JPS5824201B2 - Surface flaw automatic cutting control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mechanizes and automatically removes surface flaws from steel bars, wire rods, etc. by automatically cutting only the flawed portion using a centerless peeling machine in which a cutting tool is configured to move forward and backward. The present invention relates to providing a control method for

As is known, when manufacturing special steel bars and wire rod products using bearing steel, stainless steel, etc., the surface defects of the material are sufficiently removed before hot rolling, and then the material is hot rolled and coiled. However, the surface of this coil has a maximum depth of 0.3
There are defects on the order of mm in some parts, and conventionally, the following means are adopted to remove these defects, and the defects are removed and the material is supplied to the next processing step.

Namely, (I) a method of peeling by squeezing the entire length with a chipper die, (II) a method of cutting and peeling the entire length with a centerless peeling machine, and a method of visually inspecting the entire length. Above, there is a method of polishing and peeling only the flawed areas using a grinder, etc., but when using the method (I), the product yield is reduced because the flaw-free areas are also peeled. This is a factor that increases costs, such as a decrease in the product yield and early wear of the peeling tool.Also, with method (6), only the necessary parts are peeled, which greatly improves the product yield, but This involves unraveling the coil, visually inspecting the entire circumferential surface of the rod or wire, and polishing it each time, which is extremely inefficient and undesirable in terms of efficiency, and has the disadvantage of significantly increasing labor costs. .

The present invention solves the problems of these conventional surface flaw removal methods, and by automatically cutting only the flawed portion of the material, it reduces pressure on labor costs, improves product yield, and shortens cutting processing time. This machine is designed to improve efficiency and reduce overall costs, and uses a centerless peeling machine in which the cutting tool for removing surface flaws can be moved forward and backward from the workpiece by a drive device. As soon as the flaw is discovered, the cutting tool moves back and forth appropriately depending on the condition of the flaw.

In addition, a series of cutting operations can be automatically controlled so that the proper running speed of the material to be processed can be obtained.

The present invention will be described in detail below based on the illustrated embodiments. FIG. 1 shows an example of a flaw cutting line for wires and bars using a conventional centerless peeling machine, and as shown in the figure, The wire 2 mounted in a coil shape on the supply stand 1 enters a straightening machine 3 to be straightened into a straight line, then enters a cutting machine 4 to cut off its head and tail bent portions, and is introduced into a centerless peeling machine. The machine uses a built-in rotary cutter (A) to cut a preset amount (maximum flaw depth of about 0.3 mm) over the entire length of the strand 2 at the same depth of cut. In order to prevent the strand 2 from wobbling during cutting, the machine 5 is equipped with a collet B, which securely grasps and holds the diameter of the strand 2 after cutting, and the cut strand 2 is passed through the winding machine 6. The feeding speed of the wire 2 is restricted by the winding speed of the winding machine 6.

However, as mentioned above, this conventional means has the disadvantage that it cuts off parts with no flaws in the same way.On the other hand, the present invention differs from such a centerless peeling machine 5 and has this disadvantage. A centerless peeling machine is used, which has been slightly modified to allow the cutting tool A to be moved forward and backward by a drive device, thereby detecting surface flaws and removing only the flawed areas. The machine is automatically controlled by the control method of the present invention, and FIGS. 2 and 5 show an example of the centerless peeling machine 5', and this machine will be described later. First, a known rotary probe is installed between the cutting machine 4 showing the embodiment of the control method of the present invention and the centerless peeling machine 5' shown in FIGS. A flaw detector 7 such as a molded eddy current flaw detector is connected to a measuring roller 8,
It is installed together with a control device 9 according to the present invention, and is further connected to a hydraulic system 50 for operating the cutting tool A' and collet B' in the machine 5'.

That is, when a flaw signal detected by the flaw detector 7 is received, from that point on, in order to shift the flaw signal to the cutting point by the cutting tool A', the length of passage of a separately installed material is measured and a rotary pulse is generated. The number of pulses from the measuring roller 8, which is a measuring device, is counted, and when the number reaches the same as the set value, the operating hydraulic device 500, which is a driving device for the cutting tool A', is activated.
It is used as a control signal.

In other words, the flaw signal obtained by the flaw detector 7 and the amount of movement in the length direction by the measuring roller 8 are combined to communicate the control device 9 to the operating hydraulic device 50 of the cutting tool A' as a signal regarding the flaw position. be.

Prior to explaining the details of control by the control device 9, the details of the reciprocating tool type centerless peeling machine 5' which is suitably controlled by the present invention will be explained with reference to FIGS. 2 to 6. The figure is a longitudinal sectional front view of the main part of the centerless peeling machine, and the hollow collet shaft 10 is formed by utilizing the hollow tubular shape of the traveling passage 10a of the wire 2, which is the stiffened material shown in FIG. A rotary outer cylinder 12 is loosely fitted concentrically and rotatably into a hollow shaft 11 which is movably moved forward and backward and concentrically, and the outer cylinder 12 is attached to the frame 1.
3 and 13 in the form of a bridge and rotatably fitted to the outside via bearings 14 and 14, and located on the front end of the hollow shaft 11 via bearings 15 in addition to the outer cylinder 12; A bite holder 16, which is movable forward and backward in the radial direction of the wire 2, is attached to the end face of the element wire 2 via a holder attachment member 17.
A cutting tool 18 is held in the holder 16, and a cam follower 19 is attached to the rear end in the radial direction of the holder 16, and the inner peripheral surface that slides on the cam follower 19 is a cam surface 20a on the outer periphery of the holder mounting member 17. A gear 21 in which an annular cam member 20 is rotatably fitted onto the outer peripheral surface of the front end portion of the rotary outer cylinder 12, an engaging portion 22a,
22b, etc., so that the gear 2
1 includes a separately installed speed increaser (rotary actuator) 23
A gear 24 driven through a shaft 25 meshes with a gear 26 attached to the other end of a shaft 25 of the gear 24 to impart rotation, thereby transmitting rotation to the rotating outer cylinder 12 through the gear 24. It is.

The speed increaser 23 uses a known rotary actuator, and in the illustrated example, 27 is a differential gear shaft extending from the actuator, 28 and 28 are a pair of opposing bevel gears on the same axis, and 29 and 29 are the shaft 27. The differential gear shaft 27 is a pair of bevel gears provided on shafts 30, 30 perpendicular to the 30 and meshing with the bevel gears 28, 28, and the differential gear shaft 27 is mounted on the frame 31 via a bearing 32, and is not shown. is rotated by an appropriate drive source, and the speed increaser 23 is driven by a cutting command using an appropriate electrical signal when a flaw in the wire 2 is detected by the flaw detector 7 shown in FIG. The differential gear shaft 27 is provided so as to rotate in the normal direction, and the bevel gears 28 and 28 on the same shaft 27 are each provided with an interlocking gear 33. As shown in the figure, the other interlocking gear 33 is also provided on the outer cylinder 12 side so as to rotate in conjunction with a drive pulley 34 provided on the rotary outer cylinder 12 side. It meshes with the gear 35.

Further, a collet 36 that can be freely expanded and contracted in the radial direction is attached to the front end of the hollow collet shaft 10 described above, and the collet 36 is attached to a tapered guide surface 37 formed on the inner periphery of the front end of the hollow shaft 11.
By engaging the head 36a of the collet 36,
The collet shaft 10 is moved back and forth by a spring 38 in the illustrated example.

That is, the rear end of the collet shaft 10 is loosely inserted into a pair of front and rear adjustable stoppers 39, 40 provided using the rear end of the hollow shaft 11, and the spring 38 is inserted between the two stoppers 39, 40.
One end is elastically supported by the stopper 40, and the other end is supported by the collet shaft 1.
When the spring 38 is in the released state, the collet shaft 38 is moved forward to the left by the spring 380 as shown in the figure, and the collet 36 is moved toward the taper guide. The surface 37 contracts through the engagement of the head 36a,
The small-diameter cut portion of the wire 2 can be fixedly held, and the rod of the cylinder 42 is used to stop the collet shaft 10 and the collet 36 in the retracted position by the compression of the torn spring 38, for example, using hydraulic pressure or the like. 43 so that the spring 38 is compressed.

Figures 3 and 4 show the cutting tool 18 in the tool holder 16.
FIG. 3 shows the relationship structure between the cam member 20 and
8 shows the standby state, but as shown in the figure, the cam follower 19 enters the recess of the cam surface 20a of the cam member 20, so that the tool holder 16 and the tool 18 are in the raised position, as shown in FIG. 2 shows a state in which the cam follower 19 is pushed out of the recess due to the movement of the cam surface 20a due to the rotation of the cam member 200, and the cutting tool holder 16 and cutting tool 18 are lowered to cut the outer surface of the wire 2.

At this time, the cutting tool 18 is the tool holder 16 cam follower 1
9, a plurality of recesses are arranged at equal radial intervals on the same cross section with respect to the wire 2, and a plurality of recesses are also formed on the cam surface 20a of the cam member 20, so that each bite 18 simultaneously It is desirable to operate the cutting machine to perform cutting.

Regarding the holding of the wire 2, which is the workpiece material, the illustrated collet 36 is used to hold the wire 2 after cutting, so to speak, on the exit side, but it is located in front of the cutting tool 18, that is, on the entrance side. Another collet matching the diameter of the strand 2 is also arranged.

Although this is not shown, since the inlet side is installed in the area where the unfinished cut material passes, no special consideration is required as an operating mechanism during operation, with only the inner diameter adjustment mechanism depending on the material size.

FIG. 5 shows the cutting shape according to the present invention, and the small diameter portion thereof shows the cutting portion 2a.

Automatic removal of surface flaws on the wire 2 (workpiece) by the centerless peeling machine 5' is performed as follows.

That is, as shown in FIG. 6, on the line where the wire 2 passes through the supply stand 1, the straightener 3, the cutter 4, enters the machine 5', and is wound into the winder 6, surface flaws are first removed. When a part without any defects is being wound, the flaw detector 7 does not operate, so the cutting tool 18 is in a waiting position at the raised position as shown in FIG.
4, but this rotation passes through the gear 33 from the gear 35 on the outer cylinder 12 to the differential gear 28 on the speed increaser 23 side,
The signal is transmitted from the 29th group and the gear 33 to the gear 24 and the 26th gear 21, and the cam member 20 is also rotated together through the gear 21 and the engaging portions 22a and 22b.

At this time, the speed increaser 23 side is to be driven only when a cutting command is issued, so if there is no defect, the differential gear shaft 27 is in a stopped state, and therefore the differential gear 28.2 is in a stopped state.
The 9th group only freely rotates as a whole, so the rotational speed of the rotating outer cylinder 12 and the rotational speed of the gear 210 accompanying the cam member 20, and therefore the accompanying speed of the cam member 20, cannot be rotated in perfect synchronization. This allows the cam member 20
The tool holder 16 and the tool tool 18 rotate together in the same state as shown in FIG. 3, and the tool tool 18 remains at the raised position and the strand 2 passes through as it is.

In addition, in the collet shaft 10 concentric with the hollow shaft 11, by keeping the spring 38 in a compressed state by the cylinder 420 and the bolt 43, the collet shaft 10 and the collet 36 are moved to the right in the figure from the position shown in FIG. Therefore, the collet 36 is also in the expanded position by being retracted from the taper guide 37 of the hollow shaft 11, and the wire 2 is not held by the collet 36 but moves along the travel path 10a of the collet shaft 36. As a result, the winding machine 9 winds up the winding machine 9 in a free state without any trouble.

Now, if there is a surface flaw in the wire 2 and this is detected by the flaw detector 7, a command to cut the flawed part is sent.
In response to this command, the speed increaser (low reactor) 23
is driven, and the 70 differential gear shaft 27 is rotated in the normal direction.

Therefore, the rotation of this shaft 270 rotates the shaft 30 connected to the coaxial shaft 27, and the rotation speed of the bevel gear 28 is increased through the bevel gear 29°29.
The rotation speed of the 3rd and 24th shafts 25th gear 26 is also increased, and the rotation of the gear 21
Therefore, the speed of the cam member is increased by 200 rotations, and the rotation speed of the rotary outer cylinder 12 and the rotation speed of the cam member 210 are shifted by 270 rotations of the differential gear shaft.

Therefore, the cam surface 20a of the cam member 20 moves as shown in the fourth figure, the cutting tool holder 16 descends via the cam follower 19, and the cutting tool 18 cuts the surface of the wire 2 as shown in the drawing and removes the flaws. The part will have to be removed.

At this time, by adjusting the rotational speed of the bevel gear 28, the amount of descent of the cutting tool holder 16 and the cutting tool 18 can be adjusted in combination with the shape of the cam surface 20a of the cam member 20, thereby selecting the amount of cutting entry of the cutting tool 18. Is possible.

Also, during this cutting, the compressed spring 38 is released via the cylinder 42 to make it free.
Due to the restoring force, the collet shaft 10 is moved to the left in the drawing as shown in the second figure at the same time as the cutting tool 18 advances, and the collet 36 is also moved along with the collet 36 so that its head 36a is aligned with the hollow shaft 1.
By engaging with the taper guide 37 of 1, the collet 36 retracts and closes, its inner diameter becomes smaller, and the cut portion 2a of the strand 2 is held.

At this time, the spring 38 is adjusted so that the frictional force between the wire 2 and the collet 36 overcomes the winding force of the winder 9 and does not brake the running of the wire 2 (this is necessary). Furthermore, even when the diameter of the strand is gradually increased due to the upward retraction of the cutting tool 18, the restoring force of the spring 38 is used to balance the strand 2 and complete the holding of the strand 2, so that flaws can be removed and cut smoothly. It is set to .

When the surface flaws have been cut off and passed, the speed increaser 23 is operated in reverse according to the cutting length command, and the differential gear shaft 27 is reversely rotated, whereby the cam member is cut off through the gear transmission. By reversing the rotation of the cam follower 19 and the cam 20a, the tool holder 16 and the tool 18 are raised by the action of centrifugal force and returned to their previous positions, and the strands 2 are again in the state shown in FIG. While freely rotating in the outer circumferential direction, it waits for the next cutting command due to the discovery of a flaw.

Further, the collet 36 and the collet shaft 10 which are in the forward position are also moved backward by the return stroke of the rod 43 in the cylinder 42, and the collet 36 is also opened and expanded.

The present invention relates to the automatic control of the centerless peeling machine 5' in which the cutting tool 18 is configured to move forward and backward toward the strand 2 via the drive device, and as shown in FIGS. 2 to 6. In the figure, the actuating devices for the cutting tool 18 and the collet 36 are constructed as shown in the example, but these actuating devices can of course be freely selected, and in FIG. As an example, a hydraulic device 50 is shown.

FIG. 7 is a block diagram of the control means in the control device 9 of the present invention. To explain this, when a surface flaw in the wire 2 is detected by the flaw detector 7, the depth of the flaw is first detected by the device 9. In addition to transmitting the signal to the built-in bit depth setting device, it also transmits a flaw presence/flaw end signal Sig to the pulse calculator 51, and similarly transmits this to the sampling pressure signal voltage generator. It is.

At this time, as mentioned earlier with reference to FIG. 6, the flaw detector 7
The flaw signal obtained by the measuring roller 8 is used to combine the flaw length with the flaw length to obtain a signal regarding the flaw position.
The number of pulses corresponding to the length measured by the measuring roller 8 (flaw length) is transmitted to the pulse calculator 51.

This pulse calculator 51 first calculates the running speed V of the strand 2 on the line using the number of pulses and the sampling time Δt transmitted by the sampling pressure signal voltage generator 1, and calculates the running speed V of the wire 2 on the line. It sends a signal to the cutting tool advance speed calculator in the control device 9, and secondly, it receives the flaw presence signal.

This is sent as a pulse to the front end length counter 2 in the control device 9, and the third function is to receive the flaw signal and send the same pulse to the rear end length counter 2 in the control device 9. This is what we do.

As a result, the advance speed V of the cutting tool is sent to a calculator that combines the advancing speed (processing speed) and the running speed V of the wire 2 and calculates the cutting tool cutting angle θ which is set in advance. The forward and backward speed of the cutting tool 18 in the radial direction is calculated based on the signals from the cutting tool and the pulse calculator 51, and is transmitted to the converter 4 for commanding forward movement of the cutting tool and the converter for commanding backward movement of the cutting tool.

Here, the front end length 1L and the rear end length 2L are the 12th
The length shown in the figure.

That is, in the flaw removal method, information regarding the flaw signal is obtained from the flaw signal obtained by the flaw detector 7 and the measuring roller 8 as described above.
This signal is used to determine the position of the flaw by combining the amount of movement in the length direction by Taking into account that the wire is cut while it is running, the cutting depth is set to a predetermined depth in front of the flaw portion and before the beginning of the flaw.

Therefore, the cutting tool starts moving toward the center of the wire in front of the flaw, but when the cutting tool start signal is output and cutting actually begins, the length to be cut is determined by the time the flaw moves relatively to the cutting tool. The front end length is 1L, which is set by the front end length setting device.

In addition, in order to ensure that the flaw length is removed at the rear of the flaw part, extra cutting is performed at a predetermined cutting depth and the cutting tool is moved away from the wire 2. The length in the longitudinal direction is called the rear end length 2L, and this is set using the rear end length setting device.

Therefore, set values are added to the front end length counter 2 and the rear end length counter E by the front end length setter C and the rear end length setter port, but at this time, the front end length counter A value smaller than the setting device C is set to the winding machine speed change setting device G, and a value larger than the setting device port is set to the rear end length counter H using the winding machine speed change setting device ’. Ru.

Here, the winder speed change setting port' is changed from the traveling speed V to a speed down to ensure cutting by the cutting tool, while the winding machine speed change setting port' is changed from speed down to speed up. In other words, the vehicle speed is changed to return to the traveling speed V to improve efficiency.

In response to the pulse from the pulse calculator 51, the cutting start time by the cutting cutter 18 is counted, and when the count reaches the set number, the count-up signal is sent to the converter for the tool forward command and the converter for the tool backward command. By sending the command to , the cutting tool 18 is commanded to move back and forth.

At this time, in order to control the traveling speed of the wire 2 during cutting, the winding motor speed regulator for the winding machine 6 is connected from the front end length counter 2 and the rear end length counter 2 described above. It can be controlled by applying a signal, and each setting value of the front end length setting device C and the rear end length setting device mouth is the setting distance (interval) of the cutting tool 18 in the flaw detector 7 and the centerless peeling machine 5'. This is determined from the running speed of the strand 2, and the difference between the set value and the flaw detection length is the margin cutting length for the flaw detection length (flaw length).

In addition, the tool advance command converter 1 receives the output signal from the front end length counter 2, the setting amount in the tool cutting amount setting device 2, and the tool forward and backward movement speed V from the tool advancement speed calculator. , bit, collet operating hydraulic system 5
The command will be transmitted to 0.

In addition, the front end length counter 2 has a function in which pulse input is not counted from the start of the operation of the hydraulic device 50 (forward, reverse) to the time when the operation of the hydraulic device 50 is completed (cutting completion) when the count has passed from the start of the count to the count up. have,
The information is fed back from the hydraulic system 50, and the counter is reset in the same way.

In addition, the converter for commanding backward movement of the cutting tool receives the output signal from the rear end length counter and the forward and backward movement speed V of the cutting tool from the cutting tool advancing speed calculator, and converts the output signal to the hydraulic device 50 for operating the cutting tool and collet. will be communicated to.

In addition, in the trailing end length counter, when the next signal (flaw signal) is input from the pulse calculator 51 during counting, the counting stops, the counting up to that point is canceled, and the next signal Counting is started anew by the rear end signal, and upon completion of the backward movement, the counter is reset, and this information is fed back from the hydraulic system 50.

The winding machine motor speed regulator N, which determines the running speed of the strand 2 on the line, processes signals for forward and backward movement commands for the cutting tool 18 from the front end length counter 2 and the rear end length counter 2. Similarly, the running speed of the strand 2 on the line is set to an appropriate speed for cutting when cutting is required, and when cutting is not required, the running speed of the wire 2 is set to be faster than the running speed during cutting. The winding speed of the take-up machine 6 is controlled, and as shown in FIG. By applying the winding machine speed change setting device Go to the front end length counter 2, an operation command is applied to the winding machine motor speed regulator 2 earlier than the front end cutting command (bite advance command), and proper cutting is performed. As for the rear end of cutting, the cutting length is set to a value greater than the cutting length set by the rear end length setting port. By applying the operation command to the winding machine electric motor speed regulator N, which is slower than the rear end cutting command (bite backward movement command), a higher feed speed can be given. It is controlled by

The hydraulic device 50 for operating the tool and collet is operated in response to commands from the tool forward command converter 1 and the tool backward command converter 1, based on the above calculation results, and is operated as shown in FIGS. 2 to 4 above. Regarding the cutting tool 18 and collet 36 in the centerless peeling machine 5' illustrated in the figure,
Hydraulic control is performed to perform the necessary operations.

That is, as mentioned above, the cutting tool 18 detects surface flaws by the flaw detector 7 and rotates the cam member 200 by the drive of the speed increaser (rotary actuator) 23. The collet 36 moves forward toward the line 2 to cut and remove the flaw, and at the same time, the collet 36 moves forward together with the collet shaft 10 due to the restoring force caused by the release of the spring 38, and the collet 36 performs a series of operations in which the small diameter part to be cut is gripped. In doing this, the control device 9 of the present invention detects the running speed of the wire 2 and the position of the flaw (this includes the size and depth of the flaw on the surface), and in this detection, cuts the bite using the flaw depth signal. A preset tool cutting angle θ is determined by selecting the amount of insertion, and by combining and calculating the running speed signal, the presence of a flaw, the flaw position signal at the end of a flaw, the running speed of the strand, and the machining speed of the tool. Based on the calculation results of the advance/retreat timing of the cutting tool using the setting signal of the setting device A, and the calculation of the advancing/retracting speed of the cutting tool using the traveling speed signal and the setting signal of the setting device A of the cutting tool cutting angle θ, the most appropriate and smooth The operation is given as instructed via the hydraulic device 51 for operating the bite and collet.

At this time, the wire 2 When performing cutting work at a traveling speed of
As described above, it is easily possible to set the speed to be suitable for cutting, and to change to a higher speed than the traveling speed during cutting when cutting is not performed.

In the above description, the cutting tool cutting depth setting device G is used to set the cutting amount C of the portion corresponding to the flaw depth shown in FIG.
In addition, the cutting tool cutting angle setting device A is used to set the taper angle θ shown in Fig. 8.
The cutting angle (one taper angle) θ is set in advance by combining the material running speed V and the machining speed V of the cutting tool.

The taper angle θ is set in advance in order to smoothly insert the cutting tool, since the work of cutting the wire by the amount C during cutting with the cutting tool is done while the wire is running. The taper angle θ is set in order to minimize fluctuations in die load in the next process of wire drawing using dies.

FIG. 8 is an explanatory diagram of the cutting shape of the wire 2 according to the present invention, and in the figure, 2a indicates the small diameter portion cut by the cutting tool 18, and ■ indicates the advancing speed of the wire 2, A1
indicates the position of the cutting tool 18 immediately before entering the cut, A2 indicates the instantaneous position of the cutting tool 18 when it stops retreating, ■ indicates the forward and backward movement speed of the cutting tool 16 (operation by the cam 20 and the cam follower 19), and L is the length of the surface flaw. , Ll is the distance from the discovery of the flaw to the start of the advance of the cutting tool 18, L2 is the distance from the confirmation of the end of the flaw to the start of the retreat of the cutting tool 18, and a is the outer diameter of the strand 2 before cutting, and b is the outer diameter after cutting by the cutting tool 16, and C is the amount of cutting.

In addition, g is the gap between the outer circumference of the wire 2 and the standby position of the cutting tool 18, 11 and 12 are the margin lengths for the shape of internally penetrating flaws compared to the length of flaws detected on the surface, and The length until the amount C is achieved, 14 indicates the advancing length of the wire 2 during the non-working time when the cutting tool 18 enters and retreats (the gear joint between the outer circumference of the wire 2 and the cutting tool 18), and θ is the length of the wire 2 during the time when the cutting tool 18 approaches and retreats. 18, and if this θ is constant, the L1.
By adjusting L2, it changes by 1 or 12 mo.

Furthermore, Fig. 9 shows a flaw where the interval between flaws is relatively long and therefore the detection signal does not overlap, the distance L1 from discovery of the flaw to the start of entry of the bite 18, and the distance L1 from the confirmation of the end of the flaw to the start of the entry of the bite 18. Setting the distance L2 until the start of backward movement,
This is a time chart of forward and backward commands for the cutting tool 18, and the time relationship is as shown.

On the other hand, in the case shown in FIG. 10, the flaw interval is short and the detection signal overlaps between the first flaw and the second flaw.
Distance L1 from the discovery of the flaw to the start of the advance of the bite 18, and distance L from confirmation of the end of the flaw to the start of the retreat of the bite 18.
2 and the time chart of the forward and backward commands of the cutting tool 18 are also shown.

In such a case, if multiple sets of counters are provided, they can be operated in response to each flaw, so that cutting can be performed in response to the flaw, as shown in the example shown in Fig. 9. .

As described above, the present invention uses a centerless peeling machine equipped with a cutting tool that can move forward and backward toward a material to be treated, automatically detects surface flaws, and determines the content of the flaw based on a detection signal. By automatically determining and controlling the appropriate cutting depth of the cutting tool corresponding to the cutting speed and the traveling speed of the workpiece, the timing and speed of advancing and retreating the cutting tool are automatically determined and controlled. A series of screening operations can be performed continuously and automatically, such as cutting and removing the wire smoothly and completely at an appropriate speed, and feeding the non-defective part at high speed. Regardless of the presence or absence of cutting, it is possible to significantly improve material yield, prevent excessive and early wear of cutting tools, and prevent excessive wastage of processing time, significantly reducing the overall cost of cutting work. It is possible.

Since cutting is performed based on calculation results based on a combination of necessary specifications, it is possible to effectively remove cutting errors and completely eliminate surface defects on various wire rods and bars. It is an excellent automatic removal means for peeling, and requires only a slight modification of the bite and collet of a conventional centerless peeling machine, and a combination of relatively simple control equipment in the control device 9, which eliminates implementation difficulties and operational difficulties. There is no complexity.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an example of a cutting line organization using a conventional centerless peeling machine, FIG. 2 is a longitudinal sectional front view of the main part of an example of a centerless peeling machine with a cutting tool advancing and retracting type that implements the method of the present invention, and FIGS. Fig. 4 is a longitudinal side view of the cutting tool and the main parts of its reciprocating mechanism, Fig. 5 is an explanatory diagram of the flaw removal cutting shape, and Fig. 6 is an explanation of the arrangement of the main control parts of the method of the present invention in a centerless peeling machine of the reciprocating tool type. figure,
FIG. 7 is a block diagram of the control means according to the method of the present invention;
The figure is an explanatory diagram of the cutting situation with the same flaw, Figures 9 and 10 are time charts of the same flaw and the cutting tool, Figure 11 is an explanatory diagram of the relationship between the cutting tool and the running speed of the wire, and Figure 12 is the front end. It is an explanatory view showing length and rear end length. 1... Supply stand, 2... Element wire (material to be processed), 3... Straight line machine, 4...
Cutting machine, 5, 51... Centerless peeling machine, 6... Winding machine, 7°... Flaw detector,
8... Measuring roller, 9... Surface control device, 50... Bit, hydraulic device for collet operation,
51...Pulse calculator.

Claims (1)

[Scope of Claims] 1. A centerless peeling machine in which a cutting tool is configured to move forward and backward using a drive device, and is used to automatically cut a flawed part of a workpiece, and is capable of automatically cutting a flawed part of a workpiece by changing the running speed of the workpiece and the axial length of the flaw. The position of the flaw is determined by the flaw depth signal, and the depth of cut to be applied to the cutting tool is set based on the flaw depth signal of the detection signal. By combining the machining speed of the cutting tool and the machining speed of the cutting tool, the advancing and retreating timing of the cutting tool is calculated based on the cutting angle setting value signal set in advance, and at the same time, the advancing and retreating speed of the cutting tool is calculated using the traveling speed signal and the cutting angle setting value signal. calculate,
A surface flaw automatic cutting control method characterized by controlling the operation of a cutting tool drive device according to these calculation results. 2 A centerless peeling machine in which a cutting tool is configured to move forward and backward using a drive device is used to automatically cut a flawed part of a workpiece, and the flaw is determined by the traveling speed of the workpiece and the axial length and depth of the flaw. Detects the position of the cutting tool, and sets the depth of cut to be applied to the cutting tool based on the flaw depth signal of the detection signal, and also uses the traveling speed signal, the flaw position signal, the traveling speed of the material to be processed, and the machining speed of the cutting tool. Computing the advance and retreat timing of the cutting tool based on the cutting angle setting value signal set in advance by combining the cutting tool, and simultaneously calculating the advancing and retreating speed of the cutting tool using the traveling speed signal and the cutting angle setting value signal,
The operation of the cutting tool drive device is controlled according to the results of these calculations, and in synchronization with the movement timing of the cutting tool, the traveling speed of the material to be processed is adjusted to a speed suitable for cutting during cutting operations, and from the above-mentioned speed during idle cutting. An automatic surface flaw cutting control method characterized by controlling the traveling speed of a material to be processed so as to increase the speed.