JPH0128963Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a tool rest for a metal working tool. Conventionally, in order to make a depth of cut, the entire fixed tool post is moved by moving the slide, and the position of the cutting edge is changed to determine the dimensions of the workpiece. It is designed to adjust the position and place the cutting edge in a fixed position. Recently, there has been a strong demand to add automatic tool wear compensation devices to machines in order to further limit dimensional changes due to tool wear, and these devices are already in practical use. In particular, in numerically controlled machine tools that are equipped with multiple spindles and have their own turrets on a single slide for each spindle, there are differences in the wear of the tools carried by each turret, so a tool wear compensation function is required. Even if the blade is used, it is not possible to correct the multiple cutting edges to the correct position. Therefore, it is necessary to slightly adjust the position of the cutting edge of one turret relative to the other turret. Using an ultra-precision lathe, we can obtain the same dimensional accuracy as machining with a grinder, and even when machining mirror surface roughness (practical only for light metals), we can move the cutting tool in steps of 0.001 to 0.01 mm. There is a request to do so.

The amount of movement of the cutting edge by an automatic tool wear compensation device or a tool rest in an ultra-precision lathe needs to be smaller and more accurate than conventionally thought. On the other hand, in order to generalize automatic tool wear compensation or micro-cutting in ultra-precision turning, there is a demand for the tool rest to be in an absolute position and only the cutting edge to be moved slightly with respect to the tool rest. There are the following difficulties in meeting this request.

First, in order for the tool rest to support a blade that can withstand cutting forces, the blade must be strongly clamped after fine adjustment. However, when the cutting edge is positioned at a regular angle and then clamped, the position of the cutting edge changes due to the gap in the adjusting device for the cutting edge and the relative distortion within the tool rest caused by the clamping force. In order to withstand cutting with the blade edge position adjusted without clamping, the mechanism that adjusts the tiny blade edge of the tool rest must be made extremely precisely and without any gaps, but in reality, fine adjustments can be made to adjust the blade edge movement. A large amount of force is required, and the output, that is, the cutting edge, does not move accurately due to elasticity and Coulomb friction in response to the input to move.

The invention disclosed in Japanese Patent Application Laid-Open No. 154892/1989 as a response to such demands for conventional tool rests provides an elastic part between the fine movement part and the fixed part to which the cutter is fixed, but cantilever support is provided. Therefore, it is not compatible with providing load capacity and making it easy to displace, and the vibration conditions due to instability are not good, and because the fine movement part is moved by a hydraulic mechanism, it is necessary to keep the cutting edge position constant. Difficult due to changes in pressure and oil temperature. The idea disclosed in Japanese Utility Model Publication No. 57-46102 overcomes the deficiencies in the fine adjustment tool rest of the prior art and exhibits excellent performance, but has the drawback of high manufacturing costs.

The object of this invention is to solve the problems of the prior art described above and provide a stable and inexpensive fine-adjustment tool rest in which the cutting edge moves accurately in accordance with the amount of input displacement.

This idea includes a movable part in the middle between parallel mounting parts that are spaced apart, and makes the turret main body integrally so that the mounting part and both ends of the movable part are connected by a spring part.
The mounting part of the cutting tool is provided on the movable part so that the rake face of the cutting edge faces in the direction connecting the mounting parts, a fine movement device is provided to press the rear part of the movable part, and both mounting parts are rigidly attached to the member that supports the tool post. It is a fixed fine-adjustment turret.

This will be explained below with reference to the drawings. The drawing shows an embodiment for turning. FIG. 1 is a side view including a partial sectional view of this tool rest, FIG. 2 is a front view thereof, and FIG. 3 is a plan view thereof.

The turret main body 1 has a hexagonal shape as a whole,
The upper and lower sides are separated and form the mounting part 2.
The positioning pin 4 comes into contact with the slide 3 of the machine tool, passes through the mounting part 2, and is driven into the slide 3,
A bolt 5 inserted through a bolt hole in a mounting portion of the main body 1 is screwed into the slide 3 and attached to the slide 3.

A gap 6 is provided between the side surface of the main body 1 facing the slide 3 other than the mounting portion 2 and the slide 3.
As a preferable position, the movable part 7 is provided at a center position that bisects the upper and lower mounting parts 2 of the main body 1, and the part connecting the movable part 7 and the mounting part 2 at both front and rear ends is a spring part 8. . A portion surrounded by the mounting portion 2, the movable portion 7, and the spring portion 8 is an opening 10 passing through it. The main body 1 includes a mounting portion 2, a movable portion 7, and a spring portion 8 that are integrally formed.

The spring portion 8 has a flat plate shape with both front and rear sides parallel to each other. In the movable part 7, a groove 11 into which the handle of the cutting tool 9 is inserted is provided on the side facing the slide 3 and the opposite side so as to stop from the right front side in FIG. 9 is tightened by a tightening screw 12 screwed into the movable part 7 from an upper opening 10, and the lower surface of the cutting tool 9 is pressed against the lower surface of the groove 11 in FIG. A tightening screw 13 parallel to the tightening screw 12 has a conical tip that presses against an inclined surface 14 at the rear end of the cutting tool 9 so that the position of the cutting edge of the cutting tool 9 can be adjusted. Of course, in the case of a reverse cutting tool, the rake face of the cutting edge faces downward in FIG. 1, and the entire tool is upside down.

A set screw 15 is disposed at the rear end of the movable part 7 so as to preferably align with a horizontal line passing through the cutting edge of the cutting tool 9 (the figure is slightly offset). The push screw 15 is horizontally slidably fitted into the differential screw body 16 via a key 17 fixed to the push screw 15 which slides through a keyway provided in the differential screw body 16. Numeral 18 is a sealing ring fitted into the differential screw main body 16 to seal the shaft of the push screw 15.

The differential screw body 16 contacts the slide 3 and is positioned by a positioning pin 19 that is driven into the slide 3 through the differential screw body 16, and is inserted into the slide 3 by passing through the bolt hole of the differential screw body 16. It is fixed to the slide 3 by screwed bolts 21.

The rear end of the push screw 15 has a male thread, and the female thread of the operating screw member 22 is screwed into this male thread to form a screw pair 23, and the portion of the operating screw member 22 with the female thread of the screw pair 23 is cylindrical. The male screw provided on the outer periphery is the differential screw main body 16.
It is screwed into a female screw provided in a hole at the rear of the screw, thereby forming a screw pair 24. The screw pairs 23 and 24 each have the same twisting pattern and have a minute pitch difference, forming a differential screw.

A collar portion 25 integrally formed at the rear end of the differential screw body 16 and the end of a cylindrical portion projecting to the outside at the rear end of the operating screw member 22 form a microrota scale.

When the operating screw member 22 is rotated, the operating screw member 22 is moved back and forth with respect to the differential screw main body 16 by the screw pair 24. At the same time, the screw pair 23 causes the push screw 15 to move relative to the operation screw member 22 in a direction opposite to the moving direction of the operation screw member 22, and the push screw 15 moves in and out depending on the pitch difference between the screw pairs 23 and 24. The push screw 15 constantly presses the movable part 7 so that the spring part 8 is bent within the position adjustment range of the cutting tool 9. As the push screw 15 moves, the movable part 7 moves, and the cutting edge position of the cutting tool 9 is set by the push screw. 15
It is displaced by the amount of movement in and out. When moving the movable part 7,
The spring part 8 has both ends fixed to the mounting part 2, and the movable part 7
It can be approximately modeled as acting as a beam with both ends fixed to which a concentrated load is applied, but the important action here is that the spring part 8 acts as an elastic body like a tension wire with both ends fixed to the mounting part 2. It is the point where force is received. Therefore, when the movable part 7 is displaced by a certain amount or more by the push screw 15, the stress of the spring part 8 becomes only a tensile force, and the movable part 7 is not opposed by bending stress, so that stability is high. That is, even when the cutting tool 9 moves in the cutting direction, ie, when it is biting, the supporting force that resists the force is large. The main component of the cutting force acting on the cutting tool 9 is the main component of the cutting force because the upper spring part 8 on the front side has already received a tensile force, and the lower spring part on the front side has received a tensile force like a preload. It is possible to sufficiently maintain the carrying capacity. In other words, both ends are fixedly supported by the mounting part 2, and the movable part 7 in the center is displaceable. It has the ability to carry force and has great dynamic stability. The back force of the cutting force is generated by the movable part 7.
It is carried by a push screw 15 of a fine movement device which pushes the rear end of the .

As described above, this invention has mounting parts separated vertically, a movable part in the center to which the cutting tool is attached so that the rake surface of the cutting edge faces upward or downward, and a spring part that connects the movable part and the mounting part in the front and back. Since these are integrated into a tool post main body and the movable part is moved by a fine movement device, when the cutting tool 9 is displaced, there is no friction part in the tool post main body and the cutting edge is accurately displaced. is accurate in one direction in the cutting direction.The spring part is fixed to the mounting parts on both sides and is pushed in the center, so there is dynamic stability.
It also has the ability to carry cutting force. The configuration is simple and inexpensive. When a differential screw device is used as a fine adjustment device for a movable part, the fine adjustment device is simple and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a side view of an embodiment of this invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a plan view of FIG. 1. 1... Turret body, 2... Mounting part, 3... Slide, 4... Positioning pin, 5... Bolt, 6...
...Gap, 7...Movable part, 8...Spring part, 9...Bite, 10...Opening, 11...Groove, 12, 13...
... Tightening screw, 14 ... Inclined surface, 15 ... Push screw, 16 ... Differential screw body, 17 ... Key, 18
... Sealing ring, 19 ... Positioning pin, 21 ... Bolt, 22 ... Operating screw member, 23, 24 ... Screw pair, 25 ... Collar portion.

Claims (1)

[Scope of utility model registration request] A movable part is provided in the middle between the parallel mounting parts that are spaced apart, and the turret main body is made integrally so that both ends of the mounting part and the movable part are connected by a spring part, and the rake surface of the cutting edge is attached to the movable part at the mounting part. A fine-adjustment tool rest in which a mounting part for a cutting tool is provided so as to face in the direction connecting the gap, a fine movement device is provided to press the rear part of the movable part, and both mounting parts are rigidly fixed to a member that supports the tool post.