JPS591529B2 - Cutting method and device for bar-shaped workpieces - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for cutting a bar-shaped workpiece by shearing force.

Conventionally, in order to cut a rod-shaped workpiece by shearing action, the workpiece is supported and fixed by some type of tool, and the upper blade and the lower blade are engaged with each other to cut the workpiece.

This is done using the so-called guillotine method. However, in the case of thick rod-shaped objects, this method has problems such as high working noise, deterioration of the working environment, and poor working accuracy due to slanted cutting surfaces.

Taking the above points into consideration, the present invention is designed to form a groove in advance all around the outer surface of the workpiece at the part that will become the cutting surface, and apply shearing force with a movable blade biting into the entire circumference of this groove. and
The purpose is to cut with low noise, high speed, and precision.

That is, in the method of the present invention, the workpiece is supported by the fixed blade by bringing the cutting edge of the fixed blade into contact with the entire outer circumference of the bar-shaped workpiece, and the cutting edge of the movable blade that slides against the fixed blade is fixed. A groove is formed along the entire circumference along the contact line of the cutting edge of the blade, and the movable blade is moved in the grooved state, and the workpiece is cut using the groove as a cutting line by shearing force. It is composed of

Various types of devices can be used to carry out the above method, and one embodiment thereof will be described with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, this embodiment consists of a fixed blade 1 that supports a workpiece A, and a movable blade 2 whose cutting edge is in sliding contact with this fixed blade 1. is workpiece A
The cutting edges of both blades 1 and 2 are made to be in almost the same shape as the outer circumferential edge of the cross section of the workpiece A, and
The movable blade 2 is divided into two parts, and each blade 2a, 2b is movable along the fixed blade 1 by separate hydraulic cylinders 3, 4, and the inner hydraulic cylinders 3, 4 are operated by one hydraulic pump (Fig. (not shown), and the diameter of one hydraulic cylinder 3 is set larger than the diameter of the other hydraulic cylinder 4.

In the figure, since the cross-sectional shape of workpiece A is circular, the shape of the cutting edge of blades 1 and 2 is also circular, but the shape of the cutting edge is not limited to circular, and the shape of the cutting edge of workpiece A is circular. Of course, the cross-sectional shape may be made to correspond to a rectangular shape, for example.

The fixed blade 1 is fixed to a fixed blade stand 6 fixed to the machine body 5,
- The 10,000 (upper) movable blade 2a is fixed to one hydraulic cylinder 30 rond, and the other (lower) movable blade 2b is fixed to the other hydraulic cylinder 40 rond via movable blade stands 7a and 7b, respectively.

An adjusting screw 8 that comes into contact with the upper surface of the workpiece A is screwed into the fixed blade stand 6, and during cutting, which will be described later, the tip of the screw 8 is brought into contact with the workpiece A to adjust the workpiece during cutting. Prevents workpiece A from flying up.

The upper and lower movable blade stands 7a, 7bK are also screwed with adjustment screws 9a, 9b that come into contact with the upper and lower surfaces of the workpiece A, and these screws 9a, 9b are connected to the movable blades (described later). When the cutting edges of the blades a and 7b bite into the workpiece A (the state shown in FIG. 6), the tips are set so as to abut and support the upper and lower surfaces of the workpiece A.

As shown in FIG. 3, when the movable blade 2 grips the workpiece A with its cutting edge, the cutting edge digs in and forms a groove 10 around the entire outer surface of the workpiece A. is set appropriately depending on the material, thickness, etc. of the workpiece A.

Further, the fixed blade 1 can also have a chuck structure consisting of side blades.

The above embodiment is constructed as described above, and its operation will be explained next.

Now, as shown in FIGS. 1 and 2, when the workpiece A is fully supported by the fixed blade 1, when oil is supplied to the cylinder sides of both hydraulic cylinders 3 and 4 by the hydraulic pump, the upper and lower movable blades 2a, 2b begins to approach.

At this time, since the diameter of the -10,000 (upper) hydraulic cylinder 3 is set larger than the diameter of the other (lower) hydraulic cylinder 4, the lower hydraulic cylinder 40 advances faster than the upper one, as shown in FIG. As shown in FIG. 6, the lower movable blade 2b comes into contact with the workpiece A first, and then, as shown in FIG. 6, the upper movable blade 2a also comes into contact with the workpiece A.
4, the movable blades 2a and 2b will move toward the workpiece A.
As shown in FIG. 7, the workpiece A is sheared off using the groove 10 as a cutting line.

At this time, since the diameters of both cylinders 3 and 4 are different, the one with the smaller diameter is sheared, but the difference in diameter depends on the shearing speed, the material and thickness of the workpiece A, etc. Please consider and select appropriately.

For example, workpiece A is a steel samurai with a diameter of 50rrtm, around 5S41, and the pressure of one hydraulic cylinder 3 is 100 tons.
The pressure in the other hydraulic cylinder 4 is set to 15).

After cutting, by refueling the rond sides of both cylinders 3 and 4 and separating both rotary blades 2a and 2b, the adjustment screws 9a and 9b will also separate from the workpiece A at the same time, allowing the cutting to be completed as shown in Figure 8. Workpiece A falls.

Thereafter, by pushing out the workpiece A supported by the fixed blade 1 by a desired amount and repeating the above operation, the workpiece A of the required length can be obtained.

In the above embodiment, the workpiece A was supported by the adjustment screws 9a and 9b, but if the workpiece A to be cut is short, the movable blades 2a and 2b are supported as shown in FIG. A catch 11 may be formed and the workpiece A may be received by the catch as shown by the chain line in the figure.

Further, in the above embodiment, the movable blade 2 continuously bites into and cuts the workpiece A, but it is also possible to cut the workpiece A using hydraulic pressure or the like after the movable blade 2 bites into the workpiece A using a screw mechanism. That is fine, and the cuts may be made in any number of ways.

In short, any structure that can accomplish this method is fine.

As described above, according to the present invention, a cutting groove is formed in advance on the entire outer surface of the workpiece, and the movable blade and the fixed blade sandwich the entire outer surface of the workpiece with the groove as a boundary and in contact with each other, and the state Since the movable blade is moved to perform cutting using shearing force, the cutting surface is formed along the grooves, allowing for highly accurate cutting, and allows for smooth and low-noise work even on thick workpieces. There is an effect that can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a cut front view of an embodiment of the cutting method of the present invention;
Fig. 2 is a left side view of Fig. 1, Fig. 3 is an enlarged view of the movable blade in pressure contact state in Fig. 2, Figs. FIG. 2 is an enlarged front view of main parts of the embodiment. A... Workpiece, 1... Fixed blade, 2.
...Movable blade, 3.4...Hydraulic cylinder.

Claims (1)

[Scope of Claims] 1. The workpiece is supported by the fixed blade by bringing the cutting edge of the fixed blade into contact with the entire outer circumference of the bar-shaped workpiece, and the cutting edge of the movable blade that slides against the fixed blade is brought into contact with the workpiece. A groove is formed by biting into the object along the entire circumference along the line of contact with the cutting edge of the fixed blade, and the movable blade is moved while it is biting into the object, and the groove is used as a cutting line by shearing force to cut the workpiece. A method for cutting a rod-shaped workpiece, which is characterized by cutting an object. 2 A device for cutting a bar-shaped workpiece, which consists of a fixed blade that supports the workpiece and a movable blade whose cutting edge slides into contact with the fixed blade, and the cutting edge of both blades has a shape that is almost the same as the cross-sectional outer circumference of the workpiece. The cutting edge of both blades is in contact with the outer circumference of the workpiece, and the movable blade is divided into two parts, each of which can be moved along the fixed blade by a separate hydraulic cylinder, and the internal hydraulic A cutting device for a rod-shaped workpiece, characterized in that the cylinders are connected to one hydraulic pump, and the diameter of one hydraulic cylinder is set larger than the diameter of the other hydraulic cylinder.