and covering of a conversion film is conducted. The use amount of the boriding agent ranges from 1.3 g / cm<2> to 1.6 g / cm<2>, and the boriding agent includes, by weight, 4-6 parts of boron carbide, 10-15 parts of borax, 3-4 parts of potassium fluoborate, 0.5-1 part of sodium fluosilicate, 5-7 parts of sodium bicarbonate, 40-50 parts of silicon carbide and 30-35 parts of activated carbon. Covering of the conversion film includes the specific steps that the steel billet generated after boriding is cleaned and then put into a conversion solution, the temperature is increased to 40 DEG C to 50 DEG C, heat insulation is conducted for 18 min to 22 min, and the wear-resisting steel used for the water-cooling nozzle is obtained through drying. The wear-resisting steel has good wear-resisting performance and is good in corrosion resistance performance and high temperature resistance performance.

The invention discloses a method for electroforming a Co-Ni alloy coating on a copper plate for a continuous casting crystallizer. The method comprises the steps of polishing, oil removing, water scrubbing, back engraving and Co-Ni electroforming. By adopting the method, the electroformed layer is exquisite, the coating is high in hardness and better in hot hardness, and because the coating is high in hardness and good in hot hardness, the abrasion resistance of the copper plate at high temperature is greatly improved, and the steel loading capacity of the copper plate can reach 0.15-0.20 million tons. Besides, the electroforming solution is good in dispersibility, so that the coating is strong in covering capacity and good in leveling performance. Moreover, the copper alloy electrolysis etching solution is an alkalescent solution, and the surface of a chromium-zirconium-copper alloy part can obtain sand-like pearly luster with a uniform color through anode electrolysis etching, so that the bonding force of the coating is improved, the electroformed layer can not generate dross easily, the electroformed layers on high and low areas are relatively uniform, machining wastes of the coating are reduced, and the utilization ratio of raw materials is improved. The method is suitable for electroforming the Co-Ni alloy coating on the copper plate for the continuous casting crystallizer.

The invention discloses a method for machining a large-radius arc-section spiral groove. The method combines enveloping machining with forming machining, the large-arc-radius spiral groove is machined in the mode that multiple small-arc-radius spiral lines are machined so that selection of cutter nose radiuses is not limited by the radius of a section needing to be machined, the cutting state is improved, cutting resistance and cutter breaking phenomena are reduced, and precise machining of the large-radius arc-section spiral groove is achieved. A small-diameter forming cutter is used, on one hand, a high linear cutting speed is achieved, a machined surface is strengthened, and surface quality is improved, and on the other hand, a curved surface enveloped by the small-diameter forming cutter has higher surface roughness. By means of numerical control programs, spatial arrangement precision of tiny-section spiral lines is controlled so that shape precision of a section arc of the spiral groove can be below 0.04 mm, and the size and position precision can be below 0.03 mm / 1000 mm. According to the method, the surface roughness of the machined spiral groove can be improved by increasing the number of the spiral lines enveloping the section arc of the spiral groove, and the highest surface roughness can be below Ra 0.8.

The invention relates to a braking bar for a motor vehicle and a novel braking system, which belong to the technical field of mechanical manufacturing. The prior braking technology utilizes the friction of braking parts on vehicle wheels to realize brake, so the brake distance is long, the brake is not timely, and thus accidents happen frequently. The invention provides the braking bar and the novel braking system. The braking bar is a cylindrical alloy bar with different upper and lower ends. The upper end is a piston and the lower end is produced into a sharp oxhorn shape. The piston is directly inserted into a piston cylinder. A control part adopts a mechanical or electronic circuit. When the control part sends a command, a power cylinder works to forcibly push the braking bar out and then into a road surface to realize the brake. Due to the achievement of short brake distance and timely brake, the system can be widely used in various vehicles, such as long-distance buses, trucks, off-road vehicles, motorcycles, special vehicles, electric cars, hybrid power vehicles, pickups, sports cars, various saloon cars, and the like, so as to reduce traffic accidents and improve the vehicle safety.

The invention discloses a high-carbon steel ultrathin alloy ribbon and the preparation technology thereof. The alloy ribbon comprises a base material of the high-carbon steel ultrathin alloy ribbon and a plating material; the base material of the high-carbon steel ultrathin alloy ribbon comprises the following ingredients, by weight: 1-10% of carbon, 18-22% of zinc, 1.2-2.4% of magnesium, 12-20% of copper, 5.5-7.5% aluminum, 0.05-0.15% of sulfur, 0.02-0.08% of phosphorus, 0.01-0.11% of chromium, 0.3-1.3% of manganese, 0.5-1.5% of barium sulfate, 0.2-0.6% of nickel, 0.1-0.6% of silicon, 0.1-0.8% of cadmium, 0.3-0.7% of scandium, 0.2-0.4% of strontium, 4-8% of nanometer ceramic powder, 0.3-0.5% of caesium, 1-5% of dibenzenesulfonamide and the balance iron; the plating material comprises, by weight, 22-28 parts of zinc, 14-18 parts of aluminum, 2-6 parts of fluorescent brightener, 1-6 parts of surfactant, 0.5-2.5 parts of indium, 1-3 parts of antioxidant and 0.2-0.8 parts of selenium. The invention achieves the advantages of reasonable formula and scientific technology, not only retains the excellent properties of the high-carbon steel including Stretch Resistance, high hardness, shock resistance, low production cost, safety and reliability, but also achieves the alloy ribbon that is ultrathin and not liable to break, and has good malleability.

The invention discloses a production method of cold-rolled bright strip steel. The production method of the cold-rolled bright strip steel comprises the following steps: (1) batching, (2) smelting, (3) compression molding, (4) annealing treatment, (5) cold-rolling, (6) uncoiling, (7) welding, and (8) cleaning and drying to obtain the cold-rolled bright strip steel. The cold-rolled bright strip steel produced by the invention not only has high dimensional accuracy, bright surface, high magnetic induction, low iron loss, low surface roughness, uniform thickness, high lamination factor and good blanking property, but also has excellent hardness, good stretching resistance, good hot hardness, high hardenability, difficulty in deformation and cracking, high plasticity, toughness and elasticity, high strength of a welded joint and the like, and can replace a thick hot-rolled strip for the same purpose so as to reduce the use amount of steel, and the economic significance is large.

The invention relates to a laser repairing method for allowing the roller surface of a hot roller to have good thermal hardness after repairing. A transitional alloy layer, an intermediate alloy layer and a surface alloy layer are arranged on the surface of the hot roller in a laser cladding mode from inside one by one. The alloy powder adopted by the transitional alloy layer comprises, by mass, 0.21%-0.31% of C, 3.2%-3.6% of Si, 1.0%-1.1% of B, 2.2%-2.6% of Fe, 7%-8% of Cr and the balance Ni. The alloy powder adopted by the intermediate alloy layer comprises, by mass, 0.4%-0.5% of C, 3.8%-4.3% of Si, 11.2%-11.93% of B, 2.5%-3.2% of Fe, 10%-12% of Cr and the balance Ni. The alloy powder adopted by the surface alloy layer comprises, by mass, 0.05%-0.1% of C, 3.2%-3.6% of Si, 2%-4% of Fe, 16%-19% of Cr, 27%-30% of Mo and the balance Co. The surface of the hot roller repaired by using the laser repairing method for the hot roller has good abrasion resistance, corrosion resistance and thermal hardness, toughness and strength are taken into account in the interior, and the effect of laser cladding is good.

A high-speed steel for high-strength and wear-resistant cutters is composed of, by weight, 1.2-1.6% of C, 0.55-0.85% of Si, 1.10-1.30% of Mn, 5.50-6.50% of Cr, 3.40-4.40% of Mo, 1.05-1.15% of V, 0.50-0.70% of Nb, 0.02-0.04% of Ti, 1.60-1.90% of W, 0.03-0.05% of Re, 0.0008-0.003% of B, 0.05-0.09% of N, P smaller than or equal to 0.015%, S smaller than or equal to 0.015% and the balance Fe and inevitable impurities. The high-speed steel is high in strength, good in wear resistance, thermal hardness and machinability and low in production cost.

The present invention relates to a low roller deformation hot roller laser repair method, wherein a transition alloy layer, an intermediate alloy layer and a surface alloy layer are sequentially subjected to laser cladding on the surface of a hot roller from the inner layer, the components of the alley powder used by the transition alloy layer comprise, by mass, 0.2-0.3% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, 7-8% of Cr and the balance of Ni, the components of the alley powder used by the intermediate alloy layer comprise, by mass, 0.4-0.5% of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, 10-12% of Cr and the balance of Ni, and the components of the alley powder used by the surface alloy layer comprise, by mass, 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr, 27-30% of Mo, and the balance of Co. According to the present invention, the hot roller repaired by using the hot roller laser repair method of the present invention has good abrasion resistance, good corrosion resistance and good thermal rigidity of the surface, has good toughness and good strength of the internal, and has good laser cladding effect.

The invention discloses an alloy steel forged brake disc with characteristics of inhibiting friction sparks. The alloy steel forged brake disc with the characteristics of inhibiting the friction sparks is prepared from the following components in mass by percentage: 0.1-0.15 of C, 1.0-1.5 of Cr, 1.0-2.0 of Mo, 0.5-1.0 of W, 0.2-0.8 of Mn, 0.1-0.5 of Ti, 0.5-0.8 of Cu, 0.05-0.1 of Nb, 0.05-0.1 of V, 0.005-0.015 of N, 0.001-0.008 of RE, less than or equal to 0.005 of P, less than or equal to 0.02 of S and the balance of Fe and inevitable impurities. The invention further discloses a manufacturing method of the alloy steel forged brake disc with the characteristics of inhibiting the friction sparks. Special alloy steel is designed. Through forging and heat treatment processes, the brake dischas excellent strength and toughness, the high-temperature mechanical property, the wear resistance and the thermal crack resistance, and has good characteristics of inhibiting the friction sparks.

The invention relates to a hot roller laser restoration method capable of prolonging the service lifetime of a hot roller. A transitional alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of the hot roller. Alloy powder adopted by the transitional alloy layer includes components by mass: 0.12-0.19% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5 % of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

The invention discloses a manufacturing method facilitating prolonging of the service life of a turning tool. The method comprises steps of workblank blanking, forging, cutting, heat treatment and grinding which are performed sequentially, wherein the workblank adopts W2MoCr4V2Co8 high-speed tool steel; the heat treatment comprises steps of preheating, heating and heat insulation, quenching and tempering which are performed sequentially, and the preheating is performed by gradually warming by stages; the quenching adopts oil cooling; and the follow-up step of the tempering procedure further comprises cold treatment, pretreatment before the cold treatment is performed between the cold treatment step and the tempering procedure, the follow-up step of the cold treatment further comprises water bath tempering, the cold treatment comprises the step that the workblank obtained from the previous step is subjected to liquid nitrogen cold treatment at the temperature ranging from subzero 80 DEG C to subzero 150 DEG C, the pretreatment before the cold treatment comprises the step that the worblank is boiled for not less than 40 min at the temperature ranging from 90 DEG C to 100 DEG C or subjected to low-temperature tempering for not less than 1 h, and the water bath tempering comprises the step that the workblank obtained from the previous step is boiled for not less than 1.5 h. The process route is simple, the austenitic residue quantity is low, and the product has good wear resistance and red hardness.

The invention relates to a laser repairing method of a hot roll good in laser cladding effect. The surface of the hot roll is laser-cladded with a transition alloy layer, an intermediate alloy layer and a surface alloy layer from the inside layer by layer; alloy powder adopted by the transition alloy layer comprises, by mass, 0.21-0.31% of C, 3.2-3.6% of Si, 1.0-1.1% of B, 2.2-2.6% of Fe, 7-8% of Cr and the balance Ni; alloy powder adopted by the intermediate alloy layer comprises, by mass, 0.4-0.5% of C, 3.8-4.3% of Si, 11.2-11.93% of B, 2.5-3.2% of Fe, 10-12% of Cr and the balance Ni; and alloy powder adopted by the surface alloy layer comprises, by mass, 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr, 27-30% of Mo and the balance Co. The hot roll repaired by the laser repairing method of the hot roll good in laser cladding effect has good abrasion resistance, corrosion resistance and hot hardness in surface, integrates toughness and strength inside, and is good in laser cladding effect.

The invention discloses a highly stable and friction-resistant train brake disc. The raw materials and proportions thereof are as follows: C: 0.10-0.22%; Ti: 0.21-0.31%; Mn: 0.37-1.21%; V: 0.05-0.15%; Cr: 1.46~3.77%; W: 0.34~1.77%; Mo: 0.65~0.98%; Cu: 0.50~0.80%; P: <0.005%; S: <0.005%; Nb: 2.01~3.78%; quantity. The invention also discloses a preparation method of a highly stable friction-resistant train brake disc. The brake disc of the present invention has low-temperature strength and toughness, and still maintains good friction coefficient stability under the temperature span of +20°C to -60°C, so the brake disc is suitable for long-distance and ambient temperature applications in the north-south region High-speed trains run between areas with large differences.

The invention discloses a turning tool machining process favorable for machining efficiency. The turning tool machining process comprises the following steps of discharging blank, forging, cutting machining, thermal treatment and grinding machining which are performed in sequence, wherein the blank is W2MoCr4V2Co8 high-speed tool steel; the thermal treatment comprises preheating, heating, preserving heat, quenching and tempering which are performed in sequence; the preheating is performed by heating gradually in stages; the quenching is oil cooling; the process can also comprise an annealing step between the steps of forging and cutting machining; in the annealing step, the forged blank is heated in steps. The process route is simple; the hardness value of the obtained turning tool can reach over 70 HRC; moreover, the turning tool has high wear resistance and thermal hardness.

The invention belongs to the field of wear-resistant materials, and particularly discloses a high-temperature gradient wear-resistant coating which comprises a bottom layer, a transition layer, a wear-resistant layer and a vulcanization layer formed by vulcanization on the surface of the wear-resistant layer. The bottom layer comprises a martensite matrix and an intermetallic compound dispersed in the martensite matrix; each of the transition layer and the wear-resistant layer comprises a martensite matrix as well as an intermetallic compound and a carbide which are dispersed and distributed in the martensite matrix; wherein the content of intermetallic compounds in the transition layer and the wear-resistant layer is greater than the content of intermetallic compounds in the bottom layer; and the content of carbide in the wear-resistant layer is greater than that in the transition layer. The invention further comprises preparation and application of the coating, a wear-resistant material with the coating and preparation of the wear-resistant material. The research finds that the intermetallic compound and carbide double-gradient controlled hierarchical coating has excellent synergism, and the high-temperature (such as 700 DEG C) wear resistance of the coating can be remarkably improved.

The invention discloses a heat treatment method for steel. The heat treatment method includes the steps that the steel is heated to 860 DEG C to 880 DEG C, the temperature is kept for 1 hour to 2 hours, and the steel is taken out from a furnace after being subjected to isothermal annealing and general annealing; then the obtained steel is preheated twice, the temperature rises to 1,220 DEG C to 1,280 DEG C and is kept for 0.5 hour to 1 hour, and quenching is conducted; and tempering is conducted immediately after quenching, and tempering is conducted for three times. The steel treated through the heat treatment method is suitable for manufacturing tools; and due to the fact that the steel has good heat hardness and wear resistance and higher strength and toughness, the tools with the high cutting speed can be manufactured, and the cutting tools which can bear the large load and are complex in shape can be manufactured as well.

The invention discloses a heat-treated vanadium-containing high-boron high-speed steel and a heat treatment method thereof. According to the heat treatment method, quenching treatment is conducted on the vanadium-containing high-boron high-speed steel at the temperature of 1010-1060 DEG C to obtain a quenched part; and the quenched part is subjected to tempering treatment twice, and after the part is subjected to air cooling to the room temperature, the heat-treated vanadium-containing high-boron high-speed steel is obtained. According to the vanadium-containing high-boron high-speed steel and the preparation method thereof, the form of boron carbide is improved through vanadium addition and a heat treatment process, matrix strengthening is promoted, the vanadium-containing high-boron high-speed steel with excellent strength and toughness is obtained, and the vanadium-containing high-boron high-speed steel subjected to heat treatment can be better adapted to severe working conditions when being applied to actual production.

The invention relates to a hot roller laser restoration method allowing a restored surface to have good wear resistance. A transition alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of a hot roller. Alloy powder adopted by the transition alloy layer includes components by mass: 0.31-0.35% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5 % of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.2-3.6% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

The invention discloses a dry-point silicon nitride electric heating element and a manufacturing method. The dry-point silicon nitride electric heating element consists of a heating source and a heating body. The heating body comprises the following components: by weight percentage, 85-96% of nanometer silicon nitride, 1-4% of aluminum oxide and 4-8% of yttria, and is formed by preparing the components, making biscuit and sintering and the like. The dry-point silicon nitride electric heating element is resistant to high temperature and corrosion and excellent in thermohardening and wear resistance and can work for long time at the temperature within 1200 DEG C.

The invention relates to a wrapping cloth storage and transportation trolley and a maintenance method thereof. The wrapping cloth storage and transportation trolley comprises an underframe, a trolley body arranged on the underframe, a push handle arranged on the rear side of the trolley body, a plurality of wrapping cloth pipes which are arranged on the trolley body and distributed in a stepped mode, wrapping cloth clamps arranged at the tail ends of the wrapping cloth pipes, and trundles which are arranged at the four ends of the underframe and provided with brakes. The tail ends of every two adjacent wrapping cloth pipes are connected through an inverted L-shaped connecting support. The wrapping cloth pipes are distributed in the stepped mode, so that aired wrapping cloth receives sunshine by a larger area, ventilation is facilitated, and the airing effect is remarkably improved. The wrapping cloth pipes are square pipes so that the wrapping cloth pipes and the wrapping cloth clamps can be matched more firmly and reliably. The trundles are arranged at the four ends, and thus transportation of the wrapping cloth is facilitated. The surfaces of the underframe, the trolley body, the push handle, fence assemblies, the wrapping cloth pipes, a lower transverse bracket and the inverted L-shaped connecting supports are coated with Teflon coatings, so that firmness and durability are achieved, dust is not liable to adhere to the surfaces, and cleaning and disinfection are easy.

The invention provides a machining method of a rotor root blade locking window provided with threads, and relates to the field of steam turbines. By adoption of the machining method, the problems that according to an existing rotor root blade locking window provided with threads, due to the fact that a mounting window is a rhombic window, two parts of semi-sectioned threads need to be machined on the blade locking window, and the structure is complex; and in the machining process, the machining difficulty is high, the precision is low, the machining time is long, and the efficiency is low are solved. The machining method of the rotor root blade locking window provided with the threads comprises the steps that firstly, a rotor is mounted and aligned; secondly, the contour of the T-shaped root blade locking window of the rotor is roughly machined through a first vertical milling tool; thirdly, the T-shaped root blade locking window of the rotor is fine machined through a second vertical milling tool; fourthly, bottom holes of T-shaped root blade half-thread holes of the rotor are machined through a third vertical milling tool; fifthly, the bottom relief part of the T-shaped root blade locking window of the rotor is machined through a fourth milling tool; and sixthly, half-thread holes of the T-shaped root blade locking window of the rotor are machined through a thread milling tool. The machining method is used for machining the rotor root blade locking window provided with the threads.

The invention discloses a medical wrapping cloth trolley. The medical wrapping cloth trolley comprises a trolley frame and a push handle arranged on the rear side of the trolley frame. A set of square wrapping cloth pipes is arranged on the trolley frame in parallel. The wrapping cloth pipes are each provided with a wrapping cloth clamp. An underframe is arranged on the lower portion of the trolley frame, fence assemblies are arranged on the underframe, and a set of trundles with pedal brakes is arranged at the four ends of the underframe. A spring shock absorber is arranged inside each trundle. The top of each trundle is further provided with an anti-collision block. An upper transverse support and a lower transverse support are arranged close to the upper end and the lower end of the push hand correspondingly. The upper transverse support is provided with a pair of fixing block assemblies, and a supporting rod is arranged between the pair of fixing block assemblies. The wrapping cloth clamps are elastically arranged on the supporting rods through torsion springs, and the front ends of the wrapping cloth clamps are pressed on the wrapping cloth pipes. The medical wrapping cloth trolley is made of 304# stainless steel and is convenient to clean.

The invention discloses a gear cleaning device for a gear roller of a titanium sponge single roller crusher. The device mainly consists of the gear roller (1), a housing case (2) and a gear cleaning knife (3); the gear cleaning knife (3) is fixed at one side of the gear roller (1) of the crusher and is positioned oppositely to a jaw plate; a gap between the knife edge of the gear cleaning knife (3) and gear spaces of the gear roller (1) is adjustable; when the crusher is in work, the gear roller (1) rotates to squeeze with the jaw plate for cutting titanium sponge; and at the same time, the gear cleaning knife (3) picks out the titanium sponge on the gear roller (1), and the principle is similar to the process of metal-cutting. The gear cleaning device provided by the invention has the technical effects that no additional power source or transmission mechanism are needed, and a gear can be cleaned by utilizing the self-power of the crusher; the gear cleaning knife structure is of a combined type, so that the cost is low; gaps between gears can be adjusted according to a practical application situation, so that the capability of cleaning the gear is improved; the gear cleaning knife head is good in thermohardening property and high in strength; and the knife edge of the knife head is additionally provided with a rake angle and a relief angle, so that the force for cleaning the gear is reduced, and the friction is reduced.

The invention relates to a wear-resistant and abrasion-resistant and a preparation process for forming a protective coating on a working surface of a mould substrate. The wear-resistant and abrasion-resistant mould is provided with a substrate which is made of an iron-based material, and the working surface of the substrate is provided with a nanometer titanium aluminum nitrogen (TiAlN) coating which is prepared in a preset powder or synchronously-fed laser smelting and coating way and is combined with the working surface of the substrate in a metallurgical form. The preparation process for forming the protective coating on the working surface of the mould substrate comprises steps of: (1) pre-treating mould substrate; and (2) laser cladding. According to the wear-resistant and abrasion-resistant mould and the preparation process, the technical problems of the existing ion nitrogenization plus physical vapor deposition process for depositing a metal ceramic hard coating on a mould that a complicated surface or a large-size mould cannot be processed, the coating adhesion is required to further improve and the production equipment and production process are complicated can be solved.

A high-speed steel for high-strength and wear-resistant cutters is composed of, by weight, 1.2-1.6% of C, 0.55-0.85% of Si, 1.10-1.30% of Mn, 5.50-6.50% of Cr, 3.40-4.40% of Mo, 1.05-1.15% of V, 0.50-0.70% of Nb, 0.02-0.04% of Ti, 1.60-1.90% of W, 0.03-0.05% of Re, 0.0008-0.003% of B, 0.05-0.09% of N, P smaller than or equal to 0.015%, S smaller than or equal to 0.015% and the balance Fe and inevitable impurities. The high-speed steel is high in strength, good in wear resistance, thermal hardness and machinability and low in production cost.