WO2000000323A1

WO2000000323A1 - Bed for machine tool

Info

Publication number: WO2000000323A1
Application number: PCT/JP1998/002894
Authority: WO
Inventors: Toshio Moro; Koutarou Watanabe
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 1998-06-29
Filing date: 1998-06-29
Publication date: 2000-01-06

Abstract

A bed for a machine tool, which has high rigidity and accuracy. Side walls (100b) respectively disposed in parallel to linear guide members (2, 3) on the top surface of a bed (100) extend downwardly inclinedly from both side edge portions of a top wall (100a) which defines a bed top surface and are combined together at lower edge portions thereof to form inverted triangles, and bed mounting seats (26) are provided at at least one location in the lengthwise direction of bottom ridgelines (100c) defined by connections of the both side walls. The side walls (100b) are contiguous to the top wall at locations directly below the linear guide members (2, 3) on the top surface of the bed (100). Also, an X-axis bed (100X) having the linear guide member (2) in the direction of the X axis and a Y-axis bed (100Y) having the linear guide member (3) in the direction of the Y axis are connected to each other to form a T-shape in plan view. With such arrangement, it is possible to make the bed lightweight and minimize deformations under loading.

Description

Description Machine tool bed Technical field

The present invention relates to a bed for a machine tool such as a wire electric discharge machine, and more particularly, to a bed made of an animal on which an axis moving body such as a work table and a movable column is mounted.

9 to 11 show the configuration of a conventional wire electric discharge machine. An X-axis guide rail 2 and a Y-axis guide 3 are fixed on the upper surface of a bed 1 which is a base of the machine. ^¾

An X-axis table 5 is mounted on the X-axis guide rail 2 by an X-axis slider 4 so as to be movable in the X-axis direction. X-axis table 5 is rotated by X-axis motor 6 X-axis feed by feed nut 8 screwed to X-axis baud screw 7 and X-axis ball screw 7

Moves in the X-axis direction by the mechanism.

A processing tank 9 for storing a processing liquid is placed on the X-axis table 5, and a work fixing table 10 for fixing an object to be processed is arranged in the processing tank 9.

A movable column 12 is movably mounted on the Y-axis guide rail 3 in the Y-axis direction by a Y-axis slider 11. The movable column 12 is moved in the Y-axis direction by the Y-axis feed mechanism using a Y-axis ball screw 14 driven by the Y-axis motor 13 and a feed nut 15 screwed to the Y-axis ball screw 14. I do.

The movable column 12 has an upper movable arm 17 that can be moved in the Z-axis direction (vertical direction) and is fixed to the lower part of the fixed arrangement, which is included in the Z-axis guide rail 16 fixed to the movable column 12. Arms 18 are provided horizontally with each other. The upper movable arm 17 has a Z-axis ball screw 20 and a Z-axis ball screw 20 that are driven to rotate by a Z-axis motor 19. It is moved in the Z-axis direction by a Z-axis feed mechanism using a feed nut (not shown) screwed into the.

An upper wire guide roller 21 and an upper guide member 22 are attached to the movable upper arm 17.

The distal end of the lower fixed arm 18 is located in the processing tank 9 through the side wall of the processing tank 9, and the lower wire guide roller 23 is attached to the distal end of the arm.

The wire electrode 24 is drawn out from a wire bobbin 25 attached to the movable column 12 and is guided by the upper wire guide roller 21, the upper guide member 22, and the lower wire guide roller 23, and is guided by the upper guide member 2. It extends vertically with a predetermined tension applied between the lower wire guide roller 23 and the lower wire guide roller 23, and travels in the vertical direction in this vertical section.

The bed 1 is made of animal, and its basic shape is a rectangular parallelepiped box-like structure as shown in Fig. 11, and the upper wall 1a that constitutes the upper surface of the bed that forms a horizontal plane, It consists of four vertical side walls lb, a bottom wall 1c, and internal ribs 1d. This is the general form of the bed structure, and various measures such as optimizing the thickness of each animal member and arranging the ribs have been implemented.The basic shape of the hexahedron constituting the bed 1 is a rectangular box. It is. The diagonal arrangement of the internal ribs is shown in the JPO published patent publication (Japanese Patent Application Laid-Open No. Sho 60-213344).

At the bottom of the bed 1, there are two (3) installation seats 26 considering the center of gravity, and the installation seats 26 with repelling bolts support the weight of the bed 1 and the whole machine. ing.

In order to increase the rigidity of the bed 1 with the above configuration, there is a method such as simply increasing the thickness of each wall or changing the arrangement of the ribs. There is a limit on

The load acting on the bed 1 having a box-shaped structure basically acts on the bed 1 from above through the X-axis guide rail 2 and the Y-axis guide rail 3 to deform the entire bed. You. In this case, the load imposed on the upper surface of the bed is the largest, and is distributed throughout the entire bed through the rib 1d and the like. However, it is general that the displacement of the upper surface of the bed increases at all times.

The displacement of the upper surface of the bed results in a bending stress acting on the entire surface, and the rigidity of the side wall 1b and the bottom wall 1c does not contribute much. Therefore, it is necessary to make the thickness of the upper surface of the bed sufficiently thick, which causes an increase in weight.

As a countermeasure against this, there is a method of arranging a large number of ribs. However, there is a problem in that the thickness of the animal is limited due to restrictions on the thickness, and there is also a problem that it cannot be made thinner than necessary. In addition, there are cases where the overall dimensions are designed to be small, miniaturization and weight reduction are promoted, but as a result, new problems such as insufficient rigidity may be invited.

In addition, it takes a long time due to the deformation of the bed 1 to adjust the machine's table surface parallel to the level surface, that is, to adjust the machine's table surface in parallel with the leveling bolts located below both sides of the bed 1. Or, there were problems such as changes after adjustment, and it was necessary to solve them.

In addition, it is difficult to maintain the driving accuracy of the driving system on the same plane on the bed 1 because the X-axis and Y-axis driving units are arranged on the same plane. Usually, a guide arrangement close to the table top is selected. In this case, the upper surface of the bead 1 has a stepped shape, and it is difficult to maintain the precision of the bead in machining, and a solution has been required.

Conventionally, in order to improve the weight-rigidity ratio, a method has been adopted in which a side plate of a bed is vertically arranged directly below a linear guide member to make the bed shape a rectangular box. However, the bedding and the repelling bolts that support the entire machine are arranged on the lower surface of the side plates on both sides, and each must be adjusted to achieve the level of the entire machine. Problems have been pointed out, including the imbalance and the level of machinery is not very good.

In addition, machine tool beds are generally composed of animals, which make up a considerable part of the weight of the whole machine, and the ratio of manufacturing efficiency is high.

As a conventional method to reduce costs, concrete containing Alternative products such as those made of heat-resistant materials, those made of the same material including reinforcing bars, and composite concrete containing resin have also been manufactured, but the beads themselves are required to maintain the precision of the machine for a long period of time. It is an extremely important component and must be given the most basic properties, such as being resistant to changes over time and suppressing the unacceptable displacement even when a cutting force is applied.

Recently, a computer-aided design system has been established, and it has become possible to sufficiently consider the arrangement of thick ribs in the bed in advance, but its basic structure is mainly a rectangular box-shaped structure, Optimization of ribs, rib arrangement, wall thickness, etc. is only being considered.

However, on the other hand, the demand for cost reduction is becoming stronger, and measures such as reducing the wall thickness are being taken as a means of reducing the weight. As a result, insufficient rigidity, reduced accuracy, or long-term specifications are required. As a result, obstacles such as inconsistencies have gradually emerged, and radical solutions are expected in addition to conventional methods.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has a structurally high rigidity and high-precision working machine without increasing the weight of an object due to a thicker wall. The purpose is to provide a storage bed. Disclosure of the invention

According to the present invention, the side walls arranged in parallel with the linear guide member on the upper surface of the bed each extend obliquely downward from both side edges of the upper wall constituting the upper surface of the bed, and are formed on the lower edge. To provide a machine tool bed in which at least one bed mounting seat is disposed in a longitudinal direction of a bottom ridge formed by a connection portion of both side walls. it can.

Therefore, there is no bottom wall, and the end wall of the bed is changed from a quadrangle to a triangular shape, so that the area can be reduced and the weight can be reduced without greatly reducing rigidity. Also, whether the load from above acts on the installation seat by concentrating on the bottom ridge line through the inclined side wall. Therefore, the displacement against the load can be minimized. As a result, the weight can be reduced and the displacement with respect to the load can be minimized. In addition, the present invention relates to a machining method in which the side wall is connected to the upper wall at a position directly below the linear guide member on the upper surface of the bed, and extends obliquely downward from the position directly below the linear guide member. A machine bed can be provided.

Therefore, the load acting from the axis moving body such as the work table acts on the inclined side wall through the linear guide member along the surface extension vertical direction, and only the compressive deformation acts on the side wall. The distribution of the load to the upper surface can be suppressed extremely small.

In addition, the present invention relates to a machine in which an X-axis bed having a linear guide member in the X-axis direction and a Y-axis bed having a linear guide member in the Y-axis direction are connected, and the planar shape is a T-shape. A machine bed can be provided.

Therefore, when an axis moving body such as a worktable or a movable column moves axially, these move in the axial direction on each bed, and the load change accompanying the movement is extremely small, and furthermore, they affect each other. Absent.

Further, according to the present invention, an X-axis bed having a linear guide member in the X-axis direction and a Y-axis bed having a linear guide member in the Y-axis direction are connected to form a planar shape or a T-shape. The top height of the bed is the same as the top height of the Y-axis bed, and the top height of the axis moving body mounted on either the X-axis bed or the Y-axis bed. And at least one of the linear guide member in the X-axis direction and the linear guide member in the Y-axis direction is fixed on the upper surface of the bead so that the difference between the height and the height of the linear guide member on the other bead decreases. It is possible to provide a machine tool bed that is mounted via a position adjustment stand.

Therefore, the overall shape of the bed can be easily configured. For example, the height of the linear guide member in the Y-axis direction is substantially the same as the height of the X-axis moving body, and the posture error due to the axial movement can be suppressed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view showing a first embodiment of a machine tool bead according to the present invention, FIG. 2 is a sectional view taken along line A--A in FIG. FIG. 1 is a sectional view taken along line BB of FIG. 1, FIG. 4 is a perspective view showing Embodiment 1 of a bed for a machine tool according to the present invention, and FIG. FIG. 6 is a cross-sectional view (corresponding to line A-A in FIG. 1) of Embodiment 2 of a bead for a machine tool according to the present invention, and FIG. 6 is a sectional view taken along line C-C in FIG. FIG. 7 is a sectional view (corresponding to a section taken along a line A-A in FIG. 1) showing a third embodiment of a bead for a machine tool according to the present invention, and FIG. Fig. 9 is a cross-sectional view taken along line D-D in Fig. 7; Fig. 9 is a schematic configuration diagram of a conventional wire electric discharge machine using a bed; Fig. 10 is a sectional view of a conventional bed; Wire electric discharge machine Is a plan view of Nobe' head portion, the first FIG. 1 is a cross-sectional view of a conventional base head. BEST MODE FOR CARRYING OUT THE INVENTION

Preferred embodiments according to the present invention will be described with reference to the accompanying drawings. In the embodiments of the present invention described below, portions having the same configurations as those of the above-described conventional example are denoted by the same reference numerals as those of the above-described conventional example, and description thereof will be omitted.

1 to 4 show Embodiment 1 of a machine tool bed according to the present invention. Bed 100 is an X-axis bed 100 with an X-axis guide rail 2 on the top of the bed and a Y-axis bed with a Y-axis guide rail 3 on the top of the bed. 100 Y is connected, and the planar shape is T-shaped.

The X-axis bed 100 X and the Y-axis bed 100 Y are the side walls I 0 0 arranged on the upper surface of the bed in parallel with the X-axis guide rail 2 and the Y-axis guide rail 3, respectively. b extends obliquely downward from both side edges of the upper wall 100a constituting the upper surface of the bed, and is joined to each other at the lower edge to form an inverted triangular shape; Of the bottom ridge line 100 c parallel to the X-axis guide rule 2 and the Y-axis guide rail 3.

X axis bed 1 0 0 2 bottom edges of X 1 0 c and Y axis bed 1 0 0 Y bottom There are three installation seats 26 with repelling bolts at one location along the ridge line 100c, and the bed 100 is installed on the floor at three points. The number of seats 26 to be installed can be determined by the size and weight of the bed 100. The bed 100 has an inverted triangular prism-shaped orthogonal structure, and the vertical dimension of the side wall 100b is slightly longer than the conventional rectangular box-shaped structure, but there is no bottom wall. However, the three end walls 100 e of the bed are changed from a quadrangle to a triangular shape, so that the area can be reduced and the weight can be reduced without greatly reducing the rigidity.

A plurality of mounting seats 26 with leveling bolts for supporting the bed 100 may be arranged on the bottom ridge 100 c, and the load from above is pierced through the inclined side wall 100 b. Since it acts on the installation seat 26 in a concentrated manner at 100 c, displacement against load can be minimized. In other words, the compressive load in the vertical direction of the side wall 100b extends in the plane direction and acts mainly, and it can be said that this is an effective use of the side wall (rib).

The bed 100 has a T-shaped structure in which the inverted triangular prism-shaped X-axis bed 100 X and the Y-axis bed 100 Y are orthogonal to each other. When moving axially, each of these moves axially on the bed, so that the load change accompanying the movement is extremely small and does not affect each other.

For example, even if the Y-axis moving body on the Y-axis bed 100 Y moves, the load acts as a compression load only on the inclined side wall 100 b of the Y-axis bed 100 Y. Since a tensile load acts on the upper surface of the shaft bed 100 Y, no deformation occurs in the X-axis bed 100 X.

Further, an installation seat 26 is provided directly below the center of the X-axis bed 100 X, and the installation seat 26 and the installation seat 26 at the rear of the Y-axis are used to move the Y-axis. The effect on the X-axis bed 1 is very small to support the entire load.

Note that ribs 100d may be provided inside the X-axis bed 100X and the Y-axis bed 100Y to improve the rigidity.

5 and 6 show a second embodiment of a machine tool bed according to the present invention. I have. In FIGS. 5 and 6, parts corresponding to FIGS. 1 to 4 are denoted by the same reference numerals as in FIGS. 1 to 4, and description thereof is omitted.

The side walls 100b of the X-axis bed 100 X and the Y-axis bed 100Y are located directly below the X-axis guide rail 2 and Y-axis guide rail 3 on the top surface of the bed. At this position, it is connected to the upper wall 100a, and extends diagonally below the positions directly below the X-axis guide rail 2 and the Y-axis guide rail 3, respectively.

With this structure, the load applied from the worktable 5 etc. acts along the vertical extension of the side wall 100b that is inclined through the X-axis guide rail 2, and only compressive deformation is applied to the side wall 100b. The distribution of the load on the upper surface of the bed can be suppressed to an extremely small value.

In this case, the rigidity of the upper surface of the bed is sufficiently high with respect to the bending deformation in which a load in the tensile direction is applied, or the upper surface, that is, the thickness of the upper wall 100a can be reduced.

7 and 8 show Embodiment 2 of a machine tool bed according to the present invention. In FIGS. 7 and 8, parts corresponding to FIGS. 1 to 4 are denoted by the same reference numerals as those in FIGS. 1 to 4, and description thereof is omitted.

The top height of the X-axis bed 100 X and the top surface of the Y-axis bed 100 Y are the same, and the X-axis moving body (workpiece) mounted on the X-axis bed 100 X The height of the upper surface of the assembly of the table 5 and the fixed table 10) (the height of the upper surface of the work fixed table 10) and the Y-axis moving body mounted on the Y-axis bed 100 ( The X-axis guide rail 2 is arranged directly on the top surface of the X-axis bed 100 X so that the height of the top surface of 1 2) is the same as that of the Y-axis guide rail. Reference numeral 2 denotes a Y-axis bed 100, which is mounted via a height adjustment table 110 fixed on the upper surface of the Y-bed.

With this configuration, the entire shape of the bed 100 can be easily configured, and the height of the Y-axis guide 3 is substantially the same as the height of the work fixing base 10, so that a posture error due to axis movement can be suppressed. Industrial applicability

The bead according to the present invention can be used as a high-rigidity and lightweight bead for various machine tools.

Claims

The scope of the claims

1. The side walls arranged in parallel with the linear guide members on the upper surface of the bed extend diagonally downward from both side edges of the upper wall constituting the upper surface of the bed, and mutually extend at the lower edge. A machine tool bed characterized in that at least one bed mounting seat is arranged in a longitudinal direction of a bottom ridge line formed by connecting the side walls on both sides to be joined in an inverted triangular shape.

2. The side wall is connected to the upper wall at a position directly below the linear guide member on the upper surface of the bed, and each of the side walls extends obliquely downward from a position directly below the linear guide member. The machine tool bed according to paragraph 1 above.

3. The X-axis bed having the linear guide member in the X-axis direction is connected to the Y-axis bed having the linear guide member in the Y-axis direction, and the planar shape is T-shaped. The machine tool bed according to claim 1.

4. The X-axis bed with the linear guide member in the X-axis direction is connected to the Y-axis bed with the linear guide member in the Y-axis direction, and the planar shape is T-shaped. The height of the upper surface of the head is the same as the height of the upper surface of the Y-axis bed, and the height of the upper surface of the axis moving body mounted on one of the X-axis and Y-axis beads. At least one of the linear guide member in the X-axis direction and the linear guide member in the Y-axis direction is fixed on the upper surface of the bed so that the difference between the height of the linear guide member and the height of the linear guide member on the other bed is reduced. The bead of a machine tool according to claim 1, wherein the bead is attached via a position adjusting table.