JPH0418764Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention arranges the sliding surfaces of the carriage supported on the bed and the column supported on the carriage at a higher position than the fixed table. This invention relates to a vertical machine tool with a carriage sliding surface located at a high position, which prevents damage to the surface from chips, etc., and increases column rigidity to enable high-precision machining.

[Prior Art] In a vertical machining center, a headstock that pivotally supports a main shaft that grips and rotates a tool slides in the vertical direction (Y-axis) along a column. The column slides on the carriage along the front-rear direction (Z-axis),
The carriage slides along the sliding surface on the bed of the machine in the left-right direction (X-axis).

The workpiece is placed and positioned on a fixed table placed on the bed. The fixed table is provided at a position opposing the main shaft.

Conventionally, the position of the sliding surface of the carriage was slightly higher than the position of the top surface of the fixed table (the height difference was approximately
100mm). In order to enable the positioning of complex workpieces, there is a tendency for the number of component parts of jigs that hold the workpieces to increase. Also,
Since a clamping device or the like is employed to accurately position the workpiece, the number of parts increases further due to the parts of the clamping device. Therefore, the volume occupied by the jig on the fixed table becomes large. As the volume of the jig increases, especially the dimension in the height direction, the moving distance of the headstock in the Y-axis direction increases accordingly, and the height of the column increases. As the height of the column increases, the weight of the column increases. When the weight of the column, which is a moving body, increases, it becomes difficult to maintain the precision of the machine, and the whole machine becomes larger and heavier. Furthermore, when the headstock is located at a high position, a large moment is applied to the column side due to cutting resistance acting on the spindle. Therefore, a problem arises in that the column and the entire machine must be made thick and heavy.

On the other hand, when machining a workpiece, chips and cutting oil are scattered from the workpiece on the fixed table. As described above, if the height difference between the fixed table on which the work is mounted and the sliding surface of the carriage or the like is small, chips and cutting oil scattered on the fixed table will scatter and adhere to the sliding surface side. Therefore, problems arise in that smooth sliding of the carriage and the like is hindered and the sliding surface is damaged.
In addition, the machine is configured so that the generated chips and cutting oil are poured onto an inclined plate provided on the bottom side of the machine and discharged outside the machine, but since the distance between the sliding surface and the inclined plate is narrow, cutting A problem arises in that the powder is blocked in the middle and cannot be discharged smoothly.

[Problems to be solved by the invention] This invention solves the above-mentioned problems by securing the machining area of the main spindle without changing the height of the entire machine, and by lowering the height of the column. The carriage sliding surface is located at a high position to improve rigidity, protect the sliding surface by preventing chips and cutting oil from adhering to the sliding surface, and facilitate the discharge of chips, etc. The purpose is to provide vertical machine tools.

[Means for Solving the Problems] In order to achieve the above objects, the present invention includes a carriage that is slidably supported on the bed along the X-axis direction (horizontal direction), and a Z A column supported slidably along the axial direction (back and forth direction), a headstock supported slidably by the column along the Y-axis direction (vertical direction), and a headstock mounted on the bed. In a vertical machine tool, the lower surface of the carriage is at least lower than the upper surface of the fixed table.
This constitutes a vertical machine tool with a carriage sliding surface located at a height of 200 mm or more.

[Operation] While keeping the overall height of the machine in its original position, lower the bottom of the carriage at least 200 mm from the fixed table.
By arranging it at a higher position, the height of the column itself becomes lower. Therefore, the bending rigidity of the column is increased, and deformation during cutting is reduced. In addition, this allows for high-precision machining. On the other hand, since the bottom surface of the carriage is placed at a high position, the degree of scattering and adhesion of chips etc. to the sliding surface of the carriage and the sliding surface of the column supported on the carriage is reduced, and the sliding surface is protected. At the same time, the space on the inclined plate for discharging chips and the like becomes wider, and the discharge of chips and the like can be carried out smoothly.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a front view of the vertical machining center, and FIG. 2 is a side view of FIG. 1. As shown in FIGS. 1 and 2, the headstock 7 that pivotally supports the main shaft 13 of the vertical machining center slides on the sliding surface 8 of the column 6 along the vertical direction (Y-axis). On the other hand, column 6
is the front-back direction (Z) on the sliding surface 5 of the carriage 4.
axis). Further, the carriage 4 slides along the left-right direction (X-axis) on a sliding surface 14 of a support stand 10 supported on the bed 9 and a slide base 12 fixed above the support stand 10. A fixed table 3 on which unillustrated workpieces and jigs are mounted is supported on a bed 9.

The height difference A between the upper surface 2 of the fixed table 3 and the lower surface 1 of the carriage 4 is approximately 300 mm. This increases the height difference by 200mm compared to the conventional model.
On the other hand, the height of the top of the column 6 remains the same as that of the conventional one. Therefore, when the height of the carriage 4 is the same as the conventional one, the column 6 is supported on the sliding surface 5 of the carriage 4 in a state 200 mm shorter. As a result, column 6
weight is reduced.

On the other hand, an inclined plate 11 is provided within the bed 9 from near the front end of the bed 9 toward near the rear end.
The inclined plate 11 covers the lower side of the fixed table 3 and functions to discharge chips and cutting oil falling from the fixed table 3 to the rear end of the bed 9 along the slope.

A jig (not shown) for holding a workpiece is positioned and fixed on a fixed table 3, and predetermined processing is performed.
The headstock 7 moves up and down on the sliding surface 8 of the column 6 along the Y axis, the column 6 moves back and forth on the sliding surface 5 of the carriage 4 along the Z axis, and the carriage 4 The sliding surface 14 of is moved left and right along the X-axis. Since the lower surface 1 of the carriage 4 is located at a high position (approximately 300 mm) from the upper surface 2 of the fixed table 3, the sliding surface 8 of the column 6 is used entirely from its lower end to its upper end, and the main shaft 13 is located in that range. Machining is performed by moving up and down. Therefore, even if the workpiece is supported on a jig with a high overall height, the main spindle 7 can perform processing over almost its entire movement range. In addition, since the position of the sliding surface 5 that supports the column 6 becomes higher and the overall height of the column 6 becomes lower, the cutting force received by the main spindle 7 during machining does not reach the column 6 side, and the bending moment becomes smaller. 6 has a large bending rigidity. Furthermore, since the overall height of the column 6 is reduced, the column 6 becomes lightweight, and the load of the driving force for moving the column 6 along the Z-axis and the X-axis is reduced.
Thereby, movement accuracy is improved, and processing accuracy can be improved. On the other hand, since the sliding surfaces 5 and 14 are located at a high position away from the upper surface 2 of the fixed table 3, chips and cutting oil generated on the fixed table 3 scatter and adhere to the sliding surface 1. less to do. As a result, the carriage 4 and the column 6 can slide smoothly, and the sliding surfaces 5 and 14 are not damaged by chips, resulting in an improved service life. In addition, since the lower surface 1 of the carriage 4 is at a high position, the mounting position of the member that prevents the discharge of chips on the inclined plate 11 is raised, and the space above the inclined plate 11 can be widened, so that chips and chips can be removed. Cutting oil is drained smoothly.

[Effects of the invention] As is clear from the above explanation, the following effects can be achieved according to the invention.

(1) Even if a jig with a large volume (height) is used, the spindle can move a full stroke, eliminating unnecessary sliding surfaces.

(2) Machining accuracy is improved by reducing the weight of the column.

(3) The rigidity of the column is improved by lowering the column.

(4) By positioning the sliding surface at a high position, it is possible to protect the sliding surface from chips and cutting oil, eliminating damage to the sliding surface and increasing the service life.

(5) Smooth discharge of chips can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1. 1... Lower surface of the carriage, 2... Upper surface of the fixed table, 3... Fixed table, 4... Carriage, 5, 8, 14... Sliding surface, 6... Column, 7
... Headstock, 9 ... Bed, 10 ... Support stand, 1
1... Inclined plate, 12... Slide base, 13...
...Main axis.

Claims (1)

[Scope of utility model registration request] A carriage supported on the bed so as to be slidable along the X-axis direction (horizontal direction); a column supported on the carriage so as to be slidable along the Z-axis direction (front-back direction); In a vertical machine tool equipped with a headstock slidably supported along the Y-axis direction (vertical direction) and a fixed table for mounting a workpiece placed on the bed, the lower surface of the carriage is A vertical machine tool with a carriage sliding surface located at a high position, characterized by being located at a position at least 200 mm higher than the top surface of a fixed table.