JPH06238508A - Cutting of machined article and its device - Google Patents

Abstract

PURPOSE:To improve quality of a material for upsetting and extrusion moulding by cold forgin operation. CONSTITUTION:By a cutting machine furnished with a chuck 10, a cutter 20 and a pressure body 30, a machined article sequentially delivered by specified length is rotated by way of holding it by the chuck 10, a cutout groove if formed by cutting in the delivered machined article (r) by the cutter 20, and simultaneously the machined article (r) is sequentially cut off in the specified length by way of pressing a front end of the cutout groove by the pressure body 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting a work and an apparatus therefor, and particularly to improve the quality of a material used for cold forging and the like. The material is cut in such a manner that the cut surface of the material is cut at right angles to its axis.

[0002]

2. Description of the Related Art In recent years, with the development of lubricants, molds, press equipment, etc., parts processing by cold forging has become remarkable.

As a material to be molded by the cold forging, a bar material such as round steel cut by a cutting machine is used.

FIG. 6 (a) shows a conventional example thereof, in which r is a workpiece, that is, a bar, and 1 and 2 are upper and lower blades, respectively.

As is clear from this figure, as a conventional material for cold forging, a work r is sheared by an upper blade 1 and a lower blade 2 of a cutting machine.

That is, the workpiece r is sent to the stopper 3 fixed to the cutting machine, and the workpiece r is sent out to the lower blade 2.
The material is sequentially manufactured by supporting it with the upper blade 1 and lowering the upper blade 1 from above to press the workpiece r, and shearing the workpiece r sent out by the upper blade 1 and the lower blade 2. It

Incidentally, FIG. 6 (b) shows one raw material r'obtained by cutting the workpiece r.

[0008]

However, the quality of the material cut and manufactured in the conventional manner is inferior.
In some cases, post-processing such as cold forging cannot be performed.

That is, according to the conventional method of cutting a work by applying a shear load to the work, the upper blade and the lower blade cause the work to crack and cut, so that the cut-off material is deformed. The cut surface has an inclined shape, and the material does not have a cylindrical shape as shown in FIG. 6 (b).

For this reason, for example, when a screw is molded by upsetting or a pipe is molded by extrusion molding, the material may not fit the mold, or the molded product may have uneven thickness. .

Further, according to the above-mentioned conventional cutting method, it is difficult to adjust the clearance between the upper blade and the lower blade, and there is a drawback that the blade is significantly worn due to material strength.

The present invention has been made in view of the above circumstances, and an object thereof is to improve a method for cutting a workpiece and an apparatus therefor, and to provide a high-quality raw material for a subsequent process such as cold forging. It is a thing.

[0013]

SUMMARY OF THE INVENTION According to the present invention, a workpiece which is sequentially fed out by a predetermined length is rotated to form a notch groove in the fed workpiece, and a front end of the notch groove is pressed to work the workpiece. The above object is achieved by providing a method for cutting a workpiece, which is characterized in that

Further, according to the present invention, in a cutting machine for sequentially feeding and cutting a workpiece in a longitudinal direction thereof, a chuck for rotating and holding the workpiece, a cutter for cutting the fed workpiece, and a tip of the workpiece. The above object is achieved by providing a cutting machine that is provided with a pressing body that presses against to cut a workpiece from the cut portion.

Further, according to the present invention, a receiving roller which is arranged in the vicinity of the chuck and which supports a lower surface of the delivered workpiece, and a receiving roller which is arranged in the longitudinal direction of the workpiece and positions the delivered workpiece at a predetermined position. The above object is achieved by providing a cutting machine having a movable shaft that can be moved back and forth.

[0016]

According to the present invention, it is possible to sequentially cut the workpieces fed out by a predetermined length, and in particular, the cutting surface can be cut at a right angle to the axial direction of the workpiece. .

The workpiece is sent out by a predetermined length and held by the chuck each time, and further rotates together with the chuck.

The cutter is brought into contact with the delivered work piece in a state of being orthogonal thereto, and this gradually cuts the work piece to form a notch groove.

Therefore, when the tip of the work piece is pressed, stress concentrates in the formed notch groove, and the work piece eventually breaks from the notch groove.

Therefore, the work piece is cut along the cutout groove, and the cut surface is in a state substantially perpendicular to the axial direction of the work piece.

In the present invention, since stress is concentrated on the workpiece to cut the workpiece, the load applied is small,
No significant deformation occurs in the material, that is, the cut work piece.

[0022]

EXAMPLES Examples of the present invention will be described below with reference to FIGS.
This will be described in detail with reference to FIGS. 3, 4, and 5.

FIG. 1 shows a main part of a cutting machine according to the present invention, in which r is a workpiece, 10 is a chuck, 20 is a cutter, 30 is a pressing body, and 50 is a receiving roller.

The chuck 10 is composed of a collet chuck 12 for holding a workpiece r, a spindle 14 to which the collet chuck 12 is attached, and a collet cap 16 for clamping the tip of the collet chuck 12, 14 is rotated by a motor (not shown), the collet chuck 12 is interlocked with this, and the collet cap 16 has its tip 16a connected to an air cylinder (not shown), so that the collet cap 16 is oriented in the longitudinal direction of the workpiece r It is designed to move forward and backward.

The workpiece r is a rod material such as round steel, and the collet cap 16 advances to clamp the tip of the collet chuck 12, and the collet chuck 12 clamps the tip of the workpiece r. When it is clamped and held, it rotates, and when the collet cap 16 retracts and the clamped state is released, it is pushed by an air cylinder (not shown) and sent forward in the longitudinal direction.

Then, the sent-out workpiece r stops when its tip comes into contact with the movable shaft 60 provided in the longitudinal front of the workpiece r.

The movable shaft 60, which is an air cylinder, is in an expanded state when the workpiece r is sent out, and is in a contracted state when the workpiece r is cut.

On the other hand, the cutter 20 and the pressure body 30 are
Both are circular rotating bodies, and are arranged in a state of being orthogonal to the axis of the workpiece r, and are detachable and rotatable adjacent to the holders 40 that move up and down by a toggle device, hydraulic cylinder, etc. Is attached to.

In particular, the cutter 20 has a diameter larger than that of the pressure body 30, and is positioned in the base end direction of the workpiece r with respect to the pressure body 30.

Further, the receiving roller 50 is provided in the vicinity of the chuck 10, and its rotating shaft 52 is rotatably supported by a bracket 54 fixed to the cutting machine body.

FIG. 2 is a diagram showing that part,
0 is a receiving roller, 52 and 52 are rotating shafts, r is a workpiece,
12 is a collet chuck.

As is apparent from this figure, the receiving rollers 50, 50 are meshing rollers provided with grooves, and support the lower surface of the workpiece r protruding from the collet chuck 12 at the meshing portions.

Next, a method for cutting the workpiece r will be described in detail based on the cutting machine configured as described above.

FIGS. 3 (a) to 5 (i) sequentially show the state in which the work piece is cut, and r is the work piece.

The cutter 20, the pressing body 30, and the air cylinder 60 are initially in the state shown in FIG. 3 (a). From this state, the main shaft 14 of the chuck 10 is rotated first, and as shown in FIG. 3 (b). The movable shaft 60 is extended.

Then, as shown in FIG. 3 (c), the rear end of the workpiece r is pressed by the air cylinder 61 until the tip of the workpiece r abuts the movable shaft 60 in the extended state. Send out.

When the workpiece r is fed out by a predetermined length in this way, the movable shaft 60 is contracted and the air cylinder 62 located behind the chuck 10 is extended to expand the collet cap as shown in FIG. 4 (d). 16 tip 16
A is pressed, and the workpiece r is clamped and held by the collet chuck 12.

Next, as shown in FIG.
As shown in (e), the cutter 20 and the pressing body 30 are lowered.

Then, since the diameter of the cutter 20 is larger than that of the pressurizing body 30, the cutter 20 first comes into contact with the workpiece r and the cutter 20 cuts the workpiece r. ), The notch groove m is formed on the peripheral surface thereof, and thereafter the pressing of the tip of the workpiece r by the pressing body 30 is started.

When the tip of the workpiece r is pressed by the pressurizing body 30, the stress generated in the workpiece r is concentrated in the notch groove m (stress concentration), and the workpiece r is eventually removed from the notch groove m as shown in FIG. It fractures as shown in (g) and (h).

When the workpiece r is cut, the cutter 20 and the pressurizing body 30 are raised as shown in FIG. 5 (i), and the above steps are repeated to sequentially cut the workpiece r.

In addition, according to the above-mentioned embodiment, the lower surface of the workpiece r sent out is supported by the receiving rollers 50, 50, but this may be described below.

For example, the receiving rollers 50, 50 may not be meshing rollers but may be a pair of rollers that are in close proximity to each other, or may be eliminated in some cases.

That is, if the ratio of the diameters of the cutter 20 and the pressurizing body 30 is increased and the cutting amount by the cutter 20 is increased, the pressing force of the workpiece r by the pressurizing body 30 can be reduced. It is also possible to cut while the workpiece r is supported only by the chuck 10.

Further, according to the above embodiment, the cutter 20
The pressurizing body 30 and the pressurizing body 30 are attached to the holder 40 and simultaneously descend from above, but the cutter 20 is installed on the side of the workpiece r and the pressurizing body 30 is installed above the workpiece r. Alternatively, the cutter 20 may be advanced toward the workpiece r, and then the pressure body 30 may be lowered.

Further, the mechanism for feeding the workpiece r is not limited to the use of the air cylinder 61, but it is driven by a table which moves by a predetermined amount, for example, a slide table which travels by a feed screw or a pulse motor. The base end of the work piece r may be attached to a table that is fixed to the chain, and the work piece r may be sent out by a predetermined length by the table.

Further, the movable shaft 60 is not limited to an air cylinder, but may be a solenoid or the like, or may be a fixed object such as a metal block fixed to a simple cutting machine.

Of course, if a table or the like that moves by a predetermined amount as described above is used as the mechanism for delivering the workpiece r, the movable shaft 60 is unnecessary.

Further, according to the above embodiment, the cutter 20
The pressurizing body 30 has a circular shape, but the shape is not limited, and it goes without saying that it may have a plate shape.

[0050]

Since the method for cutting a workpiece and the apparatus therefor according to the present invention are as described above, the following effects can be obtained.

(1) Processing is performed by rotating a workpiece sequentially delivered by a predetermined length, forming a notch groove in the delivered workpiece, and cutting the workpiece by pressing the front end from the notch groove. Since the cut surface of the object becomes orthogonal to its axis, the cut-off processed product, that is, the material is a beautiful shape, and when it is swallowed or extruded, the material does not fit into the mold or the molded product It has an excellent effect that uneven thickness does not occur.

(2) Further, since the notch groove is formed in the workpiece and the front end is pressed against the notch groove to cut the workpiece, there is an excellent effect that rapid cutting is possible.

(3) Further, it is provided with a chuck for rotating and holding the workpiece, a cutter for cutting the workpiece sent out, and a pressing body for pressing the tip of the workpiece to cut the workpiece from the cut portion. With such a cutting machine, there is an excellent effect that the workpiece can be quickly cut with the cutting surface being orthogonal to the axis thereof.

(4) Further, since the cutter is cut into the rotating workpiece, a notch groove is formed on the peripheral surface of the workpiece, and the front end of the notch groove is pressed by the pressurizing body. It has an excellent effect that the workpiece can be cut without requiring a pressing force.

(5) Further, a receiving roller which is arranged in the vicinity of the chuck and supports the lower surface of the delivered workpiece, and a forward / backward movement which is arranged in the longitudinal direction of the workpiece and positions the delivered workpiece at a predetermined position. Since the cutting machine is provided with a movable shaft that can be cut, the workpiece to be cut can be supported, the workpiece can be easily positioned, and the movable shaft does not hinder the cutting. Produce an effect.

(6) Further, the advent of the method for cutting a workpiece and the apparatus therefor according to the present invention has an excellent effect that it greatly contributes to machining of mechanical parts such as cold forging.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a main part of a cutting machine according to the present invention.

FIG. 2 is a perspective view showing a receiving roller portion of the cutting machine.

3A to 3C are cutting process diagrams of the present invention.

4 (d) to (f) are cutting process diagrams of the present invention.

5 (g) to (i) are cutting process diagrams of the present invention.

FIG. 6A is an explanatory view showing a conventional method for cutting a work piece, and FIG. 6B is a front view showing the cut work piece.

[Explanation of symbols]

 r Workpiece 10 Chuck 12 Collet chuck 14 Spindle 16 Collet cap 20 Cutter 30 Pressurizing body 50 Receiving roller 60 Movable shaft

Claims (3)

[Claims] 1. A method of rotating a workpiece sequentially delivered by a predetermined length to form a notch groove in the delivered workpiece, and cutting the workpiece by pressing a front end of the notch groove. How to cut a work piece. 2. A cutting machine for sequentially feeding and cutting a workpiece in its longitudinal direction, a chuck for rotating and holding the workpiece, a cutter for cutting the fed workpiece, and a tip of the workpiece being pressed. A cutting machine, comprising: a pressing body that cuts a workpiece from the cut portion. 3. A receiving roller which is arranged near the chuck and supports a lower surface of the delivered work piece, and a movable back and forth which is arranged in the longitudinal direction of the work piece and positions the delivered work piece at a predetermined position. The cutting machine according to claim 2, further comprising a shaft.