JP2504882Y2 - Contact member - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a contact member of a probe, and in particular, an outer diameter dimension of a workpiece (a member having a discontinuous surface such as a gear, spline, or key groove) being ground by a grinder or the like. The present invention relates to a contact member of a probe used when measuring, etc.

[0002]

2. Description of the Related Art When measuring the outer shape of a work piece formed in a cylindrical shape, a contact is provided on a gauge such as an outer shape measuring head, and the contact is arranged so as to sandwich the work piece. Contact the work piece. In this case, since the workpiece is rotating, the outer diameter dimension is measured, and the peak value is selected from the measured values to be used as the outer dimension of the workpiece.

In general, rod-shaped contacts and spherical contacts are used as the contacts.

[0004]

[Problems to be Solved by the Invention] However, since the rod-shaped contact is provided parallel to the axis of the probe,
When the workpiece contacts the workpiece while sandwiching the rod-shaped contacts, the rod-shaped contacts are not arranged in parallel with each other but are arranged in a substantially C-shape. Therefore, the stop accuracy of the hydraulic cylinder that positions the probe at a predetermined position affects the measured value, which causes a problem that the measured value varies. Further, since the rod-shaped contact is made of a superhard member, there is a problem that the contact portion with the workpiece is worn and the measurement variation becomes large.

On the other hand, since the contact portion of the spherical contact is formed into a spherical shape, the contact surface of the spherical contact with the workpiece is substantially parallel. Therefore, the stopping accuracy of the hydraulic cylinder does not influence the measured value. Moreover, since the contact portion of the spherical contact is formed of a diamond member, the contact portion is less likely to wear. Therefore, in the case of a spherical contact, the drawbacks of the rod-shaped contact described above can be covered.

However, the spherical contact has a problem in that, when a notch is formed in the workpiece, it falls into the notch and measurement cannot be continued. Further, it is possible to make the spherical contact larger so as not to fall into the notch of the work material, but there is a problem that the contact becomes expensive because a member made of diamond is used.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a contact member for a probe which is inexpensive, has high measurement accuracy and durability, and does not fall into the notch of the work material. To do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention abuts a contact member of a probe provided at the tip of a probe against the workpiece being machined to reduce the size of the workpiece. In the measuring device, the contact members of the pair of probes are spherical contacts in which a portion in contact with the workpiece is formed in a spherical shape, and a spherical contact integrated with the probe in which the spherical contacts are attached. A rod-shaped auxiliary contact which is provided adjacently and has a height lower than that of the spherical surface of the spherical contact, and the auxiliary contact is in contact with surfaces of both end portions of the cutout portion of the workpiece being processed. It prevents the spherical contact from falling into the notch.

[0009]

According to the present invention, the contact member of the probe is set to be lower than the spherical surface of the spherical contact, which is formed adjacent to the spherical contact, and the spherical contact in which the portion capable of contacting the workpiece is formed in the spherical shape. It is composed of a rod-shaped auxiliary contact that is formed. Therefore, the workpiece is measured with a spherical contact, and when the spherical contact is about to fall into the notch of the workpiece, a rod-shaped auxiliary contact is applied to the surface of the workpiece at the end of the notch. Contact. As a result, it is possible to prevent the spherical contact from falling into the notch of the workpiece.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A contact member of a probe according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a contact member 10 of a probe according to the present invention, and FIG. 2 shows an outer shape measuring head 12 to which the contact member 10 of the probe according to the present invention is attached. The outer shape measuring head 12 is equipped with probes 14, 14, and the contact member 10 of the probe is attached to the tips of the probes 14, 14. Senji 14,
14 is configured to move in directions opposite to each other, and the workpiece 16 is attached to the contact members 10, 10 of the probe.
With a pinch. The outer shape measuring head 12 is a hydraulic cylinder 1.
8, the hydraulic cylinder 18 is connected to the outer shape measuring head main body 22 via the holder 20. Therefore,
When the hydraulic cylinder 18 operates, the outer shape measuring head body 22
Moves left and right in FIG.

As shown in FIG. 1, the contact member 1 of the probe
0 has a cylindrical mounting portion 30, and the mounting portion 30
A spherical contact 32 is fixed to the center of the. The spherical portion of the spherical contact 32 is formed of a diamond member. Further, a rod-shaped contact 34 is fixed to the mounting portion 30 on the left side of the spherical contact 32. The rod-shaped contact 34 is made of a superhard material and has both ends tapered. The rod-shaped contact 34 is formed in the cutout portion (key groove) 16 of the work piece 16 described later.
It is set longer than the width of A. Further, the rod-shaped contact 34 is set lower than the spherical portion of the spherical contact 32. Therefore, the usual measurement of the workpiece 16 is performed by the spherical contacts 32.

Further, the spherical contact 3 of the mounting portion 30
A threaded portion 30A is formed on the surface opposite to the surface to which 2 and the rod-shaped contact 34 are fixed. Screw part 30
A is fitted in a hole (not shown) at the tip of the probe 14, and a nut 36 is screwed into the threaded portion 30A. Therefore, the probe 14 is clamped by the mounting portion 30 and the nut 36. As a result, the spherical contact 32 and the rod-shaped contact 34 are fixed to the tip of the probe 14.

A case of measuring the outer shape of a workpiece formed in a cylindrical shape by the contact member 10 of the probe according to the present invention having such a structure will be described with reference to FIG. First, the workpiece 16 rotating on the rotating grindstone 40.
And the spherical contacts 32, 32 are pressed against the opposite surfaces of the workpiece 16 being ground with a predetermined pressure. Next, when the notch (key groove) 16A of the rotating workpiece 16 is located in the upper spherical contact 32, the spherical contact 32 tries to fall into the key groove 16A. Each end of the rod-shaped contact 34 comes into contact with the workpiece 16 at both ends of 16A.

Therefore, the spherical contact 32 has the key groove 1
Go over the keyway 16A without falling into 6A. The spherical contact 32 comes into contact with the material 16 to be processed when it passes over the key groove 16A. As a result, the spherical contact 3
The measurement can be continued even when 2 is positioned in the key groove 16A. After that, with the spherical contact 32, the workpiece 1
An outer diameter dimension of 6 is measured. Then, the peak value is selected from the measured values and used as the outer dimension of the workpiece 16.

Since the rod-shaped contact 34 is made of a super hard material, the raw material is inexpensive and the work piece 1
6 can be easily processed to a size corresponding to the width of the key groove 16A without a special processing machine. Further, since the length of the cemented carbide member is not limited, the measurable width of the key groove 16A of the workpiece 16 is not limited to the cemented carbide member.

In the above embodiment, the work piece 16 has a key groove 16
Although the case where A is formed has been described, the present invention is not limited to this and can be applied to the case where the workpiece 16 is formed with gears, splines and the like.

In the above embodiment, the contact member 10 of the probe is used.
Although the description has been given of the case where the is attached to the outer shape measuring head 12, the present invention is not limited to this and may be attached to other measuring devices.

[0018]

As described above, according to the contact member of the probe according to the present invention, the workpiece is measured by the spherical contact, and the spherical contact attempts to fall into the notch of the workpiece. At this time, the rod-shaped auxiliary contact comes into contact with the surface of the work piece at the end of the notch. Therefore, it is possible to improve the measurement accuracy and durability at low cost and prevent the work material from falling into the notch.

[Brief description of drawings]

FIG. 1 is a perspective view of a contact member of a probe according to the present invention.

FIG. 2 is a side view of the outer shape measuring head to which the contact member of the probe according to the present invention is attached.

FIG. 3 is a side view for explaining a case of measuring the outer diameter dimension of a workpiece using the contact member of the probe according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Contact member of probe 12 ... External measuring head 14 ... Probe 16 ... Work material 16A ... Key groove 32 ... Spherical contact 34 ... Rod-like contact 40 ... Whetstone

Claims (1)

(57) [Scope of utility model registration request] 1. An apparatus for measuring a dimension of a workpiece by contacting a contact member of a probe provided at a tip of a probe with a workpiece being processed, wherein the contact member of the probe is the workpiece. a spherical contact contacting portion is formed in a spherical shape in wood, spherical co
Has an auxiliary contact Ntakuto height than spherical spherical contact provided adjacent to Hakako and and spherical contact integrally mounted is set lower bar-shaped, the said auxiliary contact, said during processing Of the notch of the work material
A contact member for a probe, which contacts the surfaces of both ends to prevent the spherical contact from falling into the notch.