Spring part forming process analysis and mold design

Spring part forming process analysis and mold design Xi'an North Optoelectronics Co., Ltd. Xi'an 710043 Shi Huiling designed the wedge-shaped forming die and coil spring auxiliary tool, which effectively solved the stamping and forming of the high-hardness wide-band material special spring.

1 Introduction In production practice, mass-produced spring parts are usually completed on dedicated reed spring equipment. For the spring part of 1, the material is a special cobalt-chromium alloy spring steel strip with a hardness of 45. For this shape, the special plane eccentric spring parts are also difficult to form on the reed device. For similar parts, Russia is finished with special equipment. The parts are analyzed by process characteristics, and from the perspective of economic and safety production, it is considered advantageous to use existing stamping equipment to complete the forming of parts.

2 Process analysis of chrome alloy spring steel strip, hardness 45 穸 hot pick. The size of the 72 parts is 1250x22mm. 2. The characteristics of the parts are high hardness, large elasticity and difficult to form. Several surfaces constituting the spring are not concentric and difficult to process. The precision of the formed parts is difficult to guarantee; and the requirements in the range of +28mm are smooth. No wrinkles and scratches; a portion other than +28 is a small 85mm circle, the centers of the two circles do not coincide and require a smooth transition. From the technical analysis of the parts, the method of sub-bending forming of the stamping parts is not feasible. It is necessary to form the umbrellas 28 and 4851, respectively, and to ensure the position requirements of the two circles.

According to the characteristics of the part, the process plan is as follows: the formed insert is placed in the lower mold, and the upper mold is descended with the punch slider. The upper mold first contacts the two swing arms, and the swing arm drives the insert blank to rotate downward, and then turns to the lower die. The point is formed. The punch slider is ascending, the material returning rod will be formed. 4 The main part of the mold is designed. 4.1 The upper mold is designed with 12 materials and heat treatment 6062. Since the contact surface between the upper mold and the swing arm is subjected to friction, the upper mold surface is required. Smooth and wear resistant.

4.2 Swing arm design The swing arm adopts Crl2MoV material, heat treatment 5860HRC, the swing arm is completed by wire cutting, and the shape of the swing arm is 4, it should be noted that the swing arm should be as long as possible, and the force is good. Small, otherwise the rotating shaft is easy to cut, and the contact surface with the upper mold is required to be smooth.

5 Conclusion The bending die structure is reasonable, which can guarantee the size and mass production requirements, and has a reference application value for manufacturers producing similar products.

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Punching the corners and punching the ends, respectively, to complete the required hole dimensions on the paper.

Curved 428 round, designed with a double wedge die.

With the positioning of +28,1 circle and rectangular hole, the design of the manual winding spring auxiliary tool completes the shape and technical requirements of the small 851.

3 mold structure design According to the shape and size requirements of the parts, the sub-wedge type horizontal punching mold is designed, 3 parts.

The working process of the mold is as the punch slider descends, the inclined surface of the wedge 4 pushes the movable die 8 to the left, and the part is formed after the punch 2 is clamped; when the punch slider is up, the movable die is Under the action of the spring 6, it returns to the original position. In this way, after 45 repeated movements, the part circle +28 of the part is gradually and continuously impact-formed, and finally the paper requirement is reached.

4 Note The movement stroke of the movable die 8 and the distance of the punch 2 and the slope of the wedge 4 are subjected to rigorous calculation to achieve the coincidence of the punch and the movable die when the mold is closed.

In the stamping process, since the punch 2 is subjected to the unidirectional impact force, a hole which is formed with the gap between the upper portion of the punch and the gap is formed on the fixing plate 3 so as to increase the rigidity of the punch when the mold is closed. At the same time, in order to increase the wear resistance of the fixed plate guide hole, the fixed plate needs to be quenched. Due to the high hardness of the material and the large rebound coefficient, the theoretically calculated convex and concave die forming size can not meet the size requirements of the part, and it is necessary to repeatedly test. Determine the size.

The inspection of the formed part is to mark the position of the part on the metal plate, and check whether 485, 1 is within the tolerance zone, otherwise the manual is slightly shaped to meet the paper requirement.

1. Fixing plate 2. Punch 3. Fixing plate 4. Oblique wedge 5. Fixing block 6. Screw 7. Spring 8. Movable die 9. Screw 1 pin 5 Conclusion Wedge die and manual coil spring auxiliary tool The method of forming special spring parts is feasible. The parts have achieved the expected results in mass production for many years, and the parts pass rate has reached 98 or more. The use of wedge-bending molds to produce spring-loaded parts and methods similar to spring-type parts has opened up new ideas for mold design, providing a reference for similar mold designs or part forming.

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