JPH0775947A - Throw-away tip grinding method and device - Google Patents

Abstract

PURPOSE:To grind throw-away tips efficiently by feeding workpieces or dressing wheels alternatively into carrier plates, thereby dressing grinding wheels as occasion calls to prevent them from being plugged. CONSTITUTION:An abrasive grain layer 3 is provided on one surface of an annular base metal 2 in a diamond wheel 1. Plural carrier plates 4 each of which has a hole at the center are disposed between a vertical pair of diamond wheels 1. Each carrier plate 4 is provided with plural holding holes 6 formed to insert and hold ground material (throw-away tips) 5, and holding holes 8 formed separately from the holding holes 6 so as to insert and hold dressing wheels 7 for dressing the abrasive grain layer 3. These carrier plates 4 revolve while auto-rotating between the diamond wheels 1 so as to polish the top and back of the ground material 5 uniformly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away tip grinding method and a grinding machine used therefor.

[0002]

2. Description of the Related Art In the manufacturing process of throw-away chips, the upper and lower surfaces of sintered throw-away chips are processed by a tool grinder to finish them to a predetermined thickness. Further, in the tool grinder for performing the above processing, since the deterioration of the processing performance due to the chips generated by the processing being clogged in the grinding wheel cannot be avoided, dressing the wheel every time a certain amount is processed. It is necessary to remove the chips.

As a conventional technique for efficiently performing the above dressing, there is a "grinding method in a grinding machine" described in Japanese Patent Publication No. 2-30831. In this grinding method, a carrier plate for holding a plurality of workpieces between upper and lower grinding wheels is made to hold a dressing wheel instead of a part of the plurality of workpieces. is there. In this grinding method, a dressing wheel set to a thickness larger than the work material by a predetermined amount is inserted into a hole that has the same planar shape as the work material and is provided in the carrier plate to hold the work material. Incidentally, prior to the grinding of the work material, the dressing wheel is brought into contact with the grinding wheel. That is, after the chips on the surface of the grinding wheel are removed by contacting the surface of the grinding wheel with a dressing wheel having a thickness slightly larger than that of the work material, a method of bringing the grinding wheel into contact with the work material is adopted. There is.

[0004]

However, in the above-mentioned prior art, the dressing is insufficient because the dressing is always performed before the grinding process regardless of whether the grinding wheel requires dressing or not. Become
Alternatively, there is a problem that the life of the grinding wheel is shortened by excessive dressing.

Further, the dressing whetstone used is
Since it is necessary to have a very special shape that the work piece has the same planar shape as that of the work piece and the thickness is increased by a predetermined amount, depending on the shape of the work material (the work piece provided on the carrier plate). The drawback was that many types of dressing wheels had to be prepared (depending on the shape of the hole for holding the work material).

The present invention has been made in view of the above circumstances, and it is an object of the present invention to maintain a grinding wheel in an optimum state at an optimum timing and without using a dressing wheel having a special shape. .

[0007]

In order to achieve the above object, the invention of claim 1 is to rotate a pair of upper and lower grinding wheels to thereby hold a work material held by a carrier plate provided therebetween. In a grinding method of a throw-away tip for grinding, a step of rotating a grinding wheel while holding a work material on the carrier plate, and a step of rotating the grinding wheel while holding a dressing wheel on the carrier plate It is intended to do and as an alternative.

According to a second aspect of the present invention, a pair of upper and lower grinding wheels, a carrier plate which is provided between the grinding wheels and holds the work material in a hole having the same plane shape as that of the grinding plate, and the carrier plate are covered. In a throw-away tip grinding device including a first supply means for supplying a cutting material, the carrier plate is provided with a holding hole having the same planar shape as a dressing grindstone for dressing the grinding grindstone. Is.

According to a third aspect of the present invention, in the second aspect, the second supply means for supplying the dressing grindstone to the holding hole and the first and second supply means are controlled to be machined on the carrier plate. Control means for selectively supplying the material or the dressing grindstone.

According to a fourth aspect of the present invention, in the third aspect, the control means selectively operates the first or second supply means based on the measurement result of the driving state of the grinding wheel. It is the one.

According to a fifth aspect of the present invention, in any one of the second to fourth aspects, the holding hole for the dressing grindstone in the carrier plate has a planar shape different from that of the hole formed for holding the work material. It was done like this.

[0012]

According to the above construction, dressing can be easily performed by mounting a dressing grindstone on the carrier plate of the tool grinder instead of the work material. Further, the necessity of dressing can be easily determined based on the measured value of the driving state of the grinding wheel.

[0013]

[Example] Reference numeral 1 is a diamond wheel (grinding wheel)
This diamond wheel 1 has an annular base metal 2
The abrasive grain layer 3 is provided on one of the surfaces. A pair of upper and lower diamond wheels 1 are provided so that the abrasive grain layers 3 face each other, and are rotationally driven in mutually opposite directions as indicated by arrows in the figure.

A plurality of carrier plates 4 having a hole at the center are arranged between the diamond wheels 1. As shown in the figure, a plurality of holding holes 6 for inserting and holding a work material (throwaway tip) 5 are formed in these carrier plates 4. In addition to the holding hole 6, a holding hole 8 for inserting and holding a dressing grindstone 7 for dressing the abrasive grain layer 3 is formed. Then, the carrier plate 4 revolves while rotating between the diamond wheels 1 to uniformly polish the front and back surfaces of the work material 5.

In the vicinity of the diamond wheel 1, work supply means 10 and grindstone supply means 11 for supplying the work material 5 into the holding hole 6 and the dressing grindstone 7 into the holding hole 8 are provided. . These supply means 10 and 11 are specifically composed of manipulators provided between a diamond wheel 1 and a conveyor (not shown) that conveys a work material and a grindstone.

The work supply means 10 and the grindstone supply means 11 are controlled by a controller 12. Data is supplied to the control unit 12 from a sensor 13 that measures the rotation state of the diamond wheel 1,
Based on this data, the work supply unit 10, the grindstone supply unit 11, or the drive unit 14 is controlled.

The sensor 13 detects information necessary for determining whether or not dressing is necessary, and the following data can be considered as data used for determining whether or not this is necessary. B Diamond wheel drive current (load increases due to clogging) b Vibration generated in diamond wheel (vibration increases due to clogging) High, b differential value or integrated value (by performing such processing, spot It is possible to prevent erroneous judgments due to increased load)

Next, the operation of the above apparatus will be described with reference to the flowchart of FIG. Step 1 Based on the data supplied from the sensor 13, it is judged whether or not dressing is necessary, and if dressing is not necessary, proceed to the next step 2, and if dressing is necessary, step 6
Go to. Step 2 The work 5 is supplied to the holding hole 6 of the carrier plate 4. Step 3 The diamond wheel 1 is driven to grind the work 5. Further, along with this processing, data necessary for judging the necessity of dressing is collected. Step 4 The above step 3 is executed until the predetermined amount of processing is completed. Step 5 When the processing is completed, the diamond wheel 1 is stopped, the work 5 is taken out, and the process returns to Step 1.

When it is judged in step 1 that dressing is necessary, the dressing grindstone 7 is supplied to the holding hole 8 of the carrier plate 4 in step 6. Step 7 The diamond wheel 1 is driven to perform dressing. Step 8 The above step 7 is executed until the predetermined dressing is completed. Whether or not the dressing is finished is determined by, for example, whether or not a predetermined time has elapsed from the start of the dressing. Step 9 When dressing is completed, the diamond wheel 1 is stopped, the dressing grindstone 7 is taken out,
Return to step 1.

By the above operation, a dressing grindstone replacing the work is supplied to the carry plate as necessary,
The ground surface of the diamond wheel 1 can be maintained in a good state.

Since the holding hole 8 of the dressing grindstone 7 formed on the carrier plate 4 corresponds to the planar shape of the dressing grindstone 7, a different shape is selected according to the dressing grindstone 7 to be used. Plural kinds may be provided in advance. If a dressing grindstone having the same planar shape as the work 5 can be prepared, the holes for holding the work and for holding the dressing grindstone may be common.

[0022]

As is apparent from the above description, according to the present invention, by selectively feeding the workpiece or the dressing grindstone to the carrier plate, the grinding grindstone is dressed as necessary to prevent clogging. It is possible to prevent this and to grind the throw-away tip efficiently. Further, since either the work or the dressing wheel supply means operates based on the measurement data relating to the operating state of the grinding wheel, it is possible to accurately determine whether dressing is necessary. Further, since the carrier plate is provided with holes for holding the dressing grindstone, it is possible to obtain an effect that it is not necessary to use a dressing grindstone having a special shape.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of an embodiment of the present invention during grinding.

FIG. 2 is a perspective view of a main part of one embodiment of the present invention during dressing.

FIG. 3 is a perspective view of a carrier plate used in the apparatus of FIGS. 1 and 2.

FIG. 4 is a block diagram of a control system of the apparatus of FIGS. 1 and 2.

5 is a flowchart showing the operation of the control system of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 diamond wheel 4 carrier plate 5 work 6 holding hole 7 dressing grindstone 8 holding hole 10 work supply means 11 grindstone supply means
12 control unit 13 sensor

Claims (5)

[Claims] 1. A method for grinding a throw-away tip in which a pair of upper and lower grinding wheels are rotated to grind a work piece held by a carrier plate provided therebetween, wherein the work piece is cut on the carrier plate. The method for grinding a throw-away tip, characterized in that the step of rotating the grinding wheel in the state of holding the table and the step of rotating the grinding wheel in the state of holding the dressing wheel in the carrier plate are selectively performed. . 2. A pair of upper and lower grinding wheels, a carrier plate which is provided between the grinding wheels and holds a work material in a hole having the same plane shape as that of the grinding plate, and the work material is supplied to the carrier plate. In a throw-away tip grinding apparatus provided with a first supply means, the carrier plate includes:
A grinding tool for throw-away tips, characterized in that a holding hole having the same plane shape as that of the dressing wheel for dressing the grinding wheel is provided. 3. A second supply means for supplying a dressing grindstone to the holding hole, and a supply of a work material or a dressing grindstone to the carrier plate by controlling the first and second supplying means. The grinding device for a throw-away tip according to claim 2, further comprising: 4. The control means selectively operates the first or second supply means based on a measurement result of a driving state of the grinding wheel.
Throw-away tip grinding machine. 5. The throw according to claim 2, wherein the holding hole for the dressing grindstone in the carrier plate has a planar shape different from that of the hole formed for holding the work material. Away tip grinding device.