CN108655756B

CN108655756B - Gantry machine tool

Info

Publication number: CN108655756B
Application number: CN201810163945.3A
Authority: CN
Inventors: 原田真; 佐佐木靖彦; 片山基志
Original assignee: Sumitomo Heavy Industries Ltd; Sumitomo Heavy Industries Finetech Ltd
Current assignee: Sumitomo Heavy Industries Ltd; Sumitomo Heavy Industries Finetech Ltd
Priority date: 2017-03-28
Filing date: 2018-02-27
Publication date: 2020-12-22
Anticipated expiration: 2038-02-27
Also published as: TW201836756A; TWI658894B; KR20180109682A; JP2018164952A; JP6813406B2; CN108655756A; KR102413400B1

Abstract

The invention provides a gantry machine tool, which aims to realize light weight and improve processing precision. The gantry machine tool of the present invention includes: a first upright (10) and a second upright (20); a cross rail (32) supported by the first column (10) and the second column (20); and a spindle head (332) supported by the cross rail (32), wherein the first column (10) and the second column (20) are respectively provided with inclined struts (15, 25) which incline toward the spindle head (332) side of the cross rail (32) with the first column facing upward. The weight can be reduced by providing the diagonal braces (15, 25), and the rigidity of each column (10, 20) can be improved by making the inclination of the diagonal braces (15, 25) correspond to the headstock (332) disposed on the cross rail (32), so that an increase in load on the headstock side can be effectively resisted. Therefore, weight reduction and improvement of machining accuracy can be achieved.

Description

Gantry machine tool

The present application claims priority based on japanese patent application No. 2017-062240, applied 3/28/2017. The entire contents of this Japanese application are incorporated by reference into this specification.

Technical Field

The present invention relates to a gantry machine tool having a column.

Background

The gantry machine tool includes a transverse rail having both ends supported by a pair of right and left columns, and a headstock supported by the transverse rail.

In such a gantry machine tool, in order to prevent the machining accuracy of the head stock from being affected by the deflection of the left and right columns while the left and right columns are resistant to the weight of the cross rail and the head stock, it is necessary to increase the rigidity of the left and right columns.

In a conventional gantry machine tool, ribs having a convex strip shape are obliquely provided in hollow interiors of left and right columns, thereby improving the rigidity of the left and right columns (see, for example, patent document 1).

Patent document 1: japanese laid-open patent publication No. 10-286734

In the above-described conventional gantry machine tool, the ribs are formed to be inclined with respect to the longitudinal direction of the cross rail, and therefore, high rigidity can be obtained against a load in the longitudinal direction of the cross rail.

However, in the case where the headstock is supported by the cross rail, a load in a direction toward the headstock is likely to be generated in the cross rail, and the rigidity against the load in this direction is not sufficient in the above-described conventional gantry type machine tool. Therefore, the left and right columns may be bent toward the headstock side with respect to the cross rail, and the machining accuracy may be lowered.

Disclosure of Invention

The invention aims to provide a gantry machine tool which restrains the deflection of a stand column and improves the processing precision.

The gantry machine tool of the present invention includes:

a first upright and a second upright;

the transverse rail is supported on the first upright post and the second upright post; and

a main spindle box supported on the transverse rail,

the first column and the second column are each provided with a diagonal brace that is inclined toward the headstock side of the cross rail as it goes upward.

According to the present invention, a gantry machine tool can be provided that suppresses deflection of a column and improves machining accuracy.

Drawings

Fig. 1 is a perspective view showing a gantry machine according to an embodiment of the present invention.

Fig. 2(a) is a perspective view of the first pillar or the second pillar, and fig. 2(B) is a cross-sectional view taken along line W-W of fig. 2 (a).

Fig. 3 is a side view of the gantry-type machine tool for explaining a positional relationship between the extending direction of the diagonal brace of the first column or the second column and the headstock.

Fig. 4 is a perspective view showing a different example of the machining apparatus of the gantry-type machine tool.

In the figure: 1. 1A-gantry machine tool, 10-first column, 20-second column, 11, 21-top plate part, 12, 22-bottom plate part, 13, 23-first column, 14, 24-second column, 15, 25-oblique column, 32-cross rail, 331-saddle, 332-headstock, 34A-machining device, 34A, 34 Aa-grinding wheel (tool), 131, 141, 151, 231, 241, 251-flange, e-extension line.

Detailed Description

[ outline of gantry type machine tool ]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a perspective view showing a gantry type machine tool 1 according to an embodiment of the present invention. In the figure, the X-axis direction and the Y-axis direction are directions orthogonal to each other in the horizontal direction, and the Z-axis direction is a vertical direction orthogonal to the X-axis direction and the Y-axis direction. In the following description, one side in the X-axis direction is referred to as the front, the other side in the X-axis direction is referred to as the rear, one side in the Y-axis direction is referred to as the left, and the other side in the Y-axis direction is referred to as the right.

The gantry type machine tool 1 is a so-called grinding machine that grinds one surface of a workpiece, and includes:

base portions

31a, 31 b; a first upright 10; a second upright 20; a cross rail 32; a saddle 331; a headstock 332; a machining device 34, a table 36 on which a workpiece is placed, and a bed 35.

[ bed body ]

The bed 35 includes a pair of linear guides, not shown, extending in the X-axis direction, and supports the table 36 so as to be movable in the X-axis direction. A not-shown conveyance mechanism for moving the table 36 in the X-axis direction is mounted on the bed 35. The conveying mechanism uses a motor capable of arbitrarily controlling the operation amount as a driving source, and moves the table 36 in the X-axis direction while holding a workpiece (object to be processed).

A pair of

base portions

31a and 31b are coupled to both sides of the vehicle body 35 in the Y-axis direction such that the pair of

base portions

31a and 31b protrude from the vehicle body 35. The first column 10 is placed on the right base portion 31a, the second column 20 is placed on the left base portion 31b, and the lower end portions of the first column 10 and the second column 20 are fixed to the

base portions

31a and 31b by a known method such as bolts or welding.

[ horizontal rail ]

The first column 10 and the second column 20 are vertically provided and arranged in the Y-axis direction with the bed 35 interposed therebetween. A transverse rail 32 is fixedly supported at the upper end portions of the first and

second columns

10 and 20 via a bracket 32a (the bracket on the second column 20 side is not shown) such that the transverse rail 32 extends in the Y-axis direction. The upper ends of the first and second

vertical columns

10 and 20 are fixed to the cross rail 32 by a known method such as bolts or welding.

The lateral rail 32 is elongated in the Y-axis direction, and supports the saddle 331 on the front side thereof via a linear guide not shown so as to be movable in the Y-axis direction.

A transport mechanism, not shown, for moving and positioning the saddle 331 in the Y-axis direction is mounted on the cross rail 32. The transport mechanism also uses a motor capable of arbitrarily controlling the operation amount as a drive source, and can move the saddle 331 in the Y-axis direction and position the saddle at an arbitrary position.

The saddle 331 supports the spindle head 332, and the spindle head 332 supports the machining device 34. On the other hand, the saddle 331 is controlled to move in the Y-axis direction by the cross rail 32, and the workpiece is controlled to move in the X-axis direction by the bed 35 in cooperation with each other. Thus, the machining device 34 can be moved and positioned at an arbitrary position on the X-Y plane of the workpiece, and the entire surface or an arbitrary position of the workpiece can be ground.

[ Main spindle Box and saddle ]

The headstock 332 is supported on the cross rail 32 via a saddle 331 so as to be movable in the Y-axis direction, and is supported on the saddle 331 so as to be movable up and down in the Z-axis direction. The machining device 34 is supported by the lower end of the headstock 332.

The saddle 331 has a function of raising and lowering the head stock 332 in the Z-axis direction.

Therefore, the saddle 331 supports the headstock 332 movably in the Z-axis direction by a linear guide not shown. A not-shown conveyance mechanism for moving and positioning the head stock 332 in the Z-axis direction is mounted on the saddle 331. This conveyance mechanism also uses a motor capable of arbitrarily controlling the operation amount as a drive source, and can move the head stock 332 in the Z-axis direction and position it at an arbitrary position.

[ working apparatus ]

The machining device 34 is held at the lower end of the headstock 332.

The machining device 34 is a grinding device having a disc-shaped or cylindrical grinding wheel 34a rotationally driven around the Y axis as a tool. Grinding wheel 34a is disposed at the right end of the lower end portion of headstock 332. The grinding wheel 34a is rotated and the outer periphery thereof is brought into sliding contact with the workpiece, whereby the workpiece is ground.

[ first column and second column ]

Fig. 2(a) is a perspective view of the first pillar 10 or the second pillar 20, and fig. 2(B) is a sectional view taken along the line W-W of fig. 2 (a).

Since the first column 10 and the second column 20 have the same structure except for the difference in width in the Y-axis direction, the same portions will be collectively described with reference to fig. 2(a) and 2 (B). In fig. 2(a) and 2(B), for the sake of simplicity of explanation, the widths of the first column 10 and the second column 20 in the Y axis direction are indicated to be the same, but as described above, the width of the second column 20 in the Y axis direction is actually wider than the width of the first column 10 in the Y axis direction.

The first column 10 and the second column 20 are hollow columns integrally cast of a metal such as a steel material, and have a substantially trapezoidal shape when viewed in the Y-axis direction.

The first column 10 and the second column 20 include: top plates 11, 21; bottom plate portions 12, 22; the first struts 13, 23; second struts 14, 24 and diagonal struts 15, 25.

The top plates 11, 21 and the bottom plates 12, 22 are each rectangular plates elongated in the X-axis direction, and the bottom plates 12, 22 are longer than the top plates 11, 21. In addition, rectangular openings are formed in the top plate portions 11 and 21 and the bottom plate portions 12 and 22 to reduce the weight.

The first support columns 13, 23 connect the front end portions of the top plate portions 11, 21 and the front end portions of the bottom plate portions 12, 22, and are inclined slightly rearward as they go upward. Also, the first struts 13, 23 are similar in structure to channel steel. That is, the flanges 131 and 231 standing rearward are formed over the entire length of both ends of the first support columns 13 and 23 in the Y-axis direction, and the cross sections of the first support columns 13 and 23 are shaped like "コ".

The second support columns 14, 24 are formed along the Z-axis direction, connecting the rear end portions of the top plate portions 11, 21 and the rear end portions of the bottom plate portions 12, 22. Also, the structure of the second struts 14, 24 approximates channel steel. That is, the flanges 141 and 241 erected toward the front are formed over the entire length of both ends of the second support columns 14 and 24 in the Y-axis direction, and the cross sections of the second support columns 14 and 24 are shaped like "コ".

As described above, the saddle 331 and the head stock 332 are attached to the front side of the cross rail 32. Therefore, the supporting load of the cross rail 32 borne by the first column 10 and the second column 20 is greater on the front side. Therefore, the first struts 13 and 23 have a higher rigidity against a compressive load in the longitudinal direction than the second struts 14 and 24. Specifically, the width of the flanges 131 and 231 of the first struts 13 and 23 (the width in the direction orthogonal to the longitudinal direction of the struts) is wider than the width of the flanges 141 and 241 of the second struts 14 and 24.

The structure in which the rigidity against the compressive load in the longitudinal direction of the first support columns 13 and 23 is made greater than the rigidity against the compressive load in the longitudinal direction of the second support columns 14 and 24 is not limited to this, and other structures may be employed. For example, the wall thickness of the first struts 13 and 23 or the thickness of the flanges 131 and 231 may be increased, ribs may be provided in the vertical direction on the first struts 13 and 23, or reinforcing members may be attached to the first struts 13 and 23.

The diagonal braces 15, 25 connect the front end portions of the top plate portions 11, 21 and the rear end portions of the bottom plate portions 12, 22, and are inclined forward as they face upward. The diagonal braces 15 and 25 are similar in structure to H-shaped steel. That is, flanges 151, 251 erected in both the front and rear directions are formed over the entire length of both ends of the diagonal braces 15, 25 in the Y axis direction.

As described above, in the machining device 34, the grinding wheel 34a is disposed at the right end of the lower end portion of the head stock 332. Therefore, during grinding, the entire headstock 332 is positioned on the left side of the grinding wheel 34a, and therefore the load applied to the second column 20 positioned on the left side is often greater than the load applied to the first column 10.

Therefore, the second column 20 has a higher rigidity against a compressive load in the vertical direction than the first column 10. Specifically, the width in the Y-axis direction of the second pillar 20 is wider than the width in the Y-axis direction of the first pillar 10.

The structure in which the rigidity against the compression load in the vertical direction of the second column 20 is made greater than the rigidity against the compression load in the vertical direction of the first column 10 is not limited to this, and another structure may be employed. For example, the wall thickness of each pillar 23, 24 or diagonal strut 25 of the second column 20 or the thickness of the flange 231, 241, 251 may be increased as compared with the first column 10, a rib may be provided in the vertical direction on each pillar 23, 24 or diagonal strut 25, or a reinforcement may be attached to each pillar 23, 24 or diagonal strut 25 of the second column 20 and the flange 231, 241, 251.

[ relationship between the diagonal braces of the first column and the second column and the spindle head ]

Fig. 3 is a right side view of the gantry type machine tool 1 showing the relationship between the diagonal braces 15 and 25 of the first column 10 and the second column 20 and the headstock 332.

As described above, the diagonal struts 15 and 25 of the first column 10 and the second column 20 are inclined forward as they face upward. When the gantry type machine tool 1 is viewed from the longitudinal direction (Y-axis direction) of the cross rail 32, the headstock 332 is disposed so as to intersect with an extension line e of the diagonal braces 15 and 25 extending in the longitudinal direction thereof. The extension line e of the diagonal braces 15 and 25 passes through the center position in the width direction of the flanges 151 and 251.

The headstock 332 moves up and down with respect to the saddle 331. In fig. 3, a solid line of spindle head 332 indicates an upper limit position of the vertical movement, and a two-dot chain line of spindle head 332 indicates a lower limit position of the vertical movement.

As shown in fig. 3, even if the head stock 332 is raised and lowered within the range from the upper limit position to the lower limit position, the head stock 332 always intersects with the extension line e of the diagonal braces 15 and 25.

[ technical effects of embodiments of the invention ]

In the gantry type machine tool 1, the first column 10 and the second column 20 are provided with the diagonal braces 15 and 25, respectively, which are inclined upward toward the side (front side) of the cross rail 32 where the headstock 332 is provided.

When the head stock 332 is supported on the front side of the cross rail 32, the support load applied to each of the

columns

10 and 20 is larger on the front side, but the diagonal braces 15 and 25 inclined in the above direction have high rigidity against such a load.

Therefore, even when the amount of material used for each of the

columns

10 and 20 is reduced to reduce the weight of the apparatus, high rigidity can be obtained, and the occurrence of flexure in each of the

columns

10 and 20 can be suppressed.

In addition, the inclination of the headstock 332 can be reduced, and the grinding wheel 34a of the machining device 34 can be brought into contact with the workpiece in an appropriate direction, so that the machining accuracy can be improved.

In addition, even if the amount of material used is reduced to about half (approximately reduced to half), the

column

10 or 20 having the diagonal braces 15 or 25 can obtain the same degree of rigidity as that of a normal column, for example, as compared with a normal column formed in a hollow box shape and having a rib (reinforcing structure) in which a rib is provided in the vertical direction.

The gantry machine tool 1 is formed such that the rigidity of the first columns 13 and 23 on the front sides of the first column 10 and the second column 20 is higher than the rigidity of the second columns 14 and 24.

The first column 10 and the second column 20 can increase the rigidity of the cross rail 32 on the side of the head stock 332, and can reduce the deflection of each

column

10, 20, thereby further improving the machining accuracy.

Moreover, since the diagonal braces 15 and 25 of the first and

second columns

10 and 20 are both formed in an H-shaped cross section, the weight of the diagonal braces 15 and 25 can be reduced and the rigidity thereof can be improved, and further, the rigidity of the gantry type machine tool 1 can be maintained, and further, the weight reduction of the entire apparatus can be achieved.

In the gantry type machine tool 1, the second column 20 on the side opposite to the side on which the grindstone 34a is disposed is formed to have higher rigidity than the first column 10, in accordance with the disposition of the grindstone 34a in the Y axis direction of the headstock 332.

When the grinding wheel 34a is disposed on one side (right side) of the head stock 332 in the Y axis direction, the head stock 332 is disposed almost entirely on the left side of the grinding wheel 34a, and therefore the support load applied to the second column 20 disposed on the left side during the machining operation is often increased. Therefore, by making the rigidity of the second column 20 higher than that of the first column 10, the inclination during the machining operation can be reduced, and the machining accuracy of the apparatus can be further improved.

Further, even when the support load applied to the second pillar 20 is increased, durability can be improved by increasing the bearing capacity.

In the gantry type machine tool 1, the headstock 332 is disposed so as to intersect the extension line e of the diagonal braces 15 and 25 of the first column 10 and the second column 20 when viewed from the Y-axis direction.

In the case of this arrangement, the diagonal struts 15 and 25 of the first column 10 and the second column 20 can more effectively achieve high rigidity against the support load caused by the head stock 332 arranged on the cross rail 32.

Furthermore, the spindle head 332 is configured as follows: the headstock 332 always intersects the extension line e of the diagonal braces 15, 25 regardless of the position thereof within the vertically movable range. In this case, even if the machining device 34 is moved up and down during machining, the machining device can be supported with high rigidity at all times.

Therefore, the influence of the up-and-down operation of the machining device 34 can be suppressed, and the machining operation can be performed with high accuracy.

[ others ]

In the above embodiment, the case where the gantry-type machine tool 1 is a grinding machine including the machining device 34 having the grinding wheel 34a has been exemplified, but the type of machining by the machining device is not limited as long as it is a gantry-type machine tool.

For example, as shown in fig. 4, the first column 10 and the second column 20 may be applied to a gantry machine tool 1A such as a cutting machine in which a headstock 332 supports a machining device 34A provided with a tool 34Aa such as an end mill or a milling head.

The gantry machine tool is not limited to a grinding machine in which the rotation axis of the grinding wheel 34a of the machining device 34 is horizontal as shown in fig. 1, and the first column 10 and the second column 20 may be applied to a gantry machine in which the rotation axis is directed in another direction or a gantry machine in which the direction of the rotation axis can be changed and controlled.

Further, the left and right side surfaces of the first column 10 and the second column 20 are both opened, but may be formed in a flat plate shape without an opening. Further, a plate material for closing the opening may be joined thereto, and a cover may be provided.

Claims

1. A gantry machine tool is characterized by comprising:

a first upright and a second upright;

a main spindle box supported on the transverse rail,

the first column and the second column are each provided with a diagonal brace that is inclined toward the headstock side of the cross rail as it faces upward,

the first column and the second column are provided with a top plate portion and a bottom plate portion, respectively, and the diagonal brace connects the top plate portion and the bottom plate portion.

2. The gantry machine of claim 1,

the first column and the second column both have: a first support column provided on the main spindle case side of the cross rail with respect to the diagonal support column; and a second support column provided on the opposite side of the cross rail from the main cage side with respect to the diagonal support column,

the first pillar is formed to have a rigidity higher than that of the second pillar.

3. Gantry machine according to claim 1 or 2,

the cross section of the oblique strut is formed into an H shape.

4. The gantry machine of claim 1,

a tool is disposed on one end side in a longitudinal direction of the cross rail of the headstock,

the second pillar located on the other end side in the longitudinal direction of the cross rail is formed to have higher rigidity than the first pillar.

5. The gantry machine of claim 1,

the headstock is disposed so as to intersect extension lines of the diagonal braces of the first column and the second column when viewed in a longitudinal direction of the cross rail.