A blank and solid bushing necking tooling

Abstract

The present invention discloses a necking tool for hollow-solid bushings, which relates to the technical field of necking of automotive chassis bushings. The tooling body includes a plurality of extrusion blocks. The plurality of extrusion blocks are surrounded to form a barrel shape, and an ellipse is formed between the plurality of extrusion blocks. A lower oil groove is respectively opened at the bottom end of each extrusion block. Two first abutting blocks are slidably connected to the inner wall of the lower oil groove, and the two first abutting blocks extend to the outside of the extrusion block. A return spring is respectively fixedly connected to the side wall of each first abutting block; through the design of the side walls of the plurality of extrusion blocks, the inner wall of the barrel-shaped structure formed by the plurality of extrusion blocks is elliptical, so that the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, so that the bushing has a larger deformation space in the major diameter direction of the elliptical hole, thereby optimizing the dynamic performance of the suspension system. And compared with the circular cross-section, the bushing is easier to determine the installation direction during installation.

Description

Technical Field

[0001] The invention relates to the technical field of automobile chassis bushing shrinkage, in particular to a hollow solid bushing shrinkage tool. Background Art

[0002] Automotive bushing shrinking refers to improving the performance and durability of bushings through shrinking treatment. The shrinking treatment mainly compresses the outer jacket radially to make the rubber molecules have pre-existing compressive stress, so that they are not affected by tensile stress during operation, thereby improving the durability of the product. The shrinking treatment can make the bushing better withstand external loads during use and reduce internal cracks and early damage caused by excessive tensile stress. By adjusting the compression amount, the bushing can be free from tensile stress during operation, thereby improving its stability and durability. When shrinking the bushing, the bushing is placed inside the tooling and squeezed through the tooling, so that the outer wall diameter of the bushing is reduced, thereby squeezing the internal rubber.

[0003] However, the above technical solution still has certain defects. During use, the bushing needs to be reshaped after shrinking. In addition, there is a certain gap between the dovetail groove and the dovetail pin on the tooling during the shrinking process, which causes the tooling to shake during the shrinking process, resulting in displacement between the tooling and the bushing. For this reason, a hollow solid core bushing shrinking tooling is proposed. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a hollow solid core bushing shrinking tool to solve the technical problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hollow solid core bushing shrinking tool, comprising a tool body, the tool body comprising a plurality of extrusion blocks, the plurality of extrusion blocks are surrounded into a barrel shape, the plurality of extrusion blocks are elliptical, the bottom ends of each group of the extrusion blocks are respectively provided with a group of lower oil grooves, the inner walls of the lower oil grooves are slidably connected with two groups of first abutment blocks, the two groups of first abutment blocks extend to the outside of the extrusion blocks, the side walls of each group of the first abutment blocks are respectively fixedly connected with a group of return springs, the ends of the return springs are fixedly connected with the inner walls of the lower oil grooves, the inner walls of the lower oil grooves are connected with two groups of connecting pipes, the inner walls of each group of the extrusion blocks are provided with an upper oil groove near the top, the side walls of the extrusion blocks are provided with a dovetail groove, the upper oil groove is connected to the inside of the dovetail groove, the inner walls of the upper oil grooves are slidably connected with two groups of second abutment blocks, and the top ends of the connecting pipes are connected to the upper oil grooves;

[0006] The exterior of the tooling body is sleeved with a retracting mechanism, which includes a plurality of side panels, and the side walls of each group of side panels are respectively fixedly connected with a group of dovetail pins, and the dovetail pins are slidably sleeved on the inner walls of a group of dovetail grooves.

[0007] As a preferred technical solution, a set of upper sliders are respectively and slidably connected to the tops of each group of extrusion blocks. A curling plate is fixedly connected to the top of the upper slider. A upper hydraulic rod is fixedly connected to the side wall of the upper slider, and the end of the upper hydraulic rod is fixedly connected to the top of the extrusion block.

[0008] As a preferred technical solution, the bottom end of the upper hydraulic rod communicates with a connecting valve, and the bottom end of the connecting valve communicates with the inside of the upper oil groove.

[0009] As a preferred technical solution, a through hole is formed in the inner wall of the connecting valve. A sealing plate is slidably connected to the inside of the connecting valve. The sealing plate fits above the through hole. Two groups of pressure springs are fixedly connected to the top of the sealing plate, and the top ends of the pressure springs are fixedly connected to the inner wall of the connecting valve.

[0010] As a preferred technical solution, the contraction mechanism further includes an outer frame. The outer frame is slidably sleeved on the outer walls of multiple side plates. A guiding block is fixedly connected to the bottom end of the side plate, and multiple sliding grooves matching the guiding blocks are formed in the bottom end of the outer frame.

[0011] As a preferred technical solution, a set of hooks are respectively and fixedly connected to the bottom ends of multiple groups of guiding blocks. An elastic ring is sleeved on the outer walls of multiple groups of hooks, and the elastic ring is an elastic metal ring with an opening.

[0012] As a preferred technical solution, multiple groups of sliding rods are slidably sleeved on the side wall of the outer frame. A bottom plate is fixedly connected to the bottom ends of multiple groups of sliding rods. A lower hydraulic rod is fixedly sleeved on the inner wall of the bottom plate, and the top end of the lower hydraulic rod is fixedly connected to the bottom end of the outer frame.

[0013] As a preferred technical solution, a set of sliding rods are respectively and fixedly connected to the top ends of each group of sliding rods. A rotating arm is slidably sleeved on the outer wall of the sliding rod. A sliding groove is formed at the position where the rotating arm contacts the sliding rod, and a roller is rotatably connected to the end of the rotating arm.

[0014] To sum up, the present invention mainly has the following beneficial effects:

[0015] 1. By designing the side walls of multiple groups of extrusion blocks, the inner wall of the barrel-shaped structure formed by multiple groups is elliptical, so that when the bushing is extruded, the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, enabling the bushing to have a larger deformation space in the major diameter direction of the elliptical hole, thereby optimizing the dynamic performance of the suspension system. And compared with a circular cross-section, it is easier to determine the installation direction when installing the bushing;

[0016] 2. In the process of multiple groups of extrusion blocks approaching the center, the first abutting blocks on adjacent extrusion blocks contact and push against each other in an arc shape, so that the hydraulic oil inside the lower oil groove is pushed into the upper oil groove, causing the second abutting block to be pushed, so that the second abutting block tightly fits on the outer wall of the dovetail pin, and the excess hydraulic oil is discharged into the upper hydraulic rod, so that the curling plate fits against the upper edge of the bushing, thereby curling the upper edge of the bushing;

[0017] 3. The contraction and extension of the lower hydraulic rod drive the sliding rod in the present invention, thereby pushing the swing arm, so that the roller pushes the side plate to slide towards the center of the outer frame, so that the extrusion block extrudes the bushing, and through the elastic force of the elastic ring, when the roller does not push the side plate, the elastic ring rebounds to drive the side plate to reset, so that in the process of necking the bushing, the effect of fast and simple necking speed is achieved, and the processing efficiency is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the front view structural schematic diagram of the present invention;

[0019] Figure 2 is the front view structural schematic diagram of the contraction mechanism of the present invention;

[0020] Figure 3 is the structural schematic diagram of the swing arm of the present invention;

[0021] Figure 4 is the front view structural schematic diagram of the present invention;

[0022] Figure 5 is the structural schematic diagram of the present invention with the outer frame removed;

[0023] Figure 6 is the structural schematic diagram of the connection state between the side plate and the extrusion block of the present invention;

[0024] Figure 7 is the bottom cross-sectional structural schematic diagram of the extrusion block of the present invention;

[0025] Figure 8 is the top cross-sectional structural schematic diagram of the extrusion block of the present invention;

[0026] Figure 9 is the cross-sectional structural schematic diagram of the curling plate of the present invention;

[0027] Figure 10 is the internal structural schematic diagram of the connecting valve of the present invention.

[0028] In the figure: 1, the tooling main body; 2, the contraction mechanism;

[0029] 101. Extrusion block; 102. Lower oil groove; 103. First abutting block; 104. Return spring; 105. Connecting pipe; 106. Dovetail groove; 107. Second abutting block; 108. Upper oil groove; 109. Upper slider; 110. Flanging plate; 111. Upper hydraulic rod; 112. Connecting valve; 113. Through hole; 114. Sealing plate; 115. Pressure spring;

[0030] 201. Outer frame; 202. Slide rod; 203. Bottom plate; 204. Sliding rod; 205. Lower hydraulic rod; 206. Rotating arm; 207. Sliding groove; 208. Roller; 209. Side plate; 210. Dovetail pin; 211. Guide block; 212. Hook; 213. Elastic ring. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0032] Next, the embodiments of the present invention will be described according to the overall structure of the present invention.

[0033] An empty-solid core bushing necking tooling, as Figures 1 to 10 shown, includes a tooling main body 1. The tooling main body 1 includes multiple groups of extrusion blocks 101. The multiple groups of extrusion blocks 101 are arranged in a barrel shape in a surrounding manner, presenting an oval shape between the multiple groups of extrusion blocks 101. A group of lower oil grooves 102 are respectively opened at the bottom ends of each group of extrusion blocks 101. Two groups of first abutting blocks 103 are slidably connected to the inner walls of the lower oil grooves 102. The two groups of first abutting blocks 103 extend to the outside of the extrusion blocks 101. A group of return springs 104 are respectively fixedly connected to the side walls of each group of first abutting blocks 103. The ends of the return springs 104 are fixedly connected to the inner walls of the lower oil grooves 102. Two groups of connecting pipes 105 are communicated with the inner walls of the lower oil grooves 102. Upper oil grooves 108 are opened at the positions near the top ends of the inner walls of each group of extrusion blocks 101. Dovetail grooves 106 are opened on the side walls of the extrusion blocks 101. The upper oil grooves 108 are communicated to the inside of the dovetail grooves 106. Two groups of second abutting blocks 107 are slidably connected to the inner walls of the upper oil grooves 108. The top ends of the connecting pipes 105 are communicated to the upper oil grooves 108;

[0034] A contraction mechanism 2 is sleeved outside the tooling main body 1. The contraction mechanism 2 includes multiple groups of side plates 209. A group of dovetail pins 210 are respectively fixedly connected to the side walls of each group of side plates 209. The dovetail pins 210 are slidably sleeved on the inner walls of a group of dovetail grooves 106.

[0035] By placing the bushing between multiple groups of extrusion blocks 101, with multiple groups of extrusion blocks 101 surrounding the outside of the bushing, the contact positions between the multiple groups of extrusion blocks 101 and the bushing present an elliptical state. The multiple groups of extrusion blocks 101 move closer to the middle, causing the multiple groups of extrusion blocks 101 to extrude the outer wall of the bushing, so that the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, enabling the bushing to have a greater deformation space in the major diameter direction of the elliptical hole. Since the directions of the forces received by different components in the suspension system are different, through the above design, the bushing can be installed according to the main force directions of the components in the automotive chassis suspension system, thereby optimizing the dynamic performance of the suspension system. And compared with a circular cross-section, it is easier to determine the installation direction when installing the bushing. When using the tooling main body 1, by sleeving the dovetail grooves 106 on the multiple groups of extrusion blocks 101 on the outer wall of the dovetail pin 210, during the process of the multiple groups of extrusion blocks 101 approaching each other, the first abutting blocks 103 on two adjacent groups of extrusion blocks 101 push against each other, causing the first abutting blocks 103 to slide into the lower oil groove 102, thereby compressing the return spring 104 by the first abutting blocks 103 and pushing the hydraulic oil inside the lower oil groove 102 into the communication pipe 105, so that the hydraulic oil flows into the upper oil groove 108, causing the hydraulic oil to push the second abutting blocks 107 out of the upper oil groove 108, making the two second abutting blocks 107 clamp on the outer wall of the dovetail pin 210, so that the multiple groups of extrusion blocks 101 will not shake or displace during the extrusion process on the outer wall of the bushing, avoiding scratches on the surface of the bushing caused by friction between the extrusion blocks 101 and the surface of the bushing or unevenness of the bushing surface, and avoiding the problem that the gap between the dovetail groove 106 and the dovetail pin 210 affects the processing effect.

[0036] Please refer particularly to Figure 8 、 Figure 9 and Figure 10 ,For each group of extrusion blocks 101, a group of upper sliders 109 are respectively slidably connected to the top ends. A curling plate 110 is fixedly connected to the top ends of the upper sliders 109. A upper hydraulic rod 111 is fixedly connected to the side walls of the upper sliders 109. The end of the upper hydraulic rod 111 is fixedly connected to the top end of the extrusion block 101. The bottom end of the upper hydraulic rod 111 communicates with a communication valve 112. The bottom end of the communication valve 112 communicates with the inside of the upper oil groove 108. A through hole 113 is formed in the inner wall of the communication valve 112. A sealing plate 114 is slidably connected inside the communication valve 112. The sealing plate 114 fits above the through hole 113. Two pressure springs 115 are fixedly connected to the top end of the sealing plate 114. The top ends of the pressure springs 115 are fixedly connected to the inner wall of the communication valve 112.

[0037] During the operation of the above technical solution, when the hydraulic oil inside the lower oil tank 102 flows into the upper oil tank 108, part of the hydraulic oil flows into the inside of the connecting valve 112. However, due to the elastic force of the pressure spring 115, the sealing plate 114 blocks the through hole 113. Therefore, the hydraulic oil can only push the second abutting block 107 towards the dovetail pin 210 for fitting. But as multiple groups of first abutting blocks 103 are continuously pushed into the lower oil tank 102, the oil pressure inside the upper oil tank 108 continuously increases, causing the oil pressure to push the sealing plate 114 to slide upwards, thereby compressing the pressure spring 115. The upper hydraulic rod 111 is already filled with hydraulic oil inside. At this time, the pressure of the hydraulic oil is transmitted to the inside of the upper hydraulic rod 111, causing the upper hydraulic rod 111 to extend and push the flanging plate 110 to move. When the upper edge of the bushing contacts the flanging plate 110, it rolls inwards along the curvature of the flanging plate 110, thus achieving the effect of flanging the upper edge of the outer tube of the bushing.

[0038] Please refer specifically to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the contraction mechanism 2 further includes an outer frame 201. The outer frame 201 is slidably sleeved on the outer walls of multiple groups of side plates 209. The bottom ends of the side plates 209 are fixedly connected with guide blocks 211. Multiple groups of chutes that match the guide blocks 211 are opened at the bottom end of the outer frame 201. A set of hooks 212 are respectively fixedly connected to the bottom ends of multiple groups of guide blocks 211. Elastic rings 213 are sleeved on the outer walls of multiple groups of hooks 212. The elastic rings 213 are elastic metal rings with openings. Multiple groups of sliding rods 202 are slidably sleeved on the side walls of the outer frame 201. The bottom ends of multiple groups of sliding rods 202 are fixedly connected with a bottom plate 203. A lower hydraulic rod 205 is fixedly sleeved on the inner wall of the bottom plate 203. The top end of the lower hydraulic rod 205 is fixedly connected to the bottom end of the outer frame 201. A set of sliding rods 204 are respectively fixedly connected to the top ends of each group of sliding rods 202. A rotating arm 206 is slidably sleeved on the outer wall of the sliding rod 204. A sliding groove 207 is opened at the position where the rotating arm 206 contacts the sliding rod 204. A roller 208 is rotatably connected to the end of the rotating arm 206.

[0039] When necking is required, the lower hydraulic rod 205 contracts, causing the bottom plate 203 to move closer to the outer frame 201, so that the bottom plate 203 pushes up multiple sliding rods 202. During the upward sliding of the sliding rods, they push the sliding rod 204 upward, causing the sliding rod 204 to slide inside the sliding groove 207 and pushing the rotating arm 206 to flip. During the flipping of the rotating arm 206, the roller 208 is driven to flip, so that the roller 208 squeezes the side plate 209. At this time, multiple side plates 209 move closer to the middle simultaneously, causing multiple hooks 212 to move closer to the middle, thereby compressing the elastic ring 213. During the process of multiple side plates 209 moving closer to the middle simultaneously, multiple extrusion blocks 101 are driven towards the middle hole, so that the extrusion blocks 101 neck the bushing. After necking is completed, the lower hydraulic rod 205 extends, increasing the distance between the bottom plate 203 and the outer frame 201, causing the sliding rods 202 to descend. At this time, the roller 208 flips and resets in the reverse direction under the drive of the rotating arm 206, and the side plate 209 is no longer pushed by the roller 208. Therefore, under the resilience of the elastic ring 213, the hook 212 drives the guide block 211 to reset, and the guide block 211 drives the side plate 209 to reset, causing the side plate 209 to drive the extrusion block 101 to reset through the dovetail pin 210 and the dovetail groove 106. After the extrusion block 101 resets, the adjacent first abutting blocks 103 no longer push against each other. At this time, the resilience of the return spring 104 pushes the first abutting block 103 to reset, causing the hydraulic oil in the upper oil groove 108 to be drawn back into the lower oil groove 102, and a reset occurs inside the upper oil groove 108, so that the second abutting block 107 slides into the upper oil groove 108, and the elastic force of the pressure spring 115 pushes the sealing plate 114 to reset. At this time, the second abutting block 107 no longer clamps on the outer wall of the dovetail pin 210, making it possible to replace the extrusion block 101 conveniently.

[0040] During use, by designing the side walls of multiple extrusion blocks 101, the inner wall of the barrel-shaped structure formed by multiple extrusion blocks 101 is made elliptical, so that when the bushing is extruded, the outer metal sleeve and the internal rubber of the bushing are extruded into an elliptical cross-section, enabling the bushing to have a larger deformation space in the major diameter direction of the elliptical hole, thereby optimizing the dynamic performance of the suspension system. And compared with a circular cross-section, it is easier to determine the installation direction of the bushing during installation. The parts not involved in this device are the same as or can be implemented using the prior art.

[0041] Although the embodiments of the present invention have been shown and described, the specific embodiments are only explanations of the present invention and not limitations to the invention. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments according to their needs without departing from the principles and purposes of the present invention.

Claims

1. A necking tool for hollow and solid bushings, comprising a tooling body (1), characterized in that: The tooling main body (1) includes multiple groups of extrusion blocks (101). The multiple groups of extrusion blocks (101) surround to form a barrel shape, and an oval shape is presented between the multiple groups of extrusion blocks (101). A lower oil groove (102) is respectively opened at the bottom end of each group of extrusion blocks (101). Two first abutting blocks (103) are slidably connected to the inner wall of the lower oil groove (102). The two first abutting blocks (103) extend to the outside of the extrusion block (101). A reset spring (104) is respectively fixedly connected to the side wall of each first abutting block (103). The end of the reset spring (104) is fixedly connected to the inner wall of the lower oil groove (102). The inner wall of the lower oil groove (102) communicates with two connecting pipes (105). An upper oil groove (108) is opened at a position near the top end of the inner wall of each extrusion block (101). A dovetail groove (106) is opened on the side wall of the extrusion block (101). The upper oil groove (108) communicates to the inside of the dovetail groove (106). Two second abutting blocks (107) are slidably connected to the inner wall of the upper oil groove (108). The top end of the connecting pipe (105) communicates to the upper oil groove (108); A contraction mechanism (2) is sleeved outside the tooling main body (1). The contraction mechanism (2) includes multiple groups of side plates (209). A dovetail pin (210) is respectively fixedly connected to the side wall of each group of side plates (209). The dovetail pin (210) is slidably sleeved on the inner wall of a dovetail groove (106); An upper slider (109) is respectively slidably connected to the top end of each group of extrusion blocks. A curling plate (110) is fixedly connected to the top end of the upper slider (109). An upper hydraulic rod (111) is fixedly connected to the side wall of the upper slider (109). The end of the upper hydraulic rod (111) is fixedly connected to the top end of the extrusion block (101); The bottom end of the upper hydraulic rod (111) communicates with a communication valve (112). The bottom end of the communication valve (112) communicates to the inside of the upper oil groove (108).

2. The necking tooling for the hollow-solid bushing according to claim 1, characterized in that: A through hole (113) is opened in the inner wall of the communication valve (112). A sealing plate (114) is slidably connected to the inside of the communication valve (112). The sealing plate (114) fits above the through hole (113). Two pressure springs (115) are fixedly connected to the top end of the sealing plate (114). The top end of the pressure spring (115) is fixedly connected to the inner wall of the communication valve (112).

3. A necking tool for hollow and solid bushings according to claim 1, characterized in that: The contraction mechanism (2) further includes an outer frame (201). The outer frame (201) is slidably sleeved on the outer walls of multiple groups of side plates (209). A guide block (211) is fixedly connected to the bottom end of the side plate (209). Multiple chutes that match the guide block (211) are opened at the bottom end of the outer frame (201).

4. A necking tool for an air-core and solid-core bushing according to claim 3, characterized in that: A hook (212) is respectively fixedly connected to the bottom end of multiple groups of guide blocks (211). An elastic ring (213) is sleeved on the outer walls of multiple groups of hooks (212). The elastic ring (213) is an elastic metal ring with an opening.

5. A necking tool for hollow and solid bushings according to claim 4, characterized in that: The side walls of the outer frame (201) are slidably sleeved with multiple groups of sliding rods (202). The bottom ends of the multiple groups of sliding rods (202) are fixedly connected to a bottom plate (203). The inner wall of the bottom plate (203) is fixedly sleeved with a lower hydraulic rod (205), and the top end of the lower hydraulic rod (205) is fixedly connected to the bottom end of the outer frame (201).

6. A necking tool for hollow and solid bushings according to claim 5, characterized in that: The top ends of each group of sliding rods (202) are respectively fixedly connected to a group of sliding rods (204). The outer wall of the sliding rod (204) is slidably sleeved with a rotating arm (206). The rotating arm (206) is provided with a sliding groove (207) at the position where it contacts the sliding rod (204). The end of the rotating arm (206) is rotatably connected to a roller (208).

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