Injection mold with rapid heating and holding function

Abstract

The utility model discloses an injection mold with quick heating and heat preservation function, it includes fixed mould component, movable mould component and forming insert piece, fixed mould component includes fixed mould plate, fixed mould core and first heating part, and the fixed mould core sets up on the fixed mould plate, and the side of fixed mould core is provided with first mounting hole, and first heating part is embedded in first mounting hole, movable mould component includes movable mould plate, movable mould core and second heating part, and the movable mould core sets up on movable mould plate, and the side of movable mould core is provided with second mounting hole, and second heating part is embedded in second mounting hole, forming insert piece includes first insert piece and third heating part, and first insert piece sets up in the side of fixed mould core and movable mould core, and the side of first insert piece is provided with third mounting hole, and third heating part is embedded in third mounting hole, the utility model not only can improve the heating efficiency of mould, save the forming time of product, and the structure of mould is more simple, and the installation is convenient, has reduced the design difficulty and manufacturing cost of mould.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing technology, specifically to an injection mold with rapid heating and heat preservation functions. Background Technology

[0002] Injection molding is a widely used technology in the production of plastic products. Temperature control of the injection mold has a crucial impact on molding efficiency and product quality, especially for plastics with poor flowability or high temperature requirements. Rapidly and uniformly heating the mold cavity to the required temperature is particularly important. Currently, injection molds typically employ the following two heating methods: (1) Heating is achieved by circulating hot oil or hot water in the flow channel inside the mold. This method has the problems of slow heating and inability to meet higher heating temperatures, resulting in long heating time of the mold and low product molding efficiency. In addition, the mold needs to be designed with a complex flow channel structure, which increases the difficulty and cost of mold manufacturing.

[0003] (2) Heating is achieved by wrapping electric heating wire around the outside of the mold core or embedding it inside the mold core. Although this method improves the heating speed and temperature, its installation structure is usually more complicated, resulting in a larger mold volume and higher cost. At the same time, if the mold's heat insulation measures are not adequate, heat is easily lost, leading to increased energy consumption.

[0004] Therefore, there is an urgent need for an injection mold that can achieve rapid and efficient heating, while also being simple in structure, easy to install, and having good thermal insulation properties. Utility Model Content

[0005] The purpose of this invention is to provide an injection mold with rapid heating and heat preservation functions, which can significantly improve heating efficiency while reducing the difficulty and cost of mold manufacturing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An injection mold with rapid heating and heat preservation functions includes a fixed mold assembly, a moving mold assembly, and molding inserts; The fixed mold assembly includes a fixed mold plate, a fixed mold core, and a first heating element. The fixed mold core is disposed on the fixed mold plate, and a first mounting hole is provided on the side of the fixed mold core. The first heating element is embedded in the first mounting hole. The moving mold assembly includes a moving mold plate, a moving mold core, and a second heating element. The moving mold core is disposed on the moving mold plate, and a second mounting hole is provided on the side of the moving mold core. The second heating element is embedded in the second mounting hole. The molding insert includes a first insert and a third heating element. The first insert is disposed on the side of the fixed mold core and the moving mold core. A third mounting hole is provided on the side of the first insert, and the third heating element is embedded in the third mounting hole. The fixed mold core, the moving mold core, and the first insert together form an injection molding cavity.

[0007] Furthermore, the number of the first mounting hole, the second mounting hole, and the third mounting hole is at least two, and the first mounting hole, the second mounting hole, and the third mounting hole are respectively arranged around the injection molding cavity, and the first heating element, the second heating element, and the third heating element are respectively embedded in each of the first mounting hole, the second mounting hole, and the third mounting hole.

[0008] Furthermore, the first mounting hole is arranged symmetrically in the horizontal direction, the second mounting hole is arranged symmetrically in the horizontal direction, and the first mounting hole is parallel to the second mounting hole, while the third mounting hole is arranged symmetrically in the vertical direction.

[0009] Furthermore, there are two of each of the first, second, and third mounting holes. The first, second, and third heating elements are all electric heating rods. The distance between the first heating element and the inner wall of the fixed mold core, the distance between the second heating element and the moving mold core, and the distance between the third heating element and the first insert are all not less than 8 mm.

[0010] Furthermore, a top bakelite board is provided on the top of the fixed mold core, and an upper bakelite board is embedded on the periphery of the fixed mold core.

[0011] Furthermore, a lower bakelite board is embedded around the periphery of the moving mold core, and a bottom bakelite board is provided at the bottom of the moving mold core.

[0012] Furthermore, the upper bakelite board is flush with the peripheral surface of the fixed mold core, the top bakelite board is flush with the edges of the upper bakelite board and the fixed mold core, the lower bakelite board is flush with the peripheral surface of the moving mold core, and the bottom bakelite board is flush with the edges of the lower bakelite board and the moving mold core.

[0013] Furthermore, the fixed mold core has several upper grooves on its periphery, and the upper bakelite board is embedded in the upper grooves; the moving mold core has several lower grooves on its periphery, and the lower bakelite board is embedded in the lower grooves.

[0014] Furthermore, the fixed mold core is provided with an injection port, and a fourth mounting hole is provided on the side of the injection port. A second insert is embedded in the fourth mounting hole, the second insert extends into the injection cavity, and an exhaust channel is formed between the second insert and the fourth mounting hole.

[0015] Furthermore, the fourth mounting hole includes an upper opening and a lower opening, which together form a stepped hole. The upper opening is provided with a foolproof structure. The second insert includes a body and a mounting portion disposed on the upper end of the body. The body is movably embedded in the lower opening, and the mounting portion is limited to the upper opening and adapted to the shape of the upper opening.

[0016] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: 1. This utility model directly installs the heating element into the fixed mold core, moving mold core and molding insert by embedding. This not only enables rapid heating of the injection cavity and the achievement of higher temperatures, but also significantly improves the heating efficiency of the mold and saves the molding time of the product. Moreover, compared with the design of complex flow channel structures or the winding of heating wires, the mold structure is simpler and easier to install, reducing the design difficulty and manufacturing cost of the mold.

[0017] 2. This utility model utilizes the excellent thermal insulation properties of bakelite boards to form thermal insulation layers on each surface of the moving and fixed mold cores, which can effectively reduce heat loss and save energy consumption, thereby improving the thermal insulation performance of the mold.

[0018] 3. In this utility model, the bakelite board is embedded into the mold core, which does not increase the volume of the mold. The structure is compact, and the bakelite board is installed by embedding into the groove, which has the advantages of convenient installation and stable structure.

[0019] 4. In this utility model, the first heating element, the second heating element, and the third heating element are respectively arranged around the injection molding cavity, and the first heating element and the second heating element arranged in parallel in the horizontal direction and the third heating element arranged in the vertical direction form a three-dimensional heating structure, which can make the heating of the injection molding cavity more uniform and ensure the molding quality of the product.

[0020] 5. The insert integrated on the fixed mold core forms an exhaust channel, which can promptly discharge gas from the injection cavity, prevent injection defects caused by gas retention, and thus improve the molding quality of the product. Furthermore, the insert on the fixed mold core is installed and fixed through stepped holes and a foolproof structure, which is more convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of a partial structure of the present invention; Figure 3 for Figure 2 A partial structural diagram; Figure 4 for Figure 3 A schematic diagram of the decomposition process; Figure 5 This is a schematic diagram showing the moving mold core and the fixed mold core in the mold-closed state. Figure 6 This is a schematic diagram of the moving mold core and the fixed mold core; Figure 7 for Figure 5 A sectional view; Figure 8 This is a schematic diagram of the structure of the fixed mold core and the second insert.

[0022] Explanation of reference numerals in the attached figures: Fixed mold assembly 100, fixed template 110, fixed mold core 120, first mounting hole 121, upper groove 122, injection port 123, fourth mounting hole 124, upper opening 1241, lower opening 1242, first heating element 130, top bakelite board 140, upper bakelite board 150; Moving mold assembly 200, moving template 210, moving mold core 220, second mounting hole 221, lower groove 222, second heating element 230, lower bakelite board 240, bottom bakelite board 250; Molded insert 300, first insert 310, third mounting hole 311, third heating element 320; Second insert 400, body 410, mounting part 420, exhaust channel 430. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, it should be noted that: The terms “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “inner,” and “outer” are based on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or element of this utility model must have a specific orientation and therefore should not be construed as a limitation on this utility model.

[0024] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0025] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Example 1 Cooperate Figure 1 and Figure 2 As shown, this embodiment discloses an injection mold with rapid heating and heat preservation functions, including a fixed mold assembly 100, a moving mold assembly 200, and a molding insert 300.

[0027] Cooperate Figure 1 , Figures 3 to 6 As shown, the fixed mold assembly 100 includes a fixed mold plate 110, a fixed mold core 120 and a first heating element 130. The fixed mold core 120 is mounted on the fixed mold plate 110 by means of screws or positioning pins, etc. A first mounting hole 121 is provided on the side of the fixed mold core 120, and the first heating element 130 is embedded in the first mounting hole 121.

[0028] The moving mold assembly 200 includes a moving mold plate 210, a moving mold core 220 and a second heating element 230. The moving mold core 220 is disposed on the moving mold plate 210, and a second mounting hole 221 is provided on the side of the moving mold core 220. The second heating element 230 is embedded in the second mounting hole 221.

[0029] The molding insert 300 includes a first insert 310 and a third heating element 320. The first insert 310 is disposed on the side of the fixed mold core 120 and the moving mold core 220. A third mounting hole 311 is provided on the side of the first insert 310, and the third heating element 320 is embedded in the third mounting hole 311. Depending on actual needs, the first insert 310 can be disposed on the moving mold plate 210 or the fixed mold plate 110, and the number and structure of the first insert 310 can be set or selected according to the shape of the product. The first insert 310, together with the fixed mold core 120 and the moving mold core 220, forms the injection molding cavity.

[0030] Driven by the injection molding machine, the moving mold assembly 200 moves toward the fixed mold assembly 100 until the fixed mold core 120 and the moving mold core 220 are tightly closed, forming a closed injection cavity together with the first insert 310. When the first heating element 130, the second heating element 230 and the third heating element 320 work, they quickly generate heat, causing the fixed mold core 120, the moving mold core 220 and the first insert 310 to heat up rapidly, so that the injection cavity can heat up to the preset molding temperature more quickly.

[0031] The number of first mounting holes 121, second mounting holes 221, and third mounting holes 311 is at least two, and the first mounting holes 121, second mounting holes 221, and third mounting holes 311 are elongated holes, respectively arranged around the injection cavity. Each of the first mounting holes 121, second mounting holes 221, and third mounting holes 311 is respectively embedded with a first heating element 130, a second heating element 230, and a third heating element 320. Compared with the design of complex flow channel structures or the winding of heating wires, this method has a simpler structure, is more convenient to install, and reduces the design difficulty and manufacturing cost of the mold. The distance between the first heating element 130 and the inner wall of the fixed mold core 120, the distance between the second heating element 230 and the inner wall of the moving mold core 220, and the distance between the third heating element 320 and the inner wall of the first insert 310 are all not less than 8mm. Preferably, the distance is designed to be 10mm to 15mm. This distance setting can ensure that the heating element effectively heats the injection cavity and ensures rapid temperature rise, and can also effectively avoid overheating of the injection cavity or excessively rapid temperature rise, which may lead to product deformation or cracking.

[0032] In this embodiment, there are two of each of the first mounting hole 121, the second mounting hole 221, and the third mounting hole 311. The first heating element 130, the second heating element 230, and the third heating element 320 are all electric heating rods, which can be purchased as standard industrial parts for assembly and use. The appropriate power is selected according to the heating temperature and heating rate required by the injection molding cavity.

[0033] In this embodiment, the first mounting hole 121 is arranged symmetrically in the horizontal direction, the second mounting hole 221 is arranged symmetrically in the horizontal direction, and the first mounting hole 121 and the second mounting hole 221 are parallel. The third mounting hole 311 is arranged symmetrically in the vertical direction. This design can ensure that heat can be transferred evenly and quickly to the entire injection cavity, avoiding local overheating or uneven heating.

[0034] Example 2 Cooperate Figures 3 to 6 As shown, the difference between this embodiment and Implementation 1 is that: A top bakelite board 140 is provided on the top of the fixed mold core 120, and an upper bakelite board 150 is embedded around the periphery of the fixed mold core 120. The heat insulation properties of the top bakelite board 140 and upper bakelite board 150 effectively reduce heat loss from the top and sides of the fixed mold core 120 to the outside. A lower bakelite board 240 is embedded around the periphery of the moving mold core 220, and a bottom bakelite board 250 is provided at the bottom of the moving mold core 220. The heat insulation properties of the bottom bakelite board 250 and lower bakelite board 240 effectively reduce heat loss from the bottom and sides of both the fixed and moving mold cores to the outside. By providing bakelite boards around the periphery and top of the fixed mold core 120, and embedding them around the periphery and bottom of the moving mold core 220, a comprehensive insulation layer is constructed using the heat insulation properties of the bakelite boards, significantly reducing heat loss from both the fixed mold core 120 and the moving mold core 220 to the external environment, thus achieving the functions of heat preservation and energy reduction.

[0035] The upper bakelite board 150 is flush with the peripheral surface of the fixed mold core 120; the top bakelite board 140 is flush with the edges of the upper bakelite board 150 and the fixed mold core 120; the lower bakelite board 240 is flush with the peripheral surface of the moving mold core 220; and the bottom bakelite board 250 is flush with the edges of the lower bakelite board 240 and the moving mold core 220. This flush design ensures the flatness of the mold's mating surfaces and does not affect the normal opening, closing, and sealing of the mold.

[0036] The fixed mold core 120 has several upper grooves 122 on its periphery, and the upper bakelite board 150 is embedded in the upper grooves 122. The moving mold core 220 has several lower grooves 222 on its periphery, and the lower bakelite board 240 is embedded in the lower grooves 222 (the bakelite board and the grooves can be installed by interference fit, or by applying glue and then tightly embedding them). The upper bakelite board 150 and the lower bakelite board 240 are embedded in the periphery of the mold core, which is not only convenient and reliable to install, but also integrates the bakelite board with the mold core as a whole, without increasing the overall size of the mold, thus achieving a unity of heat insulation function and structural compactness.

[0037] Example 3 Cooperate Figures 5 to 8 As shown, the difference between this embodiment and Implementation 1 is that: The fixed mold core 120 is provided with an injection port 123, which is connected to the injection cavity for injecting molten plastic. A fourth mounting hole 124 is provided on the side of the injection port 123. A second insert 400 is embedded in the fourth mounting hole 124. The second insert 400 extends into the injection cavity, and an exhaust channel 430 is formed between the second insert 400 and the fourth mounting hole 124. Compared with the integral molding part at the bottom of the fixed mold core 120, this design can timely exhaust the gas in the injection cavity, prevent injection defects caused by gas retention, ensure that the molten plastic fills the injection cavity smoothly, and thus improve the molding quality of the product.

[0038] The fourth mounting hole 124 includes an upper opening 1241 and a lower opening 1242, which together form a stepped hole. The upper opening 1241 is equipped with a foolproof structure. The second insert 400 includes a body 410 and a mounting portion 420 disposed on the upper end of the body 410. The body 410 is movably inserted into the lower opening 1242, and the mounting portion 420 is confined to the upper opening 1241 and is adapted to the shape of the upper opening 1241. In this embodiment, after the body 410 is inserted into the lower opening 1242, there is a small gap between them, forming an exhaust channel to discharge gas from the injection molding cavity. The size of the mounting portion 420 is slightly smaller than that of the upper opening 1241, and it is fixed to the upper opening 1241 by means of adhesive, welding, etc. The fourth mounting hole 124 adopts the above-mentioned stepped hole structure, which facilitates the positioning and installation of the second insert 400.

[0039] In this embodiment, the lower opening 1242 has a circular cross-sectional shape, while the upper opening 1241's anti-mistake structure can have any shape other than a circle. A circular chamfered hole is preferred, as it is a simple and effective anti-mistake structure that is easy to manufacture. Furthermore, it should be noted that the anti-mistake structure can also be located at the lower opening 1242, as long as it facilitates the positioning and assembly of the second insert 400. This embodiment does not impose any restrictions on this. By setting the lower opening 1242 to a circular shape and providing an anti-mistake structure at the upper opening 1241 that is compatible with the mounting portion 420, the positioning and assembly of the second insert 400 are facilitated, improving assembly efficiency.

[0040] This invention integrates the heating element directly into the mold core and insert, enabling rapid heating of the injection cavity and achieving higher temperatures. Compared to traditional mold heating methods, this significantly improves heating efficiency, saves molding time, and shortens the production cycle. The embedded bakelite board forms a comprehensive heat insulation layer, effectively reducing heat loss and saving energy while maintaining a compact structure, achieving excellent heat insulation. Furthermore, the insert integrated into the fixed mold core allows for timely venting of gas from the injection cavity, preventing injection defects caused by gas retention and improving product molding quality. The stepped holes and foolproof structure facilitate easy installation and fixation of the insert. Therefore, this invention has a reasonable overall structure and significantly improves injection molding efficiency and product quality.

[0041] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. An injection mold with rapid heating and heat preservation functions, characterized in that: Includes fixed mold assembly, moving mold assembly, and molding inserts; The fixed mold assembly includes a fixed mold plate, a fixed mold core, and a first heating element. The fixed mold core is disposed on the fixed mold plate, and a first mounting hole is provided on the side of the fixed mold core. The first heating element is embedded in the first mounting hole. The moving mold assembly includes a moving mold plate, a moving mold core, and a second heating element. The moving mold core is disposed on the moving mold plate, and a second mounting hole is provided on the side of the moving mold core. The second heating element is embedded in the second mounting hole. The molding insert includes a first insert and a third heating element. The first insert is disposed on the side of the fixed mold core and the moving mold core. A third mounting hole is provided on the side of the first insert, and the third heating element is embedded in the third mounting hole. The fixed mold core, the moving mold core, and the first insert together form an injection molding cavity.

2. The injection mold with rapid heating and heat preservation functions as described in claim 1, characterized in that: The number of the first mounting hole, the second mounting hole, and the third mounting hole is at least two, and the first mounting hole, the second mounting hole, and the third mounting hole are respectively arranged around the injection molding cavity. The first heating element, the second heating element, and the third heating element are respectively embedded in each of the first mounting hole, the second mounting hole, and the third mounting hole.

3. The injection mold with rapid heating and heat preservation functions as described in claim 2, characterized in that: The first mounting hole is arranged symmetrically in the horizontal direction, the second mounting hole is arranged symmetrically in the horizontal direction, and the first mounting hole and the second mounting hole are parallel to each other. The third mounting hole is arranged symmetrically in the vertical direction.

4. An injection mold with rapid heating and heat preservation functions as described in any one of claims 1-3, characterized in that: The number of the first mounting hole, the second mounting hole, and the third mounting hole are all two. The first heating element, the second heating element, and the third heating element are all electric heating rods. The distance between the first heating element and the inner wall of the fixed mold core, the distance between the second heating element and the moving mold core, and the distance between the third heating element and the first insert are all not less than 8mm.

5. An injection mold with rapid heating and heat preservation functions as described in claim 1, characterized in that: The top of the fixed mold core is provided with a top bakelite board, and the periphery of the fixed mold core is inlaid with an upper bakelite board.

6. The injection mold with rapid heating and heat preservation functions as described in claim 5, characterized in that: The moving mold core has a lower bakelite board embedded on its periphery, and a bottom bakelite board is provided at the bottom of the moving mold core.

7. An injection mold with rapid heating and heat preservation functions as described in claim 6, characterized in that: The upper bakelite board is flush with the peripheral surface of the fixed mold core, the top bakelite board is flush with the edges of the upper bakelite board and the fixed mold core, the lower bakelite board is flush with the peripheral surface of the moving mold core, and the bottom bakelite board is flush with the edges of the lower bakelite board and the moving mold core.

8. An injection mold with rapid heating and heat preservation functions as described in claim 7, characterized in that: The fixed mold core has several upper grooves on its periphery, and the upper bakelite board is embedded in the upper grooves. The moving mold core has several lower grooves on its periphery, and the lower bakelite board is embedded in the lower grooves.

9. An injection mold with rapid heating and heat preservation functions as described in claim 1, characterized in that: The fixed mold core is provided with an injection port, and a fourth mounting hole is provided on the side of the injection port. A second insert is embedded in the fourth mounting hole. The second insert extends into the injection cavity, and an exhaust channel is formed between the second insert and the fourth mounting hole.

10. An injection mold with rapid heating and heat preservation functions as described in claim 9, characterized in that: The fourth mounting hole includes an upper opening and a lower opening, which together form a stepped hole. The upper opening is provided with a foolproof structure. The second insert includes a body and a mounting part disposed on the upper end of the body. The body is movably embedded in the lower opening, and the mounting part is limited to the upper opening and is adapted to the shape of the upper opening.

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