Method for preventing deformation of a spacer in a multilayer rod end spherical hinge and vulcanization mold

Abstract

This invention relates to the field of rubber-metal composite elastic component processing technology, specifically disclosing a vulcanization molding die for preventing deformation of the spacer in a multi-layer rod end ball joint. The die includes an injection cylinder and an injection insert located inside the injection cylinder. The rod end ball joint is placed within the injection insert. The injection cylinder and the injection insert are respectively provided with multiple injection grooves and injection cavities located axially along the rod end ball joint. The bottom wall of the injection cavity is provided with multiple annular injection channels communicating with the flow channels of each injection layer. The annular injection channels on the multiple injection cavities together form multiple injection rings corresponding to the injection layers. This invention also provides a vulcanization molding method for preventing deformation of the spacer in a multi-layer rod end ball joint. By adjusting the flow channel area of ​​the arc-shaped injection channels to control the injection volume, the rubber in each injection layer of the multi-layer rod end ball joint is simultaneously filled, preventing spacer deformation or displacement.

Description

Technical Field

[0001] This invention relates to a vulcanization molding method and vulcanization mold for preventing deformation of the diaphragm in a multi-layer rod end ball joint, belonging to the field of rubber-metal composite elastic component processing technology. Background Technology

[0002] Ball joints at rod ends are important vibration damping connection components, widely used in trains, high-speed trains, automobiles, and ships. When the vehicle body is subjected to complex loads such as radial, torsional, and deflection loads, the deformation of the ball joint at the rod end helps to withstand the torsional angle and radial load, preventing the vehicle body from overturning during operation. Currently, ball joints at rod ends commonly adopt either a pure metal joint form or a single-layer rubber joint vulcanized body form with a metal outer shell, a single rubber layer, and a metal inner shell. Pure metal joints have poor environmental adaptability, especially in dusty environments where they are prone to wear. In practical applications, they often produce large-area abnormal noises, and the noise problem cannot be improved by modifying the metal joint, leading to a reduced service life of the metal joint. Moreover, pure metal joints are expensive. Ball joints at rod ends with a single-layer rubber joint form with a metal outer shell, a single rubber layer, and a metal inner shell have low radial stiffness, can only withstand relatively small radial stiffness, and have poor resistance to torsional loads. During use, the rubber layer is prone to wrinkling and breakage, resulting in a short service life of the ball joint.

[0003] Therefore, to increase the radial stiffness of the rubber body and enable the vehicle body to withstand greater loads, spacers are often added to the rubber layer under many operating conditions. These spacers divide the rubber layer into several layers, forming a multi-layered rod-end ball joint structure: metal outer shell - rubber layer one - metal spacer - rubber layer two - metal spacer... rubber layer N - metal inner shell. During the vulcanization process of the multi-layered rod-end ball joint, it is usually necessary to inject adhesive between the outer shell, spacer, and inner shell. In the prior art, the following patent relates to the adhesive injection of multi-layered rod-end ball joints: Patent No. "201010550506.1", patent titled "An Injection Method for a Spherical Rod-End Ball Joint and a Molded Spherical Rod-End Ball Joint", relates to improvements in the adhesive injection method during the molding of a helicopter rotor spherical rod-end ball joint. This patent includes, for example... Figure 1The diagram shows a large connector 1, a small connector 2, 5 to 30 spherical metal spacers 3, and a rubber body within the injection layer 9. The large connector 1 has a central injection hole 1b, and each spherical spacer 3 has a central injection hole 3a. The outer port of the injection hole 1b faces upwards. A rubber injection machine is used to inject rubber through the outer port of the injection hole 1b. The rubber flows through the injection holes 3a of the spherical spacers 3 along the gaps between the spacers 3 until it fills the gaps between the large connector 1 and the spherical spacers 3, between adjacent spherical spacers 3, and between the spherical spacers 3 and the small connector 2. This injection method allows the spherical spacers to form an "arch" under the pressure of the rubber injection during the injection process. The arrangement of the spherical spacers enhances their compressive strength under downward pressure, preventing deformation or stacking. Furthermore, the adhesive injection method in this invention, which directs the flow along the spherical surface, reduces injection resistance, improves adhesive flowability, and prevents problems such as rubber scorching, uneven vulcanization, insufficient rubber density, and adhesion failure between the rubber and metal spacers. However, the adhesive injection method in this patent has the following problems:

[0004] 1. The time for rubber to flow into each injection layer 9 and the time for rubber to fill are different. This will create a pressure difference within different injection layers 9, causing deformation of the partition 3. Specifically, in this comparative document, rubber is injected from a large joint injection hole 1b, and then injected into each rubber layer from top to bottom through the injection hole 3a of the partition 3; for example... Figure 1 As shown, the rubber will first flow from the injection hole 1b into the first injection layer 9a, and then flow sequentially down into the second injection layer, the third injection layer, the fourth injection layer 9b, and so on, finally flowing into the nth injection layer 9n. According to the injection method in the aforementioned comparative document, some injection layers 9 (such as the first injection layer 9a) will have rubber flowing in and filling first, while other injection layers 9 (such as the nth injection layer 9n) will have rubber flowing in later. If the first injection layer 9a is filled first, but the fourth injection layer 9b or the nth injection layer 9n is not filled, a pressure difference will be formed between the first injection layer 9a and the fourth injection layer 9b or the nth injection layer 9n, which will cause the spacer 3 to deform.

[0005] 2. Insufficient rubber: This results in insufficient or no rubber being injected into certain injection layers 9. Specifically, the rubber cools down during the injection process, leading to poor flowability. In the injection method described in the comparative document, the rubber first flows into the first injection layer 9a and then flows downwards. Since the rubber in the lower injection layers 9 has a longer flow path, there is a risk that the rubber will cool down and become very fluid before it fills or flows into the lower injection layers 9, resulting in insufficient or absent rubber in the lower rubber layers.

[0006] 3. Bubble phenomenon affects product quality. Specifically, if the upper injection layer 9 injects glue quickly, air in the upper injection layer 9 may be expelled downwards during the injection process. In addition, if the lower injection layer 9 injects glue slowly, air pockets will form inside the rubber, thus affecting product quality and service life.

[0007] Therefore, designing a method to improve the uniformity of adhesive injection in each layer of the laminated rubber-metal rod end ball joint, in order to avoid the above-mentioned problems, is an urgent issue that needs to be addressed. Summary of the Invention

[0008] The purpose of this invention is to provide a vulcanization molding method for preventing deformation of the partition in a multi-layer rod end ball joint. Multiple injection cavities and arc-shaped injection channels are matched to the different injection volumes of multiple injection layers. The injection volume is controlled by adjusting the orifice area of ​​the arc-shaped injection channels, ensuring that the rubber in each injection layer of the multi-layer rod end ball joint is simultaneously filled, improving the uniformity of injection and preventing deformation, displacement, or breakage of the partition. This invention also discloses a vulcanization mold for preventing deformation of the partition in a multi-layer rod end ball joint.

[0009] To achieve the above objectives, the present invention proposes the following technical solution: a vulcanization molding method for preventing deformation of the partition plate in a multi-layer rod end ball joint, wherein multiple injection cavities are evenly distributed along the circumferential direction based on the different injection volumes of multiple injection layers and taking the axial center line L1 of the rod end ball joint as a reference; multiple arc-shaped injection channels are set in the injection cavities to match each injection layer; the arc-shaped injection channels in the multiple injection cavities together form multiple injection rings corresponding to the injection layers; the injection volume is controlled by adjusting the flow area of ​​the arc-shaped injection channels so that the rubber in each injection layer in the multi-layer rod end ball joint is simultaneously filled.

[0010] Preferably, the amount of adhesive injected is controlled by adjusting the flow channel opening area of ​​the arc-shaped adhesive injection channel, including the following steps:

[0011] S1: Calculate the required rubber volume in each injection layer based on the actual working conditions of the product;

[0012] S2: Calculate the total flow channel area of ​​the corresponding injection ring layer based on the required rubber volume in each injection layer;

[0013] S3: Divide the total flow channel area of ​​the corresponding glue injection ring layer by the number of glue injection cavities to obtain the flow channel area of ​​a single arc-shaped glue injection channel;

[0014] S4: By adjusting the arc length H1 and width H2 of the flow channel opening in a single arc-shaped glue injection channel, the flow channel opening area calculated in step S3 is matched to control the amount of glue injected in the corresponding glue injection layer.

[0015] Preferably, injection cavities are provided on both sides of the radial centerline L2 of the ball joint at the rod end. The flow path of the rubber during the injection process is reduced by the bidirectional injection method, thereby reducing the injection fluctuation phenomenon of the rubber.

[0016] A vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint, using the above-mentioned method for rubber injection, includes a rubber injection cylinder and a rubber injection insert located inside the rubber injection cylinder. The rubber injection insert includes an upper insert and a lower insert, and the rod end ball joint is placed inside the upper insert and the lower insert. The rod end ball joint includes a mandrel, an outer sleeve, and multiple spacers located between the mandrel and the outer sleeve. Multiple rubber injection layers are formed between adjacent spacers and between spacers and the mandrel or outer sleeve. The rubber injection cylinder is provided with a rubber injection groove located axially upward of the rod end ball joint. The upper insert is provided with a rubber injection cavity communicating with the rubber injection groove. Multiple arc-shaped rubber injection channels that match and communicate with each rubber injection layer are opened on the bottom wall of the rubber injection cavity. The amount of rubber injected into each rubber injection layer is controlled by adjusting the flow area of ​​each arc-shaped rubber injection channel so that the rubber in each rubber injection layer is filled simultaneously.

[0017] Preferably, the upper insert has multiple glue injection cavities evenly distributed along the circumferential direction with the axial center line L1 of the ball joint at the rod end as the reference; the arc-shaped glue injection channels in the multiple glue injection cavities together form multiple glue injection rings corresponding to the glue injection layer, and each glue injection ring corresponds to one glue injection layer, that is, the arc-shaped glue injection channels on each glue injection ring are evenly spaced in the circumferential direction in each glue injection cavity and are connected to the corresponding glue injection layer.

[0018] Preferably, the bottom wall of the injection cavity is set parallel to the radial center line L2 of the ball joint at the rod end, that is, the flow openings of different arc-shaped injection channels are set flush; the arc length H1 and width H2 of the flow opening in different arc-shaped injection channels are set according to the injection amount of the corresponding injection layer, and the width H2 of the flow opening is 0.2mm-1.5mm.

[0019] Preferably, the sidewall of the arc-shaped glue injection channel is a glue injection wall, which is an inclined wall structure that slopes outward from the glue inlet towards the channel opening, and the angle α between the glue injection wall and the axial mid-section F of the arc-shaped glue injection channel is ≤4°.

[0020] Preferably, the injection cavity has a fan-shaped structure, and the multiple arc-shaped injection channels within the same injection cavity have an overall fan-shaped structure that matches the injection cavity; the arc-shaped injection channels are connected to the middle position of the corresponding injection layer, and the distance H3 between adjacent arc-shaped injection channels is determined by the thickness of the rubber body within the injection layer.

[0021] Preferably, the shape of the injection groove matches the shape of the injection cavity and the injection groove is not smaller than the injection cavity; the length of the line H4 connecting the middle of adjacent injection cavities is ≥5mm.

[0022] Preferably, the glue injection cylinder includes an upper cylinder and a lower cylinder, and the glue injection insert includes an upper insert and a lower insert. The upper insert and the lower insert are placed between the upper cylinder and the lower cylinder, and the rod end ball joint is placed between the upper insert and the lower insert. An upper glue injection groove and an upper glue injection cavity are matched between the upper cylinder and the upper insert, and a lower glue injection groove and a lower glue injection cavity are matched between the lower cylinder and the lower insert, so as to perform bidirectional glue injection.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention has multiple injection cavities and multiple arc-shaped injection channels matching each injection layer within the injection cavities. The arc-shaped injection channels in the multiple injection cavities together form multiple injection rings corresponding to the injection layers. By adjusting the flow area of ​​the arc-shaped injection channels, the injection volume can be controlled, so that the injection system is in a theoretical equilibrium state, that is, the rubber in each injection layer can be filled at the same time, avoiding the deformation and displacement of the partition caused by uneven injection in each injection layer of the multi-layer rod end ball joint.

[0025] 2. The injection wall of the arc-shaped injection channel in this invention is an inclined wall structure that slopes outward from the injection port toward the channel opening. That is, the arc-shaped injection channel is relatively narrow at the root near the injection port. When the injection is completed and the cleaning is performed, the glue can be automatically cut off at the narrower root of the arc-shaped injection channel, which greatly reduces the difficulty of cleaning and saves cleaning time. At the same time, the size of the injection groove is not smaller than the size of the injection cavity, which facilitates the cleaning of glue in the injection groove and injection cavity.

[0026] 3. The upper cylinder and the upper insert are provided with an upper glue injection groove and an upper glue injection cavity, and the lower cylinder and the lower insert are provided with a lower glue injection groove and a lower glue injection cavity, so as to perform bidirectional glue injection, which can reduce the flow stroke of the rubber, shorten the flow time of the rubber, avoid the glue injection fluctuation phenomenon of the rubber itself, and improve the stability of glue injection. Attached Figure Description

[0027] Figure 1 This is a schematic diagram in the background art.

[0028] Figure 2 This is a schematic diagram of the overall structure of the injection molding device in Example 1.

[0029] Figure 3 This is a cross-sectional view (axial side) of the injection molding device in Example 1.

[0030] Figure 4 This is a cross-sectional view of the glue injection molding device in Example 1 (the glue injection plug is not shown).

[0031] Figure 5 This is a cross-sectional view of the glue injection molding device in Example 1 (front view, glue injection plug not shown).

[0032] Figure 6This is a schematic diagram of the glue-filled insert in Example 1.

[0033] Figure 7 for Figure 6 A magnified view of a portion of point A in the middle.

[0034] Figure 8 This is a top view of the glue-filled insert in Example 1.

[0035] Figure 9 for Figure 8 A top view of one of the glue injection cavities.

[0036] Figure 10 for Figure 8 Cross-sectional view along the BB direction.

[0037] Figure 11 This is a schematic diagram of the glue injection wall in Example 1.

[0038] Figure 12 This is a cross-sectional view of the glue injection molding device in Example 2 (front view, top glue injection plug not shown).

[0039] Figure 13 This is a schematic diagram of the rubber flow path in Example 2.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1. Large connector; 2. Small connector; 3. Spacer; 5. Mandrel; 6. Outer sleeve; 7. Glue injection cylinder; 7a. Upper cylinder; 7b. Lower cylinder; 8. Glue injection insert; 8a. Upper insert; 8b. Lower insert; 9. Glue injection layer; 10. Glue injection groove; 11. Glue injection cavity; 12. Bottom wall; 13. Arc-shaped glue injection channel; 14. Channel opening; 15a. Innermost glue injection ring layer; 15b. Glue injection ring layer two; 15n+1. Outermost glue injection ring layer; 16. Glue injection wall; 17. Upper glue injection groove; 18. Lower glue injection groove; 19. Upper glue injection cavity; 20. Lower glue injection cavity; 21. Base; 22. Glue injection plug; 23. Receiving cavity; 24. Glue inlet; 25. Lower glue injection plug. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-13 The invention will be described in further detail below, wherein the radial direction of the ball joint at the rod end is... Figure 5 As shown in M, the axial direction of the ball joint at the rod end is... Figure 5 The direction shown in N.

[0043] Example 1

[0044] This implementation example Figure 2-11 As shown, a vulcanization molding method for preventing deformation of the diaphragm in a multi-layer rod end ball joint is described. Figure 6 , 7As shown, based on the different injection volumes of multiple injection layers 9, and taking the axial centerline L1 of the ball joint at the rod end as a reference, multiple injection cavities 11 are evenly distributed along the circumferential direction. Multiple arc-shaped injection channels 13 are arranged within the injection cavities 11 to match each injection layer 9, such as... Figure 8 As shown, the arc-shaped injection channels 13 within the multiple injection cavities 11 collectively form multiple injection rings corresponding to the injection layers 9. Each injection ring corresponds to one injection layer 9. Rubber is injected into the injection layer 9 through the arc-shaped injection channels 13 within the injection rings. The injection amount is controlled by adjusting the area of ​​the flow opening 14 of the arc-shaped injection channels 13, so that the rubber in each injection layer 9 in the multi-layer rod end ball joint is filled simultaneously, and the injection system is in a theoretical equilibrium state, that is, the amount of rubber in each layer matches the required amount of rubber. Rubber will not enter the unfilled injection layer 9 because the rubber in a certain injection layer 9 is filled first, further avoiding the formation of pressure differences in adjacent injection layers 9, and preventing the deformation and displacement of the spacer 3 when the pressure difference exceeds the yield force of the metal spacer 3. At the same time, it can also prevent the occurrence of insufficient rubber or air bubbles in some injection layers 9.

[0045] The amount of adhesive injected is controlled by adjusting the area of ​​the flow opening 14 of the arc-shaped adhesive injection channel 13, including the following steps:

[0046] S1: Calculate the required rubber volume in each injection layer 9 based on the actual working conditions of the product;

[0047] S2: Calculate the total flow channel area of ​​the corresponding injection ring layer based on the required rubber volume in each injection layer 9;

[0048] S3: Divide the total flow channel area of ​​the corresponding glue injection ring layer by the number of glue injection cavities 11 to obtain the area of ​​the flow channel 14 of a single arc-shaped glue injection channel 13;

[0049] S4: By adjusting the arc length H1 and width H2 of the flow channel opening 14 in a single arc-shaped dispensing channel 13, the area of ​​the flow channel opening 14 calculated in step S3 is matched to control the amount of dispensing material in the corresponding dispensing layer 9; here, the arc length H1 is an approximate length of the flow channel opening 14, specifically as follows: Figure 9 As shown, the flow channel 14 includes arc K1 and arc K2, with lengths H1a and H1b respectively. The arc length H1 of the flow channel 14 is the average of the sum of the lengths of arc K1 and arc K2, H1 = (H1a + H1b) / 2, that is, the arc length H1 of the flow channel 14 is an approximate length. By adjusting the arc length H1 and width H2 of the flow channel 14 in the arc-shaped glue injection flow channel 13, the glue injection area in each glue injection layer 9 can be adjusted.

[0050] A vulcanizing mold for preventing deformation of the spacers in a multi-layered rod end ball joint, employing the aforementioned vulcanization molding method for rubber injection, wherein the rod end ball joint includes a mandrel 5, an outer sleeve 6, and multiple spacers located between the mandrel 5 and the outer sleeve 6. Multiple injection layers 9 are formed between adjacent spacers and between the spacers and the mandrel 5 or the outer sleeve 6. During the molding process of the rod end ball joint, rubber needs to be injected into the injection layers 9, and the end of each injection layer 9 is a rubber inlet 24; Figure 7 As shown, this embodiment includes multiple spacers arranged sequentially from the inside out, such as spacer 3a, spacer 3b, ..., spacer n3n. The size, length and specifications of the different spacers 3 are different, that is, the amount of adhesive required between different adhesive layers 9 is also different.

[0051] like Figure 3-6 The vulcanizing mold includes a glue injection cylinder 7 and a glue injection insert 8 located inside the glue injection cylinder 7. The glue injection insert 8 includes an upper insert 8a and a lower insert 8b. The upper insert 8a and the lower insert 8b are provided with matching receiving areas for placing the rod end ball joint. The rod end ball joint is placed in the receiving areas of the upper insert 8a and the lower insert 8b. During glue injection, the glue injection cylinder 7 is located on the upper insert 8a, and the glue injection cylinder 7 injects glue through the glue injection plug 22 located above it. The glue injection cylinder 7 is provided with a glue injection groove 10 located axially on the rod end ball joint. 8a is provided with a glue injection cavity 11 that communicates with the glue injection groove 10. The bottom wall 12 of the glue injection cavity 11 is provided with multiple arc-shaped glue injection channels 13 that are matched and communicated with each glue injection layer 9. The glue injection amount of each glue injection layer 9 is controlled by adjusting the flow port 14 of each arc-shaped glue injection channel 13 so that the rubber in each glue injection layer 9 is filled at the same time. At the same time, the lower insert 8b is provided with a base 21 at the lower end to assist the glue injection work. Those skilled in the art can also choose whether to set the base 21 according to the actual situation.

[0052] like Figure 5-8 As shown, multiple injection cavities 11 are evenly distributed along the circumferential direction on the upper insert 8a with the axial center line L1 of the ball joint at the rod end as the reference. In this embodiment, a total of 6 injection cavities 11 are provided. Those skilled in the art can also set other numbers of injection cavities 11 according to actual conditions. The arc-shaped injection channels 13 in the multiple injection cavities 11 together form multiple injection rings corresponding to the injection layer 9. For example, the innermost arc-shaped injection channels 13 together form the innermost injection ring 15a, the second outermost arc-shaped injection channels 13 together form the second injection ring 15b, ..., and the outermost arc-shaped injection channels 13 together form the outermost injection ring 15n+1. Each injection ring corresponds to one injection layer 9. The arc-shaped injection channels 13 on each injection ring are evenly spaced in the circumferential direction in each injection cavity 11 and are connected to the corresponding injection layer 9. Glue is injected into the injection layer 9 through the multiple arc-shaped injection channels 13 on the injection ring.

[0053] like Figure 8 and Figure 9 As shown, the injection cavity 11 has a fan-shaped structure, as... Figure 9 As shown at point Q, the multiple arc-shaped injection channels 13 within the same injection cavity 11 form a fan-shaped structure that matches the injection cavity 11. In this embodiment, the amount of glue required for the innermost injection layer 9 gradually increases towards the outermost injection layer 9. The fan-shaped structure here is to match the different amounts of glue in each injection layer 9 in this embodiment. Those skilled in the art can set the injection cavity 11 of the corresponding shape according to the glue amount requirements of each layer of the ball joint at the rod end in actual working conditions. The distance H3 between adjacent arc-shaped injection channels 13 is determined by the thickness of the rubber body within the injection layer 9. Figure 4 As shown, the shape of the injection groove 10 matches the shape of the injection cavity 11. The injection groove 10 is not smaller than the injection cavity 11. In this embodiment, the injection groove 10 is slightly larger than the injection cavity 11. Specifically, the length of each groove wall in the injection groove 10 is 1-2 mm longer than the length of each cavity wall in the injection cavity 11, so as to facilitate cleaning the glue after vulcanization. The length of the line H4 connecting the middle of adjacent injection cavities 11 is ≥5 mm, so as to avoid affecting the strength of the injection insert 8 due to H4 being too small, and further improve the stability of injection vulcanization. Figure 7 As shown, the arc-shaped injection channel 13 is connected to the middle position of the corresponding injection layer 9 to improve the uniformity of injection.

[0054] like Figure 5 As shown, the bottom wall 12 of the glue injection cavity 11 is arranged parallel to the radial center line L2 of the ball joint at the rod end, that is, the flow openings 14 of different arc-shaped glue injection channels 13 are arranged flush with each other. The height of each arc-shaped glue injection channel 13 is the distance between the flow opening 14 and the glue inlet 24. The height of each arc-shaped glue injection channel 13 is fixed. The arc length H1 and width H2 of the flow opening 14 in different arc-shaped glue injection channels 13 are set according to the glue injection amount of the corresponding glue injection layer 9. The width H2 of the flow opening 14 is 0.2mm-1.5mm. Those skilled in the art can preferably set H2 to 0.2mm, 0.6mm, 0.8mm or 1mm according to actual needs.

[0055] The sidewall of the arc-shaped glue injection channel 13 is the glue injection wall 16. The glue injection wall 16 is an outwardly inclined wall structure from the glue inlet 24 towards the channel opening 14. That is, the arc-shaped glue injection channel 13 is relatively narrow at the root near the glue inlet 24. When the glue injection is completed and the glue is cleaned, the glue can be automatically cut off at the narrower root of the arc-shaped glue injection channel 13, which greatly reduces the difficulty of glue cleaning. Figure 11 As shown, the included angle α between the glue injection wall 16 and the axial mid-section F of the arc-shaped glue injection channel 13 is ≤4°, and α=2° in this embodiment.

[0056] It is worth noting that the number of injection cavities 11 is set according to actual needs. In this embodiment, 6 injection cavities 11 are evenly set according to the injection amount requirements of the ball joint at the rod end. Those skilled in the art can also set other numbers of injection cavities 11 according to product size, injection amount, etc., and it is preferred to set an even number of injection cavities 11.

[0057] Implementation method:

[0058] When injecting rubber, the rubber is first filled into the receiving cavity 23, and then the rubber in the receiving cavity 23 is squeezed downward using the injection plug 22. The rubber flows into the injection cavity 11 through the injection groove 10. Furthermore, the rubber in the injection cavity 11 continues to be injected into each injection layer 9 through the arc-shaped injection channel 13, and the rubber in each injection layer 9 is filled at the same time.

[0059] Example 2

[0060] like Figure 12-13 As shown, the difference between this embodiment and Embodiment 1 is that, in a vulcanization molding method for preventing deformation of the diaphragm in a multi-layer rod end ball joint, injection cavities 11 can be provided on both sides of the radial centerline L2 of the rod end ball joint. This bidirectional injection method reduces the flow path of the rubber during injection, thereby reducing rubber injection fluctuations. Rubber fluctuations during flow affect injection stability; for example, when the flow path of the rubber is long, its fluidity deteriorates, affecting injection stability and product performance. Specifically, as shown... Figure 13 As shown, a is a schematic diagram of unidirectional glue injection, and b is a schematic diagram of bidirectional glue injection in this embodiment; in a, the glue injection direction of the rubber is f1, and the glue injection stroke is e1; in b, the glue injection directions are f2 and f3, and the glue injection strokes are e2 and e3, e2=e3=½e1. That is, compared with unidirectional glue injection, under the same glue injection amount, the rubber stroke is reduced by half in bidirectional glue injection, which can greatly reduce the fluctuation of the rubber and improve the stability of glue injection.

[0061] A vulcanizing mold for preventing deformation of the spacer plate in a multi-layer rod end ball joint, wherein the above-mentioned vulcanization molding method is used for injection molding, such as... Figure 12 As shown, the glue injection cylinder 7 includes an upper cylinder 7a and a lower cylinder 7b. An upper insert 8a and a lower insert 8b are placed between the upper and lower cylinders 7b, and a rod end ball joint is placed between the upper insert 8a and the lower insert 8b. An upper glue injection groove 17 and an upper glue injection cavity 19 are matched between the upper cylinder 7a and the upper insert 8a, and a lower glue injection groove 18 and a lower glue injection cavity 20 are matched between the lower cylinder 7b and the lower insert 8b. The upper cylinder 7a and the lower cylinder 7b are respectively provided with an upper glue injection plug and a lower glue injection plug 25 for injecting the rubber in the upper glue injection groove 17 and the lower glue injection groove 18 into the glue injection layer 9, thereby performing bidirectional glue injection.

[0062] Implementation method:

[0063] When injecting rubber, first fill the upper injection cavity 19 and the lower injection cavity 20 with rubber, then use the upper injection plug and the lower injection plug 25 to squeeze the rubber in the upper injection cavity 19 and the lower injection cavity 20 toward the injection layer 9. The rubber flows into the arc-shaped injection channel 13 through the upper injection groove 17 and the lower injection groove 18 until the rubber in each injection layer 9 is filled at the same time.

[0064] The above embodiments are merely explanations of the present invention and are not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to the embodiments of the present invention without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A vulcanizing mold for preventing deformation of the diaphragm in a multi-layer rod end ball joint, characterized in that, The device includes a glue injection cylinder (7) and a glue injection insert (8) located inside the glue injection cylinder (7). The glue injection insert (8) includes an upper insert (8a) and a lower insert (8b). The rod end ball joint is placed inside the upper insert (8a) and the lower insert (8b). The rod end ball joint includes a spindle (5), an outer sleeve (6), and multiple spacers located between the spindle (5) and the outer sleeve (6). Multiple glue injection layers (9) are formed between adjacent spacers and between the spacers and the spindle (5) or the outer sleeve (6). The device is characterized in that the glue injection cylinder ( 7) The upper part is provided with a glue injection groove (10) located on the axial direction of the ball joint at the rod end. The upper insert (8a) is provided with a glue injection cavity (11) communicating with the glue injection groove (10). The bottom wall (12) of the glue injection cavity (11) is provided with multiple arc-shaped glue injection channels (13) that are matched and communicated with each glue injection layer (9). The glue injection amount of each glue injection layer (9) is controlled by adjusting the area of ​​the flow opening (14) of each arc-shaped glue injection channel (13) so that the rubber in each glue injection layer (9) is filled at the same time. Based on the different injection volumes of multiple injection layers (9), multiple injection cavities (11) are evenly distributed along the circumferential direction with the axial center line L1 of the rod end ball joint as the reference. Multiple arc-shaped injection channels (13) are set in the injection cavities (11) to match each injection layer (9). The arc-shaped injection channels (13) in the multiple injection cavities (11) together form multiple injection rings corresponding to the injection layers (9). The injection volume is controlled by adjusting the area of ​​the flow opening (14) of the arc-shaped injection channel (13) so that the rubber in each injection layer (9) in the multi-layer rod end ball joint is filled at the same time. Injection cavities (11) are provided on both sides of the radial center line L2 of the ball joint at the rod end. The flow path of the rubber during the injection process is reduced by the bidirectional injection method to reduce the injection fluctuation phenomenon of the rubber.

2. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 1, characterized in that, The upper insert (8a) has multiple glue injection cavities (11) evenly distributed along the circumferential direction with the axial center line L1 of the ball joint at the rod end as the reference. The arc-shaped glue injection channels (13) in the multiple glue injection cavities (11) together form multiple glue injection rings corresponding to the glue injection layer (9). Each glue injection ring corresponds to one glue injection layer (9). That is, the arc-shaped glue injection channels (13) on each glue injection ring are evenly spaced in each glue injection cavity (11) in the circumferential direction and are connected to the corresponding glue injection layer (9).

3. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 2, characterized in that, The bottom wall (12) of the injection cavity (11) is set parallel to the radial center line L2 of the ball joint at the rod end, that is, the flow openings (14) of different arc-shaped injection channels (13) are set flush; the arc length H1 and width H2 of the flow openings (14) in different arc-shaped injection channels (13) are set according to the injection amount of the corresponding injection layer (9), and the width H2 of the flow opening (14) is 0.2mm-1.5mm.

4. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 3, characterized in that, The sidewall of the arc-shaped glue injection channel (13) is a glue injection wall (16). The glue injection wall (16) is an inclined wall structure that slopes outward from the glue inlet (24) toward the channel opening (14). The angle α between the glue injection wall (16) and the axial mid-section F of the arc-shaped glue injection channel (13) is ≤4°.

5. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 4, characterized in that, The injection cavity (11) has a fan-shaped structure, and the multiple arc-shaped injection channels (13) in the same injection cavity (11) are in a fan-shaped structure that matches the injection cavity (11); the arc-shaped injection channels (13) are connected to the middle position of the corresponding injection layer (9), and the distance H3 between adjacent arc-shaped injection channels (13) is determined by the thickness of the rubber body in the injection layer (9).

6. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 5, characterized in that, The shape of the glue injection groove (10) matches the shape of the glue injection cavity (11) and the glue injection groove (10) is not smaller than the glue injection cavity (11); the length of the line H4 connecting the middle of adjacent glue injection cavities (11) is ≥5mm.

7. The vulcanizing mold for preventing deformation of the spacer in a multi-layer rod end ball joint according to claim 6, characterized in that, The glue injection cylinder (7) includes an upper cylinder (7a) and a lower cylinder (7b). An upper insert (8a) and a lower insert (8b) are placed between the upper cylinder (7a) and the lower cylinder (7b). A ball joint at the rod end is placed between the upper insert (8a) and the lower insert (8b). An upper glue injection groove (17) and an upper glue injection cavity (19) are matched between the upper cylinder (7a) and the upper insert (8a). A lower glue injection groove (18) and a lower glue injection cavity (20) are matched between the lower cylinder (7b) and the lower insert (8b) to perform bidirectional glue injection.

8. A vulcanization molding method for preventing deformation of the spacer in a multi-layer rod end ball joint, comprising using a vulcanization mold as described in any one of claims 1-7 for vulcanization molding operation, characterized in that... The amount of adhesive injected is controlled by adjusting the area of ​​the flow opening (14) of the arc-shaped adhesive injection channel (13), including the following steps: S1: Calculate the required rubber volume in each injection layer (9) based on the actual working conditions of the product; S2: Calculate the total flow channel area of ​​the corresponding injection ring based on the required rubber volume in each injection layer (9); S3: Divide the total flow channel area of ​​the corresponding injection ring layer by the number of injection cavities (11) to obtain the flow channel area (14) of a single arc-shaped injection channel (13); S4: By adjusting the arc length H1 and width H2 of the channel opening (14) in a single arc-shaped injection channel (13), the area of ​​the channel opening (14) calculated in step S3 is matched to control the amount of injection in the corresponding injection layer (9).

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