JPS6080501A - Simultaneously both surfaces working type machine tool - Google Patents

Abstract

PURPOSE:To enable both surfaces of a work to be simultaneously worked with a cutter shaft and a separate tool rest by inserting a chuck draw bar into a spindle and the cutter shaft into a hollow portion of the bar and providing respective hydraulic units on the end to be driven forward and backward respectively. CONSTITUTION:A chuck draw bar 12 for opening and closing a chuck 5 is inserted into a bore 11 of a spindle 6 journalled by bearings 7, 7 in a head stock 2, journalled by a bearing 13 and a bearing 14e in a fluid unit support frame 14f and provided on the end with hydraulic units 14. A piston 14b capable of adjusting the stroke of the chuck draw bar 12 is moved forward and backward to open and close the chuck 5 for clamping a work a. Also, a cutter shaft 17 having a cutter 16 on the end inserted into a bore 15 of the chuck draw bar 12 is journalled on the front and rear portions by bearings 18, 18 and moved forward and backward by a piston 19b capable of adjusting the stroke of a fluid unit 19 provided on the end to work an end of a work a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly applied to the machining of piston materials for engines, and is a simultaneous machining process that enables simultaneous machining of the inner diameter of the skirt spigot at one end and center hole machining of the other end. Regarding formula machine tools.

The applicant of the present invention has previously developed a machine tool of this type, as seen in, for example, Japanese Utility Model Publication No. 50-25916, which has a main shaft on one side that rotates a workpiece on a machine stand, and a main shaft on the other side that processes the workpiece. In a type equipped with a tool rest, 1 the main shaft is configured as a hollow shaft having a shaft hole inside, and a tool shaft having a cutting tool at the tip facing the workpiece is slidably inserted into the shaft hole. We have proposed a type in which the lever fL can be freely driven back and forth, but in this case, the knife shaft is connected to the turret via an interlocking mechanism and driven back and forth, and thus its configuration is tends to be relatively complicated due to the interlocking mechanism, and the chuck at the tip of the chuck that holds the workpiece on the spindle is of a type that is manually opened and closed, which tends to make the work of attaching and removing the workpiece relatively inefficient. It comes with some inconveniences such as digitization.

The purpose of the present invention is to obtain a loading tool free of such inconveniences, and the workpiece is held on the machine stand via a chuck at the tip of the machine so that it can be attached and detached. In a type equipped with a main shaft and a turret on the other side for machining the workpiece, the main shaft is configured as a hollow shaft having a shaft hole inside, and a chuck drawbar for fully opening and closing the chuck is installed in the shaft hole. The drawbar is slidably inserted through the drawbar and has a fluid pressure unit at its tail end for driving the drawbar back and forth, and the drawbar is formed into a hollow shaft having a shaft hole inside, and a cutter at the tip thereof faces the cough work. A blade shaft having a blade shaft is slidably inserted thereinto, and a fluid pressure unit is provided at the tail end of the blade shaft to drive the blade shaft back and forth.

An example of the implementation of the present invention will be explained with reference to the attached drawings.

In the drawing, (1) shows the entire machine, and the machine (1) has a headstock (2) on one side of its upper surface, as shown in Figures 1 and 2.
It is completely fixed and has a reciprocating carriage (4) on the other side that slides back and forth along the guide (3), and on the headstock (2) is a collet that detachably holds the workpiece at its tip. Insert the main shaft (6) with the chuck (5) of the formula and push it backwards!
J-+3) is connected to a prime mover (not shown) so that rotational drive is given to C, and a cutter (9) for machining the workpiece (9) is mounted on the carriage (4). Therefore, the tool rest σω is the reciprocating stand +
41'f: Vertical delivery by Rato and others was given through 7'L.

In the illustrated example, the workpiece a is, for example, a piston a for an engine, as shown in FIG.
The skirt spigot b at one end is subjected to an inner diameter cutting process using the knife (9), and the other end is subjected to a drilling process to form a center hole 0 by means described later.

As clearly shown in FIG. 6, the main shaft (6) consists of a hollow shaft 'fJ) having a shaft hole αυ inside, and a chuck drawbar α2J'c m for fully opening and closing the chuck (5) is provided inside the shaft hole.
The ball slide bearing (supported by 131) is inserted through the ball slide bearing 1A-a so as to be slidable back and forth, and the fluid pressure unit 0 that drives it back and forth is attached to its tail end.

The unit (1 to 1) is a fluid pressure cylinder (14) that is fitted to the tail end of the main shaft (6) and extends rearward.
The piston (14bJ is fitted to the tail end of the 12+, thus the piston<14b) ktl is movable back and forth within the cylinder (14a), thereby the drawbar Q
aK predetermined back and forth movement within the cough shaft hole αV, and therefore the chuck (
5) is provided with a predetermined opening/closing operation, and in this case, the piston (+) is fitted onto the tail end of the drawbar (12) and fixed thereto with a screw (14). (The piston (14b
The cylinder (14a) has a cylindrical portion (14'dJ) that extends forward.
It was fitted onto the tail end of the main shaft (6), and its outer periphery was supported by a support frame (14f) via a ball bearing (14e).

Furthermore, the drawbar (121) is composed of a hollow shaft having a shaft hole α51 inside, and the shaft hole (1ω inside VC) is applied to a drill or other cutter ff61' facing the workpiece a by applying the force of the cutter shaft α at the tip to the front and rear bearings a4α. The fluid pressure unit (11 m long) is supported by ~ and slidably inserted back and forth, and the tail end of the unit is equipped with a fluid pressure unit (11 m long) (II is the fluid pressure cylinder (14 m) as described above. A piston (19b) is fixedly fitted to the tail end of a fluid pressure cylinder (within the cutter axis A7) extending rearward by fitting into a cylindrical part (14gJ) that projects rearward from the cylinder. Thus, by moving the piston (19b) back and forth within the cylinder (19a), a predetermined back and forth movement is given to the cutter shaft housing η, and a double nut type stopper (190 mm) is provided at the rear of the piston (19b). The forward and backward stroke can be adjusted.

The cylinder (19a) is equipped with a ball bearing (19) between the cylindrical part (14gJ) and a double neck (19dJ) so as not to be accompanied by the rotation of the cylindrical part (14g). All movement to is now prohibited.

In the illustrated example, a tool rest (2ω) separate from the above-mentioned tool rest aω is provided on the above-mentioned carriage (4), and this acts to cut the end face of the workpiece a.

The workpiece a is rotated through the chuck (5) and processed by the cutter (9) on the tool post 0() in front of it, for example, cutting the inner diameter of the skirt spigot b. is not particularly different from the conventional one, but in this case, it is driven forward by the cutter shaft (lη is the fluid pressure unit at its tail end) H which is fitted into the main shaft (6) via the chuck drawbar α21. If the workpiece a is
6) Machining due to '', for example, center hole C
It is possible to apply the Kōrou process at the same time, thus making cough work a
The chuck (5) can be machined on both sides at the same time, making the work highly efficient.Moreover, if the chuck (5) is moved back and forth using the dollar bar (a't) + the fluid pressure unit (14) at its tail end,
can be opened and closed to easily attach and detach the workpiece a.

In this way, according to the present invention, the chuck drawbar and the cutter shaft are inserted through the main shaft, and each fluid pressure unit is provided at the tail end of the chuck drawbar, so that these can be driven individually back and forth. 7r mode, it is possible to open and close the chuck with the drawbar to make it easy to attach and detach the workpiece, and also to provide center hole and other machining to the workpiece with the cutter shaft and cooperate with the tool rest in front of it. The workpiece can be machined on both sides at the same time by the motion, making the work highly efficient. For example, they are arranged side by side in two stages, front and rear, and have the advantage of being relatively compact as a whole.

[Brief explanation of the drawing]

Fig. 1 is a side view of an example of the machine tool of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged sectional view taken along the line ■-■, and Fig. 4 is a side view of an example of the machine tool of the present invention.
The figure is a blood diagram of the cutting side of the workpiece. fi+...Machine stand &...Workpiece (5)...Chuck (6)...Spindle u01...Turret U...
Shaft hole Q2+...Chuck drawbar circle...Fluid pressure unit (1ω...Shaft hole (16i...Cutter (I)
7)...Cutter shaft (19+...Fluid pressure unit

Claims (1)

[Claims] In a type of machine that is equipped with a main shaft on one side that removably holds a workpiece via a chuck at the tip and rotationally drives the workpiece, and a tool post on the other side that processes the workpiece, the main shaft a hollow shaft having a shaft hole inside, a chuck drawbar for opening and closing the cough chuck is slidably inserted into the shaft hole, and a fluid pressure unit is provided at the tail end of the chuck drawbar for driving the cough chuck back and forth; Further, the drawbar is formed into a hollow shaft having a shaft hole inside, and a cutter shaft having a cutter at the tip facing the workpiece is slidably inserted into the drawbar, and a fluid for driving the drawbar back and forth is inserted into the tail end of the drawbar. A double-sided simultaneous processing machine tool equipped with a pressure unit.