TW201442805A - Thimble apparatus having rotation speed display - Google Patents

Abstract

A thimble apparatus having rotation speed display is provided. A mandrel is disposed in the interior of the mandrel stem through the front and rear bearings. The front end of the mandrel passes through the mandrel stem and forms a thimble head. A sensing block is provided around the mandrel, and sensors of detecting the sensing block are penetratingly disposed around the mandrel stem. A signal detected by the sensing block is outputted to an external tachometer for displaying. While using the present invention, the mandrel stem is installed in the tailstock of the lathe, and the thimble head leans against the mandrel hole of the workpiece. When the workpiece rotates in accordance with the lathe spindle and drives the mandrel to rotate synchronously, the rotation speed of the mandrel can be detected by the sensors and displayed in the tachometer so that the operator can, by means of adjusting the rotation speed of the mandrel to be consistent with the lathe, allow the tailstock using the most appropriate pressure to drive the mandrel leaning against the workpiece, thereby achieving efficacy of proper abutting.

Description

Thimble device with speed display

The invention relates to a tailstock fitting for a CNC lathe, in particular to a thimble device with a rotational speed display.

The existing CNC lathe is to clamp the workpiece on the chuck of the spindle, and the ejector pin on the tailstock of the lathe is placed against the top hole of the end of the workpiece. When the CNC lathe is set by the numerical controller to display the rotation speed of the spindle, the spindle drives the workpiece to rotate and turn. When the thimble can withstand the end of the workpiece and rotate synchronously with the workpiece, the workpiece can be stably rotated, and then the workpiece is rotated by the cutter.

The thimble structure of the prior art is shown in Figure 1 of the TW Patent Publication No. 242799, "Micro-tunable Structure of the Thimble", which is a top hole of the tip end of the tip end of the mandrel, which is placed against the end of the workpiece, but the aforementioned existing The thimble structure lacks the basis for judging whether the pressure of the lathe tailstock against the workpiece is appropriate. Therefore, when the top is too loose, the workpiece is slipped, causing the thimble head to wear or the center of the workpiece to be offset, which makes the turning unstable, which will result in Increased processing costs and poor processing accuracy.

Since the thimble device of the existing CNC lathe does not have an appropriate basis for adjusting the pressure of the lathe tailstock against the workpiece, when the top is too loose, the workpiece is slipped, causing the thimble head to wear or causing the center offset of the workpiece to cause turning. Disadvantages such as instability. To this end, the present invention adds a stylus device for displaying the rotational speed to detect the rotational speed of the ejector pin, and cooperates with the CNC lathe numerical controller to display the rotational speed of the main shaft, so that the operator has the basis for adjusting the pressure of the tailstock of the lathe against the workpiece, so that the main shaft The rotation speed is consistent with the rotation speed of the mandrel, and the effect that the ejector device can be pressed against the workpiece with an appropriate pressure can be adjusted.

In order to achieve the above object, the present invention provides a thimble device with a rotational speed display, comprising: a top handle, a straight tube extending in the front and rear directions, at the front end portion of the top handle and the rear side of the front end portion a part of each of the head and a handle are formed, and a front bearing and a thrust bearing are respectively fixed at the front and rear positions of the inner circumferential surface of the head, and a mounting hole is penetrated in the outer peripheral surface of the head, and a rear bearing is fixed on the inner circumferential surface of the shank; a mandrel is disposed in the front bearing, the thrust bearing and the rear bearing in the front and rear directions, and the front end of the mandrel protrudes from the front end of the top handle and Forming a thimble, a sensing block is fixed to a peripheral portion of the inner end of the mounting hole in the middle of the mandrel; and a detecting display device is mounted on the mounting hole of the top shank to fix an inductor, The inner end of the sensor protrudes into the inner end of the top handle to form a sensing end, and the sensing end detects the number of times the sensing block rotates in a unit time, and a wire is connected to the outer end of the inductor to connect the wire A tachometer that displays the speed of the mandrel.

Preferably, the mounting hole is a screw hole, and the inductor is screwed and fixed in the mounting hole.

When the invention is used, the handle of the top handle is mounted on the tailstock of the lathe, and the top needle of the front end of the mandrel is placed against the top hole of the end of the workpiece. When the spindle of the lathe drives the workpiece to rotate and rotate, the spindle of the ejector pin rotates synchronously. At this time, the speed of the sensing block and the ejector spindle can be detected through the sensing end of the sensor, so that the operator can compare the thimble spindle with the spindle of the lathe. The difference between the rotational speeds is to determine whether the ejector pin is against the workpiece with an appropriate pressure. If the pressure of the tip against the workpiece is appropriate, the rotational speed of the ejector spindle should be consistent with the rotational speed of the lathe spindle.

When the pressure of the top needle against the workpiece is to be adjusted, it is adjusted by adjusting the front and rear positions of the tailstock of the lathe. When the rotation speed of the ejector spindle is slow, the top is too loose, which causes the workpiece to slip and cause the thimble head. Wear or cause the center deviation of the workpiece to make the turning unstable. At this time, adjust the pressure of the tailstock so that the rotation speed of the ejector spindle is consistent with the rotation speed of the spindle of the lathe, so that the ejector spindle can be pressed against the most appropriate pressure. The workpiece can achieve the effect of reducing the processing cost and improving the processing accuracy by not causing the thimble head to wear or causing the center deviation of the workpiece to make the turning unstable.

10‧‧‧Top handle

11‧‧‧ head

111‧‧‧ front bearing

112‧‧‧ thrust bearing

113‧‧‧Installation holes

12‧‧‧ handle

121‧‧‧ rear bearing

122‧‧‧ rear thread

20‧‧‧ mandrel

21‧‧‧Top needle

22‧‧‧ thimble front cover

23‧‧‧ Sensing block

24‧‧‧ Nut cap

30‧‧‧Detection display device

311‧‧‧ Sensing end

32‧‧‧Wire

33‧‧‧Tachometer

21A‧‧‧spirit

40‧‧‧ tail seat

41‧‧‧Workpiece

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is a cross-sectional view of a preferred embodiment of the present invention.

Figure 3 is a schematic illustration of the implementation of a preferred embodiment of the present invention.

The present invention is a thimble device with a rotational speed display. As shown in the preferred embodiment of FIG. 1 and FIG. 2, the configuration of the ejector device includes:

A top handle 10 is a straight tube extending in the front and rear directions, and a head portion 11 is formed at a front end portion of the top handle 10, and the top handle 10 is The portion on the rear side of the head portion 11 forms a shank portion 12 having a diameter smaller than the diameter of the inner and outer peripheral surfaces of the head portion 11, and is fixed at the front and rear positions of the inner circumferential surface of the head portion 11, respectively. A front bearing 111 and a thrust bearing 112 are disposed, and a mounting hole 113 is vertically penetrated inwardly on the rear side of the outer peripheral surface of the head portion 11. The mounting hole 113 is a screw hole and an inner peripheral surface in the middle of the shank portion 12. A rear bearing 121 is fixed, and the rear bearing 121 is a needle bearing, and a rear thread 122 is formed on the inner circumferential surface of the rear end of the shank portion 12.

a mandrel 20 is a straight rod extending in the front and rear directions, and the mandrel 20 is disposed in the top core 10 and is disposed in the front bearing 111, the thrust bearing 112 and the rear bearing 121, the mandrel 20 The front end protrudes outwardly from the front end of the top core handle 10, and a tip end 21 is formed at the front end of the mandrel 20 extending forwardly from the mandrel 20. The thimble head 21 is a detachable thimble head according to the preferred embodiment. In addition to the preferred embodiment, in addition to the preferred embodiment, the ejector pin 21 is provided as a removable type, and the ejector pin 21 can be formed as a non-removable tapered shape. The present invention is not limited thereto; A thimble front cover 22 is disposed between the inner peripheral surface of the front end edge and the peripheral surface of the rear end edge of the ejector pin 21, and a sensing block 23 is fixed to the peripheral portion of the inner end of the mounting hole 113 in the middle of the mandrel 20, as in this comparison. The preferred embodiment of the sensing block 23 is a metal block which in turn incorporates a nut cover 24 at the rear thread 122 of the handle 12.

In the detection display device 30, a sensor 31 is screwed into the mounting hole 113 of the top handle 10. As in the preferred embodiment, the sensor 31 is a proximity switch capable of sensing a metal block. The inner end of the top handle 10 forms an inductive end 311. The sensing end 311 detects the number of times the sensing block 23 passes through the unit time, that is, the rotational speed of the mandrel 20, and a wire 32 is connected to the outer end of the inductor 31. , electrically connected to the wire 32 The tachometer 33 of the portion displays the rotational speed of the mandrel detected by the sensor 31 by the tachometer 33.

In addition to the foregoing preferred embodiment, the mounting hole 113 is not limited to a screw hole, and the mounting hole 113 may be a long hole, and the inductor 31 may be fitted or otherwise fixed in the mounting hole 113. The means for inserting the fixed inductor 31 in this way is not limited herein.

When the invention is used, as shown in FIG. 1 to FIG. 3, the handle 12 of the top handle 10 is mounted on the tailstock 40 of the lathe, and the ejector head 21 at the front end of the mandrel 20 is combined with a tapered cone 21A to form a tapered cone. 21A abuts against the top hole of the end of the workpiece 41. When the workpiece 41 rotates with the main axis of the lathe, the mandrel 20 is rotated synchronously. At this time, the sensing block 23 of the sensor 31 can detect the sensing block 23 to detect The rotational speed of the mandrel 20 is measured and displayed on the tachometer 33. Thus, the operator can compare the rotational speed difference between the mandrel 20 and the lathe main shaft to determine whether the pressure of the tip 21A against the workpiece 41 is appropriate, if the tip 21A leans against When the force of the workpiece 41 is appropriate, the rotation speed of the spindle 20 should be consistent with the rotation speed of the lathe spindle.

During the adjustment, the operator changes the pressure of the tip cone 21A of the mandrel 20 against the workpiece 41 by adjusting the front and rear positions of the tailstock 40. When the position of the tailstock 40 is adjusted, the rotation speed of the mandrel 20 and the lathe are adjusted. When the rotation speed of the main shaft reaches the same, the mandrel 20 can be pressed against the workpiece with the most appropriate pressure, thereby reducing the processing cost and improving the processing precision.

10‧‧‧Top handle

11‧‧‧ head

12‧‧‧ handle

20‧‧‧ mandrel

21‧‧‧Top needle

22‧‧‧ thimble front cover

24‧‧‧ Nut cap

30‧‧‧Detection display device

32‧‧‧Wire

33‧‧‧Tachometer

Claims (2)

A thimble device with a rotational speed display, comprising: a top handle, a straight tube extending in the front and rear directions, and a head and a handle are formed on a front end portion of the top handle and a rear side portion of the front end portion a front bearing and a thrust bearing are respectively fixed at the front and rear positions of the inner circumferential surface of the head, and an installation hole is penetrated in the outer peripheral surface of the head, and is fixed on the inner circumferential surface of the handle a rear bearing is disposed; a mandrel is disposed in the front bearing, the thrust bearing and the rear bearing in a front and a rear direction, and a front end of the mandrel extends from a front end of the top handle and forms a needle head on the mandrel A sensing block is fixed in a middle portion of the inner end of the mounting hole; and a detecting display device is mounted on the mounting hole of the top handle to fix an inductor, and the sensor extends into the top handle The inner end forms a sensing end, and the sensing end detects the number of times the sensing block rotates through the unit time, and connects a wire to the outer end of the inductor, and connects the wire to a tachometer to display the tachometer The speed of the mandrel. The thimble device with the rotation speed display according to claim 1, wherein the mounting hole is a screw hole, and the inductor is screwed and fixed in the mounting hole.