JPS63107522A - Mold equipment - Google Patents

Abstract

PURPOSE:To contrive unification of a mold product by detecting the wear of a plunger or a pot in an early stage, by providing a detecting device of a sliding action of a plunger on each of the plungers. CONSTITUTION:A seat 12 and detecting pin 13 moving unitarily with a plunger 6 through an action of a spring 11 are held into a hole 14 in the lower part of plungers 6 and a light emitting appliance 16 and light receiving appliance 17 are arranged in the direction crossing at right angles with a sliding direction of the detecting pin 13. In the case where sleeve resistance between a pot 4a and plunger 6a is great, the plunger 6a is hard to ascend inspite of an ascent of a transfer cylinder 9. Therefore, a spring 11a starts to contract earlier as compared with the spring 11 in the lower part of the plunger 6 operating normally and light through a light emitting appliance 16a is interrupted by a detecting pin 13a before the lapse of (t) hours after starting of the transfer cylinder 9. Therefore, whether resin is cast into a cavity 7 normally can be judged by only detecting timing where light through the light emitting appliance 16 is shaded by a detecting pin 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to molding technology, and particularly to a technology that is effective when applied to multi-plunger molding technology.

[Conventional technology]

The temperature of a so-called multi-plunger mold device having a plurality of plungers is described in Japanese Patent Laid-Open No. 59-201429. The outline will be explained using FIGS. 3 and 4. Reference numeral 1 denotes a lower mold, in which a pair of left and right cavities 3A are arranged in one direction on its main parting surface, and pots 4 for inserting resin tablets are provided in each of the two cavities 3. . Incidentally, a plunger 6 is disposed inside each of the ducts 4. Reference numeral 2 designates an upper mold, and a cavity portion 3B is formed on the parting surface of the upper mold, corresponding to the cavity portion 3A of the lower mold 1. Reference numeral 5 denotes a gate, through which the resin press-fitted in the pot 4 is injected into the space constituted by the °C cavities 3A and 3B. In addition, 7
is resin.

[Problem that the invention seeks to solve]

Incidentally, in the case of such a multi-plunger type molding device, in order to manufacture a molded product of uniform quality, it is necessary to inject the resin 7 into each cavity 3A, 3B almost simultaneously.

However, since the degree of wear of each plunger or pot is different, differences occur in sleeve resistance (resistance when the plunger slides inside the pot). In other words, when the resin 7 enters between the pot 4 and the head of the plunger 60, the friction becomes extremely large and the plunger 6
There was a problem in that the resin 7 did not slide smoothly and the transfer of the resin 7 to the cavities 3A and 3B was delayed, resulting in mold defects such as insufficient mold and voids.

An object of the present invention is to provide a technique that can reduce mold defects.

An object of the present invention is to provide a technique that can detect the sliding movement of each plunger.

The above and other objects and novel features of the present invention are:
It will become clear from the description of this specification and the accompanying drawings.

[Means for solving problems]

A brief overview of typical inventions disclosed in this application is as follows.

That is, each plunger is provided with means for detecting the sliding movement of the plunger.

[Effect]

According to the above-mentioned means, abnormalities in the sliding movement of the busy plunger can be detected, so maintenance such as replacing the plunger or pot can be carried out in a timely manner.
This can reduce mold defects such as voids and mold shortages.

〔Example〕

FIG. 1 is a schematic configuration diagram of a molding device which is an embodiment of the present invention, and FIG. 2 is an enlarged view of the main parts of the present invention. A detailed explanation will be given below according to the drawings. Components that are the same as those described in FIGS. 3 and 4 are designated by the same reference numerals, and their explanations will be omitted.

Each plunger 6 is supported by one plunger holder 8, and is reciprocated within the pot 4 by vertical movement of a transfer cylinder 9. Reference numeral 10 designates a backing plate, and a seat 12 that moves together with the plunger 6 by the action of a spring 11 and a detection pin 13 connected to the dust 12 are housed in a hole 14 below the plunger 6, respectively. Reference numeral 15 denotes a detector holder that holds a means for detecting the sliding movement of the detection pin 13. For example, the light emitter 1
6 and a light receiver 17 are provided.

In addition, 18 is a stopper for regulating the maximum stroke length of the plunger 6, and 19 is a slide shaft for moving the backing plate 10 up and down parallel to the lower mold IK.

Next (the operation will be explained in detail). First, a tablet (not shown) molded with resin powder is put into each bot 4. After that, the press cylinder, which was at the lower limit position, is operated at high speed in the initial stage. , the upper limit position, that is, the lower gold is 1
The upper mold 2 is moved at low speed and raised before it comes into contact with the upper mold 2, and both molds are clamped with a predetermined pressure. Synchronizing with the completion of mold clamping, the nitrogen transfer cylinder 9 is moved upward from the lower limit position. Note that when the transfer cylinder 9 is at the lower limit position, the spring 11 at the bottom of each plunger 6
Although it is slightly compressed due to the weight valve of the seat 12 and detection pin 13,
Each detection pin 13 is set at a position where it does not block the source from the light emitter 16. Also, the top edge of the tablet is the upper mold 2.
In a normal mold, unless a downward force is applied to the plunger 6, the transformer 7 and the cylinder 9 will rise, and the plunger 6 will move up with the same width as the transfer cylinder 9.
Since both the detection pin 13 and the detection pin 13 rise, the positional relationship between the light emitting and light receivers 15 and 16 and the detection pin 13 remains unchanged, and the light generated from the light emitter 16 is not blocked by the detection pin 13 and is transmitted to the light receiver 17. do.

When the transfer cylinder 9 is raised until the tablet comes into contact with the upper mold 2, a downward force is applied to the plunger 6, and the spring 11 begins to contract. Then, when the spring 11 is compressed by a predetermined amount, the detection pin 13 is adjusted to block the light from the light emitter 15. In addition, in order to keep the time (1) from starting the transfer cylinder 9 until each detection pin 13 blocks light constant, the spring constant length of each spring 11 and the length of the detection bin are made to be the same. .

However, when the sleeve resistance between the pot and the plunger is large (in this embodiment, it is 4a).

In the plunger 6a), the plunger 6a does not rise or does not rise easily even though the transfer cylinder 9 rises, so the spring lla shrinks faster than the spring 11 at the bottom of the plunger 11 which is operating normally. Initially, the light from the light emitter 16a is blocked by the detection pin 13a before one hour has passed since the transfer cylinder 9 was started.

Therefore, by simply detecting the timing at which the light from the light emitter 16 is blocked by the detection bottle 17, it is possible to determine whether resin is normally injected into the cavity 7 for each plunger.

Next, the functions and effects of this embodiment will be explained.

(1) By measuring the sliding movement of each of multiple plungers, it is possible to measure the magnitude of the sleeve resistance of each plunger, so wear of the plunger or pot can be detected at an early stage, and appropriate maintenance timing can be determined. This has the effect of making it easier to understand.

(2) Since the molding operation can be performed under stable conditions due to (1), the quality of the molded product can be made uniform.

(31(1) makes it possible to detect wear of the plunger or pot at an early stage and replace it at an early stage, which has the effect of reducing mold shortages and internal voids in molded products.

(4) By detecting the movement of each plunger or a member that moves integrally with the vertical movement of each plunger by the transmission or interruption of light between the emitter and receiver, each plunger can be easily and compactly configured. The effect is that the sliding state of the plunger can be recognized.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that the present invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor. For example, the present invention is not limited to detecting the movement of each plunger by transmitting or blocking light (for example, the vertical movement of the plunger may be detected magnetically).

In the above explanation, the invention made by the present inventor is mainly applied to a multi-plunger molding device for semiconductor devices, which is the background field of application. The present invention can also be applied to a molding device.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

That is, since it is possible to detect the magnitude of the °C sleeve resistance for each plunger, it is possible to detect wear of the plunger or pot at an early stage, and to achieve the effect that the molded product can be made uniform.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a molding device that is an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the molding device shown in Fig. 1, and Figs. 3 and 4 are explanatory diagrams of a conventional molding device. . 1...Lower mold, 2...Upper mold, 3...Cavity, 4...Pot, 5...Gate, 6...Plunger, 7...Resin, 8... Plunger holder, 9.
...Transfer cylinder, 10...Backing plate, 11...Spring, 12...Seat, 13...Detection pin, 14...Hole, 15...Detector holder, 1
6... Emitter, 17... Light receiver, 18... Stopper, 19... Slide shaft. ,−゛・. Agent: Patent Attorney Katsuo Ogawa (°: Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1. A large number of cavities formed by the parting surfaces of both upper and lower molds, a plurality of cylindrical pots formed in the lower mold, and a plurality of plungers provided corresponding to the pots. A molding device comprising: a mechanism for measuring the sliding motion of each of the plungers. 2. The mechanism for measuring the sliding motion of the plunger includes a light emitting device disposed at a predetermined position and a light emitting device placed at a predetermined position so as to block or transmit light by the action of the vertical movement of the plunger itself or a member that moves integrally with the plunger. The molding device according to claim 1, comprising a light receiving device.