JPH0330804Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a touch sensor used in an NC lathe to measure the position of a cutting edge of a tool mounted on a tool post.

Conventionally, as shown in FIG.
The position of the cutting edge of the tool 5 was measured by bringing it into contact with the cutting edge of the tool 5 mounted on the tool rest 4, but the cross-sectional shape of the probe 3 used was a square cross-section 3' as shown in FIG. 2A. The square measuring tip 3' is roughly divided into two types: the tool 3'' with a circular cross section as shown in FIG. It is used to measure the position of the cutting edge in the X direction and the cutting edge position in the Z direction, and the circular measuring tip 3'' is used to measure the position of the cutting edge in the X direction and the cutting edge in the Z direction.As shown in FIG. It is used to measure the position of the cutting edge in the Z direction of a cutting tool or thread cutting tool. When the measuring tip 3' having a square cross section as shown in FIG. The measurement is performed by applying the edge of the measuring element to the cutting edge of the tool 5'', which makes it impossible to form and maintain an ideal edge, resulting in poor measurement accuracy. The third
If used to measure the position of the cutting edge of a tool 5' having a radius at the tip as shown in the figure, the measurement would be made by applying the arc surface of the probe 3'' to the rounded part of the cutting edge, which would be impractical. Therefore, depending on the shape of the tool to be measured, it is necessary to replace the probe with a probe having a cross-sectional shape suitable for the tool, which is time-consuming and extremely inconvenient.

The present invention was proposed to solve the above problems, and the probe at the tip of the touch sensor that contacts the cutting edge of the tool to measure the cutting edge position is columnar with a cross-sectional shape that is a combination of a square and a circular shape. form, 1
The purpose of this is to enable accurate measurement of the cutting edge position of various tools using a single probe.

Provided on a support stand attached to a machine base opposite to a tool attached to a tool rest that moves relatively in the axial direction of the workpiece and in a radial direction orthogonal to the axial direction, the movement of the tool rest or the support stand is provided. A touch sensor for measuring a cutting edge in an NC lathe that outputs a touch signal when the cutting edge of the tool comes into contact with a gauge head, wherein the gauge head is connected to two plane parts parallel to the axial direction and two plane parts parallel to the radial direction. The measuring element has a rectangular shape formed by the plane part, and an arc part in which each intersection of the axial plane and the radial plane is arc-shaped, and the cutting edge of the tool is connected to the plane part. The above object has been achieved with the configuration of a touch sensor for measuring a cutting edge which is brought into contact with one of the circular arc parts and outputs a touch signal for determining the position of the cutting edge.

The present invention will be described below with reference to the drawings.

FIG. 5 shows a touch sensor 6 according to an embodiment of the present invention, and a measuring stylus 7 attached to the tip of the touch sensor 6 is composed of a combination of a square and a circle with each edge of the square shaped like an arc. It is formed into a columnar shape with a cross-sectional shape, and has a plane part 7a and an arcuate part 7b that are parallel to each other.

The flat portion 7a and the arcuate surface portion 7b are selectively used depending on the shape of the cutting edge of the tool to be measured. For example, when measuring the position of the cutting edge of a tool 5' with a radius on the cutting edge as shown in FIG.
When measuring the position of the cutting edge of a tool 5'' having a skewed blade, by contacting the arcuate surface part 7b and measuring, a single measuring element can be used without replacing the contact element. Appropriate measurements can be made according to the blade of each tool.

Figures 7A, 7B and 7C show other embodiments, in which arcuate surfaces 7b and 7b are located between two parallel planes 7a and 7a.
This is the measuring head 7 formed with the following.

As described above, the touch sensor for measuring the cutting edge of an NC lathe according to the present invention is formed into a columnar shape with a plane part and an arcuate surface part at the tip of the probe. By bringing either of them into contact, it is possible to properly measure the position of the cutting edge of the tool without replacing the probe. Therefore, it is possible to save time and effort in replacing the probe, improving the efficiency of measurement work while maintaining high accuracy, and eliminating damage to the probe that is likely to occur when replacing the probe.

[Brief explanation of the drawing]

Figure 1 is a front view showing how a conventional touch sensor for measuring a cutting edge is used, Figure 2 is a perspective view of a conventional probe, Figures 3 and 4 are a front view of a conventional touch sensor used in measurement. FIG. 5 is a perspective view of an embodiment of the touch sensor for measuring the cutting edge according to the present invention, and FIG.
FIG. 7 is a front view of the state in which the probe tip is in use, and FIG. 7 is a front view of another embodiment. 1...Movable base, 2, 6...Touch sensor, 3,
3', 3''...Measuring head, 4...Turret, 5,5',
5″...Tool, 7a...Plane part, 7b...Circular surface part.

Claims (1)

[Claims for Utility Model Registration] The tool is provided on a support stand attached to the machine base opposite to a tool attached to a tool rest that moves relatively in the axial direction of the workpiece and in the radial direction orthogonal to the axial direction, and A touch sensor for measuring a cutting edge in an NC lathe that outputs a touch signal when the cutting edge of the tool comes into contact with a gauge head due to movement of the tool rest or the support base, wherein the gauge head is connected to two flat surfaces parallel to the axial direction. and two plane parts parallel to the radial direction to form a rectangle, and each intersection of the axial plane and the radial plane has an arc shape. The NC is characterized in that the cutting edge of the tool is brought into contact with either the flat portion or the circular arc portion and a touch signal for determining the cutting edge position is output.
Touch sensor for measuring cutting edge on lathes.