JPH08290275A - Jig for diffusion welding - Google Patents

Abstract

PURPOSE: To provide a jig for the diffusion welding which is applicable to the working of an article where the precision is requested, and especially, capable of the uniform extrusion during the treatment required for the diffusion welding of the metal by composing of a holding part consisting of the carbon composite material reinforced by the carbon fiber and an extruding part consisting of the elastic material to extrude the holding part. CONSTITUTION: The carbon composite material is the composite material obtained by a method wherein the carbon fiber impregnated with the hydrocarbon resin, the tar or pitch is treated at 1000-2000 deg.C to be carbonized, or by a method wherein the lower hydrocarbon such as methane is brought into contact with the carbon fiber which is kept at a high temperature to be carbonized, and simultaneously adhere the carbonized one to the fiber, and a jig for the diffusion welding of the target shape is formed by a method such as the pressing method. A holding part 1 to hold the material 3 to be worked is extruded by upper and lower supporting plates 2 through an elastic member such as a spring 5. The coefficient of thermal expansion of the stock to constitute the jig is small, the deformation during the hot working can be suppressed, the thermal conductivity is excellent, and the thermal efficiency during the hot working is excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig used for mechanical processing, heat processing and the like of metals and the like. More specifically, it relates to a jig for diffusion bonding, which is made of a carbon-based composite material.

[0002]

2. Description of the Related Art When joining the same kind of metal or different kinds of metal to form a desired shape, a solid phase joining method is, for example, a vacuum hot press method or a vacuum furnace. There is a so-called diffusion bonding method in which vacuum heating is performed while bonding is performed while applying a large weight. Diffusion bonding is a method of bonding materials in a solid phase without melting them by utilizing the diffusion phenomenon of atoms. In this method, the joining surfaces are brought into contact with each other,
This is a method in which the contact area is increased by heating and pressurization, and the voids shrink and disappear at the joint, and then the joint is performed.

Conventionally, most of the processing jigs used in such mechanical processing are made of metal such as high speed steel and tool steel. Of course, mechanical processing and thermal processing of metal etc. are often performed with mechanical distortion or at high temperature, sometimes in corrosive atmosphere, and jigs made of ordinary metal are heat resistant, Although it has excellent corrosion resistance, it has a relatively large coefficient of thermal expansion and a large weight, so that it is not always sufficient in terms of handling. Also, the equipment itself is often very expensive.

Recently, the precision of the products to be handled has advanced, and along with this, high dimensional stability has been demanded. However, it is inevitable that jigs used for processing these products are also required to have high performance. It has become. In particular, the diffusion bonding method as described above is often used for surface-to-surface bonding, bonding of special shapes, and bonding of objects requiring high precision and high quality, and therefore the jig used in this method In particular, there is a demand for a mechanism in which a uniform force is applied to the entire joint portion.

Further, hot isostatic pressing (HIP) processing is
It is a treatment method of heating under an inert gas pressure to remove material and product defects and defects, and the product is sealed in a heating furnace (HIP furnace). The jigs used at this time are mainly austenitic steel. Although the metal jig configured as above is used, the metal jig is heavy and inevitably limits the processing amount.
Also, when joining metals using the above-mentioned vacuum furnace, for example, 0.2m is applied to a joined object having a size of 200 m / m × 200 m / m.
Weight is 8000kg when a joint load of kg / mm ² is applied.
The weight of the floor is required, and the normal floor load capacity (500-200
(0 kg) furnace cannot be treated, and it is economically problematic to take appropriate measures for furnaces and jigs.

[0006]

The object of the present invention can be applied to the processing of products (materials, products, etc.) that require precision and precision, and particularly, in the processing required for diffusion bonding of metals. An object of the present invention is to provide a jig for diffusion bonding that can be pressed uniformly, is lightweight, and is easy to handle.

[0007]

In order to solve the above-mentioned problems, the present inventors have studied various jigs and materials constituting them, and as a result, have found that the elasticity made of a carbonaceous material is used. The present invention has been completed based on the finding that a jig in which a material to be handled is pressed and sandwiched by using a member sufficiently satisfies the above object.

That is, the present invention relates to a diffusion bonding jig composed of a holding part made of a carbon-based composite material reinforced with carbon fibers and a pressing part made of an elastic member for pressing the holding part. is there.

Next, the present invention will be described in more detail. The jig of the present invention is characterized in that it is made of a carbon-based composite material reinforced with carbon fibers (hereinafter abbreviated as carbon-based composite material).

The carbon-based composite material constituting the present invention is a method of carbonizing carbon resin impregnated with a hydrocarbon-based resin, tar, pitch, etc. at 1000 to 2000 ° C. to carbonize them, or The jig of the present invention is a composite material obtained by a method of contacting a lower hydrocarbon such as methane with a carbon fiber kept at a temperature to carbonize it and at the same time attaching it to the fiber. It is molded into the desired shape.

The composition of the carbon-based composite material used in the present invention is
There is no particular limitation, and the fiber content is about 20 to 50.
A composite material of about% is sufficient.

The carbon-based composite material thus obtained has a specific gravity of about 1.5 to 2.0 and is extremely lightweight, and has a compressive strength,
Bending strengths of 20 to 25 Kg / mm ² and 30 Kg / mm ² or more, respectively, show sufficient strength. Also, the coefficient of thermal expansion is 1.1 × 10 ^-6
Very small, about / ° C.

Next, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a cross-sectional view of one embodiment of the diffusion bonding jig of the present invention, which is a portion for sandwiching a material to be processed (sandwiching portion).
Shows an example in which two upper and lower flat plates (support plates) are used. In the figure, 1 is a sandwiching portion, 2 is a support plate that constitutes the sandwiching portion, and 3 is a material to be processed. When the holding part consists of a flat plate, its size is appropriately determined depending on the size of the material to be processed, the size of the furnace when processing it, etc., but if the flat surface is square, one side is about 400 mm to 1200 mm When the plane is circular, the diameter is about 300 to 1200 mm and the thickness is about 10 to 50 mm.

Reference numeral 4 in the drawing denotes a pressing portion made of an elastic member that further characterizes the present invention. The elastic member used here is, for example, a spring. In the figure, 5 is a spring, and 6 is a pressing plate for pressing the spring. In this example, the sandwiching portion sandwiching the material is pressed from the outside of the sandwiching portion (in FIG. 1, an example having a spring on the upper side is shown). This pressing part (elastic member, pressing plate, etc.) is also made of a carbon-based composite material, and one having a strength (pressing force) appropriately determined according to the material to be processed is used, but usually up to about 1000 kg. The standard is one that can withstand the load.

The shape of the elastic member used in the present invention is not particularly limited, but when a spring is used, a compression coil spring, a torsion coil spring, a flat spring, a leaf spring or the like can be used as appropriate. Generally, it is preferable to use a flat spring when the load is large and a coil spring when the load is small.

When a spring is used as the elastic member, a plurality of springs can be used, and the plurality of holding parts can be pressed on the upper and lower sides of the holding part via the elastic member. it can. FIG. 2 shows an example having a plurality of holding portions, and FIG. 3 shows an example of a structure having a plurality of holding portions and pressing the respective holding portions via the pressing portions.

If necessary, the clamping portion and the pressing portion are supporting portions (support pillars; 7 in the drawing), and it is a stable work to fix them together with the clamping portion and the pressing plate (6 in the drawing) of the elastic member (spring). Is preferable for performing. For example, a spirally-supported support column is used, and a corresponding nut (8 in the figure) is used to adjust and fix the material to be processed in a state of being pressed by a predetermined pressure.

As described above, the jig of the present invention is used for diffusion bonding of metals and the like.

[0019]

【Example】

Example 1 Using the jig having the structure shown in FIG. 1, 200 m / m × 200 m /
Copper materials having a size of m × 2 t were joined together. The jig is
The carbon-based composite material containing 50% of carbon fiber was processed into each shape and obtained by hot pressing at 2000 ° C. and about 50 atm. The material characteristics of the obtained jig were as follows. Density: 1.7 g / cm ³ , compressive strength: 25
Kg / mm ² , bending strength: 40 Kg / mm ² , thermal expansion coefficient: 1.
1 × 10 ^-6 / ° C. Also, high temperature strength is 18 Kg / m at 1000 ° C.
m ² .

The structure of the jig is 400 × 60 as a holding part.
0m / m x 20t, one each on top and bottom, 500kg as pressing part
15 coil springs with a load of 300 x 400 m / m
It is fixed by a plate of × 20t, and these four corners are fixed by a support pillar of 80 m / mφ.

The copper material is clamped by the clamp portion of the jig, the spring of the pressing portion is adjusted, and a load of 0.3 kg / mm ² (total load 12000 kg) is applied, and the temperature is precisely controlled at 850 ° C. for 60 minutes. It was heated in a chamber vacuum furnace. Copper material weight is 1.5kg, jig weight is 16
kg. The copper bonding material obtained by cooling to room temperature after the heat treatment showed a base material fracture value of 22 to 25 kg / mm 2.

Example 2 A titanium material of 200 m / m × 200 m / m × 10 t was used in Example 1.
The joining process was performed using the same jig. Bonding load 0.
The sample was heated in the vacuum furnace used in Example 1 at 900 ° C. for 5 hours at 1 kg / mm ² (total load of 4000 kg). 45 materials joined
A base material rupture value of ˜46 kg / mm 2 was shown.

[0023]

The jig of the present invention is lightweight, easy to handle, and has good workability. In addition, since the material forming the jig has a small coefficient of thermal expansion, deformation during thermal processing can be suppressed, and thermal conductivity is excellent, so thermal efficiency during thermal processing is good. Further, since the mechanism is such that the elastic material (spring) presses the processed material, the processed surface of the material can be pressed with a uniform force, and a product having a uniform processed portion can be obtained.

As described above, according to the present invention, the processing material can be pressed by a uniform force to be processed. Further, the processing material is made of a carbon-based composite material against expansion during heating and contraction during cooling. With the elastic member, uniform force can be applied as needed.

[Brief description of drawings]

FIG. 1 is a view showing a cross section of a jig of an embodiment in which a material is sandwiched.

FIG. 2 is a view showing a cross section of a jig of one embodiment having a plurality of holding parts.

FIG. 3 is a diagram showing a cross section of a jig according to an embodiment in which a plurality of holding portions are held via pressing portions.

[Explanation of symbols]

 1: Clamping part 2: Support plate that constitutes the clamping part 3: Material to be processed 4: Pressing part 5: Spring 6: Pressing plate 7: Supporting pillar 8: Nut

Claims (1)

[Claims] 1. A diffusion bonding jig comprising a holding part made of a carbon-based composite material reinforced with carbon fibers and a pressing part made of an elastic member for pressing the holding part.