JPS6059069B2 - How to braze metal parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining metal parts, for example, a method for joining a lining member and a backing member of a member that requires wear resistance, such as a mold lining.

In general, press dies, such as press dies for metal plates, forging dies for steel and non-ferrous metals, molten glass press molds, or molds for molding plastics, rubber, etc., are used for processing workpieces. Excellent wear resistance is required for the surfaces that come into contact with the guide, sliding surfaces for guides, and the inner surface of the nozzle.

Conventionally, die steel, austenitic stainless steel, martensitic stainless steel, etc. have been used for such wear-resistant members, or these steels have been coated with hard chrome plating or hard self-fusing alloys (such as Coromonoy). It has been used with

However, the die steel and stainless steel are not only expensive materials but also inherently hard, so they cannot be cut into molds.
The drawback was that grinding and polishing required a great deal of labor and time.

Furthermore, when these processed parts are subjected to a coating treatment such as chrome plating, the cost increases further. In order to solve these difficulties, recently, parts that require strong wear resistance are used as lining members, and the parts that support the lining members are used as lining members, and the parts that support the lining members are used as lining members. Separate parts according to their desired functions,
A method of combining these methods has been adopted.

For example, a method of creating a lining member by electroforming, creating a mountain lining member by machining, and fitting the lining member together; (2) a method of molding the lining member by powder metallurgy and combining it with the lining member; (3) A method is known in which a mold for a lining member is created and the mold is cast together with the lining member to join the mold. Such a method is
Although it is advantageous in terms of ease of work and economy, fitting the lining to a machined lining member does not provide a strong bond between the two, and the casting method also suffers from volume shrinkage due to solidification of the molten metal. In addition to causing defects such as the formation of internal cavities, the bonding state between the two is also insufficient.

Powder metallurgy also involves volumetric shrinkage during sintering, and is not necessarily favorable. Furthermore, attempts have been made to join the ends of the lining member and the backing member by a known welding method, such as brazing, but there are problems in terms of joint strength. In particular, when the joint area is large, the joint strength becomes weak because welding cannot be performed over the entire surface. Another method is to inject brazing material into the gap between the lining member and the backing member while heating the lining member with a gas burner, but with this method, the gap between the two cannot be completely filled with the brazing material, and the void is However, there are also problems in terms of strength.

Especially when the joint does not have a simple shape, it is extremely difficult to fill the gap between the two with the brazing material. In the case of such a joint between the lining member and the backing member, the joint between the two must be completely integrated and strong, and if there is an air layer in the gap between the two, For example, metal members that require heating and cooling are undesirable because they may cause defects such as peeling of the metal members during use.

Furthermore, heating of the lining member reduces the hardness of the lining member, resulting in problems such as insufficient abrasion resistance. SUMMARY OF THE INVENTION In view of the deficiencies of the prior art, it is an object of the present invention to provide a method for brazing metal members that strengthens the bond between a lining member and a backing member and completely integrates the two. Yet another object of the present invention is to provide a method for manufacturing a metal member with excellent thermal conductivity by eliminating the air layer in the gap between a lining member and a backing member by filling with a brazing material. , has the following features and effects.

That is, the joining part of the processed and formed backing member is formed into a concave shape, a molten brazing material for metal joining is present in the recessed part, and while the molten state of the brazing material is maintained, the other member is heated to zero. .The molten brazing filler metal is press-fitted at a pressure of 1 to 100k9/Cli to completely fill the minute gap between the joint surfaces of both members, and the two members are joined by cooling while maintaining the press-fitting state. This is a characteristic feature.

By adopting this joining method, the defects of the conventional method have been eliminated, and an extremely strong connection between the lining member and the backing member can be obtained, and various metal parts that require wear resistance can be produced easily and inexpensively. It is something that will be done.

Hereinafter, the contents of the present invention will be explained in detail with reference to the drawings. In the first step of the bonding method of the present invention, for example, as shown in FIG. 1, the surface of the backing member 1 to be bonded to the lining member 2 is formed into a concave shape.

This backing member 1 is formed by a mechanical cutting method, a casting method, a powder metallurgy method, or the like. The material of the backing member 1 is appropriately determined depending on the intended use of the metal member. For example, in the case of a mold used for hot molding of materials, such as a mold for molding molten glass or a mold for plastic molding, it is preferable to use a copper alloy in order to promote heat dissipation of the mold. but,
The material of the backing member 1 must be determined by taking other factors into account, such as the processing speed of the glass molding machine or the plastic molding machine. Next, the second step is a step of filling the recessed portion with a brazing material 3 for bonding.

Even if this brazing filler metal 3 is in a molten state beforehand,
Although it may be in an unmolten state, it is necessary that it be in a molten state when the lining member 2 is press-fitted. Therefore, heating operation of the lining member 1 is performed as necessary. Next, the third step is to press the lining member 2 against the joint surface.

The force required for pressing must be large enough to extrude the molten brazing filler metal 3 from the lower part of the concave shape and completely fill the gap between the lining member 2 and the backing member 1, as shown in the opening in Figure 1. Must be. Therefore, this size varies depending on the width of the gap between the two, the type of brazing filler metal 3, the temperature, etc., and is determined as appropriate. If the pressure is less than 0.1k9/d, the brazing filler metal cannot be expected to sufficiently wrap around the gap between the two, and 100k9/CFl! This is not preferable because the lining member may undergo destructive deformation or the brazing material may not remain in the gap between the two.

The final step of the present invention is the process of cooling the metal members that have been fitted and integrated as described above.

During cooling, forced air cooling is performed while maintaining the state at the end of the press-fitting to solidify the brazing filler metal 3. Further, FIG. 2 shows a diagram of a bonding state of a backing member 1 such as a guide during manufacturing of a rolled metal plate.

FIG. 1 shows a method of brazing a cylindrical lining member (metal member), while FIG. 2 shows a method of brazing a joining member of a flaky metal member. In this case as well, the lining member 1 is formed into a concave shape, and the lining member 2 is formed in this portion.
Press in. The thickness of the lining member 2 does not necessarily have to match the depth of the concave shape of the backing member 1. If the method of the present invention is applied, so-called clad material (glued material)
can be easily manufactured. In addition, in order to improve the adhesive strength after fitting (joining), appropriate irregularities may be formed on part or all of the fitting (joining) surfaces of the two.

For example, a groove may be formed to promote the flow of the brazing material 3 when the lining member 2 is press-fitted. Moreover, the lining member 2 to be fitted (joined) does not need to be a simple cylinder or a flat plate. For example, the lining member 2 may have a wave shape or a complicated uneven shape. Next, examples of the present invention will be shown.

Example 1 A lining member made of a nickel-cobalt alloy with a thickness of 3 Tnm was manufactured by electroforming, and its end surface was processed.

A lining member having a shape similar to the outer shape of this lining member was manufactured by lathe machining, and the gap between the lining member and the lining member was set to 0.3 to 0.5 mm. Next, a pre-calculated amount of silver brazing material was placed in the form of small pieces into the concave portion of the backing member, and the material was heated and melted together with the backing member at 900° C. in an electric furnace. Thereafter, this was immediately taken out of the furnace, and a lining member to which flux had been applied beforehand was press-fitted into the recess at a pressure of 1.0 k9/d until it was confirmed that the silver brazing material overflowed from the gap. Next, compressed air was immediately applied to cool the integrated metal components. As a result of examining the metal member manufactured as described above for the presence of brazing filler metal using an ultrasonic inspection method, it was confirmed that the brazing filler metal was spread over the entire joint surface.

20,000 glass cups were press molded using this metal member as a glass molding mold, but no peeling between the lining member and the backing member was observed.

On the other hand, with a glass molding mold in which both ends of the lining member and backing member are simply brazed, the brazed portions will peel off after only one glass cup has been molded.
Glass molding work was discontinued. Example 2 A 20% copper-iron alloy powder was used as a lining member, and after shaping and sintering, it was fitted with a lining member in the same manner as in Example 1.

The thermal conductivity of the obtained metal member is 0.164ca1/A
n. sec. It was warm at ℃. This is a stainless steel alloy (SUS3O) that is conventionally used as a mold material for glass molding.
9S)'s 0.06ca1/C7F! ．． Sec. ℃, cast iron (C: 3.64%, Ni: 1.21%, Cr: 0.32
%, CU: 1.18%, Fe: balance %) of 0.09Ca
I/C7l. sec. It showed better thermal conductivity than ℃. L

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and both FIGS. 1 and 2 are schematic sectional views of embodiments of the joining method. 1... Backing member, 2... Lining member, 3... Brazing material.

Claims (1)

[Claims] 1. A method of brazing a lining member and a backing member, including the following steps: (a) of the backing member;
(b) a molten brazing filler metal for metal bonding is present in the concave portion, and (c) the lining member is bonded to the lining member while maintaining the molten state of the brazing filler metal.
By press-fitting with a pressure of 1 to 100 kg/cm^2, the molten brazing filler metal completely fills the minute gap between the joint surfaces of both members,
(d) Cooling while maintaining the press-fitted state to join both members. A method for brazing metal members, characterized by: 2. The molten brazing filler metal for metal bonding is either a brazing filler metal that is already molten and placed into the recess of the backing member, or it is placed in an unmolten state and heated together with the backing member that has the recess to melt it. Claim 1, which is a brazing filler metal
Method for brazing metal parts as described in section.