An injection molding mold for producing plastic parts with internal threads
By designing a detachable threaded core and push mechanism in the injection molding mold, the deformation and wear problems when the threaded core is separated from the plastic parts are solved, and higher maintenance efficiency and lower production costs are achieved.
Patent Information
- Application Number
- CN202421265739.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-04
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-06-04
AI Technical Summary
In injection molding molds, when producing plastic parts with internal threads, the separation between the threaded core and the plastic parts depends on a complex mold release mechanism, which easily leads to deformation of the plastic parts and damage to the internal threads, and the wear of the threaded core is difficult to repair or replace.
An injection molding mold including an upper formwork and a lower formwork is designed. The lower formwork is equipped with a removable threaded core and a push mechanism to push the threaded core together with the plastic parts, reducing the risk of damage to the plastic parts, and allowing the threaded core to be replaced directly when worn.
Through the removable threaded core and push mechanism, the risk of damage to the plastic parts during the mold release process is reduced, and the maintenance efficiency and service life of the mold are improved, thereby reducing production costs.
Smart Images
Figure CN222697789U_ABST
Abstract
Description
[Technical field]
[0001] The utility model relates to the technical field of injection molding molds, in particular to an injection molding mold for producing plastic parts with internal threads. [Background technology]
[0002] With the wide application of plastic products in various fields, plastic parts with internal threads, such as pipe joints, bottle caps, and electrical housings, have become common items in daily life and production. Among them, injection molding molds, as key equipment for plastic processing, inject molten plastic into the cavity, and the molten plastic cools and solidifies to form a plastic part shape consistent with the cavity, thereby completing the molding of the plastic part.
[0003] However, when producing plastic parts with internal threads through injection molding, the internal threads of the plastic parts are usually formed by a threaded core fixed inside the mold. When separating the threaded core from the plastic part, it often relies on complex demoulding mechanisms such as rotary ejection mechanisms, which can easily cause deformation of the plastic part and damage to the internal threads. At the same time, after long-term use, the thread structure of the threaded core is prone to severe wear and tear, which is difficult to repair or replace. [Utility Model Content]
[0004] The utility model aims to provide an injection molding die for producing plastic parts with internal threads, thereby solving the above problems.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an injection molding mold for producing plastic parts with internal threads, comprising an upper mold plate and a lower mold plate, the upper mold plate is provided with a cavity insert, the lower mold plate is provided with a core assembly, the cavity insert and the core assembly together surround and form a cavity for molding plastic parts, the core assembly comprises a main core and a threaded core, the main core is provided with a mounting hole that passes through the main core, the threaded core is detachably connected in the mounting hole, and the mold is also provided with an ejection mechanism that can eject the threaded core from the main core.
[0006] As a further optimization scheme of the utility model, a top bead is provided on the side wall of the mounting hole, and the top bead is connected to a guide groove for allowing the top bead to move backward. A pressing elastic member is provided in the guide groove for pressing the top bead forward, and a limiting groove that can cooperate with the top bead is provided on the side wall of the threaded core.
[0007] As a further optimization scheme of the utility model, the ejection mechanism includes a movable push plate arranged below the lower template, and a moving gap is left between the lower template and the movable push plate for the movable push plate to move upward. The movable push plate is provided with a core push rod located below the mounting hole and capable of pressing the threaded core upward when the movable push plate moves upward.
[0008] As a further optimization scheme of the utility model, a plastic push plate is provided between the upper template and the lower template, a connecting rod is provided between the plastic push plate and the movable push plate, and a reset elastic member capable of pressing the movable push plate to move downward is provided between the lower template and the movable push plate.
[0009] As a further optimization scheme of the utility model, a pressure plate is provided on the upper part of the cavity insert, and a pouring channel connected to the cavity is provided on the pressure plate; a cover plate is provided above the upper template, and a gate sleeve is provided on the cover plate, and a main channel connected to the pouring channel is provided on the gate sleeve; the cover plate is also provided with pulling pins that can be embedded in the solidified material in the pouring channel and can pull the solidified material out of the pouring channel when the cover plate moves upward.
[0010] As a further optimization scheme of the utility model, the cover plate is connected to a first limiting column, a first limiting portion is provided at one end of the first limiting column, the upper template is provided with a first limiting boss that can abut against the first limiting portion to limit the upward movement of the first limiting column, and a parting elastic member that can press the cover plate upward is provided between the cover plate and the first limiting boss.
[0011] As a further optimization scheme of the utility model, the cover plate includes a top plate, and a sprue push plate arranged below the top plate, the sprue sleeve is arranged on the top plate, a second limiting column is connected to the sprue push plate, a second limiting boss is arranged on the top plate, and one end of the second limiting column is provided with a second limiting portion which can abut against the second limiting boss to limit the upward movement of the top plate.
[0012] As a further optimization scheme of the utility model, the top plate is connected with a pull rod, and the other end of the pull rod passes through the top plate, the sprue push plate, the upper template, the plastic part push plate, and the lower template in sequence, the lower template is provided with a guide column, the sprue push plate is provided with a first guide sleeve that cooperates with the pull rod, the upper template is provided with a second guide sleeve that cooperates with the pull rod, and a third guide sleeve that cooperates with the guide column, and the plastic part push plate is provided with a fourth guide sleeve that cooperates with the guide column.
[0013] As a further optimization solution of the utility model, a cushion column is provided on the lower template, an insertion hole for inserting the upper end of the cushion column is provided on the upper template, and a nylon plug is provided between the insertion hole and the cushion column.
[0014] As a further optimization solution of the utility model, the lower part of the threaded core is a regular polygon.
[0015] Compared with the prior art, the utility model has the following advantages: by providing a threaded core detachably connected to the mounting hole and an ejection mechanism capable of ejecting the threaded core from the main core, the threaded core can be ejected together with the plastic part when the plastic part is demolded, thereby reducing the risk of damage to the plastic part; at the same time, when the threaded core is worn to a certain extent, it can be directly taken out of the mounting hole for repair or replaced with a new threaded core, thereby improving the maintenance efficiency of the mold, extending the service life of the mold, and reducing production costs.
Brief Description of the Drawings
[0016] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 for Figure 1 The schematic cross-sectional view is made along the cross-sectional line AA;
[0019] Figure 3 for Figure 2 A partial enlarged schematic diagram of the H in the middle;
[0020] Figure 4 for Figure 1 Schematic diagram of the section made along the section line BB. [Specific implementation method]
[0021] The implementation modes of the present utility model are described in detail below in conjunction with the accompanying drawings.
[0022] like Figures 1 to 4 As shown, the utility model discloses an injection molding mold for producing a plastic part with an internal thread, comprising an upper mold plate 1 and a lower mold plate 2, wherein the upper mold plate 1 is provided with a cavity insert 11, and the lower mold plate 2 is provided with a core assembly 3, the cavity insert 11 and the core assembly 3 together surround and form a cavity 4 for molding the plastic part, the core assembly 3 comprises a main core 31 and a threaded core 32, the main core 31 is provided with a mounting hole 311 penetrating the main core 31, the threaded core 32 is detachably connected in the mounting hole 311, and the mold is also provided with an ejection mechanism 5 capable of ejecting the threaded core 32 from the main core 31.
[0023] The upper template 1 and the lower template 2 together constitute the main frame of the mold. By setting the cavity insert 11 in the upper template 1 and the core assembly 3 on the lower template 2, the upper template 1 and the lower template 2 are tightly fitted when the mold is closed. The cavity insert 11 and the core assembly 3 together surround and form a cavity 4 for molding plastic parts, thereby determining the size, shape and surface texture of the plastic parts. The cavity insert 11 is provided with a point gate for molten plastic to fill the cavity. By replacing the cavity insert 11 of different shapes, the mold can quickly apply the design changes of different plastic parts, reduce the mold update cost, and improve production flexibility. The threaded core 32 is used to form the thread structure inside the plastic part. The threaded core 32 is detachably connected to the main core 31, which is convenient for the separate replacement or maintenance of the threaded core 32. At the same time, when producing plastic products with different thread specifications, only the threaded core 32 needs to be replaced, which saves the mold modification cost and improves the versatility of the mold. When the plastic part is cooled and hardened and is ready to be released from the mold cavity, the ejection mechanism 5 can eject the threaded core 32 from the main core 31 , so that the threaded core 32 and the plastic part are released from the mold cavity together.
[0024] By providing a threaded core 32 detachably connected to the mounting hole 311 and an ejection mechanism 5 capable of ejecting the threaded core 32 from the main core 31, the threaded core 32 can be ejected together with the plastic part when the plastic part is demolded, thereby reducing the risk of damage to the plastic part; at the same time, when the threaded core 32 is worn to a certain extent, it can be directly taken out of the mounting hole 311 for repair or replaced with a new threaded core 32, thereby improving the maintenance efficiency of the mold, extending the service life of the mold, and reducing the production cost.
[0025] A top bead 312 is provided on the side wall of the mounting hole 311, and the top bead 312 is connected to a guide groove 313 for allowing the top bead 312 to move backward. A pressing elastic member 314 is provided in the guide groove 313 for pressing the top bead 312 forward. A limiting groove 321 capable of cooperating with the top bead 312 is provided on the side wall of the threaded core 32.
[0026] The top ball 312 can be embedded in the limiting groove 321 when the mold is in the closed state, preventing the thread core 32 from moving under the injection pressure, thereby ensuring the molding accuracy of the internal thread plastic part. The top-pressing elastic member 314 can be a spring, elastic rubber or other components, and the top ball 312 can be pressed forward by the top-pressing elastic member 314, so that when the top ball 312 and the guide groove 313 are aligned, the top ball 312 is pressed into the guide groove 313, thereby locking the two. When the ejection mechanism 5 pushes the thread core 32, the setting of the guide groove 313 enables the top ball 312 to move backward, thereby releasing the lock on the thread core 32.
[0027] In the embodiment, the stop groove 321 on the outer cylindrical surface of the threaded core 32 is pressed by the top ball 312 to fix it in the main core 31 to form the core assembly 3. The top ball 312 and the stop groove 321 cooperate with each other, so that the connection between the threaded core 32 and the main core 31 does not require an additional fixing device, which facilitates the disassembly, assembly and replacement of the threaded core 32.
[0028] The ejection mechanism 5 includes a movable push plate 51 arranged below the lower mold plate 2, and a moving gap 52 is reserved between the lower mold plate 2 and the movable push plate 51 for the movable push plate 51 to move upward. The movable push plate 51 is provided with a core push rod 53 which is located below the mounting hole 311 and can press the threaded core 32 upward when the movable push plate 51 moves upward.
[0029] The movable push plate 51 forms a relatively movable relationship with the lower mold plate 2 through the movable gap 52. The core push rod 53 is fixed on the movable push plate 51, and its top end contacts the bottom end of the threaded core 32. When the movable push plate 51 moves upward, the core push rod 53 rises accordingly, exerting an upward thrust on the threaded core 32, so that it is disengaged from the installation hole 311 of the main core 31. The core push rod 53 is directly driven by the upward movement of the movable push plate 51, which simplifies the mold structure and reduces the difficulty of operation and maintenance cost.
[0030] In the embodiment, the movable push plate 51 includes an upper plate 512 and a lower plate 513, the upper plate 512 and the lower plate 513 are connected by bolts 514, a mounting hole is provided at the lower portion of the upper plate 512, the lower portion of the core push rod 53 is provided in the mounting hole, and an escape hole is also provided on the upper plate 512, which is connected to the mounting hole and allows the core push rod 53 to extend out of the upper plate 512. By providing the upper plate 512 and the lower plate 513, the core push rod 53 is fixedly connected to the movable push plate 51, thereby improving the stability of the core push rod 53 during operation.
[0031] In the embodiment, the movable push plate 51 is further provided with a limit block 511. By setting the limit block 511, when the movable push plate 51 moves upward, the travel of the movable push plate 51 is limited to prevent excessive movement thereof from interfering with or damaging other parts of the mold.
[0032] The threaded core 32 is locked by the top ball 312 and pushed out by the core push rod 53, so that the threaded core 32 is not easy to move during injection molding, and it is also easier for the core push rod 53 to disassemble the threaded core 32 after injection molding. The structure is simple and practical.
[0033] A plastic part push plate 54 is provided between the upper template 1 and the lower template 2, a connecting rod 55 is provided between the plastic part push plate 54 and the movable push plate 51, and a reset elastic member 56 capable of pressing the movable push plate 51 to move downward is provided between the lower template 2 and the movable push plate 51.
[0034] The plastic push plate 54 is arranged between the upper mold plate 1 and the lower mold plate 2. When the mold is opened, the plastic push plate 54 can push the plastic part away from the core assembly 3, thereby realizing demolding of the plastic part. The connecting rod 55 connects the plastic push plate 54 and the movable push plate 51, so that the plastic push plate 54 moves upward synchronously with the movable push plate 51, so that the process of pushing out the plastic part is synchronized with the process of pushing out the core push rod 53, thereby avoiding the inconsistency between the process of separating the plastic part from the main core 31 and the process of separating the threaded core 32 from the main core 31, which may cause problems such as deformation of the plastic part and damage to the internal thread.
[0035] A pressure plate 12 is provided on the upper part of the cavity insert 11, and a pouring channel 121 connected to the cavity 4 is provided on the pressure plate 12; a cover plate 6 is provided above the upper mold plate 1, and a gate sleeve 61 is provided on the cover plate 6, and a main channel 611 connected to the pouring channel 121 is provided on the gate sleeve 61; the cover plate 6 is also provided with a pulling pin 62 that can be embedded in the solidified material in the pouring channel 121 and can pull the solidified material out of the pouring channel 121 when the cover plate 6 moves upward.
[0036] The pressing plate 12 is connected to the pouring channel 121, providing a channel for the molten plastic to enter the mold cavity. The cover plate 6 is arranged above the upper mold plate 1, and a gate sleeve 61 and a main channel 611 are provided on the cover plate 6, providing an entrance for the molten plastic to enter the pouring channel 121. The pulling pin 62 is arranged on the cover plate 6, embedded in the coagulum, and can pull the coagulum out of the pouring channel 121 when the cover plate 6 moves upward, so as to realize automatic demolding of the coagulum. By setting the pulling pin 62, the coagulum can be automatically pulled out of the pouring channel 121 when the cover plate 6 moves upward, thereby improving production efficiency and work safety.
[0037] The cover plate 6 is connected to a first limiting column 63, one end of which is provided with a first limiting portion 631, the upper template 1 is provided with a first limiting boss 13 which can abut against the first limiting portion 631 to limit the upward movement of the first limiting column 63, and a parting elastic member 14 which can press the cover plate 6 upward is provided between the cover plate 6 and the first limiting boss 13.
[0038] The first limiting portion 631 is arranged at one end of the first limiting column 63, and cooperates with the first limiting boss 13 on the upper template 1 to limit the upward movement range of the first limiting column 13; the parting elastic member 14 is arranged between the cover plate 6 and the first limiting boss 13 to provide an upward pre-pressure for the cover plate 6, thereby ensuring that the cover plate 6 can be opened from the parting surface first under the action of the parting elastic member 14 when opening the mold, thereby realizing the mold opening function of the mold.
[0039] The cover plate 6 includes a top plate 64 and a sprue push plate 65 arranged below the top plate 64, the sprue sleeve 61 is arranged on the top plate 64, the sprue push plate 65 is connected to a second limiting column 651, a second limiting boss 641 is provided on the top plate 64, and one end of the second limiting column 651 is provided with a second limiting portion 6511 that can abut against the second limiting boss 641 to limit the upward movement of the top plate 64.
[0040] The top plate 64 and the nozzle push plate 65 disposed below the top plate 64 enable the two to be separated by mold opening. The sprue sleeve 61 is disposed on the top plate 64. When the top plate 64 is separated from the nozzle push plate 65, the condensate in the main channel 611 and the pouring flow channel 121 will be pulled out of the main channel 611 as the top plate 64 moves upward and the nozzle push plate 65 pushes down, thereby completing the cleaning of the condensate in the main channel 611. The second limiting boss 641 and the second limiting portion 6511 that can abut against the second limiting boss 641 to limit the upward movement of the top plate 64 can limit the upward movement range of the top plate 64, thereby limiting the top plate 64.
[0041] The top plate 64 is connected to a pull rod 8, and the other end of the pull rod 8 passes through the top plate 64, the sprue push plate 65, the upper template 1, the plastic part push plate 54, and the lower template 2 in sequence. The lower template 2 is provided with a guide column 95, the sprue push plate 65 is provided with a first guide sleeve 91 that cooperates with the pull rod 8, the upper template 1 is provided with a second guide sleeve 92 that cooperates with the pull rod 8, and a third guide sleeve 93 that cooperates with the guide column 95, and the plastic part push plate 54 is provided with a fourth guide sleeve 94 that cooperates with the guide column 95.
[0042] Through the arrangement of the pull rod 8, the guide column 95, and the first guide sleeve 91, the second guide sleeve 92, the third guide sleeve 93, and the fourth guide sleeve 94, the user can open the mold more conveniently while the top plate 64, the sprue push plate 65, the upper mold plate 1, and the plastic part push plate 54 move smoothly and accurately in the vertical direction during the opening and closing process to prevent offset or misalignment and maintain the accuracy of the mold closing.
[0043] The lower mold plate 2 is provided with a cushion column 21 , and the upper mold plate 1 is provided with an insertion hole 15 for inserting the upper end of the cushion column 21 . A nylon plug 7 is provided between the insertion hole 15 and the cushion column 21 .
[0044] In the embodiment, the pad column 21 is fixed to the nylon plug 7 by a tapered bolt. When the tapered bolt is tightened, its head gradually squeezes the nylon plug 7. The nylon plug 7 will be elastically deformed after being subjected to pressure, so that an elastic connection is formed between the lower mold plate 2, the plastic part push plate 54, and the upper mold plate 1.
[0045] The lower portion of the thread core 32 is a regular polygon.
[0046] In the embodiment, the lower portion of the thread core 32 is square. The lower portion of the thread core 32 is a regular polygon, which is convenient for the user to manually remove the thread core 32 from the plastic part outside the mold by using tools such as wrenches and sleeves that match the shape, and the operation is convenient.
[0047] The specific usage of the utility model is as follows:
[0048] (1) Injection filling
[0049] The molten plastic flows through the main flow channel 611 of the sprue bushing 61 , the pouring flow channel 121 of the pressing plate 12 and the point gate of the cavity insert 11 to fill the cavity.
[0050] (2) Mold opening and parting
[0051] Driven by the injection molding machine and fixed mold plate, the mold is parted in sequence:
[0052] First parting: Using the nylon plug 7, the tapered bolt and the pad column 21, with the help of the tension of the nylon plug 7, an elastic connection is formed between the lower mold plate 2, the plastic push plate 54, and the upper mold plate 11; under the elastic force of the parting elastic member 14, the mold is first opened at the parting surface II, and the first limit column 63 is used to pull the gate push plate 65 and the upper mold plate 1. During this period, the pulling pin 62 is used to separate the solidified material from the cavity insert 11 and the pressure plate 12.
[0053] Second parting: the mold is opened at the parting surface I, and the condensate is scraped out from the main flow channel 611 of the gate sleeve 61 by the sprue push plate 65, and is separated from the pulling pin 62 until the second limiting column 651 pulls the top plate 64.
[0054] The third parting: the mold opens at the parting surface III, the nylon plug 7 is separated from the insertion hole 15 of the upper mold plate 1, and the plastic part is separated from the cavity insert 11 until the mold is opened enough.
[0055] (3) Push out plastic parts and threaded cores
[0056] The movable push plate 51 pushes the connecting rod 55 and the core push rod 53, so that the mold is opened at IV; the connecting rod 55 drives the plastic part push plate 54 to push out the plastic part, and the core push rod 53 pushes out the threaded core 32, so that the plastic part and the threaded core 32 are separated from the main core 31 together.
[0057] (4) Thread demoulding
[0058] The user uses a manual tool to remove the thread core 32 from the plastic part, thereby completing the manual separation of the plastic part and the thread core 32 outside the mold.
[0059] (5) Reset of ejection mechanism
[0060] Under the elastic force of the resetting elastic member 56 , the movable push plate 51 is reset with the connecting rod 55 , the core push rod 53 and the plastic part push plate 54 .
[0061] (6) Place the threaded movable core
[0062] The threaded core 32 is placed into the main core 31 and fixed in place by using the top ball 312 as a positioning component.
[0063] (7) Mold closing
[0064] Driven by the injection molding machine and fixed platen, each platen on the mold closes separately to complete an injection molding cycle.
Claims
1. An injection molding mold for producing a plastic part with an internal thread, characterized in that: The mold comprises an upper mold plate (1) and a lower mold plate (2); the upper mold plate (1) is provided with a cavity insert (11); the lower mold plate (2) is provided with a core assembly (3); the cavity insert (11) and the core assembly (3) together surround a cavity (4) for molding a plastic part; the core assembly (3) comprises a main core (31) and a threaded core (32); the main core (31) is provided with a mounting hole (311) penetrating the main core (31); the threaded core (32) is detachably connected to the mounting hole (311); and the mold is also provided with an ejection mechanism (5) capable of ejecting the threaded core (32) from the main core (31).
2. An injection molding die for producing a plastic part with an internal thread according to claim 1, characterized in that: A top bead (312) is provided on the side wall of the mounting hole (311), and the top bead (312) is connected to a guide groove (313) capable of allowing the top bead (312) to move backwards. A pressing elastic member (314) capable of pressing the top bead (312) forwards is provided in the guide groove (313), and a limiting groove (321) capable of cooperating with the top bead (312) is provided on the side wall of the threaded core (32).
3. An injection molding die for producing a plastic part with an internal thread according to claim 2, characterized in that: The ejection mechanism (5) comprises a movable push plate (51) disposed below the lower mold plate (2); a moving gap (52) is reserved between the lower mold plate (2) and the movable push plate (51) for the movable push plate (51) to move upward; and a core push rod (53) is provided on the movable push plate (51) which is located below the mounting hole (311) and can press the threaded core (32) upward when the movable push plate (51) moves upward.
4. The injection molding die for producing a plastic part with an internal thread according to claim 3, characterized in that: A plastic part push plate (54) is provided between the upper template (1) and the lower template (2), a connecting rod (55) is provided between the plastic part push plate (54) and the movable push plate (51), and a reset elastic member (56) capable of pressing the movable push plate (51) to move downward is provided between the lower template (2) and the movable push plate (51).
5. The injection molding die for producing a plastic part with an internal thread according to claim 4, characterized in that: A pressure plate (12) is provided on the upper part of the cavity insert (11), and a pouring channel (121) connected to the cavity (4) is provided on the pressure plate (12); a cover plate (6) is provided above the upper mold plate (1), and a gate sleeve (61) is provided on the cover plate (6), and a main channel (611) connected to the pouring channel (121) is provided on the gate sleeve (61); and a pulling pin (62) is also provided on the cover plate (6) which can be embedded in the solidified material in the pouring channel (121) and can pull the solidified material out of the pouring channel (121) when the cover plate (6) moves upward.
6. The injection molding die for producing a plastic part with internal threads according to claim 5, characterized in that: The cover plate (6) is connected to a first limiting column (63), one end of which is provided with a first limiting portion (631), the upper template (1) is provided with a first limiting boss (13) capable of abutting against the first limiting portion (631) to limit the upward movement of the first limiting column (63), and a parting elastic member (14) capable of pressing the cover plate (6) upward is provided between the cover plate (6) and the first limiting boss (13).
7. The injection molding die for producing a plastic part with internal threads according to claim 5, characterized in that: The cover plate (6) includes a top plate (64) and a sprue push plate (65) arranged below the top plate (64); the sprue sleeve (61) is arranged on the top plate (64); a second limiting column (651) is connected to the sprue push plate (65); a second limiting boss (641) is arranged on the top plate (64); one end of the second limiting column (651) is provided with a second limiting portion (6511) that can abut against the second limiting boss (641) to limit the upward movement of the top plate (64).
8. The injection molding die for producing a plastic part with internal threads according to claim 7, characterized in that: The top plate (64) is connected to a pull rod (8), and the other end of the pull rod (8) passes through the top plate (64), the sprue push plate (65), the upper template (1), the plastic part push plate (54), and the lower template (2) in sequence. The lower template (2) is provided with a guide column (95), the sprue push plate (65) is provided with a first guide sleeve (91) that matches the pull rod (8), the upper template (1) is provided with a second guide sleeve (92) that matches the pull rod (8), and a third guide sleeve (93) that matches the guide column (95), and the plastic part push plate (54) is provided with a fourth guide sleeve (94) that matches the guide column (95).
9. An injection molding die for producing a plastic part with an internal thread according to claim 8, characterized in that: The lower template (2) is provided with a cushion column (21), the upper template (1) is provided with an insertion hole (15) for inserting the upper end of the cushion column (21), and a nylon plug (7) is provided between the insertion hole (15) and the cushion column (21).
10. The injection molding die for producing a plastic part with internal threads according to claim 1, characterized in that: The lower part of the thread core (32) is a regular polygon.
Citation Information
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