Forming die and forming method of inner hexagonal polyether-ether-ketone spacer bush

Abstract

The invention relates to the technical field of spacer bush forming dies, in particular to a forming die and a forming method of an inner hexagonal polyether-ether-ketone spacer bush, which comprises a base, a rack arranged on the base, a lower die arranged on the base, an air cylinder arranged on the rack, a movable frame arranged on an output piston rod of the air cylinder, and an upper die arranged at the bottom of the movable frame. A support is arranged on the base, and a vacuumizing mechanism used for exhausting air in the lower die is arranged on the base; the vacuum pumping mechanism comprises a piston cylinder fixed to the base, the piston cylinder communicates with the lower mold through a hose, and a piston rod is movably connected to the piston cylinder in an inserted mode. Air in the lower mold is pumped through negative pressure to vacuumize the lower mold before injection molding of the inner hexagonal polyether-ether-ketone spacer bush, so that the interior of the lower mold is in a vacuum state; and residual air in the lower mold can be prevented from entering the injection molding liquid to generate bubbles in the injection molding liquid, so that the injection molding quality of the inner hexagonal polyether-ether-ketone spacer bush is effectively improved, and the qualification rate of spacer bush products is improved.

Description

Technical Field

[0001] The invention relates to the technical field of spacer sleeve forming dies, in particular to a forming die for a hexagonal polyetheretherketone spacer and a forming method thereof. Background Art

[0002] Polyetheretherketone (PEEK) is a repeating unit composed of oxygen-1, 4-phenylene-oxy-1, 4-phenylene-carbonyl-1, 4-phenylene. It is a semi-crystalline aromatic polymer. It is a special engineering plastic with excellent properties such as high temperature resistance, self-lubrication, easy processing and high mechanical strength. It can be manufactured and processed into various mechanical parts, such as automobile gears, oil screens, shift starter discs; aircraft engine parts, automatic washing machine wheels, medical equipment parts, etc. Although this special engineering plastic is a super heat-resistant resin, it still has relatively excellent high-temperature fluidity and high thermal decomposition temperature. The processing and production of hexagonal polyetheretherketone spacers can be formed by injection molding, and the final product is made by a specially designed mold.

[0003] In the process of realizing this application, the applicant found that the relevant technology has the following problems: the melting point of polyetheretherketone material is higher than that of ordinary plastics, and the fluidity during the molding process is poor. If there is air in the molding cavity when the injection liquid enters the molding cavity, the air will enter the injection liquid and form bubbles in the injection liquid, which will eventually reduce the qualified rate of the spacer product. For this reason, we propose a molding mold and a molding method of a hexagonal polyetheretherketone spacer to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a molding die and a molding method for a hexagonal polyetheretherketone spacer, so as to solve the problem proposed in the above background technology that the melting point of the polyetheretherketone material is higher than that of ordinary plastics, the fluidity during the molding process is poor, and if there is air in the molding cavity when the injection liquid enters the molding cavity, the air will enter the injection liquid and form bubbles in the injection liquid, which will eventually reduce the qualified rate of the spacer product.

[0005] To achieve the above object, the present invention provides the following technical solutions: A forming die for a hexagonal polyetheretherketone spacer, comprising a base, a frame is arranged on the base, a lower die is arranged on the base, a cylinder is arranged on the frame, a movable frame is arranged on the output piston rod of the cylinder, an upper die is arranged at the bottom of the movable frame, a bracket is arranged on the base, and a vacuum pumping mechanism for pumping air inside the lower die is arranged on the base; The vacuum pumping mechanism comprises a piston cylinder fixed on the base, the piston cylinder is connected to the lower mold through a hose, a piston rod is movably inserted on the piston cylinder, and a piston is provided on the piston rod and is slidably connected to the inside of the piston cylinder; The piston rod and the movable frame are connected by a linkage structure. When the movable frame moves down to the upper surface of the lower mold, it will drive the piston rod to move down, and the lower mold will be evacuated by the downward movement of the piston. At the same time, when the movable frame moves up, it will drive the piston rod to move up and then drive the piston to move up and reset.

[0006] The molding die of the hexagonal polyetheretherketone spacer as described above: a sealing gasket is also provided on the upper surface of the sealing gasket, and the sealing gasket is used to seal between the upper mold and the lower mold when the upper mold and the lower mold are in contact.

[0007] A molding die for a hexagonal polyetheretherketone spacer as described above: an injection liquid inlet pipe is installed on the lower die, the injection liquid inlet pipe is connected to an external injection molding machine, and the injection liquid inlet pipe is used to feed material into the lower die.

[0008] A molding die for a hexagonal polyetheretherketone spacer as described above: the linkage structure includes a bracket fixed on a base, a fixed arm is provided on the bracket, a swingable swing arm is hinged on the fixed arm, a spring is connected between the fixed arm and the swing arm, a hinged rod is provided between the swing arm and the piston rod, both ends of the hinged rod are hinged to the swing arm and the piston rod respectively, a connecting rod is provided on the swing arm, a base frame is provided at the bottom of the movable frame, and a lifting rod for lifting the connecting rod upwards is provided on the base frame.

[0009] A forming mold for a hexagonal polyetheretherketone spacer as described above: blocks are respectively arranged on the fixed arm and on both sides of the hinged rod, and the blocks are used to limit the two sides when the hinged rod is rotated, and the hinged rod swings within the angle range formed between the two blocks.

[0010] A molding die for a hexagonal polyetheretherketone spacer as described above: a protrusion is installed on the upper surface of the swing arm.

[0011] A molding die for a hexagonal polyetheretherketone spacer as described above: a steam hose valve is installed on one end of the hose close to the sealing gasket, and the steam hose valve allows gas to flow in the hose but does not allow liquid to flow from the sealing gasket into the hose.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: when the hexagonal polyetheretherketone spacer is injection-molded, the cylinder is started to drive the movable frame to move downward, driving the upper mold to move downward to the upper end of the lower mold to seal the lower mold; then when the upper mold moves to the upper end of the lower mold, the piston rod moves downward to drive the piston to move downward in the piston cylinder, and the air in the lower mold is extracted by negative pressure to evacuate the lower mold; then the injection molding machine injects the injection liquid into the lower mold through the injection liquid inlet pipe, and after the hexagonal polyetheretherketone spacer is injection-molded, the cylinder is started to drive the movable frame to move upward to drive the upper mold to separate from the upper end of the lower mold, thereby facilitating the removal of the hexagonal polyetheretherketone spacer formed in the lower mold; Furthermore, the present invention has the following beneficial effects. Before the injection molding of the hexagonal polyetheretherketone spacer, the air in the lower mold is extracted by negative pressure to evacuate the lower mold, so that the interior of the lower mold reaches a vacuum state. After the injection molding liquid is injected into the lower mold, the residual air in the lower mold can be prevented from entering the injection molding liquid and generating bubbles in the injection molding liquid, thereby effectively improving the injection molding quality of the hexagonal polyetheretherketone spacer and improving the qualified rate of the spacer products. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a first-view structural schematic diagram of a molding die and a molding method of a hexagonal polyetheretherketone spacer.

[0014] Figure 2 The present invention is a second-view structural schematic diagram of a molding die and a molding method of a hexagonal polyetheretherketone spacer.

[0015] Figure 3 The present invention is a third-view structural schematic diagram of a molding die and a molding method of a hexagonal polyetheretherketone spacer.

[0016] Figure 4 The present invention is a partial structural schematic diagram of a molding die for a hexagonal polyetheretherketone spacer and a molding method thereof.

[0017] Figure 5 for Figure 4 A schematic diagram of the structure from another perspective.

[0018] Figure 6 for Figure 4 Schematic diagram of the top view structure.

[0019] Figure 7 The present invention is a schematic diagram of the matching structure of a swing arm and a lifting rod of a forming die and a forming method of a hexagonal polyetheretherketone spacer.

[0020] Figure 8 The invention is a schematic diagram of the exploded structure of a linkage structure of a forming die for a hexagonal polyetheretherketone spacer and a forming method thereof.

[0021] Fig. 9 The present invention is a partial structural schematic diagram of the linkage structure of a forming die for a hexagonal polyetheretherketone spacer and a forming method thereof.

[0022] In the figure: 1. base; 2. frame; 3. cylinder; 4. movable frame; 5. upper mold; 6. lower mold; 7. sealing gasket; 8. injection liquid inlet pipe; 9. bracket; 10. fixed arm; 11. swing arm; 12. spring; 13. hinged rod; 14. connecting rod; 15. piston cylinder; 16. piston rod; 17. piston; 18. hose; 19. stopper; 20. protrusion; 21. base frame; 22. lifting rod. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] See also Figures 1 to 9 As an embodiment of the present invention, a forming die and forming method of a hexagonal polyetheretherketone spacer, comprising a base 1, a frame 2 is arranged on the base 1, a lower die 6 is arranged on the base 1, a cylinder 3 is arranged on the frame 2, a movable frame 4 is arranged on the output piston rod of the cylinder 3, an upper die 5 is arranged at the bottom of the movable frame 4, a bracket 9 is arranged on the base 1, and a vacuum pumping mechanism for pumping air inside the lower die 6 is arranged on the base 1; The vacuum mechanism includes a piston cylinder 15 fixed on the base 1, the piston cylinder 15 is connected to the lower mold 6 through a hose 18, a piston rod 16 is movably inserted on the piston cylinder 15, and a piston 17 is provided on the piston rod 16 and is slidably connected to the inside of the piston cylinder 15; The piston rod 16 and the movable frame 4 are connected by a linkage structure. When the movable frame 4 moves down to the upper surface of the lower mold 6, it will drive the piston rod 16 to move down, and the piston 17 will move down to evacuate the inside of the lower mold 6. At the same time, when the movable frame 4 moves up, it will drive the piston rod 16 to move up and then drive the piston 17 to move up and reset.

[0025] In this embodiment, when the hexagonal polyetheretherketone spacer is injection molded, the cylinder 3 is started to drive the movable frame 4 to move downward, driving the upper mold 5 to move downward to the upper end of the lower mold 6 to seal the lower mold 6; then when the upper mold 5 moves to the upper end of the lower mold 6, the piston rod 16 moves downward to drive the piston 17 to move downward in the piston cylinder 15, and the air in the lower mold 6 is extracted by negative pressure to vacuum the lower mold 6; then the injection molding machine injects molding liquid into the lower mold 6, and after the hexagonal polyetheretherketone spacer is injection molded, the cylinder 3 is started to drive the movable frame 4 to move upward to drive the upper mold 5 to separate from the upper end of the lower mold 6, thereby facilitating the removal of the hexagonal polyetheretherketone spacer formed in the lower mold 6.

[0026] As a further solution of the present invention, a sealing gasket 7 is further provided on the upper surface of the sealing gasket 7 , and the sealing gasket 7 is used to seal between the upper mold 5 and the lower mold 6 when the upper mold 5 and the lower mold 6 are in contact.

[0027] In this embodiment, the sealing gasket 7 is made of rubber, which is soft and elastic. On the one hand, the sealing gasket 7 can seal the upper mold 5 and the lower mold 6. On the other hand, the sealing gasket 7 can elastically expand and contract, so that when the upper mold 5 contacts the lower mold 6, the upper mold 5 still has space to continue to move downward slightly.

[0028] As a further solution of the present invention, an injection liquid inlet pipe 8 is installed on the lower mold 6 , and the injection liquid inlet pipe 8 is connected to an external injection molding machine. The injection liquid inlet pipe 8 is used to feed material into the lower mold 6 .

[0029] In this embodiment, after the upper mold 5 contacts the lower mold 6 and seals the lower mold 6 through the upper mold 5, the external injection molding machine can be turned on and the injection liquid pipe 8 is used to inject the injection liquid into the lower mold 6 so that the injection liquid is injection molded inside the lower mold 6.

[0030] As a further solution of the present invention, the linkage structure includes a bracket 9 fixed on the base 1, a fixed arm 10 is provided on the bracket 9, a swingable swing arm 11 is hinged on the fixed arm 10, a spring 12 is connected between the fixed arm 10 and the swing arm 11, a hinged rod 13 is provided between the swing arm 11 and the piston rod 16, two ends of the hinged rod 13 are respectively hinged to the swing arm 11 and the piston rod 16, a connecting rod 14 is provided on the swing arm 11, a bottom frame 21 is provided at the bottom of the movable frame 4, and a lifting rod 22 for lifting the connecting rod 14 upward is provided on the bottom frame 21; Stoppers 19 are provided on the fixed arm 10 and on both sides of the hinged rod 13 . The stoppers 19 are used to limit the two sides when the hinged rod 13 is rotated. The hinged rod 13 swings within the angle range formed between the two stoppers 19 .

[0031] In this embodiment, when the upper mold 5 moves to the upper surface of the lower mold 6 and contacts the upper end of the lower mold 6, the movable frame 4 is on the same horizontal line with the fixed arm 10, thereby driving the swing arm 11 to swing clockwise and press the swing arm 11 down to the same horizontal line with the fixed arm 10. Since the sealing gasket 7 can be elastically retracted, when the upper mold 5 contacts the lower mold 6, the upper mold 5 still has a small space to continue to move downward, so that the movable frame 4 still has a small space to continue to move downward, so that the movable frame 4 continues to drive the upper mold 5 to press down, so that the swing arm 11 just passes below the horizontal line where the fixed arm 10 is located, so that under the elastic force of the spring 12, the swing arm 11 is driven to rotate clockwise and swing downward until it contacts the stopper 19 and stops rotating after being limited by the stopper 19, and the swing arm 11 When it swings clockwise, it drives the hinge rod 13 to swing, thereby driving the piston rod 16 to move downward, thereby driving the piston 17 to move downward in the piston cylinder 15, and using the negative pressure to extract the air in the lower mold 6 to evacuate the lower mold 6. In addition, after injection molding, the upward movement of the movable frame 4 will drive the upper mold 5 to separate from the lower mold 6, and when the movable frame 4 moves upward, it will drive the base frame 21 and the lifting rod 22 to move upward. When the lifting rod 22 moves upward, it will contact the connecting rod 14 at one end of the swing arm 11, and support the connecting rod 14 to move upward, thereby supporting the swing arm 11 to rotate counterclockwise, until the swing arm 11 rotates to the level of the fixed arm 10 and continues to support upward, under the action of the elastic force of the spring 12, the swing arm 11 is pulled to rotate counterclockwise until it contacts the stop block 19 and stops rotating after passing through the stop block 19 to complete the reset.

[0032] It should be noted that the position of an end point of the lifting rod 22 close to the swing arm 11 can be designed to be within the distance between the two points formed by the swing arm 11 swinging to the bottom of the fixed arm 10 and the swing arm 10 respectively. When the swing arm 11 and the fixed arm 10 are on the same horizontal line, the spring 12 is in the maximum stretched state and in a balanced state. At this time, when the swing arm 11 rotates a little upward or downward, the spring 12 will quickly pull the swing arm 11 to rotate counterclockwise or clockwise.

[0033] As a further solution of the present invention, a protrusion 20 is installed on the upper surface of the swing arm 11 .

[0034] In this embodiment, when the upper mold 5 moves to the upper surface of the lower mold 6 and contacts the upper end of the lower mold 6, the movable frame 4 is on the same horizontal line with the fixed arm 10, thereby driving the swing arm 11 to swing clockwise and pressing the swing arm 11 down to the same horizontal line as the fixed arm 10. Since the upper surface of the swing arm 11 is equipped with a protrusion 20, the movable frame 4 is on the same horizontal line with the fixed arm 10, and the swing arm 11 is also pressed to the same horizontal line as the fixed arm 10. Since the upper surface of the swing arm 11 is equipped with a protrusion 20, the swing arm 11 can be further squeezed downward by a small amplitude, so that the swing arm 11 passes the same horizontal line as the fixed arm 10, thereby cooperating with the spring 12 to instantly pull the swing arm 11 in the clockwise direction.

[0035] As a further solution of the present invention, a steam hose valve is installed on one end of the hose 18 close to the sealing gasket 7 , and the steam hose valve allows gas to flow in the hose 18 but does not allow liquid to flow from the sealing gasket 7 into the hose 18 .

[0036] In this embodiment, the steam hose valve allows gas to flow in the hose 18, but does not allow liquid to flow from the sealing gasket 7 to the hose 18, so that the injection liquid will not enter the piston cylinder 15 through the hose 18 after entering the lower mold 6 through the injection liquid inlet pipe 8, and the steam hose valve on the hose 18 can also ensure that the gas can flow freely between the lower mold 6 and the piston cylinder 15.

[0037] The working principle of the invention is: when the hexagonal polyetheretherketone spacer is injection-molded, the cylinder 3 is started to drive the movable frame 4 to move downward, driving the upper mold 5 to move downward to the upper end of the lower mold 6 to seal the lower mold 6; then when the upper mold 5 moves to the upper end of the lower mold 6, the linkage structure drives the piston rod 16 to move downward and drives the piston 17 to move downward in the piston cylinder 15, and the air in the lower mold 6 is extracted by negative pressure to vacuum the lower mold 6; then the injection molding machine injects the injection liquid into the lower mold 6 through the injection liquid inlet pipe 8, and after the hexagonal polyetheretherketone spacer is injection-molded, the cylinder 3 is started to drive the movable frame 4 to move upward to drive the upper mold 5 to separate from the upper end of the lower mold 6, thereby facilitating the removal of the hexagonal polyetheretherketone spacer formed in the lower mold 6.

[0038] The above embodiments are exemplary rather than restrictive, so the technical solutions of the present invention that can be implemented in other specific forms without departing from the spirit or basic features of the present invention are all included in the present invention.

Claims

1. A molding die for a hexagonal polyetheretherketone spacer, comprising a base (1), a frame (2) being arranged on the base (1), characterized in that: The base (1) is provided with a lower mold (6), the frame (2) is provided with a cylinder (3), the output piston rod of the cylinder (3) is provided with a movable frame (4), the bottom of the movable frame (4) is provided with an upper mold (5), the base (1) is provided with a bracket (9), and the base (1) is provided with a vacuum pumping mechanism for pumping air inside the lower mold (6); The vacuum extraction mechanism comprises a piston cylinder (15) fixed on the base (1), the piston cylinder (15) and the lower mold (6) are connected via a hose (18), a piston rod (16) is movably connected to the piston cylinder (15), and the piston rod (16) is provided with a piston (17) which is slidably connected to the inside of the piston cylinder (15); The piston rod (16) and the movable frame (4) are connected via a linkage structure. When the movable frame (4) moves downward to the upper surface of the lower mold (6), it drives the piston rod (16) to move downward, and the piston (17) moves downward to evacuate the interior of the lower mold (6). At the same time, when the movable frame (4) moves upward, it drives the piston rod (16) to move upward and then drives the piston (17) to move upward and reset.

2. The forming die of the hexagonal polyetheretherketone spacer according to claim 1, characterized in that: A sealing gasket (7) is also provided on the upper surface of the lower mold (6), and the sealing gasket (7) is used to seal between the upper mold (5) and the lower mold (6) when the upper mold (5) and the lower mold (6) are in contact.

3. The forming die of the hexagonal polyetheretherketone spacer according to claim 1, characterized in that: The lower mold (6) is provided with an injection liquid inlet pipe (8), the injection liquid inlet pipe (8) is connected to an external injection molding machine, and the injection liquid inlet pipe (8) is used to feed material into the lower mold (6).

4. The forming die of the hexagonal polyetheretherketone spacer according to claim 1, characterized in that: The linkage structure comprises a bracket (9) fixed on a base (1), the bracket (9) being provided with a fixed arm (10), the fixed arm (10) being hinged with a swingable swing arm (11), a spring (12) being connected between the fixed arm (10) and the swing arm (11), a hinged rod (13) being provided between the swing arm (11) and a piston rod (16), the two ends of the hinged rod (13) being respectively hinged with the swing arm (11) and the piston rod (16), a connecting rod (14) being provided on the swing arm (11), a bottom frame (21) being provided at the bottom of the movable frame (4), and a lifting rod (22) being provided on the bottom frame (21) for lifting the connecting rod (14) upwards.

5. The forming die of the hexagonal polyetheretherketone spacer according to claim 4, characterized in that: Stoppers (19) are provided on the fixed arm (10) and on both sides of the hinged rod (13), respectively. The stoppers (19) are used to limit the positions of the two sides when the hinged rod (13) is rotated. The hinged rod (13) swings within an angle range formed between the two stoppers (19).

6. The forming die of the hexagonal polyetheretherketone spacer according to claim 4, characterized in that: A protrusion (20) is mounted on the upper surface of the swing arm (11).

7. The forming die of the hexagonal polyetheretherketone spacer according to claim 1, characterized in that: A steam hose valve is installed on one end of the hose (18) close to the sealing gasket (7), and the steam hose valve allows gas to flow in the hose (18) but does not allow liquid to flow from the sealing gasket (7) into the hose (18).

8. A method for forming a forming mold for a hexagonal polyetheretherketone spacer according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, start the cylinder (3) to drive the movable frame (4) to move downward, driving the upper mold (5) to move downward to the upper end of the lower mold (6) to seal the lower mold (6); S2, when the upper mold (5) moves to the upper end of the lower mold (6), the piston rod (16) moves downward to drive the piston (17) to move downward in the piston cylinder (15), and the air in the lower mold (6) is extracted by negative pressure to evacuate the lower mold (6); S3, the injection molding machine injects the injection liquid into the lower mold (6) through the injection liquid inlet pipe (8), and after the hexagonal polyetheretherketone spacer is injection-molded, the cylinder (3) is started to drive the movable frame (4) to move upward and drive the upper mold (5) to separate from the upper port of the lower mold (6), and the hexagonal polyetheretherketone spacer formed in the lower mold (6) is taken out.

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