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Manufacturing process of high-stress suspension spring

A suspension spring and manufacturing process technology, which is applied to the manufacturing process field of high-stress suspension springs, can solve the problems that the spring production process cannot meet the spring stress level and the spring production is difficult, so as to improve the stability and fatigue life, and avoid stress. concentrated effect

Inactive Publication Date: 2015-06-10
SHANGHAI SPRING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing spring production process cannot meet the increasing stress level of the spring, and to provide a high-stress suspension spring manufacturing process
The present invention improves the fatigue strength of the spring by precisely controlling the shape of the spring, combined with hot pressing, hot shot blasting and stress shot blasting, and solves the problem of difficult production of high-stress suspension springs in the past

Method used

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  • Manufacturing process of high-stress suspension spring
  • Manufacturing process of high-stress suspension spring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Through the shape comparison technology, debug the coil spring program, so that the coiled spring shape is consistent with the designed shape. After the program is debugged in place, the spring is rolled, and the sample is checked periodically to see if it still meets the shape requirements. The finished spring after rolling is sent into the tempering furnace by a conveyor belt for stress relief annealing. The tempering furnace in this embodiment is divided into six zones, with zones 1 to 4 being tempering zones, zone 5 being a transition zone, and zone 6 being a constant temperature zone. Among them: the temperature of the first zone is controlled at about 300-380°C, the temperature of the second zone to the fourth zone is controlled at 380-395°C, the temperature of the fifth zone is controlled at about 200-280°C, and the temperature of the sixth zone is controlled at about 200-285°C. The tempering time was 60 minutes. The springs from the constant temperature zone ar...

Embodiment 2

[0031] Through the shape comparison technology, debug the coil spring program, so that the coiled spring shape is consistent with the designed shape. After the program is debugged in place, the spring is rolled, and the sample is checked periodically to see if it still meets the shape requirements. The rolled spring is sent to the tempering furnace through the conveyor belt for stress relief annealing. The tempering furnace is divided into four zones. The temperature is controlled at about 300-350°C, the fourth zone is a constant temperature zone, and the temperature is controlled at about 300-350°C; the tempering time is 30 minutes. The springs from the constant temperature zone are exported through the conveyor belt, and placed on the Morita hot pressing equipment by the manipulator for hot pressing. The temperature during hot pressing is between 220 and 300°C, and the compression height is about 1 / 3 of the original length of the spring (the exact compression height Accordi...

Embodiment 3

[0033]Through the shape comparison technology, debug the coil spring program, so that the coiled spring shape is consistent with the designed shape. After the program is debugged in place, the spring is rolled, and the sample is checked periodically to see if it still meets the shape requirements. The rolled spring is sent to the tempering furnace through the conveyor belt for stress relief annealing. The tempering furnace is divided into five zones. It is the transition zone, the temperature is controlled at about 200-250°C, the fifth zone is the constant temperature zone, the temperature is controlled at about 200-250°C; the tempering time is 90 minutes. The springs from the constant temperature zone are exported through the conveyor belt, and placed on the Morita hot-pressing equipment by the manipulator for hot-pressing. The temperature during hot-pressing is between 170 and 230°C, and the compression height is about 1 / 4 of the original length of the spring (accurate compr...

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Abstract

The invention discloses a manufacturing process of a high-stress suspension spring. The manufacturing process performs the following steps in sequence: a precise spring coiling step: a primary finished product of the high-stress suspension spring is formed; a tempering destressing step: the tempering destressing annealing is performed for the primary finished product produced by precise spring coiling equipment; a constant temperature step: the constant temperature treatment is performed for the destressed primary finished product; a thermal pressing step: the primary finished product is thermally compressed after the constant temperature treatment under a heating condition; a thermal shot blasting step: the shot blasting is performed for the thermally pressed primary finished product; a stress shot blasting step: the stress shot blasting is performed for the primary finished product after the thermal shot blasting at a normal temperature to form a semi-finished product; and a surface treatment step is performed for the semi-finished product after the stress shot blasting to form a spring finished product. The process controls the whole shape of the spring in the spring coiling to guarantee the uniformity of the spring stress distribution, and adopts such steps as the thermal pressing, the thermal shot blasting and the stress shot blasting to largely improve the spring fatigue strength and the load stability under high stress so as to achieve the purpose of large-batch production of the high-stress suspension spring.

Description

technical field [0001] The invention belongs to the field of manufacturing, in particular to a manufacturing process of a high-stress suspension spring. Background technique [0002] With the advancement of automobile lightweight, the stress level of auto parts is getting higher and higher. Taking the suspension spring as an example, due to the design and application of light weight and high stress, the quality of the suspension spring has decreased by about 25% in the past 20 years, and the stress level of the domestic automobile suspension spring has increased from the original 1000MPa to above 1100MPa , the highest is close to 1200MPa. However, 1200MPa is not the limit of spring lightweight design. On Volkswagen's upcoming car platform MQB, the maximum design stress value of suspension springs has exceeded 1300MPa. At present, domestic spring enterprises mainly adopt conventional shot blasting and cold pressing, and the stress level of springs that can be manufactured i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00C21D9/02
CPCB23P15/00C21D9/02
Inventor 金方杰
Owner SHANGHAI SPRING CORP
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