L-shaped pin framework forming device and forming method thereof
By combining the mold split design with the thermoelectric cooling element, and integrating the copper wire pre-embedding and injection molding processes, the problem of copper wire loosening and detachment was solved, and the L-shaped pin skeleton with high bonding strength and high integration was formed.
Patent Information
- Application Number
- CN202511355572.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2025-12-12
AI Technical Summary
In the existing L-shaped pin skeleton forming process, the copper wire pre-embedding process and the injection molding process are carried out separately, which leads to problems such as loose copper wire, insufficient pull-out force, and loosening due to thermal expansion and contraction, and the process integration is not high.
Design an L-shaped pin skeleton forming device. After the injection molded part is formed, the mold split part 1 and mold split part 2 are removed. The copper wire is cut by the cutting component. Combined with the thermoelectric cooling plate, the copper wire and plastic are cooled as a whole by the thermal expansion and contraction effect. The device integrates the pre-embedded copper wire and the injection molding process, so that the insertion, positioning, bending and cutting of the copper wire can be completed in the same mold.
It improves the bonding strength between copper wire and plastic, avoids the loosening problem caused by mechanical embedding, has a high degree of process integration, shortens the production cycle, and avoids problems such as misalignment and assembly misalignment.
Smart Images
Figure CN121105299A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of injection molding part processing, in particular to an L-shaped pin foot skeleton forming device and a forming method thereof. BACKGROUND
[0002] The L-shaped pin foot skeleton is an injection molding part, and its main feature is that a copper wire is pre-embedded in the injection molding part. The copper wire passes through the injection molding part and is partially covered, forming an L-shaped pin structure, which not only maintains good electrical performance, but also takes into account a certain structural strength.
[0003] The existing pre-embedded copper wire process and injection molding process of the injection molding part are separate. Since the injection molding part is completely shaped when the copper wire is inserted, the copper wire is only fixed by mechanical embedding cooperation, which is prone to problems such as looseness, insufficient pull-out force, and loosening due to thermal expansion and contraction. In addition, the process integration is not high, and the production process is lengthy. Therefore, it is necessary to design an L-shaped pin foot skeleton forming device with high integration and a forming method thereof. SUMMARY
[0004] The purpose of the present application is to provide an L-shaped pin foot skeleton forming device and a forming method thereof to solve the problems raised in the background art.
[0005] In order to solve the above technical problems, the present application provides the following technical scheme: an L-shaped pin foot skeleton forming device, comprising a base, a mold fixing seat is fixedly installed on the top of the base, an electric push rod is installed on one side of the mold fixing seat, a hot melt plastic shell is connected to one end of the electric push rod, the hot melt plastic shell is in sliding contact with the top of the base, a mold split part one is installed on the top of the mold fixing seat, a mold split part two is installed on one side of the hot melt plastic shell, a left cavity is formed in the inside of the mold split part one, a right cavity is formed in the inside of the mold split part two, the right cavity and the left cavity are cooperating structures, and a cutting assembly is arranged on the top of the base.
[0006] According to the above technical scheme, the cutting assembly comprises a downward pressing cylinder fixedly connected with the base, a fixed shell is connected to the output end of the downward pressing cylinder, a pressing block is arranged on one side of the bottom of the fixed shell, a bending block is arranged on the other side of the bottom of the fixed shell, and a cutting knife is arranged on the bottom of the fixed shell.
[0007] According to the above technical scheme, an upward pressing cylinder is arranged in the inside of the base, an upward pressing plate is connected to the output end of the upward pressing cylinder, a connecting block is installed on the top of the upward pressing plate, a receiving seat is connected to the top of the connecting block, a square groove is formed in the top of the receiving seat, the cutting knife and the side wall of the square groove are aligned with each other, the bending block and the side wall of the receiving seat are aligned with each other, and a conveying roller is rotatably installed on the inner wall of the square groove.
[0008] According to the technical scheme, one side of the receiving seat is provided with a thermoelectric refrigeration piece, one end of the thermoelectric refrigeration piece is electrically connected with a direct current power supply, the other end of the thermoelectric refrigeration piece is upwardly arranged, one end of the direct current power supply is electrically connected with a conductive elastic body, and the top of the conductive elastic body is provided with an electrode piece.
[0009] According to the technical scheme, the inner wall of the right cavity is provided with an injection port, one end of the injection port extends to the inside of the hot melt plastic shell, the inner wall of the right cavity is provided with a groove, the inner wall of the groove is provided with an arc-shaped groove, the arc-shaped groove is slidably arranged with an arc-shaped block, and one end of the arc-shaped groove is connected with a liquid pump.
[0010] According to the technical scheme, the inside of the base is provided with a discharging cylinder, the output end of the discharging cylinder is connected with a discharging rod, and the top of the discharging rod extends to between the first mold split part and the second mold split part.
[0011] A forming method of an L-shaped pin skeleton forming device, comprising the following steps: S1, the copper wire is sent to the lower side of the hot melt plastic shell by the wire feeder, the first mold split part and the second mold split part are combined, the injection port is turned on, and the high-temperature molten plastic is poured from the hot melt plastic shell to between the left cavity and the right cavity; S2, the liquid pump is started to inject liquid into the arc-shaped groove, the arc-shaped block is pushed outward, the arc-shaped block pushes away the material of the hot melt plastic, a threading hole for the copper wire to pass through is formed in the injection part, the liquid is extracted from the arc-shaped groove as the hot melt plastic cools and sets, and the arc-shaped block enters the arc-shaped groove; S3, the second mold split part is moved away by starting the electric push rod, the copper wire is not hindered by the stamping, the receiving seat is moved upward by starting the upper top cylinder, and the fixed shell is moved downward by starting the lower pressing cylinder to stamp and cut the copper wire; S4, the fixed shell is moved upward by starting the lower pressing cylinder, the copper wire is fed transversely by starting the conveying roller, one end of the copper wire enters the threading hole of the injection part, and the injection part is unloaded by starting the discharging cylinder.
[0012] According to the technical scheme, in S3, when the copper wire is stamped and cut, the end of the copper wire is bent by the bending block, the end of the copper wire will touch one electrode of the thermoelectric refrigeration piece during bending, the power supply circuit from the direct current power supply to the electrode piece is connected due to the conductivity of the copper wire, the thermoelectric refrigeration piece starts to refrigerate, the copper wire contacts the cold end surface and cools down due to the upward arrangement of the cold end surface, and the copper wire cools and shrinks through the thermal expansion and cold contraction effect.
[0013] Compared with the prior art, the present application has the beneficial effects that: the present application is characterized in that the mold split part one and the mold split part two are used to move the mold on one side away after the injection molding part is formed, and the copper wire is cut off by the cutting assembly, so that the process of embedding the copper wire and the process of injection molding are integrated together, since the injection molding part is not completely cooled when embedding the copper wire, the inner wall shape can better fit the copper wire, forming high bonding strength, avoiding the loosening problem caused by mechanical embedding, the copper wire is inserted, positioned, bent, cut off and molded in one mold process, without the need to separately set the wire insertion process, and the process integration degree is high. BRIEF DESCRIPTION OF DRAWINGS
[0014] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, and do not constitute a limitation of the present application. In the drawings: Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the installation of the mold fixing seat of the present application; Figure 3 is a schematic diagram of the installation of the connecting plate and the receiving seat of the present application; Figure 4 is a schematic diagram of the structure of the injection molding part of the present application; Figure 5 is a schematic diagram of the cross-sectional structure of the receiving seat of the present application; Figure 6 is a schematic diagram of the working process of the present application; Figure 7 is a schematic diagram of the installation of the mold split part one and the mold split part two of the present application; 1, base; 2, mold fixing seat; 21, hot melt plastic shell; 211, electric push rod; 22, mold split part one; 221, left cavity; 23, mold split part two; 231, right cavity; 232, groove; 233, arc-shaped groove; 234, liquid pump; 235, arc-shaped block; 236, injection port; 3, cutting assembly; 31, lower pressing cylinder; 32, fixed shell; 33, cutting knife; 34, pressing block; 35, bending block; 4, ejection cylinder; 41, ejection rod; 5, upper top cylinder; 51, upper top plate; 52, connecting block; 6, injection molding part; 7, receiving seat; 8, copper wire; 71, square groove; 72, thermoelectric refrigeration sheet; 73, direct current power supply; 74, conveying roller; 75, conductive elastomer; 76, electrode sheet. DETAILED DESCRIPTION
[0015] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.
[0016] Please refer to Figures 1-7 The present application provides a technical scheme: an L-shaped pin skeleton forming device, comprising a base 1, a mold fixing seat 2 is fixedly installed on the top of the base 1, an electric push rod 211 is installed on one side of the mold fixing seat 2, a hot melt plastic shell 21 is connected to one end of the electric push rod 211, the hot melt plastic shell 21 is in sliding contact with the top of the base 1, a mold split part one 22 is installed on the top of the mold fixing seat 2, a mold split part two 23 is installed on one side of the hot melt plastic shell 21, a left cavity 221 is formed in the inside of the mold split part one 22, a right cavity 231 is formed in the inside of the mold split part two 23, the right cavity 231 and the left cavity 221 are cooperating structures, a cutting assembly 3 is arranged on the top of the base 1, the positions of the mold fixing seat 2 and the mold split part one 22 are fixed, and the positions of the hot melt plastic shell 21 and the mold split part two 23 are controlled to move horizontally by the extension and retraction of the electric push rod 211, the left cavity 221 and the right cavity 231 are combined to form an injection mold for forming an injection part 6, the inside of the hot melt plastic shell 21 has a heating device, so that the inside plastic is melted and enters between the right cavity 231 and the left cavity 221 to form the injection part, after the injection part is formed, the two are separated without affecting the bending and cutting processes of the copper wire, and the two processes are integrated together. The cutting assembly 3 comprises a lower pressing cylinder 31 fixedly connected with the base 1, a fixed shell 32 connected to the output end of the lower pressing cylinder 31, a pressing block 34 arranged on one side of the bottom of the fixed shell 32, a bending block 35 arranged on the other side of the bottom of the fixed shell 32, and a cutting knife 33 arranged on the bottom of the fixed shell 32, after the lower pressing cylinder 31 is started, the fixed shell 32 moves downward to press the copper wire, the copper wire is cut by the cutting knife 33, and one end of the copper wire is bent by the bending block 35, which prevents the sharp end of the copper wire from directly contacting the inner wall of the threading hole to cause a scratch, and guides the movement path of the copper wire inside the threading hole to enable it to move downward to form an L-shaped copper wire threading effect, the pressing block 34 is used to press the body of the copper wire to facilitate stress concentration during cutting, and the length of the bent section of the copper wire 8 should be controlled to be able to smoothly enter the inside of the threading hole; The inside of the base 1 is provided with an upper top cylinder 5, the output end of the upper top cylinder 5 is connected with an upper top plate 51, the top of the upper top plate 51 is installed with a connecting block 52, the top of the connecting block 52 is connected with a receiving seat 7, the top of the receiving seat 7 is provided with a square groove 71, the cutting knife 33 is aligned with the side wall of the square groove 71, the bending block 35 is aligned with the side wall of the receiving seat 7, the inner wall of the square groove 71 is correspondingly provided with a conveying roller 74, one end of the conveying roller 74 is connected with an external torque, the upper top cylinder 5 is started to drive the upper top plate 51 to move upwards, and the connecting block 52 is driven to move upwards, so that the receiving seat 7 can be in contact with the copper wire 8, which is convenient for subsequent cutting and bending, after cutting and bending, the external torque is started to drive the two conveying rollers 74 to clamp the copper wire 8 to rotate towards each other, drive the copper wire 8 to feed laterally, so that it can enter the threading hole of the injection molding part 6, and complete the threading step; One side of the receiving seat 7 is installed with a thermoelectric refrigeration piece 72, one end of the thermoelectric refrigeration piece 72 is electrically connected with a direct current power supply 73, the other end of the thermoelectric refrigeration piece 72 is provided upward, one end of the direct current power supply 73 is electrically connected with a conductive elastic body 75, the top of the conductive elastic body 75 is installed with an electrode piece 76, the thermoelectric refrigeration piece 72 is a semiconductor refrigeration piece, the upper end surface thereof is a refrigeration end, the middle part is a PN junction, and the lower end is a heating end, one end of the thermoelectric refrigeration piece 72 is communicated with the direct current power supply 73, and the other end thereof faces upward, under normal circumstances, since the copper wire 8 is not bent, the end thereof will not be in contact with the electrode of the thermoelectric refrigeration piece 72, and will not be refrigerated, after bending, the end thereof is in contact with the electrode, since the copper wire 8 has conductivity to form a closed loop, the semiconductor refrigeration piece starts to refrigerate, the refrigeration end is in contact with the end of the copper wire 8 and transmits low temperature to the copper wire 8, due to the thermal expansion and cold contraction effect, the copper wire 8 slightly shrinks, which is convenient for entering the threading hole more smoothly during subsequent lateral feeding, and expands after cooling to room temperature, and is better matched with the inner wall of the threading hole; The inner wall of the right cavity 231 is provided with an injection port 236, one end of the injection port 236 extends to the inside of the hot melt plastic shell 21, the inner wall of the right cavity 231 is provided with a groove 232, the inner wall of the groove 232 is provided with an arc-shaped groove 233, the arc-shaped groove 233 is slidably installed with an arc-shaped block 235, one end of the arc-shaped groove 233 is connected with a liquid pump 234, one end of the liquid pump 234 is connected with an external liquid source, after injection is completed, the liquid pump 234 is started to inject liquid into the arc-shaped groove 233, the pressure in the arc-shaped groove 233 is increased, so that the arc-shaped block 235 is pushed out, the arc-shaped block 235 makes the injection molding part 6 perforated, since it is arc-shaped, the movement track also forms an arc-shaped channel in the injection molding part 6, enters from the right side and exits from the lower side, with the cooling and forming of the injection molding part 6, the liquid pump 234 is reversely started to discharge the liquid, and the arc-shaped block 235 is re-stored in the arc-shaped groove 233, which is convenient for setting the threading hole during injection; The inside of the base 1 is internally mounted with an unloading cylinder 4, the output end of the unloading cylinder 4 is connected with an unloading rod 41, the top of the unloading rod 41 extends to between the mold split part one 22 and the mold split part two 23, when the threading is completed, the unloading cylinder 4 is started, the output end drives the unloading rod 41 to upwardly jolt, so that the injection molded part 6 and the mold split part one 22 are mutually separated to complete the unloading; A forming method of an L-shaped pin skeleton forming device, comprising the following steps: S1, use the wire feeder to send the copper wire 8 to below the hot melt plastic shell 21, make the mold split part one 22 and the mold split part two 23 close, turn on the injection port 236 and pour the high-temperature molten plastic from the hot melt plastic shell 21 to between the left cavity 221 and the right cavity 231; S2, start the liquid pump 234 to inject liquid into the arc-shaped groove 233, push the arc-shaped block 235 outward, the arc-shaped block 235 pushes away the material of the hot melt plastic, so that the threading hole for the copper wire 8 to pass through is formed in the injection molded part 6, with the hot melt plastic cooling and setting, the liquid is extracted from the arc-shaped groove 233, and the arc-shaped block 235 enters the arc-shaped groove 233; S3, start the electric push rod 211 to move the mold split part two 23 away, so as not to hinder the stamping of the copper wire, start the upward jacking cylinder 5 to move the receiving seat 7 upward, and start the downward pressing cylinder 31 to move the fixed shell 32 downward to stamp and cut the copper wire; S4, start the downward pressing cylinder 31 to move the fixed shell 32 upward, start the conveying roller 74 to feed the copper wire 8 transversely, so that one end of the copper wire 8 enters the threading hole of the injection molded part 6, and start the unloading cylinder 4 to unload the injection molded part 6 by the unloading rod 41; In S3, when the copper wire is stamped and cut, the end of the copper wire is bent by the bending block 35, and when the copper wire end is bent, the copper wire end will touch an electrode of the thermoelectric refrigeration piece 72, because of the conductivity of the copper wire, the power supply circuit from the direct current power supply 73 to the electrode piece 76 is connected, the thermoelectric refrigeration piece 72 starts to refrigerate, because the cold end is upwardly arranged, the copper wire contacts the cold end and cools down, and the copper wire cools and shrinks through the thermal expansion and cold contraction effect.
[0017] The application completes copper wire penetration and bending when the injection molding part has not been completely cooled, and the plastic material is still in a softened state, which can cover the copper wire and naturally shrink and tighten during the cooling process; compared with the traditional needle insertion method after cooling, which only relies on mechanical pressure fit, the application realizes the integration of copper wire + plastic shell material heat shrinkage, improves the pull-out force and durability. The copper wire is fed by a wire feeding mechanism, and the stamping + cutting + bending is completed by a cutting assembly to form an L-shaped pin; the whole process of copper wire pre-embedding is completed in the mold, without the need for external mechanical hand assistance for wire insertion, avoiding problems such as misalignment, broken, misalignment during assembly and the like; the mold design introduces an arc block hydraulic perforation structure to ensure reliable formation of the wire hole and does not affect the injection molding accuracy. When the copper wire is bent, the end head contacts the electrode of the thermoelectric refrigeration piece to trigger refrigeration, and the copper wire slightly shrinks due to thermal expansion and contraction. The copper wire is prevented from being blocked due to thermal expansion, and the ability of the copper wire to smoothly penetrate the hole of the not completely cooled plastic part is improved; after cooling is completed, the copper wire slightly expands again to realize close fitting with the hole wall. All operations are completed in the same mold cavity and mold action system, significantly compressing the molding cycle.
[0018] The application is characterized in that the mold part one and the mold part two are used to move the mold on one side away after the injection molding part is formed, and the cutting assembly is used to cut the copper wire, so that the process of pre-embedding the copper wire and the process of injection molding are integrated together. Since the injection molding part is not completely cooled when the copper wire is pre-embedded, the inner wall shape can better fit the copper wire to form high bonding strength and avoid the loosening problem caused by mechanical embedding. The copper wire penetration, positioning, bending, cutting and molding are integrated and completed in one mold process, without the need for a separate wire insertion process, and the process integration degree is high.
[0019] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0020] Finally, it should be noted that: the above only describes the preferred embodiments of the application and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement and the like made within the spirit and principles of the application shall be included in the protection scope of the application.
Claims
1. An L-shaped pin skeleton forming device, characterized in that: The system includes a base (1), a mold fixing seat (2) is fixedly installed on the top of the base (1), an electric push rod (211) is installed on one side of the mold fixing seat (2), one end of the electric push rod (211) is connected to a hot melt plastic shell (21), the hot melt plastic shell (21) slides in contact with the top of the base (1), a mold split part one (22) is installed on the top of the mold fixing seat (2), a mold split part two (23) is installed on one side of the hot melt plastic shell (21), a left cavity (221) is opened inside the mold split part one (22), a right cavity (231) is opened inside the mold split part two (23), the right cavity (231) and the left cavity (221) are a mating structure, and a cutting component (3) is provided on the top of the base (1).
2. The L-shaped pin skeleton forming device according to claim 1, characterized in that: The cutting assembly (3) includes a pressing cylinder (31) fixedly connected to the base (1). The output end of the pressing cylinder (31) is connected to a fixed housing (32). A pressing block (34) is provided on one side of the bottom of the fixed housing (32), a bending block (35) is provided on the other side of the bottom of the fixed housing (32), and a cutting blade (33) is provided at the bottom of the fixed housing (32).
3. The L-shaped pin skeleton forming device according to claim 2, characterized in that: The base (1) is equipped with an upper cylinder (5), the output end of which is connected to an upper plate (51). A connecting block (52) is installed on the top of the upper plate (51), and a receiving seat (7) is connected to the top of the connecting block (52). A square groove (71) is opened on the top of the receiving seat (7). The cutting blade (33) is aligned with the side wall of the square groove (71), and the bending block (35) is aligned with the side wall of the receiving seat (7). A conveying roller (74) is rotatably installed on the inner wall of the square groove (71), and one end of the conveying roller (74) is connected to an external torque.
4. The L-shaped pin skeleton forming device according to claim 3, characterized in that: A thermoelectric cooling chip (72) is installed on one side of the receiving base (7). One end electrode of the thermoelectric cooling chip (72) is electrically connected to a DC power supply (73). The other end electrode of the thermoelectric cooling chip (72) is set with its surface facing upward. One end of the DC power supply (73) is electrically connected to a conductive elastomer (75). An electrode sheet (76) is installed on the top of the conductive elastomer (75).
5. The L-shaped pin skeleton forming device according to claim 4, characterized in that: The inner wall of the right cavity (231) is provided with an injection port (236), one end of which extends into the interior of the hot melt plastic shell (21). The inner wall of the right cavity (231) is provided with a groove (232), and the inner wall of the groove (232) is provided with an arc-shaped groove (233). An arc-shaped block (235) is slidably installed inside the arc-shaped groove (233), and a liquid pump (234) is connected through one end of the arc-shaped groove (233).
6. The L-shaped pin skeleton forming device according to claim 5, characterized in that: The base (1) is equipped with a discharge cylinder (4), and the output end of the discharge cylinder (4) is connected to a discharge rod (41). The top of the discharge rod (41) extends between the mold split part one (22) and the mold split part two (23).
7. A method for forming an L-shaped pin skeleton forming device, characterized in that: Includes the following steps: S1. Use a wire feeder to transport copper wire (8) to the bottom of the hot melt plastic shell (21), so that mold split part one (22) and mold split part two (23) are closed, the injection port (236) is opened, and the plastic in the hot melt plastic shell (21) is poured from the hot melt plastic shell (21) into the space between the left cavity (221) and the right cavity (231); S2. Start the liquid pump (234) to inject liquid into the arc-shaped groove (233), push the arc-shaped block (235) outward, and the arc-shaped block (235) squeezes the material of the hot melt plastic, so that a wire hole for the copper wire (8) to pass through is formed in the injection molded part (6). As the hot melt plastic cools and solidifies, the liquid is extracted from the arc-shaped groove (233), and the arc-shaped block (235) enters the arc-shaped groove (233). S3. Start the electric push rod (211) to move the mold split part two (23) away, so as not to obstruct the stamping of copper wire. Start the upper cylinder (5) to move the receiving seat (7) upward. Start the lower cylinder (31) to move the fixed housing (32) downward to stamp and cut the copper wire. S4. Start the pressing cylinder (31) to move the fixed housing (32) upward, start the conveying roller (74) to feed the copper wire (8) laterally, so that one end of it enters the wire hole of the injection molded part (6), and start the unloading cylinder (4) to unload the injection molded part (6) by the unloading rod (41).
8. The forming method of the L-shaped pin skeleton forming device according to claim 7, characterized in that: In S3, when the copper wire is punched and cut, the end of the copper wire is bent by the bending block (35). When bending, the end of the copper wire will touch one of the electrodes of the thermoelectric cooling chip (72). Due to the conductivity of the copper wire, the power supply circuit from the DC power supply (73) to the electrode plate (76) is connected, and the thermoelectric cooling chip (72) starts to cool. Since its cold end face is set upward, the copper wire contacts the cold end face and cools down. The copper wire cools and contracts through the thermal expansion and contraction effect.