JP2002178239A - Table feeder for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table feeder for a machine tool with no burnout. SOLUTION: This feeder of the table 4 is linearly movably supported on a pair of guide rails 31 and 31 provided in a bed having recessed-sectional sidewalls 7a and 7b via a pair of sliders 41 and 41. A projecting part suspended to the recessed part of the bed is fixedly provided in the central part in the underside of the table 4, magnets 44 and 44 are provided in the both-sides wall surfaces of the projecting part in parallel to the recessed sidewall of the bed, coils 47 and 47 are provided in the both surfaces of the recessed inner wall surface of the bed, and the two pairs of magnets and coils are formed into a linear motor. This table feeder for the machine tool is characterized in that the operation of the linear motor can linearly move the table, cooling medium passages 47b and 47b for cooling the heat generated from the coils and guide rail cooling medium passages 62 and 62 are provided in the recessed-sectional sidewalls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool such as a grinding machine, a cutting machine, a milling machine, a brainer, a machining center and the like. It relates to a possible table feeder.

[0002]

2. Description of the Related Art As a metal machine tool device, for example, a grinder for grinding a work provided on a table with a grindstone is known (Japanese Patent Application Laid-Open Nos. 55-83567 and 59-5967).
59349, 61-173851 and JP-A-4-14-1
No. 3552, Japanese Patent No. 2970725). 2 and 3 show an example of a surface grinder. In these figures, 1 is a surface grinding device, 2 is a work, 3 is a grindstone, 4 is a table which can reciprocate in a horizontal direction (X-axis direction), 5 is a worktable, 6 is an electromagnetic chuck, 7 Is a saddle that can reciprocate in the front-rear direction (Z-axis direction), 8 is an operation panel, 8b is a button for manually turning a grinding wheel up and down, 9 is a column, 10 is a grinding wheel shaft head, 1
1 is a grinding wheel shaft, 12 is a lifting mechanism for moving the grinding wheel 3 in the vertical direction (Y-axis direction), 13 is a motor, 14 is a screw body, 15
Is a screw shaft, 16 is a bearing, 17 is a safety cover, 18 is a grinding fluid supply nozzle, 19 is a bed, 20 is a tank, 21
Is a filter, 22 is a pump, and 23 is a grindstone motor.

The table 4 has a saddle 7 which can slide on a pair of guide surfaces provided on a bed 19 as shown in FIG.
The table 4 is positioned by a V-shaped orbit portion provided in the table 4, and the table 4 is engaged with its engaging portion (slider) 41, as shown in FIG.
41 supports the guide surface (guide rail) slidably. The lubricating oil in the oil tank 20 of the bed 19 is supplied to the guide surface 31 via the distributor 24 and the oil reservoir 25 by the pump 22. Guide surface 3 of the V-shaped track portion
To move the table 4 smoothly, 1 and 31
Lubricating oil is supplied from a lubricating oil supply nozzle 51 provided on the guide surface, and a thin oil film having a thickness of 1 to 5 μm is formed.

In the grinding apparatus shown in FIG. 2, the table is moved by a hydraulic cylinder. Recently, however, it has been required to increase the moving speed of the table. It has been proposed and has been put to practical use. FIG. 7 shows a mechanism for driving a linear motor to move a table on a guide surface.
No. 62832). In FIG. 6, a table 4 has a member 43 fixed by a plurality of bolts 42, 42, on both side surfaces of which are arranged opposite to each other in parallel on a vertical plane.
One moving body side surface 43a, 43b is formed, and a movable element (for example, a coil) 4
4, 44 'are supported. The saddle 7 has a one-sided opening recess 7a for accommodating the member 43, and a guide surface (guide rail) 31 for guiding the table 4 is formed on the upper surface of the saddle 7, and the guide surface 31 is V-shaped orbital portion 46 formed at the front edge and V-shaped orbital portion 4 formed at the rear edge
6 ′.

The movable body side surfaces 4 are provided on both inner side surfaces of the concave portion 7a.
Support body side faces 43'a, 43'b facing 3a, 43b
Are formed, and stators (for example, permanent magnets) 47 and 47 'are fixed to these support side surfaces 43'a and 43'b. Here, the mover 44, the stator 47, and the mover 4
The 4 'and the stator 47' form two sets of linear motors 45, 45 '. The two sets of linear motors 45, 45 'are arranged in such a direction that suction forces generated between the movers 44, 44' and the stators 47, 47 'act in opposite directions of the table 4. ing. Numerals 48 and 49 are sliding members, and the gaps S2 and S2 between the inner surface of the saddle and these sliding members are
And a width narrower than the gaps S1a and S1b between the stator and the stator 47.

By operating the linear motors 45, 45 ', the table 4 can be driven in the X-axis direction. The linear motor drive table is a personal computer
The maximum speed, the average acceleration / deceleration, and the acceleration / deceleration curve can be freely changed.

The movers 44, 44 'and the stators 47, 4
7 ′ may be either a permanent magnet, an electromagnetic magnet, or a coil (Japanese Patent Application Laid-Open No. 8-192326,
1-266577, JP-A-2000-217379
issue). A linear motor operation table in which the stator is an electromagnetic magnet is disclosed in JP-A-11-313475.

In the grinding device 1 shown in FIG.
The table 4 is provided so as to be reciprocally movable in the direction. The table 4 is provided on the saddle 7 so as to be movable in the left-right direction (X-axis direction), and the column 9 is provided with the whetstone head movable vertically (Y-axis direction). ing. In this surface grinding machine, the work 2 is fixed to the chuck on the table 4, the saddle 7 is moved to determine the position in the Z-axis direction, and the table 4 is reciprocated in the X-axis direction. The rotating grinding wheel of the grinding head is brought into contact with the work, and the grinding head is fed in the Y-axis direction to grind the work. The linear motor drive table is controlled by a pulse command from a personal computer, and can freely change the maximum speed, average acceleration / deceleration, and acceleration / deceleration curve.

The linear motor driven table 4 has an acceleration / deceleration of 0.5 G to 3.5 G and a maximum speed of 100 m / min.
In speed stroke grinding in which the cutting speed is increased by increasing the table speed, the number of reciprocations per table unit greatly affects the grinding efficiency. The reciprocating speed of the table 4 driven by the linear motor depends on the moving length (stroke) of the table on the work surface. For example, when the width is 200 mm, and when the length is 50 mm, 280. Times / minute, when the length is 100 mm, 220 times / minute, the length is 150 mm
At 190 times / minute.

[0010]

When the table is driven at a high acceleration / deceleration, the coil generates heat and the guide surface (guide rail surface) generates a great deal of heat. An object of the present invention is to provide a table feed device for a machine tool, which suppresses heat generation of a coil and heat generation of a table guide surface when a linear motor driving table is moved.

[0011]

A first aspect of the present invention is a tape supported on a pair of guide rails provided on a bed having a side wall having a concave cross section via a pair of sliders so as to be linearly movable. A table feeding device, wherein a projection hanging down from a recess of the bed is fixedly provided at the center of the lower surface of the table, and magnets are provided on both side walls of the projection parallel to the side wall of the recess of the bed. A coil is provided on both sides of the inner wall surface of the concave portion of the bed. A linear motor is constituted by the two pairs of magnets and the coil, and the table can be moved linearly by the operation of the linear motor. A table feeding device for a machine tool, wherein a cooling medium passage for cooling heat generated from a coil and a guide rail cooling medium passage are provided on the side wall having a concave cross section. Things.

A coil is selected as a stator of the linear motor,
Since the coil is provided on the side wall of the bed via the mounting plate having the cooling medium passage, heat generated from the coil when the table is moved is cooled. When a coil is selected as the mover, the flexible hose connected to the cooling medium passage reciprocates with the table, and this hose wears out and needs to be replaced in about one year. In the present invention, the flexible hose or the metal tube for supplying the cooling medium to the cooling medium passage is fixed to the bed and does not move together with the table. Or the metal tube has little wear. Similarly, the electric cable connected to the coil can be housed in the damper and fixed to the bed, so that the electric cable is less worn. Further, since the guide rail cooling medium passage is provided on the side wall of the bed, heat generation of the guide rail is suppressed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a side view of a table feeder of a machine tool driven by a linear motor, showing one embodiment of the present invention.

In FIG. 1, a table 4 is a slider 4
V-shaped guide rails (guide surfaces) 31 through 1, 41,
31 has a structure capable of linearly moving back and forth by a linear motor. In FIG. 1, the V-shaped guide rail and the slider on the left side are hidden by a plate 64.
The guide rails 31, 31 are a combination of V-V, V-V.
Any of a flat combination and a flat-flat combination may be used. The guide rails (guide surfaces) 31, 31 are provided on the upper surfaces of the side walls 7a, 7b of the bed 7 having a side wall having a concave cross section. The plate 64 is provided with a damper 63 for accommodating an electric cable to the coil 47.

At the center of the lower surface of the table 4, a projection 43 hanging down from the side wall recess of the bed is fixed to the table 4 with bolts 43a. The linear motor comprises magnets 44, 44 and coils 47, 47, and magnets 4 are provided on both side walls of the projection 43 parallel to the side walls of the recess of the bed.
4 and 44 are provided, and coils 47 and 47 are provided on both surfaces of the inner wall surface of the concave portion of the bed. A linear motor is constituted by these two pairs of magnets and coils, and the table 4 can be moved linearly on the guide rails 31 by operating the linear motor.

The coil 4 is mounted on the side walls 7a, 7b having concave cross sections via mounting plates 47a, 47a having a cooling medium passage.
7 and 47 are attached, and a pipe 4 is provided in the cooling medium passage.
7b and 47b are connected, and the cooling medium is supplied to the cooling medium passage by a pump (not shown). The cooling medium cools the heat generated by the coils 47,47.

A guide rail cooling medium passage is provided in the vicinity of the guide rails 31, 31 of the side walls 7a, 7b having a concave cross section, and a pipe 62 supplies a cooling medium to the surfaces of the side walls 7a, 7b. Magnets 4 are provided on both side walls of the projection 43 facing the coils 47 and 47 and parallel to the recess side walls of the bed.
4, 44 are fixed with a slight gap provided between the coils. The magnet may be a permanent magnet or an electromagnet using a coil.

Reference numeral 61 denotes a stopper fixed to the center of the bed 7, which prevents the table from overrunning and jumping out of the apparatus when any control mechanism of the linear motor fails. I do. 66 is a dog (piece) and 65 is a limit switch.

Although the present invention has been described using a grinding machine, the table feeder of the present invention can be used for a table feeder of a machine tool such as a lathe, a cutting machine, and a machining center. It is.

[0020]

The table feeder for a machine tool according to the present invention can be operated for a long time or reciprocated at a high speed by preventing the coil from burning.

[Brief description of the drawings]

FIG. 1 is a side view of a table guide surface of a machine tool.

FIG. 2 is a perspective view of a surface grinder (known).

FIG. 3 is a side view of the surface grinding machine.

FIG. 4 is a perspective view of a saddle having a guide surface including a V-shaped track on which a table moves.

FIG. 5 is a cross-sectional view showing a table moving mechanism movable by a linear motor.

FIG. 6 is a cross-sectional view showing a table moving mechanism movable by a linear motor (known).

FIG. 7 is a perspective view of another type of surface grinding machine (known).

[Description of Signs] 1 Surface grinding device 2 Work 3 Grinding wheel 4, 4 'Table 6 Electromagnetic chuck 7 Saddle 9 Column 10 Grinding wheel shaft head 19 Bed 30 Support (slider) 31 Guide surface (guide rail) 41 Engaging part 44 Permanent magnet 45 Linear motor 46 V-shaped track part 47 Coil

Claims (1)

[Claims] 1. A table feeding device supported on a pair of guide rails provided on a bed having a side wall having a concave cross-section so as to be linearly movable via a pair of sliders, wherein said table is provided. At the center of the lower surface of the bed, a projection hanging down from the recess of the bed is fixedly provided. On both side walls of the projection parallel to the side wall of the bed recess, magnets are provided. Are provided with a coil, a linear motor is constituted by the two pairs of magnets and the coil, and the table can be moved linearly by the operation of the linear motor. A table feeding device for a machine tool, comprising a cooling medium passage for cooling heat generated and a guide rail cooling medium passage.