JPS63162137A - Working table sliding device in machine tool - Google Patents

Abstract

PURPOSE:To ensure working with a high accuracy at any sliding speeds, by applying a pressure oil between a sliding passage of a sliding guide member and a working table, providing a high-speed feeding means and a low-speed feeding means, and selectively operating these feeding means to slide the working table. CONSTITUTION:In siding a working table 6 at high speed, a high-speed feeding means 10 is operated to apply its driving force to a substantially central position of a side surface of the working table 6 perpendicular to a moving direction thereof, thereby accurately moving the working table 6 along a sliding passage of a sliding guide member 3. In sliding the working table 6 at low speed, a low-speed feeding means consisting of a screw rod 15 and a connecting sleeve 17 is operated to apply its driving force to the working table 6 from its outer side and thereby apply a torque to the working table 6. However, since a pressure oil is present on the sliding passage, the working table 6 is less influenced by the torque, thereby accurately moving the working table 6. Accordingly, highly accurate working may be achieved.

Description

[Detailed Description of the Invention] Object of the Invention (Field of Industrial Application) The present invention relates to a machine tool that processes a workpiece with a workpiece while sliding a worktable, and particularly relates to a machine tool that processes a workpiece with a workpiece while sliding a worktable. This relates to moving equipment.

(Prior Art) Conventionally, this type of work table sliding device includes: 1. A plurality of metal rollers that can rotate around an axis perpendicular to the sliding direction are provided on the sliding path of a sliding guide. There is one in which a work table is slid on the rollers.

(Problem to be Solved by the Invention) However, in this conventional device, if the driving force is not applied to approximately the center of the side surface of the work table by the feeding device along the sliding direction of the work table, the work table will not move. The application of rotational force may cause a shift in the sliding direction, which may impede the guidance, resulting in a problem that the installation location of the feeding device is limited. Further, the above-mentioned phenomenon appears particularly when the work table is moved at high speed, and in that case, there is a possibility that accurate machining cannot be performed. Furthermore, the work table usually
Since it is slid at a constant speed or higher by a single feed drive device such as a hydraulic cylinder, there is a problem in that the variable range of the sliding speed becomes narrow.

This invention was made in consideration of the above circumstances, and its purpose is to extremely reduce the sliding resistance of the work table so that it can slide with a light driving force, and to reduce the sliding speed of the work table. It is possible to switch between low and high speeds, and during low-speed sliding, even if rotational force is applied to the work table, the guidance will not be affected, and during high-speed sliding, deviations in the sliding direction will not occur. Therefore, it is an object of the present invention to provide a work table sliding device that can accurately move a work table along a sliding path and perform highly accurate machining at any sliding speed.

Structure of the Invention (Means for Solving the Problems) In order to achieve the above object, in this invention, static pressure is applied by pressure oil between the sliding passage of the sliding guide and the work table. static pressure applying means; high-speed feeding means for applying a driving force to approximately the center of a side surface perpendicular to the sliding direction of the work table to slide the work table at high speed; and low-speed feeding means for applying a driving force to the work table to slide the work table at a low speed, and configured to selectively operate each of the feed means to cause the work table to slide. .

(Function) Therefore, when sliding the work table at high speed, the high-speed feeding means is activated, and the driving force is applied to approximately the center of the side surface perpendicular to the direction of movement of the work table, causing the work table to slide. It is accurately moved along the sliding path of the guide body. Furthermore, when sliding the work table at low speed, the low-speed feeding means is activated and its driving force is applied to the work table from the outside, thereby applying rotational force to the work table. Due to the presence of pressure oil on the passage, the work table is less affected by its rotational force, and the work table can be moved accurately.

(Example) Hereinafter, an example in which the present invention is embodied in a grinding machine will be described in detail with reference to FIGS. 1 and 2.

A saddle 2 as a sliding guide is mounted on the base frame 1 in the front-rear direction (
It is supported so that it can be moved in the left-right direction (in FIG. 2). A pair of guide rails 3 extending left and right (front and rear in FIG. 2) are arranged at a predetermined interval on the upper surface of the saddle 2, and a concave sliding passageway extending in the longitudinal direction is provided on the opposing surfaces of both guide rails 3. 4 is formed.

A pair of protrusions 7 extending in the longitudinal direction are provided on both sides of the lower part of the work table 6 disposed on the saddle 2, and each protrusion 7 can slide into the sliding path 4 of each guide rail 3. is inserted into. A plurality of oil pockets 8 are bored on each outer surface of each protrusion 7 at predetermined intervals along the sliding direction, and pressure oil is supplied to each oil pocket 8 from an oil pump (not shown). ing. Static pressure due to the pressure oil acts between each protrusion 7 and the sliding passage 4, and each protrusion 7 of the work table 6 removes an oil film from the inner surface of the sliding passage 4 of each guide rail 3. The work table 6 is smoothly slid while being spaced apart by the thickness.

Note that the oil pump, oil pocket 8, etc. constitute a static pressure applying means.

A grindstone 9 as a workpiece is rotatably and vertically movably supported by a column (not shown) erected on the base frame l above the work table 6, and a workpiece W is placed on the work table 6. The work table 6 is placed in a fixed state.
is moved back and forth and left and right, and the grindstone 9 is rotated and moved up and down, thereby grinding the workpiece W.

A piston 11 of a hydraulic cylinder 10 is connected to approximately the center of the right side of the work table 6.
is activated and the piston 11 is moved left and right, thereby moving the work table 6 left and right at a high speed higher than a certain speed (0.5 to 40 m/min in this embodiment). Note that this hydraulic cylinder 10 constitutes a high-speed feeding means.

On the other hand, a locking recess 1 is provided on the front edge of the upper part of the work table 6.
A locking piece 13 with 2 is fixed.

Further, a pair of left and right shaft support pieces 1 are provided on the front upper surface of the saddle 2.
A threaded rod 15 is rotatably supported by 4, and an operating handle 16 is attached to the right end thereof. A connecting tube 17 is rotatably screwed onto the screw holder 15 between each of the shaft support pieces 14, and a connecting piece 8 is provided on the outer periphery of the connecting tube 17.
is installed protrudingly.

Then, as the connecting cylinder 17 is rotated, the connecting piece 18
is selectively arranged in the connecting position shown by the solid line in FIG. It can be fitted and fixed into the locking recess 12. Based on the fitting between the connecting piece 18 and the locking piece 13, the work table 6 is connected to the threaded rod 15.
When the screw rod 15 is rotated by the operation handle 16 in the state where the screw rod 15 is operatively connected to the screw rod 15, the connecting tube 17 and the work table 6 are slid sideways together at a low speed along the screw rod 15. ing. The threaded rod 15, the connecting cylinder 17, and the like constitute a low-speed feeding means.

Further, in this embodiment, the amount of sliding of the work table during one rotation of the operating handle 16 is set to approximately 50 m11, which is slower than when the work table is slid by the hydraulic cylinder 10 described above (less than 0.5 m/min). ) at work table 6
The operation handle 16 is operated when sliding.

Now, when grinding the workpiece W at high speed with the grinding machine configured as described above, first, connect the connecting piece 18 as shown in FIG.
It is placed at the release position shown by the dotted chain line, and the connection between the work table 6 and the threaded rod 15 is released.

In this state, when the hydraulic cylinder 10 is operated, the work table 6 is slid from side to side along the guide rail 3 at a high speed of 0.5 m/min or more.

In this case, since the driving force from the hydraulic cylinder 10 acts on approximately the center of the right side surface of the work table 6, not only is no rotational force applied to the work table 6, but the ridge 7 of the work table 6 and the guide Since static pressure due to pressure oil acts between the rail 3 and the sliding path 4, the work table 6 slides smoothly. And this work table 6
The workpiece W is ground by the grindstone 9 which is rotationally driven during sliding.

On the other hand, when grinding the workpiece W at a low speed, the operation of the hydraulic cylinder IO is stopped, and the locking piece 13 of the work table 6 and the connecting piece 18 of the connecting cylinder 17 are disposed to face each other. Then, the connecting piece 18 is rotated to the connecting position shown by the solid line in FIG. 2, and the connecting piece 18 is fitted and fixed to the locking piece 13, thereby connecting the threaded rod 15 and the work table 6. . In this state, when the threaded rod 15 is rotated by the operation handle 16, the work table 6 is slid at a low speed along the guide rail 3 together with the connecting cylinder 17 that moves along the threaded rod 15.

In this case, rotational force acts on the work table 6, but due to the slow sliding speed and the static pressure caused by pressure oil acting between the guide rail 3 and the work table 6, the sliding force acts on the work table 6. There is no deviation in the direction of movement, and the guidance can be performed accurately to perform grinding with high precision.

Note that the present invention is not limited to the above-mentioned embodiment, and in order to rotationally drive the threaded rod 15, the operation handle 16 is
It is also possible to arbitrarily change the configuration of each part without departing from the spirit of the invention, such as by connecting a geared motor instead of the machine or using a machine tool equipped with a work table other than a grinder. be.

Effects of the Invention As detailed above, the present invention is capable of carrying out work by selectively operating each feeding means while applying static pressure by pressure oil between the sliding passage of the sliding guide and the work table. Since the table is made to slide at a predetermined speed, the sliding speed of the work table can be switched between low speed and high speed. There is no risk of misalignment, therefore, the installation location of the low-speed feed means is not restricted, increasing the degree of freedom in design, and during high-speed sliding, it is possible to prevent misalignment in the sliding direction. Therefore, an excellent effect is achieved in that the work table can be accurately slid along the sliding path at any sliding speed to perform highly accurate machining.

[Brief explanation of the drawing]

FIG. 1 is a front view of a grinding machine embodying the present invention, and FIG. 2 is a side view. DESCRIPTION OF SYMBOLS 1... Base frame, 3... Guide rail as a sliding guide, 4... Sliding path, 6... Work table, 8...
Oil pocket constituting static pressure applying means, 9... Grindstone as a workpiece, 10... Hydraulic cylinder constituting high-speed feeding means, 15... Threaded rod, 17... Connecting cylinder (
A low-speed feeding means is constituted by the above 15.17, etc.), W... Workpiece.

Claims (1)

[Scope of Claims] 1. A sliding guide (3) having a sliding passage (4), and a workpiece supported so as to be slidable along the sliding passage (4) of the sliding guide (3). Table (6) and its work table (
6) A workpiece (9) such as a grindstone for processing the workpiece (W) placed and fixed thereon, and the workpiece (9) is used to process the workpiece (W) while sliding the work table (6). Thing (W)
In a machine tool adapted to process ), a high-speed feeding means (10) that applies a driving force to approximately the center of the side surface perpendicular to the sliding direction of the work table (6) to slide the work table (6) at high speed; and the sliding path. (4) a low-speed feeding means (15, etc.) located on the outside of the work table (6) and applying a driving force to the work table (6) to slide the work table (6) at low speed; A work table sliding device for a machine tool, characterized in that the work table (6) is slid by selectively operating the work table (10, 15, etc.).