CN111002548A

CN111002548A - Injection molding machine and injection molding method

Info

Publication number: CN111002548A
Application number: CN201911354597.9A
Authority: CN
Inventors: 马景
Original assignee: Shanghai Chuanggong Telecom Technology Co Ltd
Current assignee: Shanghai Chuanggong Telecom Technology Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-14

Abstract

The embodiment of the invention relates to the technical field of electronic equipment, and discloses an injection molding machine and an injection molding method. In the present invention, an injection molding machine includes: the mould is surrounded to form a cavity, and a jig is positioned on the outer side of the mould and used for heating the mould. The invention also provides an injection molding method. The injection molding machine and the injection molding method provided by the invention have the advantages that the form removal maintenance is not needed, the maintenance convenience is improved, and the production efficiency is improved.

Description

Injection molding machine and injection molding method

Technical Field

The embodiment of the invention relates to the technical field of electronic equipment, in particular to an injection molding machine and an injection molding method.

Background

The injection molding machine has a working principle similar to that of an injection syringe for injection, and is a technological process of injecting plasticized plastic in a molten state into a closed cavity by means of the thrust of a screw, heating and cooling to realize solidification and shaping of the plastic in the molten state, and then obtaining a product. In the prior art, a cavity is generally heated by an electromagnetic wire inside a mold, then molten plastic is injected into the closed cavity, and then the plastic is cooled to ensure the quality of a plastic product.

The inventor finds that at least the following problems exist in the prior art: when the electromagnetic wire for heating in the mold is damaged, the mold needs to be removed for maintenance, the maintenance is inconvenient, and the production of the injection molding machine must be stopped at the same time, so that the production efficiency is influenced.

Disclosure of Invention

An object of an embodiment of the present invention is to provide an injection molding machine and an injection molding method, which do not require removal of a mold for maintenance, improve convenience of maintenance, and improve production efficiency.

To solve the above technical problem, an embodiment of the present invention provides an injection molding machine including: the mould is surrounded to form a cavity, and a jig is positioned on the outer side of the mould and used for heating the mould.

Embodiments of the present invention also provide a method of injection molding, comprising: providing an injection molding machine, wherein the injection molding machine comprises: the jig is positioned on one side of the mold, which is far away from the cavity, and is used for heating the mold, and the jig and the mold are detachably arranged; moving the jig to a preset position to heat the cavity; controlling the jig to be heated to a preset temperature, stopping heating, and removing the jig; injecting the raw material to be molded into the cavity; and after cooling, taking out the molded product in the cavity.

Compared with the prior art, the embodiment of the invention has the advantages that the injection molding machine further comprises a jig which is positioned outside the mold and used for heating the mold, namely the jig is additionally arranged to heat the mold, so that when the electromagnetic wire for heating is damaged and the jig can not be heated normally, the production of the injection molding machine can be continued only by replacing one jig without disassembling and maintaining the mold, the maintenance convenience is improved, meanwhile, the production of the injection molding machine is not required to be stopped, and the production efficiency is improved.

In addition, the tool includes the tool body, and is located this internal and electromagnetic wire that is used for generating heat of tool.

In addition, the jig body and the die are arranged at intervals.

In addition, the tool body is including encircleing the lateral wall that the mould set up, the magnet wire is including being the spiral encircleing the first magnet wire that the lateral wall set up.

In addition, the tool body still including connecting the diapire of lateral wall, the magnet wire is including being the spiral setting and being in the second magnet wire in the diapire, arbitrary two points on the second magnet wire all equals with the shortest distance of diapire.

In addition, the electromagnetic wire is arranged in the jig body in an S shape.

In addition, the shortest distances from any two points on the electromagnetic wire to the die are equal. According to the arrangement, the distances from any two points on the electromagnetic wire to the die are equal, so that the plastic raw materials at all positions in the cavity are uniformly heated, and the quality of plastic products is improved.

In addition, the tool body includes inner shell and shell, the inner shell is close to shell one side and/or the shell is close to on the inner shell one side, be provided with and be used for holding the recess of magnet wire.

In addition, the jig body is made of an insulating material. So set up, avoided the tool body because of the vortex that the electromagnetic wire produced and the problem that generates heat, improved injection moulding machine's heating efficiency and security.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

Fig. 1 is a perspective view of an injection molding machine according to a first embodiment of the present invention;

fig. 2 is a front view of an injection molding machine according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a jig according to a first embodiment of the present invention;

fig. 4 is a flowchart of an injection molding method according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

A first embodiment of the present invention relates to an injection molding machine 100, as shown in fig. 1, 2, and 3, including: the die comprises a die 11 for forming a cavity and a jig 12 which is positioned outside the die 11 and used for heating the die 11.

Specifically, the jig 12 includes a jig body 121 and an electromagnetic wire 122 located in the jig body 121 and used for generating heat, and further, the jig body 121 and the mold 11 are arranged at an interval, so that a distance between the electromagnetic wire 122 in the jig body 121 and the mold 11 is in a range of 5 cm to 25 cm, thereby ensuring eddy current generated by the electromagnetic wire 122 and enabling the mold 11 to have a better heating effect.

Preferably, the shortest distances from any two points on the electromagnetic wire 122 to the mold 11 are equal, and in this way, the distances from any two points on the electromagnetic wire 122 to the mold 11 are equal, so that the plastic raw materials at all positions in the cavity are uniformly heated, and the quality of the plastic product is improved.

In this embodiment, the jig body 121 is a rectangular parallelepiped, and the electromagnetic wire 122 is disposed in the jig body 121 in an S-shape.

It can be understood that the jig body 121 may also include a sidewall disposed around the mold 11 and a bottom wall connected to the sidewall, where the sidewall may be cylindrical, and the bottom wall may be disc-shaped, the magnet wire 122 includes a first magnet wire 122 (similar to a spring) disposed spirally around the sidewall and a second magnet wire 122 (similar to a pie) disposed spirally in the bottom wall, and the shortest distance between any two points on the second magnet wire 122 and the bottom wall is equal.

It should be noted that the jig body 121 may also be configured in other shapes, and when the jig body 121 is the same as or similar to the mold 11 and can be configured to surround the mold 11, a better heating effect can be ensured.

Of course, the arrangement of the electromagnetic wires 122 may also be a plurality of concentric circles, a plurality of sleeved squares, waves, bowls, etc., which is not limited herein.

Specifically speaking, the jig body 121 comprises an inner shell and an outer shell, wherein the inner shell is close to one side of the outer shell and/or the outer shell is close to one side of the inner shell, and a groove for accommodating the electromagnetic wire 122 is formed in the outer shell, so that the electromagnetic wire 122 can be conveniently assembled, disassembled and maintained.

In the present embodiment, the jig main body 121 is made of an insulating material, such as a plastic material, so as to avoid the problem that the jig main body 121 generates heat due to the eddy current generated by the electromagnetic wire 122, and improve the heating efficiency and the safety of the injection molding machine 100. Preferably, the jig body 121 is made of phenolic plastic, so that the jig body 121 has high mechanical strength, good insulation property, heat resistance and corrosion resistance.

In practical applications, the injection molding machine 100 may further include a temperature control box 13, the temperature control box 13 is electrically connected to the electromagnetic wire 122 and a temperature sensor, the temperature sensor is configured to detect a temperature in the cavity, and the temperature control box 13 is configured to disconnect a current of the electromagnetic wire 122 to stop heating after the temperature in the cavity reaches a preset temperature, where the preset temperature may be set as required, for example, 200 ℃. Of course, the temperature control box 13 may also be configured to stop heating by cutting off the current of the electromagnetic wire 122 after maintaining the preset temperature for a certain time, which is not limited herein.

It should be noted that the injection molding machine 100 may further include a manipulator for moving the jig 12, the heating line is routed along the original line of the manipulator, one end of the heating line is connected to the jig 12, the other end of the heating line is connected to the temperature control box 13, and the temperature control box 13 is connected to the socket of the injection molding machine.

Optionally, the injection molding machine 100 may further include a cooling device 14, where the cooling device 14 includes a pipe for containing chilled water, and the chilled water in the pipe can accelerate cooling of the material to be molded in the cavity.

The temperature control box 13 and the cooling device 14 are both connected to an industrial power supply, the temperature control box 13 is connected to the magnet wire 122 via a first lead 15, and a high-frequency current flows through the first lead 15, so that the magnet wire 122 can generate an eddy current.

Compared with the prior art, the embodiment of the invention has the advantages that the injection molding machine 100 further comprises the jig 12 which is positioned outside the mold 11 and used for heating the mold 11, namely the jig 12 is additionally arranged to heat the mold 11, so that when the electromagnetic wire 122 for heating is damaged and the jig 12 cannot be normally heated, the production of the injection molding machine 100 can be continued only by replacing one jig 12 without disassembling and maintaining the mold, the convenience of maintenance is improved, meanwhile, the production of the injection molding machine 100 is not required to be stopped, and the production efficiency is improved; in addition, because the mold 11 and the jig 12 are not an integral structure, the mold 11 and the jig 12 are arranged at intervals or detachably, and the production process of the injection molding machine 100 comprises a heating stage and a cooling stage, and is not required to be heated all the time, when the jig 12 corresponding to a certain mold 11 is damaged, the jig 12 in the injection molding machine 100 at other cooling stages can be used for heating, and the jig 12 is shared by heating gaps of other injection molding machines 100, so that a spare jig 12 and corresponding temperature control equipment are not required to be additionally equipped, and the equipment cost is reduced; in addition, because the dies 11 of the same type can share the jig 12, when some dies 11 are maintained, the jig 12 can heat other dies 11 to produce products, and each die 11 is not required to be provided with one heating jig 12 and corresponding temperature control equipment, so that the cost is further reduced.

A second embodiment of the present invention relates to an injection molding method, as shown in fig. 4, including:

s21: an injection molding machine is provided.

Wherein the injection molding machine 100 includes: the mold 11 for forming the cavity is defined, and the jig 12 is located on one side of the mold 11, which is far away from the cavity, and is used for heating the mold 11, wherein the jig 12 and the mold 11 are detachably arranged, and the specific details are similar to those in the first embodiment, and are not repeated here.

S22: and moving the jig to a preset position to heat the cavity.

In this step, the jig 12 is fixed to a robot arm, and the robot arm moves the jig 12 to a preset position, where the preset position is an area within a range of 115 cm to 25 cm from the mold.

Optionally, because the dies 11 of the same model can share the jig 12, when some dies 11 are maintained, the jig 12 can heat other dies 11 to produce a product, and it is not necessary for each die 11 to be configured with a heating jig 12 and a corresponding temperature control device, that is, the jig 12 can heat different dies 11 at different times, and the jig 12 is configured outside the die 11 in a time-sharing and circulating manner by a manipulator, so that the cost can be further reduced.

S23: and after controlling the jig to be heated to a preset temperature, stopping heating, and removing the jig.

In this step, after control by temperature control box 13 control tool 12 heated the die cavity to preset temperature, the stop heating compares in not heating directly with the molten state wait to shape the raw materials and mould plastics to the die cavity, through heating the die cavity to preset temperature, can improve plastic product highlight, thin wall, weld line, stress mark scheduling problem, improves the product quality, and wherein, the die cavity generally is 90 ~ 100 degrees centigrade, and preset temperature can set up to 200 ~ 180 degrees centigrade.

In practical application, if the fixture 12 is damaged and cannot be normally heated in the heating process, the production of the injection molding machine 100 can be continued by replacing one fixture 12 without disassembling the mold for maintenance, and the replaced fixture 12 can be the fixture 12 in the other injection molding machine 100 in the cooling stage without additionally providing a spare fixture 12 and corresponding temperature control equipment, so that the equipment cost is reduced.

S24: and injecting the raw material to be molded into the cavity, cooling and taking out the molded product in the cavity.

In this step, after the jig 12 is removed by the manipulator, the cavity is closed, the molten raw material to be molded is injected into the heated cavity, after cooling, the cavity is opened, the molded product in the cavity is taken out, and the injection molding process of the next product is started.

Wherein, the cooling process specifically includes: and (4) closing the mold, carrying out injection molding and pressure maintaining, gradually and naturally cooling the mold 11, and then continuously cooling the mold by cooling water in a cooling device 14.

The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. An injection molding machine, comprising: the mould is surrounded to form a cavity, and a jig is positioned on the outer side of the mould and used for heating the mould.

2. The injection molding machine of claim 1, wherein the jig comprises a jig body and an electromagnetic wire for generating heat inside the jig body.

3. The injection molding machine of claim 2, wherein the jig body is spaced apart from the mold.

4. The injection molding machine of claim 2, wherein the jig body includes a sidewall disposed around the mold, and the magnet wire includes a first magnet wire spirally disposed around the sidewall.

5. The injection molding machine of claim 4, wherein the jig body further comprises a bottom wall connected with the side wall, the magnet wire comprises a second magnet wire spirally arranged in the bottom wall, and the shortest distance between any two points on the second magnet wire and the bottom wall is equal.

6. The injection molding machine of claim 2, wherein the magnet wire is disposed in the jig body in an S-shape.

7. The injection molding machine of claim 2, wherein the shortest distances from any two points on the electromagnetic line to the mold are equal.

8. The injection molding machine of claim 2, wherein the jig body comprises an inner shell and an outer shell, and a groove for accommodating the magnet wire is arranged on one side of the inner shell close to the outer shell and/or one side of the outer shell close to the inner shell.

9. The injection molding machine of claim 2, wherein the jig body is an insulating material.

10. A method of injection molding, comprising:

providing an injection molding machine, wherein the injection molding machine comprises: the jig is positioned on one side of the mold, which is far away from the cavity, and is used for heating the mold, and the jig and the mold are detachably arranged;

moving the jig to a preset position to heat the cavity;

controlling the jig to be heated to a preset temperature, stopping heating, and removing the jig;

injecting the raw material to be molded into the cavity;

and after cooling, taking out the molded product in the cavity.