JPS62127130A - Die with abnormity detector - Google Patents

Abstract

PURPOSE:To stabilize quality of product by equipping a strain gauge detecting the strain to a press die the time of at forming to perform a discrimination of abnormity. CONSTITUTION:A magnetic detecting device is installed by fixing its both ends to the press die 1. On the detecting device 3, a magnetic wire 3a wherein a magnetic scale is given and a memory is stored magnetically is used. Furthermore, a magnetic detecting head 3c is equipped at a position opposite to the magnetic wire 3a to read the magnetic scale stored on the magnetic wire 3a. In this mechanism, when the press forming is performed, a pressure strain and a thermal strain are generated in the press die 1, the magnetic wire 3a is expanded and contracted along with a wire spring 3b. In this case, the abnormity of the die 1 is detected by the strain, and the propagation speed of the strain detected by the detecting head 3c. In this way, the press is controlled to obtain the product with stable quality.

Description

[Detailed description of the invention] □Yu-L□-S■■■■i□□□ The present invention relates to a mold with an abnormality detector.

Thank you! All press molds, that is, dies that are molded under pressure Y7JO, tend to cause distortion during molding.

There is a risk that the mold may become distorted when cutting with a cutting mold, squeezing with a squeeze mold, pouring with a die-cast mold, and molding with a press mold with a plastic mold during injection molding.

The problem that the invention aims to solve: Is this kind of distortion within an acceptable range? Is there an abnormality during press molding when it exceeds 9? As a result, it will no longer be possible to stably produce ytH goods.

problem? [Means to solve the problem] What are the advantages of this method? In consideration of this, in the present invention, a detector for detecting abnormal strain Z during press molding is provided in the press mold, and the detection can be used to identify abnormalities.
For example, the ejector may have an air output scale γ,
It is possible to make a product 7 which is extremely stable in detecting changes in the scale. A magnetic wire with a magnetic scale that has been magnetically memorized is stretched over a part of the friend press die, and the air outlet detection head is placed opposite the magnetic wire, so that the magnetic wire expands and contracts in response to the distortion of the press die. - Any distortion that exceeds a certain state as read by the air detection head is treated as an abnormality. In addition, a temperature sensor is installed, and the prediction is made in advance to determine the relationship with the thermophilic strain.

Pressure due to thermal expansion χ stosine gauge. Something that is detected and determined using a differential transformer, torque sensor, etc.

Displacement and distortion of press mold? Strain gauges etc. can be used to detect
Even if these detected values are not yet in a dangerous state, the degree of danger can be determined based on the relationship between changes and time.

In this way, in the present invention, by detecting abnormal strain during press molding, it is possible to cool down, slow down the operating speed, or improve the machine speed. It is possible to take measures such as stopping and removing the cause, making it possible to produce extremely stable products.

Fix it now An embodiment of the present invention shown in FIG. 1 will be described.

Figures 1 and 2 are front views of the Ruth plate showing the state before edge forming on the part to be formed, for example, a part of the connecting rod. It is. Reference numeral 5 denotes a magnetic detection device, which is fixedly attached at both ends to a part of the press plate 1.

The magnetic detection device 5 uses a magnetic wire 5a provided with a magnetic scale and on which memory is magnetically recorded.

The magnetic scale is applied to the magnetic wire 5a as already proposed by the present applicant in Japanese Patent Application Laid-open No. 58-21+604, by sequentially irradiating the magnetic wire 5a with a particle beam such as a laser beam at predetermined intervals. Then, a partial heat treatment was performed to form a partial pattern with hunting characteristics different from that of the surrounding area, which was used as a scale. A magnetic detection head 5c is provided opposite the magnetic wire 5a to read the magnetic scale of the magnetic wire. The magnetic material of the magnetic detection head 5C is PtC! o system* Fe-cr-co system.

Any magnet such as ferrite type or 0uNiF'e type can be used, and the support material is made of a material with a small coefficient of thermal expansion.

Quartz glass, PtCo-based materials, invar, etc. can be used directly or in combination with magnetic materials. Further, although it does not have to be a 5b+1 spring wire, it can be stretched in series with the magnetic wire 5a and fixed at both ends χ to the press plate 1, so that it can smoothly expand and contract with respect to strain along with the wire 5a.

In FIG. 2, the magnetic wire 5a of the detector [5 and the spring 5]
With b? It is fixed to the outside of the press plate 1 and installed in the bottle 4゜4.
The bin 4.4 can be fixed at any position and the detector 5 can be installed.

Next, the operation of the present invention will be explained. Pressure strain and thermal strain are generated in the press plate 1 during molding in the press die, so the wire 5a provided in a part of the press plate 1 and capable of coming out stretches together with the spring wire 5b. This is read on a magnetic scale, detected by a magnetic detection head, and also read on a display (not shown).If the amount of strain exceeds a certain level or the speed at which the strain progresses, the press mold χ is cooled. By taking measures such as slowing down the operating speed, or stopping the machine and removing the cause, it is possible to create extremely stable products.

= Is the detection device part of the press type plate in the present invention as shown in Figure 1 for one arm or more? By providing a certain amount of distortion that occurs during molding? It is possible to create extremely stable products by determining and dealing with over-strain and the strain rate in the relationship between time and strain.

It includes all press molds (back-cutting molds, molding molds, grain O-types, die-casting molds, casting molds, forging molds, glass molds, plastic molds, etc.), that is, dies that are formed by applying pressure to 710 degrees. Examples of devices that can be used include, in addition to the magnetic detector, commercially available strain gauges, differential transformers, torque sensors, thermometers, etc.

[Brief explanation of drawings]

The first factor is the front view of the press plate according to the embodiment of the present invention, and the second factor is
The figure shows another embodiment. In the legs, 1 is a press plate, 2 is a molded part, and 5 is a magnetic detection part t.
58 is a magnetic wire, and 5b is a spring wire. 5C is the detection head.

Claims (7)

[Claims] (1) A mold with an abnormality detector, in which a press mold is provided with a detector for detecting distortion during molding, and the detector detects distortion and determines abnormalities. (2) Claim 1 in which the detector has a magnetic scale
Mold with abnormality detector as described in section. (3) A mold with an abnormality detector according to claim 1, wherein the detector is a magnetic wire having a magnetic scale and a magnetic detection head. (4) A mold with an abnormality detector according to claim 1, wherein the detector detects thermal strain. (5) A mold with an abnormality detector according to claim 1, wherein the detector detects pressure strain. (6) A mold with an abnormality detector according to claim 1, wherein the detector is a strain gauge. (7) A mold with an abnormality detector according to claim 1, wherein what is determined is a strain rate determined based on the relationship between time and strain.