KR101012721B1 - Jig and Jig Holder for Wrapping Ball Screw Shafts - Google Patents

Abstract

The present invention relates to a jig and a jig holder for lapping processing of a spiral groove of a ball screw shaft used in a ball screw device, and more particularly, to a ball screw shaft. The helical groove of the ball screw shaft is smooth and precise by grinding and grinding the helical groove to be formed using a semi-cylindrical jig having a lapping protrusion and a jig holder capable of supporting and pressing the jig. Ball screw shaft lapping jig and jig holder that can provide ball screw shafts with high durability and wear resistance by lapping ball screw shafts with various radii and strengths using a single jig and jig holder. It is about.

Description

Jig and jigholder for ball screw}

The present invention relates to a jig and a jig holder for lapping a spiral groove of a ball screw shaft used in a ball screw device.

The present invention relates to a jig and a jig holder for lapping a ball screw shaft used in a ball screw device, and more particularly, to the nonuniformity of the inner surface of the spiral groove of the ball screw shaft and The present invention relates to a ball screw shaft lapping jig and jig holder which can accurately and neatly grind and grind other foreign matters using a semi-cylindrical lapping jig having a lapping protrusion.

In general, a ball screw device is a mechanism in which a screw screw and a nut are operated with a ball between them, and the rotational motion is converted into linear motion or linear motion into rotational motion. In addition to amplifying the small torque to provide a large thrust, and to enable accurate positioning along the linear direction.

Because of this performance, the ball screw device is widely used as a feeding mechanism for machine tools, semiconductor-related devices, mechanical control devices of aircrafts, industrial robots and other machines and devices requiring high precision.

The ball screw device is formed with a groove having a semi-circular cross section facing each other on the inner circumferential edge of the nut and the outer circumferential edge of the screw shaft, and the grooves of the semi-circular cross-section are joined to each other to form a spiral passage. Done. The ball is inserted into the spiral passage formed by the combination of the nut and the screw shaft, and the screw shaft smoothly rotates inside the nut using the ball as a medium to move forward or retreat to perform a predetermined transfer operation. Mechanical parts to be carried out.

In addition, the nut is equipped with a tube for guiding the ball provided in the helical passage to be returned and continuously supplied in the helical passage so that the rotation of the shaft can be made smoother.

On the other hand, the ball screw device used in a variety of fields as described above requires a ball screw shaft that is precise, high strength, and a spiral groove is formed.

Looking at the manufacturing process of the ball screw shaft, first, the round bar-shaped metal material is cut by a predetermined length or a predetermined length unit, and the cut round bar is made into a cylindrical shape while forming a spiral groove in the outer diameter.

The spiral groove is carried out by a bite in a CNC lathe (Computer Numerical Control lathe), which may include a tapping process to process with a tapping machine.

After the helical groove forming process, the helical groove is protected, and a heat treatment process is performed to enhance the overall strength by improving wear resistance and fatigue resistance of the ball screw shaft. It is used to quench the surface through and quench by spraying cooling water to use the high frequency heat treatment method used to heat only specific surface area.

At this time, the ball screw shaft subjected to the heat treatment process as described above is a non-uniform portion is formed in the surface texture of the metal material, or a non-uniformity of the surface of the spiral groove formed on the outer diameter of the ball screw shaft or other foreign matters will occur.

As described above, when the helical groove of the ball screw shaft used in the ball screw device is not processed to a sufficiently smooth surface, the present invention provides a surface between the helical groove of the ball screw shaft and the ball moving on the helical groove. Peeling phenomenon occurs and the spiral groove is rapidly worn out, shortening the life of the ball screw shaft, irregular ball screw shaft surface and the surface of the spiral groove caused a lot of noise due to the friction of the ball or nut, causing a variety of noise The purpose is to solve this shortened problem.

In addition, in order to solve the above problems, conventionally, after completion of the heat treatment process of the ball screw shaft, the grinding groove of the ball screw shaft by using a rotary tool such as a grinding wheel, or grinding work or lathe machining using cutting and lathe The above operations are not only time-consuming and expensive, but also solve the problem that the spiral groove of the ball screw shaft is not sufficiently uniformly polished.

Therefore, the jig and jig holder for ball screw shaft lapping according to the present invention have been invented to solve the above-mentioned problems, and in particular, at least one flow in the longitudinal direction. The semi-cylindrical body in which the groove is formed is disposed to surround up and down the ball screw shaft in which the spiral groove is formed in the outer circumference, and a wrapping protrusion corresponding to the spiral groove of the ball screw shaft is formed in the inner circumferential portion of the body. A ball screw shaft lapping jig for lapping the spiral groove while the body moves as the ball screw shaft rotates; An inclined surface that decreases toward one side of the inner diameter is formed on the inner circumferential edge, and the contact ring is fitted so that both ends of the jig are caught by the inclined surface, and the contact ring protrudes out of a predetermined area and is placed in the outer circumferential edge of both ends. And a cylindrical hole having a handle part at one side thereof, and a screw thread corresponding to the screw groove at the inner circumferential part thereof, and a blocking plate formed at one side thereof through a central part thereof to couple the both ends of the cylindrical hole while pressing the contact ring. By using a jig holder including a pressure ring, the spiral groove of the ball screw shaft is precisely and uniformly wrapped to minimize the wear and noise of the device and to reduce the lapping processing time and cost. A jig and a jig holder for lapping ball screw shafts are provided.

Ball screw shaft lapping jig and jig holder according to the present invention has the following effects.

Lapping jig (jig) of the present invention is capable of adjusting the radius of the body by the flow groove formed in the jig body, excellent synergistic that can easily easily wrap a variety of ball screw shafts of different diameters with one jig according to the present invention Will have an effect.

The present invention can control the pressure applied to the spiral groove by the jig holder to control the magnitude of the pressure delivered to the jig during the lapping process of the ball screw shaft spiral groove, ball made of a material of various strength It has a remarkable effect that the inner periphery of the helical groove can be wrapped by a pressure appropriate to each screw shaft.

In addition, the present invention uniformly wraps the surface of the ball screw shaft and the inner circumferential edge of the spiral groove with the lapping jig and jig holder of the present invention with high precision, thereby further increasing the precision of the ball screw device and friction between the ball screw shaft and the nut. It has a remarkable effect to minimize the noise caused by.

1 is a schematic diagram showing the lapping process of a ball screw shaft according to the present invention.
Figure 2 is a schematic view of the jig for screw ball shaft wrapping according to the present invention.
3 and 4 is a fastening and schematic diagram of the ball screw shaft lapping jig holder according to the present invention.
5 and 6 are cross-sectional views showing the process of lapping the spiral groove of the ball screw shaft using the jig and jig holder of the present invention.

The present invention relates to a jig and a jig holder for lapping a spiral groove of a ball screw shaft used in a ball screw device, and more particularly to the ball screw shaft. The ball screw is subjected to lapping processing such as grinding and grinding by using a semi-cylindrical jig having a lapping protrusion and a jig holder capable of supporting and pressing the jig formed therein. Regarding the jig and jig holder for lapping the ball screw shaft, which can not only smoothly and precisely process the spiral groove of the shaft, but also wrap the ball screw shaft manufactured with various radii and strengths using a single jig and jig holder. will be.

Hereinafter, a ball screw shaft wrapping jig and a jig holder according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 6 is a schematic diagram of the lapping jig and jig holder according to the present invention is fastened to the ball screw shaft of the ball screw device for lapping the spiral groove of the ball screw shaft, jig according to the present invention ) And a jig holder and a cross-sectional view thereof.

First, a ball screw shaft 1 is used for a ball screw device and a spiral groove 1a is formed in the outer circumference. The ball screw shaft (1) is rotated by one end connected to the rotation motor by a machine unit such as a lathe.

At this time, the surface of the helical groove (1a) of the ball screw shaft (1) formed through the heat treatment and tapping process is uniform, and lapping processing, which is a polishing process for removing foreign matters, is performed. The lapping jig 10 according to the present invention used for lapping processing such as smooth grinding and grinding of the helical groove 1a of the helical groove 1a of the ball screw shaft 1 is shown in FIG. As described above, the ball screw shaft 1 is formed in a semi-cylindrical shape having an inner diameter larger than the outer diameter of the ball screw shaft 1, and a lapping protrusion 11 corresponding to the helical groove 1 a of the ball screw shaft 1 is formed at an inner circumferential portion thereof. A) is formed.

Therefore, in order to lathe the spiral groove 1a of the ball screw shaft 1 as quickly and precisely as possible, two semi-cylindrical jigs 10 are provided to provide the outer periphery of the ball screw shaft 1. The ball screw shaft (1) is wrapped so as to be in close contact with each other at the top and bottom or front and rear sides of the ball screw shaft (1).

At this time, the wrapping projection 11 of the jig 10 is positioned so as to mesh well with the helical groove 1a formed on the outer periphery of the ball screw shaft 1, according to the rotation of the ball screw shaft (1) The lapping protrusion 11 laaches the inner circumferential surface of the helical groove 1a while moving horizontally on the ball screw shaft 1.

On the other hand, the jig 10 of the present invention is a flow groove (10a) is formed in the longitudinal direction of the body, the flow groove (10a) is formed up to about 2/3 point in the longitudinal direction of the jig 10 body It serves to vary the radius of the jig 10 according to the pressure of the jig holder 20 to be described later.

Therefore, the jig 10 of the present invention can be reduced or restored to the original radius of the body by the flow groove (10a), the jig 10 according to the present invention to the various ball screw shaft 1 of different diameters ) Has a remarkable effect of being easily and easily lapping.

On the other hand, the jig (10) is supported on the ball screw shaft (1) by the jig holder (jig holder) 20 described above to move horizontally, the jig holder (jig holder) 20 of the present invention is shown in FIG. 3 to 4, an inclined surface 22a having an inner diameter decreases toward one side is formed at the inner circumferential edge, and the contact ring 22 is fitted at both ends of the jig 10 so as to be caught by the inclined surface 22a. and; The contact ring 22 is placed so that the outer end is projected to the outside of the predetermined area, a screw groove (21b) is formed on the outer periphery of both ends, the cylinder port 21 is provided with a handle portion (21a) on one side; And a screw thread 23b corresponding to the screw groove 21b is formed at the inner circumferential portion and coupled to the cylindrical hole 21, and one side is formed with a blocking plate 23a having a central portion penetrating the cylindrical hole 21. When combined with the blocking plate 23a is a pressing ring 23 for pressing the one end of the contact ring 22 in close contact; is made.

In addition, a handle portion 21a for gripping is formed at one side of the cylindrical port 21 to support and move the jig 10 and the jig holder on the ball screw shaft 1.

That is, the jig holder (jig holder) of the present invention to support and move the jig 10 to the ball screw shaft (1), the jig 10 and the contact ring 22 in the cylindrical sphere (21) ) Is sequentially inserted, and the pressing ring 23 is coupled to both ends of the cylindrical opening 21 in which the jig 10 and the contact ring 22 are inserted to press the contact ring 22. The jig 10 of the present invention is pressed.

At this time, the contact ring 22 is inserted into the cylindrical sphere 21 and presses the outer circumferential edges of both ends of the jig 10, and one end thereof protrudes a predetermined area to the outside of the cylindrical sphere 21. One end of the contact ring 22 protruding to the outside of the sphere 21 is hit by the blocking plate 23a of the pressure ring 23 to be pushed into the cylindrical sphere 21, the cylindrical sphere 21 The inclined surface of the inner circumference of the contact ring 22 that is pushed into the inside presses the outer end of the jig 10 so that the flow groove 10a formed in the jig 10 is narrowed, so that the radius of the jig 10 of the present invention is narrowed. The lapping protrusion 11 presses the spiral groove 1a of the ball screw shaft 1 so as to be pressed to form a lapping process.

As described above, the present invention is a spiral groove formed in the ball screw shaft (1) in accordance with the rotational speed (locking or unlocking) of the pressure ring 23 is coupled to both ends of the cylindrical sphere 21 in a nut manner ( The magnitude of the pressure for the lapping process of 1a) is determined.

In addition, as shown in Figure 4, the jig holder 20 of the present invention, at least for facilitating the rotation of the pressure ring 23 for locking and unlocking coupling such as screwing to the cylindrical sphere 21. One support rod 30 is connected to the pressure ring 23, the user can hold the support rod 30 to rotate the pressure ring 23 to be able to simply apply a suitable pressure to the jig 10 easily do.

Therefore, the jig 10 and the jig holder 20 of the present invention, the nut method in the cylindrical hole 21 of the jig holder 20 during lapping of the ball screw shaft (1) spiral groove (1a) By the pressure ring 23 to be coupled to the pressure can be adjusted to the size of the pressure transmitted to the jig 10, thereby adjusting the pressure applied to the spiral groove (1a) by the lapping projection 11, various diameters And it has a remarkable effect of lapping the inner periphery of the spiral groove (1a) at a pressure suitable for each of the ball screw shaft (1) made of a material of various strengths.

Next will be described in detail a preferred embodiment of the jig and jig holder for ball screw shaft wrapping according to the present invention configured as described above.

First, the pair of jig 10 of the present invention is in close contact with the outer circumferential edge of the ball screw shaft 1 to the ball screw shaft 1 in which the helical groove 1a is formed at the outer circumferential edge thereof. After the lapping protrusion 11 is correctly inserted into 1a), the lapping protrusion 11 may be brought into close contact with each other on the upper and lower sides or front and rear sides of the outer periphery of the ball screw shaft 1.

Both ends of the pair of jigs 10 in close contact with the outer circumferential edge of the ball screw shaft 1 are fitted with a contact ring 22 having an inclined surface formed at the inner circumferential edge, and the jig with the contact ring 22 fitted at both ends. 10 inserts and settles inside the cylindrical opening 21 which penetrated the inside.

Accordingly, the ball screw shaft 1, the jig 10, and the contact ring 22 are sequentially settled in the cylindrical sphere 21.

Thereafter, the pressure ring 23 is coupled to both ends of the cylindrical sphere 21, and the holding ring 30 formed on one side of the pressure ring 23 is gripped with the cylindrical ring 21 by the pressing ring ( Lock 23) clockwise or rotate to release counterclockwise. At this time, the jig 10 of the present invention is the width of the flow groove (10b) by the contact ring 22 to move forward or backward in the cylinder sphere 21 in accordance with the rotation direction of the pressure ring (23) It is narrowed or restored to adjust the pressure transmitted to the spiral groove 1a of the ball screw 1.

When the pressure to be delivered to the ball screw shaft (1) is adjusted as described above, one end of the ball screw shaft (1) is connected to the rotating motor and fixed so as not to move or bend to a work unit such as a lathe.

The ball screw shaft 1 is rotated by driving a rotation motor connected to the ball screw shaft 1.

As the ball screw shaft 1 rotates in place by the rotation motor, the jig holder 20 in which the jig 10 is seated is horizontally moved on the ball screw shaft 1, and the jig 10 By the horizontal movement, the lapping protrusion 11 of the jig 10 performs lapping processing of grinding and grinding the spiral groove 1a of the ball screw shaft 1 at a set pressure.

Accordingly, the jig 10 of the present invention simply wraps various ball screw shafts 1 having different diameters with one jig 10 by varying the radius of the body by the flow groove 10a. ) Can be processed, and can adjust the magnitude of the pressure transmitted to the spiral groove (1a) formed of the ball screw shaft (1) to a pressure suitable for each of the ball screw shaft (1) made of a material of various strength It has a remarkable effect of lapping the inner periphery of the helical groove 1a.

In the above, the specific Example of this invention was described above. However, the spirit and scope of the present invention is not limited to these specific embodiments, and various modifications and variations can be made without departing from the spirit of the present invention. Those who have it will understand.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

1: Ball screw shaft 1a: Spiral groove
10: jig 10a: flow groove
11: lapping protrusion 20: jig holder
21: cylinder 21a: handle portion
21b: screw groove 22: contact ring
23: pressure ring 23a: blocking plate
23b: screw thread 30: support rod

Claims (3)

The semi-cylindrical body in which at least one flow groove is formed in the longitudinal direction is disposed to surround up and down the ball screw shaft in which the spiral groove is formed at the outer circumference, and the inner circumference of the body corresponds to the spiral groove of the ball screw shaft. Lapping jig for ball screw shaft wrapping, characterized in that the projection is formed to wrap the spiral groove while the body moves in accordance with the rotation of the ball screw shaft (lapping).
The method of claim 1,
Ball body shaft lapping jig characterized in that the body is formed with at least two flow grooves mutually cross in the longitudinal direction.
An inner ring decreases toward one side to form an inclined surface at an inner circumferential edge, and an adhesive ring in which both ends of the ball screw shaft wrapping jig of claim 1 or 2 are fitted to be pressed against the inclined surface;
A cylindrical hole in which the contact ring protrudes out of a predetermined area, is formed with screw grooves at outer periphery of both ends, and a handle part is provided at one side; And
The inner periphery is formed with a screw thread corresponding to the screw groove, one side is formed with a blocking plate penetrating the center portion, the blocking plate is pressed to the two sides of the cylindrical sphere while pressing the contact ring; Jig holders for wrapping ball screw shafts.

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