CN213082263U - Quick heating device for die - Google Patents

Abstract

The utility model discloses a mould rapid heating device, include: the mould with magnetic conductivity, locate the solenoid in the cavity of mould and be used for controlling whether controlling means that solenoid circular telegram is, the top of mould is equipped with and is used for holding the injection moulding liquid so that the fashioned heating surface of part, and solenoid is connected with controlling means. Because the solenoid of this device sets up in the mould, so solenoid's heating operation all can be gone on under the die sinking and compound die state of mould, and this device need not to increase mobile device and space and carries out solenoid's heating removal operation, and this makes mould heating operation simple, has improved part production efficiency, can not increase the production cycle of mould heating time and part. In addition, the device has simple structure and convenient operation, and can be popularized and used.

Description

Quick heating device for die

Technical Field

The utility model relates to an injection moulding technical field, more specifically say, relate to a mould rapid heating device.

Background

In the prior art, the injection molding process has obvious influence on the quality of plastic parts, the higher temperature of the mold can improve the filling speed of a solution, reduce the injection molding pressure and improve the quality of the parts, for example, the surface defects of welding lines, jet marks, thin walls, local marks, marks and the like of the parts can be effectively improved.

At present, in order to improve the surface quality of parts, the overall mold temperature of an injection mold is usually increased so as to enable the mold temperature to reach a temperature above the glass transition temperature, and for most parts, the conventional mold temperature or slightly higher than the conventional mold temperature can meet the injection molding requirement of non-defective areas of the parts; but for the defect areas such as welding lines, jet marks and the like, the surface defects of the parts cannot be removed by the conventional mold temperature.

The injection molding industry can adopt an electromagnetic induction heating mode to increase the temperature of the mold so as to enable the temperature of the mold to rise above the glass transition temperature. And generally adopt integral heating form when carrying out electromagnetic induction heating to the mould, also carry out electromagnetic induction heating to the whole shaping region of mould, because the heating range of mould is great for the required power of electromagnetic induction heating is great, the energy consumption is higher, also can make mould cooling time of a specified duration, part production cycle is longer. Moreover, generally be the external induction heating form when utilizing electromagnetic induction technology to heat the mould, consequently, can only carry out electromagnetic induction heating to the mould under the die sinking state, relevant equipment and space need be increased so that heating equipment removes to this process, and this can lead to electromagnetic induction heating's control system and moving mechanism comparatively complicated for mould heating operation is complicated, has reduced part production efficiency, and this process can increase mould heating time, so that increase the whole production cycle of part.

In summary, the problem to be solved by the present technical skill is how to provide a device capable of heating a mold in both mold opening and mold closing states without increasing the production cycle of parts.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a quick heating device of mould, it all can heat the mould under die sinking and compound die state, and this device can not increase part production cycle, and in addition, simple structure, the convenient operation of this device can use widely.

In order to achieve the above object, the present invention provides the following technical solutions:

a rapid heating apparatus for a mold, comprising: the mold comprises a mold with magnetic permeability, an electromagnetic coil arranged in a cavity of the mold and a control device for controlling the electromagnetic coil to be electrified or not, wherein the top of the mold is provided with a surface to be heated for containing injection molding liquid so as to facilitate part molding, and the electromagnetic coil is connected with the control device.

Preferably, the electromagnetic coil is arranged corresponding to the surface to be heated, and the electromagnetic coil is wound on a magnetizer, and the magnetizer is of a T-shaped structure, so that the electromagnetic coil is used for heating one side close to the surface to be heated in a centralized manner.

Preferably, a backing plate is clamped between the inner surface of the chamber and the electromagnetic coil, and the backing plate can insulate heat but cannot conduct magnetism.

Preferably, a first cooling pipeline is arranged in the mold, and the first cooling pipeline is used for cooling the area of the mold except for the surface to be heated.

Preferably, a second cooling pipeline for cooling the surface to be heated is arranged in the mold, and the control device is connected with a switch valve of the second cooling pipeline to control the flow of a cooling medium in the second cooling pipeline.

Preferably, the second cooling pipes are arranged around the surface to be heated, and each of the second cooling pipes is arranged close to the surface to be heated.

Preferably, a temperature sensor for detecting the temperature of the mold is arranged in the mold, and the temperature sensor is connected with the control device.

Preferably, the temperature sensor is arranged between the surface to be heated and the chamber.

Preferably, the mold is provided with a plurality of cavities and the surfaces to be heated, which are arranged corresponding to the cavities, the electromagnetic coils are arranged in each cavity, the control device comprises a plurality of controllers, and the controllers are connected with the electromagnetic coils in a one-to-one correspondence manner.

Use the utility model provides a during mould rapid heating device, if need heat the operation to the mould, accessible controlling means control solenoid circular telegram, then, can produce electromagnetic coupling effect between solenoid and the mould, also the electric current passes through solenoid and produces magnetic field, when the cavity internal surface of magnetic line passing through the mould in the magnetic field, the magnetic line of force is cut to produce countless vortex, make the magnetic molecule high-speed rotation of mould self and produce collision friction heat generation. And then, transferring the heat to the surface to be heated at the top of the mold through the heat conduction effect of the mold so as to enable the surface to be heated to reach the preset temperature. When the surface to be heated reaches the preset temperature, the control device controls the electromagnetic coil to be powered off so as to prevent the mold from being heated continuously, and then injection molding operation can be performed on the surface to be heated.

After the temperature of the die is increased, the filling speed of the solution can be effectively increased, the injection pressure is reduced, the quality of the part is improved, the surface defects of the part and the like are effectively improved, and the surface quality of the part can be effectively improved. Wherein, because the solenoid of this device sets up in the mould, the heating operation of event solenoid all can be gone on under the die sinking and compound die state of mould, and this device need not to increase mobile device and space and carries out solenoid's heating removal operation, and this makes mould heating operation simple, has improved part production efficiency, can not increase the production cycle of mould heating time and part.

To sum up, the utility model provides a mould rapid heating device, it all can heat the mould under die sinking and compound die state, and this device can not increase part production cycle, and in addition, simple structure, convenient operation of this device can use widely.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural view of a rapid heating device for a mold according to the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic diagram of a solenoid coil;

fig. 5 is another schematic diagram of the solenoid.

In fig. 1-5:

the device comprises a mold 1, a part 2, a backing plate 3, a first cooling pipeline 4, a second cooling pipeline 5, a temperature sensor 6, a magnetizer 7, an electromagnetic coil 8, a surface to be heated 9, a cavity 10 and an inner surface 11.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a mould rapid heating device, it all can heat the mould under die sinking and compound die state, and this device can not increase part production cycle, and in addition, simple structure, convenient operation of this device can use widely.

Referring to fig. 1 to 5, fig. 1 is a schematic structural view of a mold rapid heating device provided in the present invention; FIG. 2 is a top view of FIG. 1; FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2; FIG. 4 is a schematic diagram of a solenoid coil; fig. 5 is another schematic diagram of the solenoid.

This embodiment provides a mould rapid heating device, includes: the injection molding machine comprises a mold 1 with magnetic permeability, an electromagnetic coil 8 arranged in a cavity 10 of the mold 1 and a control device for controlling the electrification of the electromagnetic coil 8, wherein the top of the mold 1 is provided with a surface to be heated 9 for containing injection molding liquid so as to facilitate the molding of a part 2, and the electromagnetic coil 8 is connected with the control device.

It should be noted that the mold 1 may be made of steel with magnetic permeability, so that the mold 1 may be heated and cooled efficiently. Since the electromagnetic coil 8 is disposed in the cavity 10 of the mold 1, the electromagnetic coil 8 is not in direct contact with the mold 1, and a space is provided between the electromagnetic coil 8 and the mold 1, and air is present in the space, and the space is insulated by the air, so that the electromagnetic coil 8 is not heated by the heat of the heating mold 1.

In addition, it should be noted that, because the inner surface 11 of the cavity 10 of the mold 1 is close to the electromagnetic coil 8, the electromagnetic induction of the inner surface 11 is the strongest, and the heating amplitude is the largest at this position, and the generated heat is the largest. The heating amplitude of other positions of the die 1 is gradually reduced, and finally the heat is transferred to the surface to be heated 9 of the die 1 through the heat conduction action of the steel. In order to minimize heat transfer losses, the distance between the electromagnetic coil 8 and the surface to be heated 9 should be reduced as much as possible. The shape of the surface to be heated 9, the shape of the electromagnetic coil 8, and the like are not limited. For example, the electromagnetic coil 8 may be provided with one turn, as shown in fig. 4, and the arrow in fig. 4 indicates the flow direction of the induced current. The electromagnetic coil 8 may also be provided in a plurality of turns, as shown in fig. 5.

The shapes, structures, positions and the like of the mold 1, the electromagnetic coil 8, the control device and the surface to be heated 9 can be determined according to actual conditions and actual requirements in the actual application process.

Use the utility model provides a during the quick heating device of mould, if need heat the operation to mould 1, accessible controlling means control solenoid 8 circular telegram, then, can produce electromagnetic coupling effect between solenoid 8 and the mould 1, also the electric current passes through solenoid 8 and produces magnetic field, when the magnetic force line passes through the cavity 10 internal surface 11 of mould 1 in the magnetic field, the magnetic force line is cut to produce countless vortex, make the magnetic molecule high-speed rotation of mould 1 self and produce collision friction thermogenesis. Then, the heat is transferred to the surface to be heated 9 on the top of the mold 1 by the heat conduction function of the mold 1, so that the surface to be heated 9 reaches the preset temperature. When the surface 9 to be heated reaches the preset temperature, the control device controls the electromagnetic coil 8 to be powered off so as to prevent the mold 1 from being heated continuously, and then injection molding operation can be performed on the surface 9 to be heated.

After the temperature of the die 1 is increased, the filling speed of the solution can be effectively increased, the injection pressure is reduced, the quality of the part 2 is improved, the surface defects of the part 2 are effectively improved, and the surface quality of the part 2 can be effectively improved. Wherein, because the solenoid 8 of this device sets up in mould 1, so solenoid 8's heating operation all can be gone on under the die sinking and the compound die state of mould 1, and this device need not to increase mobile device and space and carries out solenoid 8's heating removal operation, and this makes mould 1 heating operation simple, has improved part 2 production efficiency, can not increase the production cycle of mould 1 heating time and part 2.

It should be further noted that the electromagnetic coil 8 of the device is mainly used for heating the surface to be heated 9, and the dynamic temperature control of the local small space of the mold 1 can be realized through the control action of the control device, and the local area of the mold 1 is heated, so that the heating power is small, the heating efficiency is high, meanwhile, the cooling time of the mold 1 can be shortened, and the energy consumption required by the device can be reduced.

To sum up, the utility model provides a mould rapid heating device, it all can heat mould 1 under die sinking and compound die state, and this device can not increase 2 production cycle of part, and in addition, simple structure, convenient operation of this device can use widely.

On the basis of the above embodiment, preferably, the electromagnetic coil 8 is disposed corresponding to the surface to be heated 9, and the electromagnetic coil 8 is wound on the magnetic conductor 7, and the magnetic conductor 7 is of a T-shaped structure, so that the electromagnetic coil 8 heats the side close to the surface to be heated 9 in a concentrated manner.

It should be noted that the magnetizer 7 is an element for controlling the magnetic flux, and it can shield, concentrate or shift the magnetic field to effectively control the induction heating area. After the electromagnetic coil 8 is added with the magnetizer 7, the external magnetic field disappears, the power of the area covered by the electromagnetic coil 8 is increased, and the power of the area outside the area covered by the electromagnetic coil 8 is reduced, so that the electromagnetic coil 8 can heat a certain area more intensively and accurately. Therefore, the magnetic conductor 7 can increase the magnetic induction intensity of the electromagnetic coil 8, and can also minimize the heat loss on the opposite side of the surface to be heated 9.

As shown in fig. 3, the cavity 10 may be aligned with the surface to be heated 9, so that the electromagnetic coil 8 and the surface to be heated 9 are correspondingly disposed, then the electromagnetic coil 8 is attached to the inner surface 11 of the cavity 10, and then the T-shaped magnetizer 7 is inserted into the through hole in the middle of the electromagnetic coil 8, and the T-shaped magnetizer 7 may effectively block the other end of the electromagnetic coil 8, so that the electromagnetic coil 8 intensively heats one side close to the surface to be heated 9, thereby effectively improving the heating speed and the heating efficiency of the mold 1.

Preferably, a shim plate 3 is interposed between the inner surface 11 of the chamber 10 and the electromagnetic coil 8, the shim plate 3 being thermally but magnetically impermeable.

It should be noted that, because the inner surface 11 of the chamber 10 is closest to the electromagnetic coil 8, the electromagnetic induction of the inner surface 11 is the strongest, and the heating amplitude is the largest at this position, and the amount of heat generated is the largest. In order to protect the cavity 10 of the mold 1 and prevent the cavity from being damaged due to overhigh temperature, the shim plate 3 can be arranged between the inner surface 11 and the electromagnetic coil 8, the shim plate 3 can effectively insulate heat, and the phenomenon that the inner surface 11 is overhigh temperature and the shim plate 3 does not have magnetic permeability is avoided, so that the electromagnetic induction phenomenon of the electromagnetic coil 8 cannot be influenced.

The shape, size, material and the like of the backing plate 3 can be determined according to actual conditions and actual requirements in the actual application process.

In addition to the above-described embodiments, it is preferable that the first cooling duct 4 is provided in the mold 1, and the first cooling duct 4 is used to cool the region of the mold 1 other than the surface to be heated 9.

It should be noted that the first cooling duct 4 may be arranged around the other region of the mold 1 except the surface 9 to be heated, and as shown in fig. 2, the cooling medium may be vertically flowed into the first cooling duct 4 through the input duct, and the cooling medium may be flowed through the annular first cooling duct 4 to sufficiently cool the other region, and finally vertically flowed out from the output duct. Of course, the specific shape, structure, size, position, material and the like of the first cooling duct 4 may be determined during the actual operation according to the actual situation and the actual requirements.

It should be noted that, no matter the mold 1 is in the heating stage or the cooling stage, the cooling medium continuously flows in the first cooling duct 4, so as to keep the temperature of other molding areas of the mold 1 in the normal temperature range, even in a lower temperature range, which can effectively reduce the cooling time of the mold 1 in the cooling stage, thereby shortening the production cycle of the mold 1.

Preferably, a second cooling pipeline 5 for cooling the surface to be heated 9 is arranged in the mold 1, and the control device is connected with a switch valve of the second cooling pipeline 5 to control the flow of the cooling medium in the second cooling pipeline 5.

It should be noted that, when the mold 1 is in the heating state, the control device may control the switch valve of the second cooling pipeline 5 to be closed, so as to prevent the cooling medium from flowing into the second cooling pipeline 5, and when the mold 1 is in the cooling stage, the control device may control the switch valve of the second cooling pipeline 5 to be opened, so as to facilitate the cooling medium to flow into the second cooling pipeline 5, and the process that the cooling medium flows along the second cooling pipeline 5 may rapidly cool the surface to be heated 9, that is, may rapidly cool the local heating area of the mold 1, so that the mold 1 is rapidly cooled to the conventional temperature, and then the purpose of cooling the part 2 is achieved.

The specific shape, structure, size, position, material and the like of the second cooling pipe 5 can be determined according to actual conditions and actual requirements in the actual application process.

Preferably, the second cooling ducts 5 are arranged around the surface to be heated 9, and each second cooling duct 5 is arranged close to the surface to be heated 9. Moreover, the second cooling ducts 5 can be uniformly arranged along the region of the surface to be heated 9, as shown in fig. 2, the arrows in the figure are the flowing direction of the cooling medium, so that the cooling efficiency of the second cooling ducts 5 on the surface to be heated 9 can be effectively improved, and the cooling time of the surface to be heated 9 can be effectively shortened.

In addition to the above embodiments, it is preferable that a temperature sensor 6 for detecting the temperature of the mold 1 is provided in the mold 1, and the temperature sensor 6 is connected to the control device.

It should be noted that, the temperature sensor 6 is arranged in the mold 1, and the specific temperature of the mold 1 can be monitored in real time, so that after the control device receives the temperature signal of the temperature sensor 6, the control device can control the heating operation of the electromagnetic coil 8 according to the real-time temperature of the mold 1, and the control device can determine whether to perform the cooling operation and the injection molding operation according to the temperature of the mold 1.

The model, the setting position and the like of the temperature sensor 6 can be determined according to actual conditions and actual requirements in the actual application process.

Preferably, the temperature sensor 6 is arranged between the surface to be heated 9 and the chamber 10. This is because the magnetic conductor 7 is provided on the magnetic coil 8, so that the magnetic coil 8 heats intensively towards one side of the surface to be heated 9, and the region between the surface to be heated 9 and the chamber 10 is the main heating region, so that the temperature sensor 6 is provided between the surface to be heated 9 and the chamber 10, and the temperature of the mold 1 at the heating stage can be measured more accurately and rapidly.

Preferably, the mold 1 is provided with a plurality of cavities 10 and a to-be-heated surface 9 arranged corresponding to the cavities 10, each cavity 10 is internally provided with an electromagnetic coil 8, the control device comprises a plurality of controllers, and the controllers are connected with the electromagnetic coils 8 in a one-to-one correspondence manner. Therefore, by the arrangement, the heating operation of a plurality of surfaces to be heated 9 can be realized, and the power of each controller is adjusted to adjust the heating intensity of each electromagnetic coil 8, so that each surface to be heated 9 can reach different temperature requirements.

In order to further explain the usage of the rapid heating device for mold provided by the present invention, the following examples are provided.

First, the simulation software can be used to analyze the defect position of the part 2, which is the position of the surface defect with weld line, jet mark, thin wall, impression, etc., i.e., the above-mentioned surface to be heated 9. Then, the whole molding cycle of the part 2 is calculated by using simulation software, and the heating time and the cooling time are defined, because the cooling time and the cycle of different plastic parts 2 are different, the molding cycle of the part 2 needs to be calculated in advance. Finally, a corresponding temperature control system is designed at the defect position of the part 2, namely the shape and the arrangement of the electromagnetic coil 8, the position of the temperature sensor 6, the arrangement of the first cooling pipeline 4 and the second cooling pipeline 5 and the like are determined. Make the non-defective region of mould 1 keep conventional mould 1 temperature through setting up first cooling duct 4, set up cavity 10 in the defective region that is close to mould 1 to install solenoid 8 in cavity 10, set up magnetizer 7 in solenoid 8, and set up the second cooling channel in the position that is close to the defective region, thereby realize the regional quick heating of local of mould 1 and refrigerated dynamic temperature control, with promotion part 2 quality.

Additionally, the utility model provides a mould rapid heating device's work flow does:

1. after the injection molding of the part 2 is completed and before the next injection molding cycle begins, the actually needed heating time of the part 2 is analyzed and calculated by using simulation software, a control device gives a signal to enable an electromagnetic coil 8 to start to execute heating operation, and the temperature of the mold 1 can be monitored in real time by a temperature sensor 6 installed in the mold 1 so as to monitor the heating process of the mold 1;

2. when the mold 1 reaches the preset heating temperature, the control device can control the electromagnetic coil 8 to stop working and control the injection molding machine to perform operations such as injection molding, pressure maintaining and the like on the mold 1;

3. when the mold 1 enters the product cooling stage, the control device can control the cooling medium of the second cooling pipeline 5 to flow in, so that the second cooling pipeline 5 performs the cooling operation on the surface to be heated 9, and the temperature sensor 6 can monitor the cooling process in real time;

4. when the mold 1 reaches the preset cooling temperature, the control device can control the second cooling pipeline 5 not to flow in the cooling medium any more, namely stop the cooling operation of the surface to be heated 9, and can control the injection molding machine to perform the actions of mold opening, ejection and the like so as to take out the part 2 and then perform the next injection molding cycle operation.

Still need explain, the utility model provides a mould rapid heating device carries out rapid heating and cooling operation to the local little space of mould 1, can realize the local dynamic temperature control of mould 1, effectively improves 2 quality problems of part, and the energy consumption of this device is low, can not increase 2 production cycle of part yet, can reduce 2 production cycle of part even. In addition, the device does not need to increase extra parts and space to realize the moving operation of the electromagnetic coil 8, and the electromagnetic coil 8 of the device can be heated in the die opening and die closing states of the die 1, so that the production operation process of the part 2 can be effectively simplified.

It should be noted that the first cooling duct 4 and the second cooling duct 5 are mentioned in the present application, wherein the first and the second are only for distinguishing the position difference and are not in sequence.

It should be noted that the directions and positional relationships indicated by the "top" and "inner" in the present application are based on the directions and positional relationships shown in the drawings, and are only for the convenience of simplifying the description and facilitating the understanding, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction and operate, and thus should not be construed as limiting the present invention.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The utility model provides an arbitrary compound mode of all embodiments all is in this utility model's a protection scope, does not do here and gives unnecessary details.

It is right above that the utility model provides a mould rapid heating device introduces in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (9)

1. A rapid heating device for a mold, comprising: the injection molding device comprises a mold (1) with magnetic permeability, an electromagnetic coil (8) arranged in a cavity (10) of the mold (1) and a control device for controlling the electromagnetic coil (8) to be electrified or not, wherein the top of the mold (1) is provided with a surface to be heated (9) for containing injection molding liquid so as to facilitate molding of a part (2), and the electromagnetic coil (8) is connected with the control device.

2. The rapid heating device for the mold according to claim 1, wherein the electromagnetic coil (8) is disposed corresponding to the surface to be heated (9), and the electromagnetic coil (8) is wound on a magnetizer (7), and the magnetizer (7) is of a T-shaped structure, so that the electromagnetic coil (8) heats one side close to the surface to be heated (9) in a concentrated manner.

3. The rapid heating device of the mould according to claim 2, characterized in that a shim plate (3) is interposed between the inner surface (11) of the chamber (10) and the electromagnetic coil (8), the shim plate (3) being thermally but magnetically non-conductive.

4. The rapid heating device for the mold according to any one of claims 1 to 3, characterized in that a first cooling duct (4) is provided in the mold (1), and the first cooling duct (4) is used for cooling the region of the mold (1) except the surface to be heated (9).

5. The rapid heating device for the mold according to claim 4, characterized in that a second cooling pipeline (5) for cooling the surface to be heated (9) is arranged in the mold (1), and the control device is connected with an on-off valve of the second cooling pipeline (5) to control the flow of the cooling medium in the second cooling pipeline (5).

6. The rapid mold heating device according to claim 5, characterized in that the second cooling ducts (5) are arranged around the surface to be heated (9), and each of the second cooling ducts (5) is arranged near the surface to be heated (9).

7. The rapid heating device for the mold according to any one of claims 1 to 3, characterized in that a temperature sensor (6) for detecting the temperature of the mold (1) is arranged in the mold (1), and the temperature sensor (6) is connected with the control device.

8. The rapid heating device of the mold according to claim 7, characterized in that the temperature sensor (6) is provided between the surface to be heated (9) and the cavity (10).

9. The rapid heating device for the mold according to any one of claims 1 to 3, wherein the mold (1) is provided with a plurality of cavities (10) and the surface to be heated (9) arranged corresponding to the cavities (10), each cavity (10) is provided with the electromagnetic coil (8), and the control device comprises a plurality of controllers which are connected with the electromagnetic coils (8) in a one-to-one correspondence manner.

Images