JP2002331545A - Insert molding method and die device for insert molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die device for an insert molding and an insert molding method capable of performing structurally simple and certain molding utilizing the insert mounted in a cavity by inspecting the quality of molding by measuring the force applied to the insert. SOLUTION: In integrally molding the insert 30 mounted in a molded product cavity 15 and a resin material M, the pressure of the resin material M in the cavity is detected by measuring the force applied to the insert 30 at the time of injection of the resin material M to perform molding. The quality of molding is judged based on whether the force applied to the insert 30 is within a predetermined range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to injection molding,
In particular, the present invention relates to a method for integrally molding by inserting an insert into a mold and a molding apparatus for the molding.

[0002]

2. Description of the Related Art For example, in molding an electric appliance part or the like, it is often the case that a metal member is inserted and mounted as an insert in a mold in advance to integrally mold a molded product. In this case, when the molded product is a small molded product and the resin molded part is smaller than the metal member to be inserted, the resin pressure in the cavity becomes insufficient and air voids may be generated inside the molded product. is there. Also, in the case of so-called multi-cavity molding having a plurality of cavities in a single mold, molding defects may occur in some cavities. Such air voids inside the molded article cannot be seen from the outside, but cause the insufficient strength of the molded article, so that they become serious defects in important functional parts.

[0003] In order to inspect such a molding defect, it is conceivable to measure the weight of a molded product. However, this method is not effective for an insert having a variable weight such as a metal member.

On the other hand, it has been practiced to determine the quality of a molded product by measuring the resin pressure. In this case,
Generally, a pressure receiving pin (a so-called dummy pin) for measuring a resin pressure is often arranged in a resin material flowing part, for example, a sprue or a runner, to measure the resin pressure. It is not possible to inspect the molding state in each cavity of a mold having a plurality of cavities. It is also conceivable to provide dummy pins directly in the cavity.However, not only does the mold structure become complicated, but there are cases where dummy pins cannot be provided in the cavity depending on the size and shape of the cavity or the properties of the molded product. is there.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention
In view of the above, it is necessary to inspect the molding quality by measuring the force applied to the insert using the insert mounted in the cavity, thereby performing simple and reliable molding in terms of structure. And a mold apparatus for insert molding.

[0006]

That is, according to the first aspect of the present invention, when an insert mounted in a molded product cavity and a resin material are integrally formed, a force applied to the insert when the resin material is injected. And performing molding by detecting cavity resin pressure.

According to a second aspect of the present invention, when integrally molding the insert and the resin material mounted in the molded product cavity, the length of the insert in the mold clamping axis direction is within a predetermined allowable range. That is, the present invention relates to an insert molding method characterized in that the force applied to the insert when the mold is closed is measured and detected.

[0008] The invention of claim 3 relates to the insert molding method according to claim 1 or 2, wherein the quality of molding is determined based on whether or not the force applied to the insert is within a predetermined range.

Further, according to a fourth aspect of the present invention, there is provided an insert sliding holding portion for slidably mounting and holding an insert with respect to a cavity, and a detection for measuring a force applied to the insert in the sliding direction. And a mold device for insert molding.

According to a fifth aspect of the present invention, there is provided an insert molding metal according to the fourth aspect, wherein a single mold has a plurality of cavities, and each of the cavities is provided with the insert sliding holding portion and the detecting portion. It relates to a mold device.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a partial sectional view of a main part of an insert molding die according to an embodiment of the present invention.

FIG. 1 shows a main part of an insert molding die 10 according to an embodiment of the present invention.
12 is a fixed mounting plate, 13 is a movable die, 14 is a movable mounting plate, 15 is a molded product cavity, 16 is a gate, 17 is a runner, 18 is a sprue, 19 is a sprue bush, 20 is an ejector, and 21 is an ejector plate. , 22 is an ejector plate mounting plate, 23 is its mounting bolt, 24 is a protruding pin, and 25 is a protruding hole. The illustrated mold 10
Is a so-called multi-cavity mold device having a plurality of cavities 15 (not shown).

Reference numeral 30 denotes an insert made of the above-described metal member or the like, which here comprises a main body 31 and a pin leg 32. Reference numeral 40 denotes an insert sliding holding portion provided on the movable die 13 for slidingly holding the main body portion 31 of the insert 30, and 41 denotes a fixed die 11 for holding the pin leg portion 32 of the insert 30. This is the pin holding hole provided.

Further, reference numeral 50 denotes a detecting portion for detecting a force applied to the insert 30, a pressure receiving pin 51 contacting the insert 30, and a pressure detector 52 such as a load cell for detecting the force applied to the pressure receiving pin 51. Consists of Here, the pressure receiving pin 51 also serves as a protruding pin of the molded product after molding as can be seen from the drawing. Reference numeral 53 denotes a pressure receiving portion of the pressure detector 52, reference numeral 54 denotes a spring, reference numeral 55 denotes a lead wire of the pressure detector 52. The pressure value detected by the pressure detector 52 is converted into an electric signal, and various indicators or control devices (not shown) are provided. Is transmitted to

First, according to the first aspect of the present invention, when the insert 30 mounted in the molded product cavity 15 and the resin material M are integrally formed, the force applied to the insert 30 when the resin material M is injected is described. The molding is performed by measuring and detecting the cavity resin pressure.

That is, as shown in the figure, after the insert 30 is mounted on the molded product cavity 15 and the mold is closed, the resin material M
Is injected, the insert 30 held by the insert sliding holding portion 40 is pressed against the pressure receiving pin 51 by the injection pressure of the resin material M. This pressing force is applied to a pressure detector 52.
To detect the cavity resin pressure. As for the insert 30 having a variation in length, it is preferable to provide a gap C in an allowable range between the insert 30 and the pressure receiving pin 51 as illustrated.

As defined in the third aspect of the present invention, the force applied to the insert 30, in other words, the pressure detector 52
If the pressure detected by the pressure receiving portion 53 is within a predetermined range, it is possible to confirm that an appropriate cavity resin pressure has been applied to the molded product, and that the non-defective product without air voids has been molded. On the other hand, if the force applied to the insert 30, that is, the pressure detected by the pressure detector 52 is equal to or less than a predetermined range, a sufficient cavity resin pressure is not applied, and the probability of generating air voids is high.
It is considered defective. Thereby, the quality of the molding can be determined.

Further, according to the invention of claim 2, when the insert 30 mounted in the molded product cavity 15 and the resin material M are integrally formed, the length of the insert 30 in the mold clamping axis direction is a predetermined allowable value. It is characterized in that it is within the range by measuring the force applied to the insert 30 when the mold is closed.

That is, as described above, the insert 3
0 indicates that the length of the insert 30 in the direction of the mold clamping axis is within a predetermined allowable range, but the force applied to the insert 30 when the mold is closed is measured. Can be detected. As in the illustrated embodiment, the main body 31 on one side of the insert 30 is
And the mold is closed, the pin leg 32 on the other side of the insert 30 is inserted into the pin holding hole 41 of the fixed mold 11 and abuts. At this time, if the length of the insert 30 in the mold clamping axis direction is within a predetermined allowable range, that is, within the gap C,
The insert 30 does not press the pressure receiving pin 51. On the other hand, if the length of the insert 30 in the mold clamping axis direction exceeds a predetermined allowable range, that is, exceeds the gap C, the pressure receiving pin 51 is pressed by closing the mold, and the pressure of the pressure detector 52 increases. You can know that.

Therefore, as defined in the third aspect of the present invention, the force applied to the insert 30, that is, the pressure (mold closing force) detected by the pressure receiving portion 53 of the pressure detector 52 is within a predetermined range (that is, the mold closing force). Here, if it is 0 (zero)), the length of the insert 30 in the direction of the mold clamping axis is a non-defective product within a predetermined allowable range, and conversely, the force applied to the insert 30, in other words, detected by the pressure detector 52. If the applied pressure (mold closing force) is out of the predetermined range (that is, a positive numerical value here), it is understood that the length of the insert 30 in the mold clamping axis direction is a defective product outside the predetermined allowable range, Thereby, the quality of the molding can be determined.

As will be understood from the above,
According to the method of the present invention, there is provided an insert sliding holding portion 40 for slidably mounting and holding the insert 30 with respect to the cavity 15, which is defined as the invention of claim 4, in the sliding direction with respect to the insert 30. This can be realized by the insert molding die apparatus 10 having the detection unit 50 for measuring the applied force.

The apparatus of the present invention has a plurality of cavities 15 in a single mold, as defined in the fifth aspect of the present invention. In the unit provided with the detection unit 50, the molding state of each cavity can be determined, so that it functions effectively and usefully.

[0023]

As shown and described above, according to the present invention, the quality of the molding is inspected by measuring the force applied to the insert using the insert mounted in the cavity, and In addition, simple and reliable molding can be performed.

Further, according to the present invention, when a dummy pin or a pressure sensor cannot be provided in the cavity, it is extremely effective and useful, and the insert holding portion is used. It is easy to remodel the mold.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a main part of an insert molding die according to an embodiment of the present invention.

DESCRIPTION OF SYMBOLS 10 Insert molding die apparatus 11 Fixed mold 13 Movable mold 15 Mold cavity 30 Insert 31 Main body part 32 Pin leg 40 Insert sliding holding part 41 Pin holding hole 50 Detecting part 51 Pressure receiving pin 52 Pressure detection vessel

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F206 AD03 AH33 AP034 JA07 JB12 JQ81

Claims (5)

[Claims] When molding an insert mounted in a molded product cavity and a resin material integrally, a force applied to the insert at the time of injecting the resin material is measured to detect a cavity resin pressure and to perform molding. Performing an insert molding method. 2. The method according to claim 1, wherein when the insert and the resin material mounted in the cavity of the molded article are integrally molded, the length of the insert in the mold clamping axis direction is within a predetermined allowable range. An insert molding method comprising measuring and detecting a force applied to the insert when the insert is closed. 3. The insert molding method according to claim 1, wherein the quality of the molding is determined based on whether a force applied to the insert is within a predetermined range. 4. An insert sliding holder for slidably mounting an insert in a cavity, and a detector for measuring a force applied to the insert in the sliding direction. Mold equipment for insert molding. 5. The insert molding die apparatus according to claim 4, wherein a single die has a plurality of cavities, and each of the cavities is provided with the insert sliding holding portion and the detecting portion.