Gear ring blank for automobile synchronizer and method for processing same

A synchronizer and ring gear technology is applied in the field of automobile synchronizer ring gear blanks and their processing fields, which can solve problems such as affecting the accuracy and service life of machine tools, affecting the performance of finished parts, and damage to the surface finish of tools, and reducing hole reaming. ratio, increase the service life, and reduce the effect of cutting processing

Inactive Publication Date: 2007-05-16
CHONGQING CHANGFENG PRECISE BLANK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the ring gear blank, the excessive difference in outer circle and wall thickness will directly affect the machining quality, especially when turning the outer circle and inner hole, it is easy to cause machining defects such as tool damage and excessive surface finish of the part, which directly affects The performance of finished parts also affects the accuracy and service life of the machine tool itself
[0007] (3). Using traditional steel pipes as raw materials must be cut with a sawing

Method used

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  • Gear ring blank for automobile synchronizer and method for processing same

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1, as shown in Figure 1, when using round steel 20CrMnTi as the blank processing the automobile synchronizer ring gear blank of Φ100mmXΦ78mmX52mm specification, carry out as follows:

[0033] a, blanking, calculate its net weight according to the size of the finished ring gear blank, that is, net weight = density x volume = 7.85 x 3.14 x 0.052 x (50 x 50-39 x 39) = 1255 grams, in the net weight of 1255 grams On the basis of adding fire consumption 5% that is 62.75 grams, plus punching and skin consumption of 72.25 grams, the weight of the blanking material is determined to be 1390 grams, and the diameter of the round steel of 50 mm is selected, and the length of the blanking material is calculated to be 90 mm. Material length / round steel diameter=90 / 50=1.8<2.5, the round steel diameter and blanking length meet the requirements, and the round steel with a diameter of 50mm is cut into a 90mm long blank with a CQ65 type rod shearing machine.

[0034] b. Heating,...

Embodiment 2

[0043] Embodiment 2, as shown in Figure 1, with round steel 20CrMnTi as blank, when processing the automobile synchronizer ring gear blank of Φ85mmXΦ65mmX52mm specification, carry out as follows:

[0044] a, blanking, calculate its net weight according to the size of the finished ring gear blank, that is, net weight = density × volume = 7.85 × 3.14 × 0.052 × (42.5 × 42.5-32.5 × 32.5) = 961 grams, in the net weight of 961 grams On the basis of adding fire consumption 3% that is 29 grams, plus punching and skin consumption of 75 grams, the weight of the blanking is determined to be 1065 grams, the diameter of the round steel is 50mm, and the length of the blanking is calculated to be 54mm. Material length / round steel diameter=54 / 50=1.08<2.5, the round steel diameter and blanking length meet the requirements, and the round steel with a diameter of 50mm is cut into a 54mm long blank with a CQ65 type rod shearing machine.

[0045] b. Heating, put the billet into a low-pressure gas ...

Embodiment 3

[0054] Embodiment 3, as shown in Figure 1, with round steel 20CrMo as blank, when processing the automobile synchronizer ring gear blank of Φ75mmXΦ50mmX52mm specification, carry out as follows:

[0055] a, blanking, calculate its net weight according to the size of the finished ring gear blank, that is, net weight = density × volume = 7.85 × 3.14 × 0.052 × (37.5 × 37.5-25 × 25) = 1001 grams, in the net weight of 1001 grams On the basis of adding fire consumption 4% that is 40 grams, plus punching and skin consumption of 70 grams, the weight of the blanking is determined to be 1111 grams, the diameter of the round steel is 50mm, and the length of the blanking is calculated to be 57mm. Material length / round steel diameter=57 / 50=1.14<2.5, the round steel diameter and blanking length meet the requirements, and the round steel with a diameter of 50mm is cut into a 57mm long blank with a CQ65 type rod shearing machine.

[0056] b. Heating, put the billet into a low-pressure gas furn...

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Abstract

The processing method for a round bar blank into a synchronizer geared ring blank for vehicles are like this: feeding, heating, descaling, metal gathering, punching, discharging end face, extending molding and trimming to make the round bar into a geared ring blank with 50-78 mm diameter, 10-15 wall thickness, 45-60 mm in height. By applying rolling ring processing technique in the process, it greatly reduces the manufacturing cost, improves precision, bettering the heat treatment performance of finished parts, reducing subsequent processing quantity, with improved productivity and lengthened durability of the finished geared ring. After several times road test, compared with traditional manufacturing method, this synchronizer can lengthen durability by 30%, reduce cost 15%, and improve productivity 10%.

Description

technical field [0001] The invention belongs to the technical field of automobile synchronizers, and in particular relates to an automobile synchronizer ring gear blank and a processing method thereof. Background technique [0002] The automobile synchronizer ring gear is one of the important parts in the automobile transmission mechanism. Its processing quality, structure and service life directly affect the normal driving of the automobile and the personal safety of the drivers and passengers. my country's automobile industry started late, and its blank forging processing technology is relatively backward. For hollow thin-walled ring gear blanks such as synchronizer rings, it is difficult to meet the blank size requirements by using traditional forging methods. In actual production, only Steel pipes can be used as raw materials. [0003] The traditional hole reaming and rolling technology of ring parts uses bar as the blank. The mold manufacturing is complex, the service l...

Claims

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Application Information

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IPC IPC(8): F16H55/02B21K1/30B21J1/06B21J1/00B23P23/04C21D9/32C21D11/00
Inventor 罗勇陈伟
Owner CHONGQING CHANGFENG PRECISE BLANK
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