JPH0431539Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Industrial technical field The present invention is a step position measuring device that is installed in the tool rest of a machine tool and is suitable for quickly and accurately measuring the step position of a workpiece. Regarding.

(2) Conventional technology In NC lathes, etc., a chuck is provided on the rotatable main shaft on the headstock side, the chuck grips the workpiece, and a tool rest disposed at the opposite position holds the required tool. Machining is performed by controlling the movement of the tool rest and tool.

The measurement surface of a workpiece whose inner diameter has been cut by the above method, for example, _a stepped _portion of the workpiece W as shown in FIG. When measuring the step dimension 1 in the axial direction from the turret side end face to the turret side end face, conventionally, the plug gauge T is inserted into the workpiece W as shown in Fig. 7B, and one end face of the plug gauge T is placed on the measurement surface. Measure the dimensional difference S between the other end surface of the plug gauge T and the end surface of the workpiece W, and calculate the step dimension 1 in the axial direction from the difference value from the reference length L of the plug gauge T. I was looking for it.

Furthermore, recently, automatic measuring devices have been used for measurements.

(3) Problems to be solved The conventional method of measuring using a plug gauge has the problem of being inefficient and having poor measurement accuracy because it is done manually.

In addition, the automatic measuring devices that have been developed so far have been able to accurately position the contact at the step position and then
There was a problem in that the measurement had to be performed and it took a considerable amount of time.

(4) Purpose The purpose of this invention was proposed to solve the above-mentioned problems, and it is possible to perform quick and accurate measurements, to perform automatic measurements, and to be simple and lightweight. An object of the present invention is to provide a level difference position measuring device.

(5) Means for Solving the Problems In order to achieve the above object, the present invention holds the measuring device in a fixed part such as a turret of a numerically controlled NC lathe. a first measurement surface formed on the object to be measured;
A step position measuring device for measuring a step position between the first measurement surface and a second measurement surface formed parallel to the first measurement surface and spaced apart by a predetermined dimension, a measuring device main body provided so as to be relatively movable in a first direction parallel to the first measurement surface and the second datum plane and in a step direction perpendicular to the first direction; a slider provided to be slidable in the step direction; a support shaft fixed to the slider in the first direction and a direction orthogonal to the step direction;
a support member extending in the step direction and swingably provided around the support shaft; one end side fixed to the support member, and the other end side having the first measurement surface and the second measurement surface. A measuring element having a flat surface that can be positioned parallel to the first direction in order to come into contact with the object is provided, and is provided between the rod extending toward the object to be measured, the slider, and the supporting member. a first biasing means that is provided and that constantly biases the rod fixed to the support member in the first direction;
a second biasing means provided between the measuring device main body and the slider and constantly biasing the slider toward the measuring tip with respect to the measuring device main body; and a second biasing means provided in the measuring device main body, a touch switch that comes into contact with the support member to detect the moving position of the measuring stylus in the step direction, and moves the measuring device main body relative to the object to be measured, and moves the measuring stylus to measure the object. Configuration of a step position measuring device that measures a step position of the second measurement surface with respect to the first measurement surface by bringing the contact point into contact with a surface so that the plane of the contact point is parallel to the first direction. And so.

(6) Effect The step position measuring device of the present invention is inserted into a tool rest of a numerically controlled NC lathe or the like via a holder. Then, the main body of the measuring device is moved in the X-axis direction and the Z-axis direction, and the measuring head attached to the tip of the rod is brought into contact with the first measuring surface and the second measuring surface within the workpiece. Therefore, the measurement surface is 0.5 to 1 mm.
Even in the case of a step portion having a size of about 100 yen, the step size can be measured quickly and accurately. Moreover, automatic measurement is also possible because the NC device controls the axis movement and reads the position when the signal is input from the touch switch and calculates the step size.

(7) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is an axial cross-sectional view of the step position measuring device of the present invention.

In FIG. 1, a rod 2 (hereinafter referred to as a probe), which is the main part of the measuring device 1, is formed into an elongated shape, and one end of the rod 2 is inserted into the front support member 3a of the support member 3 with a male thread of a screw 2a. A measuring element 4 having a substantially semicircular spherical shape is removably screwed onto the other end. The measurement surface of the probe 4 is provided with a flat portion, which will be described later, which is formed so as to come into contact with a first measurement surface and a second measurement surface of the object to be measured (workpiece). The support member 3 that supports the probe 2 is formed from a front support member 3a and a rear support member 3b. Rear support member 3
b is fitted into the inner surface of the slider 5, and the pin 6, which is the support shaft of the support member 3, is fitted into the rear support member 3b as shown in FIG. ing. Therefore, the probe 2 supported by the support member 3 swings up and down using the pin 6 as a fulcrum.

The outer periphery of the slider 5 is slidably supported within the hole of the sleeve 9. A holder 10 for attachment to the tool rest is fitted around the outer periphery of the sleeve 9.

A cover 11 is screwed onto the open end of the sleeve 9 on the probe side with a screw 13 through an O-ring 12, and a cover 14 is screwed onto the open end of the sleeve 9 on the opposite side from the cover 11 through an O-ring 15. screw 1
It is screwed on with 6. The screw portion 17a of the touch switch 17 is attached to the nut 18,1 on the inner surface of the cover 14.
It is screwed on with 9.

A spring 20 serving as a second biasing means for biasing the slider 5 toward the probe 2 is interposed between the slider 5 and the cover 14 . Further, a dust cover 21 is provided between the cover 11 and the front support member 3a to prevent dust from entering into the sleeve 9 from the probe 2 side.

The touch switch 17 includes a contactor 17 that can come into contact with the rear end 3c of the rear support member 3b of the support member 3.
(b) It is formed from the above-mentioned threaded portion 17a and an operating portion (not shown), and is arranged so that its position can be adjusted in the axial direction of the probe 2 by the threaded portion 17a. The touch switch 17 is formed of a high-precision ON-OFF switch, and is configured to operate when the contactor 17b comes into contact with the rear end 3c of the rear support member 3b and a certain pressure is applied to the above operating part. There is. An electric wire from the touch switch 17 is connected to a control device (not shown).

When the slider 5 slides rearward, the rear end 3c of the rear support portion 3b comes into contact with the contactor 17b.
It has an arcuate shape so that it always contacts the contactor 17b in a constant positional relationship even when it swings up and down using the fulcrum as the fulcrum.

Before the probe 2 supported by the support member 3 measures the workpiece, it is always biased forward and downward. That is, a hole 2 is formed in the slider 5 in a direction perpendicular to the axial direction of the probe 2.
3, 24 Furthermore, a hole 25 is bored in the rear support member 3b that corresponds to the holes 23, 24, the holes 23, 24, and 25 are made to communicate with each other, and the spring 22, which is the first biasing means, is fitted and the screw is inserted through the hole 24. 27a, and by using the force of the spring 22, it is set in a state where it is always biased forward and downward in FIG. 27
b is a plug screw.

A stopper 28 is fixed near the rear end 3c of the rear support member 3b to keep the probe 2 in an appropriate forward and downward biasing position. Further, it is convenient to configure the stopper 28 so that it can be adjusted up and down.

FIG. 3 shows that the measuring device 1 moves in the X-axis direction and the Z-axis direction, and the measuring stylus 4 of the measuring device 1 comes into contact with the cut step (second measurement surface) of the workpiece W. In this figure, the probe 2 swings upward about the pin 6 as a fulcrum and assumes a parallel position, and the stopper 28 is out of contact with the slider 5. In this state, the axial position length l at the stepped portion (second measurement surface) of the workpiece W is measured.

Figure 4 shows the step part of the workpiece W (second measurement surface)
2 is an enlarged view showing the measuring element 4 of the measuring device 1 in contact with the semicircular plane part 4a of the measuring element 4 in contact with the stepped part (second measuring surface) of the workpiece W. It will be done. A plane part 4b having a predetermined angle with respect to the plane part 4a is formed on the opposite side of the plane part 4a, and as shown in FIG. When measuring, it is designed so that sufficient measurement can be made even when the force is biased forward and downward.

Next, the operation of the measuring device 1 will be explained using FIG. 6.

In FIG. 6, A moves the measuring device 1 installed in a tool post (not shown) in the X-axis direction, and points the center 4c of the measuring head 4 attached to the tip of the probe 2 onto the workpiece. the center of the measurement hole W-a. In this case, the measuring tip 4, which is the tip of the probe 2 of the measuring device 1, holds the pin 6 by the spring 22 built into the front support member 3a of the support member 3, as shown in FIG. It is biased forward and downward at an angle of θ with respect to the fulcrum.

From the state shown in A, move the measuring device 1 in the axial direction (step direction), that is, to the left in the Z-axis direction, insert it into the hole of the workpiece W, and stop it before the step (second measurement surface). , the state is B. In state B, move the measuring device 1 further in the radial direction (the first direction parallel to the measurement surface), that is, downward in the X-axis direction, and bring the probe 4 into contact with the inner surface of the hole, resulting in state C. . In the state C, the probe 2 supported by the support member 3 with the pin 6 as a fulcrum is swung upward by the action of the spring 22 and becomes substantially parallel to the axis W-a of the hole in the workpiece.

Furthermore, from state C, move this measuring device body to Z.
Move it to the left in the axial direction and check the stepped part (second measurement surface).
It will be in a state of 2 when it hits.

When the measuring device 1 is further moved a certain amount to the left in the axial direction, that is, the Z-axis direction, the slider 5 slides on the inner surface of the sleeve 9, and the rear end portion 3c of the rear support member 3b is moved. The contact 17b of the touch switch 17 is contacted, and the touch switch 17 outputs a touch signal. This signal is taken as a skip signal into the NC device, and the position of the measuring device 1 is read at the same time as the movement of the measuring device 1 is stopped.

From the value of this reading position in the Z-axis direction, the Z value when the touch signal is output when the end face part (first measurement surface) is brought into contact with the flat part 4b shown in FIG. 5 is determined.
The difference value obtained by subtracting the value of the axial position becomes the step size l, and the step size can be accurately measured.

By repeating the above operation for successive workpieces W, the position length of the stepped portion (second measurement surface) of one lot can be automatically and continuously measured rapidly.

(8) Effects of the invention As is clear from the above explanation, the measuring device of the invention can quickly and accurately measure the position even on a measurement surface with a small step of about 0.5 to 1 mm. , automatic measurement is possible, and it can be formed easily and lightweight. This in turn improves work efficiency. It is also possible to measure the position of the end surface (first measurement surface) of the object to be measured.

[Brief explanation of the drawing]

FIG. 1 is an axial sectional view of the level difference position measuring device of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. FIG. 3 is an axial sectional view of the step position measuring device of the present invention moved in the X-axis direction and the Z-axis direction and in contact with the step portion (second measurement surface) of the workpiece W. FIG. 4 shows an enlarged cross-sectional view of the step position measuring device of the present invention in which the probe is in contact with the step (second measurement surface) of the workpiece W, and FIG. 5 shows the step position measuring device of the present invention. The measuring tip is located at the end surface of the workpiece W (the first
FIG. 6th
The figure is an explanatory view showing the operating state of the measuring device 1 for measuring the position length of the stepped portion (second measurement surface) of the workpiece W. FIG. 7 is an explanatory diagram for measuring a conventional stepped portion of an object to be measured (second measurement surface). DESCRIPTION OF SYMBOLS 1... Main measuring device, 2... Probe, 3... Support member, 3a... Front support member, 3b... Rear support member, 3c... Rear end of rear support member, 4...
Measuring element, 5...Slider, 6...Pin, 9...Sleeve, 17...Touch switch, 17b...Contact element, 22...Spring, 28...Stopper, W...Workpiece.

Claims (1)

[Claims for Utility Model Registration] A first measurement surface formed on an object to be measured, and a second measurement surface formed parallel to the first measurement surface and spaced apart by a predetermined dimension. A step position measuring device for measuring the step position of the object, the device comprising: a first direction parallel to a first measurement surface and a second measurement surface of the object to be measured; and a first direction perpendicular to the first direction. a measuring device main body provided so as to be relatively movable in the step direction, a slider provided on the measuring device main body so as to be slidable in the step direction, and a slider provided in the first direction and in a direction orthogonal to the step direction. a support shaft fixed to the slider; a support member provided within the slider so as to extend in the step direction and swing freely about the support shaft; one end side fixed to the support member, and the other end side fixed to the support member; A measuring element is provided with a flat surface that can be positioned parallel to the first direction in order to abut the first measuring surface and the second measuring surface, and extends toward the object to be measured. a rod; a first biasing means provided between the slider and the support member and constantly biasing the rod fixed to the support member in the first direction; the measuring device main body and the slider; a second biasing means provided between the measuring device main body and constantly biasing the slider toward the measuring tip side with respect to the measuring device main body; It consists of a touch switch that detects the moving position of the measuring stylus in the step direction, and moves the measuring device main body relative to the object to be measured, brings the measuring stylus into contact with the measurement surface of the object, and performs the measurement. A step position measuring device characterized in that the step position of the second measurement surface relative to the first measurement surface is measured with a child plane parallel to the first direction.