CN214056267U - High-temperature injection mold heat balance structure - Google Patents

Abstract

The utility model discloses a high temperature injection mold heat balance structure, including mould benevolence, heat conversion piece, heating template and heating element, heat conversion piece central authorities are equipped with mould benevolence cooperation, are used for installing the first framed of mould benevolence, and mould benevolence is inlayed in first framed, evenly conducts to mould benevolence with the heat that will heat the template through the heat conversion piece. Like this mould benevolence is located heat conversion piece central authorities, heat conversion piece is with the even parcel of mould benevolence, the heating template heaies up in heating element heating process, pass through the heat conversion piece after with the even conversion of heat again, conduction and diffusion transfer to mould benevolence part, can effectively eliminate the unbalanced temperature of traditional heating combination, optimize the mould benevolence die cavity part difference in temperature of traditional structure more than 50 ℃ to below 5 ℃, thereby effectively avoid leading to injection moulding product to warp and the problem that the crystallization degree difference influences product performance because of the mould benevolence difference in temperature, effectively improve injection moulding product's quality, it is poor to have solved among the prior art high temperature mould production process heat balance, the problem of temperature out of control.

Description

High-temperature injection mold heat balance structure

Technical Field

The utility model relates to a high temperature injection mold technical field, more specifically say, relate to a high temperature injection mold heat balance structure.

Background

With the emergence of new technology, metal parts in many fields are gradually replaced by some injection molding materials with high special high-temperature stability, and the related fields include aerospace, medical treatment (orthopedics, sports medicine and auxiliary tools for relevant fixing), automobiles, special cold-resistant and heat-resistant electronic products and the like, such as PEEK, PEK, PSU, PEI, PPSU and the like, which are all realized by high-temperature mold injection molding. The high-temperature die commonly used in the industry is controlled by oil temperature, but the oil temperature control is limited strongly and has higher risk, and if the high temperature in the production process causes the joint to be released or the oil pipe to burst, the high-temperature die can cause injury to operators. Moreover, when used in the production of medical products, oil vapor or leakage is easily generated, which may cause pollution of clean environment or product. At present, the direct electric heating control is mainly used in the industry, the design that a cylindrical heating rod is directly embedded into a mold core part is adopted, but the temperature difference of the positions far away from the heating rod and embedded into the heating rod is as high as 50-80 ℃, the temperature difference of a mold cavity is larger, the heat balance is very poor, the temperature is easy to lose control, and the crystallinity of a product is insufficient, so that the function is failed. The product that moulds plastics like this outward appearance is not good, and the crystallization degree difference influences the intensity and the performance of product, and the product is serious because of the deformation that the temperature difference leads to, and size precision is out of control. Therefore, how to solve the problems of poor heat balance and temperature runaway in the production process of the high-temperature die in the prior art becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high temperature injection mold heat balance structure to solve the problem that heat balance nature is poor, the temperature is out of control among the prior art high temperature mold production process.

The utility model aims at realizing through the following technical scheme:

the utility model provides a pair of high temperature injection mold heat balance structure, including mould benevolence, with mould benevolence is connected, is used for making mould benevolence thermally equivalent's heat conversion piece, with the heating template that the thermally equivalent piece is connected, and set up heating element on the heating template, the central authorities of thermally equivalent piece be equipped with mould benevolence cooperatees, is used for the installation the first framed of mould benevolence, mould benevolence is inlayed in the first framed, in order to pass through the thermally equivalent piece will the heat uniform conduction of heating template extremely mould benevolence.

Preferably, the material of the heat conversion block is beryllium copper.

Preferably, the heating device further comprises a temperature sensor for detecting the temperature of the heating template and a controller electrically connected with the temperature sensor and the heating assembly, wherein when the temperature sensor detects that the temperature of the heating template is higher than a preset temperature, the controller controls the heating assembly to stop heating, and when the temperature sensor detects that the temperature of the heating template is lower than the preset temperature, the controller controls the heating assembly to start heating.

Preferably, the temperature sensor is a thermocouple.

Preferably, the heating assembly comprises two heating rods uniformly distributed on the heating template, and the two temperature sensors are arranged in one-to-one correspondence with the heating rods.

Preferably, a heat dissipation channel is arranged on the end surface of the mold core, which is in contact with the heat conversion block.

Preferably, the width W of the heat dissipation channel is 4 mm to 6 mm, and the depth H of the heat dissipation channel is 0.8 mm to 1.2 mm.

Preferably, the heat dissipation channel includes an annular channel disposed around the center of the mold core and a plurality of branch channels distributed along the circumferential direction of the annular channel and extending to the outer edge of the mold core.

Preferably, a second mold frame matched with the heat conversion block and used for installing the heat conversion block is arranged in the center of the heating mold plate, and the heat conversion block is embedded in the second mold frame.

Preferably, the heating template is provided with two first mounting holes and two second mounting holes arranged along the length direction of the heating template, the first mounting holes are used for mounting the heating rod, and the second mounting holes are used for mounting the temperature sensor.

The utility model provides an among the technical scheme, a high temperature injection mold heat balance structure includes mould benevolence, is connected with mould benevolence, is used for making mould benevolence thermally equivalent's heat conversion piece, the heating template that is connected with the heat conversion piece to and set up the heating element on the heating template, the central authorities of heat conversion piece are equipped with and cooperate with mould benevolence, are used for placing the first framed of mould benevolence, mould benevolence is inlayed in first framed, with the heat uniform conduction to mould benevolence through the heat conversion piece with heating template. So set up, mould benevolence is located the central authorities of heat conversion piece, the even parcel of mould benevolence is gone up to the heat conversion piece, the heating template is the rising temperature in heating element heating process, pass through the heat conversion piece after with the even conversion of heat again, conduction and diffusion transmit mould benevolence part, can effectively eliminate the unbalanced temperature of traditional heating combination, optimize the mould benevolence die cavity part difference in temperature of traditional structure more than 50 ℃ to below 5 ℃, thereby effectively avoid leading to injection moulding product to warp and the problem that the crystallization degree difference influences product performance because of the mould benevolence difference in temperature, effectively improve injection moulding product's quality, it is poor to have solved among the prior art high temperature mould production process thermal equilibrium, the problem of temperature out of control.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is an exploded view of a thermal balance structure of a high temperature injection mold according to an embodiment of the present invention;

FIG. 2 is an assembly view of a thermal balance structure of a high temperature injection mold according to an embodiment of the present invention;

fig. 3 is a partial schematic view of a heat dissipation channel according to an embodiment of the present invention;

FIG. 4 is a right side view of FIG. 3;

FIG. 5 is a partial schematic view of a mold insert according to an embodiment of the present invention;

fig. 6 is a partial schematic view of a thermal conversion block in an embodiment of the present invention;

FIG. 7 is a partial schematic view of a heating platen according to an embodiment of the present invention;

fig. 8 is a left side view of fig. 7.

In fig. 1-8:

1-injection molding of products; 2-a mold core; 3-a thermal conversion block; 4-heating the template; 5-a heating assembly; 6-a first mould frame; 7-a second mold frame; 8-a temperature sensor; 9-heating rod; 10-an annular channel; 11-a branch channel; 12-a first mounting hole; 13-a second mounting hole; 14-a third mounting hole; 15-a fourth mounting hole; 16-fasteners.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1-8, the heat balance structure of the high temperature injection mold according to the present embodiment includes a mold core 2, wherein the injection molding product 1 is formed by molding a cavity portion of the mold core 2, and the mold core 2 is made of 8407 (chromium, molybdenum, vanadium alloy tool steel) with high hardness (HRC 48-52); a plurality of heat conversion blocks 3 connected to the mold core 2 for uniformly heating the mold core 2, as shown in fig. 5 and 6, wherein a plurality of third mounting holes 14 are formed at corresponding positions of the mold core 2 and the heat conversion blocks 3, and the third mounting holes 14 are uniformly distributed and fixedly connected to each other by inserting fasteners 16 such as bolts; as shown in fig. 6 and 7, the heating template 4 connected with the heat conversion block 3, the heat conversion block 3 and the heating template 4 are provided with a plurality of fourth mounting holes 15 at corresponding positions, the fourth mounting holes 15 are uniformly distributed, and the heat conversion block 3 and the heating template 4 are fixedly assembled by inserting fasteners 16; and a heating unit 5 disposed on the heating platen 4, as shown in fig. 2, the above parts are assembled together, and heat is uniformly transferred to the cavity 2 in the heating process of the heating unit 5. As shown in fig. 6, the first mold frame 6, which is matched with the mold core 2 and used for installing the mold core 2, is disposed at the center of the heat conversion block 3, and the third installation holes 14 are uniformly distributed in the first mold frame 6, so that the mold core 2 is embedded into the first mold frame 6, and thus the heat of the heating mold plate 4 is uniformly transferred to the mold core 2 through the heat conversion block 3. So set up, mould benevolence is located the central authorities of heat conversion piece, the even parcel of mould benevolence is wrapped up to the heat conversion piece, the heating template risees the temperature in heating element heating process, pass through the heat conversion piece after with the even conversion of heat again, conduction and diffusion transmit mould benevolence part, can effectively eliminate the unbalanced temperature of traditional heating combination, optimize the mould benevolence die cavity part difference in temperature of traditional structure more than 50 ℃ to below 5 ℃, thereby effectively avoid leading to injection moulding product to warp and the crystallization degree difference influences the problem of producing the performance because of mould benevolence difference in temperature, effectively improve injection moulding product's quality, safe and reliable uses, reduce the pollution to the environment, it is poor effectively to have solved among the prior art high temperature mould production process thermal equilibrium, the problem of temperature runaway.

In the present embodiment, the material of the heat conversion block 3 is beryllium copper. Beryllium copper belongs to one of common copper materials, the high-performance beryllium copper mainly surrounds various working conditions of use of nonferrous metal low-pressure and gravity casting dies, and is tin-free bronze taking beryllium as a main alloy component, which contains 1.7-2.5% of beryllium and a small amount of elements such as nickel, chromium, titanium and the like, and after quenching and aging treatment, the strength limit can reach 1250 + 1500MPa, which is close to the level of medium-strength steel. Has good plasticity in a quenching state and can be processed into various semi-finished products. Beryllium bronze has very high hardness (HRC38-44), elastic limit, fatigue limit and wear resistance, and has excellent thermal conductivity and thermal diffusion. Design like this, although the heating form is high from the position temperature that heating element is close, and the position temperature far away from heating element is low, has the temperature difference of different positions, but through the heat-conduction characteristic of thermal conversion piece efficient and thermal even conversion back, effectively transmit the mould benevolence part with the unbalanced temperature of heating element with the heating form through the conduction and the diffusion of thermal conversion piece, with the difference in temperature control within 5 ℃, effectively solve the condition that high temperature mould production process temperature is out of control. In actual production, as shown in fig. 2, the heating template 4 and the mold core 2 are correspondingly divided into four measuring areas, namely, a left lower area, a left upper area, a right lower area and a right upper area. Opening the heating assembly, adopting the high-precision temperature measuring instrument to respectively carry out temperature measurement on the four regions, and displaying the measurement result: the measurement temperatures of the four regions of the heating template 4 are 176 ℃, 170 ℃, 157 ℃ and 144 ℃ in sequence, and the measurement temperatures of the four regions of the mold core 2 corresponding to the four regions are 177 ℃, 178 ℃, 176 ℃ and 176 ℃ in sequence. According to the measurement result, the temperature of the position on the heating template 4 close to the heating assembly is relatively high, the temperature of the position far away from the heating assembly is relatively low, and the temperature difference is relatively large; the temperature difference of each measuring area on the die core 2 is not large, and the temperature difference is within 5 ℃. Therefore, the heat conversion block 3 has efficient heat conductivity, can uniformly convert heat, effectively eliminates the unbalanced temperature of the heating template 4 through the heat conversion block 3, achieves the uniform heating of the mold core 2, avoids the problems of serious deformation and out-of-control size precision of the product due to temperature difference, and effectively ensures the strength and performance of the product.

As shown in fig. 1, the heating mold plate 4 is provided at the center thereof with a second mold frame 7 fitted with the heat conversion block 3 for mounting the heat conversion block 3, the heat conversion block 3 is embedded in the second mold frame 7, the fourth mounting holes 15 are uniformly distributed in the second mold frame 7, and the core 2 and the heat conversion block 3 are assembled in the heating mold plate 4 by inserting fasteners 16. Specifically, the mold core 2, the heat conversion block 3 and the heating template 4 are all square structures, and the whole design is uniform and symmetrical, so that the uniform diffusion of heat is facilitated.

In a preferred embodiment of the present invention, the high temperature injection mold heat balance structure further includes a temperature sensor 8 for detecting the temperature of the heating mold plate, and a controller electrically connected to both the temperature sensor 8 and the heating assembly 5. When the temperature sensor 8 detects that the temperature of the heating template 4 is higher than the preset temperature, the controller controls the heating assembly 5 to stop heating. When the temperature sensor 8 detects that the temperature of the heating template 4 is lower than the preset temperature, the controller controls the heating assembly 5 to start heating. Set up like this, the mould temperature heats according to actual demand, and through the temperature control system that temperature sensor and controller formed, can invariably control in stable acceptable within range, improved the temperature control precision, effectively guarantee injection moulding product's shaping quality.

Specifically, the temperature sensor 8 is a thermocouple. The thermocouple is a commonly used temperature measuring element, and has simple structure and convenient use. Heating element 5 includes two evenly distributed heating rods 9 on heating template 4, and temperature sensor 8 is two and sets up with each heating rod 9 one-to-one, measures more accurately like this, improves accuse temperature precision. During production, the heating rod is heated, and when the heating temperature measured by the thermocouple reaches the preset temperature, a signal is sent to the controller, so that the heating rod is controlled to be powered off and stop heating. It should be noted that the controller is a mature product, and the controller controls the heating rod according to the measurement data of the thermocouple is a mature technology, so the specific connection structure and the electrical connection relationship thereof are not described herein again.

As shown in fig. 1, the heating form 4 is provided with two first mounting holes 12 and two second mounting holes 13 along the length direction thereof, the first mounting holes 12 are used for mounting the heating rod 9, and the second mounting holes 13 are used for mounting the temperature sensor 8. Thus, the whole heating of the heating template is facilitated, and the heat conduction efficiency is accelerated. Specifically, the heating rod and the thermocouple are inserted into the mounting hole and fixed to the heating template by bolts. In the arrangement position of the heating form shown in fig. 1, the left-right direction in the drawing is the longitudinal direction thereof. As shown in fig. 8, the first mounting holes 12 and the second mounting holes 13 are symmetrically distributed, so that the heating efficiency can be improved, the heating of the heating template is uniform, and the temperature difference is minimized.

As an alternative embodiment, a heat dissipation channel is provided on the end surface of the mold core 2 contacting the heat conversion block 3. In actual production, a heat dissipation channel needs to be designed between the mold core and the heat conversion block according to the structural shape characteristics of an injection molding product, the heat dissipation channel can effectively improve the hot air circulation efficiency, meanwhile, the down regulation and the rise of heat can be balanced, and the temperature change amplitude is reduced. In addition, a heat dissipation channel can be designed on the bottom surface or the side surface of the heat conversion block, which is contacted with the mold core. As shown in fig. 4, the width W of the heat dissipation channel is 4 mm to 6 mm, preferably 5 mm. The depth H of the heat dissipation channel is 0.8 mm to 1.2 mm, preferably 1 mm. It should be noted that, as shown in fig. 3, the distance between the two side edges of the heat dissipation channel is its width, and the distance recessed inward from the plane of the paper is its depth.

In the embodiment of the present invention, as shown in fig. 3, the heat dissipation channel includes an annular channel 10 disposed around the center of the mold core 2 and a plurality of branch channels 11 distributed along the circumferential direction of the annular channel 10 and extending to the outer edge of the mold core 2. The branch channels 11 are distributed in a shape like a Chinese character 'mi' and are evenly distributed on the bottom surface of the die core 2, so that hot air can evenly circulate on the whole plane, and the temperature of the die cavity part of the die core can be even and consistent with one another with higher precision. Of course, in other embodiments, the heat dissipation channel can be designed in other forms according to the shape of the product.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a high temperature injection mold heat balance structure, its characterized in that, including mould benevolence (2), with mould benevolence (2) are connected, are used for making mould benevolence (2) thermally equivalent block (3), with heating template (4) that thermally equivalent block (3) are connected, and set up heating element (5) on the heating template (4), the central authorities of thermally equivalent block (3) be equipped with mould benevolence (2) cooperate, be used for the installation first framed (6) of mould benevolence (2), mould benevolence (2) are inlayed in first framed (6), with pass through thermally equivalent block (3) will the heat homogeneous conduction of heating template (4) extremely mould benevolence (2).

2. A high temperature injection mold heat balance structure as claimed in claim 1, wherein the material of the heat conversion block (3) is beryllium copper.

3. The high temperature injection mold heat balance structure of claim 1, further comprising a temperature sensor (8) for detecting the temperature of the heating platen and a controller electrically connected to both the temperature sensor (8) and the heating assembly (5), wherein the controller controls the heating assembly (5) to stop heating when the temperature sensor (8) detects that the temperature of the heating platen (4) is higher than a preset temperature, and controls the heating assembly (5) to start heating when the temperature sensor (8) detects that the temperature of the heating platen (4) is lower than the preset temperature.

4. A high temperature injection mold heat balance structure as claimed in claim 3, wherein said temperature sensor (8) is a thermocouple.

5. A high-temperature injection mold heat balance structure as claimed in claim 3, wherein said heating assembly (5) comprises two heating rods (9) uniformly distributed on said heating mold plate (4), and said temperature sensors (8) are two and arranged in one-to-one correspondence with each of said heating rods (9).

6. The heat balance structure of high temperature injection mold according to claim 1, wherein the end surface of the mold core (2) contacting the heat conversion block (3) is provided with a heat dissipation channel.

7. The heat balance structure of a high temperature injection mold according to claim 6, wherein the width W of the heat dissipation channel is 4 mm to 6 mm, and the depth H of the heat dissipation channel is 0.8 mm to 1.2 mm.

8. The heat balance structure of high temperature injection mold according to claim 6, wherein the heat dissipation channel comprises an annular channel (10) disposed around the center of the mold core (2) and a plurality of branch channels (11) distributed along the circumference of the annular channel (10) and extending to the outer edge of the mold core (2).

9. A high-temperature injection mold heat balance structure as claimed in claim 1, wherein the heating mold plate (4) is centrally provided with a second mold frame (7) fitted with the heat conversion block (3) for mounting the heat conversion block (3), and the heat conversion block (3) is embedded in the second mold frame (7).

10. A high temperature injection mold heat balance structure as defined in claim 5, wherein said heating platen (4) is provided with two first mounting holes (12) and two second mounting holes (13) along its length direction, said first mounting holes (12) being used for mounting said heating rod (9), said second mounting holes (13) being used for mounting said temperature sensor (8).

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