JP2004122198A - Cladding device for inner surface of formed hole of circular cross section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cladding device for cladding an inner surface of a cylindrical pipe W. <P>SOLUTION: A cylindrical die 1 is abutted on an end face of a cylindrical pipe W, and a rotary tool 2 is advanced in the die 1. A large diameter portion 20 to regulate the inside diameter after cladding the cylindrical pipe W and a tapered feed screw portion 21 having a threaded groove 21a in a tip of the large diameter portion 20 are provided on a tip portion of the rotary tool 2. A rear side of a cladding member 3 is screwed to the feed screw portion 21. When the rotary tool 2 is advanced together with the die 1 while being rotated, the cladding member 3 is further threaded and moved backwardly while the die 1 is abutted on the end face of the cylindrical pipe W. The backwardly compressive force is continuously applied to the cladding member 3 through this friction resistance to generate the plastic flow. Further, a portion of the cladded-by-welding member 3 in the previous plastic flow state is cooled to form a cladded layer 3b on the inner surface of the cylindrical pipe W. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a build-up apparatus for forming a build-up with a tubular build-up material on an inner surface of a work-formed hole having a circular cross section in an axial direction formed in a work-piece.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a method of overlaying different or similar metals on the surface of a base material, overlaying by an arc welding method (fading method) has been performed. However, it has been difficult for the arc welding method to build up the inside of the pipe.
Recently, a new welding method called plastic flow welding (Fraction Stir Welding) has been developed.
[Patent Document 1]
Japanese Patent Publication No. 7-5050590
In this plastic flow welding, a probe made of a material harder than the workpiece is inserted into the joint area of the workpiece, and a relative friction circulation between the probe and the workpiece is performed. , And the workpieces are joined to each other with the joining region in a plastic flow state.
[0004]
[Problems to be solved by the invention]
The features of this plastic flow joining include solid-phase joining, which causes crystal refining by plastic flow.However, applicable work materials are limited to planar ones, and three-dimensional curved surfaces Was difficult to apply to the workpiece.
In the present invention, using the principle of plastic flow joining, the inner surface of a cylindrical material or the inner surface of a circular hole formed in a material to be processed is overlaid on the inner surface of a hole to be processed having a circular cross section in the axial direction. The purpose of the present invention is to provide a cladding device suitable for the use.
[0005]
[Means for Solving the Problems]
In view of the above, according to the invention of claim 1, in a build-up apparatus for performing build-up processing using a cylindrical build-up material on an inner surface of a work-formed hole having a circular cross section in the axial direction formed in the work material, It has a cylindrical die that can be advanced to be able to contact the peripheral end surface of the hole to be opened, and a rotating tool that can be advanced through the die. A large-diameter portion that defines a rear inner diameter is provided, and a tapered feed screw portion provided with a thread groove so as to be mounted with a build-up material is provided at the end of the large-diameter portion.
[0006]
With this configuration, a cylindrical die is arranged on the extension of the axis of the hole to be processed having a circular cross section formed in the material to be processed when building up. A rotating tool is provided in this die so that it can advance. At the tip of the rotary tool, a large-diameter portion that defines the inner diameter of the workpiece after the build-up is provided, and a tapered feed screw portion is provided at the tip of the large-diameter portion. A thread groove is provided. The feed screw portion is covered with the rear end of a cylindrical build-up material, the end portion is enlarged in diameter, and one end is screwed into a screw groove for mounting.
[0007]
When the rotary tool is advanced with the die while rotating, the die comes into contact with the peripheral end surface of the hole to be processed, which seals the end surface of the material together with the large-diameter portion. Then, the end of the build-up material comes into contact with the die or the inner surface of the hole to be processed, and the build-up material screwed into the feed screw portion due to the resistance due to the friction moves backward while being further threaded. The build-up material continues to apply a compressive force rearward due to the frictional resistance. Then, a plastic flow is generated in the overlay material existing between the inner surface of the hole to be processed and the large diameter portion.
[0008]
With the advancement of the rotary tool, the build-up material newly located between the inner surface of the hole to be processed and the large diameter portion plastically flows. Further, the portion of the build-up material that has been in the plastic flow state earlier is cooled to form a build-up layer on the inner surface of the hole to be processed. In particular, according to the first aspect of the present invention, since the cladding is performed in a compressed state and the inner diameter after the cladding is defined by the large-diameter portion, a dimensional accuracy is good and a cladding layer having a smooth surface is obtained. be able to.
[0009]
According to the second aspect of the present invention, the rear end portion of the build-up material mounted on the feed screw portion is mounted in a state in which the diameter is larger than the inner diameter of the workpiece. As a result, the build-up material comes into contact with the inner surface of the hole to be machined at the beginning of the build-up process, and the build-up material screwed into the feed screw portion is reliably moved rearward while being further threaded due to the frictional resistance.
[0010]
At this time, if the end of the build-up material is enlarged in advance so that it can be screwed into the feed screw portion and the internal thread portion is formed on the inner surface, the work at the time of performing the build-up process can be speeded up. (Claim 3). On the other hand, if the end of the cladding material comes into contact with the die and is screwed into the feed screw portion to increase the diameter and the female screw portion is formed, the preparatory processing of the cladding material is not required. Item 4).
[0011]
According to a fifth aspect of the present invention, a steer recess continuous with the inner peripheral surface is provided on the distal end surface of the cylindrical die. This makes it easier for the build-up material to undergo plastic flow in the initial stage of processing, and the build-up processing can be performed reliably.
[0012]
In the invention according to claim 6, a support shaft portion for supporting the front side of the overlay is provided at the tip of the feed screw portion. With this support shaft, a cylindrical build-up material is mounted along the axis of the hole to be processed.
[0013]
【The invention's effect】
As described above, according to the first aspect of the present invention, there is provided a build-up apparatus for performing build-up processing with a cylindrical build-up material on an inner surface of a work hole having a circular cross section in an axial direction formed in the work material, It has a cylindrical die that can protrude so as to be able to contact the peripheral end surface of the hole to be processed that is opened in the material to be processed, and a rotating tool that can be advanced inside the die. A large-diameter portion that defines the inner diameter of the material after the build-up is provided, and a tapered feed screw portion provided with a thread groove so as to cover the build-up material and to be mounted is provided at the tip of the large-diameter portion. Thus, the inner surface of the hole to be processed having a circular cross section can be overlaid.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in which an aluminum cylindrical pipe W having an inner diameter D with both ends opened is used as a workpiece, and the cylindrical pipe 3 is made of aluminum of the same material. An example of modifying the inner surface of W will be described in detail with reference to FIGS.
[0015]
As shown in FIG. 1, a thick cylindrical die 1 mounted on a base (not shown) so as to be able to advance and retreat has an annular steer recess concentric with the die 1 at the leading end surface thereof. 10 are provided. A rotary tool 2 that is rotatable by a drive motor (not shown) and that can move forward and backward is provided inside the die 1. A large diameter portion 20 having a large diameter d is provided at the tip of the rotary tool 2. This diameter d is adjusted to the thickness (Dd) of the cladding layer 3b applied to the inner surface of the cylindrical tube W.
[0016]
Further, a feed screw portion 21 tapered from the tip of the large diameter portion 20 and having a thread groove 21a formed of a male screw having a pitch of 1 mm, for example, is provided on the outer surface thereof. Further, a support shaft portion 22 that extends slightly from the tip of the feed screw portion 21 along the axis so as to be slightly thinner than the inner diameter of the cylindrical build-up material 3 is provided.
[0017]
2 and 3 show an example of a cylindrical build-up material 3 whose outer diameter is smaller than the inner diameter D so that it can be inserted into the cylindrical pipe W, and a plurality of which are provided on the outer periphery in the axial direction. The groove 30 is formed, and its outer diameter (thickness) is increased with respect to the amount required for the overlay material per unit length. In addition, as a preliminary work of the overlaying work, as shown in FIG. 2, the diameter of the cylindrical pipe W is increased from one side to an intermediate position so that the outer diameter of the end of the cylindrical pipe W is larger than the inner diameter. A female screw 31 that can be screwed to the male screw 21 a of the feed screw portion 21 is provided on the inner surface of the enlarged portion.
[0018]
The operation of the present embodiment having such a configuration will be described.
FIG. 4 shows a set state before the build-up processing, in which the cylindrical tube W is fixed to a position where the axis of the rotary tool 2 is shared by a fixing means such as a fixed chuck (not shown). Is located at the retracted position. The cladding material 3 is set by screwing the female screw portion 31 thereof into the feed screw portion 21. Accordingly, the right side (hereinafter, referred to as a rear portion) of the cylindrical building material 3 in FIG. 4 is screwed into the feed screw portion 21 and the left side (hereinafter, referred to as a front portion) is supported. The rotation tool 2 is supported by the shaft portion 22 and is arranged substantially in common with the axis of the rotating tool 2.
[0019]
Next, the drive motor is driven to rotate the rotary tool 2, and the die 1 moves forward together with the rotary tool 2. At this time, the overlay 3 is rotating together with the rotating tool 2 to be screwed. When the die 1 and the rotary tool 2 move forward, the point X on the outer surface of the intermediate portion of the overlay 3 comes into contact with the end of the cylindrical tube W as shown in FIG. As a result, a frictional force acts on the cylindrical tube W, and the build-up material 3 is prevented from rotating together with the rotating tool 2. That is, the overlay 3 relatively rotates with the rotary tool 2 and moves rearward with respect to the feed screw portion 21 while cutting a female screw on the inner surface of the overlay 3 to form the overlay. The rear end of the die 3 comes into contact in the steer recess 10 of the die 1 (see FIG. 6).
In this embodiment, the outer diameter of the overlay required per unit length is increased by providing a plurality of grooves 30 in the overlay 3 in the axial direction. Thereby, compared with the example in which the groove 30 is not provided, it is possible to surely come into contact with the end of the cylindrical pipe W and move the overlay 3 relatively to the rotating tool 2 rearward.
[0020]
Subsequently, as shown in FIG. 7, the front end surface of the die 1 abuts on the rear end surface of the cylindrical tube W, and is brought into close contact with the steer recess 10 as a closed space. As a result, the die 1 stops moving forward and maintains this sealed state, and the rear end portion Y of the overlay 3 is formed by the steer recess 10 and the rear end of the cylindrical tube W and the large diameter portion 20 of the rotary tool 2. Continuously rotate within the gap.
[0021]
The rear end of the overlay 3 in contact with the steer recess 10 rotates while receiving a strong compressive force and heats up due to frictional heat with the wall surface of the steer recess 10 and has a melting point or less, but is in a softened state, so-called. Then, a plastic flow phenomenon occurs, and the inside of the closed space becomes a plastic flow layer 3a and is filled.
[0022]
While forming the plastic fluidized bed 3a by the plastic flow phenomenon, the rotary tool 2 continues to rotate and advance, and the leading end of the large diameter portion 20 which moves from the feed screw portion 21 to the large diameter portion 20 (point in FIG. 7). Z portion), a plastic flow phenomenon occurs. That is, the overlay 3 is pushed into the gap between the cylindrical tube W and the large-diameter portion 20 while applying a compressive force to the rotating tool 2 rearward. The temperature rises due to frictional heat during the period, causing a plastic flow phenomenon. At the same time, the plastic fluidized layer 3a in the steer recess 10 is cooled to form a build-up layer 3b joined to the end face of the cylindrical pipe W made of the same material.
[0023]
Further, with the rotation and advancement of the rotary tool 2, the point Z at which the plastic flow phenomenon occurs advances sequentially, and accordingly, the position of the plastic fluidized bed 3a advances, and the cylindrical pipe W is located behind the point Z. The build-up layer 3b joined to the inner surface of is formed.
[0024]
In addition, the force which strongly presses the inner surface of the cylindrical pipe W and prevents it from rotating together with the rotating tool 2 acts on the outer surface of the overlay 3. Due to this obstructive force, the rotational force of the feed screw portion 21 further cuts a female screw on the inner surface of the build-up material 3, and a force that moves relatively backward with respect to the feed screw portion 21 acts. A large compressive force is continuously applied to the overlay 3 to be made. On the other hand, when the gap between the cylindrical pipe W and the large-diameter portion 20 is filled with the overlay 3 at the point Z, on the other hand, it cannot move rearward relative to the feed screw portion 21, so that it follows the rotary tool 2. It is forcibly rotated, and intense friction occurs between the overlay 3 and the cylindrical tube W. Then, as the rotary tool 2 moves forward, the rotary tool 2 moves relatively rearward with respect to the feed screw portion 21, and the overlay 3 is filled in the gap between the cylindrical pipe W and the large diameter portion 20. As described above, the cladding is performed in a compressed state, and the inner diameter after the cladding is defined by the large-diameter portion 20, so that the cladding layer 3b having good dimensional accuracy and a smooth surface can be obtained. it can.
[0025]
FIG. 1 shows a state in which the point Z has advanced to an intermediate position of the cylindrical pipe W, and the cladding material 3 is screwed into the feed screw portion 21 and the diameter thereof gradually increases, and the relative position with respect to the feed screw portion 21 increases. To the large-diameter portion 20 and, at the point Z, undergoes plastic flow and becomes a plastic fluidized bed 3a. Then, the plastic fluidized bed 3a that has deviated from the point Z with the advance of the rotary tool 2 is cooled and becomes the build-up layer 3b joined to the inner surface of the cylindrical pipe W. In this way, as the rotary tool 2 advances, the build-up layer 3b is sequentially formed on the inner surface of the cylindrical tube W, and the rotary tool 2 moves to the forefront end of the cylindrical tube W to complete the build-up operation.
[0026]
In the above-described embodiment, an example is described in which the aluminum cylinder is a cylindrical tube W, and the same type of aluminum cladding layer 3b is formed on the inner surface of the cylindrical tube W. Any material that is softer than the material of the rotating tool 2 can be applied, and can be implemented without being limited to aluminum.
[0027]
In addition, although the example in which the workpiece is the cylindrical tube W has been described, the workpiece is not limited to the cylindrical pipe, and a circular hole formed in the workpiece can be overlaid.
In addition, as shown in FIG. 5, an example in which the outer surface of the intermediate portion of the cladding material 3 directly abuts on the end surface of the cylindrical pipe W at the point X in the initial stage of the processing is shown, but as shown in FIG. It is also possible to adopt a configuration in which it is fixed to the periphery of the hole to be processed and indirectly abuts.
[0028]
Further, the example in which the outer surface of the intermediate portion of the cladding material 3 abuts on the end of the cylindrical tube W is shown, but the outer surface of the intermediate portion of the cladding material 3 does not necessarily need to abut on the end of the cylindrical tube W.
[0029]
Further, the embodiment in which the cylindrical tube W is fixed and the rotating tool 2 is rotated has been described. However, it is sufficient to relatively rotate the cylindrical tube W and the rotating tool 2, and while rotating the cylindrical tube W, The rotation tool 2 can be fixed and implemented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state in which a cladding is being processed. FIG. 2 is a partially cutaway front view of the cladding having an enlarged diameter at one end. FIG. 3 is a side view of the cladding. FIG. FIG. 5 is a partial cross-sectional view showing a starting state of processing. FIG. 5 is a partial cross-sectional view showing a state in which the overlay is in contact with the workpiece at point X. FIG. FIG. 7 is a partial cross-sectional view showing a state in which a build-up material is in the process of plastic flow. FIG. 7 is a partial cross-sectional view showing a state in which a build-up material has started plastic flow. Cross-sectional view [Description of symbols]
DESCRIPTION OF SYMBOLS 1 ... Die 2 ... Rotary tool 3 ... Overlay material 3a ... Plastic fluidized bed 3b ... Overlay layer 10 ... Steer recess 20 ... Large diameter part 21 ... Feed screw part

Claims (6)

In a build-up device for performing build-up processing with a cylindrical build-up material on the inner surface of a work hole having a circular cross section in the axial direction formed in the work material,
A cylindrical die that is advanced to be able to contact the peripheral end surface of the processed hole that is opened in the processed material, and a rotating tool that can be advanced through the die,
At the tip of the rotating tool, a large-diameter portion that defines the inner diameter of the work material after the build-up is provided, and a thread groove is provided on the front end of the large-diameter portion so that the build-up material can be covered and mounted. An overfilling device for an inner surface of a hole to be processed having a circular cross section, wherein the tapered feed screw portion provided is provided. 2. The build-up on the inner surface of the hole having a circular cross section according to claim 1, wherein the rear end of the build-up material mounted on the feed screw portion has a larger diameter than the inner diameter of the work. apparatus. 3. A cladding material according to claim 2, wherein a female screw portion is provided which is enlarged in diameter so as to be attachable to the feed screw portion and is screwed into the screw groove. 3. The cladding material according to claim 2, wherein a female screw portion is formed by the feed screw portion, the diameter of the female screw portion is increased, and the feed screw portion is mounted on the feed screw portion. 2. A device for overlaying a hole to be processed with a circular cross section on the inner surface of the die according to claim 1, wherein a steer recess which is continuous with the inner peripheral surface is provided at a tip end surface of the die. 2. The apparatus according to claim 1, wherein a support shaft for supporting a front side of the build-up material is provided at a tip of the feed screw.

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