JPS61270071A - Sphere lapping machine - Google Patents

Abstract

PURPOSE:To lap a sphere in an efficient manner, by inserting a lap ball screw rotatably into a lap cylinder, while installing a conveying mechanism which feed the sphere being fed through a thread groove of this lap ball screw and discharged out of the lap cylinder to the inside of this lap cylinder again. CONSTITUTION:When a lapping compound L and a sphere 2 are supplied out of a hopper 4 of a first lap cylinder, this sphere 2 is conveyed as being rubbed in friction, to an internal thread groove 6 of the first lap cylinder 1 and an external thread groove 7 of a first lap ball screw 8 via the lap compound L, and then discharged from an exhaust pipe body 5 of this first lap cylinder 1 to a hopper 15 of a second lap cylinder 13. Herefrom, it is delivered to the inside of the second lap cylinder 13, and rubbed in friction with an internal thread groove 16 of this cylinder body 13 and an external thread groove 17 of a second lap ball screw 18 via the lapping compound L and, after being lapped, the sphere 12 being discharged to a receiving body 23 rolls on a lower guide body 40, and is projected into the hopper 4 of the first lap cylinder 1 by operation of a conveyor 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a sphere processing device for processing a sphere with high precision.

[Technical background of the invention and its problems 3 Lapping is known as a means of finishing a sphere. In this lapping process, highly accurate sphericity is required as the processing accuracy of the sphere.

Conventionally, devices having the following structure are known as devices for lapping a sphere. That is, an upper wrap plate and a lower wrap plate are provided to face each other in the vertical direction, and a holding groove having a V-shaped cross section for holding the sphere is cut in the lower wrap plate in the central direction.

The sphere held in the holding groove is held under a predetermined pressure by the upper and lower lap plates, and in this state the upper lap plate is driven to rotate to lap the sphere.

However, in the method of lapping a sphere using such an apparatus, the apparatus must be stopped and the sphere must be taken in and out of the holding groove each time one cycle of lapping is completed. In other words, since it is a batch method, processing efficiency is extremely poor.

[Purpose of the invention]

This invention enables spherical lapping to be performed continuously, efficiently, and with high precision.
The aim is to provide a

(Summary of the Invention) The present invention relates to a lap cylinder body having an input port formed at one end in the axial direction and a discharge port formed at the other end, a lap ball screw rotatably inserted into the lap cylinder body, and the lap ball screw. a drive source that rotates and drives the sphere input from the input port to send it through the thread groove of the lap ball screw and discharge it from the discharge port; This sphere processing apparatus is equipped with a conveyance mechanism for supplying the sphere to the spherical body, thereby making it possible to perform the lapping process of the sphere efficiently and with high precision.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

The sphere processing apparatus shown in the drawings includes a first wrapped cylinder 1 arranged with its axis inclined at a predetermined angle. An input port 2 is formed at one axial end of the first wrap cylinder 1, and a discharge port 3 is formed at the other end. A hopper 4 is connected to the input port 2, and a discharge pipe 5 is connected to the discharge port 3. A female thread groove 6 having a semicircular cross section is formed on the inner circumferential surface of the first wrap cylinder 1 . Further, a first lap ball screw 8 is rotatably inserted into the first lap cylinder body 1 and has a male thread 1lII7 formed on its outer peripheral surface with a shape and pitch corresponding to the female thread groove 6. . The lap cylinder 1 and the lap ball screw 8 are made of a material suitable for lapping, such as cast iron or copper, and the distance between the female thread groove 6 and the male thread groove 7 is set from the input port 2 to the discharge port 3. It gradually becomes smaller in the direction of . In other words, the inner diameter of the wrap cylinder 1 is gradually reduced toward the discharge port 3.

One end of the first lap por screw 8 protrudes from one end surface located above the first lap cylinder 1, and a rotating shaft 10 of a motor 9 is connected thereto. This motor 9
An ultrasonic vibration generator 11 is integrally connected to the motor 9, that is, the first lap ball screw 8 is vibrated. A large number of spheres 12 as workpieces are fed from the hopper 4, and these spheres 12
is discharged from the discharge pipe body while its outer peripheral surface is rubbed by the female groove 6 and male thread groove 7 by the first lap ball screw 8.

Sphere 1 discharged from discharge tube 5 of first wrap cylinder 1
2 falls into a hopper 15 connected to an input port 14 at one axial end of the second cylindrical body 13. This second
The wrap cylinder 13 is arranged to be inclined in the opposite direction to the first wrap cylinder 1, and has a female thread 16 having a semicircular cross section on the inner peripheral surface.
is formed. Further, a second lap ball screw 1B having a male thread 17 corresponding to the female thread 16 formed on the outer peripheral surface thereof is rotatably inserted and held in the second lap cylinder 13. One end of the second lap ball screw 18 protrudes from one end surface located on the upper end side of the second lap cylinder 13, and a rotating ring 20 of a motor 19 is connected thereto. This motor 19 is integrally provided with an ultrasonic generator 21 to vibrate this motor 19, that is, the second lap ball screw 18. Further, the interval between the female thread 16 and the male thread 17 is set to gradually become smaller from the upper end side of the second wrap cylinder 13 to the lower end side. In other words, the inner diameter of the second wrap cylinder 13 is formed to become gradually smaller from the upper end to the lower end.

Then, the sphere 12 supplied from the hopper 16 into the second wrapped cylinder 13 is conveyed by the second lap ball screw 18 while being rubbed by the female thread 16 and the male thread 17, and is transported to the second lap cylinder 13. The box-shaped receiver is discharged into a body 23 from a discharge pipe body 22 connected to a discharge port 21a at the lower end of the body. The second lap cylinder 13 and the second lap ball screw 18 are made of a material suitable for lapping, similar to the first lap cylinder 1 and the lap ball screw 8 described above.

A first tank 25 equipped with a first pump 24 is disposed above the hopper 4 of the first wrap cylinder 1, and the wrap agent is supplied from the tank 25 to the hopper 4. It has become. The wrap agent supplied from the first tank 25 is discharged into the body 23 from the first wrap cylinder 1 through the second wrap cylinder 13 in the same way as the sphere 12 .

This receiver body 23 is provided with a second pump 26, and the second pump 26 returns the wrap agent from the receiver body 23 to the first tank 25 through a pipe 27. In addition, a branch pipe 2 is provided in the middle of this pipe 27.
One end of 8 is connected. The other end of this branch pipe 28 is connected to a second tank 29 disposed opposite to the hopper 15 of the second wrap cylinder 13 . Therefore, from this second tank 29 to the second wrap cylinder 13
It is also possible to supply the wrap agent directly into the container.

On the other hand, the spheres 12 discharged from the second wrap cylinder 13 into the receiving body 23 can be supplied again to the hopper 4 connected to the input port 2 of the first wrap cylinder 1 by the conveyance mechanism 31. It looks like this. In other words, the transport mechanism 3
1 is equipped with a conveyor 32. This conveyor 32 has a chain 35 stretched between an upper pulley 33 and a lower pulley 34, and this chain 35 is covered with a duct 36. The upper pulley 33 is rotationally driven by a motor 33a. Furthermore, box-shaped receivers 37 are attached to the chain 35 at regular intervals. Further, an inlet 38 is formed at the lower end of the duct 36, and an outlet 39 is formed at the upper end. The ball 12 discharged into the body 23 is then placed in the lower guide body 40.
is transferred and introduced into the duct 36 from the introduction port 38, and the receiver rides on the tool 37. The sphere 12 riding on the receiver 37 is discharged by centrifugal force from the outlet 39 to the upper guide body 41, and is rolled into the hopper 4 connected to the input port 2 of the first wrap cylinder 1. It is now being supplied.

According to the sphere machining device having such a structure, the first and second lap ball screws 8.18 are rotated and vibrated, and the chain 35 of the conveyor 32 is run endlessly in the direction of the arrow, and then the lap agent is removed. and sphere 2 as the first
If it is supplied from the hopper 4 of the wrapped cylinder 1, this sphere 1
2 is conveyed while being rubbed by the female thread groove 6 of the first wrapped cylinder 1 and the external thread groove 7 of the first lap ball screw 8 through the wrap agent, and the Discharge pipe body 5
from there to the hopper] 5 of the second wrap cylinder 13.

From there, it is fed into the second wrapped cylinder 13, and after being rubbed by the female thread 11116 and the male thread groove 17 of the second wrapped ball screw 18 through a wrapping agent, it is lapped. The receiver is discharged from the discharge pipe body 22 of the second lap cylinder body 13 to the body 23.

In addition, after the wrap agent is discharged into the body 23, the second
is returned to the first tank 25 by the pump 26 . In addition, the ball 12 discharged into the receiving body 23 is transferred to the lower guide body 4.
The receiver attached to the chain 35 of the conveyor 32 is conveyed on the tool 37 through the introduction 038 of the duct 36.

Then, the sphere 12 is discharged from the outlet 39 of the duct 36 to the upper guide body 41, transferred, and thrown into the hopper 4 of the first lap cylinder 1 again.

Therefore, according to the sphere processing apparatus having the above structure, the sphere 1
Since the spherical bodies 12 can be lapped continuously by charging them from the hopper of the first lapping cylinder 1, the lapping of the spheres 12 can be performed more efficiently than in the conventional batch method.

Furthermore, since the wrap distance of the sphere 12 is determined by the distance between the female thread groove 6.16 and the male thread groove 7.17 of each wrap cylinder 1.13 and the lap ball screw 8.18, the above-mentioned sphere 12 is It can be processed to the desired diameter with high precision. Further, the lapped sphere 12 passing through the first and second lapped cylinders 1.13 is again supplied to the hopper 4 of the lapped cylinder 1 of the box 1 by the transport mechanism 31. Therefore, since the sphere 12 is lapped repeatedly, this also improves the machining accuracy.

Furthermore, since the distance between the female thread groove 6.16 and the male thread groove 7.17 is set to become smaller as the flow of the sphere 12 progresses downstream, the sphere 12 is gradually lapped to the desired dimensions with precision. can do. Furthermore, since each lap ball screw 8.18 is subjected to ultrasonic vibration, the sphere 12 can be lapped with high precision and a good surface.

In addition, in the above embodiment, the sphere is lapped in two stages using the first and second lap cylinders and the lap ball screw, but it may be done in one stage or three or more stages instead of two stages. Good too.

〔Effect of the invention〕

As described above, in the present invention, a wrap ball screw is rotatably inserted into a wrap cylinder, a sphere is introduced through an input port formed at one end of the wrap body, and the sphere is inserted into the thread groove of the wrap ball screw. The spheres are sent by a conveyance mechanism to be discharged from a discharge port formed at the other end of the wrap cylinder, and the spheres discharged from the discharge port are again supplied to the input port by a conveyance mechanism. Therefore, since lapping of the spheres can be performed continuously, processing efficiency can be improved compared to the conventional batch method.

In addition, the outer dimensions of the sphere can be finished with high precision according to the distance between the inner circumferential surface of the lapped cylinder and the outer circumferential surface of the lapped ball screw, and the lapping can be repeated repeatedly by conveying the sphere by the conveying mechanism. This can also improve machining accuracy.

[Brief explanation of drawings]

The drawing is a schematic diagram of the entire apparatus showing an embodiment of the present invention. 1.13... Wrap cylinder, 2.14... Inlet, 3
．． 21...Discharge port, 6.16...Female thread groove, 7.1
7...Male thread groove, 9.19...Motor (drive m>,
8.18...Lap ball screw, 12...Sphere, 3
1... Conveyance mechanism, 32... Conveyor.

Claims (1)

[Claims] A lap cylinder has an input port at one end in the axial direction and a discharge port at the other end, a lap ball screw rotatably inserted into the wrap cylinder, and the lap ball screw is rotationally driven to input the material from the input port. a drive source that sends the rolled spheres through the thread groove of the lap ball screw and discharges them from the discharge port; and a conveyance mechanism that supplies the spheres discharged from the discharge port back into the lap cylinder from the input port. A sphere processing device characterized by: