JPS63144951A - Control device for cutter - Google Patents

Abstract

PURPOSE:To improve the cutting efficiency and yield by driving and controlling a work moving means so that the pressing force between a blade and a work is made the predetermined quantity in a cutter slicing the hard work into a thin plate shape. CONSTITUTION:A hard work G is fixed on a work table 36, and a blade unit 3s is reciprocated by a motor 41, a drive section 40, and a crank mechanism 39 to slice the work G simultaneously with multiple blades 3 while the work G is intermittently lifted by a work moving means 4. In this case, a controller 33 controls the work G so as to lift it by 1mum, for example, when the blade unit 3s is reciprocated predetermined times, but the pressing force detected by a pressure sensor 37 is increased as the grinding progress, thus the drive of a servo motor unit 27 is controlled so as to obtain the predetermined pressing force. Accordingly, the cutting efficiency and cutting precision is improved, and thereby the yield of the work is also improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a control device for a cutting machine that cuts a workpiece (object to be cut) by reciprocating a plurality of belt-shaped blades.

[Prior art and its problems]

Generally, in a cutting machine that slices hard workpieces such as crystal, sapphire, ceramic, and silicon into thin plates, a large number of belt-shaped blades are arranged in parallel and framed, and the framed blades are driven by a drive device using a crank mechanism. While reciprocating, the workpiece is brought into pressure contact with the blade, and at the same time, a slurry consisting of a mixture of paper powder and water or oil is supplied between the blade and the workpiece to perform cutting.

By the way, in this type of cutting machine, it is necessary to apply a predetermined pressure contact force between the workpiece and the blade, so conventionally, for example, a lever with a weight of a certain size attached to the other end is used to apply a predetermined pressure force to the workpiece. A load of the magnitude was applied.

However, in this method of applying a load, a constant load is constantly applied to the workpiece, so even if an abnormality occurs during cutting, it cannot be dealt with, resulting in problems such as the workpiece being wasted. In addition, if you want to change the load size according to the cutting position of the workpiece, it cannot be easily changed, and the cutting efficiency
It is difficult to optimally set cutting accuracy. Furthermore, since cutting is performed using a combination of blade and slurry,
At the intermediate position of the workpiece, the slurry enters directly under the blade, resulting in a problem in which the cutting ability is reduced.

[Means for solving problems]

The present invention aims to provide a control device for a cutting machine that solves the problems existing in the prior art described above, and is achieved by the control device (1) shown below.

That is, the control device (1) for a cutting machine according to the present invention includes a workpiece moving means (4) that moves the workpiece (G) forward or backward relative to the blade (3) by, for example, step feeding, and a blade (3) and a workpiece (G). G) A pressure contact force detection means (5) for detecting the pressure contact force between The present invention is characterized by comprising a control means (6) for controlling.

[For production]

Next, the operation of the present invention will be explained.

The control device (1) according to the present invention first includes a pressure contact force detection means (
5), the pressure contact force between the workpiece (G) and the blade (3) is detected and applied as a pressure detection value to the control means (6).

On the other hand, the control means (6) constantly monitors the detected pressure value and, for example, when it becomes lower than a predetermined pressure value set in advance, it sends a command to the workpiece moving means (4), and sends a command to, for example, a preset distance The workpiece (G) is advanced by M (approximately Iurn). This advancement is performed until the detected pressure value reaches the predetermined pressure value. Therefore, the blade (3) and the workpiece (
G) A constant load is always applied between. In addition, since the pressure detection value is constantly monitored in this way, if the pressure detection value becomes high and an abnormality occurs, cutting can be immediately stopped.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. Fig. 1 is a block diagram of the main parts of a cutting machine equipped with a control device according to the present invention, Fig. 2 is a cutting position vs. load characteristic diagram when cutting a workpiece with the same cutting machine, and Fig. 3 is a diagram showing the cutting position vs. load characteristic when cutting a workpiece with the same cutting machine. Figure 4 is a front view of a blade suitable for use in the cutting machine; Figure 5 is a sectional view taken along line C-C in Figure 9; 6(a) to 6(C) are partial front views of blades according to other embodiments, FIG. 7 is a perspective view of the blade and a holding block that holds the blade, and FIG. 8 is a frame formed by the holding block. FIG. 9 is a front view of the same holding block with the blade attached, and FIG.
11 is a sectional view taken along the line CC in FIG. 9, and FIG. 12 is a sectional view taken along the line CC in FIG.
It is a sectional view taken along the line CC in the figure.

First, the configuration of a control device (1) according to the present invention will be explained with reference to FIG.

The cutting machine indicated by the symbol (M) in the figure has a built-in control device (1). The workpiece moving means (4) in the control device (1) includes an outer cylinder (22) to which a substrate (21) is integrally attached, and an inner cylinder (23) inserted into the outer cylinder (22) so as to be vertically slidable.
). The outer cylinder (22) has a bottom surface (22a), and a feed screw (25) constituting the ball screw mechanism (24) is rotatably supported in the center of the bottom surface (22a). The feed screw (25) has a driven pulley (26) at its lower end, and a transmission belt (29) is connected between the drive pulley (28) of the servo motor unit (27) attached to the board (21) and the driven pulley (26). Pass the rack.

On the other hand, the inner cylinder (23) has a bottom surface (23a), and a nut (30) attached to the center of this bottom surface (23a) is screwed onto the feed screw (25). The feed screw (25) extends inside the inner cylinder (23) and is rotatably supported at its upper end by a support member (31) fixed to the outer cylinder (22). In addition, an axial guide groove (3) formed in the inner cylinder (23)
2) by inserting the supporting member (31) into the inner cylinder (23).
regulates the rotation of Therefore, the servo motor unit (2
The forward and reverse rotation of 7) rotates the feed screw (25) and moves the inner cylinder (23) up and down. Please note that the servo motor unit (
27) is connected to a controller (33) having a computer function constituting the control means (6), and can raise the inner cylinder (23), for example, in Iμm units.

On the other hand, a support plate (34) is attached to the upper end of the inner cylinder (23). Further, this support plate (34) supports a work table (36) via a pressure detection section (35) using an oil cylinder. A hydraulic sensor (37) using a pressure-electric conversion element is connected to the pressure detection unit (35),
The output of the sensor (37) is supplied to the controller (33). This constitutes a pressing force detection means (5) that detects the magnitude of the pressing force applied to the support plate (34) and work table (36) IJ.

Place the workpiece (G) on the worktable (36) with adhesive (
38), and the framed blade unit (3s) is placed above this. Blade unit (3S
) is reciprocated by a drive section (40) including a crank mechanism (39). Note that the drive section (40) includes a servo motor unit (41), and this motor unit (41) is connected to the controller (33). Therefore,
The number of reciprocations of the blade unit (3s) per unit time is variably controlled by the controller (33).

Next, a method of cutting a workpiece (G) using the control device (1) will be explained.

First, in the cutting process, as shown in Figure 2, there is a position control area (Ll) in the initial cutting section, a pressure control area (L2) in the middle cutting section, and a position control area (L3) in the final cutting section. Divided.

In the position control region (LL), when the blade unit (3s) has reciprocated a predetermined number of times, the servo motor unit (27) is driven to raise the workpiece (G) by, for example, micrometers. Since this position control region (Ll) is at the initial stage of cutting, the load is relatively small and cutting progresses with sufficient accuracy.

On the other hand, as the cutting progresses, the pressure detection value of the pressure sensor (37) gradually increases. When the predetermined setting position is reached, the pressure control region (L2) is entered.

In the pressure control region (L2), the detected pressure value is constantly monitored and controlled so as to reach the predetermined pressure value. In other words, when the pressure detection value becomes smaller as cutting progresses, the servo motor unit (27) is driven to raise the workpiece (G) so that the pressure value becomes the predetermined pressure value. If the pressure becomes higher than a predetermined pressure value, there is a risk that an abnormality will occur, so cutting will be stopped.

Furthermore, when the cutting progresses and reaches the cutting final section, the position control area (L3) is entered, and the position control area (LL
').

Further, the following control is performed simultaneously with the above control. In other words, the third
As shown in the figure, monitor the number of reciprocations of the blade (3), and if it reaches a preset number of times, the servo motor unit (
27) is driven in reverse to lower the workpiece (G) by a certain height H). This allows the blade (3) and workpiece (
G) Since a gap is created between the two, water is injected from a nozzle (not shown) to discharge the chips present in the gap. Note that this lowering time is set by the number of reciprocations of the blade (3). Furthermore, since the pressure detection value from the oil pressure sensor (37) includes the workpiece weight, table weight, push-up pressure, etc., an error caused by a decrease in the workpiece weight, etc. when lowering the workpiece is corrected.

In addition, each setting value etc. mentioned above can be entered manually by operating the keyboard of the setting panel, and the type, size, etc. of the workpiece can be set manually.
Change the setting value depending on the shape etc.

Next, referring to FIGS. 4 to 6, a blade (3) suitable for use in a cutting machine equipped with a control device (1) according to the present invention will be described.
I will explain about it.

In FIG. 4, reference numeral (10) denotes a base, which is formed into a band shape from amorphous alloy steel. Amorphous metals are amorphous metals whose atomic arrangement is disordered and whose main components are ferromagnetic metals such as iron, nickel, and cobalt.

For this reason, excellent magnetic and mechanical properties are recognized, and in this example, a novel blade for a cutting machine is utilized, paying particular attention to the mechanical properties of this amorphous metal. By using such amorphous alloy steel, the base (10) can be made significantly thinner, so the thickness is selected to be approximately 0.025 mm to 0.05 mm. On the other hand, the middle part and lower half of the base (lO) is nickel plated by electrodeposition, and at this time, abrasive grains (11) such as diamond grains are simultaneously electrodeposited on the plating ( Figure 5). Note that since amorphous alloy steel has hydrogen embrittlement, in which it absorbs hydrogen and becomes brittle due to temperature and pressure, it is desirable to perform a predetermined pretreatment to prevent the base (10) from absorbing hydrogen before plating. Also,
Circular holes (10a) and (10b) for attachment to the holding block are provided near both ends of the base (10).

In this way, the base (10) utilizing amorphous alloy steel can reduce its thickness to that of a conventional blade (e.g. 5KJr).
Compared to 4), the thickness can be formed as thin as about 17b. In addition, the cutting distance by the blade (3) is the electrodeposited abrasive grain (11)...
Although it is determined by the maximum thickness including ・, the overall cutting allowance is significantly smaller than that of conventional blades, and the yield of workpieces can be greatly improved. On the other hand, amorphous alloy steel has high hardness, for example, conventional SKj
Although &4 has a difference of 59 in HRC hardness, the same hardness reaches 68 or more in amorphous alloy steel. Therefore, the wear of the blade (3) is extremely low. In addition, since the Young's modulus is low, elongation is extremely small, and the abrasive grains (11) stably adhere to the base (10), and even when the blade (3) is fixed between each holding block, the base (10) Expansion and contraction do not cause any adverse effects such as a decrease in cutting accuracy.

The abrasive grains (■1) may be electrodeposited on the entire lower half of the surface as shown in the upper part of Figure 4, or may be deposited intermittently in the longitudinal direction as shown in Figures 6 (a) to (c). It can also be attached or attached in a serrated manner. Alternatively, it may be attached only to one side,
The electrodeposited surface can be formed into any shape.

Next, a holding block for holding the blade and a method of framing the blade will be described with reference to FIGS. 7 to 12.

The holding block (2) holds the cutting width of the workpiece and the blade (3).
It is formed into a rectangular parallelepiped shape having a thickness corresponding to the added thickness of , and a holding groove (2c) for accommodating the blade (3) is formed in the middle part of one surface (2a). This retaining groove (2c
) is integrally formed with a cylindrical fixing pin (12) at the longitudinal center thereof, and pressure contact pins (13) and (14) of relatively low height are integrally formed on both sides of the fixing pin (12).

In addition, the fixing pin (12) is inserted into the circular mounting hole (10a) or (10b) of the blade (3), and the pressure welding pin (13)
, (14) are pressed against the surface of the blade (3). on the other hand,
The other surface (2b) of the holding block (2) has recesses (
15), (16), and (17) are formed.

As shown in Fig. 10, each holding block (2) is placed in the central recess (15)... When the holding blocks (2) are overlapped, the fixing pins (12) of the adjacent holding blocks (2) are connected to the blade (3). Circular hole (
10a) or (10b) and fit through the blade (3).
) and position between each holding block. Also,
The recesses (16) and (17) on both sides are formed relatively shallowly as shown in FIG. As a result, the blade (3) is deformed toward the four parts (16) and (17) by the pressure contact pins (13) and (14) of the adjacent holding blocks (2), and is held in a sandwich-like manner by pressure contact with the blade 1.

The pins (12), (13), and (14) are formed integrally with the holding block (2), but as shown in Fig. 12, the pins (18) formed separately are fitted into the holes (19). It may also be configured by In addition, the fixing pin (12) is connected to the pressure welding pin (13).
Similarly, the height of the blade is lowered, thereby making the blade (
3) may be mounted in a press-contact state without forming circular mounting holes (10a) and (1, Ob).

Thus, both sides of the blade (3) are accommodated in the holding grooves (10) of the holding block (2), and the holding block (2)
If they are stacked one on top of the other to form a frame, a blade unit (3s) can be constructed in which a large number of blades (3) are arranged in parallel at predetermined intervals as shown in FIG. in this way,
The holding block (2) has both the function of attaching the blade (3) and the function of a spacer that determines the cutting width of the workpiece.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments.

For example, although the case has been described in which the pressure contact force between the workpiece and the blade is controlled to be constant, the pressure contact force may be changed as a function of the workpiece cutting position.

Other changes may be made in the detailed structure, shape, number of bases, materials, etc., without departing from the spirit of the present invention.

〔Effect of the invention〕

As described above, the control device for a cutting machine according to the present invention includes a workpiece moving means for moving the workpiece forward or backward relative to the blade, a pressing force detecting means for detecting the pressing force between the blade and the workpiece, and a pressure detecting means for detecting the pressing force between the blade and the workpiece. Since the apparatus includes a control means for driving and controlling the workpiece moving means so that the pressing force becomes a predetermined magnitude based on the detection result, the following effects are obtained.

■Since the pressure contact force between the workpiece and the blade can be easily and variably controlled, the optimum pressure contact force can be constantly applied to the workpiece, improving cutting efficiency and cutting accuracy. In addition, if the workpiece is moved back at predetermined time intervals during cutting according to the optimum embodiment, chips can be easily removed, which can further contribute to improving cutting efficiency.

■The degree of freedom in control can be increased, such as being able to immediately stop cutting even if an abnormality occurs, which can also contribute to improved workpiece yield and productivity.

[Brief explanation of the drawing]

1st: Main part configuration diagram of a cutting machine equipped with a control device according to the present invention; FIG. 2: Diagram of cutting position vs. load characteristics when cutting a workpiece with the same cutting machine; FIG. 3: With the same cutting machine. Figure 4: A front view of a blade suitable for use in the cutting machine; Figure 5: A sectional view taken along line A-A in Figure 4; FIG. 6: A partial front view of a blade according to another embodiment; FIG. 7: A perspective view of a blade and a holding block that holds the blade; FIG. 8: A plan view of a blade unit framed by the same holding block. Figure 9: Front view of the same holding block with Ni-Blade attached, Figure 10: sectional view taken along line B-B in Figure 9, Figure 11: sectional view taken along line c-c in Figure 9, Figure 12: Holding block shown in Figure 12. FIG. 7 is a sectional view taken along the line DD in FIG. 7 according to another embodiment of the block. In the drawing, (1) Two control devices (3) Two blades (4):'
7-Moving means (5): Pressure force detection means (6) 2nd control means (G): Workpiece Figure 2 Number of reciprocations of the weighted blade Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure S Figure 9 Figure G Figure 10 Figure 11 Figure 12

Claims (1)

[Scope of Claims] [1] Workpiece moving means for moving the workpiece forward or backward relative to the blade, pressure force detection means for detecting pressure force between the blade and the workpiece, and a detection result from the pressure force detection means. 1. A control device for a cutting machine, comprising control means for driving and controlling the workpiece moving means so that the pressing force becomes a predetermined magnitude based on the pressure. [2] The control device for a cutting machine according to claim 1, wherein the workpiece moving means feeds the workpiece in steps. [3] The control device for a cutting machine according to claim 1, wherein the control means controls the workpiece to move backward for a certain amount of time and a certain distance at predetermined time intervals.