JP2008119829A - Work cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device for accurately cutting a bar-shaped workpiece finished to a predetermined dimension at low cost.
A mounting plate 8 is replaceably attached to a table 7, and clamp portions 3 and 3 are provided at the tip of a piston rod of a clamp cylinder to sandwich and clamp both sides of a workpiece 1 placed on the mounting plate. A plurality of diamond cutters 4, 4... Are attached to a main shaft 5 that is rotated by a drive motor 15, and the drive motor 15 attaches the diamond cutters 4, 4. The structure can be moved up and down while rotating.
[Selection] Figure 4

Description

  The present invention relates to a cutting device for cutting a relatively long and narrow workpiece.

  Work that has been finished to the specified dimensions in length, width, and height is cut into multiple thin square bars. In this case, the work is a tray made of carbon or ceramic (cradle). Glued and fixed to. That is, the workpiece bottom surface is fixed to the tray, and in this state, the tray is positioned on the table surface of the cutting machine, and cutting is performed. By the way, when the workpiece is bonded and fixed to the tray, the tray and the workpiece are placed on a hot plate and heated, and an adhesive (wax) is applied to the bonding surface to position and fix the workpiece on the upper surface of the tray.

  At this time, the positioning accuracy of the workpiece is affected by the force applied to the workpiece, the wax coating method, and the wax coating thickness. The tray on which the workpiece is fixed is positioned and fixed on the magnet table, but a special jig is required to fix the ceramic tray or the like on which the magnet does not work on the table surface. In addition, since a magnetic table cannot be used for a work that dislikes magnetism, a positioning / fixing method using a jig is employed.

  And after a workpiece | work is cut | disconnected, it must remove from a tray, and it heats to high temperature for that purpose, and wax is wash | cleaned from the cut | disconnected member. On the other hand, when the workpiece is fixed to the tray and cut, a cutter cutting groove is also formed on the tray surface, the life of the tray is short, and it is necessary to frequently replace it with a new tray. As described above, the conventional cutting process requires a pre-processing step and a post-processing step after processing, which increases costs.

  Also, when performing a cutting process for finely cutting a thin rod-shaped workpiece, the rod-shaped workpiece can be bonded and fixed to the tray and cut together with the tray. However, if it is an inefficient square bar with a flat surface that adheres, it can be bonded and fixed to the tray, but it is a rod-shaped workpiece with a curved side surface such as a round bar or an elliptical bar. In this case, it cannot be bonded or fixed to the tray surface.

  Many small parts are used in computers, copiers, and even household appliances. These small parts are machined in a variety of ways, most of which are plastic, but some are machined. The cutting process targeted by the present invention is one of them and is not intended for a specific part, but it is desired to cut a previously processed rod-shaped workpiece efficiently with high accuracy. .

  Thus, the conventional cutting process has the above problems. The problems to be solved by the present invention are these problems, and can be cut with high accuracy and efficiency in a state where the rod-shaped workpiece is sandwiched between both clamps without bonding and fixing the rod-shaped workpiece to the tray. A cutting device is provided.

  The cutting device of the present invention is configured to cut a rod-shaped workpiece finished to a predetermined size, and a plurality of disk cutters attached to the main shaft are arranged at the center, and the disk cutters move up and down. I can do it. That is, when the disk cutter descends while rotating at high speed, the workpiece fixed to the table is cut into pieces and cut into pieces. The work is fixed on a table mounting plate, but clampers are provided on both sides and clamped in place. However, it is also possible to raise the table which clamps a workpiece | work, without the said disk cutter falling.

  Each clamper is provided with a clamp portion that directly contacts the workpiece, and the clamp portion can be replaced according to the shape of the workpiece. In addition, the work is cut by a disk cutter, but a part of the clamp part is also cut at the same time, so that the mounting structure can be replaced at an appropriate time. And it is provided with the supply apparatus for supplying a workpiece | work and clamping with both clampers, and the discharge means which discharge | emits the piece cut | disconnected finely.

  And the cutting | disconnection of this invention is performed by the disk cutter which descends from the upper part the workpiece | work fixed on the mounting plate of a table in a clamp part, or is performed by raising a table. Therefore, a deep load is applied to the drive motor due to the deep cutting, and the disk cutter is also deformed. Since this adversely affects the cutting accuracy, the feed speed of the disk cutter or the feed speed of the table is controlled so that the current that drives the drive motor is detected and the load does not increase beyond a certain level.

  In this way, in the present invention, the work can be clamped by both clampers, and the work can be finely cut, and it is not necessary to adhere and fix the work to the tray as in the prior art, and the cutting work can be performed efficiently I can do it. The cross-sectional shape of the workpiece is not limited to a quadrangle, and even a workpiece having a curved side surface such as a circle or an ellipse can be correctly clamped and cut by attaching a clamp portion having an appropriate shape.

  Therefore, cutting can be efficiently performed as compared with a conventional method of bonding and fixing to a tray, and preparation work and post-processing work are unnecessary. For this reason, the number of work steps required for cutting is extremely reduced, and the workpiece to be cut becomes cheap. In addition, high-accuracy cutting can be performed efficiently without the amount of wax applied or the coating method being affected by the cutting accuracy.

  And in this invention, since the electric current which drives a drive motor is detected and the cutting load is made not to become larger than fixed, the thermal deformation based on the deformation | transformation and heat_generation | fever of a disk cutter can be suppressed. For this reason, the workpiece cutting accuracy is increased and the life of the disk cutter is extended.

  FIG. 1 shows workpieces 1a and 1b targeted by the present invention. A workpiece 1a shown in FIG. 1A is a bar having a square cross section, one side of which is 10 mm and a length of 20 mm to 50 mm. The bar workpiece 1a is cut into portions indicated by dotted lines and cut into small pieces 2a, 2a,. The workpiece 1b shown in (b) is a rod having a circular cross section, the diameter is 10 mm, the length is 20 mm to 50 mm, and the portion indicated by the dotted line is cut into a plurality of fine pieces 2b, 2b,. Is done.

  When the thin bar workpieces 1a, 1b are cut into smaller pieces 2a, 2a,..., 2b, 2b,. And it cut | disconnects with a some disk shaped diamond cutter in the clamped state. FIG. 2 shows a state in which the workpiece 1a is clamped. The side surface of the workpiece 1a is clamped and fixed by the clamp portions 3 and 3.

  A diamond cutter 4 is disposed above the workpiece 1a, and the diamond cutter 4 rotates at a high speed and descends. Therefore, the work 1a is finely cut by the diamond cutters 4, 4,. The diamond cutter 4 is attached to the main shaft 5, and in this case, the workpiece 1a is cut into a plurality of pieces 2a, 2a,... At a time by attaching a plurality of diamond cutters 4, 4,. Here, in the case of a bar having a rectangular cross section with the lateral dimension of the workpiece 1a being increased to 30 mm, 40 mm,... In this case, the table or diamond cutter 4 to which the workpiece 1a is attached can be moved horizontally.

Hereinafter, the cutting method of the present invention will be described.
(1) Supply of workpiece The workpiece 1 is supplied to a table provided below the diamond cutter 4. Here, the specific supply method to the table is not limited. For example, the supply method shown in FIG. 3 sandwiches both side surfaces 6 and 6 of the work 1 and moves in the direction of the arrow that is directly below the diamond cutter 4. The workpiece 1 moved to a predetermined position as shown in (b) is kept in a sandwiched state. Then, as shown in (c), the piston rods 9, 9 extend from both sides, and the workpiece 1 is clamped. Here, a mounting plate 8 is fixed in the center of the table, and the workpiece 1 to be supplied is mounted on the mounting plate 8.
(2) At the tips of the clamp piston rods 9 and 9, attachment portions 10 and 10 are attached, and clamp portions 3 and 3 for directly gripping the workpiece 1 are fixed to the attachment portions 10 and 10, respectively. Since the height of the clamp portions 3 and 3 is lower than that of the workpiece 1, the workpiece 1 is clamped and fixed so that the clamper of the supply device does not get in the way. When the clamps 3 and 3 are clamped, the clamp of the supply device is released, and the workpiece 1 is placed on the mounting plate 8 and fixed immediately below the diamond cutter 4 as shown in FIG.
(3) Cutting The workpiece 1 clamped as shown in FIG. 3C is cut by the diamond cutter 4 shown in FIG. The diamond cutter 4 descends while rotating at a high speed, and the workpiece 1 is cut as the diamond cutter 4 descends. At this time, the diamond carter 4 is cut into a part of both the clamp portions 3 and 3 that clamp the work 1, and the surface of the mounting plate 8 attached to the table 7 is also cut partially. The face is never cut.

The workpiece 1 is cut by the diamond cutter 4 of the present invention descending right below while rotating, but the cutting accuracy is increased. That is, when the workpiece fixed to the table is moved horizontally with respect to the diamond cutter 4 at a fixed position, the cutting position is eccentric from the center of the diamond cutter, so that the cutting accuracy is lowered, but the workpiece is lowered and cut down. Therefore, since the cutting part is on the central axis of the diamond cutter, high cutting accuracy can be obtained.
(4) When the cutting of the discharge workpiece 1 is completed, the diamond cutter 4 is raised, and the cut pieces 2, 2,... Are discharged at the same time as the clamp is released.
Of course, there are discharging means. For example, the clamper used at the time of supply can be clamped again and discharged, or the piece placed on the table mounting plate 8 after releasing the clamp can be discharged out of the table by the pusher. It becomes possible.

  FIG. 4, FIG. 5 and FIG. 6 are examples showing the appearance of the cutting device according to the present invention. In the figure, 1 is a workpiece, 4 is a disk-shaped diamond cutter, 3 is a clamp part, and 11 and 12 are clamp cylinders. The main body frame 14 of the cutting device includes a drive motor 15, and a plurality of diamond cutters 4, 4... Are attached to the main shaft 5 of the drive motor 15.

  A table frame 16 is attached to the upper front side of the main body frame 14, and a table 7 is provided at the upper end of the table frame 16. The table 7 of the cutting apparatus shown in the figure has a structure that is fixed at a fixed position, and the drive motor 15 can move up and down. That is, the diamond cutter 4 is lowered while rotating and the workpiece 1 clamped directly below is cut.

  On the other hand, instead of lowering the drive motor 15, the table 7 can be raised, and the workpiece 1 can be cut by raising the table 7 with respect to the diamond cutter 4 rotating at a fixed position. In any case, the workpiece 1 is clamped as shown in FIG.

  As is apparent from the front view shown in FIG. 4, clamp cylinders 11 and 12 are provided on both sides, and the work 1 is slid by pressing from the front with a pusher of the supply device, and abuts against a stopper provided at the rear. In this state, the clamp cylinders 11 and 12 on both sides operate and the workpiece 1 is clamped by the clamp portions 3 and 3. The diamond cutter 4 rotates at a high speed by the drive motor 15 and descends downward, and the workpiece 1 is cut finely. Since the mounting plate 8 is attached to the table 7, a part of the mounting plate 8 is cut by the diamond cutter 4, but the workpiece 1 can be cut without scratching the table surface.

  Since the workpiece 1 is firmly clamped by the clamp portions 3 and 3, the workpiece 1 is accurately cut to a predetermined dimension. Then, the cut pieces 2, 2... Are discharged from the table by the discharge means, and another workpiece 1 is supplied again. Here, the discharging means is not particularly limited, but the most general method can be picked up by a robot arm.

  FIG. 7 shows a case where the workpiece 1 having a circular cross section is clamped to the clamp portions 3 and 3. Since the workpiece 1 is a rod having a circular cross section, the tip surfaces of the clamp portions 3 and 3 are V-shaped, and the workpiece 1 is fixed without being displaced. The clamp portion 3 is attached to an attachment portion 10 provided at the tip of the piston rod of the clamp cylinders 11 and 12. There are various mounting structures, but screws and adhesives are used.

  When the workpiece 1 is cut with the diamond cutter 4, a part of the clamp portions 3 and 3 fixing the workpiece 1 is also cut to form a cut groove. Similarly, the surface of the mounting plate 8 on which the workpiece 1 is mounted is also cut. Therefore, the clamp parts 3 and 3 and the mounting plate 8 must be periodically replaced. For this purpose, an attachment structure that can be easily attached to and detached from the attachment portion 10 and the table 7 is adopted. Here, the material of the clamp part 3 and the mounting plate 8 is a material that does not cause a decrease in the positioning accuracy of the workpiece 1 when the material is clamped with a material that has little influence on the life of the diamond cutter 4, such as carbon.

  In this way, the workpiece 1 clamped between the clamp portions 3 and 3 is cut by a diamond cutter that descends while rotating. At the start of cutting, the cutting area with the workpiece 1 is slight, but it expands as it descends, resulting in an increase in cutting resistance. Due to the increase in cutting resistance, the very thin diamond cutter 4 is deformed and the heat generation also increases. As a result, the cutting accuracy of the workpiece 1 is lowered.

  In the present invention, the cutting resistance is controlled so as not to increase beyond a certain level. That is, since an increase in cutting resistance causes an increase in current necessary for the drive motor 15 to rotate, the cutting speed (lowering speed) of the diamond cutter 4 can be controlled so that the current does not exceed a certain level.

The work shape cut | disconnected with the cutting device which concerns on this invention. When cutting a clamped workpiece. The process of setting the work on the table. The front view of a cutting device. The top view of a cutting device. The side view of a cutting device. When clamping a workpiece with a circular cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work 2 Piece 3 Clamp part 4 Diamond cutter 5 Spindle 6 Side 7 Table 8 Mounting plate 9 Piston rod
10 Attachment
11 Clamp cylinder
12 Clamp cylinder
14 Body frame
15 Drive motor
16 Table frame

Claims (4)

In a cutting device that cuts a rod-shaped workpiece finished to a predetermined size, a mounting plate is replaceably attached to a table, and clamps are clamped by clamping both sides of the workpiece placed on the mounting plate. Removably attached to the mounting part provided at the tip of the piston rod, multiple disk cutters are attached to the main shaft that is rotated by the drive motor, and the drive motor has a structure that can move up and down while rotating the disk cutter. A workpiece cutting device. In a cutting device that cuts a rod-shaped workpiece finished to a predetermined size, a mounting plate is replaceably attached to a table, and clamps are clamped by clamping both sides of the workpiece placed on the mounting plate. Removably attached to the mounting part provided at the tip of the piston rod, multiple disc cutters are attached to the main spindle that is rotated by the drive motor, and the workpiece clamped by the disc cutter that is rotated by the drive motor is pressed against it. A workpiece cutting device characterized in that the table can be moved up and down so that it can be cut. The workpiece cutting device according to claim 1, wherein a diamond cutter is used as the disk cutter. 4. The workpiece cutting device according to claim 3, wherein carbon is used as a material of the clamp part and the mounting plate so as not to affect the life of the diamond cutter and to prevent deterioration of the positioning accuracy of the workpiece when clamped.

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