JPH0248163A - Multiple steel wire type cutting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is a multiple steel wire cutting device (multi-wire saw) for cutting an article made of a hard brittle or difficult-to-cut material into a large number of thin pieces at once.

Specifically, the present invention relates to a multiple steel wire cutting device that is capable of reciprocating steel wires at high speed without fear of wire breakage, and can also change the amount of movement of the steel wires depending on the material of the article.

(Prior art) As one of the means for cutting a 7 cm article from hard brittle or machinable material into thin pieces, a small diameter steel wire is fed out from a bobbin through three or more multi-groove pulleys parallel to each other. The winding bobbin is made to wind the winding bobbin little by little while repeating reciprocating motion, and the steel wires are arranged parallel to each other between the two multi-groove pulleys and run in the same direction, It is known that the article is bitten into the steel wire by the parallelly arranged portions, and when the article is bitten, abrasive grains are attached to the steel wire and carried along, and the cutting is performed by the grinding action of the abrasive grains.

The steel wire is paid out in length from a payout bobbin.

Next, it is rewound to a shorter length and wound onto the take-up bobbin while repeating the cutting operation, so each time the running direction is changed from forward to homeward and from homeward to forward. Slow down, stop.

As the acceleration is repeated, the steel wire becomes alternately relaxed and tensed each time the wire is reversed, and there is a risk that the wire will break if it becomes too tense.

Therefore, a seesaw mechanism including seesaw rollers attached to both ends of the seesaw lever and fixed rollers opposed to these rollers was installed between the multi-groove pulley, the payout bobbin, and the take-up bobbin. A technique is known in which a steel wire is run while tensioning the relaxed side and relaxing the tensioned side (see Japanese Patent Publications No. 56-198, No. 56-199, and Japanese Utility Model Publication No. 555280).

(Problems to be Solved by the Invention) In addition to being able to prevent the steel wire from breaking during reversal and ensure cutting as described above, the multiple steel wire cutting device also has the following features: It is required that the cut surface be beautiful and require almost no finishing.

However, the above-mentioned seesaw mechanism is configured to prevent wire breakage by swinging a seesaw lever with seesaw rollers attached to both ends, and at the same time to equalize the tension of the steel wire during cutting. If the deceleration and acceleration times during the reversal of the steel wire are shortened, the goosebump deceleration of the seesaw lever will increase, causing a large inertia, which will actually increase the risk of wire breakage. Alternatively, if you aim to increase the efficiency of cutting by increasing the maximum running speed holding time of the steel wire, increase the length of the seesaw lever or increase the number of seesaw rollers to increase the length of the steel wire between the multi-groove pulley. It is necessary to increase the amount of wire, but in this case too, the inertia increases and there is a risk of wire breakage, so high cutting efficiency cannot be achieved.

The present invention solves these problems, and makes it possible to reciprocate the fiiA wire at high speed without fear of wire breakage, and to perform appropriate cutting by changing the amount of movement of the steel wire depending on the material of the article. This was invented with the purpose of providing a multiple steel wire cutting device that can perform

(Means for Solving the Problems) According to the present invention, a cutting portion of an article is formed by arranging steel wires between two multi-groove pulleys so as to run parallel to each other in the same direction. As a means for solving the above-mentioned problem of a multiple steel wire cutting device in which a feeding bobbin and a winding bobbin for the steel wire are installed before and after the cutting section.

a constant tension mechanism consisting of a fixed roller and a dancer roller, respectively installed between the cutting section and the feeding bobbin and the winding bobbin and around which the steel wire is wound; a constant tension generating mechanism for individually moving the dancer rollers up and down; a position detection mechanism for detecting the displacement of each of the dancer rollers; an electric motor for rotating the multi-groove pulley alternately in forward and reverse directions according to a predetermined grogram; and the feeding bobbin. and an electric motor that rotates the winding bobbin and the winding bobbin individually in the feeding direction or the winding direction based on the signal from the position detection mechanism.

It is preferable that the constant tension generating mechanism is constituted by a cable formed by lowering the dancer roller, a drum around which the cable is wound, and an electric motor that reciprocates each drum separately.

Moreover, the electric motor is preferably a torque motor.

Further, it is preferable that the electric motor for rotating the multi-groove pulley, the feeding roller, and the take-up roller is a servo motor.

(Function) The article is cut into thin pieces by biting the steel wire at the cutting section as it moves back and forth little by little from the payout bobbin to the take-up bobbin. Before and after the cutting section, the steel wire is wrapped around a constant tension mechanism consisting of a fixed roller and a dancer roller.

A constant tension generation mechanism moves the dancer roller up and down in a direction to absorb tension changes, and the rotational direction and speed of the payout bobbin and take-up bobbin are controlled according to the displacement of the dancer roller, so tension fluctuations are immediately absorbed and cutting is achieved. The line maintains constant tension at and before and after it.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. Three multi-groove pulleys 1.2.3, two of which multi-groove pulleys 1.2 are placed on a horizontal plane, and Another multi-groove pulley 3 is placed in the middle between them and arranged parallel to each other, and these are rotated in the same direction and at the same speed by a winding transmission mechanism 4 such as a timing belt or chino. 1. Two multi-groove pulleys placed on a horizontal plane.
2 forms the cut section 5.

A payout bobbin 6 and a take-up bobbin 7 are installed before and after the cutting section 5, that is, on both sides, and between the payout bobbin 6 and the first multi-groove pulley 1, a traverser 8. dancer roller 10
．． The idle rows 211 are placed in order, and the steel wire 12 wound around the payout bobbin 6 is wound in the above order until it reaches the first multi-groove pulley lK, and is then wound around the three multi-groove pulleys 1.2.3 at equal intervals. It is wound many times parallel to each other.

An idle roller 13 is provided between the second multi-groove pulley 2 and the winding bobbin 7. Stationary roller 14. Dancer roller 15. The steel wire 12, which is wound around the multi-groove pulleys 1, 2, and 3 by the trappers 916, is further wound in the above order and reaches the winding bobbin 7.

The traversers 8 and 16 operate when winding the steel @ 12 onto the payout bobbin 6 and when winding it onto the take-up bobbin 7, and work to wind the steel uniformly in the axial direction of the bobbin, and these are arranged parallel to each other. has been done.

The stationary roller 9 on the payout side and the dancer roller 10 degrees, and the stationary roller 14 and dancer roller 15 on the winding side are arranged parallel to each other and above and below, respectively, and wind the steel wire 12 in the required number of turns. The upper dancer rollers 10, 15 are rotatably supported by support frames 17, 22, respectively, and are connected to cables 20, 25 wound around drums 19, 24 which are reciprocally rotated by electric motors 18, 23 which can be reciprocated in forward and reverse directions. A support frame 17.22 is suspended. Electric motor】8゜2
Reference numeral 3 uses a torque motor, and together with the drums 19 and 24° cables 20 and 25, constitutes a constant tension generating mechanism 21.26 that maintains a constant tension on the steel wire 12, which causes the dancer rollers 10 and 15 to move up and down. The stationary rollers 9 and 14 corresponding to these have constant tension mechanisms 27 and 28 that absorb loosening and excessive tension of the steel wire 12 on the feeding bobbin 6 side and the winding bobbin 7 side of the cutting section 5 and maintain a constant tension. It consists of

On the sides of the dancer rollers 10.15, their position detectors $29.30 are provided. This position detection mechanism 2
9.30 uses any known mechanism for continuously detecting displacement, such as a variable resistor or variable capacitor, and these empty signals 29a and 3Qa are controlled by an electronic control device such as a microcomputer. Enter 140.

There are three multi-groove pulleys in the multi-groove pulley 3 of the hitting ball! , 2.degree. 3 are directly connected, and an electric motor 33.degree. These electric motors 3133.35 are servo motors, and the driving power 31a, 3 is controlled by the control device 40.
3a, driven by 35m.

Note that the idle rollers 11 and 13 are for changing the direction of the steel wire 12, and these and the traversers 8 and 16
is auxiliary. Further, the constant tension generating mechanism 21.
26 is a support frame 17.22 for the piston rod of the fluid pressure cylinder.
A configuration connected to.

It is also possible to use a configuration in which gears are driven by an electric motor, gears are provided on the support frame 17.22, and the gears are meshed with each other. The illustrated embodiment in which constant tension control is performed using 23 is superior in terms of responsiveness and accuracy.

The electric motor 31 rotates the multi-groove pulley 1.2.3 alternately in the forward and reverse directions according to a preset program, but the length of the steel @12 that is fed out from the payout bobbin 6 and wound onto the take-up bobbin 7 is determined by the electric motor 31. Since the length is set to be a little longer than the length by which the steel is fed out from the take-up bobbin 7 and rewound onto the pay-out bobbin 6, the steel @12 gradually transfers from the pay-out bobbin 6 to the take-up bobbin 7 while repeating reciprocating motion.

At the cutting part 5 on the way, the articles M placed on the pedestal 38 of the pressure mechanism 39 consisting of the fluid pressure cylinder 36 and the pedestal 38 at the tip of the piston rod 37 are arranged at equal intervals and parallel to each other in the same direction. It bites into the running steel wire 12 and cuts it into thin pieces.

When the 12 steel wires are traveling from the payout bobbin 6 to the take-up bobbin 7 or when they are traveling back in the opposite direction, each constant tension generating mechanism 2126 is activated by the electric motors 18 and 23 consisting of torque motors. By rotating to a position where a constant torque is generated, the dancer roller 10.15 is automatically moved up and down to a position where a constant tension is applied to the steel Ifs12.

Based on the signals 29a and 30a from the position detector $29.30 that detected these displacements, the control device fiI40 controls the electric motor 33. Supply the drive power 33a, 35a to give a winding speed of 9 and a winding speed at which a constant tension of the K steel wire 12 is maintained.

Therefore, the direction of rotation of the electric motor 31 is reversed and the steel wire 12
Even if the running direction of the roller is reversed and the slack side and overtension side are switched, the tension is maintained by controlling the rotational direction and speed of the payout bobbin 6 and take-up bobbin 70 while the dancer roller 10.15 moves up and down. Fluctuations are absorbed immediately.

The steel wire 12 always maintains a constant tension at the cutting section 5 and before and after the cutting section 5.

In this embodiment, a servo motor is used as the electric motor 3 which directly drives the multi-groove pulley 1.2.3.
The running length of the steel wire 12 per outbound and one return trip can be changed arbitrarily.

When the article M is hard and brittle and has relatively good machinability, it can be cut without producing saw marks on the cut surface by shortening the running length and cutting in small increments. Further, when the article M is difficult to cut, the time required for cutting can be shortened and the cut surface can be made beautiful by increasing the running length (and increasing the maximum running speed holding time).

Furthermore, since the same servo motor is used as the electric motor 33.35 that drives the payout bobbin 6 and the take-up bobbin 7, the position detection mechanism 29.30 that responds to changes in the tension of the steel @12.
The steel Ii+12 can be paid out or wound up by appropriately following the signals from the steel Ii+12 without causing slack or excessive tension.

Next, in the second embodiment, the cutting section 5 and the article M are immersed in abrasive grains for cutting, thereby improving the cutting rate and the working environment. That is, the cutting section 5 traverses the II filtration and cutting chamber 43 from the lower chamber 41 and the upper chamber 42, which can be separated vertically from each other, through their mating surfaces in an airtight manner, and the piston rod of the pressurizing mechanism 39 37 is the lower room 4j
The lower chamber 41 is airtightly penetrated by a bellows 44, and an abrasive grain inlet 45 is provided at the bottom of the lower chamber 41, and the abrasive grains are stored at the top of an upper chamber 42 which is movable up and down by an elevating mechanism (not shown). This configuration is provided with a discharge port 46.

The abrasive grains are stored in a slurry state mixed with cutting oil in a storage tank 48 having stirring blades 47.

From this, the inlet 4 is passed through the inlet pipe 50 with the pump 49.
5, the cutting chamber 43 is filled with the cutting chamber 43.

Further, the slurry in the cutting chamber 43 returns to the storage tank 48 from the top delivery port 46 via the delivery pipe 51 and is replaced little by little, and the cutting chamber 43 is filled under pressure by the pump 49.

Therefore, even if the steel wire 12 is run at a high speed, the abrasive grains and cutting oil will not be scattered around, and the abrasive grains will be attached to the steel wire 12 and will be forced into the cut groove of the article due to pressure. Particularly, the article M is constantly ground as the steel wire 12 travels.

By increasing the cutting ability and eliminating abnormal generation of frictional heat, it is possible to obtain a cut surface as beautiful as a lapping finish.

When the cutting is finished, the slurry is discharged by an appropriate means (not shown), and the upper chamber 42 is separated from the lower chamber 41.

(Effects of the Invention) According to the invention, the multi-groove pulley of the cutting section, the steel wire payout bobbin, and the winding bobbin are rotationally controlled by separate electric motors, and the steel wire is directly run by these electric motors. In addition, it has a configuration in which a constant tension mechanism using a dancer roller and a constant tension generating mechanism by moving the dancer roller up and down are installed before and after the cutting section, so the steel wire is not overstressed or loosened, preventing wire breakage and making it easier to sharpen. Not only can cutting be performed, but since there are no parts where large inertia acts, the steel wire can be cut with high efficiency without the risk of wire breakage even if the steel wire is run at high speed and the deceleration and acceleration times during reversal are shortened. This makes it possible.

Also, if a servo motor is used as the electric motor,
It is possible to arbitrarily change the running length of the steel wire per one outbound and one return trip, and it is possible to perform appropriate cutting to obtain an efficient and beautiful cut surface depending on the material of the article. It is.

[Brief explanation of the drawing]

FIG. 1 is an arrangement front view showing a second embodiment of the present invention. Figure 82 is a perspective view of the main part. 1.2...Multi-groove pulley, 5...Cutting part,
6...Feeding bobbin, 7...Take-up bobbin, 9.14...Stationary roller, 10.15...
...Dancer roller, 18.23 ...Electric motor, 19.24 ...Drum, 20.25
......Cable, 21.26...Constant tension generation mechanism, 27°28...Constant tension mechanism, 29.
30...Position detection mechanism. 31.33.35... Electric motor.

Claims (4)

[Claims] (1) Steel wires (12) are arranged between two multi-groove pulleys (1, 2) so as to run parallel to each other and in the same direction to form a cutting section (5) of the article; In a multiple steel wire cutting device in which a payout bobbin (6) and a take-up bobbin (7) for the steel wire (12) are installed before and after the cutting unit (5); The steel wire (12) is arranged between the bobbin (6) and the take-up bobbin (7), respectively.
) wrapped around the stationary rollers (9, 14) and dancer rollers (
10, 15); and a constant tension generating mechanism (21) that individually moves the dancer rollers (10, 15) up and down in a direction that absorbs changes in the tension of the steel wire (12). , 26); and a position detection mechanism (29, 30) for detecting the displacement of each of the dancer rollers (10, 15); A rotating electric motor (31), and the feeding bobbin (6) and the winding bobbin (7) are rotated individually in the feeding direction or the winding direction based on signals from the position detection mechanism (29, 30). Electric motor (33
, 35) and; A multiple steel wire cutting device. (2) The constant tension generating mechanism (21, 26) connects the ropes (20, 25) from which the dancer rollers (10, 15) are suspended, and the drums (19, 24) around which the ropes (20, 25) are wound.
) and electric motors (18, 23) for reciprocating the drums (20, 25) respectively. (3) Electric motors (31, 33,
The multiple steel wire cutting device according to claim 1, wherein 35) is a servo motor. (4) The multiple steel wire cutting device according to claim (2), wherein the electric motors (18, 23) of the constant tension generating mechanism (21, 26) are torque motors.