Bushing press-fit bolt and press-fit method thereof
A bushing and press-fitting technology, applied in the field of auxiliary tooling, can solve the problems of poor surface fit, bushing scratches, low production efficiency, etc., to achieve good press-fit uniformity, uniform press-fit force, and press-fit The effect of high pass rate
Inactive Publication Date: 2015-12-30
CRRC NANJING PUZHEN CO LTD
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Problems solved by technology
[0002] At present, in the production of train bogies, the bushing in the workpiece to be pressed is mostly manually operated, which is inconvenient to operate, low in production efficiency, uneven in press-fitting, not closely bonded on the surface, and prone to scratches on the outer surface of the bushing. Injury, affect the assembly quality
[0003] In order to improve work efficiency and make the press-fit more uniform, our company designed a bushing press-fit bolt, but in use, it was found that the thread was easily damaged
In addition, the screw head is also easy to damage the pressure sleeve, resulting in a very low service life of the bolts and pressure sleeves, and a large number of bolts and pressure sleeves need to be produced for backup. On the one hand, the manufacturing cost is greatly increased and the press-fitting efficiency is low; on the other hand, The uniformity of the press-fitted workpiece needs to be improved
Method used
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[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.
[0036] The bushing press-fitting bolt of the present application is used to press-fit the bushing 3 into the press-fitting hole of the workpiece 4 to be press-fitted, and the center of the bushing 3 has a bushing hole.
[0037] Such as figure 1 As shown, a bushing press-fitting bolt includes a compression sleeve screw 1, a nut 6, two compression sleeves 2 and two flanges 5.
[0038] The compression sleeve screw 1 includes a screw head 11 and a screw shaft 12 . The thread on the compression sleeve screw 1 is preferably a trapezoidal thread, the design of the trapezoidal thread can make the thread of the compression sleeve screw 1 not easy to be damaged, and make the whole pressing process have good alignment.
[0039] The two pressure sleeves 2 are respectively a first pressure sleeve 21 and a second pressure sleeve 22 .
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The invention discloses a bushing press-fit bolt and a press-fit method thereof. The bushing press-fit bolt is used for press fitting bushings into pressing sleeve holes of workpieces to be pressed and sleeved, and the center of each bushing is provided with a bushing hole. The bushing press-fit bolt comprises a pressing sleeve screw, a nut, two pressing sleeves and two flange discs; the pressing sleeve screw comprises a screw head and a screw rod, the two pressing sleeves comprise a first pressing sleeve and a second pressing sleeve, and the two flange discs comprise a head flange and a tail flange; the head flange, the first pressing sleeve, the second pressing sleeve, the tail flange and the nut are sequentially and coaxially installed on the screw rod from the screw head in a sleeving mode, and the outer diameter of each flange disc is larger than that of each pressing sleeve. By means of the structure and method, two bushings can be simultaneously press fit through one-time press-fit, the abrasive resistance of the press-fit bolt is good, the pressing sleeves and threads are all not prone to damage, the service life is long, the press-fit yield is high, the press-fit uniformity and centering performance are good, and the manufacturing cost is low.
Description
technical field [0001] The invention relates to an auxiliary tooling in bogie production, in particular to a liner press-fitting bolt. Background technique [0002] At present, in the production of train bogies, the bushing in the workpiece to be pressed is mostly manually operated, which is inconvenient to operate, low in production efficiency, uneven in press-fitting, not closely bonded on the surface, and prone to scratches on the outer surface of the bushing. Injury, affect the assembly quality. [0003] In order to improve work efficiency and make the press-fit more uniform, our company designed a bushing press-fit bolt, but in use, it was found that the thread was easily damaged. In addition, the screw head is also easy to damage the pressure sleeve, resulting in a very low service life of the bolts and pressure sleeves, and a large number of bolts and pressure sleeves need to be produced for backup. On the one hand, the manufacturing cost is greatly increased and the...
Claims
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IPC IPC(8): B25B27/02
CPCB25B27/023
Inventor 张龙波张启磊颜子乔
Owner CRRC NANJING PUZHEN CO LTD
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