JPH0763891B2 - Disc cutter substrate molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention attaches a large number of blades to the outer periphery of a disk-shaped substrate, and rotates the blade to process a workpiece such as wood-based material, synthetic resin or inorganic material. The present invention relates to a disk cutter for cutting a substrate, and more particularly to a method for forming the substrate.

(Conventional Technology) As a conventional technology, there is a molding method shown in FIGS. 7 to 14.

First, a raw steel sheet (commercial product) made of carbon steel (SK) or carbon tool steel (SKS) that has not been subjected to quenching treatment and surface finishing is cut by a press machine into a square shape as shown in FIG. The plate material 1 is formed.

Then, as shown in FIG. 8, a lower hole 2a is formed in the central portion of the plate material 1 by a press machine or a drilling machine to form a first intermediate substrate A1.

Then, the outer peripheral portion of the first intermediate substrate A1 is cut into a circular shape by a pressing machine to form a doughnut-shaped second intermediate substrate A2 as shown in FIG.

Next, after quenching and tempering the second intermediate substrate A2 to heat it to a predetermined hardness, the prepared hole 2a is finished by a lathe and a honing machine to a predetermined inner diameter and surface accuracy, and as shown in FIG. Then, a doughnut-shaped third intermediate substrate A3 having the mounting hole 2 at the center is formed.

Next, the outer peripheral portion of the third intermediate substrate A3 is cut by a laser beam in a sawtooth shape to form a fourth intermediate substrate A4 having the blade rest 3 on the outer peripheral portion, as shown in FIG.

Then, rough grinding of both sides by a surface grinder, bending of the middle part 4 by roll pressure, and adjustment of distortion such as bending by a hammer are sequentially performed, and then both surfaces are finished ground by a surface grinder to give a predetermined plate thickness. After adjusting the strain again with a hammer, as shown in FIG. 12, six small holes 5, for example, are formed on the outer peripheral portion at equal pitches by a drilling machine to form a fifth intermediate substrate A5.

Then, after chamfering both ends of each of the small holes 5, a plug body 6 made of copper or aluminum alloy is fitted into each of the small holes 5 as shown in FIG. 13 and caulked to fix the sixth intermediate substrate A6. Form.

Next, from the outer periphery of the sixth intermediate substrate A6 toward each small hole 5,
Slits 7 are formed as shown in FIG. 14, thereby completing the substrate A of the disc cutter.

(Problems to be Solved by the Invention) Conventionally, a plate material made of a raw copper plate has been formed by using various types of cutting machines and heat treatment apparatuses. In addition, the latest processing methods such as laser processing were also adopted in that process, but since the processing process itself was conventional, it still required many steps and only a slight improvement in productivity. However, the introduction of expensive equipment, on the contrary, caused a problem of increasing the production cost.

An object of the present invention is to obtain a novel disk cutter substrate forming method that solves the above drawbacks.

(Means for Solving the Problems) The present invention is configured as follows in order to achieve the above object.

As a plate material, a steel plate material that has been processed to a specified hardness and surface-finished to a specified thickness is used.This plate material is melted by a laser beam, and a large number of blades are attached to the outer periphery, and a mounting hole is formed in the center. A disk-shaped substrate having a plurality of elongated holes in the peripheral portion is formed, and each elongated hole extends in a substantially radial direction,
In this structure, the cross-sectional area of both ends in the longitudinal direction is made narrow and the cross-sectional area of the intermediate portion in the longitudinal direction is made wide, and then finishing processing of the inner diameter of the mounting hole and chamfering of each melting edge portion are performed.

Further, when the long holes are formed in the middle portion of the area of about 88% to 50% of the effective diameter of the substrate, and the middle portion of the long holes located near about 70% of the effective diameter of the substrate is formed wide. It is effective.

(Operation) Since the present invention has the above-mentioned configuration, the plate material is quickly melted by the laser beam with a groove width of a small cross-sectional area and formed into a predetermined shape without exposing the surroundings to high heat. become.

For this reason, in the process of manufacturing a circular saw substrate, the process of using a conventional machine such as a press or a lathe is replaced with laser beam processing in the process of forming a blade base, attaching holes, and punching long holes.

In addition, the outer peripheral portion and the inner peripheral portion of the substrate are circumferentially divided into the outer peripheral portion and the inner peripheral portion by the small area portion of the long hole, and the middle portion is divided by the wide area portion of the long hole in the circumferential direction. The bending rigidity of the portion does not decrease so much, and the internal strain and the like due to the temperature rise during cutting are mainly absorbed by the longitudinal intermediate portion of the slot.

(Examples) Examples of the present invention will be described below with reference to the drawings.

In the drawings, FIG. 1 is a plan view of a steel plate material showing an embodiment of the present invention, FIG. 2 is a side sectional view showing its working state, and FIG.
6 to 6 are plan views showing an example of the processing sequence.

First, from steel plate material (commercially available) made of carbon steel (SK), carbon tool steel (SKS) or stainless steel (SUS) that has been hardened or cold rolled to achieve hardness HV410 to 500 and thickness accuracy of ± 0.02. As shown in FIG. 1, a square plate material 10 is formed.

Then, as shown in FIG.
It is placed horizontally along the upper surface of the table 12 via the, and is cut into a predetermined shape by the carbon gas laser processing machine 14 which is driven and controlled in the XY axis directions by the NC control device 13.

The carbon dioxide laser processing machine 14 has an electrode 14 for irradiating a laser beam (a) according to a command from the NC control device 13 in which a predetermined program is input in advance.
By operating a in the XY-axis direction in a predetermined order, a substrate B having a tooth base 15, an elongated hole 16, a slit 17 and a mounting hole 18 is formed as shown in FIG.

In this example, the tooth holder 15, the elongated hole 16, the slit 17, and the mounting hole 18 are formed in the following sequence of operations.

First, while irradiating a laser beam (a) from the electrode 14a and repeatedly operating the electrode 14a in a saw-tooth shape, the outer peripheral portion of the plate material 10 is melted by making a round in a circumferential direction with a large radius. As shown in FIG. 3, a first intermediate substrate B1 having a toothed tooth base 15 on the outer periphery is formed.

Next, the electrode 14a is circulated in the circumferential direction at a predetermined pitch in a substantially radial direction and in a crescent shape to melt the middle portion of the first intermediate substrate B1, and as shown in FIG. Second four holes 16 are formed at equal intervals in the circumferential direction such that the cross-sectional area at both ends in the direction is narrow and the cross-sectional area at the intermediate portion in the longitudinal direction is wide.
The intermediate substrate B2 is formed.

In this case, the long hole 16 has a diameter of about 1 mm of the effective diameter of the first intermediate substrate B1.
The width of the intermediate portion 16a located at about 70% of the effective diameter of the first intermediate substrate B1 (the root diameter of the tooth base 15) is formed in the middle portion of the 88% to 50% region so that the maximum width is obtained. Form.

Next, the electrodes 14a are moved circumferentially at equal pitches in a spiral manner from the base portion (root portion) of the tooth base 15 in the axial direction and at the axial end portion side to form an outer peripheral portion of the second intermediate substrate B2. After fusing and extending in the axial direction between the long holes 16 and 16, as shown in FIG. 5, a third intermediate substrate B3 having four spirally curved slits 17 is formed.

Next, the electrode 14a is swung with a small radius at the center of the third intermediate substrate B3 to melt the center, and a mounting hole 18 is formed at the center of the third intermediate substrate B3 as shown in FIG. After forming
Each of the above-mentioned fusing parts is chamfered, and then slightly bent and corrected, whereby the substrate B of the disc cutter is completed.

(Effects of the Invention) As is apparent from the above description, the present invention provides a plate material made of a steel plate material that has been processed and surface-finished to have a predetermined hardness and thickness, and melts the plate material with a laser beam, Since the blade base, the mounting hole and the long hole are formed, the blade base, the mounting hole and the long hole can be easily formed even with a hard plate material, and at the same time, these can be formed by one laser. It can be formed by a series of operations by the processing machine.

In addition, the substrate has a plurality of elongated holes in the circumferential direction, which extend substantially in the radial direction and have a narrow cross-sectional area at both ends in the longitudinal direction and a wide cross-sectional area at the intermediate portion in the longitudinal direction. As a result, the bending rigidity of the outer and inner peripheral portions of the substrate does not decrease so much, and the internal strain due to the temperature rise during cutting is mainly absorbed by the longitudinal intermediate portion of the slot. Therefore, it is not necessary to perform the waist insertion process.

Therefore, the present invention has the effects of reducing man-hours and types of processing machines, increasing productivity, and reducing equipment costs.

[Brief description of drawings]

FIG. 1 is a plan view of a steel sheet material showing an embodiment of the present invention, FIG. 2 is a side sectional view showing a processing state thereof, and FIGS. 3 to 6 are plan views showing an example of the processing sequence thereof. FIG. 14 to FIG. 14 are process drawings showing the conventional main processing steps. B: substrate, B1 to B3: first to third intermediate substrate, 15: tooth base, 16: long hole, 16a: intermediate portion, 17: slit, 18: mounting hole, (A):
Laser beam.

Claims (2)

[Claims] 1. A plate material used is a steel plate material which has been processed to have a predetermined hardness and surface-finished to have a predetermined thickness, and the plate material is fused by a laser beam to provide a large number of blades on the outer periphery.
A disk-shaped substrate having a mounting hole in the center and a plurality of elongated holes in the middle portion is formed, and each elongated hole extends in a substantially radial direction and has a narrow cross-sectional area at both ends in the longitudinal direction. A method for forming a substrate of a disk cutter, characterized in that a wide sectional area is formed at an intermediate portion in the longitudinal direction, and then finishing processing of the inner diameter of the mounting hole and chamfering processing of each fusing edge portion are performed. 2. The elongated holes are about 88% to 50% of the effective diameter of the substrate.
Formed in the middle part of the area, and about 70% of the effective diameter of the substrate
A method for forming a substrate of a disk cutter, characterized in that the middle portion of the long holes located in the vicinity is formed wide.