JP3915041B2 - Electric heating element for injection molding tools - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a heating element gold genus made circumference pipe in the form of a tube heating element, the heating conductor in the peripheral surface tract is disposed embedded in an insulating material, the peripheral surface tube, manually It is related with the electric heating member for injection molding tools which consists of a material which can deform plastically by applying force.
[0002]
[Prior art]
The formation of the corresponding type and style of the peripheral tube allows the heating element or heating magazine formed thereby to be manually plastically deformable in the respective direction, so that the heating element or heating magazine is It can easily be adapted to the local situation by corresponding manual bending. Therefore, there is no need for mechanical pre-bending of the peripheral tube, and the bending can be performed manually in the field according to the situation.
[0003]
It is normal to use such heating elements for casting tools, in particular for the heating plate of heating passage tools, in which case the corresponding tool or tool part is insert-molded with an electric heating element. It has a contour that can.
[0004]
According to the prior art (German Patent No. 4242505), an electric heating element for injection molding tools is also known, in which the peripheral tube is formed by a flexible ring corrugated hose. Thereby, it is ensured that the heating element or the heating magazine is flexible in the respective directions and can be adapted to local conditions by bending as well.
[0005]
In order to guarantee the normal function of such a heating member, it is necessary to pack an insulating material such as MgO in a powder form into a ring corrugated hose and compress it by vibration or the like.
[0006]
It has been found that the compression of this material has to be relatively complicated.
[0007]
In the case of using an electric heating member as described in the superordinate concept in a conventional normal contour of a casting tool, it is necessary to adjust the diameter of the peripheral pipe to the existing contour. Since these contours are relatively large in terms of diameter or inner diameter, the peripheral tube must be configured to have a correspondingly large diameter. On the other hand, however, this impedes the ability to bend manually, so that a new profile with a smaller dimension in cross-section is made into a corresponding tool, and thus a thinner circumference that can be bent manually with force at this time. It is necessary for the user to be able to use a heating member with a face tube, or the user must continue with the conventional configuration of the heating member that does not allow manual deformation capability. Finally, however, the user can also use a heating element with a circumferential tube made of a ring corrugated hose, in which case the insulating material cannot be compressed correspondingly anyway, so that Based on the reduced shrinkage capability of a simple ring corrugated hose, the desired output cannot be delivered.
[0008]
[Problems to be solved by the invention]
Given this prior art, the object of the present invention is to allow easy manual bending ability of the heating member when the outer diameter of the heating member is relatively large, and in that case, the heating member further increases the An object of the present invention is to provide an electric heating member as described at the beginning which can transmit a heating output.
[0009]
[Means for Solving the Problems]
In order to solve this problem, the present invention proposes the following. That is, on the peripheral surface tube, ring-shaped or al旋波shaped hose has been covered, the space between the hose and the peripheral surface tube is filled with a metal powder which can satisfactorily transfer heat.
[0010]
This configuration also facilitates the manufacture of the heating member. This is because the heating element inside can be manufactured as usual by a material that can be plastically deformed by applying pressure manually, and the compression of the insulating material therein is also performed normally by contraction of the peripheral tube Because it can. At this time, a ring corrugated hose or a spiral corrugated hose can be easily put on the peripheral pipe, and the metal powder can be packed. In this case, the metal powder can be compressed by an arbitrary method. For example, it can be performed by vibration. In this way, a heating member configured for a large output is provided. In this case, a larger diameter of the total heating member is created by an additionally provided ring corrugated hose, etc. It can also be inserted into the conventional contour of a tool or tool plate. At that time, although the diameter of the heating member is relatively large, the manual bending ability of the heating member is maintained as a whole. In order to ensure outward heat transfer, metal powder capable of heat transfer is provided in the hollow space of the pipe between the peripheral pipe and the ring or spiral corrugated hose.
[0011]
An advantageous configuration is as follows. That is, the metal powder is compressed by radial press or hose shrinkage.
[0012]
In order to still improve the heat transfer capacity in this way, a large compression of the metal powder is achieved, in which case the bending capacity of the overall heating element is never hampered thereby.
[0013]
Furthermore, it is advantageous to consider the following. That is, the maximum outer diameter of the heating member is matched with the inner width of the heating member receiving groove of the tool, and the diameter of the peripheral tube is smaller than that, and corresponds to about half the diameter of the heating member as much as possible, or about the diameter It is still smaller than that.
[0014]
In addition, it is advantageous for the end of the peripheral tube to be covered by a cap, which forms an opposing support for the end of the hose.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the invention are shown in the drawings and are described in detail below.
[0016]
The electric heating element for the injection molding tool is shown in the form of a tube heating element 1. This has a metal peripheral tube 2 made of a material that can be manually plastically deformed, preferably nickel. A heating conductor 3 is arranged, for example, in a spiral shape in the circumferential tube, and this heating conductor is embedded in an insulating material 4, for example MgO. Since the entire tube heating member 1 is compressed by the diameter contraction, a large output can be transmitted. An electric terminal pin 5 is connected to the heating conductor 3, and this electric terminal pin leads to the outside.
[0017]
A ring- shaped or spiral corrugated hose 6 made of metal, particularly high-grade steel, is covered on the peripheral pipe 2. The space between the hose 6 and the peripheral pipe 2 is filled with a metal powder 7 that can transfer heat well, and this metal powder is compressed. Ceramic closure cap is provided at the 8, the closure cap is held has been placed over the end of the tube the heating member 1, and by screwing, and in the closure cap, the ring-shaped or al An end portion of the spiral wave hose 6 is supported.
[0018]
The metal powder 7 is compressed by radial pressing or shrinkage of the diameter of the hose 6.
[0019]
Since the maximum outer diameter of the heating member thus formed is adjusted to the inner width of a conventional receiving groove such as a tool plate, the heating member thus configured is a conventional normal heating member. Instead, it can be inserted into the corresponding receiving groove and can be matched. The diameter of the peripheral pipe 2 is smaller than the maximum diameter of the spiral corrugated hose or the ring corrugated hose 6 and corresponds to about half of the diameter as much as possible, so that the entire heating member has a relatively large diameter. Manual bendability is guaranteed.
[0020]
The diameter of the circumferential tube can be approximately 4 to 5 mm. At this time, the ring or the spiral corrugated hose may have an outer diameter of 8 to 8.5 mm.
[0021]
The present invention is not limited to the embodiments and can be variously modified within the scope of the disclosure.
[0022]
Any new individual and combined features disclosed in the specification and / or drawings are considered important to the invention.
[Brief description of the drawings]
FIG. 1 is a side view showing, in partial cross section, an electric heating member according to the present invention.
[Explanation of symbols]
1 Pipe heating member 2 Circumferential pipe 6 Hose 7 Metal powder 8 Cap

Claims (4)

An electrical heating element for an injection molding tool, a heating member gold genus made circumference pipe in the form of a tube heating element, the heating conductor in the peripheral surface tube is disposed embedded in an insulating material and, the peripheral surface tube, in what consists manually by applying force plastically deformable material, on the peripheral surface tube (2), and overlaid ring-shaped or al旋波shaped hose (6) cage, the space between the hose (6) peripheral surface pipe (2), characterized in that it is filled with metal powder (7) which can satisfactorily transfer heat, for injection molding tools Electric heating element.   Electric heating element according to claim 1, characterized in that the metal powder (7) is compressed by radial pressing or shrinkage of the hose (6).   The maximum outer diameter of the heating member is matched to the inner width of the heating member receiving groove of the tool, and the diameter of the peripheral tube (2) corresponds to half of the maximum outer diameter of the heating member, or is still more in diameter. The electric heating member according to claim 1, wherein the electric heating member is small. The end of the circumferential tube (2) is covered by a cap (8), which cap supports the end of the hose (6). The electric heating member according to one.

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