JPS63109965A - Grinding method - Google Patents

Abstract

PURPOSE:To grind and outer peripheral face with high efficiency without causing falling by interposingly holding plural flat and ring type workpieces with holding members, conveying said workpieces to an infeed type coreless grinder, and forming a gap between one of said holding members and said workpieces. CONSTITUTION:When workpieces 26 are conveyed to the position of a loader body 5, the rod 7a of a cylinder 7 is lowered lowering a wedge 9, a link 11 is rotated counterclockwise, and a rod 18 is moved in the arrow X1 direction, to clamp the workpieces 26 with a movable claw 21a and a fixed claw 21b. Then, by moving the loader body 5 in the X1 direction to convey the workpieces 26 in between grinding wheels, the piston 8a of a cylinder 8 is lowered feeding oil in the cylinder 8 into the cylinder 7, the wedge 9 is lifted up via the piston 7a, to form a gap in between the movable claw 2a and the workpieces 26. The value of the gap is formed to such a degree that the workpieces are not fallen, and grinding is carried out by advancing the grinding wheels.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of grinding the outer periphery of a flat ring-shaped work using an infeed type centerless grinder.

[Conventional technology]

Conventionally, flat ring-shaped workpieces (hereinafter simply referred to as workpieces) have been processed by cylindrical grinding, in which a shaft is passed through the inner diameter of the workpiece and the workpiece is fixed to the shaft by mechanical means such as bolt tightening, in order to prevent the workpiece from falling during grinding. This was done using a grinder, through-feed type, or in-feed type centerless grinding machine. When grinding the outer circumference of the workpiece mentioned above, if the workpiece is tilted, the machining accuracy (squareness) will decrease and the resulting product will be unusable. Must be prevented.

[Problem that the invention seeks to solve]

However, in the conventional grinding method, it is necessary to pass a shaft through the inner diameter of the workpiece in order to prevent the workpiece from collapsing, so there is a problem in that the number of processing steps becomes large.

Therefore, an object of the present invention is to provide a method that can grind the outer peripheral surface of a flat ring-shaped workpiece with high efficiency without causing the workpiece to fall.

[Means for solving problems]

In order to solve the above problems, the present invention clamps a plurality of flat ring-shaped workpieces between a pair of holding members, transports them to an infeed type centerless grinding machine, and then connects one of the holding members with the workpieces. This technique employs a technical method of forming a minute gap between the two and then grinding the outer periphery of the workpiece.

〔Example〕

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic perspective view showing an example of an apparatus for implementing the present invention.

In the figure, reference numeral 1 denotes an infeed type centerless grinding machine, which has a grinding wheel 2 and an adjustment wheel 3.

4 is a loading device for supplying the workpiece 26 to the grinding machine. Reference numeral 5 denotes a loader main body, which can be moved in the direction of the arrow shown in the figure along rails 23, 23 by means of a transport cylinder 22 connected thereto. 24 is a belt conveyor for conveying the workpiece 26 held in the magazine 25 in the direction of the arrow in the figure.

Next, details of the loading device 4 will be explained with reference to FIG.

A clamping hydraulic cylinder 7 and an unclamping hydraulic cylinder 8 connected thereto are attached to the upper part of the frame 6 of the loader main body 5.

8a is a piston, and 8b is a med for setting an oil amount.

A wedge 9 fixed to the piston 7a is provided at the lower part of the clamping cylinder 7. 10. Reference numeral 10 denotes a guide roller installed on the loader body 5 to guide the wedge 9. Guide frame 6 connected to frame 6
A link 11 having a fulcrum 12t is slidably installed at '.

A roller 13 that contacts the wedge 9 is pivotally supported at the upper part of the link 11. The roller 13 is also in contact with a bolt member 14 fixed to the frame 6.

An arm 15 is fixed to the side of the link 11, and the arm 1
The lower part of 5 engages with screw 16. The screw 16 is fixed to a support member 17 provided at the bottom of the ring 11. A fixing rod 18 is fixed to the support member 17. A movable piece 20 is attached to the fixing rod 18, and the movable piece 20 is attached to a support piece 19 fixed to the lower surface of the side frame 6'. 21a is the fixing rod 18
21b is a fixed claw fixed to the lower end of the frame 6. 26 is a workpiece.

The procedure for grinding using the above device is as follows.

First, the belt conveyor 24 is operated to transport the workpiece 26 to the loader main body 5 position. When the rod 7a of the clamping cylinder 7 is lowered, the wedge 9 is lowered as shown by the arrow, and the link 11 moves counterclockwise about the fulcrum 12. As a result, the fixing rod 18 moves in the direction of arrow X1, and the movable claw 21a moves onto the workpiece 2.
6 side, and the workpiece 26 is clamped by the movable claw 21a and the fixed claw 21b.

Next, the transport cylinder 22 shown in FIG. 1 is operated to move the loader main body 5 in the
and the adjustment grindstone 3.

After that, the piston 8a of the unclamping hydraulic cylinder 8
is lowered to supply the oil in the cylinder 8 into the clamping hydraulic cylinder 7. This causes the piston 7a to rise and the wedge 9 to rise accordingly. Therefore, the movable claw 21a moves the workpiece 2 by the principle opposite to that of the clamp described above.
A gap is formed between the movable claw 21a and the workpiece 26 apart from the movable claw 21a. The value of this gap may be set to such an extent that the workpiece 26 does not substantially fall over, and is generally in the range of 0.2 to 0.3 mm, although it varies depending on the dimensions of the workpiece. Here, the gap dimension, that is, the amount of retraction of the movable claw, is
It can be adjusted by the amount of oil supplied from the cylinder 8 to the cylinder 7. The amount of oil is adjusted by providing an oil amount setting rod 8b on the piston 8a and changing the distance between the rod 8b and the top surface of the cylinder 8.

When the workpiece is in the above-mentioned unclamped state, the adjusting grindstone 3 is advanced to grind the outer peripheral surface of the workpiece. After finishing the grinding, move the adjustment grindstone 3 back to its original position.
The transport cylinder 22 is operated to move the loader body 5 to the position shown in FIG. After that, move the movable claw 21a in the X2 direction shown in the figure to release the clamp on the workpiece 26,
The workpiece 26 is returned into the magazine 25. and conveyor 2
4 to transport the ground workpiece 26 to a predetermined position and transport the next workpiece 26 to the loader main body 5.

By repeating such steps, continuous automatic processing of the workpiece can be performed.

Next, using the apparatus shown in FIGS. 1 and 2, the outer diameter 49
w1 Inner diameter 21 Tsuru, thickness 4.8 Dragon ferrite magnet 39
The outer periphery was ground by centrifuging each magazine. In this case, the gap between the workpiece and the movable jaw is set to 0.25 mm, a metal bond grindstone with an outer diameter of 4001 m is rotated at 200 Or, p, ta, and the depth of cut is approximately 1.0 mm. And so. As a result of measuring the squareness of the workpieces after grinding, as shown in Table 1, the squareness of all the workpieces was 0.0.
It was found that it was possible to maintain a dimensional accuracy of 2 m or less, which was equal to or higher than that of the conventional method. Moreover, in all experiments, the time from the start of clamping the workpiece to the end of unclamping was about 60 seconds, which was 173 seconds compared to the conventional method.

Table 1 [Effects of the Invention] As described above, according to the present invention, a small gap is provided between the flat ring-shaped workpiece and one of the pair of workpiece clamping claws to prevent the workpiece from falling over, and the infeed type Since the outer periphery is ground using a centerless grinder, it is possible to perform highly accurate and highly efficient machining.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an example of an apparatus for implementing the present invention, and FIG. 2 is an enlarged view of the main part of FIG. 1. 1: Centerless grinder, 4: Loading device, 5: Loader main body, 7: Hydraulic cylinder for clamping, 8: Hydraulic cylinder for unclamping, 21a: Movable claw, 21b: Fixed claw, 26: Workpiece.

Claims (1)

[Claims] A plurality of flat ring-shaped workpieces are held between a pair of holding members and transported to an infeed type centerless grinding machine, and then a minute gap is formed between one of the holding members and the workpiece. A grinding method characterized by grinding the outer periphery of the workpiece.