JPS6119531A - Machine tool - Google Patents

Abstract

PURPOSE:To simplify the process of positioning by a workpiece positioning device for a lathe or the like, by using the difference between the spring forces of a chuck and a tailstock to tentatively hold a workpiece, and bringing a positioning roller into contact with the radial face of the workpiece to position it. CONSTITUTION:A workpiece 12 is pushed from a center 22 toward another center 26 by the difference between the resilient forces of springs 24, 30 provided in a chuck 14 and a tailstock 16, so that the workpiece is supported and moved in a direction A into contact with a stopper 44. The workpiece 12 is thus tentatively held. A slide plate 50 is quickly moved downward so that the roller 58 of a positioning means 54 at the tip of the slide plate is placed between the large- diameter portions 64, 66 of the workpiece 12. A sensor 26 at the tailstock 16 is protruded to push the workpiece 12 in a direction B to bring the roller 58 into contact with the radial face 64a of the workpiece to position it. The constitution and the positioning are thus simplified.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a machine tool that supports both ends of a workpiece and rotates the workpiece to turn its circumferential surface. The present invention relates to a workpiece positioning device.

[Prior art]

Generally, when applying roller vanilla seaming to the journal part of a crankshaft to obtain a predetermined surface roughness, the journal part is subjected to finish turning before being subjected to the process.
A certain level of surface roughness is ensured in the journal portion, and then a predetermined surface roughness is obtained by closing the turning hole formed by the finishing turning process by roller burnishing process.

[Problem that the invention seeks to solve]

By the way, when performing the above-mentioned finish turning, it is necessary to position the turning tool relative to the journal part of the crankshaft, which is the workpiece, but conventionally, the turning part must be positioned with respect to the journal part of the crankshaft, which is the workpiece. However, since a dedicated positioning device must be used to position the cutting tool, the processing cost is high, and the process of using a dedicated positioning device must be added to the machining process, which has the disadvantage of increasing the number of steps. there were.

[Means for solving problems]

In order to solve the above-mentioned problems, springs with different elastic forces are installed in the chuck part and the tailstock part of the machine tool, and both ends of the workpiece are supported by pressure through these springs, and the workpiece is attached in one direction. Then, press one end of the workpiece against the stopper of the tailstock section and temporarily fix it.
A positioning means supporting a roller is disposed at the tip of the cutting tool placed in the turning slide section, and this roller is brought into contact with the thrust surface of the large diameter section formed on the workpiece, and then the workpiece is moved by the chuck section. The work piece is positioned and fixed with respect to the cutting tool.

〔·Example〕 An embodiment of the machine tool according to the present invention will be described in detail below.

FIG. 1 is a conceptual front view of essential parts of a journal lathe 10, which is a machine tool of the present invention.

This journal lathe 10 is composed of a chuck section 14 that supports both ends of a crankshaft 120, which is a workpiece, and a machine main body row that turns a tailstock section 16 and a journal section 18 of the crankshaft 12. ing. Of these, the center n disposed on the chuck portion 14 is biased toward the tail stock portion 16 by a spring U having a predetermined elastic force. On the other hand, the center of the tail stock part 16 is rotatably supported by a cylinder, as shown in the cross-section of the main part of the tail stock part 16 shown in FIG. It is biased toward the chuck portion 14 (FIG. 1) by a spring (9) disposed at. Note that the elastic force of this spring is determined by the elastic force of the spring
! The elastic force of the spring U is set to be smaller than the elastic force of the spring U.

Further, this spring is disposed between the large diameter portion 32a of the rod n and a bearing that supports the rod wing, and the bearing is also connected to a plate 36 fixed to the rear of the cylinder row. is attached to. A collar shell for regulating the movement stroke of the rod 32 is fitted between the large diameter portion 32a of the rod 32 and the bearing rear.

Further, one end of the rod 32 is connected to a actuator 42 of the hydraulic cylinder 4o.

On the other hand, a stopper member for positioning the end of the crankshaft 12 is provided at the bottom of the tail stock portion 16. In addition, the reference numeral 46 in FIG. 2 is a body that accommodates the cylinder row.

On the other hand, a slide plate blade is disposed in the machine main body row shown in FIG. 1, and a turning tool 52 is fixed to the front surface of the tip of the slide plate blade. As shown in the main part front view, side view, and bottom view shown in FIGS. 3 to 5, a positioning means 54 is disposed at the bottom of this machine body row. As shown in FIG. 4, this positioning means 54 is composed of a support plate 56 having a T-shaped cross section fixed to the rear surface of the tip of the slide brake 50, and a row 258 supported on the front surface of the tip 56a. ing. As shown in FIG. 3, this roller 58 is offset by a machining allowance l so that its circumferential surface 58a does not come into contact with the extension line of one cutting edge 52a of the cutting tool 52.

In FIG. 1, reference numeral 6o indicates a vanishing device that performs burnishing and is placed adjacent to the main body of the machine. Further, in FIGS. 3 to 5, the reference numeral 62 indicates the positioning means 54.
This is a fastening member that fixes the support plate 56 of the slide plate 50 to the slide plate 50.

Next, the above-mentioned positioning operation of the journal lathe 1o will be explained, and the configuration will also be explained in more detail.

As shown in FIG. 1, when both ends of the crankshaft 120, which is a workpiece, are supported between the center η of the chuck part 14 and the center of the tailstock part 16, the spring disposed in the chuck part 14 Since the spring force of the center point is larger than that of the spring disposed in the tail stock portion 16, the crankshaft 12 moves in the direction of the arrow while being supported between the center points 26 and 26. On the other hand, since a stopper a is provided on the tail stock 16 side, the end of the crankshaft 12 comes into contact with this stopper 44 and its movement is stopped, and the crankshaft 12 is temporarily positioned with rough accuracy. It will be done. Next, the slide plate group is rapidly moved downward, and the roller 58 of the positioning means 54 disposed at the tip thereof is stopped between the large diameter portions 64 and 66 formed at both ends of the journal portion 18.

Next, as shown in FIG. 2, when the hydraulic cylinder is operated to shorten the actuator 42, the condo 320
When the large diameter portion 32a contacts the collar and is further shortened, the condo 320 passes through the large diameter portion 32a and the collar,
The tail stock portion protrudes by 160 cm, and the crankshaft 12 is moved in the direction of arrow B against the spring of the chuck portion 14 (FIG. 1).

When the crankshaft 12 moves in the direction of arrow B, the thrust surface 64a of one of the large diameter portions 64 comes into contact with the roller 58 of the positioning means 54, as shown in FIG. Stop Tor's movement. After that, the chuck part 14 closes the crankshaft 1.
2 is fixed, the positioning of the crankshaft 12 with respect to the cutting tool 52 is completed. Thereafter, when the slide play 1-50 is further lowered by a predetermined distance while rotating the crankshaft 12, the thrust surface 64a of the journal portion 18 and the large diameter portion 64 is
As a result, only a predetermined cut portion is turned. Note that even if the slide brake 50 is raised after the turning operation is completed, a gap is still formed between the roller 58 and the large diameter portion 64 of the crankshaft 12 by the amount of machining allowance.
The bite 54 and the large diameter portion 64 of the crankshaft 120 do not come into contact with each other, so that the crankshaft 12 is not damaged.

In the above embodiment, the journal lathe 10 is used as the machine tool, and the crankshaft 12 is used as the workpiece.
However, the present invention is of course not limited to the above embodiment, and the present invention can be applied to a machine tool such as an ordinary lathe equipped with a chuck part, a tail stock part, and a carriage on which a cutting tool is arranged. Each component may be applied to position the cutting tool relative to a predetermined portion of the workpiece.

〔Effect of the invention〕

In the present invention, the positioning device is constructed by adding simple improvements to each component of the machine tool without using an independent positioning device, so that the construction is simple and can be provided at low cost. Furthermore, since the positioning work is performed during the workpiece chucking process, the number of machining processes can be reduced compared to the case where an independent positioning device is used.

[Brief explanation of drawings]

Fig. 1 is a front view of a journal lathe to which the work positioning device according to the present invention is applied, Fig. 2 is a cross-sectional view of the main part of the tailstock part, and Figs. 3 to 5 are front views of the main part of the turning slide part. , its side view and bottom view, and FIG. 6 is a front view of the main part of the turning slide section showing the positioning operation. DESCRIPTION OF SYMBOLS 10... Journal lathe,... Crankshaft, 14... Dick part, 16... Tail stock part, 18... Journal part, Machining... Machine body, 40...
...Hydraulic cylinder, necessary...stopper, connection...slide plate, 52...kite, 54...positioning means, 58...roller, 64, 66...large diameter part,
64a... Thrust surface. Figure 3 6a Figure 5 Figure 6

Claims (1)

[Claims] A workpiece in which both ends of the workpiece are supported via a workpiece positioning device consisting of a chuck part and a tailstock part, and the workpiece is rotated to turn a predetermined position on its circumferential surface using a cutting tool placed in a turning slide part. In the machine, the workpiece positioning device includes springs having different elastic forces arranged in the chuck part and the tailstock part, respectively, and an end of the workpiece biased in one direction by these springs to the tailstock part. a stopper for stopping on the side; a positioning means disposed on the turning slide portion and supporting a roller at a tip further than the tip of the cutting tool; and a large diameter thrust surface formed on the work on the roller of the positioning means. A machine tool comprising a hydraulic cylinder that is brought into contact with the hydraulic cylinder.