JPS61103754A - Bed of machine tool - Google Patents

Abstract

PURPOSE:To collectively discharge chips by utilizing the space at the back of a machine tool by installing a discharge passage for discharging the chips of the machine tool along the center axis line in the longitudinal direction of a bed and a chip conveyer. CONSTITUTION:A chip dropping port 22 is formed on the side in proximity to a column 14 at the center part of a bed 12. A chip carrying-out passage 24 is formed along the center axis line in the longitudinal direction of the bed 12 from the lower part of the chip dropping port 22. A part of the chip conveyer 26 is arranged in the chip carrying-out passage 24, and the chips dropped onto the conveyer 26 are carried outside along the center axis line in the longitudinal direction in the bed 12. Therefore, the chips formed through working are always on the center axis line of the bed 12, and the thermal transmission of the heated chips on the bed 12 can be carried-out symmetrically. Further, each lateral width of the carrying-out passage 24 and the conveyer 26 can be set wide.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a bed for a machine tool, and more specifically, to a bed for a machine tool that can prevent thermal deformation due to 17] IFi.

[Conventional technology j] In highly automated machine tools, especially numerically controlled machine tools, improving and stabilizing machining accuracy is an extremely important issue.

Factors that influence machining accuracy include geometric accuracy, rigidity, and thermal displacement.Thermal displacement of this type of machine tool is, for example, The machine expands, contracts, or deforms mainly due to thermal factors from inside and outside the machine tool, such as environmental changes such as direct sunlight on the machine, ventilation, and heat generated by the machine itself during operation. Phase 2 between the I product and the shell (2): By causing an error in the J position, it will adversely affect the product accuracy.

The heat sources of the main body include the main shaft system, which includes the main bearing, drive gear, bearings, lubricating oil, etc., and the feed and positioning system, which includes the drive section, feed screw, guide surface, motor, and hydraulic system. Examples include carcasses and chips.

Countermeasures for the machine body mentioned above include minimizing the amount of heat generated by the machine itself, separating or isolating the cold part or the heat source part for heating from the machine body, and improving the accuracy of heat deformation. Measures to prevent this effect include making the heat distribution even, and making the machine structure thermally symmetrical.

In making the structure of a machine tool thermally symmetrical,
Conventionally, the base point of heat generation has been exclusively set at the spindle head. For example, in the columns of many machining centers these days, the spindle head is placed in the center of the column so that the heat from the spindle head is transmitted evenly and symmetrically to the left and right sides of the column. . It uses a center mount type bottom structure.

[Problem to be solved by the invention 3. As mentioned above, in the past, attempts have been made to solve the heat generation in the R region itself through thermally symmetrical design, focusing exclusively on the heat generation at the spindle head. . However, during one machining process, it is necessary to prevent hot chips from boiling down in the bed of the machine tool, or by heating the bed and causing deformation before it passes through the bed and is carried out to the outside. .

In particular, heat generation in the spindle head can be controlled by many means with regard to correction of thermal displacement. However, even if chips are cooled using chip liquid,
It is difficult to cool the steel sufficiently, so the heat exchanged is stored in the chip liquid and is deposited in the bed together with the chips, and then passes through this and deforms the bed, which is a V plate that supports the column. . Therefore, it is not possible to ignore the thermal deformation of the bed and expect the results of the thermally symmetric design of the column.

[Object of the Invention] In consideration of these problems, the main object of the present invention is to provide a bed for a machine tool that can suppress thermal deformation caused by high-temperature chips.

Another object of the invention is to provide a machine tool bed in which the heating of chips makes the bed thermally symmetrical with respect to the central axis of the bed.

A further object of the present invention is to eliminate the problem that, when multiple machine tools such as machining centers are arranged in parallel, a chip conveyor that transports chips in batches becomes a hindrance to the allocation of machine tools. There is no machine tool bed to offer.

The above-mentioned aspects of this invention and its benefits will be explained in detail with respect to the structure and effects of this invention.

[Configuration 1 of the Invention] FIGS. 1 and 2 are schematic diagrams illustrating an embodiment in which the present invention is applied to a machine tool 10, for example, a single column machining center.

Prior to describing the above-mentioned practical example of the present invention,
The conventional configuration of this type of machine tool will be described with reference to FIGS. 3 and 4. A conventional machine tool 110 has a bed 12 and a column 14.

The main structural parts are a spindle head 16, a saddle 18, and a table 20. In order to remove chips, a chip drop opening 1 is provided in the center of the bed 12 near the column 14.
22, and a chip discharge path 124 is formed from the lower part of the l/J chip drop opening 22 in the direction β1 perpendicular to the longitudinal axis of the bed 12. A part of a chip column 7126 is disposed in this chip discharge path 124, and the chips that have fallen from the upper cape of the conveyor 126 are transferred laterally within the bed 12 along its longitudinal axis, i.e. It is carried out in the direction of the arrow in FIG. Therefore, in the process of chip removal, the chips heated by heat asymmetrically heat only one side of the bed 12. This causes a deformation in the bed 12 that causes the column 14 to tilt in the direction 1j.

Furthermore, since the chip ejection path 124 is formed across the center of the bed 12, it not only reduces the rigidity of the bed 12, but also makes it difficult to make the width of the ejection path 124 sufficiently wide due to the structure of the machine. Chip conveyor 1
There is a disadvantage that even one width of 26 cannot be made enough to remove chips.

[Ji! Description of aspects 1 By the way, the actual tN of this invention shown in FIGS. 1 and 2
In this embodiment, a chip drop opening 22 is provided in the center of the bed 12 on the side adjacent to the column 14. It should be noted that this chip drop opening 22 may be provided around the central axis of the bed 12 in multiple turns as necessary. A chip discharge path 24 is formed from the bottom of the chip drop opening 22 along the longitudinal central axis of the bed 12, and a part of a chip column 1726 is disposed within this chip discharge path 24. 2G
The chips that have fallen onto the bed 12 are carried out to the outside along the longitudinal axis of the bed 12.

According to the invention, as is clear from the foregoing, the heat generated by the machining process is always on the center line of the bed 12, so that the heat transfer on the bed 12 of heated scraps takes place symmetrically. It will be done. Furthermore, the unloading path 24
By forming this, the rigidity of the bed 12 is not impaired, and the width of the primary outlet 24 and the conveyor 726 can be configured to be sufficiently wide.

The bed of the τ (N) machine according to the present invention can be applied not only to the single collet 11 machining center described below, but also to so-called portal machine tools equipped with cross rails.

An example of application to a portal will be explained with reference to FIGS. 5 to 7. A pair of housings 30 are provided upright on both sides of the bed 12, and cross rails 32 are provided to bridge over the housings 30.
A saddle 18 is attached to the main shaft 1t (i16
is mounted on this saddle 18. The double guide 20 has two guide surfaces 34 provided on the top surface of the bed 12.
Can you move up?

According to the present invention, the chip fall port 22 is provided on the longitudinal central axis of the T-bend, as in the previous embodiment, and is aligned laterally with respect to the chip fall port 22 on the outside of the guide surface 34. Furthermore, chip fall ports 22A and 22B are provided6.
A chip conveyor 26 is disposed in the chip discharge path 24 along the longitudinal central axis of the bed. Chips fall port 22
．． 22△, cut 1i from 22B! The chips that have fallen onto the conveyor 2G in the Ill exit path 24 are carried out of the machine tool 10 in the longitudinal central axis direction by the operation of the conveyor 26.

Note that the chip fall ports 22° 22A are aligned in the horizontal direction of the plane.
, 22B are spaced from each other about the longitudinal central axis of the machine tool 10 F! Several pieces can be provided.

FIG. 8 shows a case (I) in which a plurality of machine tools 10 having beds according to the present invention are arranged in parallel, and a case (I) in which a plurality of conventional machine tools 110 having a chip conveyor 126 arranged in the horizontal direction are arranged in parallel. It is a route map which shows the case (II) where it is arranged.

As is obvious from the figure, according to the present invention, the machine tool 10
The chips are conveyed to the outside of the machine tool 10 by the chip conveyor 26 arranged along the longitudinal central axis of the bed 12, so that the chips are conveyed to the outside of the machine tool 10. Transport this all at once in the direction of arrow B'?
The machine tool 10 of 851J does not interfere with its unloading in the direction of arrow 13.

On the other hand, in the case of the conventional type, when trying to convey the chips all at once as in the case of the present invention, the machine tools 110 in each row obstruct the path, so the two-way conveyor 126 is used. There is the problem of having to install it by burying it under the floor.

[Brief explanation of drawings]

Figure 1 shows the machine tool bellow 1-1j11! of this invention. For clarity, a schematic front view showing the bed section in section, the second
The figure is a schematic side view showing a part of the bed part as a cross section, and Figures 3 and 4 are schematic diagrams showing the case of a conventional machine tool and corresponding to the above-mentioned Figures 1 and 2, respectively. , 5th
The figure shows the case where this invention is applied to a double-column machine tool.
6 is a schematic side view showing the section of the bed in FIG. 5, and FIG.
-IJi side view, Sj8 diagram is a schematic diagram 6 explaining the case in which (I> multiple machine tools of this invention and (II) multiple conventional machines are arranged in parallel, respectively).
be. The symbols in the drawings are as follows. 10... Machine of this invention 12...
... Bed + 4 ... Column 16 ... Spindle head 18 ... Saddle 20 ... Table 22, 22A, 22B ... Chips falling Mouth 24・
...Chip discharge path 26 ...Chip conveyor 30 ...Housing 32 ...Cross rail 34 ...Guide surface 110 ...・Conventional machine tool 122...Chip dropping port 124 of conventional machine tool
・・・・・・Chip discharge path 12G of conventional machine tool...
・・・Chip of conventional r work 1IllFli \V
Proceedings Amendment November 150, 1981

Claims (1)

[Scope of Claims] 1. A chip drop-off port is provided on the longitudinal center axis of the bed of the machine tool; A chip discharge path is provided in the bed centering on the longitudinal center axis; and the removal. A bed for a machine tool, characterized in that a chip conveyor is disposed along the longitudinal central axis in the path, and the conveyor extends from inside the bed to outside the machine tool. 2. The bed for a machine tool according to claim 1, wherein there are a plurality of chip drop ports, each of which is arranged at intervals on the longitudinal central axis of the bed. 3. The machine tool according to claim 1 or 2, further comprising a chip fall port provided on the longitudinal center axis of the bed, and further provided with chip fall ports on both sides of the longitudinal center axis. bed.