JP3564217B2 - Injection molding machine mold plate - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mold plate of a mold clamping device of an injection molding machine.
[0002]
[Prior art]
An example of a conventional mold clamping device will be described with reference to FIGS. In FIG. 3, the mold clamping device includes a fixed mold plate 3 holding the fixed mold 1, a movable mold plate 4 holding the movable mold 2, and moving the movable mold plate 4 back and forth with respect to the fixed mold plate 3. After the movable mold opening / closing cylinder 5 and the movable mold platen 4 approach the fixed mold platen 3 to close the fixed mold 1 and the movable mold 2 with each other, the fixed mold platen 3 and the movable mold platen 2 are closed and fixed. It has a tie bar 6 for performing the operation and a mold clamping cylinder 7.
[0003]
The tie bar 6 is fixed to the fixed die plate 3. The fixed die plate 3 and the movable die plate 4 are fixedly connected to each other on the opposite side of the mold mounting surface of the movable die plate 4 in a direction substantially perpendicular to the tie bar 6. The half nut 8 is opened and closed, and FIG. 3 shows a state in which the half nut 8 is closed. Reference numeral 9 denotes an injection device for injecting the molten resin.
[0004]
The mold clamping device is initially in the mold open state, that is, the position where the half nut 8 is opened to disengage the tie bar 6, the mold opening / closing cylinder 5 is extended, and the movable mold plate 4 is moved away from the fixed mold plate 3 (FIG. Left).
[0005]
When the molding operation starts, first, the mold opening / closing cylinder 5 shrinks, the movable mold plate 4 approaches the fixed mold plate 3, and the movable mold 2 comes into contact with the fixed mold 1 to close the mold and stop. Then, the half nut 8 is closed and connected to the tie bar 6 (the state of FIG. 3). In the closed state of the mold, the phase is adjusted in advance by a mold thickness adjusting device (not shown) so that the engagement groove of the coupling portion between the half nut 8 and the tie bar 6 is engaged exactly.
[0006]
Next, a strong mold clamping force is applied by the mold clamping cylinder 7 to clamp the movable mold 2 and the fixed mold 1, and the injection device 9 is pressed against the fixed mold 1 to inject the resin. Thereafter, the resin is cooled, the mold clamping force of the mold clamping cylinder 7 is loosened, the half nut 8 is opened, and the movable mold platen 4 is opened to the first mold opening state by the mold opening / closing cylinder 5 to complete one molding operation.
[0007]
In this type of mold clamping device, the heavy-weight fixed-side mold and the movable-side mold are accurately aligned, and the fixed-side mold and the resin injection nozzle insertion port provided on the fixed mold board are also aligned with each other. Mounting on a fixed mold plate and a movable mold plate requires a great deal of labor and skill. To facilitate this work, it has been proposed to attach a mold mounting device to each of the fixed mold plate and the movable mold plate. ing.
[0008]
This mounting device will be described with reference to FIGS. FIG. 4 is a side view of the mounting device, and FIG. 5 is a sectional view taken along line VV of FIG. The tie bar 6 in FIG. 3 is not shown here.
[0009]
In these figures, reference numerals 10, 11, and 12 denote a mold guide receiving portion, a positioning pressing pin device, and an automatic clamping device provided on the fixed mold plate 3 and the movable mold plate 4 so as to face each other. The mold guide receiving portion 10 is formed by a guide surface 10a and a guide roller 10b disposed thereon. The positioning pin device 11 is formed by a pressing pin 11b advanced and retracted by an operating device 11a. It is formed of a fixed arm 12b which is turned or linearly moved by the operating device 12a.
[0010]
Reference numerals 13 and 14 denote support plates for supporting the fixed mold 1 and the movable mold 2, respectively. Reference numerals 15 and 16 denote upper and lower liners fixed to the upper and lower ends of the support plates 13 and 14, respectively. A positioning concave portion 16a into which the pressing pin 11b is fitted is provided at a predetermined position on the lower surface of the lower liner 16, and a hook receiving portion 16b for a pressing hook (not shown) is provided at an end in the longitudinal direction. Reference numerals 17 and 18 in FIG. 4 denote resin nozzle insertion ports of the fixed mold 1 and the fixed mold platen 3, respectively.
[0011]
When the fixed mold 1 and the movable mold 1 are mounted, the distance between the fixed mold plate 3 and the movable mold plate 4 is set substantially equal to the width of the molds 1 and 2. And 2 are inserted from the side. The insertion is performed by engaging the hook of the push / pull tool with the hook receiving portion 16b of the lower liner 16 and pressing the same. Both dies 1 and 2 are guided by the lower liner 16 on the guide rollers 10b of the die receiving portion 10. The guide roller 10b rolls to move smoothly.
[0012]
When the two dies 1 and 2 reach a predetermined position, the pressing pin 11b is fitted into the positioning recess 16a by the positioning pin device 11, and the fixing arm 12b fixes the upper liner 15 and the lower liner 16 by the automatic clamping device 12, respectively. .
[0013]
The upper liner 15 and the lower liner 16 are set to predetermined dimensions so that the relative positions of the two dies 1 and 2 and the two axes La and Lb of the resin nozzle insertion ports 17 and 18 automatically fit in the correct positions. It has become.
[0014]
[Problems to be solved by the invention]
Generally, the mold used for the injection molding machine is large in size and weight, and when it is mounted on the mold plate, it is hung by a hoist and performed in a narrow place surrounded by four tie bars. This is a difficult task, and it is easy to damage the mold mounting surface by colliding the mold with the mold plate, and it is costly and time consuming to repair the damage.
[0015]
In addition, the mold mounting surface of the mold board becomes rusted and the skin becomes rough, the mounting accuracy of the mold is reduced, and dirt is easily attached with rust, and there is a risk of contamination of the molded product. When plating a mold plate, there is a problem that it is costly because it is large and heavy.
[0016]
It is an object of the present invention to solve these problems and to provide a tool that can perform a mold mounting operation safely and easily and can maintain the entire apparatus including a mold mounting surface in a stable state. It is.
[0017]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned problem, and is a mold plate for holding a mold in a mold clamping device, the entire surface of a mold mounting surface excluding a part necessary for fixing or for clamping work. covered with liner, with the same liner sticking to the mold platen of the liner provided with a hole having a diameter head fasteners do not protrude to the surface at the same fastener, before Symbol fastener and molding removal ejector pin there is provided a mold platen of an injection molding machine having a diameter of the hole you through. That is, on the movable and fixed mold plates facing each other, to fix the liner, or a part necessary for performing the mold clamping operation, such as an insertion port of a resin injection nozzle, a hole for ejector pin penetration, or Almost the entire surface of the mold mounting surface except for the holes where the tie bars pass is covered with a liner, and the liner is provided with a hole with a diameter so that the head of the fixing tool does not protrude from the surface. The fixing tool is fixed to the mold plate, and a hole having a diameter through which the fixing tool and the ejector pin for removing the molded product penetrate is provided , so that the mold mounting surface is protected from damage and corrosion, and the mold mounting operation is safe. Can be done quickly.
[0018]
Further, the present invention provides a mold plate of an injection molding machine in which the liner is made of a steel material such as stainless steel or tool steel, and is not a special and special material but a universal material such as stainless steel or tool steel. By adopting, the desired hardness and corrosion resistance can be easily obtained.
[0019]
The present invention also provides a mold plate of an injection molding machine in which the surface of the liner has been subjected to a surface treatment for increasing hardness and corrosion resistance by ceramic coating or chrome plating, etc. The desired hardness and corrosion resistance can be easily obtained in the liner of this mold by a simple method such as ceramic coating or chromium plating, which are generally adopted methods.
[0020]
Still further, the present invention provides a mold plate of an injection molding machine in which the thickness of the liner is 1 to 10 mm. Since the liner has a thickness of at most 10 mm, the work of mounting the mold is surrounded by a tie bar. Even if the operation is performed in a narrow space, the worker does not feel particularly narrow and can proceed with the operation in a normal state to easily obtain a desired mold plate.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same components as those of the conventional device described with reference to FIGS. 3 to 5 are denoted by the same reference numerals in the drawings, and redundant description will be omitted.
[0022]
FIG. 1 is a perspective view of the mold plate, in which 3, 4, and 6 are fixed mold plates, a movable mold plate, and a tie bar, respectively, and 20 and 21 are attached to a fixed mold plate 3 and a movable mold plate 4, respectively. A fixed-type board liner and a movable-type board.
[0023]
The liners 20 and 21 for the fixed mold board and the movable mold board are substantially all over the mold mounting surfaces of the fixed mold board 3 and the movable mold board 4, respectively, except for necessary parts for fixing described later or for mold clamping work. The surface is formed of a smooth metal plate having a thickness of, for example, about 1 to 10 mm. It may be selected from special alloy tool steel or the like having improved corrosion resistance by adding Cr.
[0024]
Instead of using such a material, the surface of a normal steel material may be formed by applying various heat treatments or surface treatments such as ceramic coating or chromium plating to increase the hardness and corrosion resistance.
[0025]
The fixed mold plate 3 has an insertion opening for a resin injection nozzle at the center, the movable mold plate 4 has a through hole for ejector pins for removing molded resin, and both the fixed mold plate 3 and the movable mold plate 4 have a through hole. Since a large number of screw holes for attaching the mold are provided in the mold plate, holes having a larger diameter are provided in portions covering these holes and the screw holes.
[0026]
20a is a hole for a resin injection nozzle, 21a is a hole for an ejector pin, 20b and 21b are holes for a bolt, and 20c and 21c are notches for passing a tie bar.
[0027]
FIG. 2 shows the manner in which the two liners 20, 21 are attached to the fixed mold plate 3 and the movable mold plate 4. The fixed mold plate 3 and the movable mold plate 4 are provided with rust-preventive oil, and are fixed as shown in FIG. Using a flat head screw 22 so that the head of the screw does not protrude from the surface of the liner 20, 21.
[0028]
The mold mounting surfaces of the fixed mold board 3 and the movable mold board 4 are almost in the same state even when the liners 20 and 21 are attached, as in the case where there is no liner. On the other hand, hardness and corrosion resistance are improved by the liners 20 and 21.
[0029]
As described above, the present invention has been described with reference to the illustrated embodiments. However, the present invention is not limited to such embodiments, and it goes without saying that various changes may be made to the specific structure within the scope of the present invention. Absent.
[0030]
【The invention's effect】
As described above, according to the present invention, there is provided a liner that covers the entire surface of the mold mounting surface except for a portion necessary for fixing or for clamping work , and the liner has a diameter such that the head of the fixing tool does not protrude from the surface. The hole is provided and the liner is fixed to the mold plate with the fixing tool, and the mold plate is formed by providing a hole having a diameter through which the fixing tool and the ejector pin for removing the molded product penetrate . By improving the hardness and corrosion resistance of the mold mounting surface, damage to the mold mounting surface can be prevented, and rust can be prevented, so that the surface skin can always be kept in a good state.
If the liner is damaged, the liner can be easily replaced and the replacement operation does not require special care, so that the time and cost required for the replacement can be reduced.
[0031]
According to the second aspect of the present invention, the preferred liner may be made of popular stainless steel or tool steel as a material having high hardness and corrosion resistance, so that a desired liner can be obtained at low cost. In addition, since stainless steel has a low thermal conductivity, the heat insulating effect is also increased, the heat transfer from the mold to the mold plate is reduced, and the temperature of the mold is easily controlled.
[0032]
According to the third aspect of the present invention, a desired liner can be easily obtained by a general ceramic coating or chromium plating as a surface treatment for enhancing hardness and corrosion resistance . In addition, the mold mounting surface of the liner having been subjected to such a surface treatment can be kept clean at all times, and there is no risk of contamination of the molded product. Further, since the heat transfer coefficient of the ceramic coating is also small, the ceramic coating exerts a heat insulating effect on heat transfer from the mold. The surface treatment such as coating and plating does not directly treat a large and heavy mold plate, and does not require it, which also contributes to cost reduction.
[0033]
Furthermore, according to the invention of claim 4, since the thickness of the liner is 1 to 10 mm, that is, at most 10 mm, the work of attaching the mold is performed in a particularly narrow space. The mounting work can be carried out with a normal center, rather than a sufficient thickness, and a preferable die plate can be easily obtained as a final result.
[Brief description of the drawings]
FIG. 1 is a perspective view of a mold plate provided with a liner according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing how to attach a liner in FIG.
FIG. 3 is a horizontal sectional view of a conventional injection molding apparatus.
FIG. 4 is a side view of a conventional mold mounting apparatus.
FIG. 5 is a sectional view taken along line VV of FIG. 4;
[Explanation of symbols]
1,2 mold 3,4 mold board 20,21 liner

Claims (4)

A mold platen for holding the mold in a mold clamping device, for fixing or clamping covers the entire surface of the mold mounting surface except for on the necessary portions in the liner operations, the head of the fastener to the liner surface the diameter of the hole which does not project provided with sticking to the mold platen to the liner at the same fastener, before Symbol fastener and molding removal ejector pin, characterized in that a pore diameter you through injection Molding machine mold plate. The die plate of an injection molding machine according to claim 1, wherein the liner is made of a steel material such as stainless steel or tool steel. The die plate of an injection molding machine according to claim 1, wherein the surface of the liner is subjected to a surface treatment for increasing hardness and corrosion resistance by ceramic coating or chrome plating. 4. The mold plate of an injection molding machine according to claim 1, wherein said liner has a thickness of 1 to 10 mm.

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