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Multi-station forming technology for driven pulley piston of CVT

A forming process and multi-station technology, applied to pistons, metal processing equipment, etc., to achieve the effect of ensuring fluidity

Active Publication Date: 2019-07-23
柳州市龙杰汽车配件有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a CVT transmission driven pulley piston multi-station forming process suitable for CVT transmission pulley piston forming to solve the problems of high material loss, complex processing and heavy weight in the prior art , unable to meet the lightweight requirements

Method used

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  • Multi-station forming technology for driven pulley piston of CVT
  • Multi-station forming technology for driven pulley piston of CVT
  • Multi-station forming technology for driven pulley piston of CVT

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] A multi-station forming process for a driven pulley piston of a CVT transmission, comprising the steps of S1. shearing, S2. blanking, S3. deep drawing, S4. upsetting, and S5. shaping, wherein:

[0082] S1. Shearing plate: The raw material of the shearing plate is high-strength steel plate with a thickness of 5.5mm. The material is high-strength automotive structural steel, such as SPFH590. Deep drawing can be completed without annealing.

[0083] S2. Blanking;

[0084] S3. Deep drawing: the drawing coefficient is 0.65; this step S3. Deep drawing includes the following procedures:

[0085] S31. Drawing inner hole:

[0086] Deepen the inner hole of the blanking blank 101 multiple times to form a hat-shaped blank 102 with a central hole, and the height of the central hole is H1=47mm;

[0087] S32. Deep drawing outer circle:

[0088] The cap-shaped blank 102 with a central hole is subjected to external circular drawing to obtain a one-stage inverted cup-shaped blank 103 ...

Embodiment 2

[0102] A multi-station forming process for a driven pulley piston of a CVT transmission, comprising the steps of S1. shearing, S2. blanking, S3. deep drawing, S4. upsetting, and S5. shaping, wherein:

[0103] S1. Shearing plate: The raw material of the shearing plate is high-strength steel plate with a thickness of 6.5mm. The material is high-strength automotive structural steel, such as SPFH780. Deep drawing can be completed without annealing.

[0104] S2. Blanking;

[0105] S3. Deep drawing: the drawing coefficient is 0.85; this step S3. Deep drawing includes the following procedures:

[0106] S31. Drawing inner hole:

[0107] Deepen the inner hole of the blanking blank 101 multiple times to form a hat-shaped blank 102 with a central hole, and the height of the central hole is H1=49mm;

[0108] S32. Deep drawing outer circle:

[0109] The cap-shaped blank 102 with a central hole is subjected to external circular drawing to obtain a one-stage inverted cup-shaped blank 103 ...

Embodiment 3

[0123] A multi-station forming process for a driven pulley piston of a CVT transmission, comprising the steps of S1. shearing, S2. blanking, S3. deep drawing, S4. upsetting, and S5. shaping, wherein:

[0124] S1. Shearing plate: the raw material of the shearing plate is high-strength steel plate with a thickness of 5.5-6.5mm, and the raw material is Cr alloy structural steel plate, such as 40Cr alloy structural steel plate, etc. For Cr alloy structural steel plate with higher yield strength requirements, spheroidizing annealing is required treatment to make the spherical pearlite structure of the steel plate reach more than 85%.

[0125] S2. Blanking;

[0126] S3. Deep drawing: the drawing coefficient is 0.75; this step S3. Deep drawing includes the following procedures:

[0127] S31. Drawing inner hole:

[0128] Deepen the inner hole of the blanking blank 101 multiple times to form a hat-shaped blank 102 with a central hole, and the height of the central hole is H1=48mm;

[...

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Abstract

The invention relates to a multi-station forming technology for a driven pulley piston of a CVT (Continuously Variable Transmission). The multi-station forming technology comprises the steps of S1, shearing a plate, S2, falling, S3, drawing, S4, upsetting and S5, shaping; in the step S1, a high-strength steel plate with a thickness of 5.5-6.5 mm is used as a raw material and subjected to spheroidizing annealing treatment; in the step S3, the drawing coefficient is 0.65-0.85; the step S3 comprises the following steps of S31, inner hole drawing, S32, outer circle drawing, and S33, step drawing;in the S31, a falling blank is subjected to inner hole drawing for many times to form a cap-shaped blank with a center hole; in the S32, the cap-shaped blank with the center hole is subjected to the outer circle drawing to obtain a first-stage stepped inverted cup-shaped blank; and in the S33, the outer circle of the top of a large-end barrel of the first-stage stepped inverted cup-shaped blank isdrawn to form a transition step to obtain a second-stage stepped inverted cup-shaped blank. The multi-station forming technology is suitable for the forming of the driven pulley piston of the CVT, has the characteristics of low material loss, simplicity in machining, reliable quality and light weight, and is easy to popularize and use.

Description

technical field [0001] The invention relates to a piston forming process, in particular to a multi-station forming process for a driven pulley piston of a CVT transmission. Background technique [0002] The CVT transmission is a continuously variable transmission with the characteristics of continuous transmission ratio and continuous and smooth power transmission. The active piston and the driven piston are the main pressure-bearing parts of the CVT transmission, which bear the surface pressure of high-pressure hydraulic oil and the contact pressure of the pulley. There are high requirements for the strength of parts. Since the active piston and the driven piston of the CVT transmission are cylindrical parts with complex structures, flanges and multiple steps, they are currently produced by forging + machining. However, this method has the following limitations: high material loss, complex processing, high weight, and cannot meet the lightweight requirements. [0003] App...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/18B21J5/08B21D22/26
CPCB21D22/26B21J5/002B21J5/08B21K1/18
Inventor 张良杰韦秀萍张博文张泉罗振
Owner 柳州市龙杰汽车配件有限责任公司
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