JPS5973249A - Work rest for lathe - Google Patents

Abstract

PURPOSE:To disuse an actuator and the associated control system to miniaturize a work rest and as well to simplify the structure thereof having an advantage in its cost, by directly securing a pedestal block provided with a work receiving member, to a cutter bed. CONSTITUTION:A pedestal block 20 used as a work rest body is integrally secured, by means of bolts 21, to the vertical surface 4a of a cutter bed 4 adjacent to a work W. A support plate 23 used as a work receiving member is integrally secured to a receiving container 20a in the pedestal block 20 by means of bolts 24 with a spacer 22 being beforehand disposed therebetween. A cartridge holder 29 having a throw-away chip 28 is secured, by means of bolts 30, to a tool holder 26 which is secured to the upper surface of the cutter bed 4 by means of bolts 27. When the cutter bed 4 is moved forward, a predetermined cutting process is carried out by means of the chip 28.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work rest for a lathe, and particularly to a scattered structure thereof.

For example, in a crank pin lathe that performs radius chamfer cutting for bearings on both ends of the crank pin of a crankshaft, the workpiece, the crankshaft, is unbalanced in terms of weight due to its original structure. In many cases, a so-called chatter phenomenon occurs, and a work rest is provided to prevent this chattering phenomenon.

Fig. 1 shows the configuration of the supporting parts of a crankpin lathe including the conventional work rest described above, in which 1 is a feed stand slidably provided on a ped 2 via a base 3, and 4 is a feed plate.
A tool rest is integrally mounted on the table 3, a cutting tool 5 is attached to the tool rest 4, and a work rest 6 is mounted on the bed 2.

This work rest 6 has a cylinder 8 attached to a bracket 7 fixed to the bed 2 so that its axis intersects the axis of the work W by one line, and a pad that is a work contact part on a piston rod 9 of the cylinder 8. It is made by connecting plungers 1.0 equipped with rivers, and the pad 1.0 is elastically pressed against the workpiece W by the fluid pressure in the cylinder 8 to support the workpiece W from its radial direction. . Toward,
■2 is a cylindrical plunger guide, l knees 3 and 14
is a limit switch that detects the rotation limit of the cylinder 8 by 77 (1").

However, since such conventional work rests use actuators specifically designed for the work rest, they are structurally dependent. Since the pressure of the actuator must be commensurate with the cutting resistance, appropriate control becomes essential, and the cost of the entire device becomes high.

In view of the above points, the present invention was made with the purpose of providing a work rest structure that is small and simple without impairing its original function. -, the workpiece holder that supports the workpiece from the radial direction by attaching J'& M1+ to the workpiece is a workpiece block formed by integrally fixing the members, which is directly attached to the tool rest [^
It is characterized by being constant.

Embodiments of the present invention will be described below based on the drawings. However, the same parts as in the conventional example are given the same reference numerals.

FIGS. 2 to 5 show one embodiment of the present invention. In this embodiment, as shown in FIG. This is an example of a crank bin lathe for chamfering, and as shown in the drawing, the vertical surface 4aK of the tool rest 4 near the workpiece W is integrated with the pedestal block 20, which is the main body of the workpiece rest. At the same time, a spacer 22 is placed in advance on the receiving part zOa of the pedestal block 20, and the support plate 23, which is a member of the workpiece holder, is attached to the port 24.
It is dried in one piece.

Further, a carbide tip 25 with excellent scuffing resistance is brazed to the workpiece contacting part of the support plate 24, so that when the tool post 4 is advanced relative to the workpiece W, the carbide tip 25 is exactly aligned with the workpiece. The dimensions of each K are set so that they touch the outer periphery of the bottle portion P1 or P2 of W.

On the other hand, a cutting tool holder 26 is fixed to the upper surface of the tool rest 4 with bolts 27, and a cartridge holder 29 having a throw-away tip 28 is also fixed to this cutting tool holder 26 with a bolt 30. Visit,
Reference numeral 31 in FIG. 2 is an adjustment screw for adjusting the position of the tool holder 26 by one step, and 32 is a passage for supplying cooling oil.

Therefore, according to the above configuration, as shown in FIG. 3, the work W held by the chucks 32 and 33 of the head stock and tail stock 1 rule is rotated around the axis of the pin portion P1. Rotate the tool rest 4
When the tip is moved forward, a predetermined cutting process is performed by the indexable tip 28. And at this time,
The force that the shake W is trying to push downward due to the cutting resistance is sent simultaneously to the cutter and is supported by the support plates 2 and 3 that are in contact with the workpiece W, thereby also preventing the workpiece W from swinging. prevent the occurrence of

When the cutting process for the pin part P1 is completed, the tool rest 4 retreats, and the driver device (6 (not shown) in the chuck 32 is activated to rotate the workpiece W by 180 degrees (q rotation to change the direction). , pin part P instead of bottle part P1
2 as the center of rotation, and then the other tool rest 4B moves forward and rotates the ζ pin in the same manner as above. Cutting processing for +lI P2 will be performed.

As described above, according to the present invention, the workpiece holder can be downsized by directly fixing the pedestal block equipped with the members to the tool post, eliminating the conventional actuator and associated control system. At the same time, it is advantageous in terms of cost, and has the effect of simplifying the structure and achieving the intended purpose.

[Brief explanation of drawings]

1 is an explanatory diagram of the main part of a crankpin lathe including a conventional work rest structure, and FIG. 2 is an explanatory diagram of the construction of a wall of a clamp bin lathe including the work rest structure as an embodiment of the present invention. , Figure 3 is the plan view of Figure 2, Figure 8g4F
i Enlarged map of Figure 3, Figure 5 1d: Left 0II of Figure 4
It is an I side view. 4... Turret, 2 (11. Rest block (work rest body), 23-. Support plate (work holder is a component), 25... Carbide tip, W... Work (crankshaft). Figure 4 Figure 5 = 297-

Claims (1)

[Claims] (1) A lathe workpiece characterized in that the workpiece holder that contacts the workpiece and supports the workpiece from the radial direction is a pedestal block formed by integrally fixing members and directly fixed to the tool rest. Rest.