JPS61125705A - Safety device of guide bush - Google Patents

Abstract

PURPOSE:To prevent accident previously by breaking power supply by outputting temperature rise of a liner of a guide bush which can adjust a clearance with a rod during operation as a sensing signal of a temperature sensor buried on an outer peripheral sleeve of the guide bush to a running stop device. CONSTITUTION:A guide bush 3 is provided with three slits and a taper unit 10 on an outer peripheral face of the tip, and engaged with a taper unit 14 on an inner peripheral face of the tip of a sleeve 13 and adjusts clearance between the bush 3 and a rod 2 by an adjusting screw 11. A temperature sensor 15 is accommodated in a deep portion of a sensor accommodating hole 15 drilled near to an end face of the tip of the sleeve 13 fixed, and connected to a running stop device 19 outside the sleeve 13. When temperature is suddenly risen by seizuring condition due to entering of chips between the rod 2 and a liner 1 of the bush 3 supporting the rod, the device 19 is operated by output from the sensor 16 to breal power supply, and rotation of the rod 2 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a safety device for a guide push device in an automatic lathe for machining bar materials.

[Prior art and its problems]

In general, automatic lathes for bar machining are configured to rotatably support the vicinity of the cut part of the bar rotated by the main shaft at high speed with a guide push to prevent bending and deformation of the bar during machining. There is. There are two types of guide push: rotating guide push and fixed guide push.Since fixed guide push supports the bar through sliding contact, it may generate heat due to friction with the bar. Since it is placed near the cutting part, fine chips enter the guide push, which increases friction and makes it easier to generate heat.

If the amount of heat generated by the guide push becomes too large, the rod and guide push may seize and become unable to rotate, or the guide pusher itself may be damaged, and the cutting oil that has flowed into the guide push may catch fire. Occasionally, fire accidents may occur, and when such a situation occurs, the damage may be severe, especially in unmanned factories that are computer-managed, as the detection is delayed.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances,
The purpose is to provide a safety device for a guide push device that can prevent accidents caused by overheating of the guide push device.

[Structure of the invention]

In order to achieve the above object, the present invention provides a guide push device for an automatic lathe for bar processing, including a temperature sensor embedded in the guide push device, and an accident prevention device connected to the temperature sensor and operated by the temperature sensor. The configuration includes means.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of the guide push device of the present invention.

In 99, the reference numeral 6 is a guide push, the inner surface of the tip of which is made of heat-resistant and wear-resistant hard material, such as cemented carbide, ceramic, etc., and is in direct contact with the bar 2 to rotate. A freely supported liner 1 is fixed by brazing or the like.

In addition, the guide push 6 usually has three slits and a tapered part 10 on the outer peripheral surface of the tip, and the sleeve 16
The guide pusher 3 engages with a tapered portion 14 formed on the inner circumferential surface of the tip end thereof, and the clearance between the guide push 3 and the bar 2 can be adjusted to an appropriate value using an adjustment screw 11.

A sensor storage hole 15 is formed in the sleeve 16 in the axial direction from the end surface on the main shaft 7 side of the automatic lathe to near the end surface of the tip end, and a temperature sensor 16 consisting of a thermocouple or the like is stored in the deep part of this storage hole 15. , a filler 17 is filled to fix the temperature sensor 16. A lead wire 18 of the temperature sensor 16 is led out of the sleeve 16 and connected to an operation stop device 19 which is an accident prevention means. This operation stop device 19 cuts off the power supply and stops the operation of the automatic lathe when the temperature detection signal output from the temperature sensor 16 reaches a predetermined value.

Reference numeral 20 denotes a sleeve fixing member formed like a collet chuck, into which the sleeve 16 is slidably fitted and fixed at any position in the axial direction, thereby allowing the longitudinal position of the bar to be adjusted. Further, the sleeve fixing members 20 are fixed to the frame body 21 with their tapered portions coming into contact with each other.

When the bar 2 is supported by the guide push device as described above, the bar 2 is supported by the guide push liner 1 and rotates, and the temperature sensor 16 detects the temperature of the sleeve 16 and sends it to the operation stop device 19. It is outputting. Here, if the bar 2 and the liner 1 of the guide push 6 become seize due to the entry of chips or the like and the temperature rises rapidly, the operation stop device 19 is activated by the output of the temperature sensor 16.

to cut off the power to the automatic lathe. As a result, the rotation of the bar 2 is stopped and accidents can be prevented.

Note that the present invention is not limited to the embodiments described above. For example, in the embodiment described above, an operation stop device that directly cuts off the power to the automatic lathe was used as an accident prevention measure.
In addition, an alarm means such as sound or light may be used in combination, and in this case, the operator can confirm the alarm sound or light, take appropriate measures at an early stage, and restart the operation.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the heat generated by the guide push is detected by the temperature sensor, and the operation stop device and
Since an accident prevention means such as an alarm device is activated, it is possible to prevent the occurrence of accidents such as breakage of the guide push due to heat generation or fire accidents due to ignition of cutting oil.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front sectional view of the guide push device. 16... Temperature sensor, 19... Operation stop device.

Claims (1)

[Claims] A guide push device for an automatic lathe for bar processing, characterized by comprising a temperature sensor embedded in the guide push device, and an accident prevention means connected to the temperature sensor and activated by the temperature sensor. Equipment safety equipment.