JPS618314A - Injection molding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (A) Technical Field of the Invention The present invention relates to an injection molding apparatus, particularly an injection molding apparatus having a lower fixed mold, a movable mold that can be opened and closed in the left and right directions, and an upper fixed mold. This invention relates to an injection molding apparatus configured to drive the opening direction of the movable mold at a slow speed at the beginning of the opening direction and then shift to a rapid drive when injection molding a molded product made of a brittle material such as ceramic. .

(+3) Technical Background and Problems Conventionally, plastic injection molding apparatuses have a configuration as shown in FIG. That is, in FIG. 5, I
Fi injection molding device, 2 is a lower fixed type, 3A and 3B are movable types, 4 is an upper fixed type, 5 is a mold clamping part, 6 is an operating rod,
7 is a movable drive unit, 8 is a device base, 9 is a molding gap, 1
0 is a component injection hole, ] 1 is a movable mold support part, IIA is a dovetail that is installed on the bottom of the movable mold, IIB
Fi dovetail groove provided on the upper surface of the lower fixed mold, 12 a coupling bottle that mechanically connects the movable mold 3 and the movable drive part 7, 13 a rod sliding part. In the illustrated case, it is composed of a diagonal hole that loosely fits into the operating rod, 14 is a molded product removal device, 15 is a push-up bottle, 16 is a spring, and 17 is a push-up plywood board. The injection molding apparatus having the configuration shown in FIG. 5 is shown as one for molding a thin plate molded article 20t having the configuration as shown in FIG. That is, although FIG. 2(A) shows a front view of the molded product and FIG. 2(B) shows a side view of the molded product, the molding gap 9 corresponding to the shape of the molded product 2o is the fifth Lower fixed mold 2, movable molds 3A and 3B, and upper fixed mold 4 shown in the figure
It is composed of a shape surrounded by

As shown in the enlarged view of FIG. 5(B), the lower fixed mold 2 and the movable molds 3A and 3B are movable in the horizontal direction as shown in the figure by the dovetail IIA and the dovetail groove 11B. ,
combined. The side surfaces of the movable molds 3A and 3B are formed with slopes as clearly shown in FIG. is fixed to the upper fixed mold 4. That is, when the upper fixed mold 4 is pushed down while the movable molds 3A and 3B are in the closed state, the mold clamping portion 5 pushes the slope of the movable molds 3A and 3B, causing the movable molds 3A and 3B to 3B has a shape that is tightened in the horizontal direction.

The movable mold 3A (also 3B) having the above-mentioned dovetail IIA is connected to the movable mold drive part 7 by the coupling pin 12, and when the movable mold drive part 7 moves in the horizontal direction shown in the figure as described later, the movable mold 3A (3B) is made to move in the horizontal direction shown in the figure along the above-mentioned dovetail groove 11B. That is, when the movable mold 3A moves horizontally to the left in the figure, the movable molds 3A and 3B
For example, a molded article 20 (
The side surface of FIG. 2 and the movable mold 3A (3B) are now separated.

In the case shown in FIG. 5, the movable drive section 7 has a rod sliding section formed by an oblique hole into which the operating rod 6 is loosely fitted. In the illustrated case, the operating rod 6 is constituted by a linear rod that extends obliquely and fixed to the upper fixed mold 4. In this case, when the upper fixed mold 4 is pulled upward slightly, the clamping of the movable mold 3A (3B) by the mold clamping part 5 is released, and then the upper fixed mold 4 is further pulled up and the operating rod 6 is moved as shown in FIG. When moved upward by the distance shown, the operating rod 6 comes into contact with the rod sliding part 13, and accordingly, the movable drive part 7
is driven to the left in the figure, and the movable mold 3A (3B) is driven to the left in the figure.9 As shown in FIG. The mold 4 is lowered to clamp the movable molds 3A and 3B by the mold clamping part 5, and the upper fixed mold 4 is placed on the movable molds 3A and 3B so as to cover them. Under this condition, the molding material is injected into the molding gap 9 from the component injection hole 10, and molding is performed. After the molding is performed, when the upper fixed mold 4 is slightly pulled upward, the component injection hole 10 is opened.
The molded product is cut at the position (bottle neck position as shown in the enlarged view in FIG. 5(C)), the mold clamping part 5 escapes upward, and the clamping on the movable mold 3A (3B) is released. . However, in this state F, the surface of the molded product 20 molded in the cavity 9 shown in FIG.
Separation from the plane (3B) has not yet been performed. Next, when the upper fixed mold 4 is further pulled up, the operating rod 6 moves upward by the distance shown in FIG. 5 and comes into contact with the oblique hole in the rod sliding portion 13. And further upper fixed type 4
When the movable mold 3 is pulled up, the operating rod 6 drives the movable mold drive section 7 to the left in the figure, and moves the movable mold 3 as shown in the figure.
A is driven to the left. As a result, the surface of the molded article 20 being molded and the surface of the movable mold 3A (3B) are separated. When the push-up base plate 17 is pushed upward after the movable mold 3A (3B, ) is fully opened, the bottle I5 is pushed upward against the spring 16, and the bottle 15 is fixed at the bottom. The molded product 20 that has entered the mold 2 is extruded from below, and the molded product 20 is taken out.

The conventional injection molding apparatus is configured as described above, and when the molded product 20 is made of plastic, for example, no particular problem occurs. However, when attempting to mold a ceramic molded article using the injection molding apparatus, the molded article often gets damaged when trying to separate the movable mold 3A (3B) shown in FIG. do.

This is due to the fact that ceramic is much more brittle than glass. However, it has been confirmed that the above-mentioned damage does not occur if the operation by the operating rod 6 shown in FIG. 5 is removed and the movable fi 3A (3B) is opened by manual means.

(0) Object and Structure of the Invention The object of the present invention is to provide an injection molding apparatus that prevents the occurrence of the above-mentioned damage. 7 and improved,
When the operating rod 6 is pulled up, the movable type 3A (3B)
The opening speed is first set to a slow state, and the movable type 3A (
3B) is characterized in that it is configured to suppress the occurrence of an undesired vacuum state as much as possible when opening, and to eliminate damage to the ceramic molded product.

A detailed explanation will be given below with reference to the drawings.

(D) Embodiment of the Invention Fig. 1 shows the configuration of an embodiment of the invention, Fig. 2 shows an example of a molded product to be molded by the injection molding apparatus of the invention, and Fig. 3 shows the structure of an embodiment of the invention. FIG. 4, an explanatory diagram illustrating the moving state of the movable type, shows a modification of the operating rod used in the present invention.

In the case of the conventional configuration shown in FIG. 5, when the operating rod 6 is pulled up by the distance shown in FIG. Then, as shown by the curve 1 mA in FIG. 3, the movable mold 3A (3B) is suddenly opened horizontally in the form of a broken line.

For this reason, the surface of the movable mold 3A (3B) and the surface of the molding i20 are rapidly separated, and an undesired vacuum state is generated in the separated portion. Above ceramic composition
It was confirmed that the damage to the storehouse 20 was based on the occurrence of the vacuum state. From this, in the present invention, as shown in the curve B in FIG. 3, the movable type 3A (3B)
The separation speed when the surface is separated from the surface of the molded article 20 is made sufficiently low to prevent the generation of the vacuum state.

FIG. 1 shows the structure of an embodiment of the present invention, in which the numbers 1 to 17 #St in the figure correspond to the structure shown in FIG. 5. In the case of the embodiment shown in FIG. As (
1) A straight part 30 extending vertically from the upper fixed mold 4, and (
1) It has a slow resolution mold part 40 having a small inclination angle and (m) a rapid resolution mold part 50 having a large inclination angle. Furthermore, a pole sliding mechanism is provided as the rod sliding portion 13. The other parts are exactly the same as the configuration shown in Figure 5, and the state in which the molded product is molded can be considered to be the same. However, in the case of the configuration shown in Figure 1, the operating rod 6
As for the straight line section 30, the slow resolution mold section 40, and the rapid resolution mold section 5.
0. - From this, when the upper fixed mold 4 is being pulled up, the movable drive part 7 is first driven at a very slow speed to the left in the figure, and then at a rapid speed to the left in the figure. Correspondingly, the movable mold 3A (3B) is first separated from the surface of the molded article 20 at a very slow speed, and then rapidly opened. That is, air enters the separated part of the molded product 20 at the first slow speed, preventing the generation of the above-mentioned undesired vacuum state. ) is opened at high speed to prevent an increase in processing time for taking out the molded product.

FIG. 4 shows a modification of the operating rod, and the reference numerals 6, 30, 40, 50 in the figure correspond to those in FIG. In the case shown in FIG. 4, the linear portion 30, the slow-resolving mold portion 40, and the rapid-resolving mold portion 50 are in contact with each other at bending points. However, even if this is done, the curve B shown in FIG. 3 only has some inflection points, and virtually no particular problem arises on the side.

(IIC) As described in detail, according to the present invention, the occurrence of an undesired vacuum state can be suppressed, and even when molding a very fragile molded product such as a ceramic molded product, the molded product can be prevented from being damaged. This prevents it from being put away.

[Brief explanation of drawings]

Fig. 1 shows the configuration of an embodiment of the present invention, Fig. 2 shows an example of a molded product to be molded by the injection molding device of the present invention, and Fig. 3 explains the moving state of the movable mold by the injection molding device of the present invention. FIG. 4 shows a modification of the operating rod used in the present invention, and FIG. 5 shows an example of a conventional injection molding apparatus. In the figure, 1 is an injection molding device, zIIi lower fixed type, 3A. 3B is a movable mold, 4 is an upper fixed mold, 5 is a mold clamping part, 6 is an operating rod, 7 is a movable mold drive part, 8 is a device pace, 9 is a molding gap, 10 is a molding material injection hole, 11 is a movable mold Support part, ]2
1 is a connecting bottle, 13 is a rod sliding part, 20 is a molded product, 30
40 represents a straight-line portion, 40 represents a slow-resolution portion, and 50 represents a rapid-resolution portion. Patent applicant: Discharge Precision Machining Institute Co., Ltd. Patent attorney: Mori 1) Hiroshi (3 others) Sagi 2 Figure 31 sword

Claims (1)

[Claims] The lower fixed type, the movable type that can be opened and closed in the left and right directions relative to the lower fixed type, the upper fixed type that is provided to cover the top of the movable type, and the upper fixed type that supports downward movement. a mold clamping part that clamps the movable mold in the closing direction and releases the clamping of the movable mold in response to upward movement of the upper fixed mold; and a mold clamping part that releases the clamping of the movable mold by the mold clamping part. The method further includes at least a movable drive part that moves the movable mold in an opening direction under certain conditions, and injects a molding material into an internal space formed by the lower fixed mold, the movable mold, and the upper fixed mold. The injection molding apparatus for molding is provided with an operating rod that activates an opening direction operation by the movable mold drive unit in conjunction with the upward movement of the upper fixed mold, and the operating rod moves from the upper fixed mold to the opening direction. A linear part of a predetermined length extending substantially in the vertical direction, a slow solving mold part provided at the end of the straight part and extending at a relatively small inclination angle with respect to the vertical direction, and a slow solving mold part provided at the end of the slow solving mold part. and a quick release mold part extending at a relatively large inclination angle with respect to the vertical direction, and the movable drive part moves the operating rod in response to the upward movement of the operating rod in the vertical direction. An injection molding device characterized by comprising a rod sliding portion that moves the movable mold in the opening direction while sliding on a side surface.