Automobile rubber sealing ring forming die and forming method thereof

Abstract

The invention relates to the technical field of sealing ring forming, discloses an automobile rubber sealing ring forming mold and a forming method thereof, and aims to solve the problem of cavity dislocation caused by friction damage between a guide column of an upper mold and a guide hole of a lower mold. When the upper die is pressed downwards, the upper die extrudes the supporting spring, the supporting spring pushes the lower pressing plate to rotate and move downwards, the rotating lower pressing plate pushes the sliding block to move towards the axis of the guide hole, and therefore the guide columns are extruded and positioned, and it is guaranteed that the axis of each guide column and the axis of the guide hole are located on the same straight line; therefore, it is guaranteed that the lower cavity of the lower die is aligned with the upper cavity of the upper die, and the phenomenon that the lower cavity and the upper cavity are staggered due to the fact that the guide holes of the lower die and the guide columns of the upper die are abraded is avoided.

Description

Technical Field

[0001] This application relates to the field of sealing ring molding technology, and in particular to a molding die for automotive rubber sealing rings and its molding method. Background Technology

[0002] Automotive rubber seals are ring-shaped components made of rubber, primarily used to fill the gaps between two or more mating surfaces. They provide sealing, waterproofing, dustproofing, sound insulation, and vibration damping, ensuring that various automotive systems remain sealed and operate normally in complex working environments. The molding of automotive rubber seals mainly includes compression molding, injection molding, and extrusion molding, with the first two being the most common. Both compression molding and injection molding of automotive rubber seals require the use of molding dies.

[0003] A molding die typically includes a lower die with guide holes and an upper die with guide pillars. During compression molding, the weighed rubber blank is placed into the cavity of the preheated lower die, and then the vulcanizing machine is started. The upper and lower mold plates are closed. At this time, the guide pillars of the upper die are precisely inserted into the guide holes of the lower die. After the mold is closed, the machine applies a preset high pressure. After the vulcanization time is reached, the vulcanizing machine automatically opens the mold, and the operator removes the formed sealing ring from the lower die.

[0004] However, after the upper and lower molds have been closed hundreds of thousands or even millions of times, the guide pillars of the upper mold and the guide holes of the lower mold will suffer frictional damage. In subsequent use, even if the guide pillars of the upper mold are inserted into the guide holes of the lower mold, it cannot be guaranteed that the cavities of the upper and lower molds will not be misaligned. When the cavities of the upper and lower molds are misaligned, the produced rubber sealing rings will have quality problems. Summary of the Invention

[0005] This application proposes a molding die for automotive rubber seal rings and a molding method thereof, which has the advantage of preventing misalignment between the upper and lower mold cavities, thereby solving the problem of cavity misalignment caused by frictional damage between the guide post of the upper mold and the guide hole of the lower mold.

[0006] To achieve the above objectives, this application adopts the following technical solution: a molding die for an automotive rubber sealing ring and a molding method thereof, comprising a lower die and an upper die. The lower die has a lower cavity and a guide hole, and the upper die has an upper cavity and a guide post. An annular groove is formed on the side wall of the guide hole, and a plurality of sliding grooves are formed on the side wall of the annular groove. An alignment mechanism is provided in the annular groove and the sliding groove. The alignment mechanism includes: a slider, one end of which is slidably and sealingly installed in the sliding groove; a spiral post, which is fixedly installed on the inner wall of the annular groove; a lower pressure plate, which is slidably installed in the annular groove, and the side wall of the lower pressure plate has a snap-fit ​​groove, which snaps onto the spiral post. The bottom end of the lower pressure plate has a spiral groove, which snaps onto the upper end face of the slider extending into the annular groove; a support spring, which is fixedly connected to the upper end face of the lower pressure plate; and a plurality of elastic pads, which are fixedly installed at the bottom end of the annular groove, with their top ends below the lower end face of the lower pressure plate.

[0007] Furthermore, a plurality of ball bearings I are embedded in the top of the elastic pad, and the ball bearings I at the top of the elastic pad rest against the lower end face of the pressure plate.

[0008] Furthermore, the minimum number of sliding grooves and sliders is three.

[0009] Furthermore, a support ring is fixedly connected to the top of the support spring, and a number of ball bearings II are embedded in the upper end face of the support ring. A storage groove is opened on the lower end face of the upper mold at the position outside the guide post.

[0010] Furthermore, a limiting block is fixedly installed on the inner wall of the annular groove, and the limiting block is in close contact with the upper end face of the lower pressure plate.

[0011] Furthermore, the lower end face of the slider is provided with an installation groove, and a friction strip is fixedly installed at the bottom end of the sliding groove. The friction strip is slidably installed in the installation groove of the slider. A positioning ball is embedded at one end of the slider pointing to the axis of the ring groove. The lower end of the positioning ball contacts the friction strip. Several positioning grooves are provided on the side wall of the guide post of the upper mold.

[0012] Furthermore, the radius of the groove on the guide post is the same as the radius of the positioning ball on the slider.

[0013] Furthermore, the lower mold has an auxiliary groove, and the lower mold has a connecting hole that connects the sliding groove and the auxiliary groove. A top post is slidably and sealed in the auxiliary groove. The lower end face of the upper mold has an upper flash groove, and the upper end face of the lower mold, which is directly above the auxiliary groove, has a lower flash groove. The top of the top post has a lower flash groove.

[0014] Furthermore, the diameter of the top of the top post is greater than the width of the lower flash groove.

[0015] Furthermore, the following steps are included:

[0016] S1. During production, the rubber strip is placed in the lower cavity of the lower mold. The vulcanizing machine closes the lower mold and the upper mold. During the process of the upper mold moving down, the moving upper mold first contacts the support spring. The support spring provides a gradual resistance to the upper mold, converting the hard impact when the upper mold and the lower mold are attached into an elastic impact.

[0017] S2. When the support spring is squeezed by the upper mold, the support spring is compressed. The elastic force of the support spring pushes the lower pressure plate at the lower end to move down, and the lower pressure plate rotates along the direction of the spiral column. The spiral groove at the bottom of the rotating lower pressure plate pushes the slider to move to the guide column side wall of the upper mold. Multiple sliders squeeze the guide column at the same time, so that the axis of the guide column is on the same straight line as the axis of the guide hole and the annular groove.

[0018] S3. When the slider moves toward the axis of the annular groove, the positioning ball on the slider moves synchronously with the slider. The bottom end of the positioning ball rubs against the friction strip. The friction between the bottom end of the positioning ball and the friction strip drives the positioning ball to rotate. The impurities on the rotating positioning ball are scraped off by the side wall of the slider.

[0019] S4. As the lower pressure plate pushes the slider to move towards the axis of the ring groove, the slider sliding to the outside of the sliding groove expands the volume inside the sliding groove. The pressure of the auxiliary groove, the connecting hole and the gas in the sliding groove decreases. When the top column is squeezed on the lower end face of the upper mold, the impact force between the upper end face of the top column and the lower end face of the upper mold is reduced.

[0020] S5. After the rubber sealing ring is formed, the upper mold and the lower mold open. Since the support spring is no longer squeezed by the upper mold, the elastic force of the elastic pad pushes the lower pressure plate to reset, and the spiral groove at the bottom of the lower pressure plate pushes the slider to move into the sliding groove. The moving slider squeezes the gas in the sliding groove, so that the gas in the sliding groove enters the auxiliary groove through the connecting hole, pushing the top column in the auxiliary groove to move upward. The upward-moving top column lifts the rubber in the lower flash groove.

[0021] This application has the following beneficial effects:

[0022] 1. This application provides a molding die and molding method for automotive rubber seal rings. When the upper die is pressed down, it squeezes the support spring, causing the support spring to push the lower pressure plate to rotate and move downward. The rotating lower pressure plate pushes the slider to move along the axis of the guide hole, thereby squeezing and positioning the guide post. This ensures that the axis of each guide post is on the same straight line as the axis of the guide hole, thus ensuring that the lower cavity of the lower die is aligned with the upper cavity of the upper die. This avoids the phenomenon of misalignment between the lower cavity and the upper cavity caused by wear between the guide hole of the lower die and the guide post of the upper die.

[0023] 2. The automotive rubber seal ring molding die and molding method provided in this application, when the slider extends to position the axis of the guide post, the positioning ball at the top of the slider rubs against the friction strip, causing the positioning ball to roll. Impurities on the rolling positioning ball are scraped off by the side wall of the slider, thereby preventing the appearance of debris that falls off the rubber seal ring during material feeding on the positioning ball, preventing abnormal wear of the positioning ball and the positioning groove of the guide post, and thus avoiding positioning errors caused by abnormal wear.

[0024] 3. The automotive rubber sealing ring molding die and molding method provided in this application involve pushing the top post into the auxiliary groove when the upper mold moves downward. After molding, when the upper mold separates, the lower pressure plate moves upward and rotates back to its original position under the action of the elastic pad. The rotating lower pressure plate pushes the slider into the sliding groove, allowing the gas in the sliding groove to enter the auxiliary groove through the connecting hole, pushing the top post in the auxiliary groove upward. The upward-moving top post pushes the rubber out of the lower flash groove, thereby assisting in the demolding of the molded rubber sealing ring. The molded rubber sealing ring has a demolding opening, which is convenient for subsequent workers to pull and prevents the molded rubber sealing ring from sticking to the lower cavity and being difficult to remove. Attached Figure Description

[0025] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0026] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0027] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the lower mold of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the mold of the present invention;

[0030] Figure 4 This is a cross-sectional view of the mold of the present invention;

[0031] Figure 5 For the present invention Figure 4 Enlarged view of the local structure at point A in the middle;

[0032] Figure 6 For the present invention Figure 4 Enlarged view of the local structure at point B;

[0033] Figure 7 This is a cross-sectional view of the two guide holes diagonally opposite each other in the lower mold of the present invention;

[0034] Figure 8 For the present invention Figure 7Enlarged view of the local structure at point C;

[0035] Figure 9 This is a schematic diagram of the alignment mechanism of the present invention.

[0036] In the diagram: 1. Lower mold; 11. Lower cavity; 12. Guide hole; 13. Ring groove; 131. Limiting block; 14. Sliding groove; 15. Auxiliary groove; 16. Connecting hole; 17. Lower flash groove; 2. Upper mold; 21. Upper cavity; 22. Guide pillar; 221. Positioning groove; 23. Storage groove; 24. Upper flash groove; 3. Alignment mechanism; 31. Slider; 311. Mounting groove; 32. Lower pressure plate; 321. Spiral groove; 322. Snap-fit ​​groove; 33. Spiral pillar; 34. Support spring; 35. Elastic pad; 351. Ball I; 36. Support ring; 361. Ball II; 4. Friction strip; 5. Positioning ball; 6. Top pillar. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] Example 1

[0039] Please see Figures 1-4 A molding die for an automotive rubber seal ring includes a lower die 1 and an upper die 2. The upper end face of the lower die 1 has a lower cavity 11 and guide holes 12 are provided at the four corners of the upper end face of the lower die 1. The lower end face of the upper die 2 has an upper cavity 21. The lower cavity 11 and the upper cavity 21 correspond one-to-one. Guide posts 22 are fixedly installed at the four corners of the lower end face of the upper die 2. When the lower die 1 and the upper die 2 are closed, the axis of the guide hole 12 at the corresponding position is on the same straight line as the axis of the guide post 22.

[0040] Please see Figures 1-9The guide hole 12 of the lower mold 1 has an annular groove 13 on its side wall, forming a stepped groove. Several sliding grooves 14 arranged in a ring array are provided on the side wall of the annular groove 13. An alignment mechanism 3 for positioning the guide post 22 is provided within the annular groove 13 and the sliding groove 14. The alignment mechanism 3 includes a slider 31, a lower pressure plate 32, a spiral post 33, a support spring 34, and an elastic pad 35. One end of the slider 31 is slidably and sealed within the sliding groove 14, and the other end of the slider 31 extends into the annular groove 13. Several spiral posts 33 arranged in a ring array are fixedly installed on the inner wall of the annular groove 13. The lower pressure plate 32 is slidably installed within the annular groove 13, and the axis of the lower pressure plate 32 is aligned with the annular groove 14. The axes of the three are on the same straight line. The side wall of the lower pressure plate 32 is provided with several snap-fit ​​grooves 322 arranged in a ring array. The snap-fit ​​grooves 322 of the lower pressure plate 32 are snapped onto the spiral column 33 on the side wall of the ring groove 13. The bottom end of the lower pressure plate 32 is provided with a spiral groove 321. The spiral groove 321 of the lower pressure plate 32 is snapped onto the upper end face of the slider 31 extending into the ring groove 13. The upper end face of the lower pressure plate 32 is fixedly connected to a support spring 34. The upper end of the support spring 34 extends out of the ring groove 13. Several elastic pads 35 are fixedly installed at the bottom end of the ring groove 13. Several ball bearings I 351 are embedded in the top of the elastic pads 35, and the ball bearings I 351 at the top of the elastic pads 35 rest on the lower end face of the lower pressure plate 32.

[0041] When using molds to produce automotive rubber seals, the lower mold 1 and the upper mold 2 need to be installed on a vulcanizing machine. The rubber strip is placed in the lower cavity 11 of the lower mold 1. The vulcanizing machine moves the upper mold 2 down so that the upper mold 2 fits into the lower mold 1. During the downward movement of the upper mold 2, the moving upper mold 2 first contacts the top of the support spring 34. The support spring 34 provides a gradual resistance to the upper mold 2, converting the hard impact when the upper mold 2 fits into the lower mold 1 into an elastic impact, reducing the damage from the rigid impact when the upper mold 2 fits into the lower mold 1.

[0042] Furthermore, when the support spring 34 is pressed by the upper mold 2, the support spring 34 is compressed, and the elastic force of the compressed support spring 34 pushes the lower pressure plate 32 at the lower end to move downward. Since the snap-fit ​​groove 322 on the side wall of the lower pressure plate 32 is engaged with the spiral column 33, the downward-moving lower pressure plate 32 rotates synchronously along the direction of the spiral column 33. The spiral groove 321 at the bottom of the rotating lower pressure plate 32 pushes the slider 31 to move towards the axis of the annular groove 13. At this time, the slider 31 moving towards the axis of the annular groove 13 presses against the... On the side wall of the guide post 22 of the upper mold 2, multiple sliders 31 simultaneously press the guide post 22, so that the axis of the guide post 22 is on the same straight line as the axis of the guide hole 12 and the annular groove 13. Multiple sets of alignment mechanisms 3 simultaneously position the multiple guide posts 22 at the lower end of the upper mold 2, thereby ensuring that the lower cavity 11 of the lower mold 1 is aligned with the upper cavity 21 of the upper mold 2, and avoiding the phenomenon of misalignment between the lower cavity 11 and the upper cavity 21 caused by wear of the guide hole 12 of the lower mold 1 and the guide post 22 of the upper mold 2.

[0043] It should be noted that the minimum number of sliding grooves 14 and sliders 31 is three. When sliders 31 on the same side wall of the annular groove 13 press against the guide post 22, at least three sliders 31 are needed to position the axis of the guide post 22.

[0044] In addition, a support ring 36 is fixedly connected to the top of the support spring 34, and a number of balls II 361 arranged in a ring array are embedded on the upper end surface of the support ring 36. A storage groove 23 is provided on the lower end surface of the upper mold 2 at the position outside the guide post 22. When the upper mold 2 moves down and closes with the lower mold 1, the storage groove 23 on the upper mold 2 contacts the balls II 361 at the top of the support ring 36, so that the support ring 36 is in the storage groove 23, ensuring that the support spring 34 connected to the support ring 36 is in a vertical state. Furthermore, when the support spring 34 is squeezed and pushes the lower pressure plate 32 to rotate and move down, the support ring 36 at the upper end of the support spring 34 can also rotate synchronously, preventing the support spring 34 from being damaged due to torsion. In addition, the balls II 361 on the support ring 36 reduce the friction force when the support ring 36 rotates.

[0045] A limiting block 131 is fixedly installed on the inner wall of the annular groove 13. The limiting block 131 is close to the upper end face of the lower pressure plate 32. The limiting block 131 limits the position of the lower pressure plate 32 to prevent the elastic pad 35 from pushing the lower pressure plate 32 out of the annular groove 13.

[0046] In addition, the lower end face of the slider 31 is provided with a mounting groove 311, the length direction of the mounting groove 311 is directed towards the axis of the annular groove 13, the bottom end of the sliding groove 14 is fixedly installed with a friction strip 4, and the friction strip 4 is slidably installed in the mounting groove 311 of the slider 31. One end of the friction strip 4 extends into the annular groove 13 and the guide hole 12. The end of the slider 31 pointing towards the axis of the annular groove 13 is embedded with a positioning ball 5, and the lower end of the positioning ball 5 is in contact with the friction strip 4. The side wall of the guide post 22 of the upper mold 2 is provided with a plurality of positioning grooves 221 arranged in a ring array. When the guide post 22 is inserted into the guide hole 12, the positioning grooves 221 on the guide post 22 and the positioning balls 5 on the slider 31 are in corresponding positions, and the positioning balls 5 on the slider 31 slide in the positioning grooves 221 on the guide post 22.

[0047] During the process of the upper mold 2 moving downward and the lower mold 1 closing, the upper mold 2 squeezes the support spring 34, causing the support spring 34 to push the lower pressure plate 32 downward. At the same time, the lower pressure plate 32 rotates synchronously. The rotating lower pressure plate 32 pushes the slider 31 to move towards the axis of the annular groove 13. At this time, the positioning ball 5 on the slider 31 moves synchronously with the slider 31. Since the bottom end of the positioning ball 5 is in contact with the friction strip 4, when the positioning ball 5 moves with the slider 31, the bottom end of the positioning ball 5 rubs against the friction strip 4. The friction between the bottom end of the positioning ball 5 and the friction strip 4 drives the positioning ball 5 to rotate. Impurities on the rotating positioning ball 5 are scraped off by the side wall of the slider 31, thereby preventing the appearance of debris that falls off the rubber sealing ring during material feeding on the positioning ball 5, preventing abnormal wear of the positioning ball 5 and the positioning groove 221 of the guide post 22, and thus avoiding positioning errors caused by abnormal wear.

[0048] It should be further explained that the radius of the groove 221 on the guide post 22 is the same as the radius of the positioning ball 5 on the slider 31. When the rotating lower pressure plate 32 pushes the slider 31 to move towards the axis of the annular groove 13, the positioning ball 5 at the end of the slider 31 is exactly pressed against the positioning groove 221 of the guide post 22. The radius of the groove 221 on the guide post 22 is the same as the radius of the positioning ball 5 on the slider 31, which ensures the contact area between the positioning ball 5 and the positioning groove 221 and prevents the positioning ball 5 from being squeezed and deformed.

[0049] Example 2

[0050] Example 2 is a further improvement based on Example 1.

[0051] Unlike Example 1, please refer to Figures 1-9 An auxiliary groove 15 is provided between two adjacent guide holes 12 on the lower mold 1, and a connecting hole 16 is provided inside the lower mold 1. The connecting hole 16 is used to connect the innermost side of the sliding groove 14 with the bottom end of the auxiliary groove 15. A top post 6 is slidably and sealed inside the auxiliary groove 15, and the top end of the top post 6 extends out of the auxiliary groove 15. The auxiliary groove 15 and the connecting hole 16 at the bottom end of the top post 6 are filled with gas. An upper fly edge groove 24 is provided on the lower end face of the upper mold 2, and the upper fly edge groove 24 is provided with the upper fly edge groove 24. The two ends of the side groove 24 are connected to the upper cavity 21. The upper end face of the lower mold 1, which is directly above the auxiliary groove 15, is provided with a lower flash groove 17. The two ends of the lower flash groove 17 are connected to the lower cavity 11 of the lower mold 1. The top end of the top post 6 is also provided with a lower flash groove 17. When the top post 6 slides into the auxiliary groove 15 as a whole, the groove formed by the lower flash groove 17 on the upper end face of the lower mold 1 and the lower flash groove 17 on the top end of the top post 6 corresponds to the upper flash groove 24 of the upper mold 2.

[0052] When using a mold to produce automotive rubber seals, the upper mold 2 compresses the support spring 34, causing the support spring 34 to push the lower pressure plate 32 downward. At the same time, the lower pressure plate 32 rotates synchronously, and the rotating lower pressure plate 32 pushes the slider 31 to move towards the axis of the annular groove 13. At this time, the slider 31, which slides outward of the sliding groove 14, expands the volume inside the sliding groove 14. The pressure of the gas in the auxiliary groove 15, the connecting hole 16 and the sliding groove 14 decreases. When the upper mold 2 compresses the top post 6, the impact force between the upper end face of the top post 6 and the lower end face of the upper mold 2 is reduced.

[0053] After the rubber sealing ring is formed, the upper mold 2 and the lower mold 1 are opened. Since the support spring 34 is no longer squeezed by the upper mold 2, the elastic force of the elastic pad 35 pushes the lower pressure plate 32 and the support spring 34 to move upward. The lower pressure plate 32 is guided by the spiral column 33 to rotate synchronously. The spiral groove 321 at the bottom of the rotating lower pressure plate 32 pushes the slider 31 to move into the sliding groove 14. The slider 31 moving into the sliding groove 14 squeezes the gas in the sliding groove 14, increasing the gas pressure in the sliding groove 14. As a result, the gas in the sliding groove 14 enters the auxiliary groove 15 through the connecting hole 16. The gas entering the auxiliary groove 15 pushes the top column 6 in the auxiliary groove 15 to move upward. The upward-moving top column 6 lifts the rubber in the lower flash groove 17, thereby assisting in the demolding of the formed rubber sealing ring. The position where the formed rubber sealing ring is lifted is the demolding port, which is convenient for subsequent workers to pull and prevents the formed rubber sealing ring from sticking to the lower cavity 11 and being difficult to remove.

[0054] It should be noted that the diameter of the top of the top post 6 is greater than the width of the lower flash groove 17. When the upper mold 2 moves down, it can squeeze the top post 6, so that the top post 6 slides into the auxiliary groove 15 as a whole, ensuring that the lower flash groove 17 on the upper surface of the lower mold 1 and the lower flash groove 17 on the upper end of the top post 6 form a complete groove.

[0055] Furthermore, an auxiliary groove 15, a connecting hole 16, and a lower flash groove 17 can be provided between every two adjacent guide holes 12 on the lower mold 1. The auxiliary groove 15 is provided with a top post 6 and multiple sets of auxiliary rubber sealing ring demolding components, which facilitates the rubber sealing ring to be pulled off from all sides in sequence, preventing the formed rubber sealing ring from being torn due to excessive pulling force on one side.

[0056] A molding method for an automotive rubber seal ring mold includes the following steps:

[0057] S1. Install the lower mold 1 and the upper mold 2 onto the vulcanizing machine;

[0058] S2. During production, the rubber strip is placed in the lower cavity 11 of the lower mold 1. The vulcanizing machine closes the lower mold 1 and the upper mold 2. During the downward movement of the upper mold 2, the downward-moving upper mold 2 first contacts the support spring 34. The support spring 34 provides a gradual resistance to the upper mold 2, which transforms the hard impact when the upper mold 2 and the lower mold 1 are attached into an elastic impact, reducing the damage from the rigid impact when the upper mold 2 and the lower mold 1 are attached.

[0059] S3. When the support spring 34 is squeezed by the upper mold 2, the support spring 34 is compressed. The elastic force of the support spring 34 pushes the lower pressure plate 32 at the lower end to move down, and the lower pressure plate 32 rotates along the direction of the spiral column 33. The spiral groove 321 at the bottom of the rotating lower pressure plate 32 pushes the slider 31 to move to the side wall of the guide post 22 of the upper mold 2. Multiple sliders 31 squeeze the guide post 22 at the same time, so that the axis of the guide post 22 is on the same straight line as the axis of the guide hole 12 and the annular groove 13. Multiple sets of alignment mechanisms 3 simultaneously position multiple guide posts 22 at the lower end of the upper mold 2, thereby ensuring that the lower cavity 11 of the lower mold 1 is aligned with the upper cavity 21 of the upper mold 2, and avoiding the phenomenon of misalignment between the lower cavity 11 and the upper cavity 21 due to wear between the guide hole 12 of the lower mold 1 and the guide post 22 of the upper mold 2.

[0060] S4. When the slider 31 moves toward the axis of the annular groove 13, the positioning ball 5 on the slider 31 moves synchronously with the slider 31. The bottom end of the positioning ball 5 rubs against the friction strip 4. The friction between the bottom end of the positioning ball 5 and the friction strip 4 drives the positioning ball 5 to rotate. Impurities on the rotating positioning ball 5 are scraped off by the side wall of the slider 31, thereby preventing the appearance of debris that falls off the rubber sealing ring during material feeding on the positioning ball 5, which would cause abnormal wear on the positioning ball 5 and the positioning groove 221 of the guide post 22, thus avoiding positioning errors caused by abnormal wear.

[0061] S5. As the lower pressure plate 32 pushes the slider 31 to move towards the axis of the annular groove 13, the slider 31, which slides to the outside of the sliding groove 14, expands the volume inside the sliding groove 14. The pressure of the gas in the auxiliary groove 15, the connecting hole 16 and the sliding groove 14 decreases. When the top post 6 is squeezed on the lower end face of the upper mold 2, the impact force between the upper end face of the top post 6 and the lower end face of the upper mold 2 is reduced.

[0062] S6. After the rubber sealing ring is formed, the upper mold 2 and the lower mold 1 are opened. Since the support spring 34 is no longer squeezed by the upper mold 2, the elastic force of the elastic pad 35 pushes the lower pressure plate 32 to reset, and the spiral groove 321 at the bottom of the lower pressure plate 32 pushes the slider 31 to move into the sliding groove 14. The moving slider 31 squeezes the gas in the sliding groove 14, so that the gas in the sliding groove 14 enters the auxiliary groove 15 through the connecting hole 16, pushing the top post 6 in the auxiliary groove 15 to move upward. The upward-moving top post 6 lifts the rubber in the lower flash groove 17, thereby assisting the demolding of the formed rubber sealing ring. The position where the formed rubber sealing ring is lifted is the demolding port, which is convenient for subsequent workers to pull and prevent the formed rubber sealing ring from sticking to the lower cavity 11 and being difficult to remove.

Claims

1. A molding die for forming automotive rubber seal rings, comprising a lower die (1) and an upper die (2), wherein the lower die (1) has a lower cavity (11) and a guide hole (12), and the upper die (2) has an upper cavity (21) and a guide post (22), characterized in that: The guide hole (12) has an annular groove (13) on its sidewall, and a plurality of sliding grooves (14) are provided on the sidewall of the annular groove (13). An alignment mechanism (3) is provided in the annular groove (13) and the sliding grooves (14). The alignment mechanism (3) includes: The slider (31) is slidably sealed at one end and installed in the sliding groove (14); The spiral column (33) is fixedly installed on the inner wall of the annular groove (13); The lower pressure plate (32) is slidably installed in the annular groove (13). The side wall of the lower pressure plate (32) is provided with a snap-fit ​​groove (322), which is snapped onto the spiral column (33). The bottom end of the lower pressure plate (32) is provided with a spiral groove (321), which is snapped onto the upper end face of the slider (31) extending into the annular groove (13). A support spring (34) is fixedly connected to the upper end face of the lower pressure plate (32); Several elastic pads (35) are fixedly installed at the bottom end of the annular groove (13), and their top ends are located below the lower end face of the pressure plate (32).

2. The automotive rubber sealing ring molding die according to claim 1, characterized in that: A plurality of ball bearings I (351) are embedded in the top of the elastic pad (35), and the ball bearings I (351) at the top of the elastic pad (35) rest on the lower end face of the pressure plate (32).

3. The automotive rubber sealing ring molding die according to claim 2, characterized in that: The minimum number of sliding grooves (14) and sliders (31) is three.

4. The automotive rubber sealing ring molding die according to claim 2, characterized in that: The top end of the support spring (34) is fixedly connected to a support ring (36), and the upper end face of the support ring (36) is embedded with a number of ball bearings II (361). The lower end face of the upper mold (2) and the position outside the guide post (22) are provided with a storage groove (23).

5. The automotive rubber seal ring molding die according to claim 4, characterized in that: A limiting block (131) is fixedly installed on the inner wall of the annular groove (13), and the limiting block (131) is in close contact with the upper end face of the lower pressure plate (32).

6. The automotive rubber seal ring molding die according to claim 4, characterized in that: The lower end face of the slider (31) is provided with an installation groove (311). A friction strip (4) is fixedly installed at the bottom end of the sliding groove (14). The friction strip (4) is slidably installed in the installation groove (311) of the slider (31). A positioning ball (5) is embedded at one end of the slider (31) pointing to the axis of the ring groove (13). The lower end of the positioning ball (5) is in contact with the friction strip (4). Several positioning grooves (221) are provided on the side wall of the guide post (22) of the upper mold (2).

7. The automotive rubber seal ring molding die according to claim 6, characterized in that: The radius of the groove (221) on the guide post (22) is the same as the radius of the positioning ball (5) on the slider (31).

8. The automotive rubber seal ring molding die according to claim 6, characterized in that: The lower mold (1) is provided with an auxiliary groove (15), and a connecting hole (16) is provided inside the lower mold (1). The connecting hole (16) connects the sliding groove (14) and the auxiliary groove (15). A top post (6) is slidably and sealed inside the auxiliary groove (15). An upper flash groove (24) is provided on the lower end face of the upper mold (2). A lower flash groove (17) is provided on the upper end face of the lower mold (1) directly above the auxiliary groove (15). A lower flash groove (17) is provided on the top of the top post (6).

9. The automotive rubber seal ring molding die according to claim 8, characterized in that: The diameter of the top of the top post (6) is greater than the width of the lower edge groove (17).

10. The molding method of an automotive rubber sealing ring molding die according to claim 8, characterized in that: Includes the following steps: S1. During production, the rubber strip is placed in the lower cavity (11) of the lower mold (1). The vulcanizing machine closes the lower mold (1) and the upper mold (2). During the process of the upper mold (2) moving down, the moving upper mold (2) first contacts the support spring (34). The support spring (34) provides a gradual resistance to the upper mold (2), converting the hard impact when the upper mold (2) and the lower mold (1) are in contact into an elastic impact. S2. When the support spring (34) is squeezed by the upper mold (2), the support spring (34) is compressed. The elastic force of the support spring (34) pushes the lower pressure plate (32) at the lower end to move down, and the lower pressure plate (32) rotates along the direction of the spiral column (33). The spiral groove (321) at the bottom of the rotating lower pressure plate (32) pushes the slider (31) to move to the side wall of the guide post (22) of the upper mold (2). Multiple sliders (31) squeeze the guide post (22) at the same time, so that the axis of the guide post (22) is on the same straight line as the axis of the guide hole (12) and the annular groove (13). S3. When the slider (31) moves toward the axis of the annular groove (13), the positioning ball (5) on the slider (31) moves synchronously with the slider (31). The bottom end of the positioning ball (5) rubs against the friction strip (4). The friction between the bottom end of the positioning ball (5) and the friction strip (4) drives the positioning ball (5) to rotate. The impurities on the rotating positioning ball (5) are scraped off by the side wall of the slider (31). S4. As the lower pressure plate (32) pushes the slider (31) to move toward the axis of the ring groove (13), the slider (31) sliding to the outside of the sliding groove (14) expands the volume inside the sliding groove (14), and the pressure of the gas in the auxiliary groove (15), the connecting hole (16) and the sliding groove (14) decreases. When the top post (6) is squeezed on the lower end face of the upper mold (2), the impact force between the upper end face of the top post (6) and the lower end face of the upper mold (2) is reduced. S5. After the rubber sealing ring is formed, the upper mold (2) and the lower mold (1) are opened. Since the support spring (34) is no longer squeezed by the upper mold (2), the elastic force of the elastic pad (35) pushes the lower pressure plate (32) to reset, and the spiral groove (321) at the bottom of the lower pressure plate (32) pushes the slider (31) to move into the sliding groove (14). The moving slider (31) squeezes the gas in the sliding groove (14), so that the gas in the sliding groove (14) enters the auxiliary groove (15) through the connecting hole (16), pushing the top column (6) in the auxiliary groove (15) to move upward. The upward-moving top column (6) lifts the rubber in the lower flash groove (17).

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