JPS58149176A - Abrasive grain finishing tool - Google Patents

Abstract

PURPOSE:To efficiently perform rough finishing and fine finishing without changing grinding stones by means of one abrasive grain finishing tool in such a way that a fine finishing grinding stone is fitted through a resilient member to the stand metal on which a rough finishing grinding stone is fixed. CONSTITUTION:A rough finishing grinding stone 16 is fitted to an inside fitting seat 14 of a stand metal 11, a fine finishing ginding stone 20 is fitted through a coil spring body 18 to an outside fitting seat 15, a little gap is provided between the both grinding stones 16 and 20, and the finishing side 21 of the fine finishing grinding stone 20 is protruded from the finishing side 17 of the rough finishing grinding stone 16, in the condition that the grinding stones are not in contact with a side 4 to be finished, the both finishing sides 17, 21 are brought into contact with the side 4 to be finished at the same level and the side 4 to be finished is roughly finished. Then, thrust of the grinding stones is weakened, only the finshing side 21 of the fine finishing grinding stone 20 is brought into contact with the side 14 to be finished, the finishing side 17 of the rough finishing grinding stone 16 is not brought into contact with the side 14 to be finished, and the side 4 to be finished is finely finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an abrasive processing tool suitable for planar superfinishing, which includes a roughing grindstone and a finishing grindstone.

[Technical background of the invention]

Conventionally, the abrasive processing tools used for flat surface superfinishing, that is, grinding wheels, are stick-shaped or annular. (1) It is made up of a hardened K cylindrical grindstone (2), and the flat end surface is used as the processing surface (3), and the grinding wheel is pressed against the surface to be processed (4) while sliding to perform the processing. and rough grinding wheels depending on the stage of processing.

It is used for different purposes such as finishing whetstones. '1. ．．
L, changing the processing conditions with one type of whetstone)・
1. Therefore, rough machining and finishing machining are also widely used.In general, super finishing machining focuses on improving machining accuracy such as surface roughness and flatness, but rounding is a machining process, and machining efficiency is significantly lower than other machining processes. It is.

To improve this efficiency, rounding with a type of grindstone has been adopted as mentioned above, but it does increase the efficiency to some extent during rough machining, but if anything, the grindstone's eyeglass The effect of stopping the grinding is large, and there is a natural limit to the machining efficiency with one type of whetstone. Rounding to increase efficiency requires two machines and two processing heads, which is disadvantageous in that it requires a large amount of equipment cost.

゛, [Object of the Invention] An object of the present invention is to provide an abrasive machining tool that efficiently performs rough machining and finishing machining with one machine.

[Summary of the invention]

The present invention has a structure in which a roughing grindstone is attached to an alloy, and a finishing grindstone is attached to a base metal via an elastic body such as a spring, so that the processing surface of the finishing grindstone is closer to the surface to be processed than the processing surface of the roughing grindstone. This is an abrasive processing tool that can protrude and retract freely.

Note that the terms "rough grinding wheel" and "finishing grindstone" represent relative distinctions between grindstones; for example, "finishing grindstone" does not necessarily mean a processing grindstone for the final process.

[Embodiments of the invention]

The details of the present invention will be explained by way of examples shown in Figures 2 to 4.

The base metal Ql) is formed almost in the shape of a disk, and has a mounting hole in the center for attaching it to the processing equipment, and has a seat (13) protruding on the - side for attachment to the equipment, and on the other side. The annular inner mounting has a step I, and the annular outer mounting has a seat α field.The inner mounting has a cylindrical rough machining grindstone αe attached to the seat I. forms a flat machining surface αη.A coil spring body Q8 as an elastic member is attached to the outer seat αe, and a cylindrical finishing grindstone ( ) is attached, and its end surface forms a flat machined surface Qυ.A slight gap is provided between the roughing grindstone αe and the finishing grindstone (4), and the coil spring Due to the elasticity of the body (1 fathom), the finishing whetstone (■) is configured to be freely displaceable in the direction of the rotation axis (2).In other words, when the whetstone is not in contact with the surface to be processed (4), the finishing whetstone (1) ) has a machined surface that protrudes from the machined surface αη of the rough machining wheel αe, and the machined surface can elastically protrude and retreat.Figure 3 shows the pressing force of the grindstone and the coil. This graph shows the relationship between the displacement of the spring body α and the horizontal axis is the pressing force, and the vertical axis is the displacement. When a pressing force of Pr is applied to the finishing grindstone, the coil spring body α is L
The displacement of the coiled spring body I is Lf, and the machined surface Qυ protrudes by 1 from the machined surface (17) and is in good condition. It shows.

Next, regarding the operation, in the case of super finishing processing, the processing surface 1η, Qυ of the grindstone is pressed against the surface to be processed (4), and processing is performed by applying rotation or vibration. First, when a force Pr greater than Pr is applied to the grinding wheel, the internal machining surface αη, contacts the work surface (4) flush with the surface to be machined (4), and the finishing grinding wheel (7) contacts with the pressing force of Pr, and rough machining is performed. The grindstone αe comes into contact with the pressing force of Pr −Pr. When machining is started in this state and it reaches the time of finishing machining, if a pressing force smaller than Pr is applied, the machining WJa? ) is not in contact with the surface to be processed (4) and is processed only with the finishing grindstone, resulting in a good super-finished surface.

Note that the rigidity of the elastic member (coil spring) is not so much of a problem, and it is sufficient that the machining surface αη of the rough machining grindstone αQ is separated from the workpiece surface (4) during finishing machining, and the above value 1 is just a few! One time is enough to obtain 4 meters, and the wear and tear of the grindstone is appropriately balanced during rough machining and finish machining, and the above-mentioned action continues at all times.

〔Effect of the invention〕

As mentioned above, the present invention is a grindstone that integrates a rough processing grindstone and a finishing grindstone, so there is no need to replace the grindstone during processing, and the processing efficiency is much higher than before, and moreover, one device is sufficient. Moreover, since the finishing grindstone is attached via a spring, the roughing grindstone does not take part in the finishing process at all, so that a finished surface with extremely good rolling properties can be obtained.

In this embodiment, the case of super-finishing processing has been described, but the present invention is not limited to this and can be applied to general processing, and it goes without saying that either of the two grindstones may be provided on the inside. Furthermore, the elastic member may also be made of rubber or the like.

To give an example of a grindstone, if the surface roughness is 0.88, #300 is suitable as a roughing grindstone, and #1200 is suitable as a finishing grindstone.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view of a conventional grindstone, Fig. 11g2 is a cross-sectional front view of an embodiment of the present invention, Fig. 3 is a side view, and Fig. 4 is a cross-sectional front view of a conventional grindstone.
The figure is also a diagram explaining the operation. (4): Processed surface αυ: Base metal αe: Roughing grinding wheel aη, t2υ: Processing surface 0 barrel 2 elastic member cA: Finishing grinding wheel Agent Patent attorney Noriyuki Chika (and 1 other person) Japan 1 Senshoya Figure 2, 111 i S- Figure 14 - Figure 3

Claims (2)

[Claims] (1) A base metal, a rough machining grindstone that is attached to the base metal and has a machining surface that makes sliding contact with the workpiece surface, an elastic member that is attached to the base metal, and a rough-machining grindstone that is attached to the base metal and that is attached to the base metal through the elastic member. An abrasive machining tool comprising: a finishing grindstone which is attached and has a machining surface that can elastically protrude and retract toward the to-be-worked surface from the machining surface. (2) The abrasive processing tool according to claim 1, wherein the processing surface of the finishing grindstone is formed in an annular shape surrounding the processing surface of the rough processing grindstone.