JPH06285752A - Nc throwaway tip surface grinding machine - Google Patents

Abstract

PURPOSE:To provide a surface grinding machine which is stable in machining precision even if long time continuous surface grinding operation is performed by various type throwaway tips. CONSTITUTION:A NC throwaway tip surface grinding machine 1 is provided with a pallet changer 15 to allow continuous supply and withdrawal of throwaway tips 14 and a supply and takeoff device including a robot 8. Also provided a carrier plate 4 for various types and a grinding wheel position detecting means to correct the secular changes of the end face positions of surface grinding wheels 2, 3 due to wear and thermal displacement are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface grinding machine for surface cutting of throw-away inserts made of cemented carbide, cermet or ceramics.

[0002]

2. Description of the Related Art A conventional NC throw-away tip surface grinding machine feeds a single type of throw-away tip for cutting with a conveyor belt, positions it with a jig corresponding to the shape of the throw-away tip, and The robot supplies it to the carrier plate with holes, and after the surface grinding process, it is sent on a vibrating net, and finally it is collected on a circular table.

[0003]

The conventional grinding machine of this kind as described above has the following problems.

First, it is necessary to replenish the throwaway chips before processing from the storage pallet onto the conveyor belt and to align the throwaway chips after processing from the recovery circular table onto the storage pallet, which requires manpower.

Next, since the number of stored throwaway chips before processing and the number of collectable throwaway chips after processing are small, continuous operation time is short. In addition, the shape of the jig for positioning before the throw-away tip is supplied to the carrier plate by the robot is different for each model number, so it must be replaced every time the workpiece is changed.

Further, since the shape of the hole for inserting the throw-away tip of the carrier plate can accommodate only one kind of the object to be machined, it must be replaced every time the object to be machined is changed.

Since the change in the thickness of the grindstone end face due to wear of the grindstone or thermal displacement causes a large change in the thickness, the position of the grindstone end face must be adjusted manually.

Due to the above reasons, it is extremely difficult for the conventional grinding machine to continuously perform unmanned operation.

In view of the problems of the conventional grinding machine as described above, the present invention provides an NC grinding machine capable of continuously and unmanned for a long period of time the surface grinding of multiple indexable inserts. With the goal.

[0010]

In order to solve the above problems, the present invention provides a storage pallet in which a large number of cutting away inserts made of a super hard material such as a super hard alloy, cermet or ceramic are arranged. From the robot, one throw-away tip is supplied to the grinder by the robot, and the throw-away tip, which has been surface-ground by this grinder, is taken out by the robot again, and the work of aligning the original pallet is repeated. An NC throwaway chip plane having a supply and recovery device equipped with a pallet changer that automatically replaces the entire storage pallet with the next one when all the processing of the throwaway chips on one pallet is completed. Provide a grinding machine.

Further, the NC throw-away tip surface grinder is provided with a carrier plate having a plurality of types of holes suitable for holding the throw-away tips of a plurality of types, and holes corresponding to the model number to be machined are provided. The robot automatically selects and then supplies the throw-away tip corresponding to this hole to the hole or the surface grinder of the throw-away tip automatically detects the coordinate position of the grinding wheel end surface. There is also provided a structure in which a grindstone position detecting means is provided for automatically correcting the coordinate position value of the grindstone end face by the amount of change in the grindstone end face position due to wear or thermal displacement of the grindstone.

[0012]

[Operation] From the storage pallet in which a large number of cutting inserts for cutting are aligned, one throwing insert is supplied to the grinding machine by the robot, and the grinding machine performs surface grinding. When the throw-away chips that have been processed are taken out again by the robot and aligned with the original pallet, the processing of the throw-away chips on one pallet is completed. Automatically exchange for one.

Further, the NC throw-away tip surface grinder is provided with a carrier plate having holes of a plurality of shapes suitable for holding the throw-away tips of a plurality of shapes, and holes corresponding to the model number to be machined are provided. The robot automatically selects and then supplies the throw-away tip corresponding to this hole to the hole.

Further, the coordinate position of the grindstone end face is automatically detected, and the coordinate position value of the grindstone end face is automatically corrected by the amount of change in the grindstone end face position due to wear or thermal displacement of the grindstone.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of an apparatus for carrying out the present invention. In FIG. 1, reference numeral 1 denotes a vertically grindable grinding wheel 2 and 3 arranged vertically by a grinding machine, and a carrier plate 4 corresponding to multiple model numbers. And a swivel base 5 that reciprocally swivels,
The plate 4 on the swivel base 5 is fixed and the upper and lower grindstones 2,
It has a conveying means 6 which can be moved back and forth between 3 and 3.

The carrier plate 4 has a plurality of holes adapted to the chips 14 of various shapes and is made into a carrier plate 4 corresponding to multiple model numbers.

On the table 7 provided on the side of the grinding machine 1,
A handling robot 8 is provided. The robot 8 is provided with a robot arm 10 capable of bending freely on a swivel base 9 that swivels around a vertical axis, and a tip suction hand 11 and an image camera 12 that can be raised and lowered at the tip of the arm 10 and are mounted on the base 7
An image stage 13 is provided on the upper side so that the shape of the throw-away tip 14 sucked by the suction hand 11 can be recognized.

A pallet changer 1 is provided in front of the table 7.
5 is provided. This pallet changer 15 is a case 16
A pair of left and right lifts 17 and 18 are provided inside, and a large number of storage pallets 20 are stacked on it. The storage pallet 20 is provided with compartments for storing the chips 14 in an aligned manner. Then, after the image camera 12 of the robot 8 automatically selects the hole corresponding to the machining model number of the carrier plate 4 on the swivel base 5, the pallet changer 1
Chip 14 in the uppermost storage pallet 20 in FIG. 5 that matches the shape of the hole automatically selected by the image camera 12
Is picked up by the chip suction hand 11 and placed on the image stage 13, and the chip 1 is picked up by the image camera 12.
The shape and the shape of the carrier plate 4 are recognized, and the angle and position when the carrier plate 4 is supplied to the hole are automatically determined.

The chip 14 whose shape has been recognized as described above
Is inserted into the hole of the carrier plate 4 on the swivel base 5 by the action of the robot arm 10. After inserting the chip into the hole of the carrier plate 4, the swivel base 5 makes a half turn and the chip 14
The carrier plate 4 fitted with is inserted between the upper and lower surface grinding wheels 2 and 3 which are rotating, and stopped or rocked.

Next, the upper surface grinding wheel 2 is rotated and lowered to a predetermined position to polish the upper surface of the chip 14 fitted in the hole of the carrier plate 4. Further, the lower surface grinding wheel 3 also rises to a certain height and rotates to polish the lower surface of the chip 14.

The carrier plate 4 which has been polished returns to its original position by a half rotation together with the swivel base 5, is taken out from the hole of the carrier plate 4 by the action of the robot arm 10 and the like, and is placed at the top of the pallet changer 15. Store in the original location of the storage pallet 20.

When the processing of all the chips 14 stored in the uppermost storage pallet 20 is completed by repeating the above work, this storage pallet 20 is automatically replaced with the next one.

Further, since the storage pallet 20 is placed on the lift table 17 or 18 which is moved up and down by an appropriate lifting means, as the storage pallet 20 is reduced, the lift table 17 or 18 is raised and the uppermost storage pallet is moved. Make sure that 20 always maintains a constant height.

Reference numeral 21 in FIG. 1 is a thickness measuring device provided on the table 7 to measure the thickness of the throw-away tip 14. Reference numeral 22 is a cleaning / drying device for the carrier plate 4, and 23 is an automatic dressing device provided in the grinder 1 for removing clogging of the polishing surfaces of the grindstones 2, 3. Reference numeral 24 denotes a sensor for detecting the height of the upper and lower grindstones 3, which is projected and retracted on the grinding surfaces of the grindstones 2 and 3 by advancing and retracting means 25 such as an air cylinder.

The sensor 24 is used as shown in FIGS. 2a, 2b and 2c. That is, when the positions of the grindstones 2 and 3 at the time of grinding are normal, the sensor 24 retracts to move the grindstones 2 and 3 as shown in FIG. 2a.
Away from. If it is expected that the position of the end surface of the grindstone 3 will change over time after being used for a certain period, the sensor 2
4 is advanced to detect the position of the grindstone 3.

When the position of the upper surface of the grindstone 3 is lower than the prescribed value, the grindstone 3 is raised to a predetermined position as shown in FIG. 2c. The upper grindstone 2 is adjusted in the same manner.

[0028]

As described above, according to the present invention, the NC throw-away tip surface grinding machine is provided with the pallet changer capable of continuously feeding and collecting the throw-away tips, and the feed and take-out device consisting of the robot. By installing a carrier plate corresponding to the above, it is not necessary to replenish or recover the workpieces during operation, which is required in the past, and it is necessary to carry out setup work such as jig replacement when machining multiple model numbers. Therefore, long-term continuous unmanned operation of multiple model numbers, which has been impossible in the past, becomes possible.

Since the grindstone position detecting means for correcting the temporal change of the grindstone end face position due to the abrasion and thermal displacement of the grindstone is provided, the influence of the temporal change on the thickness dimension is reduced, and therefore even if the continuous operation is carried out for a long time. Stable processing accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a side view showing the operation of the above-mentioned grindstone position detecting means.

[Explanation of symbols]

 1 Grinding machine 2, 3 Surface grinding wheel 4 Carrier plate compatible with multiple model numbers 6 Transfer means 8 Handling robot 12 Image camera 13 Image stage 14 NC throw-away tip 15 Pallet changer 20 Storage pallet

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Chiatsu Yukawa 1-1-1 Kunyokita, Itami City, Hyogo Prefecture Sumitomo Electric Industries Itami Works

Claims (3)

[Claims] 1. A robot feeds one throw-away tip to a grinder from a storage pallet in which a large number of throw-away tips for cutting are made of cemented carbide, cermet or ceramics. When the throw-away tip, which has been surface-ground by this grinder, is taken out by the robot again and aligned to the original pallet, the throw-away tip on one pallet is completely processed. ,
An NC throw-away tip surface grinder having a supply / recovery device equipped with a pallet changer for automatically replacing the entire storage pallet with the following one. 2. An NC throw-away tip surface grinder for performing surface grinding by inserting a cutting away insert made of cemented carbide, cermet or ceramics, etc. between upper and lower grindstones of a grinder. Provide a carrier plate with holes of multiple types suitable for holding multiple types of throw-away tips, and after the robot automatically selects the holes corresponding to the model number to be processed,
The throw-away tip surface grinder according to claim 1, wherein a throw-away tip corresponding to the hole is supplied to the hole. 3. A surface grinding machine of a throw-away insert for cutting made of a cemented carbide, cermet, or ceramic material such as cemented carbide, automatically detects the coordinate position of the end face of the grindstone, and detects the abrasion or thermal displacement of the grindstone. 2. The NC throw-away tip surface grinding machine according to claim 1, further comprising a grindstone position detecting means for automatically correcting the coordinate position value of the grindstone end surface by the amount of change in the grindstone end surface position.