Diameter reducing device and method for non-uniform-thickness rubber ball joints

Abstract

Non-equal-thickness rubber ball joint diameter reduction device and method, including a base that supports the ball joint vertically, a chuck valve mold assembly that is placed on the base and can surround the ball joint in a circumferential direction, and is used for aligning the chuck valve mold assembly The middle mold that exerts radial pressure and the upper module used to drive the middle mold up and down. The middle mold is set on the chuck valve mold assembly and cooperates with the tapered surface of the chuck valve mold assembly. The chuck valve mold assembly follows the middle mold The ball hinge is radially compressed by the downward movement of the ball joint, and the chuck valve mold assembly is composed of multiple valve molds spliced ​​in sequence along the circumferential direction. In the case of a real valve mold that performs radial compression in the real direction, the radial compression amount of the ball joint rubber layer by the empty valve mold is smaller than the radial compression volume of the ball joint rubber layer by the real valve mold. After the diameter is reduced, the invention can compensate the dimensional deviation caused by the difference in rubber rebound in the empty and solid directions, reduce the difference in diameter reduction between the empty and solid directions of the ball joint, improve the cylindricity of the ball joint after diameter reduction, and improve the reliability of diameter reduction and accuracy, the practicability of the reducing device is higher.

Description

technical field [0001] The invention relates to a non-uniform-thickness rubber ball joint diameter reduction device and method, which are used for the diameter reduction of non-uniform-thickness rubber ball joints. Background technique [0002] The non-equal thickness rubber spherical joint structure with hollow solid structure is shown in the attached Figure 1~2 As shown, it is composed of a metal jacket, a metal mandrel, and rubber. The rubber layer between the jacket and the mandrel is designed with a hole structure, and the holes are distributed symmetrically at 180°. The side with holes is called the empty direction, and the side without holes The opening side is called the solid direction. After vulcanization and molding, the rubber cools and shrinks, the rubber is firmly bonded to the jacket and the mandrel, and there is no space for the rubber to shrink, resulting in tensile stress between the molecules. During the working process of the ball joint, it is affected ...

AI Technical Summary

Problems solved by technology

[0004] (1) For example, "Application Research of Radial Reduction Process in Ball Joint of Oil Pressure Shock Absorber" (MN61-1141 / TQ), "Development and Development of Ball Joint Reduction Machine" (11-1812 / TQ); "An Automobile Swing Arm Bushing Reducing Tooling" (MN201822049808.5), "Leaf Spring Back Bushing The problem of the tight reduction is that the working part of the reduction mold is a circular inner hole. For the structural ball joint discussed in the present invention, due to the spherical joint, the rubber layer has a partially hollowed out structure, and after the diameter is reduced, the hollow direction and The actual size deviation is very large, resulting in unqualified cylindricity of the outer surface of the product

[0005] (2) The radial precompression method described in "A Combined Radial Precompression Die for Rubber Bushing" (MN201420571594.7) belongs to the axial extrusion type diameter reduction of workpiece movement. The problem is that the lower mold is divided into The upper block and the lower block have a two-layer structure. The working area is distributed on the upper block. The length of the working area is relatively short. After extrusion, there will be a large diameter deviation at different positions in the height direction of the product. The assembly area and the working area are both circular holes, and the transition The area is a tapered hole. When the diameter reduction exceeds 2mm, the taper hole in the transition area has a large step, and the product jacket will be scratched after extrusion. At the same time, the structure in the patent cannot realize automatic operation, and the production efficiency is low.

[0006] (3) The radial pre-compression method described in "Rubber Bushing Squeeze Die" (MN201010133169.6) belongs to the axial extrusion type diameter reduction of workpiece movement. Products with large diameter reduction need to be divided into multiple times, the operation is cumbersome, and the cost of tooling is high

[0007] It is the research and development purpose of the present invention to solve the technical problem that there is a large deviation between the space and the real dimension after the diameter is reduced, which leads to the unqualified cylindricity of the product's outer circle

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