JPH0561072B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a super-finishing machine for super-finishing the outer and inner diameter surfaces of shaft-shaped members and cylindrical members.

BACKGROUND ART Superfinishing is performed to finish the outer diameter surface or inner diameter surface of a shaft-like member or a cylindrical member with high precision. In super-finishing, a grindstone is pressed against the workpiece surface,
Pressure is applied by vibrating the grindstone in the axial direction and moving the grindstone over the entire length of the workpiece while rotating the workpiece.

As shown in FIG. 6, for example, a super-finishing machine that performs super-finishing is provided with a chuck mechanism 3 for holding and rotating a workpiece 1 on an apparatus main body 2, and a tailstock 4 facing the chuck mechanism 3. A superfinishing unit 6 is provided between the chuck mechanism 3 and the tailstock 4 on a workbench 5 which is movable in the axial direction and orthogonal direction. The superfinishing unit 6 consists of a vibration mechanism 7 that generates vibrations, a pressure mechanism 8 held by the vibration mechanism 7, and a grindstone 9 held by the pressure mechanism 8. Reference numeral 10 denotes a tank containing working fluid, and the working fluid is pumped out from the tank 10 by a pump 11 provided at the top and is injected to the tip of the grindstone 9 through a hose 12.

The super finishing machine holds a workpiece 1 with a chuck mechanism 3 and a tailstock 4, and a grindstone 9 with a pressure mechanism 8.
is pressed against the workpiece 1, and in this state, the pump 11 is operated to apply working fluid to the contact area between the grindstone 9 and the workpiece 1, and the vibration mechanism 7 vibrates the pressure mechanism 8 to vibrate the grindstone 9 in the axial direction. While rotating the workpiece 1, the workbench 5 is moved in the axial direction and the grindstone 9 is moved over the entire length of the workpiece 1, thereby processing the workpiece 1.

Problems to be Solved by the Invention During machining, the above processing machine supplies working fluid to the contact surface between the workpiece 1 and the grindstone 9, but since the workpiece 1 and the grindstone 9 are in close contact, there is sufficient space between them. Grindstone grains and workpiece 1 generated during machining due to insufficient working fluid being supplied.
There was a problem in that the fine particles were not sufficiently discharged, causing the grinding wheel 9 to become clogged, resulting in a reduction in machining ability or the grinding wheel becoming unusable before the end of its life. Further, there was a problem in that the surface of the workpiece 1 was damaged by the grindstone grains and minute debris, resulting in a reduction in machining accuracy.

Means for Solving the Problems This invention provides a grindstone for grinding the surface of a workpiece,
A pressure mechanism that holds and presses the grindstone against the workpiece, and a vibration mechanism that vibrates the pressure mechanism, which presses the grindstone against the rotating workpiece and causes the grindstone to vibrate in a direction parallel to the rotation axis of the workpiece. In a super finishing machine that precisely finishes the cylindrical surface of a workpiece, the contact surface of the grindstone with the workpiece is an arcuate surface,
A through hole opening in the center is formed in a direction substantially perpendicular to the rotation axis of the workpiece, and the working fluid is spouted from this through hole.

Function During operation, the super finishing machine with the above configuration spouts a large amount of working fluid from the inside of the grindstone to the center between the contact surfaces between the grindstone and the workpiece, and transfers this jetted working fluid between the contact surfaces. Flowing forcefully from the center to the surroundings,
This is designed to sequentially wash away grindstone grains and fine debris from the workpiece that accumulate between the grindstone and the workpiece.

Embodiment FIG. 1 is a drawing showing an embodiment of the present invention, in which the outer diameter surface of a workpiece 1 is machined. In the figure, reference numeral 20 denotes a pressurizing mechanism, which has a pressurizing cylinder (not shown) built in a housing 21, and has a piston rod 22 protruding from the housing 21. 23 is an adapter attached to the tip of the piston rod 22, which has a fitting groove 24 formed on the front side and a fitting hole 25 formed on the rear side;
is fitted onto the tip of the piston rod 22 and connected to the adapter 23 with a set screw 26. Further, the tip of a guide bar 28 is fitted into the upper end flange 27 of the adapter 23 and connected with a set screw 29, and the rear end of the guide bar 28 is slidably inserted into the housing 21. It is designed to prevent rotation.
30 is a grindstone holder, which fits into the fitting groove 2 of the adapter 23.
4, and has a support step 31 formed at the lower front surface and a mounting step 32 formed at the upper surface. Also, there is an L inside the whetstone holder 30 when viewed from the top.
A shaped communication hole 33 is formed, one of which is opened on the side surface, and the other is opened at the center of the front surface. The rear part of this grindstone holder 30 is fitted into the fitting groove 24 of the adapter 23, and is fixed with a set screw 34 tightened to the upper surface of the adapter 23. 35 is a whetstone,
As shown in FIG. 2, it is a flat rectangular parallelepiped, the front surface is formed into an arcuate surface along the outer diameter surface of the workpiece 1, and a through hole 36 is bored in the center portion in the front-rear direction. This grindstone 35 has its rear part connected to the support step 3 of the grindstone holder 30.
1, the through hole 36 is communicated with the communication hole 33 of the whetstone holder 30, the presser foot 37 is mounted on the mounting step 32 of the whetstone holder 30, and the mounting bolt 38 is placed on the grindstone holder 30.
The presser foot 37 is fixed to the grindstone holder 30, and the front end pressing portion 37a of the presser foot 37 presses the grindstone 35 so that it is held between the support step portion 31 of the grindstone holder 30. A hose (not shown) is connected to the flow hole 33 of the grindstone holder 30 to supply working fluid.

Note that the pressure mechanism 20 is held by a vibration mechanism as in the conventional case.

During machining, the processing machine equipped with the pressure mechanism 20 having the above structure extends the piston rod 22 of the pressure cylinder to press the tip of the grindstone 35 against the outer diameter surface of the workpiece 1, and pumps the working fluid into the flow hole of the grindstone holder 30. 33 and from the flow hole 33 to the through hole 36 of the grindstone 35, the working fluid is spouted between the grindstone 35 and the workpiece 1 at the center of the grindstone 35. After that, the workpiece 1 is rotated and the grinding wheel 35 is vibrated in the axial direction.
5 is moved over the entire length of the workpiece 1 to perform processing.

During the above machining, the working fluid is spouted from the center of the grinding wheel 35 between the grinding wheel 35 and the workpiece 1, and flows from the center of the grinding wheel 35 to the periphery of the grinding wheel 35, and the working fluid is sprayed from the center of the grinding wheel 35 to the periphery of the grinding wheel 35, and the working fluid is sprayed from the center of the grinding wheel 35 to the periphery of the grinding wheel 35. Grinding debris is washed away together with the working fluid, and the space between the grinding wheel 35 and the workpiece 1 is always kept clean, allowing highly accurate machining.

3 to 5 are drawings showing other embodiments,
This shows the case where the inner diameter surface of the cylindrical workpiece 40 is superfinished. As shown in the figure, the adapter 41 is formed into a U-shape when viewed from above, and its one end 41a is fitted into the piston rod 22 of the pressure cylinder and integrally connected with the mounting bolts 42, 42, and the other end A whetstone 43 is attached to 41b, and the whetstone 43 is fixed with a presser foot 45 attached to the upper surface of the other end with bolts 44, 44. The other end 41b of the adapter 41 is formed with a flow hole 46 through which the working fluid flows. The end surface of the grindstone 43 is formed into an arcuate surface with a protruding center along the inner diameter surface of the workpiece 40, and a through hole 47 through which the working fluid flows is formed in the center. The through hole 47 is communicated with the communication hole 46 of the adapter 41. 48 is a guide bar.

In the above embodiment, during machining, the piston rod 22 of the pressurizing cylinder is attracted, and the working fluid is jetted from the flow hole 46 through the through hole 47 to the center of the grindstone 43, and the machining is performed in the same manner as in the above embodiment.

Effects of the Invention This invention squirts a large amount of working fluid from the center of the grindstone to the contact surface between the grindstone and the workpiece during processing.
Since the spouted working fluid is vigorously discharged from the periphery of the grinding wheel and workpiece, the working fluid can be effectively distributed over the entire area between the grinding wheel and the workpiece, and the working fluid can be removed from the grinding wheel grains and workpiece generated during machining. Grinding debris can be sequentially washed away and removed reliably.
Therefore, the surfaces of the grindstone and workpiece are always kept clean, and clogging of the grindstone is prevented, allowing highly accurate super finishing. In addition, the through-hole of the grinding wheel is formed in a direction almost perpendicular to the rotational axis of the workpiece, so even if the grinding wheel becomes short due to wear, it is possible to eject the working fluid, extending the tool life and providing long-term use. High precision processing is possible.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing an example of the pressure mechanism of a superfinishing machine according to the present invention, FIG. 2 is a perspective view of a grindstone, and FIG. 3 is a plan view showing another embodiment of the pressure mechanism. , Figure 4 is its front view, Figure 5 is Figure 4 V-V
A sectional view taken along the line, and FIG. 6 is a front view showing an example of a super finishing machine. DESCRIPTION OF SYMBOLS 1... Workpiece, 20... Pressure mechanism, 22... Piston rod, 23... Adapter, 24... Fitting groove, 30... Grinding wheel holder, 33... Distribution hole, 3
5... Grindstone, 36... Through hole, 37... Presser foot.

Claims (1)

[Claims] 1 A grindstone that grinds the surface of a workpiece, a pressure mechanism that holds and presses the grindstone against the workpiece, and a vibration mechanism that vibrates the pressure mechanism, which presses the grindstone against the rotating workpiece and presses the grindstone against the workpiece. In a super-finishing machine that precisely finishes the cylindrical surface of a workpiece by applying vibration in a direction parallel to the rotation axis of the grindstone, the contact surface of the grindstone with the workpiece is an arcuate surface, and a through hole opening in the center of the grindstone is provided. A super-finishing machine characterized by a through-hole formed in a direction substantially perpendicular to the rotational axis of a workpiece, and a working fluid jetted out from the through-hole.