JP2001322020A - Deburring method and device for forging member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate uncut parts of burrs, regardless of dispersion of the height of burrs. SOLUTION: Burrs are eliminated up to the finish height by eliminating burrs of a corner part 3a of a longitudinal direction of a shank part 3 up to a prescribed height in a primary deburring and pressing an end mill 21 on the corner part 3a of the longitudinal direction of the shank part 3 by substantially constant pressure in a secondary deburring, for front and rear sides of a work W.

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 deburring a forged member such as a connecting rod used for an automobile engine.

[0002]

2. Description of the Related Art Compared with a general forged connecting rod, a sinter forged connecting rod differs in the position and direction in which burrs come out.

[0003] Conventional deburring methods can be broadly classified into two types: (i) a milling method and (ii) a grinding method.

(I) The milling method is mainly a processing by a robot, and is a method in which the robot grips a workpiece or a cutting tool to perform the processing.

(Ii) The grinding method is a method in which a workpiece is pressed against a rotating grinding wheel or sand belt by a robot or a dedicated machine.

As a conventional method for deburring a forged member, for example, JP-A-8-290327 describes a method for deburring a fixed work with a cutter having a floating mechanism.

[0007]

In the above-mentioned milling method, if the burr height is high, the uncut portion is generated at the time of cutting, so that the burr height is regulated at the time of forging. For this reason, it is necessary to frequently perform mold correction due to mold wear. In addition, since the machining is performed according to the teaching of the robot irrespective of the work shape (variation in dimensions), there is a problem that the machining amount varies due to the difference in the flash height.

In the above-mentioned grinding method, only the burrs at a specific portion (the I portion of the connecting rod) can be removed from the burrs, and the R shape of the corner portion varies depending on the burring height. There is a problem that it cannot be controlled. Further, in order to prevent the abrasion and breakage of the sand belt, there is a problem that processing cannot be performed at a high work temperature and cooling is required.

The technique described in the above publication has a drawback that the cutter is floatingly supported, so that uncut portions are generated due to variations in flash height.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and an apparatus for deburring a forged member capable of eliminating uncut burrs regardless of variations in burrs. is there.

[0011]

In order to solve the above-mentioned problems and achieve the object, a method for deburring a forged member according to the present invention is a method for deburring a forged member, comprising the steps of: Fixed to a support, with the support as a position reference,
Primary deburring is performed on the front surface of the forged member so as to make the height of the burr of the forged member uniform, and secondary deburring is carried out by the burring cutting means which is supported on the support base so as to be floatable and can move along the shape of the forged member. Deburr.

Preferably, the primary deburring includes:
The height of the forged member is adjusted to the height of the largest protrusion.

Preferably, the primary and secondary deburring uses an end mill.

A deburring apparatus for a forged member according to the present invention is a deburring apparatus for a forged member, comprising: fixing means for fixing the forged member to a predetermined support base; Primary deburring means for performing primary deburring on the front surface of the forged member so as to make the burr height uniform, and burr cutting means supported by the support table so as to be floatable and movable along the shape of the forged member. And a secondary deburring means for performing secondary deburring according to the above.

[0015]

As described above, according to the first and fourth aspects of the present invention, the forging member is fixed to a predetermined support, and the forging is performed so that the burr heights of the forged member are aligned with respect to the support. Primary deburring of the front surface of the member is performed, and secondary deburring is performed by a deburring means which is supported on the support base so as to be able to float and can move along the shape of the forged member, thereby eliminating variations in flash height. Burrs can be eliminated.

According to the second aspect of the present invention, the primary deburring is performed by adjusting the height of the maximum protruding portion of the forged member.
It can prevent shaving of the base material.

According to the third aspect of the present invention, the primary and secondary deburring can be performed at low cost by using the end mill.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing the entire structure of a forging member deburring apparatus according to this embodiment. FIG. 2 is a top view of FIG. FIG. 3 is a side view showing the work and the work transfer device. FIG. 4 is a top view of FIG.

1 to 4, the deburring apparatus of this embodiment is used for deburring a connecting rod used for an automobile engine, and a connecting rod serving as a work W is formed by sintering forging. It is a member. The work W includes a large-diameter crank bore portion 1 that is supported by a crankshaft, a small-diameter pin bore portion 2 that is supported by a piston pin, and a shank portion that connects the crank bore portion 1 and the pin bore portion 2 ( I) 3).

The deburring device transports the workpiece W on the transport path 4 in one direction D1 perpendicular to the shank portion 3,
A work transfer device 5 that lifts the work W in the up and down direction and fixes the work W to the clamp mechanism 6 so as to be put into each processing step
And the crank bore portion 1 arranged on the upstream side on the conveying path 4.
A primary deburring device 10 for deburring the inner ring portion 1a and deburring the longitudinal corner 3a of the shank portion 3 and the surface portion 2a of the pin bore portion 2, and is disposed downstream from the primary deburring device 10. And a secondary deburring device 20 for performing deburring on the corner 3a of the shank 3 in the longitudinal direction.

Further, on the transport path 4 downstream of the primary deburring device 10 and the secondary deburring device 20,
A set of identically configured primary and secondary deburring devices 10, 20 is provided.

The primary and secondary deburring devices 10 and 20 disposed upstream of the transport path 4 perform deburring of one surface of the work W, and after completion of the deburring of one surface, transfer of the workpiece. The primary and secondary deburring devices 10 and 20 after the clamp mechanism 6 of the device 5 turns the work W upside down and is arranged on the downstream side of the transport path 4, similarly deburr the other surface of the work W.

The work transfer device 5 includes a lift unit 7 that moves on the transfer path 4 and a process P1 on the transfer path 4 that clamps the work W transferred in the primary and secondary deburring steps.
And a clamp mechanism 6 arranged for each of P9 to P9. The lift unit 7 moves up and moves forward to convey the work W in a lifted state, and the clamp mechanism 6 lowers the lift unit 7 to clamp the work W. The workpiece W is positioned horizontally by the three positioning pins 6b and fixed horizontally by the gripping portions 6a.

The clamp mechanism 6 has a cooling mechanism using air cooling in order to prevent the cylinder seal from being broken due to the heat of the work W. The two positioning pins 6b and the shank 3 provided symmetrically on the crank bore 1 side. The holding portion 6a is pressed and sandwiched between the crank bore portion 1 and the pin bore portion 2 of the work W from both sides in the longitudinal direction while being held by one positioning pin 6b provided on the pin bore portion 2 side of the work W. The work W is fixed.

The primary and secondary deburring devices 1
The clamp mechanism 6 disposed at P5 between the 0 and 20 and the subsequent primary and secondary deburring devices 10 and 20 completes deburring of one surface by the primary and secondary deburring devices 10 and 20. After that, a reversing mechanism 8 for turning over the work W while clamping it is mounted.

FIG. 5 is a view of the primary deburring apparatus 10 viewed from the direction of the transport path. FIG. 6 is a diagram showing an air floating mechanism, an electric spindle, and an end mill. FIG.
8 is a sectional view of the air floating mechanism.
FIG. 9 is a view of the air floating mechanism as viewed from below.

As shown in FIG. 5, the primary deburring device 10
Is a Z for deburring the inner ring portion 1a of the crank bore portion 1.
An end mill 12 that moves in the X direction and an end mill 16 that moves in the X direction for deburring the longitudinal corner 3a of the shank 3 and the surface 2a of the pin bore 2.

The processing end of the end mill 12 is formed in a tapered shape extending upward and larger than the inner diameter of the crank bore portion 1, and is driven to rotate by an electric spindle 13. The electric spindle 13 is fixed to the Z arm 15 of the robot 11 having the Z arm 15 movable in the Z direction, and moves the end mill 12 in the vertical direction.

The end mill 16 is driven to rotate by an electric spindle 17. The electric spindle 17 is fixed to the X arm 14 and the Z arm 15 of the robot 11 and moves the end mill 16 in the longitudinal direction and the Z direction of the workpiece W.

FIG. 6 is a view of the secondary deburring device 20 viewed from the direction of the transport path. FIG. 7 is a diagram illustrating an air floating mechanism, an electric spindle, and an end mill. FIG.
9 is a sectional view of the air floating mechanism.
FIG. 10 is a view of the air floating mechanism as viewed from below.

As shown in FIG. 6, the secondary deburring device 20
Is provided with an end mill 21 that freely moves in the XYZ directions for performing deburring on the corner 3a of the shank 3 in the longitudinal direction.

The processing end of the end mill 21 is driven to rotate by an air spindle 22. The air spindle 22 is floatingly supported by the air floating mechanism 18 and is fixed to the arm 32 of the six-axis articulated robot 31, and the end mill 21 is inclined with respect to the longitudinal corner 3 a of the shank 3 of the work W. The workpiece W moves in the longitudinal direction of the workpiece W in a state where the workpiece W abuts and is inclined obliquely with respect to the traveling direction of the end mill 21.

As shown in FIGS. 7 to 10, the air floating mechanism 18 includes a plurality of cylinders 18a formed in a circumferential shape, and a plurality of pistons 18b slidably provided in the respective cylinders 18a. An air passage 18c communicating with the cylinder 18a and applying an air pressure to the piston from the outside to drive the piston is formed.
A predetermined air pressure (for example, 20 to 40 N) is applied to the piston 18b so that the pressing force of the air spindle 22 against the work W is substantially constant, and the air spindle 22 is positioned with respect to the rotation center 18d against the pressing force of the piston 18b. As a predetermined range θ. [Deburring] Next, deburring of a connecting rod using the deburring apparatus of the present embodiment will be described.

The deburring is performed according to the following procedure.

After the work W is fixed by the clamp mechanism 6 at the position P1, the work W is transported to the position P2 by the lift unit 7, and the crank deflector 1 and the shank portion of the work W are used by using the primary deburring device 10. 3. Deburr one side. In this step, the work W is set on the positioning pin 6b so that the work W can be fixed by the gripping portion 6a of the clamp mechanism 6 irrespective of the burring height. In addition to removing the burrs of the portion 1a, the end mill 16 removes the burrs of the surface portion 2a of the pin bore portion 2 and the longitudinal corners 3a of the shank portion 3.
Remove the flash to a predetermined height.

The end mill 16 has a locus K1 shown in FIG.
By teaching the robot 11 as shown in ~ 9,
After processing the surface portion 2a of the pin bore portion 2, the longitudinal corner portion 3a of the shank portion 3 is processed. End mill 16
Is moved to the height of the maximum projecting portion between the surface portion 2a of the pin bore portion 2 and the longitudinal corner 3a of the shank portion 3.

Next, the work W is moved to the position P via the position P3.
The workpiece W is transported to the workpiece 4, and the surface of the shank 3 of the workpiece W is subjected to finish deburring using the secondary deburring apparatus 20 described above.
In this step, as shown in FIGS. 12 and 13, the end mill 21 is abutted obliquely to the longitudinal corner 3 a of the shank 3 of the workpiece W, and obliquely to the traveling direction of the end mill 21. While moving in the longitudinal direction of the workpiece W in the fall state, the burrs are removed to the finished height by pressing the floating supported end mill 21 against the longitudinal corner 3a of the shank 3 at a constant pressure.

Next, at the position P5, the work W is turned over by the reversing mechanism 8 and conveyed to the position P6, and the crank bore portion 1 and the shank portion 3 are moved using the primary deburring device 10 to be described later.
Deburr the other side.

Next, the work W is moved to the position P via the position P7.
The workpiece W is conveyed to 8 and the other surface of the shank 3 of the work W is subjected to finish deburring using the secondary deburring device 20.
This step is performed in the same manner as the above step.

Finally, after the work W is transported to the position P9, the work W is removed. This step is performed in the same manner as the above step.

In the above, the work W is set on the positioning pin 6b so that it can be fixed by the gripping portion 6a of the clamp mechanism 6 regardless of the burring height, and the robot 11 is machined by the end mill 16 while performing two-axis synchronous control.

As described above, with respect to the front and back of the work W,
By removing the burrs at the corners 3a in the longitudinal direction of the shank portion 3 to a predetermined height by primary deburring, the end mill 21 is pressed against the longitudinal corners 3a of the shank portion 3 at a substantially constant pressure by secondary deburring. By being able to remove burrs to the finishing height, it is possible to eliminate variations in burrs by primary deburring and eliminate residual burrs, and to reduce the burring height of the machined surface to the desired height compared to conventional products. it can.

It should be noted that the present invention can be applied to a modification or a modification of the above embodiment without departing from the gist thereof.

For example, after the first deburring is performed on the front and back surfaces of the work W, the second deburring may be performed. in this case,
The workpiece W is not fixed by the clamp mechanism 6, but is held by the robot hand, and the end mill 2 is fixed to another place.
Deburring may be performed by pressing against 1. This allows
Since the front and back can be processed in one process, the cycle time can be reduced.

Further, by making the end mill 16 movable in the X and Y directions, the machining position of the tool can be changed, so that the tool life can be extended.

Further, the number of primary and secondary deburring devices may be increased in consideration of the cycle time.

Further, in the first deburring, the robot is moved and machined as previously taught, but when it is desired to regulate the burr height with higher precision, the burr height on the surface of the work W is determined by a contact type or Processing may be performed by detecting with a non-contact type sensor and feeding back this detection data to the robot side to determine the movement amount of the robot.

[Brief description of the drawings]

FIG. 1 is a side view showing the overall configuration of a forged member deburring device of the present embodiment.

FIG. 2 is a top view of FIG.

FIG. 3 is a side view showing a work and a work transfer device.

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a view of the primary deburring device as viewed from a conveying path direction.

FIG. 6 is a view of the secondary deburring device as viewed from a conveying path direction.

FIG. 7 is a diagram showing an air floating mechanism, an electric spindle, and an end mill.

FIG. 8 is a sectional view of an air floating mechanism.

FIG. 9 is a sectional view of the air floating mechanism.

FIG. 10 is a view of the air floating mechanism as viewed from below.

FIG. 11 is a diagram showing an operation locus of an end mill at the time of preliminary deburring in primary deburring.

FIG. 12 is a view showing the movement of an end mill in secondary deburring.

FIG. 13 is a view showing movement of an end mill by secondary deburring.

[Explanation of symbols]

 Reference Signs List 4 transport path 5 work transport device 6 clamp mechanism 7 lift mechanism 8 reversing mechanism 10 primary deburring device 20 secondary deburring device W workpiece

Claims (4)

[Claims] 1. A deburring method for a forged member, comprising: fixing the forged member to a predetermined support; and setting a burr height of the forged member to be uniform with respect to the support based on a position of the forged member. A deburring method for a forged member, comprising: performing a primary deburring; performing a secondary deburring by a deburring means which is floatably supported on the support table and movable along the shape of the forged member. . 2. The deburring method for a forged member according to claim 1, wherein the primary deburring is performed at a height of a maximum protruding portion of the forged member. 3. The deburring method for a forged member according to claim 1, wherein the first and second deburring uses an end mill. 4. A deburring device for a forged member, comprising: fixing means for fixing the forged member to a predetermined support; and forging the forged member so that the burr heights of the forged member are aligned with respect to the support. A primary deburring means for performing primary deburring on the front surface of the member; and a secondary deburring means for performing deburring by means of a deburring means which is floatably supported on the support table and movable along the shape of the forged member. A deburring device for a forged member, comprising: deburring means.