JPS5947141A - Position detector of tool tip in machine tool - Google Patents

Abstract

PURPOSE:To form a tip position detector of tools for an NC lathe or the like in a very compact size further in constitution easily operated, by enabling three- dimensional position of a tool tip to be detected by an analog signal without any necessity for switching in the detector. CONSTITUTION:A detector, which detects and confirms a position of the point of a tool, is constituted by a square pillar 2 into the center of which an analog sensor 1 is inserted. While each part A, B, C, D of the square pillar 2 is connected to each ther by thin parts 8, 11, 12 formed at the ends of grooves 10, 9, 6. Further, the thin parts 8, 11, 12 are positioned at an equal distance l3 from respective contact points 3, 4, 5. On the other hand, an anvil 13 is fixed to the middle of the part A at the end of said square pillar 2. Next, the parts A and B and the parts B and C are respectively related by a stopper 16. By this constitution, the three-dimensional tip position of the tool can be detected by easy operation, and the detector can be constituted in a very compact size.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the position of a cutting edge of a tool of a machine tool. For example, in NC lathes, etc., in order to maintain and correct the relative position between the cutting edge and the machine body when the cutting edge wears out or the cutting tool is replaced, etc., the cutting edge is moved close to the rotation center line of the main shaft of the machine, as shown in Figure 1. It becomes necessary to detect and confirm the position of the tip of the cutting tool in the +Z and -Z directions parallel to the center line of one rotation in the X direction. Therefore, a detection device is required, but this device is required to be small so as not to interfere with the operation and operation of the machine, and to be easy to operate. However, in the conventional method, three contact sensors are installed separately at three locations, and the operating direction of the detector is switched depending on the detection direction, which makes the operation complicated and takes up a large amount of space. In the case of contact sensors, there were drawbacks such as the inability to obtain analog displacement signals before and after the contact. This invention is a very compact device that does not require switching and can detect positions in three directions using analog signals.

It is characterized by simple operation.

As shown in Figures 2.3 and 4.5, the detection device of the present invention consists of a square prism 2 into which an analog sensor 1 is inserted.
It consists of And X, +Z, -Z on the three sides of the tip.
A contact point of the cutting edge in the direction of 3°4.5 is provided. Then, a deep groove 6 with a narrow width is inserted from the opposite direction of the contact point 3 of Make it parallel to the outside surface. That is, when the cutting edge presses the contact point 3 from the X direction, the tip of the prism 2 rotates in the direction of the arrow 20 due to the curvature of the thin portion 8. And +Z in the same shape as this.

Insert grooves 10 and 9 in order from the opposite direction to the contact points 4 and 5 of 7, and use grooves 10 and 9.6 to connect the prism from the tip A to
Parts B, C, and D. And A.

The parts 13, C, 1) are interconnected by a thin section 12.11.8 made at the end of the groove 10, 9.6. Here, this device is used with part 1 fixed.

A displacement detector 1 is fixed to the right in the center of the D portion, and its detection tip 15 faces to the right. On the other hand, an anvil 13 is fixed at the center of the A section at the tip of the prism 2, and a contact "+14" is buried in the inner (leftward) tip of the anvil 13.The detection tip 15 is always in contact with the contact +14.

Here, 13.C part is the anvil 13. It is not in contact with any of the detectors 1. Note that three thin parts 8, 11.
12 are located equidistant l from the respective contact points 3, 4.5.

Here, the A part and the 13th part, and the B part and the C part are the 6th part.
Each is associated with a stop 16, 17 as shown. That is, the stopper 16 between A and 13 is inserted into a hole that has enough room for the A part and is fixed to the B part, so that the A part can approach the B part but cannot move away from it. This relationship is also the same for the stopper 17, whereby portion B can approach portion C, but cannot move away from it.

Therefore, in FIG. 6, when part A is pushed downward from the -1-Z direction at the contact point 4 by 1.'', part A slightly rotates in the clockwise direction of the arrow 18 due to the curvature of the thin portion 12. The tip 14 of the anvil 13 fixed to part A presses against the detection tip 15 of the detector 1. At this time, since part A is related to the stopper 16 with a margin, parts B and C are not affected. Next, when pressing upward in the -ZZ direction from the lower contact point 5 in Fig. 6, A
, the B part is pressed together by the head of Stotsuno (16),
In the N interior 11, the IS portion performs a slight rotation in the direction of the arrow 19. At this time, the portions A and 8B are also rotated together by being pushed by the stopper 16, and the detection tip 1 of the detector 1 is rotated in the same manner as described above.
Press 5 to increase the size.

Then, when contact point 3 is pressed from the X direction,
It will be pushed from just above the plane of the paper in FIG. 2, and the direction of the force is parallel to the thin-walled portions 11 and 12, so there is no relation to portions A and B, and the thin-walled portion 8 in FIG. Curve. Since the C part and the B part, and the B part and the A part are connected by the struts 17 and 16, respectively, the rotational movement of the C part becomes the rotational movement of the A part, and the contact 314 of the anvil 13 presses the detection light ☆1Ai151. .

Here, when comparing the amount of displacement of part A and the amount of displacement of detection tip 15 at x, +Z, and -Z, the detection magnification is 13 because the curved thin part is located at the same distance of 13 from the contact point. /A+ (however, el is 1/2 of the thickness of the prism 2
), and the detection magnification in the three directions is the same. In other words, when the detection tip of the detection unit takes a constant value, and if this is taken as the reference position of the cutting edge, the A part will have the same displacement no matter which direction the cutting edge is pressed against this detection device: X, +Z, -, or Z. It is possible to detect the point displaced by the amount, and the position of the cutting edge in three directions can be detected with a simple operation.

Note that when this device is installed so that the X direction coincides with the axial direction of the detector, the contact point of the cutting edge may be set at the end of the anvil 13 (the right end in FIG. 2) as shown in e.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a cutting edge position detection operation in a lathe as an example, FIG. 2 is a sectional view of the detection device of the present invention, FIG. 3 is a right side view of FIG. 2, and FIG. 4 is a front view, FIG. 5 is an explanatory diagram showing its outline, and FIG. 6 is an explanatory diagram of its functions. 1 Detector 2. Square prism 6.9.10 Load 8
．． 11.12. Thin wall part 137 Nobile Patent Applicant Co., Ltd. Tokyo Seimitsu No. 11 Zoll Figure 2 Figure 3 Figure 269- Whistle 6M1

Claims (1)

[Scope of Claims] A contact point where the cutting edge comes into contact with the tip of the three sides of the square prism is provided, and narrow grooves are sequentially made in three places in the square prism from the direction opposite to this contact point, and the tip portion is Make parts B, C, and D from A, fix the character 卯 in the middle of the ambience of part A, and attach a displacement detector whose detection tip touches the valve to part 1]. A thin-walled part is provided at the end of the groove at an equal distance (l,) from the contact point of the cutting edge, and a stopper is attached to the 13th part and the C part, and the A part is compared to the B part. A cutting edge position detection device for a machine tool configured to prevent part B from separating from part C.