Mold for forming a car pedal that prevents premature curing

Abstract

The present application relates to injection mold technical field, aiming at the record groove phenomenon caused by too low injection speed in the ABS material injection molding process of automobile foot pedal, specifically relates to a forming mold based on automobile foot pedal production can prevent premature solidification, the pin stopper for controlling the flow section of the runner is arranged on the male die fixing plate, the sprue bushing is arranged on the upper die seat, the sprue bushing penetrates the upper die seat and the female die plate in turn, the discharge port of the sprue bushing is communicated with the runner when the male die fixing plate and the female die plate are closed, the inside of the sprue bushing is provided with a flow increasing channel, the inside of the sprue bushing is also provided with a hydraulic control mechanism for controlling the on-off of the pin stopper station and the flow increasing channel, the application increases the flow section of the injected raw materials by the mode that the pin stopper exits the runner and the sprue bushing is provided with a flow increasing channel, thereby increasing the flow of the injected raw materials, the poor flowability of the raw materials in the injection molding process is solved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically to a molding die for producing automotive pedals that can prevent premature curing. Background Technology

[0002] Car pedals include side pedals for passengers to get in and out of the car, as well as control pedals for the driver to operate the vehicle. Regardless of their purpose, pedals are generally made of metal and plastic through injection molding.

[0003] The plastic material chosen for the pedals in automobiles is usually ABS plastic. ABS plastic is a terpolymer of acrylonitrile (A), butadiene (B), and styrene (S). It is an opaque, ivory-colored granule, non-toxic, odorless, and has low water absorption. Its products can be colored in various colors and have a high gloss of 90%. In addition, ABS plastic has high impact resistance, high heat resistance, and flame retardancy, making it suitable for manufacturing general mechanical parts, wear-resistant and friction-reducing parts, transmission parts, and telecommunications parts.

[0004] However, due to the poor fluidity of ABS material during injection molding, if the melt in contact with the mold surface solidifies too quickly during the injection process—especially under low injection speed conditions—the flow resistance will be too high, resulting in distortion at the fluid front end. The solidified outer layer material will not fully contact the mold cavity wall and will form a wavy shape, commonly known as record texture. These wavy materials will freeze, and holding pressure will no longer be able to smooth them out.

[0005] To address the issue of record-like patterns caused by excessively low injection speeds during the injection molding of ABS materials for automotive pedals, a solution is needed that utilizes a molding die designed to prevent premature curing during automotive pedal production. Summary of the Invention

[0006] To solve the above technical problems.

[0007] This application provides a molding die for preventing premature curing in the production of automotive pedals, including a lower mold base, an upper mold base slidably disposed on the top of the lower mold base, a punch fixing plate fixedly disposed on the top of the lower mold base, a concave mold plate fixedly disposed on the bottom of the upper mold base, a molding cavity and a sprue are formed between the punch fixing plate and the concave mold plate when the mold is closed, the molding cavity and the sprue are connected, and an ejector assembly for ejecting the part is disposed at the bottom of the punch fixing plate, the ejector assembly being connected to the upper mold base;

[0008] The punch fixing plate is equipped with a stop pin for controlling the flow section of the sprue. The upper mold base is equipped with a sprue sleeve, which passes through the upper mold base and the concave mold plate in sequence. When the punch fixing plate and the concave mold plate are closed, the outlet of the sprue sleeve is connected to the sprue. The sprue sleeve is equipped with a flow boosting channel inside. The sprue sleeve is also equipped with a hydraulic control mechanism for controlling the stop pin position and the flow boosting channel opening and closing.

[0009] Preferably, the sprue bushing has an inner chamber with an inner diameter smaller than that of the sprue bushing. There is at least one flow-enhancing channel with inlet and outlet ports located above and below the inner chamber, respectively. The hydraulic control mechanism includes an actuator located between the inside of the sprue bushing and the outside of the inner chamber. The actuator controls the opening and closing of the stop pin station and the flow-enhancing channel by the fluid pressure passing through the sprue bushing. The hydraulic control mechanism also includes a pressure control element for controlling the control range of the actuator.

[0010] Preferably, the actuator includes a movable ring, which is disposed between the inside of the sprue sleeve and the outside of the inner chamber. The movable ring is sealed to both the inner chamber and the sprue sleeve. The movable ring is elastically connected to the inner chamber via a spring. Under normal conditions, the movable ring closes the inlet of the flow booster channel.

[0011] Preferably, the flow enhancement channels are located inside the wall of the gating sleeve, and the inlets of more than one flow enhancement channel should be staggered along the axis of the gating sleeve.

[0012] Preferably, the pressure control element includes a screw rod, which is rotatably disposed inside the pipe wall of the sprue sleeve. The screw rod is provided with a retaining ring for controlling the movement range of the movable ring, and the retaining ring is threadedly connected to the screw rod.

[0013] Preferably, the inner wall of the sprue sleeve is provided with a squeezing channel, which is connected to the flow boosting channel. The squeezing channel is provided with a piston rod. The hydraulic control mechanism also includes a discharge drive mechanism, and the movable ring is connected to the piston rod through the discharge drive mechanism.

[0014] Preferably, the discharge drive mechanism includes a movable rod, which is slidably disposed inside the pipe wall of the sprue sleeve. The top end of the movable rod is connected to the piston rod through a top plate. A vertical plate is provided on the movable ring, and several protruding teeth are provided on the vertical plate. Several tooth grooves are provided at the bottom end of the movable rod. The vertical plate and the movable rod are connected by gear transmission.

[0015] Preferably, the hydraulic control mechanism further includes a needle removal drive assembly, one end of which is connected to the movable ring drive, and several stop needles are fixedly installed at the other end of the needle removal drive assembly.

[0016] Preferably, the needle removal drive assembly includes a connecting plate, a slot is provided on the punch fixing plate, the connecting plate is slidably disposed inside the slot, a plurality of stop pins are distributed on the connecting plate, and the top of the stop pins penetrates the punch fixing plate and is located in the sprue, the connecting plate is elastically connected to the inside of the slot through a second spring, and the connecting plate is drivenly connected to the movable ring through an elastic sleeve rod.

[0017] Preferably, the inner wall of the sprue sleeve is provided with a sealing cavity, and the vertical plate is sealed to the sealing cavity.

[0018] The beneficial effects of this invention compared to the prior art are:

[0019] 1. This application increases the flow cross-section of the injected raw material by removing the gate pin and opening a liquid-increasing channel in the sprue sleeve, thereby increasing the flow rate of the injected raw material. This solves the problem that the melt solidification speed of raw materials with poor flowability is too fast when in contact with the mold surface during the injection molding process. Furthermore, by combining the back pressure and barrel temperature of the injection molding machine when injecting raw material, increasing the injection speed of raw material, increasing the mold temperature, and increasing the holding pressure, the injection effect of raw materials with poor flowability can be further improved.

[0020] 2. This application uses a driven piston rod to squeeze out the residual material inside the liquid filling channel when the mold is not in operation, so as to avoid the residual material inside the liquid filling channel from solidifying and causing the liquid filling channel to be unable to flow normally. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a three-dimensional exploded structural diagram of the present invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the punch fixing plate and the stop pin of the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the punch fixing plate, the stop pin, and the pin removal drive assembly of the present invention.

[0025] Figure 5 This is a three-dimensional structural diagram of the upper mold base, concave mold plate, sprue sleeve, and elastic sleeve of the present invention;

[0026] Figure 6 for Figure 5 Enlarged view of point A;

[0027] Figure 7 This is a three-dimensional structural diagram of the gating sleeve and hydraulic control mechanism of the present invention. Figure 1 ;

[0028] Figure 8This is a three-dimensional structural diagram of the gating sleeve and hydraulic control mechanism of the present invention. Figure 2 ;

[0029] Figure 9 This is a top view of the sprue sleeve and hydraulic control mechanism of the present invention;

[0030] Figure 10 for Figure 9 BB direction sectional view;

[0031] Figure 11 for Figure 10 A schematic diagram of the three-dimensional structure;

[0032] Figure 12 This is a side view of the gating sleeve and hydraulic control mechanism of the present invention;

[0033] Figure 13 for Figure 12 A cross-sectional view along the CC direction;

[0034] Figure 14 This is a front view of the sprue sleeve and hydraulic control mechanism of the present invention;

[0035] Figure 15 for Figure 14 DD-direction sectional view.

[0036] The numbers on the map are:

[0037] 1-Lower mold base; 11-Punch fixing plate; 12-Gateway;

[0038] 2-Upper mold base; 21-Diaphragm plate;

[0039] 3-Top-out component;

[0040] 4-Stop pin;

[0041] 5-Gating sleeve; 51-Flow enhancement channel; 52-Inner chamber; 53-Piston rod; 54-Sealing cavity;

[0042] 6-Actuating element; 61-Moving ring; 611-Upright plate; 612-Protruding tooth; 62-Sliding element; 63-First spring;

[0043] 7-Pressure control element; 71-Turn lever; 72-Retaining ring;

[0044] 8-Discharge drive mechanism; 81-Moving rod; 82-Top plate; 83-Gear; 84-Tension spring;

[0045] 9-Needle release drive assembly; 91-Connecting plate; 92-Second spring; 93-Elastic sleeve rod. Detailed Implementation

[0046] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0047] like Figures 1 to 15 As shown, the following preferred technical solutions are provided:

[0048] The molding die for preventing premature curing in the production of automotive foot pedals includes a lower mold base 1, an upper mold base 2 slidably disposed on the top of the lower mold base 1, a punch fixing plate 11 fixedly disposed on the top of the lower mold base 1, and a concave plate 21 fixedly disposed on the bottom of the upper mold base 2. When the punch fixing plate 11 and the concave plate 21 are closed, a molding cavity and a sprue 12 are formed between them. The molding cavity and the sprue 12 are connected. An ejector assembly 3 for ejecting the part is disposed at the bottom of the punch fixing plate 11. The ejector assembly 3 is connected to the upper mold base 2.

[0049] The punch fixing plate 11 is provided with a stop pin 4 for controlling the flow section of the sprue 12. The upper mold base 2 is provided with a sprue sleeve 5. The sprue sleeve 5 passes through the upper mold base 2 and the concave mold plate 21 in sequence. When the punch fixing plate 11 and the concave mold plate 21 are closed, the outlet of the sprue sleeve 5 is connected to the sprue 12. The sprue sleeve 5 is provided with a flow enhancement channel 51 inside. The sprue sleeve 5 is also provided with a hydraulic control mechanism for controlling the position of the stop pin 4 and the opening and closing of the flow enhancement channel 51.

[0050] The hydraulic control mechanism includes an actuator 6, a pressure control element 7, and a needle removal drive assembly 9;

[0051] The gating sleeve 5 has an inner chamber 52 inside, the inner diameter of which is smaller than that of the gating sleeve 5. The inlet and outlet of the flow boosting channel 51 are respectively arranged above and below the inner chamber 52. The flow boosting channel 51 is located inside the tube wall of the gating sleeve 5. There are two flow boosting channels 51, which are symmetrically arranged along the axis of the gating sleeve 5. The inlets of the two flow boosting channels 51 are staggered along the axis of the gating sleeve 5. The actuator 6 includes a movable ring 61, which is located between the inside of the gating sleeve 5 and the outside of the inner chamber 52. The movable ring 61 is sealed to the inner chamber 52 and the gating sleeve 5 respectively. The bottom of the movable ring 61 is provided with a sliding member 62. The two ends of the sliding member 62 penetrate into the tube wall of the gating sleeve 5 respectively. The bottom of the sliding member 62 is provided with a first spring 63. The sliding member 62 is elastically connected to the inner chamber 52 through the first spring 63. Under normal conditions, the movable ring 61 closes the inlet of the flow boosting channel 51.

[0052] The pressure control element 7 includes a screw rod 71, which is rotatably disposed inside the tube wall of the sprue sleeve 5. The screw rod 71 passes through one end of the sliding member 62. The screw rod 71 is provided with a retaining ring 72 for controlling the movement range of the movable ring 61. The retaining ring 72 is slidably disposed inside the tube wall of the sprue sleeve 5 and is threadedly connected to the screw rod 71. The retaining ring 72 is located below the sliding member 62.

[0053] The needle removal drive assembly 9 includes a connecting plate 91, a slot is provided on the punch fixing plate 11, the connecting plate 91 is slidably disposed inside the slot, a plurality of stop pins 4 are distributed on the connecting plate 91, and the top of the stop pins 4 penetrates the punch fixing plate 11 and is located inside the sprue 12. A second spring 92 is provided at the bottom of the connecting plate 91, and the connecting plate 91 is elastically connected to the inside of the slot through the second spring 92. An elastic sleeve rod 93 is provided inside the tube wall of the sprue sleeve 5, the top of the elastic sleeve rod 93 is fixedly connected to the connecting member, and the bottom end of the elastic sleeve faces the connecting plate 91.

[0054] Specifically, in order to solve the technical problem of record marks caused by low injection speed during the injection molding of ABS material for car pedals, the solutions to the problem of fast melt solidification include increasing the back pressure and barrel temperature when the injection molding machine injects raw material, increasing the injection speed of raw material, increasing the mold temperature and holding pressure, and increasing the raw material injection flow rate by changing the mold structure.

[0055] This design allows for the use of the above methods individually or in combination. First, the upper mold base 2 and lower mold base 1 need to be closed to allow the punch fixing plate 11 and the concave mold plate 21 to close. Then, the ABS molten material is injected into the runner 12 through the sprue sleeve 5 using an injection molding machine. Finally, the ABS molten material flows into the molding cavity along the runner 12. Before the ABS molten material fills the cavity, the screw rod 71 of the pressure control element 7 needs to be loosened to ensure that the moving ring 61 of the actuator 6 can react promptly. During the process of the raw material entering the sprue sleeve 5 and passing through the inner chamber 52, the pressure of the raw material will simultaneously act on the end face of the moving ring 61. After being subjected to the pressure of the raw material, the movable ring 61 overcomes the preload of the first spring 63 and makes a displacement response. The degree of displacement response is determined by the pressure of the raw material. The movable ring 61 will generate different working modes at different displacement levels. The working modes are divided into three states: the first state, the second state, and the third state. The three states are respectively used to meet different requirements during raw material filling. For ease of understanding, this is briefly explained in terms of the fluidity of the raw material. The first state corresponds to raw materials with poor fluidity, the second state corresponds to raw materials with very poor fluidity, and the third state corresponds to raw materials with extremely poor fluidity. The pressure on the movable ring 61 is related to the pressure generated by the raw material, and the raw material pressure is related to the back pressure of the injection molding machine. The control of pressure is related to the fluidity of the raw material, and the control of back pressure also determines the working mode of the movable ring 61; for ease of explanation, the ABS material melt is temporarily divided into the first working mode. When the movable ring 61 is under pressure in the first state, the movable ring 61 drives the sliding member 62 to start moving, and the sliding member 62 drives the elastic sleeve 93 to move accordingly. The end of the elastic sleeve 93 squeezes the connecting plate 91 located in the groove of the punch fixing plate 11. After the connecting plate 91 is squeezed and overcomes the preload of the second spring 92, it drives the stop pin 4 to move accordingly. The stop pin 4 moves and retracts from the sprue 12. At this time, the flow rate of the sprue 12 is increased; "due to the pressure increase There are two channels, which are divided into the first flow boosting channel and the second flow boosting channel for ease of explanation. The second state of operation includes the work done in the first state. When the pressure of the movable ring 61 is in the second state, the movable ring 61 continues to move and breaks free from the blockage of the inlet of the first flow boosting channel, and the first flow boosting channel opens. At this time, the flow cross-section of the sprue sleeve 5 is increased. The third state of operation includes the work done in the first and second states. When the pressure of the movable ring 61 is in the third state, the movable ring 61 continues to move and breaks free from the blockage of the inlet of the second flow boosting channel, and the second flow boosting channel opens. At this time, the flow cross-section of the sprue sleeve 5 is further increased.

[0056] like Figure 7 , Figure 8 and Figure 15 As shown, the following preferred technical solutions are provided:

[0057] The inside of the tube wall of the sprue sleeve 5 is provided with an extrusion channel, which is connected to the flow boosting channel 51. The inside of the extrusion channel is provided with a piston rod 53. The hydraulic control mechanism also includes a discharge drive mechanism 8. The movable ring 61 is connected to the piston rod 53 through the discharge drive mechanism 8.

[0058] The discharge drive mechanism 8 includes a movable rod 81, which is slidably disposed inside the tube wall of the sprue sleeve 5. The top end of the movable rod 81 is connected to the piston rod 53 through a top plate 82. The top plate 82 is elastically connected to the end of the sprue sleeve 5 through a tension spring 84. The top of the movable ring 61 is provided with a vertical plate 611. The outer wall of the vertical plate 611 is provided with several protruding teeth 612. The bottom end of the movable rod 81 is provided with several tooth grooves. A gear 83 is provided between the vertical plate 611 and the movable rod 81. The gear 83 is rotatably installed inside the tube wall of the sprue sleeve 5.

[0059] The inner wall of the sprue sleeve 5 is provided with a sealing cavity 54. The vertical plate 611 is sealed to the sealing cavity 54. When the movable ring 61 is in the normal position and the abnormal position, the interior of the inner chamber 52 and the interior of the sealing cavity 54 are not connected to the outside under the combined action of the movable ring 61 and the vertical plate 611.

[0060] Specifically, to address the technical issue of material residue in the two injection channels, when the mold or injection molding machine is not in operation, and there is no flowing material inside the sprue bushing 5, the first spring 63 pushes the movable ring 61 via the sliding member 62. The movable ring 61, through the protruding teeth 612 on the vertical plate 611, drives the gear 83 to rotate in the opposite direction. The gear 83, through meshing with the tooth groove of the movable rod 81, retracts into the tube wall of the sprue bushing 5. The movable rod 81, through the top plate 82, drives the two piston rods 53 to extend into the two injection channels respectively. The piston rods 53 squeeze out the residual material inside the injection channels, thereby preventing the residual material from solidifying inside the injection channels and causing the injection channels to malfunction. In the normal flow state, when the movable ring 61 is in the first state displacement just before the raw material is injected into the sprue sleeve 5, the teeth 612 on the vertical plate 611 are arranged at the top, so the teeth 612 cannot act on the gear 83. Therefore, the gear 83 cannot drive the movable rod 81 to move. Due to the action of the tension spring 84 pulling the top plate 82, the piston rod 53 is still inside the liquid infusion channel, which avoids the additional mechanical movement that would reduce the life of the mechanical structure when the liquid infusion channel is not in the flow state. When the movable ring 61 is in the second state displacement, the teeth 612 on the vertical plate 611 will mesh with the gear 83, thereby driving the movable rod 81 to move and causing the piston rod 53 to disengage from the two liquid infusion channels.

[0061] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A forming mold for preventing premature curing based on an automobile pedal production, characterized by, The utility model relates to a mould, including lower die seat (1), the top of lower die seat (1) is provided with upper die seat (2) slidingly, the top of lower die seat (1) is fixedly provided with male die fixed plate (11), the bottom of upper die seat (2) is fixedly provided with female die plate (21), and the male die fixed plate (11) and female die plate (21) form the forming cavity and the runner (12) between when closing mould, and the forming cavity and the runner (12) are communicated, and the bottom of male die fixed plate (11) is provided with the ejection assembly (3) for pushing out the workpiece, and the ejection assembly (3) is connected with upper die seat (2); Male die fixed plate (11) is equipped with the needle stopper (4) for controlling the runner (12) cross section, and the sprue bushing (5) is arranged on the upper die seat (2), the sprue bushing (5) penetrates the upper die seat (2) and female die plate (21) in turn, and the discharge port of the sprue bushing (5) is communicated with the runner (12) when the male die fixed plate (11) and female die plate (21) are closed, the inside of the sprue bushing (5) is equipped with the flow increasing channel (51), and the inside of the sprue bushing (5) is further equipped with the hydraulic control mechanism for controlling the needle stopper (4) station and the on-off of the flow increasing channel (51); The inside of the sprue bushing (5) is equipped with the inner hole chamber (52), the inner diameter of the inner hole chamber (52) is less than the inner diameter of the sprue bushing (5), the flow increasing channel (51) is at least one, and the inlet and outlet of the flow increasing channel (51) are arranged above and below the inner hole chamber (52) respectively, the hydraulic control mechanism includes an actuator (6), the actuator (6) is arranged between the inside of the sprue bushing (5) and the outside of the inner hole chamber (52), the actuator (6) controls the on-off of the needle stopper (4) station and the flow increasing channel (51) by the fluid pressure through the sprue bushing (5), and the hydraulic control mechanism further includes a pressure control element (7) for controlling the control range of the actuator (6); The actuator (6) includes a movable ring (61), the movable ring (61) is arranged between the inside of the sprue bushing (5) and the outside of the inner hole chamber (52), and the movable ring (61) is sealingly connected with the inner hole chamber (52) and the sprue bushing (5) respectively, the movable ring (61) is elastically connected with the inner hole chamber (52) through a spring, and a first spring (63) seals the inlet of the flow increasing channel (51) under normal conditions; The flow increasing channel (51) is arranged in the pipe wall of the sprue bushing (5), and the inlets of more than one flow increasing channel (51) are staggered along the axis of the sprue bushing (5); The pressure control element (7) includes a screw rod (71), the screw rod (71) is rotatably arranged in the pipe wall of the sprue bushing (5), the screw rod (71) is provided with a stop ring (72) for controlling the moving range of the movable ring (61), and the stop ring (72) is threadedly connected with the screw rod (71); The pipe wall of the sprue bushing (5) is provided with an extrusion channel, the extrusion channel is communicated with the flow increasing channel (51), the inside of the extrusion channel is provided with a piston rod (53), and the hydraulic control mechanism further includes a discharge driving mechanism (8), and the movable ring (61) is drivingly connected with the piston rod (53) through the discharge driving mechanism (8).

2. The forming mold capable of preventing premature curing based on an automobile foot pedal according to claim 1, wherein The discharge driving mechanism (8) comprises a movable rod (81) which is slidingly arranged in the pipe wall of the nozzle sleeve (5), the top end of the movable rod (81) is connected with the piston rod (53) through a top plate (82), the movable ring (61) is provided with a vertical plate (611), the vertical plate (611) is provided with a plurality of convex teeth (612), the bottom end of the movable rod (81) is provided with a plurality of tooth grooves, and the vertical plate (611) and the movable rod (81) are drivingly connected through a gear (83).

3. The forming mold capable of preventing premature curing based on an automobile foot pedal according to claim 1, wherein The hydraulic control mechanism further comprises a needle stripping driving assembly (9), one end of the needle stripping driving assembly (9) is drivingly connected with the movable ring (61), and a plurality of needle stoppers (4) are fixedly arranged on the other end of the needle stripping driving assembly (9).

4. The forming mold capable of preventing premature curing based on an automobile foot pedal according to claim 3, wherein The needle stripping driving assembly (9) comprises a connecting plate (91), a slot is formed in the convex die fixing plate (11), the connecting plate (91) is slidingly arranged in the slot, a plurality of needle stoppers (4) are arranged on the connecting plate (91), the top end of the needle stopper (4) penetrates through the convex die fixing plate (11) and is arranged in the runner (12), the connecting plate (91) is elastically connected with the slot through a second spring (92), and the connecting plate (91) is drivingly connected with the movable ring (61) through an elastic sleeve rod (93).

5. The forming mold for preventing premature curing based on an automobile foot pedal according to claim 2, wherein The inner wall of the nozzle sleeve (5) is provided with a sealing cavity (54), and the vertical plate (611) is sealingly connected with the sealing cavity (54).

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