Insert molding die with local heating of inserts and its processing method

Abstract

The present invention discloses an insert molding die with local heating of inserts, which includes a fixed mold and a movable mold capable of reciprocating opening and closing relative to the fixed mold; at least one workpiece receiving cavity for receiving a workpiece is provided between the fixed mold and / or the movable mold; an exhaust groove is provided on the fixed mold and / or the movable mold; the workpiece receiving cavity includes a positioning cavity and an injection molding cavity; a sprue bushing extending to the injection molding cavity is further provided on the fixed mold. The present invention provides an insert molding die with local heating of inserts, which can improve the problem that the plating layer of the metal terminal of the connector is prone to melting and discoloration during injection molding of the die.

Description

Technical Field

[0001] The present invention relates to the technical field of in-mold injection molding, and particularly to an insert molding die with local heating of inserts and a processing method thereof. Background Art

[0002] Among existing connectors, the general production method for terminals is insert molding technology (Insert Molding). In this method, before the insulator body is molded, the metal terminals are first placed in the preset positions designed in the mold, and then the mold is closed for injection molding. Thermoplastic or thermosetting materials are injected to make the molten material bond and solidify with the inserts, forming complete terminals. The advantages of this technology are: enhancing the connection strength between the metal terminals and the insulating body, avoiding deformation of the metal terminals, and improving quality and yield. In addition to being applied to connector products, this technology can also be applied to other products that require embedding components into the body.

[0003] The commonly used material for insulators is polyetheretherketone (PEEK), which has stable and good electrical insulation performance, excellent mechanical properties, high temperature resistance, impact resistance, hydrolysis resistance, radiation resistance, excellent chemical resistance, high wear resistance, outstanding self-lubrication, flame retardancy, and its strength and fatigue resistance are even better than some metal and alloy materials. It is the material with the most perfect combination of toughness and rigidity among all current resins. According to the characteristics of polyetheretherketone itself, when injecting and molding polyetheretherketone, the barrel temperature of the injection molding machine needs to be maintained at 400°C - 450°C, and the surface temperature of the mold needs to be maintained at 220°C - 250°C. The surface of the metal terminals of the connector needs to be plated, and the commonly used plating materials are gold, silver, nickel, and tin. The plating is particularly prone to melting and discoloration and other damages at this high temperature of the mold. Summary of the Invention

[0004] The present invention overcomes the deficiencies of the prior art and provides an insert molding die with local heating of inserts, which can improve the problem that the plating layer of the metal terminals of the connector is prone to melting and discoloration during injection molding of the mold.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an insert molding die with local heating of inserts, including a fixed mold and a movable mold that can reciprocally open and close relative to the fixed mold; at least one workpiece receiving cavity for receiving workpieces is provided between the fixed mold or / and the movable mold; its characteristics are: an exhaust groove is provided on the fixed mold or / and the movable mold; the workpiece receiving cavity includes a positioning cavity and an injection molding cavity; a sprue bushing extending to the injection molding cavity is further provided on the fixed mold.

[0006] In a preferred embodiment of the present invention, an air storage groove is provided on the fixed mold or / and the movable mold, and the air storage groove is communicated with the exhaust groove.

[0007] In a preferred embodiment of the present invention, an exhaust groove communicating the workpiece receiving cavity and the outside of the molding die is provided between the fixed mold and the movable mold; or / and, an exhaust groove communicating the workpiece receiving cavity and the outside of the molding die is provided in the movable mold.

[0008] In a preferred embodiment of the present invention, the fixed mold includes a fixed mold base plate disposed on the outside, a fixed mold template is provided on the side of the fixed mold base plate close to the movable mold, a fixed mold core is provided in the fixed mold template, a gate bushing is provided on the fixed mold base plate, and the injection port of the gate bushing extends into the fixed mold core.

[0009] In a preferred embodiment of the present invention, a plurality of guide sleeves are inserted into the fixed mold template, one end of the guide sleeve is locked between the fixed mold base plate and the fixed mold template, and the other end of the guide sleeve passes through the fixed mold template.

[0010] In a preferred embodiment of the present invention, the movable mold includes a movable mold base plate disposed on the outside, a movable mold template is provided on the movable mold base plate, a support plate is provided between the movable mold base plate and the movable mold template, a movable mold core is embedded in the movable mold template, and a demolding mechanism and a reset mechanism are provided between the movable mold base plate and the support plate.

[0011] In a preferred embodiment of the present invention, a plurality of ejector pin holes are provided on the movable mold core; the demolding mechanism includes a plurality of ejector pins for pushing the workpiece; a push plate and an ejector pin fixing plate are provided between the support plate and the movable mold base plate; the large end of the ejector pin is defined between the ejector pin fixing plate and the push plate; the pushing end of the ejector pin passes through the support plate and extends into the ejector pin hole of the movable mold core.

[0012] In a preferred embodiment of the present invention, a limit guide post is provided on the movable mold base plate, one end of the limit guide post is defined between the support plate and the movable mold base plate, and the limit guide post passes through the movable mold template and corresponds to the fixed mold.

[0013] In a preferred embodiment of the present invention, the reset mechanism further includes a reset rod provided between the movable mold base plate and the support plate; the upper end of the reset rod passes through the support plate and abuts against the movable mold template, and a reset spring is provided between the lower end of the reset rod and the support plate.

[0014] In a preferred embodiment of the present invention, a processing method for an insert molding die with local heating of the insert includes the following steps

[0015] Step 1, loading; placing the workpiece into the workpiece receiving cavity, receiving the workpiece through the movable mold core, and placing the end of the workpiece to be injection molded into the injection cavity in the workpiece receiving cavity.

[0016] Step 2: Positioning and mold closing; drive the moving mold and the fixed mold to press together, and confine the workpiece in the workpiece receiving cavity between the fixed mold and the moving mold;

[0017] Step 3: Machining and injection molding; inject the workpiece in the injection molding cavity through the sprue bushing; during injection molding, conduct air flow heat exchange through the air storage grooves and exhaust grooves in the moving mold and the fixed mold;

[0018] Step 4: Ejecting the workpiece and demolding; separate the moving mold and the fixed mold, push up the ejector rod passing through the moving mold base plate correspondingly, support the ejector plate of the ejector pin and the return rod upward, the return spring is stressed and deformed, the ejector pin passes through the moving mold core and pushes up the workpiece received in the moving mold core to realize the operation of ejecting the workpiece and demolding;

[0019] Step 5: Resetting the ejector pin; retract the ejector rod, cancel the pushing force on the ejector plate, the return spring resumes, reset the ejector pin and the return rod, and widen the distance between the ejector plate and the support plate.

[0020] According to the insert molding die with local heating of the insert and its processing method disclosed in the above embodiments, the beneficial effects achieved are:

[0021] An insert molding die with local heating of the insert and its processing method according to the present invention add air storage grooves and exhaust grooves on the basis of the traditional die, solve the technical problems of melting and discoloration of the surface coating of the metal terminal at high temperature, ensure the production yield, and can be widely promoted and applied. The air storage grooves and exhaust grooves can allow the gas and heat to be discharged smoothly; the design of the air storage grooves and exhaust grooves will not affect the injection molding quality of the terminals.

[0022] (1) Fixed mold part: exhaust grooves are designed on the fixed mold core and the fixed mold template, and the gas and heat can be discharged smoothly.

[0023] (2) Moving mold part: an air storage groove is designed on the moving mold core, and an exhaust groove is designed at the position of the ejector pin hole. The gas and heat can pass through the air storage groove and the exhaust groove smoothly and then be discharged through the gap between the ejector pin and the ejector pin hole.

[0024] (3) There is enough safety distance between the air storage groove and the insulator to ensure the injection molding quality; due to the design of the air storage groove, the heat accumulated in the safety distance part during the injection molding process can be conducted to the air storage groove part smoothly and then discharged through the fixed mold and the moving mold. Description of the drawings

[0025] The present invention will be further described below in conjunction with the drawings and embodiments;

[0026] Figure 1 It is a front view structural schematic diagram of the embodiment disclosed according to the present invention;

[0027] Figure 2 It is an exploded structural schematic diagram in the front view of the embodiment disclosed according to the present invention;

[0028] Figure 3 Exploded structural schematic diagram in axonometric view according to the embodiments disclosed in the present invention;

[0029] Figure 4 Cross-sectional structural schematic diagram in front view according to the embodiments disclosed in the present invention Figure 1 ;

[0030] Figure 5 According to the present invention disclosed Figure 4 Enlarged structural schematic diagram of part A in

[0031] Figure 6 According to the present invention disclosed Figure 4 Enlarged structural schematic diagram of part B in

[0032] Figure 7 Cross-sectional structural schematic diagram in front view according to the embodiments disclosed in the present invention Figure 2 ;

[0033] Figure 8 Top view structural schematic diagram of the moving mold according to the embodiments disclosed in the present invention;

[0034] Figure 9 For Figure 8 Cross-sectional structural schematic diagram at C-C in

[0035] Figure 10 Top view structural schematic diagram of the fixed mold according to the embodiments disclosed in the present invention;

[0036] Figure 11 For Figure 10 Cross-sectional structural schematic diagram at D-D in

[0037] Figure 12 For Figure 3 Enlarged structural schematic diagram of the moving mold core in

[0038] Figure 13 Structural schematic diagram of the metal terminal 1 and the insulator of workpiece 1 according to the embodiments disclosed in the present invention;

[0039] Figure 14 Structural schematic diagram of workpiece 1 according to the embodiments disclosed in the present invention;

[0040] Figure 15 Structural schematic diagram of workpiece 2 according to the embodiments disclosed in the present invention;

[0041] Figure 16 Structural schematic diagram of the metal terminal 1 and the insulator of workpiece 2 according to the embodiments disclosed in the present invention;

[0042] Among them, 1 - sprue bushing, 2 - fixed mold base plate, 3 - fixed mold template, 4 - guide bushing, 5 - fixed mold core backing plate, 6 - fixed mold core, 9 - moving mold core, 10 - moving mold core backing plate, 11 - guide pillar, 12 - moving mold template, 13 - support plate, 14 - ejector pin, 15 - return rod, 16 - support pillar, 17 - spacer block, 19 - ejector pin fixing plate, 20 - ejector plate, 21 - moving mold base plate, 231 - longitudinal exhaust path, 232 - transverse exhaust path, 271 - metal terminal one, 281 - metal terminal two, 26 - insulator, 27 - workpiece one, 28 - workpiece two, 29 - exhaust groove, 291 - longitudinal exhaust groove, 292 - transverse exhaust groove, 30 - air storage tank, 31 - trash pin, 32 - return spring, 33 - ejector pin hole, 34 - air guiding groove, 35 - positioning cavity, 36 - injection molding cavity, 37 - injection port, 38 - runner. Detailed implementation mode

[0043] Now, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0044] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then such directional indications will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Unless otherwise clearly defined and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] Embodiment 1

[0046] As Figures 13 to 16As shown in the figure, the two groups of workpieces processed by the present invention include a group of workpiece one 27 and a group of workpiece two 28. Workpiece one 27 includes metal terminal one 271. One end of metal terminal one 271 is injection-molded and wrapped with insulator 26 by the molding die of the present application. Workpiece two 28 includes metal terminal two 281. One end of metal terminal two 281 is injection-molded and wrapped with insulator 26 by the molding die of the present application. Both metal terminal one 271 and metal terminal two 281 are sheet-like structures. The difference between workpiece two 28 and workpiece one 27 is that a bending portion is provided on metal terminal one 271, and metal terminal two 281 is a planar structure.

[0047] As Figures 1 to 12 shown, an insert molding die with local heating of inserts includes a fixed die and a movable die that can move up and down relative to the fixed die. The movable die is located below the fixed die; between the fixed die and the movable die, two sets of workpiece receiving cavities are arranged oppositely, and the two sets of workpiece receiving cavities arranged oppositely are respectively used to receive workpiece one 27 and workpiece two 28; each workpiece receiving cavity includes a positioning cavity 35 and an injection molding cavity 36; the injection molding cavity 36 of a set of workpiece receiving cavities for receiving workpiece one 27 is adjacent to the injection molding cavity 36 of the other set of workpiece receiving cavities for receiving workpiece two 28. The shape of the workpiece receiving cavity matches the shape of workpiece one 27 or workpiece two 28 it receives.

[0048] The fixed die and the movable die are respectively installed in the injection molding machine. The fixed die is arranged at the upper part of the injection molding machine, and the movable die is arranged at the lower part of the injection molding machine. The movable die is driven to open and close up and down relative to the fixed die by a pushing mechanism arranged at the lower part of the injection molding machine. Exhaust grooves 29 are arranged on the fixed die and the movable die; a sprue bushing 1 extending to the injection molding cavity 36 is arranged on the fixed die. The sprue bushing 1 is connected to the injection molding mechanism of the injection molding machine, and workpiece one 27 and workpiece two 28 in the workpiece receiving cavities arranged oppositely are injection-molded through the sprue bushing 1 connected to the injection molding mechanism.

[0049] Specifically, the exhaust groove 29 includes a horizontal exhaust groove 292 and a vertical exhaust groove 291. A horizontal exhaust groove 292 communicating the workpiece receiving cavity and the outside of the molding die is arranged between the fixed die and the movable die. A longitudinal air storage groove 30 is arranged in the receiving cavities of the fixed die and the movable die. The vertical exhaust groove 291 in the movable die communicates with the receiving cavity. A thimble hole 33 corresponding to and communicating with the workpiece receiving groove is arranged on the movable die; the vertical exhaust groove 291 is arranged in the thimble hole 33. A horizontal exhaust groove 292 is also arranged between the fixed die and the movable die, and the horizontal exhaust groove 292 connects the workpiece receiving cavity and the outside of the molding die. Further, as Figures 8 to 12 shown, concave air storage grooves 30 are arranged on both the movable die and the fixed die. The air storage groove 30 on the movable die is communicated with the thimble hole 33 through an air guiding groove 3434 to form a vertical exhaust groove 291. The air storage groove 30 on the fixed die forms a horizontal exhaust groove 292 communicating with the outside of the molding die through several groups of stagger-connected grooves arranged on the fixed die.

[0050] More specifically, the fixed mold includes a fixed mold base plate 2 provided on the outside. On the side of the fixed mold base plate 2 close to the movable mold, there is a fixed mold template 3. Inside the fixed mold template 3, there are embedded a fixed mold core 6 backing plate 5 and a fixed mold core 6. A sprue bushing 1 is provided on the fixed mold base plate 2. The injection port 37 of the sprue bushing 1 passes through the fixed mold base plate 2, the fixed mold core 6 backing plate 5, and the fixed mold template 3 and then extends into the fixed mold core 6. Guide bushings 4 are respectively inserted through the four corners of the fixed mold template 3. One end of the guide bushing 4 is provided with a boss, and the boss is locked between the fixed mold base plate 2 and the fixed mold template 3. The other end of the guide bushing 4 passes through the fixed mold template 3.

[0051] More specifically, the movable mold includes a movable mold base plate 21 provided on the outside. A movable mold template 12 is provided on the movable mold base plate 21. A support plate 13 is provided between the movable mold base plate 21 and the movable mold template 12. Inside the movable mold template 12, there are embedded a movable mold core 9 backing plate and a movable mold core 9. A push plate 20 and an ejector pin fixing plate 19 are provided between the movable mold base plate 21 and the support plate 13. A demolding mechanism and a reset mechanism are provided on the push plate 20 and the ejector pin fixing plate 19. More specifically, the reset mechanism further includes a reset rod 15 provided between the movable mold base plate 21 and the support plate 13; the upper end of the reset rod 15 passes through the support plate 13 and abuts against the movable mold template 12, and a reset spring 32 is provided between the lower end of the reset rod 15 and the support plate 13.

[0052] Specifically, a number of ejector pin holes 33 are provided on the support plate 13, the movable mold core 9 backing plate, and the movable mold core 9; the demolding mechanism includes a number of ejector pins 14 for pushing the workpiece; the upper end of the ejector pin 14 passes through the support plate 13 and extends into the ejector pin holes 33 of the movable mold core 9, and the lower end of the ejector pin 14 is limited between the support plate 13 and the movable mold base plate 21. A limit guide post 11 is provided on the movable mold base plate 21. One end of the limit guide post 11 is limited between the support plate 13 and the movable mold base plate 21, and after passing through, the limit guide post 11 is docked with the guide bushing 4 of the fixed mold.

[0053] Embodiment 2

[0054] The processing method of the insert molding die with local heating of the insert in Embodiment 1 includes the following steps.

[0055] Step 1, feeding; the workpiece is placed into the cavities for receiving workpiece 1 27 and workpiece 2 28. The movable mold core 9 receives workpiece 1 27 and workpiece 2 28, and the injection ends of workpiece 1 27 and workpiece 2 28 are correspondingly placed into the injection cavities 36 in the cavities for receiving workpiece 1 27 and workpiece 2 28.

[0056] Step 2, limiting and clamping the mold; the mold is pressed down so that the fixed mold and the movable mold are pressed together up and down, and workpiece 1 27 and workpiece 2 28 are limited in the workpiece receiving cavity between the fixed mold and the movable mold.

[0057] Step 3, injection molding; the workpiece 1 (27) and the workpiece 2 (28) in the injection mold cavity 36 are injection molded through the sprue bushing 1; during injection molding, air flow heat exchange is carried out through the transverse exhaust groove 292 and the longitudinal exhaust groove 291 in the moving mold and the fixed mold;

[0058] Step 4, material ejection and demolding; separate the moving mold and the fixed mold. After the moving mold moves downward, the ejector rod passing through the moving mold base plate 21 upward pushes the ejector plate 20 supporting the ejector pin 14 and the return rod 15. The return spring 32 is stressed and deformed. The ejector pin 14 passes through and pushes the workpiece 1 (27) and the workpiece 2 (28) received on the moving mold core 9 to realize the material ejection and demolding operation;

[0059] Step 5, the ejector pin 14 returns to its original position; the ejector rod retracts, the pushing force on the ejector plate 20 is withdrawn, the return spring 32 resumes, the ejector pin 14 and the return rod 15 are reset, and the distance between the ejector plate 20 and the support plate 13 is increased.

[0060] Working principle:

[0061] The workpiece 1 (27) and the workpiece 2 (28) are respectively placed into the workpiece receiving cavities. The moving mold core 9 receives the workpieces, and the end of the workpiece to be injection molded is correspondingly placed into the injection mold cavity 36 in the workpiece receiving cavity; press down the mold so that the fixed mold and the moving mold are pressed together up and down, and the workpieces are limited in the workpiece receiving cavity between the fixed mold and the moving mold; the workpiece 1 (27) and the workpiece 2 (28) in the injection mold cavity 36 located in the injection mold cavity 36 are injection molded through the sprue bushing 1; after injection molding, air flow heat exchange is carried out through the transverse exhaust groove 292 and the longitudinal exhaust groove 291 in the moving mold and the fixed mold; separate the moving mold and the fixed mold. After the moving mold moves downward, the ejector rod passing through the moving mold base plate 21 upward pushes the ejector plate 20 supporting the ejector pin 14 and the return rod 15. The return spring 32 is stressed and deformed. The ejector pin 14 passes through and pushes the workpieces received on the moving mold core 9 to realize the material ejection and demolding operation; the ejector rod retracts, the pushing force on the ejector plate 20 is withdrawn, the return spring 32 resumes, the ejector pin 14 and the return rod 15 are reset, and the distance between the ejector plate 20 and the support plate 13 is increased.

[0062] Based on the ideal embodiments of the present invention as the inspiration, through the above description, relevant personnel can completely make various changes and modifications within the scope not deviating from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. An insert molding die with local heating of inserts, comprising a fixed mold and a movable mold capable of reciprocating opening and closing relative to the fixed mold; at least one workpiece receiving cavity for receiving a workpiece is arranged between the fixed mold or / and the movable mold; Characterized in that: An exhaust groove is arranged on the fixed mold or / and the movable mold; the workpiece receiving cavity comprises a positioning cavity and an injection molding cavity; a sprue bushing extending to the injection molding cavity is further arranged on the fixed mold; An air storage groove is arranged on the fixed mold or / and the movable mold, and the air storage groove is communicated with the exhaust groove; An exhaust groove communicating the workpiece receiving cavity with the outside of the molding die is arranged between the fixed mold and the movable mold; or / and, an exhaust groove communicating the workpiece receiving cavity with the outside of the molding die is arranged in the movable mold; The fixed mold comprises a fixed mold base plate arranged on the outside, a fixed mold template is arranged on one side of the fixed mold base plate close to the movable mold, a fixed mold core is arranged in the fixed mold template, a sprue bushing is arranged on the fixed mold base plate, and the glue injection port of the sprue bushing extends into the fixed mold core; A plurality of guide sleeves are arranged in the fixed mold template, one end of the guide sleeve is locked between the fixed mold base plate and the fixed mold template, and the other end of the guide sleeve penetrates through the fixed mold template; The movable mold comprises a movable mold base plate arranged on the outside, a movable mold template is arranged on the movable mold base plate, a support plate is arranged between the movable mold base plate and the movable mold template, a movable mold core is embedded in the movable mold template, and a demolding mechanism and a reset mechanism are arranged between the movable mold base plate and the support plate; A plurality of ejector pin holes are arranged on the movable mold core; the demolding mechanism comprises a plurality of ejector pins for pushing the workpiece; a push plate and an ejector pin fixing plate are arranged between the support plate and the movable mold base plate; the large end of the ejector pin is defined between the ejector pin fixing plate and the push plate; the pushing end of the ejector pin penetrates through the support plate and then extends into the ejector pin hole of the movable mold core.

2. The insert molding die with local heating of inserts according to claim 1, Characterized in that: A limit guide post is arranged on the movable mold base plate, one end of the limit guide post is defined between the support plate and the movable mold base plate, and the limit guide post penetrates through the movable mold template and corresponds to the fixed mold.

3. The insert molding die with local heating of inserts according to claim 2, Characterized in that: The reset mechanism further comprises a reset rod arranged between the movable mold base plate and the support plate; the upper end of the reset rod penetrates through the support plate and abuts against the movable mold template, and a reset spring is arranged between the lower end of the reset rod and the support plate.

4. The processing method of the insert molding die with local heating of inserts according to any one of claims 1 to 3, Characterized in that: Comprises the following steps, Step 1, feeding; placing the workpiece into the workpiece receiving cavity, receiving the workpiece through the movable mold core, and placing the end of the workpiece to be injection molded into the injection molding cavity in the workpiece receiving cavity correspondingly; Step 2, limiting and clamping the mold; driving the movable mold and the fixed mold to be pressed together to limit the workpiece in the workpiece receiving cavity between the fixed mold and the movable mold; Step 3, processing by injection molding; injecting the workpiece in the injection mold cavity through the sprue bushing; while injecting, performing gas flow heat exchange through the gas storage grooves and exhaust grooves in the moving mold and the fixed mold; Step 4, ejecting the material and demolding; separating the moving mold and the fixed mold, pushing up the ejector rod correspondingly passing through the moving mold base plate, pushing up the ejector plate supporting the ejector pin and the return rod, the return spring is stressed and deformed, the ejector pin passes through the moving mold core and pushes the workpiece received in the moving mold core to realize the ejecting and demolding operation; Step 5, resetting the ejector pin; retracting the ejector rod, canceling the pushing force on the ejector plate, the return spring resumes, resetting the ejector pin and the return rod, and pulling apart the distance between the ejector plate and the support plate.

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