Bevel gear with inner hole having symmetrical inner round head flat keyway structure and precision forging process as well as mould punch thereof
A kind of gear precision and bevel gear technology, applied in the direction of toothed components, belts/chains/gears, manufacturing tools, etc., can solve the problems of difficult to ensure accurate symmetry, insufficient strength and precision, and shrinkage of bevel gears in cutting processing. , to achieve the effect of improving the connection accuracy, improving the strength and accuracy, and increasing the contact surface
Active Publication Date: 2014-08-27
盐城大丰创一精锻齿轮有限公司
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Problems solved by technology
Since the bevel gear 1 and the vertical shaft inserted into the inner hole 2 are fixed by a cylindrical pin, the connection between the cylindrical pin and the flat keyway 3 is a connection between a circular arc surface and a plane, which can only be a line contact, and it is difficult to ensure two A flat key keyway 3 is precisely symmetrical to the axis of the inner hole 2
This is not good for the gear to drive the vertical shaft to rotate
At the same time, the bevel gear products formed by the casting method have defects such as shrinkage porosity and pores, and the strength and precision are obviously insufficient, and sometimes broken teeth occur
Method used
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[0020] The inner hole of the bevel gear 1 has a symmetrical inner round head flat key groove structure. The inner hole 2 of the bevel gear 1 has two flat key grooves 3. The flat key groove 3 does not penetrate the inner hole 2. The size and shape of the two flat key grooves 3 All are the same, and relative to the inner hole 2, the axis is symmetrical, and the symmetry value is less than 0.2 millimeters. The groove bottom of the flat key groove 3 is a semi-cylindrical arc surface.
[0021] The process flow of precision forging the above-mentioned bevel gear 1 with a symmetrical inner round head flat keyway structure is as follows: blanking→outer round billet making→medium frequency heating→preforming→rough forming→shot blasting→medium frequency heating→finish forming→cutting Processing → carburizing and quenching heat treatment.
[0022] The specific process steps are:
[0023] 1. Cutting, according to 120% of the actual weight of the product;
[0024] 2. Turn the outer circl...
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Abstract
The invention provides a bevel gear with an inner hole having a symmetrical inner round head flat keyway structure, and a precision forging process of the bevel gear as well as a mould punch of the bevel gear, relates to a metal product and a preparation method of the metal product, in particular to the bevel gear and the precision forging process as well as the mould of the bevel gear. The inner hole of the bevel gear is provided with two flat key keyways, the flat key keyways do not penetrate through the inner hole and are symmetrical relative to an axis of the inner hole, and the keyway bottom of the flat key keyways is a semi-cylindrical cambered surface. The precision forging process flow comprises the following steps: baiting; truning sheet stamping; intermediate frequency heating; preforming; coarse forming; shot blasting; intermediate frequency heating; precision forming; machining; and carburizing quenching heat processing. A forming part of the top end of the precision forging mould punch is conjoined-arranged, and is heaved with a shape of a capital Greek letter phi. The bevel gear, the precision forging process and the mould punch disclosed by the invention have the advantages that the strength and the precision of the product per se are improved, the connection strength and the connection precision of the product are improved, and the productivity is increased.
Description
technical field [0001] The invention relates to a metal product and its preparation method, in particular to a bevel gear, its precise forging method and its mold. Background technique [0002] The outriggers of the semi-trailer must support more than 100 tons of the car box and goods, and the lifting of the outriggers is completed by a set of transmission gears. Therefore, the design strength requirements of each gear in the transmission gear set are very high. As attached to the manual figure 1 The bevel gear 1 shown in is a gear in the transmission gear set, and the inner hole 2 of the bevel gear 1 has two flat key slots 3 . The flat key groove 3 does not pass through the inner hole 2 . The size and shape of the two flat key slots 3 are the same, and are symmetrical with respect to the inner hole 2 axis. The traditional processing method of this product is obtained by cutting after casting, that is, the inner hole 2 is turned by turning after casting, and then the flat...
Claims
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IPC IPC(8): F16H55/17B23P15/14B21J5/02B21J13/02
Inventor 吴玉平陈雪锋聂相宜
Owner 盐城大丰创一精锻齿轮有限公司