JP3769062B2 - Burring method and apparatus using spinning machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a burring method for forming a cylindrical protrusion in a plane of a plate-like material, particularly a thick plate-like material.
[0002]
[Prior art]
The burring method for forming cylindrical projections in the plane of the plate-like material was formed by press work as shown in FIG. When pressing, a hole a having a predetermined diameter is appropriately formed in the surface of the plate-like material A, and then a pressing die P having a diameter larger than the hole a is pressed by a lifting cylinder or the like (not shown). Thus, by pressing the hole H and the center of the press die P so as to coincide with each other, the hole a of the plate-shaped material is expanded to form the expanded hole B having a predetermined diameter, and the cylindrical protrusion J is formed.
[0003]
[Problems to be solved by the invention]
However, in this case, the base of the cylindrical protrusion J formed as shown in FIG. This point does not become a problem when the inner and outer diameters of the cylindrical portion are not processed thereafter, but there are problems such as a case where a desired processing accuracy cannot be obtained in the secondary processing, such as when the part is a precision machine.
Furthermore, when press working, there is a limit to the height H of the cylindrical projection J due to the thickness of the plate, and the thickness cannot be set freely, and cracks will occur if a cylinder exceeding a certain height is to be formed. There were problems such as causing cracks.
[0004]
In view of this point, the present invention maintains sufficient accuracy for the inner and outer diameter processing of the cylindrical portion without generating a gap F at the base of the cylindrical portion, and sets the height and thickness of the cylindrical portion to predetermined values. An object is to provide a burring method that can be processed.
[0005]
[Means for Solving the Problems]
According to a first invention for achieving the above object, in a burring process for forming a cylindrical projection in a plane of a plate-like material, a plate-like material having a hole with a predetermined diameter is fixed to a rotating main shaft, A plate-like material is rotated together with the rotation main shaft, a truncated cone tool having a concave arc is inserted into the hole parallel to the rotation main shaft, a bent portion is formed with the hole end bent inside, and then a nipple roller is used. The bent portion is rolled to a predetermined length.
[0006]
In the present invention composed of the above method, even in the case of a thick plate-like material, the bent portion is formed by bending the hole end portion with a truncated cone tool before the rolling process by the nipple roller. In rolling with a roller, a cylindrical protrusion having a desired height and thickness can be obtained without applying an excessive load to the material and the roller, and high-accuracy processing can be performed when processing the inner and outer diameters thereafter.
[0007]
The second invention is characterized in that, in the molding method, the insertion direction of the frustum tool is a direction inclined with respect to the combined direction of the expanding direction and the extending direction with respect to the hole of the plate-like material. It is.
[0008]
When using the above method, since the insertion direction of the truncated cone tool is a direction inclined by a predetermined angle with respect to the rotation axis of the rotation main shaft, compared to the case where the insertion direction is parallel to the rotation axis of the rotation main shaft, Since the pressing force applied to the hole end from the truncated cone tool is distributed in parallel and at right angles to the material, it is possible to effectively prevent initial cracks and cracks without applying an excessive load to the base of the cylindrical part (perforated part). Can do.
[0009]
According to a third aspect of the present invention, in the molding method, an outer diameter regulating die for regulating the outer diameter of the cylindrical projection is attached to the rotation main shaft, and the outer diameter of the cylindrical projection is reduced by rolling a nipple roller. It is characterized by being molded along the inner surface of the regulation mold.
[0010]
When the above method is used, since the outer diameter regulating die is attached to the rotation main shaft, the accuracy of the outer diameter of the cylindrical protrusion can be easily ensured.
[0011]
The fourth invention relates to an apparatus for carrying out the above method, in a spinning machine having a rotation main shaft, a gripping member for fixing a plate-like material to the rotation main shaft, and a turret base to which a plurality of tools can be attached. The rotation main shaft is attached with an outer diameter restricting die for restricting the outer diameter of the cylindrical protrusion, and the turret base has a concave arcuate slope that bends the hole end of the plate-like material to form a bent portion. A truncated cone tool and a nipple roller for rolling the bent portion in accordance with the outer diameter regulating die are provided.
[0012]
According to the above apparatus, a desired cylindrical protrusion can be formed on a plate-like material that has been subjected to hole machining of a predetermined diameter with one apparatus without going through a plurality of setup changes and multiple processes.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a spinning machine M for carrying out the method of the present invention. A plate-like material A (hereinafter referred to as “material A”) is a plate-like one that has been subjected to appropriate hole processing such as a press machine. The mandrel N of the rotating spindle D of the spinning machine M and the gripping member T are clamped and fixed. K denotes an outer diameter regulating die that regulates the outer diameter of the cylindrical protrusion attached to the mandrel N of the rotating spindle D. C denotes a reciprocating tool table, and a turret table E is attached to the tool table C, and the bend roller R1 in the first step of the truncated cone having a concave arc on the slope and the nipple roller for rolling process in the second step Install R2. Each roller R1, R2 is preferably held rotatably. G1 represents a traverse pulse motor for the tool table C, and G2 represents a forward / backward pulse motor for the turret table E.
[0014]
In the present invention, the above-mentioned tools are used to sequentially perform processing, and the burring method for forming cylindrical projections in the plane of the plate-like material includes the first step shown in FIGS. 2 to 3 and FIG. It consists of the 2nd process shown.
[0015]
First, a material A that has been drilled with a predetermined diameter is attached to a mandrel N so that the central axis of the rotation main shaft D coincides with the center of the hole a of the material A. In addition, when attaching a drill tool to the turret stand E, it is not necessary to drill a hole in the material A in advance, and the hole a may be drilled with a drill tool before the first step described later. The gripping member T is composed of a fixed portion T1 and an operating portion T2 that are fixed to the side surface (circumferential surface) of the mandrel N by appropriate means, and a plurality (three to four) are attached to the circumference of the mandrel. The material A is fixed by pressing the operating portion T2 against the mandrel N by an appropriate means.
[0016]
In the first step, as shown in FIG. 2, the material A is rotated and the bending roller R1 is inserted into the hole a. The bending roller R1 is a frustoconical tool having a sloped ra as a concave arc, and the radius of the arc is appropriately selected according to the diameter of the hole a and the diameter of the hole to be expanded. It is preferable to make it large. The end of the hole a is widened by pressing the bending roller R1 against the end of the hole a in the direction of the arrow Y1, that is, the combined direction of the expanding direction Z and the extending direction X along the rotation main axis. Opened and stretched to form a bent portion S bent inward as shown in FIG.
[0017]
At this time, it is possible to insert and form the bending roller R1 parallel to the rotation main shaft D, but as shown by the arrow Y1, the angle in the above-mentioned synthesis direction (about 45 degrees with respect to the rotation main shaft). Is preferable), the pressing force applied to the end of the hole is distributed in a direction parallel to and perpendicular to the material, so that no excessive load is applied to the end without causing cracks or cracks.
[0018]
Next, in the second step, as shown in FIG. 4, a nipple roller R2 having a work roll shape portion at the tip is pressed against the bent portion S and rolled in the direction of arrow Y2. At this time, the nipple roller R2 reciprocates in the extending direction, that is, the arrow Y2 direction, and rolls along the inner surface of the outer diameter regulating die K to form a cylindrical protrusion V having a desired thickness and height.
[0019]
When the material A is thin, the cylindrical protrusion V can be formed only by the second step without going through the first step.
[0020]
FIG. 5 shows a cross-sectional view of a finished product W molded by the molding method of the present invention. However, the figure shows an example in which the thickness of the cylindrical protrusion V is thinner than that of the bottom surface L. Of course, this can be the same thickness, or the cylindrical protrusion V can be thicker than the plane L. .
[0021]
【The invention's effect】
As described above, according to the present invention, a projection having a small diameter and a long height can be formed in the plane of the plate-like material as compared with the press working, and the bent portion is pushed along the outer diameter regulating die. Since it is bent, voids and sagging do not occur in the bent portion caused by the conventional press working. In addition, even a thick plate material can easily form a cylindrical portion having a predetermined outer diameter and thickness without causing cracks or cracks.
In addition, since the accuracy of the outer diameter and the like at that time can be maintained high, the accuracy of the secondary processing can be increased even when the cylindrical projection is subjected to secondary processing with respect to the inner and outer diameters. It has the effect of being possible.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view of a spinning machine for carrying out the method of the present invention.
FIG. 2 is an explanatory diagram showing a processing procedure showing a first step of the molding method of the present invention.
FIG. 3 shows a molded part obtained by processing in the first step of the molding method of the present invention.
FIG. 4 is an explanatory diagram of a processing procedure showing a second step of the molding method of the present invention.
FIG. 5 is a sectional view of a finished product molded by the molding method of the present invention.
FIG. 6 is an explanatory diagram of press working, which is a conventional working method.
FIG. 7 shows a molded part formed by a conventional processing method.
[Explanation of symbols]
A Plate material R1 Bending roller R2 Nipple roller D Spindle T Gripping member K Outer diameter regulating die M Spinning machine S Bending part

Claims (4)

In the burring process for forming a cylindrical projection in the plane of the plate-like material, the plate-like material having a hole with a predetermined diameter is fixed to the rotation main shaft, the plate-like material is rotated together with the rotation main shaft, and the slope is A concave circular truncated cone tool is inserted into the hole parallel to the rotation spindle, and a bent portion is formed by bending the end of the hole inward, and then the bent portion is formed into a cylindrical protrusion having a predetermined length by a nipple roller. A burring method using a spinning machine, characterized by rolling.   2. A burring method using a spinning machine according to claim 1, wherein the insertion direction of the truncated cone tool is a direction inclined with respect to a direction in which the expanding direction and the extending direction are combined with respect to the hole of the plate-like material.   An outer diameter restricting die for restricting the outer diameter of the cylindrical protrusion is attached to the rotation main shaft, and the outer diameter of the cylindrical protrusion is formed along the inner surface of the outer diameter restricting die by rolling of a nipple roller. A burring method using a spinning machine according to claim 1 or 2.   In a spinning machine having a rotation main shaft, a gripping member for fixing a plate-like material to the rotation main shaft, and a turret base to which a plurality of tools can be attached, the rotation main shaft has an outer diameter that regulates the outer diameter of the cylindrical protrusion. A restricting die is attached, and the turret base is bent into the shape of the bent portion by bending the hole end portion of the plate-shaped material inside, and the conical frustum tool having a concave arc, and the bent portion following the outer diameter restricting die. A spinning machine provided with a nipple roller for rolling.

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