Plastic gear injection molding mold

Abstract

The utility model discloses a plastic gear injection molding mold which comprises a lower mold block, a mold groove is formed in the surface of the lower mold block, and fixing columns are arranged at the four corners of the upper portion of the lower mold block. The mold core is installed in the mold groove in a matched mode, a cooling mechanism is arranged on the mold core, and the cooling mechanism is used for accelerating cooling of the mold core; the upper die block is inserted on the fixing column in a penetrating mode, the rectangular part can provide stable supporting, the semicircular part can achieve smooth transition, the die core is easy and convenient to disassemble, the die core is separated from the lower die block so that other types of die cores can be replaced, production of different gears can be achieved, the whole lower die block and the whole upper die block do not need to be replaced, and production efficiency is improved. Therefore, when different gears are produced, frequent installation of the lower die block and the upper die block is omitted, and meanwhile the production cost of the die is reduced. The die cavity and the die core are smoothly inserted and assembled from the side edge, so that the trouble of alignment can be saved, and a plurality of limiting holes are not required to be formed for inserting and positioning according to a plurality of connecting rods.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear injection molding, and in particular relates to a plastic gear injection molding mold. Background Art

[0002] Plastic gears are mainly used for transmission. The gear material is plastic, and its use in mechanical transmission is becoming more and more widespread. Plastic gears generally use injection molding molds. Injection molding is also called injection molding. It is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, automated operation, and a wide variety of colors and patterns.

[0003] After searching, the patent with announcement number CN212097376U discloses a nylon gear injection molding mold, and its content records "including a lower template, the top of the lower template is provided with at least one partial model hole, the top of the lower template is provided with an intermediate template, the top of the intermediate template is provided with an upper template, the top of the upper template is provided with a liquid inlet hole, the bottom of the upper template is provided with a partial model hole, the liquid inlet hole is connected with the partial model hole, the intermediate template is provided with a partial model hole at the partial model hole at the bottom of the upper template, the partial model hole on the template, the lower template...", and the above-mentioned, it can be seen that the injection molding mold of this patent can only produce one type of gear, and other types of gears need to replace the mold as a whole, which greatly increases the production cost. At the same time, there is a lack of rapid cooling of the mold, which leads to increased cooling and demolding time of the product. Utility Model Content

[0004] The utility model aims to provide a plastic gear injection molding die to solve the problems of production cost and cooling in the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A plastic gear injection molding mold comprises: a lower module, a mold groove is provided on the surface of the lower module, and fixing columns are provided at the four corners above the lower module; a mold core, a mold core is fitted in the mold groove, and a cooling mechanism is provided on the mold core, wherein the cooling mechanism is used to accelerate the cooling of the mold core; and an upper module, wherein the upper module is inserted on the fixing columns.

[0007] Furthermore, a gear forming groove is provided on the surface of the mold core, and the mold groove and the mold core are rectangular at the bottom and semicircular at the top, and the mold groove and the mold core cooperate with each other. The mold groove and the mold core are smoothly inserted and assembled from the side, which can save the trouble of alignment and does not need to open multiple limiting holes to insert and position according to multiple connecting rods.

[0008] Furthermore, an extension rod is provided at the semicircular end of the mold core, threaded holes are symmetrically provided at the bottom of the rectangular end of the mold core, a limiting hole is opened on the side wall of the mold groove, and the limiting hole is arranged at the semicircular end of the mold groove, and countersunk holes are symmetrically opened on the surface of the mold groove, and the countersunk holes are arranged at the rectangular end of the mold groove.

[0009] Furthermore, when the mold core is fully assembled with the lower mold section, the extension rod is embedded in the limiting hole, and the countersunk hole and the threaded hole remain concentric.

[0010] Furthermore, the cooling mechanism includes a cooling chamber, a filling hole is provided on one side of the cooling chamber, and a water injection port is provided on the side wall of the mold groove, and the water injection port is located on the side wall of the rectangular end of the mold groove. Water is injected into the cooling chamber, and the water is evenly distributed in the cooling chamber to accelerate the cooling speed of the mold core, thereby shortening the cooling and demoulding time of the product. Cooling can also effectively reduce the residual thermal stress inside the product and improve the mechanical properties and service life of the product.

[0011] Furthermore, a round hole is formed at one end of the extension rod, and a rope is passed through the round hole to assist the crane arm in carrying the mold core under load.

[0012] Furthermore, a hollow groove is provided on the surface of the mold groove, and the hollow groove is concentric with the semicircular end of the mold groove, and an ejection component is provided inside the hollow groove.

[0013] The technical solution of the utility model has the following beneficial effects:

[0014] 1. The rectangular part can provide stable support, while the semicircular part can achieve a smooth transition. The core can be easily disassembled, and the core can be separated from the lower module to replace other types of cores to achieve the production of different gears. There is no need to replace the entire lower module and upper module, which saves the frequent installation of the lower module and upper module when producing different gears, and reduces the production cost of the mold. The mold groove and the core are smoothly inserted and assembled from the side, which can save the trouble of alignment and does not need to open multiple limit holes for insertion and positioning according to multiple connecting rods.

[0015] 2. Inject water into the cooling chamber. The water is evenly distributed in the cooling chamber to accelerate the cooling speed of the mold core, thereby shortening the cooling and demoulding time of the product. Cooling can also effectively reduce the residual thermal stress inside the product and improve the mechanical properties and service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2It is a schematic diagram of the bottom structure of the utility model.

[0019] Figure 3 It is a schematic diagram of the lower module assembly structure of the utility model.

[0020] Figure 4 This is a schematic diagram of the mold core structure of the utility model.

[0021] Figure 5 For the utility model Figure 3 Schematic diagram of the cross-sectional structure.

[0022] Figure 6 It is a schematic diagram of the partial cross-sectional structure of the utility model.

[0023] Figure 7 It is a schematic diagram of the cross-sectional structure of the mold core of the utility model.

[0024] Figure numerals: 10, lower module; 11, fixing column; 12, upper module; 13, mold groove; 14, hollow groove; 15, limiting hole; 16, countersunk hole; 17, water injection port; 18, mold core; 19, extension rod; 20, round hole; 21, ejection assembly; 22, injection hole; 23, threaded hole; 24, bolt; 25, cooling chamber; 26, filling hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] Embodiment 1:

[0027] refer to Figure 1 A plastic gear injection molding mold includes a lower module 10, an upper module 12 and a mold core 18. A mold groove 13 is provided on the surface of the lower module 10, and a mold core 18 is installed in the mold groove 13. A gear molding groove is opened on the surface of the mold core 18. During injection molding, the raw material enters the gear molding groove to form a product.

[0028] Furthermore, fixing columns 11 are provided at the four corners above the lower module 10, and the upper module 12 is inserted on the fixing columns 11; the upper module 12 is stabilized by the fixing columns 11, and an injection hole 22 is opened on the surface of the upper module 12; when the lower module 10 and the upper module 12 are molded together, the heated and molten plastic is injected into the injection hole 22 through the injection machine and enters the mold to fill the inside of the gear molding groove.

[0029] Furthermore, the mold groove 13 and the mold core 18 are rectangular at the bottom and semicircular at the top, and the mold groove 13 and the mold core 18 cooperate with each other. This cooperation mode can ensure that when the mold groove 13 and the mold core 18 are assembled, they can be accurately aligned and smoothly inserted and assembled from one side, thereby ensuring the matching accuracy between the mold groove 13 and the mold core 18; the design of the mold groove 13 and the mold core 18 being rectangular at the bottom and semicircular at the top can ensure that the injection molded part has high stability in key dimensions. The rectangular part can provide stable support, while the semicircular part can achieve a smooth transition, and the mold core 18 is easy to disassemble, and the mold core 18 is separated from the lower module 10 to replace other types of mold cores 18 to achieve the production of different gears, so there is no need to replace the entire lower module 10 and the upper module 12, so that when producing different gears, the frequent installation of the lower module 10 and the upper module 12 is omitted, and the production cost of the mold is reduced. The mold groove 13 and the mold core 18 are smoothly inserted and assembled from the side, which can save the trouble of alignment, and there is no need to open multiple limit holes to insert and position according to multiple connecting rods.

[0030] Further references Figure 3-Figure 7 An extension rod 19 is provided at the semicircular end of the mold core 18, and a threaded hole 23 is symmetrically provided at the bottom of the rectangular end of the mold core 18. A limiting hole 15 is provided on the side wall of the mold groove 13, and the limiting hole 15 is provided at the semicircular end of the mold groove 13. Countersunk holes 16 are symmetrically provided on the surface of the mold groove 13, and the countersunk holes 16 are provided at the rectangular end of the mold groove 13.

[0031] In the above solution, when the mold core 18 is fully assembled with the lower mold block 10, the extension rod 19 is embedded in the limiting hole 15, and the outer surface of the extension rod 19 is provided with a threaded structure, and the nut is rotated on the extension rod 19 to stabilize the assembly of the mold core 18. When the mold core 18 is fully assembled with the lower mold block 10, the countersunk hole 16 and the threaded hole 23 remain concentric, and the bolt 24 is passed through the countersunk hole 16 and is rotated and fixed inside the threaded hole 23, thereby further stabilizing the assembly of the mold core 18.

[0032] Embodiment 2:

[0033] refer to Figure 5-Figure 7 A cooling mechanism is provided on the mold core 18, and the cooling mechanism is used to accelerate the cooling of the mold core 18. The cooling mechanism includes a cooling chamber 25, and a filling hole 26 is opened on one side of the cooling chamber 25. A water injection port 17 is opened on the side wall of the mold groove 13, and the water injection port 17 is on the side wall of the rectangular end of the mold groove 13.

[0034] In the above scheme, when the mold core 18 and the lower module 10 are fully assembled, the water injection port 17 is kept concentric with the filling hole 26, and the molten plastic after heating is injected into the injection hole 22 through the injection machine into the mold. When filling the inside of the gear molding groove, the water injection port 17 is connected to the water injection mechanism, and water is injected into the cooling chamber 25 through the water injection mechanism. The water is evenly distributed in the cooling chamber 25, which can accelerate the cooling speed of the mold core 18, thereby shortening the cooling and demolding time of the product. Cooling can also effectively reduce the residual thermal stress inside the product and improve the mechanical properties and service life of the product. It is worth noting that the cooling medium injected into the cooling chamber 25 can be water, oil, gas or antifreeze, etc.

[0035] Embodiment three:

[0036] refer to Figure 7 A round hole 20 is provided at one end of the extension rod 19. A rope is passed through the inside of the round hole 20 to assist the boom in carrying the mold core 18 under force.

[0037] Embodiment 4:

[0038] refer to Figure 2-Figure 5 A hollow groove 14 is formed on the surface of the mold groove 13 , and the hollow groove 14 is concentric with the semicircular end of the mold groove 13 . An ejection assembly 21 is formed inside the hollow groove 14 .

[0039] In the above scheme, the ejector assembly 21 is responsible for ejecting the molded product from the mold core 18 after the mold is opened, so that the worker can take it out and process it in the next step, and eject the product from the mold to ensure the efficiency of mold production and the quality of the product. The ejector assembly 21 can reduce the manual operation of workers to take out the product and reduce the labor intensity of workers. The ejector assembly 21 is installed in the injection molding machine.

[0040] The specific implementation process of this embodiment is as follows:

[0041] The mold groove 13 and the mold core 18 are smoothly inserted and assembled from the side, and the extension rod 19 is embedded in the limiting hole 15. The outer surface of the extension rod 19 is provided with a threaded structure, and the nut is rotated on the extension rod 19 to stabilize the assembly of the mold core 18. When the mold core 18 is fully assembled with the lower mold block 10, the countersunk hole 16 and the threaded hole 23 remain concentric, and the bolt 24 is passed through the countersunk hole 16 and rotated and fixed inside the threaded hole 23, thereby further stabilizing the assembly of the mold core 18.

[0042] Injecting water into the cooling chamber 25 and evenly distributing the water in the cooling chamber 25 can accelerate the cooling speed of the mold core 18, thereby shortening the cooling and demoulding time of the product.

[0043] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Various modifications or equivalent substitutions may be made to the present invention within the essence and protection scope of the present invention. Such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

[0044] In the description of the present utility model, it should be noted that the terms "inside", "front", "back", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the attached circle, or the positions or positional relationships in which the utility model product is usually placed when in use, and are only used to facilitate the description of the utility model and simplify the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position. Therefore, these terms indicating positions or positional relationships cannot be understood as limitations on the present utility model. In the description of the present utility model, it should be further explained that, unless otherwise clearly specified and limited. The terms "set" and "connect" should be understood in a broad sense. For example, these terms can indicate fixed connection, detachable connection or integral connection between elements; they can also indicate mechanical connection, electrical connection; they can also indicate direct connection or indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

Claims

1. A plastic gear injection molding mold, characterized in that: include; A lower module (10), wherein a mold groove (13) is provided on the surface of the lower module (10), and fixing columns (11) are provided at the four corners above the lower module (10); A mold core (18), wherein the mold groove (13) is equipped with the mold core (18), and a cooling mechanism is provided on the mold core (18), wherein the cooling mechanism is used to accelerate the cooling of the mold core (18); An upper module (12), wherein the upper module (12) is inserted into the fixing column (11).

2. The plastic gear injection molding mold according to claim 1, characterized in that: A gear forming groove is provided on the surface of the mold core (18); the mold groove (13) and the mold core (18) are rectangular at the bottom and semicircular at the top; the mold groove (13) and the mold core (18) cooperate with each other.

3. The plastic gear injection molding mold according to claim 2, characterized in that: An extension rod (19) is provided at the semicircular end of the mold core (18), threaded holes (23) are symmetrically provided at the bottom of the rectangular end of the mold core (18), a limiting hole (15) is provided on the side wall of the mold groove (13), and the limiting hole (15) is provided at the semicircular end of the mold groove (13), and countersunk holes (16) are symmetrically provided on the surface of the mold groove (13), and the countersunk holes (16) are provided at the rectangular end of the mold groove (13).

4. The plastic gear injection molding mold according to claim 3, characterized in that: When the mold core (18) and the lower mold block (10) are fully assembled, the extension rod (19) is embedded in the limiting hole (15), and the countersunk hole (16) and the threaded hole (23) remain concentric.

5. The plastic gear injection molding mold according to claim 3, characterized in that: The cooling mechanism comprises a cooling chamber (25), a filling hole (26) is provided on one side of the cooling chamber (25), and a water injection port (17) is provided on the side wall of the mold groove (13), wherein the water injection port (17) is located on the side wall of the rectangular end of the mold groove (13).

6. The plastic gear injection molding mold according to claim 4, characterized in that: A circular hole (20) is formed at one end of the extension rod (19).

7. The plastic gear injection molding mold according to claim 1, characterized in that: A hollow groove (14) is provided on the surface of the mold groove (13), and the hollow groove (14) is concentric with the semicircular end of the mold groove (13). An ejection assembly (21) is provided inside the hollow groove (14).

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