JPS6268268A - Work shaft drive device for gyro polishing machine - Google Patents

Abstract

PURPOSE:To improve polishing efficiency by applying the constitution wherein a work shaft fitted in a liftable polishing shaft chest is made to turn in either direction on a rack and pinion and the rotary direction of a workpiece is changed in a short time for the easy control of a polishing direction on the move of said chest. CONSTITUTION:When a workpiece has been held, upper and lower rotary discs 8 and 9 come down, a workpiece 31 is inserted in abrasives and a polishing shaft drive motor 14 is operated, thereby actuating a drive shaft and a crank arm, and causing the reciprocating turn of a rack. Concurrently, therefore, a pinion gives a reciprocating motion, while a polishing shaft 23 and the workpiece 31 giving a reciprocating turn. When the workpiece 31 is flat and made to agree to the dead point of the crank arm in a direction orthogonal with the flow direction of abrasives, the sliding speed of the rack becomes minimum at the aforesaid position in the motion of a crank mechanism. Namely, the rotary speed of the workpiece is minimum and time is prolonged when abrasives are orthogonally in contact with the workpiece, thereby improving polishing effect.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is a gyro system that charges loose abrasive material into a rotating tank, places a workpiece in the abrasive material, and finishes the surface and edges of the workpiece. The present invention relates to the structure of a shaft for gripping a workpiece of a polishing machine, and relates to the field of manufacturing, sales, and use of gyro polishing machines.

(Prior art) The axis of a conventional gyro polishing machine rotates on its own axis using a motor and a transmission i1.
! Since it was rotated using an IJ mechanism, it rotated at a constant speed in one direction.

(Problems to be Solved by the Invention) The rotating shaft of the conventional gyro polishing system rotates at a constant speed in one direction, so it is not possible to change the rotational speed during one rotation of the polishing shaft. Furthermore, since the direction of rotation of the motor had to be changed in order to reverse the polishing shaft, it was not possible to perform the reversal in an extremely short cycle. In addition, when attaching a workpiece to the polishing shaft, it is necessary to attach a stop position regulating device for the polishing shaft, and to match the positional relationship between the workpiece tightening mechanism of the polishing shaft and the workpiece loading device. Is that a problem?

(Means for Solving the Problems) In order to solve the above-mentioned 14 problems, this invention fixes a gear to the polishing shaft of a gyro polishing machine, configures the gear to be rotated by a rack, and reciprocates the rack. Since this is done by a crank mechanism or a fluid pressure cylinder, the polishing shaft rotates in the opposite direction every rotation, so there is no formation of a so-called tin layer that causes differences in polishing depth depending on the machined surface, and it is possible to remove surfaces that require polishing. However, it is possible to place the position facing the flow direction of the abrasive material at a position where the rotational speed of the shaft is slowest.In other words, by taking advantage of the unevenness of the rotational speed of the polishing shaft, it is possible to perform polishing at the back of one rotation. Since the workpiece can be held in the desired position for the longest time, polishing efficiency can be improved. In addition, when using the same reciprocating mechanism as a position adjustment device, if the polishing shaft stop position is used as the starting point and end point of the reciprocating mechanism, the rotation of the polishing shaft will be slow, and the stop error of the reciprocating mechanism will be minimized. Since there is almost no error in the stopping position of the polishing shaft, there is an advantage that positioning can be easily performed.

(Function of the Invention) According to the present invention, a workpiece shaft is supported in a grinding shaft housing that can be lowered, and the workpiece shaft is rotated in forward and reverse directions by a rack installed in the polishing shaft housing and a pinion fixed to the shaft. Since the workpiece is rotated, the direction of rotation of the workpiece can be changed within a very short time, and the polishing position of the workpiece can be easily regulated by moving the grinding shaft housing.

(Example) FIGS. 1 and 2 show schematic diagrams of a gyro polishing machine using the apparatus of the present invention. FIG. 1 shows only one unit of the invention for ease of understanding the drawing.

Four side columns 2a, 2b, 2c, and 2d are usually provided on a base 1, and a ceiling frame 3 is fixed above them.

A bearing is provided on the ceiling frame 3 so that the center shaft 37 of the diagonal 11 can be rotated. Further, a polishing machine 4 is installed on the base 1, the shaft 35 of which is supported on the base 1, and the polishing tank is rotated by a polishing tank rotating motor 5 and a speed reducer 6. The center shaft 37 can be driven intermittently by the generator device 7, and an upper rotary disk 8 and a lower rotary disk 9 are disposed on the center shaft 37, facing each other vertically with a predetermined distance therebetween. , the upper rotating disk 8
A plurality of guides 36a, 3 are provided between the
6b, 36C136d (Figure 2 shows the case of 12 pieces)
, and fixes the lower rotating disk 9. A plurality of workpiece shaft lifting cylinders 10 (FIG. 2 shows a case of 6 cylinders) are fixed to the upper rotating disk 8, and the tip 11 of the piston rod is connected to a polishing shaft housing 13a, 13b, respectively. Second
In the figure, six cases are shown) are fixed. Polished shaft housing 1
A grinding shaft is attached to each of 3a and 13b, and this grinding shaft is the subject of this invention. Details of this polishing shaft are shown in FIGS. 3, 4, and 5.

The polishing shaft housings 13a, 13b... are fixed to the tip 11 of the piston rod, and have two guides 36a,
It moves up and down inside 36b. Each polishing shaft tlE13a,
A polishing shaft drive motor 14 is attached to 13b, and a drive wheel 15 is fixed to the shaft end thereof. Drive wheel 1
A bin 16 is fixed on the circumference of the bin 16, and a crank arm 17 is rotatably attached to the bin 16.

A bottle 18 is attached to the other end of the crank arm 17,
A rack rod 19 with a rack cut out is attached to the top surface of the bin 18, and a hole at one end of the rack rod 19 has a hole in it.
The bin 18 is rotatably fitted, and the rack rod 19 is adapted to slide within a rack slide 20 fixed to the polishing shaft housing 13a. Rack rod 19
Pinion 21 is engaged with the rack of
1 is fixed to a polishing shaft 22. As shown in FIG. 5, the polishing shaft 22 is rotatable in a bearing 23 fixed to the polishing shaft fm13a, and is hollow, with a workpiece holding device shaft 24 passing through it. . The lower end of the workpiece holding device shaft 24 has a bin 25 fixed thereto as shown in FIG. An oval hole at one end of a workpiece fixing arm 26, 27 configured in the shape of a bell run passes through the bin 25.
As the workpiece holding device shaft 24 moves up and down, the workpiece fixing arms 26 and 27 rotate about the respective bins 28 and 29 as rotational axes, thereby attaching and detaching the workpiece.

A cylinder 38 (shown in FIG. 1) and a push rod 39 are installed above the workpiece holding device shaft 24 and separated from the holding device shaft 24, and when the push rod 39 is lowered, a spring 30 is released.
is compressed to lower the workpiece holding device shaft 24 and release the held workpiece. Conversely, when the Vinton is raised, the workpiece holding device shaft 24 is raised by the tension force of the spring 30, and the workpiece is removed. hold.

The operation of the device of the present invention will be explained based on the mechanism as described above.

The polishing tank is rotated by charging the granular abrasive material, water and compound if necessary into the polishing tank 4, and rotating the polishing tank rotation sweater 6. The workpiece 31 is gripped by workpiece fixing arms 26,27 and polished by inserting it into an abrasive material.

The present invention relates to a device for rotating the workpiece in a polishing tank, which holds the workpiece, and a positioning device for attaching and removing the workpiece, and the same device can be used for both purposes. Further, the process from mounting the workpiece to removing the workpiece after polishing can be performed automatically by a sequence control device, but some parts may also be done manually.

When the polishing end time has elapsed and the polishing shaft 23 stops at the workpiece supply position, it is lowered by the hydraulic cylinder 38 above the workpiece holding shaft 24 . therefore,
The bin 25 shown in FIG. 6 is lowered, and the workpiece fixing arm 26.
Open 27. Therefore, the workpiece 31 is released from the fixed arm and taken out of the system by the cutting device.

On the other hand, the four unprocessed crops taken out from the cutting unprocessed workpiece conveyor are transferred to the workpiece fixing arm 26 of the processed workpiece.
．． 27, the piston of the hydraulic cylinder 38 above the bin 25 is withdrawn and the workpiece holding shaft 24 is raised under the action of the spring 30 to grip a crop.

When gripping is completed, the upper rotary plate 8 and the lower rotary plate 9 are lowered, and the workpiece 31 is inserted into the abrasive material.

When the workpiece 31 is gripped, the polishing shaft drive motor 14 is driven to drive the drive wheel 15 and crank arm 17, and the rack 19 reciprocates. Therefore pinion 21
The polishing shaft 23 fixed thereto also performs reciprocating rotation, and therefore the workpiece 31 also performs reciprocating rotation.

At this time, for example, if the workpiece has a flat shape as shown in Figure 6, when the direction shown in the figure is perpendicular to the flow direction of the abrasive material, the dead center of the crank arm (as shown in Figure 4) If the position of the crank arm is set to match the position shown in the figure, the sliding speed of the rack is the slowest at this position in the movement of the crank mechanism, and therefore the rotational speed of the workpiece is the slowest. On the other hand, the time during which the abrasive material hits at right angles becomes longer, and the polishing effect can be improved.

When the predetermined polishing time ends and the polishing shaft 23 stops at the workpiece supply position as described above, the stop position is regulated by moving the dog 34 attached to the drive wheel 15 to the polishing shaft as shown in FIG. This is done by detection by the proximity switch 33 attached to the housing 13a. In this case as well, as shown in the same figure, if the stop position is the dead center position of the crank, the stop command is issued at the slowest position of the driving wheels, so not only is the stopping speed good, but the stop position is also the same. Even if there is a minute error, the positions of the workpiece fixing arms 26 and 27 hardly change, and from this point of view as well, the stopping accuracy is improved.

In the above embodiment, the reciprocating movement of the rack is performed by a crank mechanism, but the present invention is not limited to this, and reciprocating movement by a fluid pressure cylinder may also be used. In short, as long as the rack is on the R side that allows reciprocating movement, it falls within the scope of this invention.

(Effects of the Invention) As described above, according to the present invention, by attaching this device to the polishing shaft of a gyro polishing device, the direction in which the workpiece can be polished most efficiently is set as the starting point of rack movement. By setting it at the end position, the holding time in the direction with good polishing efficiency can be shortened, and the polishing efficiency can be improved. At the same time, the workpiece to be machined can be removed and the four unfinished products can be attached. This has great effects, such as improving positioning accuracy by using the workpiece loading and unloading positions as the start and end points of rack movement.

[Brief explanation of drawings]

FIG. 1 is an overall side view of a gyro polishing machine equipped with a device according to the present invention, FIG. 2 is a plan view, FIG. 3 is a front view of the device according to the present invention, FIG. 4 is a plan view, and FIG. 6 is a front view showing the workpiece gripping device, and FIG. 7 is a partially sectional view. 1... Base 3... Ceiling frame 4... Polishing tank 8... Upper rotating disk 9... Lower rotating disk 10... Cylinders for lifting and lowering workpieces 13a, 13b-Ul polishing shaft Housing 14... Polishing shaft drive motor 15... Drive wheel 17... Crank arm 19
... Rack rod 20 ... Rack slide 21
... Pinion 22 ... Polishing shaft 24 ... Workpiece holding device shaft 26.27 ... Workpiece fixing arm

Claims (1)

[Claims] 1. In a gyro polishing machine in which loose abrasive material is charged into a rotating tank and a workpiece is inserted into the abrasive material to finish the surface and edges of the workpiece, the workpiece axis is aligned. A polishing shaft casing mounted on the machine body so as to be movable up and down, a pinion fixed to the workpiece shaft, a rack meshing with the pinion, and a reciprocating mechanism for reciprocating the rack. A drive device 2 for a workpiece shaft for a gyro polishing machine, characterized in that the reciprocating mechanism includes a drive wheel rotated by a motor installed in a polishing shaft housing, and one end located at an eccentric position of the drive wheel. and a crank arm whose other end is rotatably attached to a rack. A drive device for a workpiece shaft for a gyro polishing machine according to claim 1, wherein the drive mechanism is a fluid pressure cylinder interposed between the rack and the polishing shaft housing.