JPH0621705Y2 - Mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a molding die, particularly a secondary bonding molding die for heat-bonding a vulcanized rubber and a component (metal resin or the like).

(Prior Art) Conventionally, as such a molding die, there is a molding die 100 as shown in FIG. The molding die 100 has the following configuration. That is, the molding die 100 includes the upper die 101 and the lower die 102. The upper mold 101 has a convex portion 101a at the center.
Have. Further, the lower mold 102 has a two-stage recess 102a and recess 102b. Here, the step difference between the recess 102b and the recess 102a is represented by A.

On the other hand, the molded product is a component 103 arranged in the recess 102b.
And a rubber 104 disposed above the component 103, and a component 105 further disposed on the rubber 104.
The thickness of the rubber 104 disposed between the component 103 and the component 105 is h, and the total thickness of the molded product including the component 103, the rubber 104, and the component 105 is represented as H. When the product is placed in the recess 102b of the lower mold 102, the surface of the recess 102a projects by x from the bottom surface of the recess 102a. That is, in such a mold, A + x
Is equal to the thickness H of the molded product before molding.

The molded product thus configured is pressed by the upper mold 101 to move the mold 101 downward by x, and the component 103, the rubber 10
4, the component 105 is adhered to each other.

(Problems to be Solved by the Invention) However, the above-described conventional molding die 100 has the following problems.

That is, since the A dimension of the molding die 100 is fixed, excess or deficiency of the bonding pressure occurs depending on the dimensions of the parts. For example, when unevenness is formed on the upper and lower surfaces of the component 103 and the component 105, excess or deficiency of the adhesive pressure occurs depending on the location, and the rubber 104 is cured or the outer peripheral portion at the location of the excess pressure. When the pressure is insufficient, the parts 103 and 105 and the rubber 104
There is a problem that a sufficient adhesive force with can not be obtained.

In addition, when a large number of pieces are taken, a difference in bonding pressure occurs even during the same molding due to variations in component dimensions.

Since it is necessary to improve the accuracy of the parts as described above, there is a problem that the cost of the parts is increased.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to obtain a stable adhesive force even if there are variations in component sizes, and to produce a product with the same molding even in the case of multiple production. The object of the present invention is to provide a downsized molding die that does not cause a difference in quality (adhesive strength).

(Means for Solving the Problems) In the present invention having the above object, a bottom part and an upper part attached to the bottom part and having an inner part consisting of an upper part and a central part, the inner diameter of the upper part is smaller than the inner diameter of the central part. A first mold having a step portion formed by a second mold, a second mold having a concave portion on the bottom portion side in sliding contact with the central portion of the first mold, and a concave portion of the second mold and the bottom portion. A spring which is interposed between the springs and urges the second mold upward,
The cavity is formed between the second mold and the upper portion of the first mold, and includes a rubber and a third mold for pressing a component bonded to the rubber.

(Operation) Thus, according to the present invention, the bottom part is attached to the upper part of the bottom part, and the inside is composed of the upper part and the central part, and the inner diameter of the upper part is smaller than the inner diameter of the central part. A first die having a step portion, a second die having a concave portion on the bottom portion side that is in sliding contact with the central portion of the first die, and a second die portion interposed between the concave portion and the bottom portion. A spring for urging the second mold upward, and a rubber and a component bonded to the rubber are pushed into a cavity formed between the second mold and an upper portion of the first mold. And the type of.

According to the forming die having such a configuration, the third die is opened, and the component and the rubber are inserted into the first die and the second die.

After that, the third mold is closed and placed in a heating facility, and the third mold is put into the second mold.
Make a close contact with the mold and the first mold.

At this time, if a spring having a spring constant to which a desired load is applied is incorporated, an appropriate adhesive force pressure can be obtained.

Further, if the spring constant of the spring is set to be small and the amount of deflection is set to be large, there will be no problem even if the dimensions of the parts vary.

In this way, the pressure required for bonding was obtained by the spring incorporated in the mold. Then, a stable adhesive force can be obtained even if there are variations in component dimensions due to the spring constant and the amount of deflection of the spring.

Further, since one spring is set for one product, even if a plurality of products are taken, there is no difference in product quality (adhesive strength) with the same molding.

Further, in the molding die and equipment, it is sufficient that the clamping force, and the proof strength of the die against it, are such that they can be incorporated into the die and exceed the spring load, so that the molding die can be downsized and the equipment can be simplified.

(Embodiment) Hereinafter, the present invention will be described based on an illustrated embodiment. First
Referring to the drawing, a mold 1 according to the present invention is arranged. The molding die 1 has a first die 2 having an annular shape and a hollow interior.

The first mold 2 is attached above the bottom part 3, and the inside thereof is composed of an upper part 2a and a central part 2b, and the inner diameter of the upper part 2a is
It is designed to be smaller than the inner diameter of the central portion 2b,
That is, a step is formed.

On the other hand, a second die 4 adapted to slide in the first die 2 in the axial direction is arranged on the inner peripheral portion of the first die 2. The sliding of the second die 4 is performed by sliding contact between the side surface 4a of the second die 4 and the central portion 2b of the first die 2.

A recess 5 is provided on the bottom 3 side of the second mold 4. The recess 5 has a substantially cylindrical cross section,
The depth is about half the thickness of the second mold 4.

Next, the spring 6 is fitted in the recess 5 of the second mold 4. The spring 6 is preferably a coil spring, and one end of the spring 6 is fixed to the concave portion 5 of the second mold 4 and the other end is fixed to the bottom portion 3 arranged below the first mold 2. The mold 4 is always urged upward.

Further, a third die 7 is arranged above the first die 2 and the second die 4 that slides in the first die 2 in the axial direction. The lower surface 7a of the third die 7 and the upper surface 2c of the second die 4 are in contact with each other.

Here, the molded product is composed of the following. The molded product is composed of a flat plate vulcanized rubber 8 and a component 9 made of metal or resin and arranged so as to sandwich both sides of the rubber 8. The heat-bonding of these vulcanized rubber 8 and the parts 9 (metal, resin, etc.) arranged so as to sandwich both sides of the rubber 8 is called secondary bonding. This secondary bonding is intended to be bonded. Good adhesion cannot be obtained unless a certain amount of pressure is applied to the rubber 8 surface and the component adhesive application surface.

Next, the operation of the molding die configured as described above will be described in detail.

First, the third mold 7 is opened. When the third mold 7 is opened, a cavity is formed between the second mold 4 and the upper surface of the first mold 2. The component 8 and the rubber 9 are alternately stacked and inserted into the cavity.

Next, the third mold 7 is closed, and the mold is clamped until the lower surface 7a of the third mold 7 and the upper surface 2c of the second mold 4 come into contact with each other, and then placed in a heating facility and heated.

At this time, if a spring 6 having a spring constant that applies a desired contact pressure is incorporated below the third mold 7, an appropriate adhesive force can be obtained.

Further, if the spring constant of the spring 6 is set small and the amount of deflection is set large, there is no problem even if the dimensions of the parts are varied.

Next, one mold 1 has been explained so far,
In the case of a mold 1 for multi-cavity production, 1 for each product part
Set the two springs.

Therefore, there is no difference in product quality (adhesion) with the same molding.

Here, the spring load is about 30 kg max per frame.

(Effects of the Invention) The mold of the present invention is attached to the bottom and above the bottom, and the inside is composed of the upper part and the central part, and the inner diameter of the upper part is smaller than the inner diameter of the central part. A first mold contact having a step, a second mold slidingly contacting the inside of the central part of the first mold and having a recess on the bottom side, and an interposition between the recess of the second mold and the bottom. A spring for urging the second mold upward and a rubber and a component bonded to the rubber are pushed into a cavity formed between the second mold and an upper portion of the first mold. 3 molds, and the spring incorporated in the molding mold 1 can obtain the pressure required for bonding, so that a stable bonding force can be achieved even if there are variations in component dimensions by setting the appropriate spring constant and deflection amount. Can be obtained.

Further, since one spring is set for each product, the same molding does not cause a difference in product quality (adhesive strength) even in the case of multiple production.

Further, in the molding die / equipment, it is sufficient that the clamping force and the proof stress of the molding die against it exceed the spring load incorporated in the die, so that the molding die miniaturization facility can be simplified.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a mold according to the present invention, and FIG. 2 is a vertical sectional view of a conventional mold. DESCRIPTION OF SYMBOLS 1 ... Molding mold, 2 ... First mold, 3 ... Bottom part, 4 ... Second mold, 5 ... Recess, 6 ... Spring, 7 ... Third mold, 8 ... Rubber 9 ……parts

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 9:00 4F

Claims (1)

[Scope of utility model registration request] 1. A first part having a bottom part and a step part which is attached above the bottom part and which is composed of an upper part and a central part, the inner diameter of the upper part being smaller than the inner diameter of the central part. A die, a second die that is in sliding contact with the center of the first die and has a recess on the bottom side, and a second die that is interposed between the recess and the bottom of the second die It comprises a biasing spring and a third mold for pressing the rubber and the component bonded to the rubber into the cavity formed between the second mold and the upper part of the first mold. Mold to be.