KR20110120097A

KR20110120097A - Super finishing apparatus

Info

Publication number: KR20110120097A
Application number: KR1020100039620A
Authority: KR
Inventors: 정영석
Original assignee: 정영석
Priority date: 2010-04-28
Filing date: 2010-04-28
Publication date: 2011-11-03

Abstract

PURPOSE: A super-finishing apparatus is provided to facilitate the initial setup of workpieces by maintaining the constant pressure of a super-finishing wheel against the curved surface orbit of workpieces. CONSTITUTION: A super-finishing apparatus(2) comprises a super-finishing wheel(6), a wheel axle(8), a pressure holding unit(10) and a damper. The super-finishing wheel processes a workpiece(4). The super-finishing wheel is installed in the wheel axle. The wheel axle is connected to the piston rod of a pressurizing cylinder. The pressure holding unit operates the pressurizing cylinder through a pressure driving unit(12) with the hydraulic pressure and maintains a present processing location of the super-finishing wheel. The elastic body of a damper is inserted in the cylinder main body of a pressurizing cylinder into the piston rod. The damper minutely adjusts the present processing location of the super-finishing wheel.

Description

Super Finishing Device {SUPER FINISHING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for a super finishing process, and more particularly to a super finishing apparatus capable of maintaining a constant pressing force with respect to a curved track of a workpiece.

In general, the surface roughness and roundness of spherical parts are very important factors for the workpieces with curved tracks such as ball studs, bearing hubs, and bearing inner and outer rings.

Workpieces with curved orbits, such as ball studs, are first machined into spherical shapes and then subjected to a separate rolling process for surface roughness and gloss, or after finishing first in an existing automatic lathe. The surface of the spherical surface is processed with super precision.

However, the processing method using the rolling process has a problem such that a large number of defects in the unmolding and roundness occurs.

In addition, the machining method using the superfinishing device has a problem that it is difficult to superfinish according to the correct surface trajectory by circular interpolation used during general turning because the radius of the contact portion of the superfinishing wheel is larger than the general turning bite.

In particular, when the initial setup for the super finishing process is not easy to correct the position of the super finishing wheel, the super finishing wheel is damaged due to the impact, and it is difficult to control the roundness required for the manufacturing standard of the workpiece. Since it is impossible to maintain a constant pressing force on the curved track of the workpiece, there is a problem in that an uneven portion or an unmolded portion is generated in the surface portion.

Therefore, an object of the present invention, the super finishing wheel to maintain a constant pressing force on the curved surface at all times during the super finishing process to facilitate the initial set-up of the workpiece, finely control the surface roughness and roundness of the workpiece It is possible to provide a super finishing device capable of preventing the super finishing wheel from being damaged.

In the super finishing device of the present invention for achieving the above object, in the super finishing device, the super finishing wheel for processing the workpiece is mounted on the wheel shaft, the wheel shaft is connected to the piston rod of the pressure cylinder The pressure driving part constitutes a pressure holding part for operating the pressure cylinder by the fluid pressure to maintain the suspension position of the super finishing wheel, and inserting an elastic body into the piston rod in the cylinder body of the pressure cylinder to install the super finishing wheel. It characterized in that it comprises a damper to finely adjust the suspension machining position of the.

The present invention allows the super finishing wheel to maintain a constant pressing force on the curved surface at all times to facilitate the initial set-up of the workpiece during the super finishing process, finely control the surface roughness and roundness of the workpiece, There is an advantage that can prevent the super finishing wheel from being damaged due to the impact when contacting the uneven surface or unformed portion of the.

1 is a block diagram of a super finishing apparatus according to an embodiment of the present invention,
Figure 2 is a perspective view of the main part of the super finishing apparatus according to an embodiment of the present invention,
3 is a perspective view of a super finishing wheel according to an embodiment of the present invention,
4 is an operation of the main part according to an embodiment of the present invention,
5 to 7 is an operation of the fluid piston pump according to an embodiment of the present invention.
<Explanation of symbols for the main parts of the drawings>
4: Workpiece 6: Super Finishing Wheel
8: wheel axle 10: pressure holding unit
12: pressure driving unit 16: pressure cylinder
18: piston 20: damper
22: fluid piston pump 24: oil tank
26: fluid supply pipe 28: fluid discharge pipe
36: cooling hole 42: pressure valve
46: pressure check valve 48: relief valve
50: suction check valve

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention allows the super finishing wheel to maintain a constant pressing force at all times when contacting the curved surface of the workpiece to facilitate the initial setup of the workpiece during the super finishing process, and to finely control the surface roughness and roundness of the workpiece.

1 is a block diagram of a super finishing apparatus according to an embodiment of the present invention, Figure 2 is a perspective view of the main part of the super finishing apparatus according to an embodiment of the present invention, Figure 3 is a super finishing according to an embodiment of the present invention A perspective view of a wheel. And, Figure 4 is an operation of the main part according to an embodiment of the present invention, Figures 5 to 7 is an operation of the fluid piston pump according to an embodiment of the present invention.

The super finishing apparatus 2 according to the embodiment of the present invention shown in FIG. 1 has the super finishing wheel 6 shaft mounted on the wheel shaft 8, and the wheel shaft 8 is the piston rod of the pressure cylinder 16. A pressure holding unit 10 which is connected to 18a and operates the pressure cylinder 16 by fluid pressure to maintain the suspension position of the super finishing wheel 6, and the cylinder body of the pressure cylinder 16; The damper 20 which inserted the elastic body in the piston rod 18a is provided in 14.

The super finishing wheel 6 for processing the workpiece 4 is formed of a cemented carbide material obtained by sintering a high strength metal material, as shown in FIGS. 2 and 3. The super finishing wheel 6 is formed by forming a wheel boss 30 in which the wheel shaft 34 is installed in the center of the wheel body. The wheel body has a shoulder portion 32 is formed to extend to the left and right of the wheel boss 30. In the embodiment of the present invention, the super finishing wheel 6 to avoid interference between the super finishing wheel 6 and the workpiece 4 according to the shape of the curved track of the workpiece 4 during the super finishing process and to provide an optimum process condition. The outer diameter of the wheel boss, the outer diameter and inner diameter of the wheel boss 30, the shoulder portion 32, the thickness of the wheel body, etc. are configured to be selected and used in various dimensions and ratios.

In addition, a plurality of cooling holes 36 are formed in the wheel body so as to effectively dissipate heat generated in the super finishing wheel 6 when contacting the curved trajectory of the workpiece 4. Cooling holes 36 may be formed concentrically on the outer surface of the shoulder portion 32 of the wheel body. The cooling holes 36 serve to improve the durability of the super finishing wheel 6 and extend its life.

Such a super finishing wheel 6 is fitted to the wheel shaft 8 and is axially installed. The wheel shaft 34 is installed on the wheel boss 30 of the super finishing wheel 6. The wheel shaft 8 on which the super finishing wheel 6 is axially connected is connected to the pressure holding unit 10 which maintains the suspension position of the super finishing wheel 6 by fluid pressure.

The pressure holding unit 10 pressurizes the pressurized cylinder 16 having the piston 18, the damper 20 inserted into the piston rod 18a in the cylinder body 14 of the pressurized cylinder 16, and the fluid pressure. It consists of a pressurizing drive part 12 for operating the cylinder 16.

The pressure cylinder 16 is configured to be housed in the cylinder body 14. As shown in FIG. 4, a piston 18 is installed below the pressure cylinder 16 in the cylinder body 14, and a damper 20 is inserted into the piston rod 18a. The pressure cylinder 16 reciprocates up and down by the pressure driving unit 12 and pressurizes and depresses the piston 18. As the piston 18 of the pressure cylinder 16 is pressurized, the super finishing wheel 6 axially mounted on the lower wheel shaft 8 of the cylinder body 14 maintains the suspended position and allows the workpiece 4 to be processed. do. In this case, the pressing force pressurized on the workpiece 4 is set by a program set in advance according to the hardness and curvature of the material of the workpiece 4. However, when relying only on such a setting program, the non-contact surface of the super finishing wheel 6 is generated on the curved surface of the workpiece 4, and the workpiece 4 is uncontacted by the non-contact surface of the super finishing wheel 6. Problems such as poor roundness or unmolding will occur.

Therefore, in the embodiment of the present invention, as shown in Figure 4, the cylinder body 14 further includes a damper 20 formed by inserting an elastic body into the piston rod 18a. The damper 20 inserted into the piston rod 18a serves to absorb the micro impact when the super finishing wheel 6 contacts the workpiece 4 and to maintain a constant pressing force on the workpiece 4 at all times. do. The elastic body inserted into the piston rod 18a may be formed by insulting the spring 40 on the elastic member 38 such as urethane so as to smoothly perform the damper function.

The pressure driving unit 12 operates the pressure cylinder 16 at a preset pressing force according to the hardness and curvature of the material of the workpiece 4 so that the super finishing wheel 6 processes the workpiece 4. The pressure driving unit 12 is configured by connecting a fluid piston pump 22 having a constant pressing force setting function to the oil tank 24 by using compressed air of 5 to 10 /.

As shown in FIGS. 5 to 7, the fluid piston pump 22 of the pressure driving unit 12 is vertically blocked along the upper and lower cylinders 52 and the center rod 54 formed inside the cylinder 52. And a cycling valve piston 62 reciprocating up and down along a cycling valve cylinder 60 fixed to the inside of the cycling piston 58 and a cycling piston 58 protruding from the bottom. It is composed.

The fluid piston pump 22 cycles by blocking the air flow passage 66 formed between the cycling piston head 64 and the cycling piston head 64 during air compression through the operation chamber 72 above the cylinder 52. The piston 58 and the cycling valve piston 62 are lowered together along the center rod 54, and when descending, the air flow control hole 70 of the center rod 54 is opened by the cycling valve 68. When the cycling valve piston 62 rises from 58, the air flow passage 66 is opened, so that the compressed air is discharged through the lower operation chamber 74, and the cycling valve piston 62 is discharged when the compressed air is discharged. The cycling piston 58 is repeatedly reciprocated up and down by the bulginger 56 protruding from the lower end of the cycling piston 58 to repeat the operation of rising and returning by the elastic force of the juice spring 76.

Fluid in the oil tank 24 connected to the lower side of the fluid piston pump 22 by the up and down reciprocating operation of the fluid piston pump 22 as described above is sent to the pressure cylinder 16 through the fluid supply pipe 26 to the piston 18. ) Or the fluid of the pressure cylinder 16 is sent back to the oil tank 24 through the fluid discharge pipe 28 to depressurize the pressure cylinder (16).

In this case, the suction check valve 50 is installed at the connection portion between the oil tank 24 and the fluid piston pump 22, and the pressure check valve 46 is disposed at the connection portion between the fluid piston pump 22 and the fluid supply pipe 26. Installed so that the fluid in the oil tank 24 pressurized by the fluid piston pump 22 flows only through the fluid supply pipe 26 to the pressure cylinder 16. In addition, a pressure valve 42 is installed at the connection portion between the fluid supply pipe 26 and the cylinder body 14 to generate hydraulic pressure in the pressure cylinder 16 to pressurize the piston 18. In addition, a relief valve 48 is installed at the connection portion between the fluid discharge pipe 28 and the cylinder body 14 to finely control the initial pressing force.

Now, the operation of the super finishing apparatus 2 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 7.

The user opens the pressure valve 42 to generate a preset pressing force according to the hardness and curvature of the material of the workpiece 4 from the pressure driving part 12. In this case, the initial pressing force may be finely adjusted by using the relief valve 48. Initially set pressing force lowers the pressure cylinder 16 of the cylinder body 14 to pressurize the piston 18, and the damper 20 inserted into the piston rod 18a adjusts the suspension position of the super finishing wheel 6. Fine tune

Reference numeral 78 is a silencer.

According to the above configuration, the super finishing device 2 according to the embodiment of the present invention always maintains a constant pressing force even at a minute portion of the workpiece 4 that cannot be corrected by a program preset in the pressure driving unit 12. It is possible to form the surface of the smooth workpiece 4 without interruption.

In addition, it is possible to solve the problem that the super finishing wheel 6 breaks due to impact when the super finishing wheel 6 contacts the curved track of the workpiece 4 for the initial setup in the super finishing process.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and utility model claims.

Claims

In the super finishing process
In the manufacture of bolsters, after finishing the first spherical surface, the super finishing process is performed simultaneously without moving the process.In the super finishing process, the superburning wheel generates a pressing force that maintains constant contact with the curved track surface at all times according to the shape of the curved surface. A superburning method for the superfinishing process that basically solves the problems of tool damage, poor roundness, and unmolding due to the impact at the time of setup for the process.

In the super finishing device,
The super finishing wheel for processing the workpiece is mounted on the wheel shaft, the wheel shaft is connected to the piston rod of the pressure cylinder, and the pressure driving part operates the pressure cylinder with fluid pressure to adjust the suspension position of the super finishing wheel. And a damper for finely adjusting the suspension position of the super finishing wheel by inserting an elastic body into the piston rod in the cylinder body of the pressure cylinder.

The method of claim 2,
A fluid supply pipe having a pressure valve and a fluid discharge pipe having a relief valve are connected to the cylinder body of the pressure holding unit, the fluid supply pipe is connected to a fluid piston pump, and the fluid discharge pipe is connected to the fluid piston pump through an oil tank. Super finishing device characterized in that the configuration.

The method of claim 3,
The super finishing wheel has a wheel boss in which a wheel shaft is installed on the wheel body, and the outer diameter of the super finishing wheel, the outer diameter and the inner diameter of the wheel boss, the shoulder portion, and the thickness of the wheel body can be selected and used in various dimensions and ratios. To be. The wheel finishing apparatus, characterized in that the cooling holes are formed concentrically arranged.

The method according to any one of claims 2 to 4,
The elastic body constituting the damper is a super-finishing device, characterized in that the spring to the urethane member to the urethane member and the spring can be constructed at the same time.