JPS63283810A - Hybrid tool for cutting and grinding - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a machining tool, and more particularly to a cutting-grinding hybrid tool that can simultaneously perform cutting and grinding with one tool.

[Prior Art] Conventionally, finishing processing of hardened steel materials has been mainly carried out by grinding using a surface grinder or the like. Grinding involves rotating a grinding wheel at high speed, and using the many abrasive cutting edges on the working surface of the grinding wheel, microscopic chips are removed from the workpiece to create a product with the desired shape, dimensions, and finished surface quality. However, due to the low chip removal rate, it takes a long time and cannot be said to be a highly productive process.

On the other hand, tool development has progressed in recent years, and CBN tools and the like have come to be used for face milling.

CBN is cubic boron nitride.
It has the same crystal structure as diamond, has a hardness second only to diamond, and is a tool material that can be compared to diamond. In particular, CBN
It is more stable than diamond against heat and more inert than diamond when it comes to iron, making it suitable for machining hardened special steels. However, CBN
Face milling using a tool is more efficient than grinding, but it is inferior to grinding in terms of accuracy. Therefore, the current situation is that finishing of hardened steel has no choice but to involve low-productivity grinding.

[Problems to be Solved by the Invention] The present invention was made in view of the above-mentioned problems in finishing hardened steel, and combines the advantages of cutting tools and grinding tools to achieve high productivity and high precision. The purpose is to provide a tool that can process.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the inventor of the present invention has conducted intensive research on performing high-efficiency cutting and high-precision grinding at the same time, and has developed a cutting-grinding hybrid tool. The invention has been completed, and the cutting/grinding/grinding hybrid tool of the present invention has a single-point cutting tool fixed to the outer periphery of a circular cutting tool support member, and has a diameter larger than the cutting tool support member at the center of the cutting tool support member. A small cup-shaped grinding tool support member is attached so that it can be moved up and down, and a grinding wheel is fixed to the cup-shaped grinding tool support member so as to protrude from the end face of the cutting tool.

[Operation] First, the rigid material is cut with a relatively large cutting allowance by a single point cutting tool fixed to the outer periphery of the cutting tool support member. A cup-shaped grinding tool support part with a smaller diameter than the cutting tool support member is attached to the center of the cutting tool support member so that it can be moved up and down. Since the grinding wheel is fixed, the protruding portion of the grinding wheel becomes a grinding allowance, and the cut surface cut by the single point cutting tool is finished by grinding.

[Examples] Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway front view of an embodiment of the present invention, and FIG. 2 is a bottom view of the embodiment of FIG.

The tool consists of an arbor part 1, a grinding wheel 2, a cutting tool 3, and an air turbine 4 for rotating the grinding wheel. The arbor part 1 has a national taper and is held by a machine (not shown) by pulling a pull stud 5.

The air turbine 4 for rotating the grinding wheel can be moved downward by supplying oil to an upper cylinder chamber 6 built in the arbor 1, and upward by supplying oil to a lower cylinder chamber 7.

The air turbine 4 for rotating the grinding wheel rotates by supplying air to the turbine section 8, and is equipped with an air bearing so that it can handle high rotations. Note that 9 is a bearing in the radial direction, and 10 is a bearing in the thrust direction.

The cutting tool 3 is a single point cutting edge tool, and is held by tightening a wedge 23 with a lock bolt 22 around the lower end outer periphery of the arbor 1, which is a cutting tool support member, and is rotated by rotation on the machine side.

The grinding wheel 2 has a smaller diameter than the arbor 1;
It is fitted into a circular space formed on the lower surface of the grinding wheel, and is held by a nut 20 on a turbine spindle 19 of an air turbine 4 for rotating a grinding wheel, which is a grinding tool support member, and is rotated by the high speed rotation of the air turbine 4.

Cutting oil is supplied from a cutting oil supply port 11 inside the grinding wheel 2, and air discharged from the turbine section 8, bearing sections 9 and 10 is discharged from an air discharge port 12 to prevent the grinding oil from scattering to the outside. The oil is supplied to the cylinder parts 6 and 7 of 0 and above through joints 13 and 14.
Therefore, the joint 15 is connected to the turbine section 8, and the joints 16 and 17 are connected to the bearing sections 9 and 10, and the joints are held stationary via a bearing 18. 23 is an oil seal.

Processing of a rigid material using the tool of this embodiment having the above configuration will be explained based on a side view of FIG. 3 showing a state in which the rigid material is being processed and a plan view of FIG. 4. In FIG. 3, the cutting depth b of the cutting tool 3 into the workpiece 30 is
The depth of cut 1 by zero-order grinding, which is a high depth of cut in consideration of high cutting efficiency, is determined by the amount by which the grinding wheel 2 protrudes from the lower end of the cutting tool 2. The depth of cut is adjusted by supplying oil.

The machine is rotated to rotate the cutting tool 3, and at the same time, the air turbine 4 is rotated to rotate the grinding wheel 2 fixed to the turbine spindle 19. When the tool is sent in the direction of the arrow,
(2) The machined surface C is subjected to high-depth cutting by the cutting tool 2 to become a cut surface B, and then ground by the grinding wheel 2 to become a grindstone-finished surface A. At this time, the feed rate of the tool is restricted by either the cutting tool 3 or the grinding wheel 2, but the cutting speed or grinding speed is controlled by the rotation of the machine or the air turbine 4, respectively.

[Effects of the Invention] As described in detail above, in the cutting and grinding hybrid tool of the present invention, a single point cutting tool is arranged on the outer periphery of the cutting tool support member, and the cutting tool support member is provided in the space at the center of the lower surface of the cutting tool support member. A grinding tool support member having a smaller diameter is attached to the grinding tool support member so that it can be moved up and down, and a grinding wheel is fixed to the grinding tool support member so as to protrude from the lower end surface of the cutting tool. The cutting tool attached to the outer periphery of the cutting tool support member performs cutting with a high depth of cut, and at the same time, the grinding wheel located inside the cutting tool and protruding from the lower end of the cutting tool performs the grinding process, resulting in high efficiency. It has the excellent effect of being able to perform large, high-precision machining.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an embodiment of the present invention, Fig. 2 is a bottom view of the embodiment of Fig. 1, and Fig. 3 shows a workpiece material being machined using the tool of the present invention. FIG. 4 is a plan view of FIG. 3. DESCRIPTION OF SYMBOLS 1... Arbor part, 2... Grinding wheel, 3... Cutting tool, 4... Air turbine for rotating the grinding wheel, 6...
- Cylinder upper chamber, 7... Cylinder lower chamber, 8... Turbine section, 19... Turbine spindle, 30... Work material. Figure 1 Figure 20

Claims (1)

[Claims] (1) A single-point cutting tool is fixed to the outer periphery of a circular cutting tool support member, and a cup-shaped grinding tool support member with a smaller diameter than the cutting tool support member is placed in the center of the cutting tool support member and can be moved up and down and adjusted. A cutting and grinding hybrid tool, characterized in that a grinding wheel is fixed to the cup-shaped grinding tool support member so as to protrude from an end surface of the cutting tool.