JP2741561B2 - Automatic shaping device for welding electrode wheel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to an automatic shaping device for a welding electrode wheel, and more particularly to an automatic shaping device for a welding electrode wheel used for resistance welding such as seam welding. In this specification, a description will be given of a welding electrode wheel used for seam welding.

[0002]

2. Description of the Related Art In seam welding, a portion to be welded of a metal to be welded is brought into contact with a welding electrode wheel, an electric current is applied from the welding electrode wheel to the above-mentioned portion, and the electric resistance of the metal itself and the metal This is a method of heating by utilizing the contact resistance of the above, and welding by this heating. The seam welding is one mode of lap welding during resistance welding.

In performing the above seam welding, it is inevitable that metal materials such as components of the plating applied to the welding object and components constituting the welding object itself adhere to the outer peripheral surface of the welding electrode wheel. . The degree of adhesion of the metal material to the outer peripheral surface of the welding electrode wheel increases as the time during which the welding electrode wheel is used for seam welding increases, and eventually a highly reliable, high-quality seam welding cannot be performed. Would.

[0004] In view of such circumstances, the outer peripheral surface of a welding electrode wheel used for seam welding for a certain time is cut together with a metal material to be welded adhered to the outer peripheral surface to thereby form the welding electrode. Conventionally, a method of shaping a ring into a perfect circle has been employed.

The method is shown in FIG. 3, in which the contact roller 3 is rotated counterclockwise in FIG. 3 by feeding the contact roller adjusting screw 1 to the right in FIG. 5 is a cutting tool having a width substantially equal to the width of the outer peripheral surface of the welding electrode wheel 5 in a state where the end of the tip 7 is in contact with the outer peripheral surface of the seam welding electrode wheel 5 while being in contact with the outer peripheral surface of the welding electrode wheel 5. 9 and fixed by cutting bit adjusting screws 11a and 11b. According to the above-described embodiment, the outer peripheral surface of the seam welding electrode wheel 5 is cut by the cutting tool 9. Reference numeral 13 denotes a contact roller and a cutting tool holding mechanism for holding the contact roller 3 and the cutting tool 9.

[0006]

However, when the above method is adopted, the tip 7 and the contact roller 3 are simultaneously in contact with the outer peripheral surface of the seam welding electrode wheel 5 and the shaping tool 9 is used.
Must be able to position the contact roller 3 and the tip 7 so that the outer peripheral surface of the welding electrode wheel 5 can be cut. That is, if the shaping tool 9 is too far to the right in FIG. 3, the cutting amount of the welding electrode wheel 5 by the shaping tool 9 is too large, and if the shaping tool 9 is retracted from the contact roller 3, Since the welding electrode wheel 5 cannot be cut by the shaping tool 9, the above-mentioned positioning must be performed accurately.

However, since the above-mentioned positioning is performed by manually operating the above-mentioned contact roller adjusting screw 1 and the shaping bit adjusting screws 11a and 11b, it is extremely difficult to perform the above-described accurate positioning. .

In view of the above, a method as shown in FIG. 4 has been proposed. In this method, for example, by applying a rightward force in FIG. 4 generated in the cylinder 15 by a fluid pressure such as air pressure to the contact roller holding member 19 via the piston rod 17, two The contact rollers 21a and 21b are brought into contact with the outer peripheral surface of the seam welding electrode wheel 5. 4 is applied to the tip bite holding member 25 via the piston rod 17 and the coil spring 23, so that the outer peripheral surface of the welding electrode wheel 5 has substantially the same width as that of the welding electrode wheel 5. As shown in the figure, insert the tip tool 27 having the width of
Contact with the outer peripheral surface of. According to the above embodiment, the outer peripheral surface of the seam welding electrode wheel 5 is cut by the tip tool 27. Reference numeral 29 denotes a shaft for rotatably attaching the chip bite 27 to the chip bite holding member 25.
This is a guide roller holding member guide mechanism attached to the seam welding electrode wheel cutting device main body 33. That is, when a force in the right direction in FIG. 4 is applied from the cylinder 15 through the piston rod 17,
It is guided by the contact roller holding member guide mechanism 31 and moves rightward in FIG. Similarly, when the above-described tip bite holding member 25 receives a rightward force in FIG. 4 from the cylinder 15 via the coil spring 23 and the piston rod 17, the inside of the space defined by the contact roller holding member 19 is moved. 4 moves to the right.

By using the seam welding electrode wheel cutting apparatus having the above-mentioned structure, the drawback of the apparatus shown in FIG.

However, by adjusting the resilience of the coil spring 23 interposed between the piston rod 17 and the tip bite holding member 25, the tip bite 27 may hit the outer peripheral surface of the seam welding electrode wheel 5. There is a possibility that so-called chattering occurs in the seam welding electrode wheel 5 due to being too strong, or there is a problem that the cutting tool cannot be cut because the contact of the tip tool 27 with the outer peripheral surface of the seam welding electrode wheel 5 is too weak. Further, since the tip tool 27 is brought into contact with the outer peripheral surface of the seam welding electrode wheel 5 by the pressure in the right direction in FIG. 4 applied from the cylinder 15, a desired cutting amount cannot be obtained. There is a problem that the control of arbitrarily changing the feed speed of FIG. 27 to the right in FIG. 4 cannot be performed.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above circumstances, and has as its object to accurately and reliably form a welding electrode wheel with a set cutting amount without complicated and time-consuming manual operation. An object of the present invention is to provide a highly reliable automatic welding electrode wheel shaping device capable of automatically cutting the outer peripheral surface.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is configured such that a contact / separation can be made with respect to an outer peripheral surface of a rotatable welding electrode wheel based on an input control signal. A cutting mechanism for cutting the outer peripheral surface of the welding electrode wheel, and an electric signal output unit that outputs a predetermined electric signal in response to detection of contact of the cutting mechanism with the outer peripheral surface of the welding electrode wheel; From the time when the predetermined electric signal is output from the electric signal output means, an electric signal indicating the cutting amount of the welding electrode wheel, which is substantially equal to the preset cutting amount threshold data, is input. And a cutting mechanism control means for controlling the cutting mechanism to be in contact with the outer peripheral surface of the welding electrode theory.

[0013]

In the above construction, when a control signal indicating that the outer peripheral surface of the welding electrode wheel should be brought into contact with the outer peripheral surface of the welding electrode wheel is output from the cutting mechanism control means to the cutting mechanism, the cutting mechanism is moved to the outer peripheral surface of the welding electrode wheel. Start moving toward. When the cutting mechanism contacts the outer peripheral surface of the welding electrode wheel by this movement, the electric signal output means outputs a predetermined electric signal indicating that the cutting mechanism has contacted the outer peripheral surface of the welding electrode wheel. The electric signal output from the electric signal output means is read by the cutting mechanism control means. After the point at which the cutting mechanism control means reads the electric signal, the cutting mechanism control means sends the control signal to the cutting mechanism so that the output of the electric signal is continued from the electric signal output means. Continue the output of

The fact that the output of the control signal is continued means that the cutting mechanism is in pressure contact with the outer peripheral surface of the welding electrode wheel, that is, the outer peripheral surface of the welding electrode wheel is cut by the cutting mechanism. It shows the state where it is. In this way, when the output of the above-described control signal is continued, when an electric signal substantially matching the preset cutting amount threshold data is input from the outside, the cutting mechanism control means: Instead of the above-described control signal, a control signal for causing the cutting mechanism to be separated from the outer peripheral surface of the welding electrode wheel is output. By the output of this control signal, the cutting mechanism which has been in pressure contact with the outer peripheral surface of the welding electrode wheel is separated from the outer peripheral surface of the welding electrode wheel, whereby the outer peripheral surface of the welding electrode wheel is cut by the cutting mechanism. The cutting operation will be completed.

That is, when an electric signal substantially matching the above-described cutting amount threshold data is input to the cutting mechanism control means, the cutting amount of the outer peripheral surface of the welding electrode wheel by the cutting mechanism is:
This is because the threshold value is reached, and if the cutting mechanism is kept in contact with the outer peripheral surface of the welding electrode wheel even after the time point, the cutting will be excessive.

Through the above-described process, the automatic cutting operation of the outer peripheral surface of the welding electrode wheel is performed by the automatic welding electrode wheel shaping apparatus according to the present invention.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an apparatus for automatically shaping a welding electrode wheel according to an embodiment of the present invention. An automatic shaping apparatus for a welding electrode wheel according to one embodiment of the present invention includes a contact detector 37 and a welding electrode wheel 3 as shown in FIG.
5, a cutting mechanism for cutting the outer peripheral surface, that is, a shaping tool holding mechanism 44, a motor drive circuit 39, a pulse generator 43, a cutting mechanism control means, that is, a speed control position command sequencer 45, an operation unit 47, and a display unit 49. Is provided.

The above-mentioned welding electrode wheel 35 is used for resistance welding such as seam welding, for example, and has a substantially disk shape having a predetermined thickness from the front surface to the rear surface in FIG. The welding electrode wheel 35 is rotatably supported at a predetermined speed in a clockwise direction in FIG.

The shaping byte holding mechanism 41 includes a shaping byte 4
1a, movable member 41b, shaping tool holding mechanism main body 41
c, a feed screw 41d, a speed reducer 41e, and an electric motor 41f. The shaping tool holding mechanism main body 41c is a casing formed such that the opening has a substantially square shape and the whole has a substantially rectangular parallelepiped shape. In other words, the shaping tool holding mechanism 41c is installed with its opening facing the outer peripheral surface side of the welding electrode wheel 35 so that the shape as viewed from the left direction in FIG. The width of the accommodation space defined by the opening and the shaping tool holding mechanism 41 is determined by the thickness of the welding electrode wheel 35 (that is, the thickness of the welding electrode wheel 35).
The width of the outer peripheral surface) is set to a length corresponding to the width of the outer peripheral surface, and the housing space portion has a substantially rectangular parallelepiped movable member having a lateral width corresponding to the thickness of the welding electrode wheel 35 (ie, the width of the outer peripheral surface). 41b is inserted slidably in the left-right direction in FIG.
The right end of the shaping tool holding mechanism 41c in FIG.
An electric motor 41f, a pulse generator 43, and a reduction gear 41e are mounted and fixed respectively. A through hole (not shown) in which a female screw is formed in the inner wall surface is provided substantially at the center of the inner wall surface at the back of the housing space portion (that is, the inner wall surface at the right end in FIG. 1 in the housing space portion). I have. One end of the through hole is mechanically linked to the speed reducer 41e,
A feed screw 41d, the other end of which is screwed with the recess of the movable member 41b, is screwed. The feed screw 4
1d is positive / negative due to the rotational force of the electric motor 41f, which is transmitted through the speed reducer 41e and is reduced to a predetermined rotational speed or less.
A reverse rotation operation is performed.

The above-mentioned movable member 41b is made of an insulating material having a certain strength or more, and has a predetermined size at an end on the side facing the outer peripheral surface of the welding electrode wheel 35 as shown in the figure. A concave portion is formed, and a shaping tool 41a is inserted into the concave portion. The width of the concave portion is set to a length corresponding to the thickness of the welding electrode wheel 35, and the shaping tool 41a is attached and fixed to the concave portion so that the shaping tool 41a does not slip off from the movable member 41b. . That is, the shaping tool 41a has a cross-sectional shape as shown in FIG. 1, and its lateral width is set so that the outer peripheral surface of the welding electrode wheel 35 can be simultaneously cut over the entire width.
The length is set according to the width of the outer peripheral surface of the welding electrode wheel 35. It is assumed that the shaping tool 41a is made of a metal material having a higher hardness than at least the metal material forming the welding electrode wheel 35 in terms of its function.

In this embodiment, when the motor 41f is rotating forward, the shaping tool 41a and the movable member 41b are rotated.
1 is fed by the feed screw 41d in the left direction in FIG. When the motor 41f is rotating in the reverse direction, the shaping tool 4
1a and the movable member 41b are fed by the feed screw 41d in the right direction in FIG. 1, that is, in the direction away from the outer peripheral surface of the welding electrode wheel 35. The electric motor 41f has a speed control position command sequencer (hereinafter simply referred to as “sequencer”).
Based on a motor drive command signal output from 45 to the motor drive circuit 39 at an arbitrary rotational speed.
It is designed to rotate in reverse. Although various motors can be adopted as the motor 41f, in this embodiment, the welding electrode wheel 3 is used.
In order to perform highly accurate round processing in the cutting work of the outer peripheral surface of No. 5, a servo motor was adopted. Therefore, the circuit configuration of the electric motor drive circuit 39 is also suitable for use as a servo motor driver.

The pulse generator 43 includes the electric motor 4
3 is mounted coaxially with the rotating shaft of
And outputs a square wave pulse signal corresponding to the rotation amount to the sequencer 45. In FIG. 1, all the members of the shaping tool holding mechanism 41 are indicated by solid lines in order to clarify the internal configuration.

The contact detector 37 includes a shaping tool 41a,
A voltage signal of a predetermined logic level is output to the sequencer 45 in response to the detection of the contact with the outer peripheral surface of the welding electrode wheel 35. The outer periphery of the welding electrode wheel 35 is output via the probe 37a of the contact detector 37. The surface is electrically in contact with the shaping tool 41a via the probe 37b of the contact detector 37, respectively. That is, the contact detector 37 is formed from the welding electrode wheel 35 formed by the contact between the shaping tool 41a and the outer peripheral surface of the welding electrode wheel 35 as shown in the drawing.
A predetermined voltage level signal is output by detecting a current flowing through a closed loop that reaches the welding electrode wheel 35 via the shaping tool 41a. The welding electrode wheel 35
From a power supply (not shown). Since a voltage of 12 V is applied and the closed loop is formed, a predetermined direct current flows from the welding electrode wheel 35 toward the contact detector 37.

Since the voltage and the current are on the order, when the shaping tool 41a approaches the outer circumferential surface of the welding electrode wheel 35, dielectric breakdown of the atmosphere occurs, and the shaping tool 41a and the outer circumferential surface of the welding electrode wheel 35 are in contact with each other. There is no possibility that a discharge will occur during this time. However, in the present embodiment, the contact detector 37
And a device provided with a protection resistor for protecting the internal circuit element from an inrush current. This is because this kind of contact detector is constituted by semiconductor switching elements such as bipolar switching transistors, for example, so that it is necessary to prevent the semiconductor switching elements from being destroyed by an inrush current.

The display unit 49 performs a display operation under the control of the sequencer 45 based on various display command signals output from the sequencer 45. That is, the display unit 49
Is an image of various data such as cutting amount data of the outer peripheral surface of the welding electrode wheel 35 by the shaping tool 41a, time data when the welding electrode wheel 35 is used for welding work, and cutting amount threshold data in one cutting operation. The information is displayed in the form of information.

The operating unit 47 includes a shaping tool holding mechanism 41.
Keys for selectively setting the amount of cutting of the outer peripheral surface of the welding electrode wheel 35 in one cutting operation, including a key for inputting an automatic shaping work start command input by the user, and a shaping tool holding mechanism 4
1, a key group for selectively setting the cutting speed, a display command input key group used for displaying various data on the display unit 49, and an outer peripheral surface of the welding electrode wheel 35 by the automatic shaping apparatus according to the present embodiment. A command input key (not shown) for interrupting the cutting operation is provided. When any one of the various keys is pressed by the operator, a predetermined voltage level signal is input to the sequencer 45 from the pressed key.

The sequencer 45 includes an arithmetic processing unit 45a
And a storage unit 45b.

The storage unit 45b stores not only a control program and the like but also various data necessary for performing an automatic shaping operation of the welding electrode wheel 35. The storage unit 45b stores the corresponding data in response to the data read request output from the arithmetic processing unit 45a.
Output to Examples of the various data stored in the storage unit 45b include, for example, data relating to a limit time (hereinafter, referred to as “limit time data”) that can be used for welding work without cutting the welding electrode wheel 35, Cutting amount threshold data in one cutting operation set corresponding to the limit time data (the cutting amount threshold data in which the data is the maximum value of the cutting amount in one cutting operation) is 1, indicated by reference numeral L _1), in a short time domain than the limit time, a plurality of welding time data is set every predetermined time interval, to each of the plurality of welding time data The plurality of cutting amount data set correspondingly, the plurality of cutting speed data by the shaping tool holding mechanism 41, and the plurality of cutting speed data are set corresponding to each of the plurality of cutting speed data. The feed amount data of the feed screw 41b (these feed amount data are values obtained by correcting the rotation amount of the electric motor 41f by the reduction ratio of the speed reducer 41e), and that the shaping tool 41a exists at the home position. Numerical data (for example, a feed amount of the feed screw 41d of 0) is shown.

The relationship between the limit time data and the plurality of welding operation time data is, for example, T as the limit time,
Assuming that a time interval at the time of setting each welding operation time data is t, and the time interval t is obtained by dividing the above T into four equal parts, each welding operation time is

[0031]

(Equation 1)

## EQU2 ## Also, the relationship between the amount of cutting threshold data and a plurality of cutting amount data, for example, the amount of cutting threshold and L _1, each cutting amount data,
The cutting amount corresponding to the welding operation time t is 1, the cutting amount corresponding to 2t is 2l, and the cutting amount corresponding to 3t is 3l, 4t.
Assuming that the cutting amount corresponding to is 4 l, from the relationship between the limit time data and each welding operation time data described above,

[0033]

(Equation 2)

Can be represented by

The arithmetic processing unit 45a includes various command information output from the operation unit 47, a voltage level signal output from the contact detector 37, a count value of a square wave pulse signal output from the pulse generator 43, and a storage unit 45b. The motor 41f, the display unit 49, and the like are controlled by executing a predetermined arithmetic processing operation based on various data and the like stored in the. When recognizing that the voltage level signal output from the operation unit 47 indicates, for example, the limit time T, the arithmetic processing unit 45a determines that the cutting amount in one cutting operation corresponds to the limit time T. it is determined that the amount threshold L _1. When the arithmetic processing unit 45a recognizes that the voltage level signal output from the operation unit 47 indicates, for example, the welding operation time 2t, the amount of cutting in one cutting operation corresponds to the welding operation time 2t. Cutting amount

[0036]

(Equation 3)

Is determined. The arithmetic processing unit 45a
When the limit time T and the cutting amount threshold L1 are set in _one cutting operation, the above data are set in an internal counter (not shown), and a display unit is displayed to display the data in an image. A display command signal is output to the display 49. In one cutting operation, for example, when the welding operation time 2t and the cutting amount 21 are set in one cutting operation, the internal counter (not shown) is used.
In a 2t is a difference value between the limit time T and the welding time 2t, and 2l is a difference value of the cutting amount threshold L ₁ and the cutting amount 2l with respective sets, each of the above data A display command signal is output to the display unit 49 to display an image. The reason why the set welding operation time data and the cutting amount data are displayed as images on the display unit 49 is that the operator should be careful not to cut the welding electrode wheel 35 excessively. It is to evoke.

When the arithmetic processing unit 45a recognizes that the voltage level signal output from the operation unit 47 indicates, for example, the set value of the cutting speed by the shaping tool holding mechanism 41, the feed screw corresponding to the set value is set. The feed amount data of 41b is read from the storage unit 45b. The feed amount data has already been described in detail. After performing the above operations, the arithmetic processing unit 45a outputs a predetermined motor drive command signal to the motor drive circuit 37 so that the shaping tool 41a contacts the outer peripheral surface of the welding electrode wheel 35. In response to the output of the motor drive command signal, the motor 41f starts normal rotation at an arbitrary rotation speed, and sends the movable member 41b leftward in FIG. 1 via the feed screw 41d. The arithmetic processing unit 45a includes the electric motor 41
When f starts the forward rotation, an up / down counter (not shown) for detecting the current position of the built-in shaping tool 41a is set to an up-count mode.
Until the contact detector 37 outputs a predetermined voltage level signal, the square wave pulse signal output from the pulse generator 43 is incremented. Arithmetic processing unit 45a
When a voltage signal indicating that the shaping tool 41a has come into contact with the outer peripheral surface of the welding electrode wheel 35 is output from the contact detector 37, a built-in counter (not shown) for detecting the cutting amount is provided. ) To drive the pulse generator 4
The increment operation of the square wave pulse signal output from 3 is started. The count value of a counter (not shown) for detecting the cutting amount is determined by the arithmetic processing unit 45a to be equal to the cutting amount data set in one cutting operation through the process as described above. Reset when determined.

The cutting speed of the outer peripheral surface of the welding electrode wheel 35 by the shaping tool 41a is determined by the feed amount of the movable member 41b by the feed screw 41d to the left in FIG. That is, if the feed amount is large, the pressing force of the shaping tool 41a against the outer peripheral surface of the welding electrode wheel 35 is correspondingly increased, and the cutting speed is increased. The control of the cutting speed can also be performed by variably adjusting the rotation speed of the welding electrode wheel 35 together with the feed amount (in this specification, the rotation speed of the welding electrode wheel 35 by the arithmetic processing unit 45a). The description of the mechanism relating to the control is omitted). The feed of the movable member 41b in the leftward direction in FIG. 1 by the arithmetic processing unit 45a is continued until the actual cutting amount matches the cutting amount data. When the shaping tool 41a is separated from the outer peripheral surface of the welding electrode wheel 35, the control opposite to the above-described control of the contact is performed. That is, the positive control is performed for each phase of the motor drive circuit 39. By applying a drive command signal in reverse order to the rotation operation,
The motor 41f is rotated in the reverse direction, and the shaping tool 41 is rotated.
The up / down counter (not shown) for detecting the current position a is set to a down count mode, and when it is recognized that the count value of the counter has become 0, it is determined that the shaping byte 41a has returned to the home position. Then, the reverse rotation operation of the electric motor 41f is stopped.

When the arithmetic processing unit 45a recognizes that the voltage level signal output from the operation unit 47 is, for example, a display command for displaying various data on the display unit 49, the corresponding processing unit 45a displays the corresponding data. Display output. Further, when the arithmetic processing unit 45a recognizes that the voltage level signal output from the operation unit 47 is, for example, a command for interrupting the cutting operation of the outer peripheral surface of the welding electrode wheel 35, the arithmetic processing unit 45a welds the shaping tool 41a. An electric motor drive command signal for reversely rotating the electric motor 41f is output to the electric motor drive circuit 39 so that the electric motor 41f is separated from the outer peripheral surface of the electrode wheel 35.

Next, the control operation of the above configuration will be described with reference to the flowchart of FIG.

When the operator turns on the drive power supply (not shown) of the automatic shaping apparatus having the structure shown in FIG. 1, the arithmetic processing section 45a starts a series of control operations. That is, by referring to the count value of the up / down counter (not shown) for detecting the current position of the shaping byte 41a and recognizing that this count value is 0, the shaping byte 41a
Is determined to be in the home position. on the other hand,
When it is recognized that the count value is not 0, the motor 41f is rotated in the reverse direction until the count value becomes 0 (steps 101 and 103). Step 101
When it is determined that the shaping tool 41a is at the home position, byte feed amount data corresponding to the cutting speed set by the manual operation of the key group of the operation unit 47 by the operator is read from the storage unit 45b, and the read feed is read out. The electric motor 41f is rotated forward based on the amount data. As a result, the shaping tool 41a is sent out from the home position toward the outer peripheral surface of the welding electrode wheel 35 (step 105). The feeding operation of the shaping tool 41a described in Step 105 is continued even after the predetermined voltage level signal is output from the contact detector 37. When the contact detector 37 outputs a voltage level signal indicating that the shaping tool 41a has come into contact with the outer peripheral surface of the welding electrode wheel 35 (step 107), the voltage level signal output from the operation unit 47 is changed to the limit time. Or T
Alternatively, it is determined whether the time indicates the welding operation time (t to 3t) (step 109). In step 109, if it is determined that indicates the limit time T, the arithmetic processing unit 45a reads the amount of cutting threshold data L ₁ stored in the storage unit 45b corresponds to the limit time data T, step 105 In the byte feed amount obtained in, the shaped byte 41
The pressure contact state of a with respect to the welding electrode wheel 35 is continued (step 111, step 113).

The count value of the square-wave pulse signals from the pulse generator 43 by the counter for detecting the amount of cutting which is built in the arithmetic processing unit 45a (not shown) recognizes that match the values of the L ₁ (Step 1
15) Rotate the electric motor 41f in the reverse direction to
a is separated from the outer peripheral surface of the welding electrode wheel 35 (step 117). That is, at step 115, the amount of cutting of the outer circumferential surface of the welding electrode wheels 35 by shaping byte 41a, the cutting amount because they threshold data L ₁ and substantially matches, the separating operation of the shaping byte 41a at step 117 If not performed, the outer peripheral surface of the welding electrode wheel 35 will be excessively cut. Electric motor 4 described in step 117
The operation of reversely rotating 1f is continued until the count value of the up / down counter (not shown) becomes 0 (steps 119, 121, 123). The cutting amount data (L ₁ , l, 2 l, 3 l) and the time data (T, t, 2 t, 3 t) in which the welding electrode wheel 35 was used for welding work are not excessively cut off the outer peripheral surface of the welding electrode wheel 35. As described above, in order to draw the operator's attention, the data is displayed as image data on the display unit 49, but various data other than the above are displayed as image data on the display unit 49 in response to the output of the display command from the operation unit 47. (Step 123,
Step 125).

On the other hand, if it is determined in step 109 that the operation time indicates, for example, the welding operation time 2t, the arithmetic processing unit 45a stores the data in the storage unit 4 corresponding to the welding operation time data 2t.
5b is read out and the shaping tool 41a is read out using the byte feed amount obtained in step 105.
Is kept pressed against the welding electrode wheel 35 (step 127, step 129). When it is recognized that the count value of the square wave pulse signal from the pulse generator 43 by the counter (not shown) for detecting the cutting amount built in the arithmetic processing unit 45a substantially matches the value of 2l (step 131). ), Step 117 described above.
Will be shifted to. In this case, a counter (not shown) built in the arithmetic processing unit 45a described above includes:
Difference value between limit time data T and welding work time 2t: 2t
And cutting amount threshold data L ₁ and the cutting amount 2l and the difference value: 2l are respectively held. These two difference value data 2
As described above, t and 2l are displayed on the display unit 49 as image data.

As described above, according to the embodiment of the present invention, when the outer peripheral surface of the welding electrode wheel 35 is cut, the operator can operate the key group provided on the operation unit 47 to obtain a desired cutting amount. And the desired cutting speed can be set,
Based on the set cutting amount and cutting speed, there is no so-called chattering in the welding electrode wheel 35, no biting of the shaping tool 41a, or excessive cutting, and the like. High-precision cutting work of the surface can be performed automatically, and cutting with high roundness has become possible.

Further, since the amount of cutting in one cutting operation can be selectively set, the welding electrode wheel 35 can be welded at a fixed amount of cutting before the welding electrode wheel 35 is used up to the limit time required for the cutting operation. The outer peripheral surface of the electrode wheel 35 can be cut. In addition, during the cutting operation, since the time when the welding electrode wheel 35 is used for the welding operation and the cutting amount data corresponding to the time are displayed as image data on the display unit 49, excessive cutting is performed for the operator. You can always call attention to avoid it.

The above description relates to one embodiment according to the present invention, and does not mean that the present invention is limited to only the above content. For example, in one cutting operation, a cutting amount threshold is set, or
In setting the cutting amount smaller than the set value, in the above-described embodiment, the time used for the welding work corresponding to each of the data is set, but the data is set directly. You can do it.
For detecting whether or not the shaping tool 41a is in contact with the outer peripheral surface of the welding electrode wheel 35, an optical sensor such as a photocoupler can be used instead of the contact detector 37, for example.

[0048]

As described above, according to the present invention,
From the time when the predetermined electric signal is output from the electric signal output means, an electric signal indicating the cutting amount of the welding electrode wheel, which is substantially equal to the preset cutting amount threshold data, is input. Until the cutting mechanism is controlled so as to be in contact with the outer peripheral surface of the welding electrode wheel, without the need for complicated and time-consuming manual operation, accurate with the set cutting amount, It is possible to provide a highly reliable automatic welding electrode wheel shaping apparatus capable of automatically and reliably cutting the outer peripheral surface of the welding electrode wheel.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic welding electrode wheel shaping device according to one embodiment of the present invention.

FIG. 2 is a flowchart showing a control operation of the configuration shown in FIG.

FIG. 3 is an explanatory view of a seam welding electrode wheel cutting device according to the prior art.

FIG. 4 is an explanatory view of another seam welding electrode wheel cutting device according to the prior art.

[Explanation of symbols]

 35 welding electrode wheel 37 contact detector 39 motor drive circuit 41 shaping tool holding mechanism 41a shaping tool 41b movable member 41c shaping tool holding mechanism main body 41d feed screw 41e reduction gear 41f motor 43 pulse generator 45 speed control position command sequencer 45a arithmetic processing unit 45b storage unit

Claims (3)

(57) [Claims] 1. A cutting mechanism for cutting an outer peripheral surface of a welding electrode wheel, wherein the cutting mechanism is configured to be capable of contacting / separating from an outer peripheral surface of a rotatable welding electrode wheel based on an input control signal. An electric signal output unit that outputs a predetermined electric signal in response to detection of contact of the cutting mechanism with the outer peripheral surface of the welding electrode wheel, and when a predetermined electric signal is output from the electric signal output unit, An electric signal indicating the cutting amount of the welding electrode wheel, and until the electric signal substantially matching the preset cutting amount threshold data is input, the cutting mechanism is moved to the outer peripheral surface of the welding electrode theory. An automatic shaping device for a welding electrode wheel, comprising: a cutting mechanism control means for controlling a state of contact with a cutting mechanism. 2. The automatic shaping device for a welding electrode wheel according to claim 1, wherein the electric signal output means is a contact detector electrically connected to the welding electrode wheel and the cutting mechanism, respectively. The contact detector outputs an electric signal indicating the contact to the cutting mechanism control means by detecting a current flowing through a closed loop formed when the cutting mechanism contacts the outer peripheral surface of the welding electrode wheel. An automatic shaping device for welding electrode wheels, characterized in that: 3. The apparatus for automatically shaping a welding electrode wheel according to claim 1, further comprising: display means for performing a display operation under the control of said cutting mechanism control means. The cutting amount threshold value data is set to a maximum value of the cutting amount in one cutting operation, and a welding operation time corresponding to the maximum value is set as a limit time in which the cutting operation is unnecessary, in a time region shorter than the limit time. The cutting amount data corresponding to each of these welding operation times is set for each of the plurality of welding operation times thus set, and the cutting mechanism control unit performs cutting using any of the respective cutting amount data. Sometimes, a difference value between the maximum value data and the used cutting amount data, and a difference value between the limit time data and the used cutting amount data and the corresponding welding work time data. Is held so that a difference operation can be performed between the same type of newly input data and the held data is displayed on the display means. Automatic shaping device.