JP3072366B2 - Manufacturing method of multi-blade grinding tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a multi-edge grinding tool used for ultra-precision machining, and more particularly to a method for manufacturing a multi-edge grinding tool used for ductile mode grinding.

[0002]

2. Description of the Related Art Ductile mode grinding is known as a method for ultra-precision processing of brittle materials. In order to perform this ductile mode grinding, the depth of cut hm of an abrasive grain is determined by the ductile brittle transition cut thickness dc of a work. Need to be smaller (hm <d
c). That is, it is necessary to make the height of the abrasive cutting edge of the diamond grindstone as a tool highly accurate. The dc value of a ceramic material is, for example, about 100 nm.
Therefore, conventionally, in order to obtain a grinding wheel that can be used for ductile mode grinding, the outer peripheral swing of the original grinding wheel is reduced by submicron by a processing type truing in which in-feed grinding is performed with a cup type metal bond diamond grinding wheel for truing (# 200). Abrasive truing that reduces the order of order, then removes the binder of the abrasive grains by electrolytic dressing, protrudes the abrasive grain cutting edge, and further wears the tip of the abrasive grain by relatively sliding the cast iron platen and the abrasive grain The height of the abrasive cutting edge was made uniform.

[0003]

However, when the grindstone is rotated to process the abrasive grains as in the above-described conventional method, the cutting edge height of each abrasive grain can be made uniform, but there is no abrasive flank. As a result, the contact area between the abrasive grains and the work increases. On the other hand, if you process the abrasive grains by fixing the whetstone,
A relief surface can be formed on the abrasive grains, and the contact area between the abrasive grains and the work can be reduced, but processing is difficult. Also,
Each abrasive grain on the normal of the grinding wheel axis processed by the conventional method has an abrasive grain ridge line a that comes into contact with the workpiece first and an abrasive grain ridge line b that comes into contact later.
Are formed, and the work and the ridge line are in contact at two points.
On the other hand, in order to make the cutting edge height of the abrasive grains uniform, it is necessary to measure the abrasive grain cutting edge height in advance, and at the time of this measurement, the above-mentioned a, b If there is a peak of the abrasive grain cutting edge height due to the two ridge lines, it becomes impossible to determine which of a and b is higher. Then, when a is machined and the cutting edge heights are aligned, no problem occurs when the height of b is lower than the height of a, but when the height of b is higher than the height of a, In this case, the height of the abrasive cutting edge becomes uneven. Therefore,
Performing ductile mode grinding using a grindstone manufactured by a conventional method requires a high-rigidity machine tool capable of coping with excessive normal resistance. In addition, at present, sufficient shape accuracy cannot be obtained by grinding with a conventional grindstone. The present invention has been proposed in view of the above, in order to realize ductile mode grinding with a general machine tool, a grinding wheel having a low cutting force with a uniform cutting edge height of the abrasive grains and a flank at the tip of the abrasive grains. It is a method of manufacturing a multi-blade grinding tool for the purpose of providing.

[0004]

In order to achieve the above object, an invention according to claim 1 is a method of manufacturing a multi-blade grinding tool for precision-working a brittle material by ductile mode grinding, comprising: of a uniform columnar grains, as well as radially arranged about the grinding wheel rotation axis parallel to little shifted abrasive central axis from the normal wheel spindle forward, the cutting edge in this state
A method for manufacturing a multi-blade grinding tool, characterized in that the height is made uniform so that the abrasive and the workpiece do not come into contact with each other at two places to form a flank at the tip of the abrasive. Further, in addition to the above, the invention described in claim 2 is characterized in that a tip end surface of each abrasive grain of the fixed grindstone has an abrasive grain flank surface rotating tool having a rotation center axis slightly inclined from a normal axis of the grindstone axis. A method for manufacturing a multi-blade grinding tool according to claim 1, wherein the processing is performed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of the present invention.
FIG. 2 is an explanatory diagram of a state of grinding a workpiece by a multi-blade grinding tool manufactured according to the present invention.

[0006] In the multi-blade grinding tool 1 according to the present invention, the abrasive grains 2
In order to make the cutting edge ridge line 21 parallel to the grinding wheel axis 3, that is, the rotation center axis of the multi-blade grinding tool 1, the columnar diamond abrasive grains 20 with good geometrical accuracy and uniform crystal directions are radially arranged. In the present invention, in order to prevent the abrasive flank 22 and the workpiece W from coming into contact with each other at two places, and to reduce the torsional force applied to the abrasive shaft 3, the abrasive central axis 4 is moved from the abrasive wheel normal 5. The diamond abrasive grains 20 are slightly shifted in parallel to the front of the rotation.

Next, the height H of the abrasive grain cutting edges is adjusted so that the abrasive grain cutting depth hm at which the ductile mode grinding is performed becomes uniform with a value smaller than the ductile brittle transition cutout thickness dc. That is,
A rotary tool 6 for machining the front surface of the abrasive grains 2 to be described below.
It is processed by appropriate means. At this time, in the present invention, the multi-blade grinding tool 1 which is a grindstone is fixed, processing is performed on the individual abrasive grains 2 by moving the processing tool, and the processing amount is adjusted. The height H of the abrasive cutting edge is made uniform.

The rotary tool 6 for machining the abrasive flank is, for example, a disk-shaped machining tool as shown in the schematic diagram of FIG. The flank 22 is formed. The rotary tool 6 is made of iron or the like and processes the abrasive grains 2 by sliding wear.

When the flank 22 is machined, the rotation center axis of the abrasive flank machining rotary tool 6 is slightly tilted from the axis normal of the multi-blade grinding tool 1 so that the tool movement amount on the order of μm is on the order of nm. It is possible to cut the tool into the abrasive flank 22.

Although the flank 22 is inclined in FIG. 3, the flank 22 may be machined in parallel as shown in FIGS. Even if the flank surfaces 22 are parallel, the abrasive grains 2 and the work W come into contact at one point, and the normal grinding resistance does not increase. Further, in FIG. 3, the abrasive grains 2 are processed before the binder 7 is removed, but the abrasive grains 2 may be processed after the binder 7 is removed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately implemented unless the configuration described in the claims is changed.

[0012]

In summary, the present invention provides a method of arranging abrasive grains having a uniform crystal direction radially around a grinding wheel axis and slightly shifting the center axis of the abrasive grains from the normal of the grinding wheel axis. This is a method of manufacturing a multi-blade grinding tool in which a workpiece does not come into contact at two places and a flank is formed at the tip of the abrasive grain. It has a flank and the cutting edge height of each abrasive grain is uniform. Accordingly, since the normal grinding resistance is small, ductile mode grinding can be performed even with an inexpensive general machine tool having low rigidity. In addition, if a machine tool having high rigidity is used, deeper cutting of the grindstone can be performed, so that more efficient processing can be performed. Further, since excessive normal grinding resistance is suppressed, various functions and effects, such as suppression of heat generation, suppression of processing deterioration, and improvement of the shape accuracy of the workpiece, are exhibited.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a multi-blade grinding tool according to the present invention.

FIG. 2 is an explanatory view of a state of grinding a workpiece by a multi-blade grinding tool manufactured according to the present invention.

FIG. 3 is a schematic perspective view of a rotary tool for machining an abrasive clearance surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-blade grinding tool 2 Abrasive grain 3 Grindstone axis 4 Abrasive grain center axis 5 Grindstone axis normal 6 Rotary tool for flank face machining 7 Binder 21 Cutting edge ridgeline 22 Flank

Continuation of the front page (56) References JP-A-11-99412 (JP, A) JP-A-9-183061 (JP, A) JP-A-7-195259 (JP, A) JP-A-7-156047 (JP) , A) Japanese Utility Model Showa 62-174862 (JP, U) Japanese Utility Model Showa 58-188163 (JP, U) Japanese Utility Model Hei 2-117826 (JP, U) Japanese Utility Model Showa 58-52031 (JP, Y2) 7-505579 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B24D 5/06 B24D 3/00

Claims (2)

(57) [Claims] 1. A method of manufacturing a multi-blade grinding tool for precision machining of a brittle material by ductile mode grinding, comprising: disposing columnar abrasive grains having uniform crystal directions radially around a grinding wheel rotation axis; Before the center axis of the abrasive grain from the wheel axis normal
Parallel to little shifted towards, by <br/> aligning a cutting height off in that state, and to form a relief surface in the abrasive tip as abrasive and the workpiece does not contact with two points A method for producing a multi-blade grinding tool, characterized in that: 2. A multi-blade grinding tool according to claim 1, wherein the tip surface of each abrasive grain of the fixed abrasive is processed by a rotary tool for abrasive flank machining having a rotation center axis slightly inclined from a normal of the abrasive wheel axis. Manufacturing method.