JP2000301366A - Method and device for building up welding hole part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute building up welding of a hole part with suppressing deformation and strength lowering due to heat in a method and a device for building up welding the hole part. SOLUTION: A method consists of a process to insert a sleeve 4 formed with a welding material in a hole part 3a, and a process to press fit a friction bar 1 formed so that a part of an outer diameter is larger than an inner diameter of the sleeve or the outer diameter is gradually tapered off toward its tip, or having a recessed and projection part on an outer peripheral surface while rotating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for building a hole in a base material for building up a hole in a base material for repairing wear or cracks.

[0002]

2. Description of the Related Art In some cases, the inside of a hole is overlaid for wear or crack repair of the hole of a mechanical part. In the conventional method, the holes were built up by melt welding such as TIG welding (inert gas arc welding using a tungsten electrode).

[0003]

However, the following problems remain with the conventional overlaying means. That is, when repairing a hole in a light metal such as an aluminum alloy, the TI
When the overlaying is performed by fusion welding such as G welding, the temperature becomes considerably high, so that the heat may cause deformation of the component or a decrease in the mechanical strength of the material, resulting in poor overlaying.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a method and an apparatus for overlaying a hole capable of overlaying the hole while suppressing deformation and reduction in strength due to heat. The purpose is to:

[0005]

The present invention has the following features to attain the object mentioned above. In other words, in the method for overlaying a hole according to claim 1, a step of inserting a sleeve formed of a welding material into the hole and rotating a friction bar having at least a part of an outer diameter larger than the inner diameter of the sleeve. While press-fitting into the hole.

According to a second aspect of the present invention, a friction bar having at least a part of an outer diameter larger than the inner diameter of a sleeve inserted into the hole, a friction rod rotated and press-fitted into the hole. And a driving means for performing the driving.

In the method and the apparatus for building up the hole, the friction bar having at least a part of the outer diameter larger than the inner diameter of the sleeve is pressed into the hole while rotating.
Heat is generated by friction at the contact surface between the sleeve and the friction bar, and the sleeve is plasticized by the frictional heat generated between the sleeve and the friction bar, and the plasticizing component is caused to flow by the movement (rotation and press fitting) of the friction bar. Mix the sleeve and the base material. At this time, since the temperature is not raised to the melting point of the base material, deformation and a decrease in strength are suppressed, and a good build-up of the hole can be achieved.

According to a third aspect of the present invention, in the second aspect of the present invention, the friction bar has an outer diameter gradually reduced toward a tip. Is done.

[0009] In this hole overlaying device, since the outer diameter of the friction bar is gradually reduced toward the tip, the outer peripheral surface of the friction bar becomes tapered with respect to the inner peripheral surface of the sleeve. The contact surface at the time of press-fitting increases, and plastic flow and high heat generation can be obtained in a wide range.

According to a fourth aspect of the present invention, the outer diameter of the tip of the friction bar is larger than the inner diameter of the sleeve. Technology is adopted.

[0011] In this padding apparatus, since the outer diameter of the tip of the friction bar is larger than the inner diameter of the sleeve, a part of the tip surface of the friction bar comes into contact with the sleeve and a higher contact pressure than the outer peripheral surface is applied. Thereby, high frictional heat is generated at the tip end surface, and plastic fluidity can be enhanced.

According to a fifth aspect of the present invention, in the second aspect of the present invention, a technique is employed in which the friction bar has an uneven portion formed on an outer peripheral surface thereof.

[0013] In this apparatus for building up a hole, since an uneven portion is formed on the outer peripheral surface of the friction bar, the area of contact with the sleeve is increased by the uneven portion, and the plastic fluidity is further increased.

According to a sixth aspect of the present invention, there is provided a hole-building device according to the fifth aspect, wherein the uneven portion is formed in a direction opposite to the rotational direction of the friction bar. The technology of a spiral ridge is employed.

[0015] In the hole overlaying device, since the uneven portion is a spiral ridge formed on the outer peripheral surface of the friction bar in a reverse screw direction to the rotational direction, the spiral ridge is formed. Heat is obtained in a wide range by the part, and since it is formed in the reverse screw direction, the flow toward the bottom of the hole is forcibly generated,
High plastic fluidity can be obtained, and the joining strength can be further improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a method and an apparatus for overlaying a hole according to the present invention will be described below with reference to FIGS. In these figures, reference numeral 1 denotes a friction bar, 2 denotes a driving means, 3 denotes a base material, and 4 denotes a sleeve.

As shown in FIG. 1, a cladding apparatus used in the cladding method of this embodiment is, for example, a base material 3 made of an aluminum alloy (in this embodiment, a plate-like material having a uniform thickness). ) Is a device for repairing the inside of a relatively small hole 3a (for example, a hole for a pin) formed in
A friction rod 1 which is a rotatable plug formed of tool steel;
And a driving means 2 for rotating the friction rod 1 at a predetermined rotation speed and moving the friction rod 1 in an axial direction.

The method of overlaying the hole 3a by this overlaying apparatus will be described below. First, the sleeve 4 having an outer diameter slightly smaller than the inner diameter is inserted into the hole 3a, and the contact plate 5 is applied to the lower surface of the base material 3 so that the sleeve 4 does not fall off. The sleeve 4 is formed of an aluminum alloy which is the same material as the base material 3 as a welding material.
Further, the friction bar 1 is formed in a cylindrical shape, and its outer diameter is set to be larger than the inner diameter of the sleeve 4 and smaller than the inner diameter of the hole 3a.

Next, in this state, the friction rod 1 is
As a result, as shown in FIG. 2, it is pressed into the sleeve 4. At this time, the outer edge of the tip surface 1a of the friction bar 1 mainly contacts the sleeve 4 to generate frictional heat. The sleeve 4 and the base material 3 are heated by the frictional heat to a temperature lower than the melting point of the aluminum alloy forming the sleeve 4 and the base material 3 and to a temperature sufficient for plastic flow.

Further, when the friction bar 1 is press-fitted, the plasticizing component of the sleeve 4 flows on the tip end surface 1a to mix and join the sleeve 4 and the base material 3, so that the inside of the hole 3a is built up. Is done. As described above, according to the method for overlaying the holes of the present embodiment, since the temperature is not raised to the melting point of the base material 3, deformation and a decrease in strength are suppressed, and favorable overlaying of the holes 3a can be achieved.

Next, a second embodiment of a method and an apparatus for overlaying holes according to the present invention will be described with reference to FIGS.

The difference between the second embodiment and the first embodiment is that in the first embodiment, the cylindrical friction bar 1 is rotationally press-fitted, whereas in the second embodiment, it is shown in FIG. 3 and FIG. Thus, the difference is that the friction bar 11 whose outer diameter is gradually reduced toward the tip is rotated and pressed into the hole 3a.

That is, in the first embodiment, since the heat-generating portion is limited to a part of the tip end surface 1a of the friction bar 1, the heat-generating portion is localized and the plastic flow is small, whereas In the second embodiment, the outer peripheral surface 11b of the friction bar 11 has a tapered shape that is inclined with respect to the inner peripheral surface of the sleeve 4, the contact surface at the time of press-fitting increases, and high heat can be obtained in a wide range. Therefore, in the present embodiment, by making the plastic flow large, heat can be generated in the entire insertion portion, and the time required for overlaying can be reduced,
Mechanical strength (joining strength) can be further improved.

In this embodiment, since the outer diameter of the tip of the friction bar 11 is larger than the inner diameter of the sleeve 4, a part of the tip surface 11a of the friction bar 11 contacts the sleeve 4 as in the first embodiment. As a result, frictional heat is generated. Therefore, in the present embodiment, since both surfaces of the distal end surface 11a and the outer peripheral surface 11b are in contact with the sleeve 4, the plastic fluidity is further improved as compared to the case where only the distal end surface is in contact or only the outer peripheral surface is in contact. be able to.

Next, a third embodiment of a method and an apparatus for overlaying a hole according to the present invention will be described with reference to FIGS.

The difference between the third embodiment and the first embodiment is that, in the first embodiment, the outer peripheral surface of the friction bar 1 is a flat curved surface, whereas in the third embodiment, FIGS. As shown in (1), the outer peripheral surface of the friction bar 21 is formed with a ridge (concavo-convex portion) 21a that is spiral in a reverse screw direction to the rotation direction. That is, in the third embodiment, heat is obtained in a wide range by the projecting ridge 21a having the reverse screw shape, and a flow in the bottom direction (press-fitting direction) of the hole 3a is forcibly generated, so that high plastic fluidity is obtained. Can be obtained, and the joining strength can be further improved.

The present invention includes the following embodiments. (1) In each of the above embodiments, the sleeve 4 made of the same material as the base material 3 is used, but the sleeve may be formed of another material as long as the material is applicable to the build-up as a welding material.

(2) In the third embodiment, the spiral ridge 21a having a reverse screw shape is formed on the outer peripheral surface of the friction rod 21.
Even if it is not a reverse screw shape, even if an uneven portion of another shape is formed on the outer peripheral surface, the contact area with the sleeve increases, and an effect of improving plastic fluidity can be obtained. However, as described in the third embodiment, if the screw is formed in the reverse screw shape, plastic flow can be forcibly generated in the press-fitting direction by rotation of the friction bar.

(3) In the third embodiment, the spiral projection 21a is formed on the substantially cylindrical friction bar 21. However, as in the second embodiment, the outer periphery of the tapered friction bar 21 is formed. A similar spiral ridge may be formed on the surface.

[0030]

According to the present invention, the following effects can be obtained. (1) A method for overlaying a hole according to claim 1, and claim 2.
According to the above described padding apparatus for the hole, the friction rod having at least a part of the outer diameter larger than the inner diameter of the sleeve is pressed into the hole while rotating, so that the frictional heat is not raised to the melting point of the base material without increasing the temperature. By plasticizing the sleeve with plastic movement by the movement of the friction bar, deformation of parts and reduction in mechanical strength can be suppressed. Therefore, compared with the conventional method of overlaying by welding on the hole, deterioration can be remarkably reduced, and good overlay having high joining strength can be achieved.

(2) According to the third aspect of the present invention, since the outer diameter of the friction bar gradually decreases toward the tip, the contact surface increases due to the tapered outer peripheral surface. High heat generation can be obtained in a wide range, the time required for overlaying can be shortened, plastic flow can be caused in a wide range, and mechanical strength can be further improved.

According to the third aspect of the present invention, since the outer diameter of the tip of the friction bar is larger than the inner diameter of the sleeve, the tip surface of the friction bar also contacts the sleeve and generates heat. Thereby, the plastic fluidity can be further enhanced by the effects of both the outer peripheral surface and the front end surface.

(4) According to the hole filling device of the fifth aspect, since the uneven portion is formed on the outer peripheral surface of the friction bar, the contact area with the sleeve is increased by the uneven portion,
Further, plastic fluidity is increased.

(5) According to the hole filling apparatus of the sixth aspect, the uneven portion is a spiral ridge formed on the outer peripheral surface of the friction bar in a reverse screw direction to the rotation direction. As a result, heat can be obtained in a wide range, and plastic flow is forcibly caused in the press-fitting direction, so that the joining strength can be further improved.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view of a main part showing a state before press-fitting in a first embodiment of a method for overlaying holes and an overlaying apparatus according to the present invention.

FIG. 2 is a cross-sectional view of a main part showing a state after press-fitting in the first embodiment of the method for overlaying holes and the overlaying apparatus according to the present invention.

FIG. 3 is a cutaway perspective view of a main part showing a state before press-fitting in a second embodiment of a method for overlaying holes and an apparatus for overlaying holes according to the present invention.

FIG. 4 is a sectional view of a main part showing a state after press-fitting in a second embodiment of a method for overlaying holes and an overlaying apparatus according to the present invention.

FIG. 5 is a cutaway perspective view of a main part showing a state before press-fitting according to a third embodiment of a method for overlaying holes and an overlaying apparatus according to the present invention.

FIG. 6 is a cross-sectional view of a main part showing a state after press-fitting in a third embodiment of a method for overlaying holes and an overlaying apparatus according to the present invention.

[Explanation of symbols]

 1, 11, 21 Friction bar 1a, 11a Tip surface of friction bar 11b Outer peripheral surface of friction bar 2 Driving means 3 Base material 3a Hole 4 Sleeve 21a Ridges

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Kashiwagi 229 Togaya, Mizuho-cho, Nishitama-gun, Tokyo Ishikawashima Harima Heavy Industries, Ltd. Mizuho Plant F-term (reference) 4E067 AA05 BG00

Claims (6)

[Claims] 1. A step of inserting a sleeve formed of a welding material into a hole, and a step of press-fitting the friction rod having at least a part of an outer diameter larger than the inner diameter of the sleeve while rotating the friction rod. A method for overlaying a hole, comprising: 2. A friction rod having at least a part of an outer diameter larger than an inner diameter of a sleeve inserted into the hole, and a driving means for rotating the friction rod and press-fitting the hole into the hole. Overlay equipment for holes. 3. The apparatus according to claim 2, wherein the outer diameter of the friction bar is gradually reduced toward the tip. 4. The apparatus according to claim 2, wherein the outer diameter of the tip of the friction bar is larger than the inner diameter of the sleeve. 5. The overlaying apparatus according to claim 2, wherein the friction bar has an uneven portion formed on an outer peripheral surface thereof. 6. The overfilling of the hole according to claim 5, wherein the uneven portion is a spiral ridge formed in a reverse screw direction to a rotation direction of the friction bar. apparatus.