JPH0413570A - Channelizing device - Google Patents

Abstract

PURPOSE:To keep the notch depth of a work constant, by finding the thermal displacement quantity to a detection temperature from the thermal displacement quantity of between the work and grindwheel to the preset temperature a coolant discharging port and providing a notch quantity setting control unit which controls a notch table with feedback. CONSTITUTION:A temperature detector 9 provided at the coolant discharging part of a coolant nozzle 7 detects the temperature of the coolant discharging part on each channeling of a work 5, delivering this detection value to a grindwheel shaft notch quantity setting control unit 11 of the control unit which controls a channeling device 1 whole body. In this control unit 11, the comparison of the detected temperature value delivered from the temperature detector 9 and the temperature of the channeling start time (initial) temperature is performed, the correction value of the time when the setting of the grindwheel shaft notch quantity in the following channeling is found and this correction value is output as a feedback value so as to deny the relative displacement by the thermal displacement of between the work 5 and grindwheel 2.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a grooving device for grooving various heads such as magnetic memory heads, and in particular, it is capable of keeping the cutting depth constant even if thermal displacement occurs between the workpiece and the grindstone. This invention relates to a grooving device.

[Conventional technology]

Conventionally, when grooving various heads such as magnetic memory heads, a feed table on which the workpiece is placed, an indexing table that moves intermittently at the same interval as the groove pitch to be formed on the workpiece, and the high-value table are used. The grinding wheel is equipped with a cutting table that makes a cut to a predetermined depth on a grinding wheel fixed to a grinding wheel shaft that is attached to the grinding wheel and can be rotated freely, and a coolant nozzle that sprays coolant liquid near the tip of the grinding wheel shaft. This is done with a grooving machine that grooves the workpiece while injecting coolant liquid from a coolant nozzle into the grooved part. In various heads such as magnetic memory heads, the accuracy of the depth of the processed groove has a subtle effect on its performance, so the depth of the groove is a very important factor. When such a grooving device rotates a grindstone to groove a workpiece, the grooving device cools the grooving portion by injecting coolant liquid from a coolant nozzle to the grooving portion. However, when a grindstone is rotated to groove a workpiece, heat is generated by a moving part such as a motor and by sliding of a guide part, causing thermal displacement in each mechanical component. The thermal displacement occurring in each mechanical component stops when grooving is started and the amount of heat generated and the amount of heat radiated to the atmosphere are balanced. Therefore, in response to this thermal displacement that occurs in each mechanical component, the cutting direction (groove depth direction) of the grinding wheel shaft can be kept constant by using materials and structures with low thermal expansion for each mechanical component. Such a configuration is adopted.

[Problem to be solved by the invention]

However, when grooving a workpiece, the coolant fluid injected from the coolant nozzle into the grooving area is circulated and used, so the temperature of the coolant fluid increases due to the frictional heat generated when the grinding wheel and the workpiece are cut. It will rise gradually. This temperature rise in the coolant liquid causes thermal displacement between the workpiece and the grindstone, and the depth of grooving into the workpiece changes from the originally set value. As described above, the conventional grooving apparatus has the problem that thermal displacement occurs between the workpiece and the grindstone even if sufficient consideration is given to the machine configuration. The present invention detects the temperature rise of the coolant between the workpiece and the grinding wheel, determines the amount of thermal displacement between the grinding wheel and the workpiece based on the temperature information, and uses this amount of thermal displacement to set the amount of movement of the cutting table. A grooving device that can maintain the cutting depth constant without causing fluctuations in the machining depth even if thermal displacement occurs between the workpiece and the grindstone by adding and controlling the value as a correction value. is intended to provide. [Means for Solving the Problem 1] The present inventor has determined that the temperature of the coolant liquid injected from the coolant nozzle ( Through experiments, we have found that this depends on the temperature of the coolant liquid spout (which is the same as the temperature of the coolant liquid spout of the coolant nozzle), leading to the present invention. Therefore, the present invention detects the temperature change of the coolant liquid injected from the coolant nozzle by detecting the temperature of the coolant liquid discharge part of the coolant nozzle, and heats the workpiece and grindstone based on the temperature change of the coolant liquid. The amount of displacement is determined, and the amount of thermal displacement is used as a correction value to perform feedback control on the amount of cut into the workpiece by the grindstone. That is, in order to achieve the above object, the grooving apparatus of the present invention includes a feed table on which a workpiece is placed and moves back and forth in a predetermined direction, and a feed table that moves in a direction perpendicular to the direction of movement of the feed table. an indexing table that moves intermittently at preset intervals; a cutting table that rotatably supports a grindstone shaft to which a grindstone is fixed; a cutting table that is movably supported by the index table so as to be movable in the cutting direction of the grindstone; and a grindstone shaft. Equipped with a coolant nozzle that sprays coolant liquid near the tip. In a grooving device that grooves a workpiece while rotating the grindstone and injecting coolant fluid from a coolant nozzle to a groove machining section, a temperature detector is provided at the coolant fluid discharge section of the coolant nozzle, and the temperature The temperature of the coolant outlet is detected by a detector, and the amount of thermal displacement with respect to the inspection temperature is determined from the amount of thermal displacement between the workpiece and the grinding wheel with respect to the preset temperature of the coolant outlet. The present invention is characterized in that a cutting depth setting control device is provided for performing feedback control on the cutting table.

[Effect]

A temperature sensor installed at the coolant discharge part of the coolant nozzle detects the temperature of the coolant discharge part each time a groove is machined on the workpiece, and this detected value is sent to the grindstone of the control device that controls the entire grooving machine. Sends to shaft cutting amount setting control device. This grinding wheel spindle depth of cut setting control device compares the detected temperature value sent from the temperature sensor with the temperature at the start of grooving (initial stage), and determines the cutting speed of the grinding wheel spindle in the next grooving process. A correction value is obtained when setting the amount, and this correction value is output as a feedback value so as to cancel out the relative displacement due to thermal displacement between the workpiece and the grindstone. Therefore, according to the present invention, it is possible to cancel out the relative displacement due to thermal displacement caused by the temperature rise of the coolant between the workpiece and the grinding wheel, and the cutting depth of the workpiece can be adjusted without causing fluctuations in groove depth machining. can be kept constant. [Example 1] Hereinafter, an example of the present invention will be described. FIG. 1 shows an embodiment of a grooving apparatus according to the present invention. In the figure, 20 is the bed of the grooving device 1. A motor 15 is supported by the bed 2o. Reference numeral 14 denotes an indexing table, which is placed on the bed 20 so as to be movable in the direction of arrow C, and is connected to the motor 15 via a screw feeding mechanism (not shown). A motor 13 is supported by an indexing table 14. Reference numeral 12 denotes a cutting table, which is supported by the indexing table 14 so as to be movable in the direction of arrow B, and is connected to the motor 13 via a screw feeding mechanism (not shown). 4 is a spindle head, which is supported by the cutting table 12. 3
is a grindstone shaft, which is rotatably supported by a spindle head 4 and directly connected to a motor (not shown). 2 is a grindstone, which is fixed to a grindstone shaft 2. 6 is. A feeding table is supported on the bed 20 so as to be movable in the direction of arrow A. A workpiece 5 is placed and fixed on a feed table 6. 7 is a nozzle, which is fixed to the spindle head 4. Reference numeral 8 denotes a coolant liquid supply device that supplies coolant liquid to the nozzle 7 and collects the coolant liquid discharged from the nozzle 7. Reference numeral 9 denotes a temperature detector such as a thermistor, which is fixed to the tip of the nozzle 7 and detects the temperature of the coolant liquid through the nozzle 7. 10 is a temperature detection device;
It is connected to a temperature detector 9. Reference numeral 11 denotes a cutting depth control device, which is connected to the temperature detection device 10. A control device 16 controls the driving of the motors 13 and 15. With this configuration, when a drive command is issued to the motor 15 from the control device 16, the motor 15 operates based on the command from the control device 16, moves the indexing table 14, and moves the grindstone 2 to the workpiece 5. Move upward to face the processing position of the workpiece 5. and. The grindstone shaft 3 is rotated by a motor (not shown), and the motor 13 is operated to move the cutting table 12.
The grindstone 2 is lowered to the processing position of the workpiece 5 and groove processing is started. In this state, based on the command from the control device 16,
The feed table 6 is moved to move the grindstone 2 in the cutting direction. When the grinding wheel 2 cuts into the workpiece 5 to a predetermined position, the control device 16 issues a drive command to the motor 13, activates the motor 13, moves the cutting table 12 upward, and raises the grinding wheel 2. Then, machining of one groove is completed. When machining of one groove is completed, the temperature detection device 10 converts an output value corresponding to the temperature detected by the temperature detector 9 into an electric signal and supplies it to the cutting depth control device N11. Then, the cutting depth control device 11 calculates the correction amount of the cutting depth of the grindstone 2 from the correction amount table showing the correction amount of the cutting depth of the grindstone 2 with respect to the preset coolant temperature, and calculates the correction amount. is output to the control device W16. When the correction amount is sent from the cutting depth control device 11, the control device 16 corrects the active command value to be applied to the motor 13 based on this correction amount. While repeating such operations, necessary groove machining is performed one by one. Therefore, according to this embodiment, the temperature rise of the coolant liquid between the workpiece 5 and the grinding wheel 2 is detected, the amount of thermal displacement between the grinding wheel and the workpiece is determined based on the temperature information, and the amount of thermal displacement is calculated as follows.
By controlling the addition of a correction value to the set value of the travel distance of the cutting table 6, even if thermal displacement occurs between the workpiece 5 and the grinding wheel 2, the cutting depth can be adjusted without causing any fluctuation in the machining depth. can be kept constant. [Effects of the Invention] Since the present invention is configured as described above, the relative displacement caused by the thermal displacement between the workpiece and the grinding wheel at the start of grooving and after machining multiple grooves is calculated by adjusting the cutting position of the cutting table. By adding a correction value to the set value, it can be canceled out, and even if thermal displacement occurs due to a rise in the temperature of the coolant between the workpiece and the grinding wheel, the workpiece can be cut into the workpiece without causing fluctuations in groove depth machining. Depth can be kept constant.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a grooving apparatus according to the present invention. 1・・・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・ Grooving equipment 2・・・・・・・・・・・・・・・・・・・・・
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・・・・・・・・・Whetstone 3・・・・・・・・・・・・
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・・・・・・・・・・・・・・・・Whetstone shaft 4・・・・
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・・・・・・・・・・・・・・・・・・・・・ Spindle head 5・・・・・・・・・・・・・・・・・・・・・
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・・・・・・Processed product 6・・・・・・・・・・・・・・・
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・・・・・・Feeding table 7・・・・・・・・・・・・
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・・Coolant nozzle 8・・・・・・・・・・・・・・・・
・・・・・・・・・・・・・・・・・・ Coolant liquid supply device 9 ・・・・・・・・・・・・・・・・・・・・・
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...Temperature detector 13, 15 20...

Claims (1)

[Claims] (1) A feed table on which a workpiece is placed and moves back and forth in a predetermined direction, an index table that moves intermittently at preset intervals in a direction perpendicular to the direction of movement of the feed table, and a grindstone are fixed. The grinding wheel is rotatably supported by the grinding wheel, a cutting table supported by the index table so as to be movable in the cutting direction of the grinding wheel, and a coolant nozzle for spraying coolant near the tip of the grinding wheel. In an introduction machining device that grooves the workpiece while rotating and spraying coolant liquid from the coolant nozzle to the groove machining section,
A temperature detector is provided at the coolant discharge part of the coolant nozzle, and the temperature of the coolant discharge port is detected by the temperature detector, and the heat between the workpiece and the grinding wheel is determined based on the preset temperature of the coolant discharge port. An introduced machining device characterized by being provided with a depth of cut setting control device that determines the amount of thermal displacement with respect to the detected temperature from the amount of displacement and performs feedback control of the notch table.