JPH0442100Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a joining jig for a metal member and a rubber sheet, which is particularly suitable for joining a thin film rubber sheet and a metal member.

(Prior Art) Generally, in the manufacture of electromagnetic valves, there is a step of bonding and fixing a thin rubber sheet to the end face of a valve seat made of a metal member. To explain the conventional joining method in this process, along with its jig, first, when using instant adhesive, as shown in Figure 3, a thin rubber sheet is placed on the reference surface of surface plate 1. 2
(hereinafter referred to as a rubber sheet) and apply instant adhesive to the valve seat 3 for the solenoid valve made of a metal member. This is pressed onto the rubber sheet and joined by adhesive. After drying, The rubber sheet 2 is appropriately cut using a blank punching jig to obtain a product.

Separately, when bonding is performed using a vulcanizing adhesive, as shown in FIG.
and middle mold 5, and tighten both molds 4, 6 with bolts 6, 6.
5 is tightened and fixed, and the outer peripheral portion 2b of the rubber sheet 2 is held under pressure. Next, the solenoid valve seat 3 coated with vulcanized adhesive is placed on the center part 2a of the rubber sheet 2, and then the solenoid valve seat 3 is pressed down with the upper mold 8, and pressurized. This is a method of vulcanization bonding by heating.

Generally, if the rubber sheet 2 is not evenly adhered, the rubber sheet 2 will become slack or wrinkled, resulting in a defective product, so it is most important to make it adhere uniformly.

However, when using instant adhesive, if the instant adhesive is not applied uniformly and in a short time, a portion of the rubber sheet 2 may peel off from the solenoid valve seat 3 or the solenoid valve seat 3 may Since the position is not fixed, slippage occurs when pressing, resulting in joint misalignment. Alternatively, the overflowing adhesive may harden the rubber sheet 2, making it impossible to use it as a valve seat, and so on, resulting in various inconveniences.

On the other hand, when joining by vulcanization welding using a vulcanized adhesive, the outer peripheral part 2b of the rubber sheet 2 is pressed and held, but the tension in the central part 2a is
If there is insufficient pressure or heat, the material may become loose or wrinkled, or the material may not be fixed in position.
There were some inconveniences such as misalignment during pressurization.

(Problem to be solved by the invention) As mentioned above, when joining a metal member and a rubber sheet with an instant adhesive using a conventional jig, applying and pasting the adhesive can be done in an extremely short time. Since it is processed internally, it is difficult to maintain high uniformity over the entire surface of the bonded area, which may cause loosening, wrinkles, or
There is a disadvantage that defects such as partial peeling often occur. Furthermore, when a vulcanizing adhesive and a conventional jig are used, the tension in the center of the rubber sheet is not appropriate, and wrinkles and slack often occur when the rubber sheet is cooled after bonding.

The present invention was made to eliminate the above-mentioned disadvantages, and even if a metal part and a rubber sheet are bonded using a conventional instant adhesive or vulcanized adhesive,
It is an object of the present invention to provide a joining jig for joining a metal member and a rubber sheet that does not cause loosening, wrinkles, or partial peeling.

[Structure of the idea]

(Means for Solving the Problems) The present invention consists of a lower mold that supports a rubber sheet, a first intermediate mold that can be pressed into and separated from the lower mold and that holds the outer circumference of the rubber sheet under pressure, and a first intermediate mold that is integrated with or mounted on the lower mold. It consists of a removable second middle die, an annular groove provided on the lower die, and an annular protrusion provided on the second middle die, and the fit between the groove and the protrusion causes tension in the center of the rubber sheet. A jig for joining a metal member and a rubber sheet, comprising a tensioning means for applying tension, an upper mold for pressing the metal member placed in the central part and joining it to the rubber sheet, and a means for positioning and holding the metal member. It is.

(Function) In the present invention, an annular groove is provided in the lower die, a corresponding annular protrusion is provided in the first or second middle die, and the fitting between the groove and the protrusion allows the rubber sheet to be Since an appropriate tension is applied to the central portion in advance before joining, a highly uniform joining can be obtained by appropriately setting the tension strength.

(Example) Hereinafter, the details of the present invention will be explained with reference to the embodiments of the drawings.

First, a first embodiment shown in FIG. 1 will be described. This embodiment is composed of a lower mold 11, a first middle mold 12, a second middle mold 13, and an upper mold 14.

The lower mold 11 has an upper surface 15 formed as a support surface that supports the rubber sheet 2, and this support surface includes a circular central portion support surface 15a that supports the circular central portion 2a of the rubber sheet 2, and an annular central portion support surface 15a that supports the circular central portion 2a of the rubber sheet 2. An outer peripheral part support surface 15b consisting of a part of a conical surface that supports the outer peripheral part 2b of
It is made up of. A tapered engagement portion 16 is formed adjacent to this outer peripheral support surface 15b, and a flat annular tightening portion 17 is provided adjacent to this, and a tightening screw hole 18 is provided here. It is provided. Moreover, between the center support surface 15a and the outer peripheral support surface 15b, the center support surface 15a
An annular groove 19 having a semicircular cross section is formed concentrically with the groove.

Next, the first intermediate die 12 includes an engaged portion 20 consisting of a tapered hole that fits into the engaging portion 16, and a counterbore bolt hole 21 is bored on the outside thereof.
By tightening the bolt 22, this first medium 12
and the lower mold 11 are in pressure contact with each other, and can be separated by loosening the tightening bolts 22. An outer peripheral part holding surface 23 is formed on the upper part of the engaged part 20, and cooperates with the outer peripheral part supporting surface 15b to hold the outer peripheral part 2b of the rubber sheet 2 by pressure contact. In addition, in the center part there is a mounting part 2 that holds a second medium size, which will be described later, in a detachable manner.
4 is provided.

Next, the second middle mold 13 is removably held on the first middle mold by a mounting portion 30 that fits into the mounting portion 24 . Further, a flat pressed portion 31,
It has a tapered valve seat supply hole 32, from which the solenoid valve valve seat 3 is placed on the central part 2a. It is formed to have substantially the same outer diameter as the valve seat 3 for the electromagnetic valve, and constitutes positioning and holding means 33 for the metal member comprising the valve seat 3 for the electromagnetic valve.

Further, an annular protrusion 34 corresponding to the annular groove 19 is provided on the outer side of the lower end of the second medium mold 13, and has a semicircular cross section corresponding to the cross section of the annular groove 19. , is formed in an annular shape,
When it is attached to the first medium mold 12, it fits into the annular groove 19 and pulls the intervening rubber sheet 2 from the outer periphery, so that the central part 2a is pulled up and a uniform tension is generated. The annular groove 19 and the annular convex portion 34 constitute a tensioning means 35.

Next, the upper mold 14 includes a flat pressing surface 41 and a welding head 43 projecting from the flat pressing surface 41 and having a truncated conical shape and having a flat pressing surface 42 at its lower end. Further, the upper surface is formed as a flat receiving surface 44, on which, for example, a pressure body (not shown) is placed to transmit the pressure contact force necessary for vulcanization adhesion.

Next, the operation of this embodiment will be explained using an example in which a vulcanized adhesive is used.

First, the rubber sheet 2 is placed between the lower mold 11 and the first middle mold 12.
, and tighten the first medium 12 with the bolts 22 to make pressure contact, and the outer peripheral part 2b of the rubber sheet 2 is clamped and fixed between the outer peripheral part support surface 15b and the outer peripheral part holding surface 23, and the rubber sheet 2 is After tensioning, the second middle mold 13 is attached to the first middle mold 12. As a result, the annular convex portion 34 fits into the annular groove 19 of the lower mold 11, and the center portion 2a of the rubber sheet 2 is pulled outward, resulting in a state in which appropriate tension is uniformly distributed over the entire surface. It will be done. Next, the solenoid valve seat 3 coated with a vulcanized adhesive and dried is supplied from the valve seat supply hole 32 and placed on the central portion 2a. At this time,
The solenoid valve seat 3 is guided to the center of the central portion 2a by a positioning and holding means 33 consisting of a valve seat supply hole 32, and is surrounded by a periphery to prevent movement and to be held in position. In this state, move the upper mold 14 to the second middle mold 1.
3, place a pressurizing body, for example, an appropriate weight on the receiving surface 44, and press the solenoid valve seat 3 with the pressure contact surface 42.
is brought into pressure contact with the rubber sheet 2, and the pressing surface 4
1, press the entire mold. In this way,
Apply pressure and heat to complete vulcanization and adhesion. At this time, since the rubber sheet 2 has a larger thermal expansion than the metal member, the rubber sheet 2 contracts more when cooled, but the pre-applied tension is taken into account, and the rubber sheet is uniformly and tightly stretched. It is formed.

In addition, in this example, a valve seat for a solenoid valve was used as the metal member, but other metal members may also be used.
In addition, although the cross section of the annular groove was formed into a semicircular shape,
The shape is not limited to this, and may be square. Furthermore,
Although the case where a vulcanized adhesive is used has been described, an instant adhesive may also be used.

Next, a second embodiment will be described with reference to FIG. In this embodiment, the first intermediate mold 12 and the second intermediate mold 13 in the first embodiment are integrated to simplify the structure and reduce the cost. Portions that have substantially the same configuration and function as those in the first embodiment are given the same reference numerals and names, and detailed description thereof will be omitted.

This embodiment includes a lower mold 51, a middle mold 52, and an upper mold 1.
It is composed of 4. The lower mold 51 has an upper surface 56
is formed flat, and is provided with a central support surface 15a and an annular groove 19 similar to the previous embodiment. On the outside of this, a flat outer peripheral support portion 56b is provided.
is provided.

The middle die 52 is attached to the lower die 5 by the tightening bolt 22.
1 and can be separated by loosening, and has an outer peripheral part holding surface 61, which holds the outer peripheral part 2b of the rubber sheet 2 by pressing. In addition, the valve seat supply hole 32 opened in the center part 2a is provided, and the vicinity of the lower end opening serves as a positioning and holding means 33, and an annular convex part 34 is provided, unlike the previous implementation. Similar to the example.

Next, the upper die position 4 has the same configuration as the previous embodiment, and is provided with a welding head 43 having a pressure contact surface 42 that presses against the valve seat 3 for the solenoid valve, a pressing surface 41, a receiving surface 44, etc. .

The operation of this second embodiment is almost the same as that of the first embodiment, so a detailed explanation will be omitted, but in this embodiment, the tensioning means 35 contributes to tensioning the central portion 2a. Since the outer peripheral holding surface 61 makes almost no contribution, the shrinkage rate of the rubber sheet 2 is smaller than that in the previous embodiment.

[Effect of idea]

As detailed above, since the present invention is provided with a tensioning means, by appropriately tensioning the central part in advance, taking into account the effects of thermal distortion, etc., even after cooling, it is possible to maintain a very uniform and good condition. Since the bonding can be performed in a high quality manner, it is possible to provide a metal member to which rubber sheets are bonded in a high-quality state. Further, since a positioning and holding means is provided, even if an instant adhesive is used, there is no possibility of positional deviation, and since pressing can be performed uniformly, there is no possibility of partial peeling.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall structure of the first embodiment of the present invention, FIG. 2 is a sectional view showing the overall structure of the second embodiment, and FIG. 3 is an explanatory perspective view of the conventional example.
FIG. 4 is a sectional view illustrating another conventional example. 2...Rubber sheet, 2a...Central part, 2b...
Outer peripheral part, 3...Metal member (valve seat for solenoid valve), 11
... lower mold, 12 ... first middle mold, 13 ... second middle mold, 14 ... upper mold, 19 ... annular groove, 33 ...
Positioning and holding means, 34... annular convex portion, 35...
Tensioning means, 51...lower mold, 52...middle mold.

Claims (1)

[Scope of utility model registration request] A lower mold that supports the rubber sheet, a first middle mold that can be pressed into and separated from the lower mold and that holds the outer peripheral part of the rubber sheet under pressure, and a second mold that is integral with the lower mold or can be detached from the lower mold.
A tensioning means consisting of a middle die, an annular groove provided in the lower die, and an annular convex part provided in the second middle die, and tensions the central part of the rubber sheet by fitting the groove and the convex part. A jig for joining a metal member and a rubber sheet, comprising: an upper mold for pressing the metal member placed in the central portion and joining the metal member to the rubber sheet; and means for positioning and holding the metal member.