JP2601583Y2 - Workpiece steady rest device in the spindle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steady rest device for a bar-shaped workpiece supplied through a hollow hole of a main shaft in a machine tool.

[0002]

2. Description of the Related Art In a machine tool for processing a long bar-shaped work, as shown in FIGS. 3 and 4, a bar-shaped work W is supplied by a work feeder (bar feeder) 3 disposed behind a spindle 1. A chuck 4 fixedly attached to the front end of the spindle 1 while being inserted into the hollow hole 2 of the spindle 1 and sent out intermittently by a predetermined length.
The workpiece W is rotated by rotating the main shaft 1 and the workpiece W is rotated to perform turning or the like. At this time, the intermediate portion of the rod-shaped work W supported between the chuck 4 and the work supply device 3 and located in the hollow hole 2 of the main shaft 1 swings in a skipping rope shape due to centrifugal force accompanying the rotation of the main shaft 1, Processing accuracy may be reduced. In order to prevent such a run-out of the bar-shaped work W, a steady-state guide tube 5 corresponding to the work diameter is inserted into the hollow hole 2 of the main shaft 1. The steady rest guide cylinder 5 of this type includes a steel integral type extending over the entire length of the main shaft 1 as shown in FIG. 3, and a plurality of resin cylinders 5a as shown in FIG. 2 are fitted in series over the entire length.

[0003]

However, the integrated steel guide tube has a problem in that not only the weight is large and the driving load on the main shaft is increased, but also the rod-shaped workpiece to be inserted is easily damaged. On the other hand, resin guide cylinders are lightweight, soft, and have good slidability, so they are excellent in that they do not damage the rod-shaped work to be inserted. Since the machining accuracy deteriorates and the core is hard to come out, the guide cylinder must be divided into a plurality of cylinders 5a as shown in FIG. In addition, since this type of guide cylinder needs to be replaced each time according to the work diameter, in the case of a guide cylinder divided into a plurality of cylinders 5a, each of the divided cylinders 5a is provided one by one. Since the cylinders 5a having different inner diameters must be taken out to the rear side of the main shaft 1 and reinserted one by one, there is a disadvantage that the replacement operation is extremely complicated and requires much time and effort.

SUMMARY OF THE INVENTION The present invention solves such a drawback, and a steady rest guide device comprising a plurality of divided cylinders can be manufactured in a light weight, and the work can be very easily and quickly replaced. The purpose is to provide.

[0005]

In order to achieve the above-mentioned object, in order to achieve the above-mentioned object, the work-in-spindle device of the present invention is provided with the above-mentioned steadying device.
The guide cylinder has a plurality of resin cylinders that are the same as the resin cylinder.
Multiple thin spacers arranged at equal intervals on the circumference
Via a pipe, the resin cylinder and the spacer pipe
Are connected by a plurality of connecting rods
You.

[0006]

According to the above construction, the steady rest guide tube to be inserted into the hollow hole of the main shaft comprises a plurality of resin cylinders and a plurality of narrow spaces.
With the support pipe, it is lightweight and can be manufactured integrally, and the replacement work can be performed easily and quickly.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a work steadying device 10 according to the present invention. The work steadying device 10 comprises a plurality of cylindrical bodies 11, 12, 13 molded to the same diameter from a synthetic resin material such as nylon while being coaxially spaced apart from one another via a spacer pipe 20 and a spacer ring 21. It is configured by being connected. The front cylinder 11 is an intermediate cylinder 12
And the front end opening 14 is chamfered, and three or four screw holes 15 are provided on the rear end surface on a circle concentric with the axis and at equal intervals in the circumferential direction. Have been. The intermediate cylinder 12 is composed of a plurality of
Each intermediate cylinder 12 is provided with a through hole 16 corresponding to the screw hole 15 of the front cylinder 11. The rear cylinder 13 has a through-hole 17 corresponding to the through-hole 16 of the intermediate cylinder 12, and a flange 18 at the rear end. The spacer ring 21 is provided so that the spacer pipe 20 does not bite into the resin cylinders 11 to 13.

[0009] In Thus, the four connecting rods 23 for 3 to screwed into the screw hole 15 of the front cylinder 11, space as shown
Saling 21, spacer pipe 20, spacer ring 2
1 and the intermediate tubular body 12 in this order, and finally, the through hole 17 of the rear tubular body 13 is fitted into the connecting rod 23, and a nut 25 is provided on the threaded portion 24 provided at the protruding end of the connecting rod 23. Are screwed together and tightened to integrate the whole into a long tubular body.

FIG. 2 shows a lathe spindle incorporating the work steadying device 10 constructed as described above.
The configuration of the lathe main shaft portion is the same as that of the conventional device shown in FIGS. 3 and 4. A work supply device (bar feeder) 3 is disposed behind the main shaft 1, and an adapter 6 is provided at the front end of the main shaft 1. The chuck 4 is fixed. In addition, chuck 4
A draw tube 7 that opens and closes is inserted into the hollow hole 2 of the main shaft 1 so as to be movable in the axial direction. The draw tube 7 is connected to a cylinder shaft 8 a of a chuck cylinder 8 fixed to the rear end of the main shaft 1, and the chuck cylinder 8 moves the draw tube 7 in the axial direction to open and close the chuck 4.

The work steadying device 10 is inserted into the hollow hole 2 from the back of the main shaft 1, penetrates through the hollow portion of the draw tube 7, fits the front cylinder 11 inside the chuck 4, and has the rear cylinder 10. 13 is mounted by detachably fixing the flange portion 18 to the rear end of the chuck cylinder 8 via the fixing ring 9. Then, the rod-shaped work W sent out from the work supply device 3 is inserted into the rear cylinder 13,
The intermediate cylinders 12,... And the front cylinder 11 are inserted and supplied to the chuck 4. The work W is gripped by the chuck 4 in a posture protruding from the front end of the chuck 4 by a predetermined length, and is rotated together with the main shaft 1 to perform turning or the like.

[0012]

[Effect of the Invention] As described above, the work steadying device in the spindle according to the present invention has a plurality of resin cylinders and a plurality of thin
Connected to the spacer pipe with multiple connecting rods and integrated
, The replacement work can be performed very easily and quickly. In addition, each resin cylinder
And each spacer pipe is not directly fixed with screws etc.
So there is play on the whole and smooth following the inner diameter of the spindle.
Can be inserted into the box. Furthermore, connect and fix the whole
Connection rods are not arranged concentrically with the main shaft.
There is a risk that the screw connection part of the connecting rod will loosen due to the rotation of the spindle
Absent.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal side view of a work steadying device according to the present invention.

FIG. 2 is a partial longitudinal side view of a lathe main shaft portion to which the work steadying device is mounted.

FIG. 3 is a partially longitudinal side view showing a conventional apparatus.

FIG. 4 is a partially longitudinal side view showing another conventional apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 2 Hollow hole 3 Work supply device (bar feeder) 4 Chuck 10 Work steadying device 11 Front side cylinder 12 Intermediate cylinder 13 Rear side cylinder 20 Spacer pipe 21 Spacer ring 22 Connecting rod

Claims (1)

(57) [Scope of request for utility model registration] 1. A machine tool comprising: a steady rest guide cylinder inserted into a hollow hole of a main spindle; and a chuck fixed to a front end of the main spindle and gripping a rod-shaped work . The resin cylinder is
A plurality of thin strips arranged at equal intervals on the same circumference as the cylinder
Through the spacer pipe and the resin cylinder
Connected by multiple connecting rods that pass through the
Has been that the work steady rest in the spindle.