JPH06106476A - Contact detecting device - Google Patents

Abstract

PURPOSE:To provide a contact detecting device by which contact detecting accuracy can be improved by removing a disturbance phenomenon of a false AE wave caused by coolant contact generated when a rotary body comes into contact with an AE detecting pin and detects the contact by the AE detecting pin. CONSTITUTION:At least the tip is formed in a pipe shape, and a detecting pin 20 with which a rotary body 1 comes into contact, is held on a fixed surface through a bracket 5, and an AE sensor 3 is connected to the rear end of this detecting pin 20 in a vibration propagating condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact detecting device used in a machine tool to detect a time point when a rotating body is contacted.

[0002]

2. Description of the Related Art In a truing device for a grindstone in a grinder or the like, an AE that occurs when a detection pin contacts the grindstone.
Contact detection is performed by detecting the (acoustic emission) signal.

As shown in FIGS. 3 and 4, a conventional contact detecting device has a bracket 5 bent in a crank shape on a headstock 4.
Insert the solid shaft detection pin 2 into the split groove 6 of the
It has a structure in which it is tightened and held by a tightening bolt 7 screwed in, and an AE sensor 3 is adhesively bonded to the rear end of the detection pin 2 with an adhesive so that the vibration from the detection pin 2 propagates.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The surface of the grindstone 1 comes into contact with the tip of the detection pin 2 to scrape off the detection pin 2, and the contact is detected by using the AE wave generated only when the surface of the grindstone 1 comes into contact with the tip of the detection pin 2. Since the contact detection can be performed on the surface coordinates (or the diameter of the grindstone) of the grindstone, it is an important process for obtaining the processing accuracy.

However, when the coolant entrained with the grindstone 1 is applied to the outer peripheral surface and the tip surface of the detection pin 2, a pseudo AE wave is generated, and this disturbance phenomenon adversely affects the contact detection accuracy.

An object of the present invention is to provide a contact detection device capable of detecting only a contact signal from a rotating body and a detection pin by preventing a pseudo AE wave generated when a coolant comes into contact with the AE sensor. is there.

[0007]

According to a feature of the present invention for achieving the above object, at least a tip held by a bracket on a fixed surface via a bracket has a pipe shape, and a detection pin with which a rotating body contacts, The AE sensor is coupled to the rear end of the detection pin in a state capable of propagating vibration.

[0008]

With the above structure, the tip of the detection pin is made into a pipe shape and the contact area between the grindstone and the coolant entrained is made small, so that the generation of the pseudo AE wave due to the contact between the coolant and the detection pin is reduced as much as possible, and the precision The contact detection is good.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a grindstone (rotating body), 30 is a fixed cover for covering the grindstone 1, 11 is a pivotally supported by the fixed cover 30 so as to be pivotable, and a movable cover for covering the upper front surface of the grindstone 1 is fixed. It is a coolant nozzle attached to the cover 30.

A headstock 4 is provided in front of the feed of the grindstone 1. As shown in FIG. 2 on the headstock 4, a tightening bolt 7 is inserted into the split groove 6 of the bracket 5 bent in a crank shape and at least the pipe-shaped detection pin 20 is inserted into the split groove 6 and screwed into the split groove 6. Holds by tightening.

A vibration damping material 10 is provided on the outer peripheral surface of the detection pin 20.
Has been applied. The vibration damping material 10 is, for example, a cushioning material such as rubber or sponge, and a tubular material is fitted on the outer peripheral surface of the detection pin 20, a tape-shaped material is wound, or coated.

An AE sensor 3 is adhesively bonded to the rear end of the detection pin 20 provided with the vibration isolator 10 so that the vibration from the detection pin 20 propagates.

Since the present invention has the above-described structure, the grinding stone 1 is sent toward the detection pin 20 after the work is ground and before the grinding stone 1 is trued, and the grinding stone 1 is brought into contact with the detection pin 20 to detect the detection pin 20. To grind. At this time, the coolant applied from the coolant nozzle 12 to the detection pin 20 is applied to the vibration isolator 10 on the outer peripheral surface of the detection pin 20, and the vibration isolator 10 absorbs the contact vibration of the coolant.

Further, since the detection pin 20 is pipe-shaped, the bending rigidity due to the grinding resistance is enhanced, and the contact area between the grindstone 1 and the circulating coolant is reduced. Therefore, the impact force of the coolant exerted on the tip surface of the detection pin 20 is reduced as much as possible.

Further, as in the conventional case, the AE sensor 3 coupled to the rear end of the detection pin 20 is hidden by the bracket 5 to prevent the contact of the coolant.

Therefore, as the contact detection signal displayed on the monitor (not shown) connected to the AE sensor 3, a highly accurate contact detection signal excluding the disturbance phenomenon of the pseudo AE wave due to the influence of the coolant can be obtained.

[0017]

As described above, according to the present invention, at least the tip of which is held on the fixed surface via the bracket is pipe-shaped, and the vibration can be propagated to the detection pin with which the rotating body comes into contact and the rear end of the detection pin. Since it is composed of an AE sensor connected in a state, the accuracy of detecting contact with a rotating body is improved, and when this is adopted in a grindstone truing device such as a grinder, the grindstone surface coordinates (or grindstone diameter) are accurately measured. It can be grasped and the processing accuracy is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a device of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a cross-sectional view of a main part of a conventional device

FIG. 4 is a view on arrow B of FIG.

[Explanation of symbols] 1 grindstone (rotating body) 4 headstock 5 bracket 10 vibration damping material 20 detection pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoichi Yamakawa 1-1, Asahi-cho, Kariya city, Aichi Toyota Koki Co., Ltd. (72) Inventor Hirotaka Sugiura 1-1-1 Asahi-cho, Kariya city, Aichi Toyota Koki Within the corporation

Claims (1)

[Claims] 1. A detection pin, which is held on a fixed surface via a bracket and has a pipe-like shape at least at its tip, is in contact with a rotating body, and an AE sensor coupled to the rear end of the detection pin in a vibration-propagable state. A contact detection device.