JPH0493148A - Cooling structure in machine tool - Google Patents

Abstract

PURPOSE:To stabilize the grinding accuracy of a work with a cooling efficiency being improved, by forming a hole or groove with a heating body or the body to be heated arranged adjacent to the heating body being formed with its being divided in plural plates, and composing a cooling passage with the plural plates being Joined. CONSTITUTION:A heating body 7 or the body to be heated arranged adjacent thereto in a machine tool is formed with its division in plural plates 13a-13h, and also holes 14b-14h, 15b-15h, 16b-16h, 17c-17h, 18h or grooves in the specified shape are formed so that the cooling efficiency may rise based on the temperature distribution of the heating body 7 or the body to be heated on the plural plates 13a-13h. A cooling passage is composed by the holes 14b-14h, 15b-15h, 16b-16h, 17c-17h or grooves of each plate with the plural plates 13a-13h being joined, and coolants 19a, 19b are flowed to this cooling passage. The grinding accuracy of a work can thus be stabilized with the cooling efficiency being improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling structure in a machine tool that prevents thermal deformation of a table of a grinding machine, an electromagnetic chuck, etc. due to heating.

[Prior Art] Conventionally, for example, a grinding machine is equipped with an electromagnetic chuck that fixes a workpiece using a magnetic J. The outer shape of the electromagnetic chuck is composed of an oblong plywood, a case standing upright around the plywood to form a storage section, and a face plate provided on the top of the case.

Further, a rectangular parallelepiped-shaped iron core is disposed at the center of the storage portion, and a coil for exciting the iron core is disposed between the iron core and the inner peripheral surface of the case, thereby forming an electromagnet.

Therefore, by exciting the electromagnet, the face plate is magnetized and holds the workpiece.

[Problem to be solved by the invention] However, when the coil is excited, the iron core generates heat,
This heat is transferred to the face plate and the face plate is bent, making it impossible to stabilize the grinding accuracy of the workpiece.

Therefore, a coolant is injected onto the face plate of the electromagnetic chuck to prevent the electromagnetic chuck from deflecting, but since the heat generation source is inside the electromagnetic chuck, there is a problem in that efficient cooling is not possible.

An object of the present invention is to provide a cooling structure for a machine tool that improves cooling efficiency and stabilizes grinding accuracy of a workpiece.

[Means for Solving the Problems] In order to achieve the above object, the present invention divides and forms a heat generating element in a machine tool or a heated body disposed adjacent to the heat generating element into a plurality of plates, and A hole or groove of a predetermined shape is formed in the plate to increase the cooling efficiency based on the temperature distribution of the heating element or flame, and by joining the plurality of plates, the hole or groove of each plate The gist is to configure a cooling passage and to flow a coolant through the cooling passage.

[Function] With the above configuration, holes or grooves are formed in a plurality of plates,
By joining these plates together, a cooling passage is constructed, and by flowing a coolant through this cooling passage, the heating element can be cooled by the heat generating element disposed inside or adjacent to the cooling passage.

"Embodiment" Hereinafter, an embodiment in which the present invention is embodied in an electromagnetic chuck will be described based on the drawings.

As shown in FIGS. 2 and 3, a frame (not shown) of the grinding machine is provided with a movable table L that can move in the left-right direction and front-rear direction. An electromagnetic chuck 2 for suctioning and fixing is fixed.

This electromagnetic chuck 2 has a substantially rectangular box shape, and includes a mounting plate 3 fixed on the movable table 1, and the mounting plate 3'-
A main body member 4 that is installed upright and has a storage recess 4a, a suction cup 5 that covers the edge of the main body member 4 and has a suction surface 5a that suctions and fixes a workpiece W to the surface of the main body member 4, and the storage recess. 4a
It is composed of an electromagnet 6 disposed at.

The electromagnet 6 includes an iron core 7, which serves as a heat generating element, disposed approximately in the center of the storage recess 4a, and an epoxy resin (not shown) which is wound around the outer periphery of the iron core 7 and has excellent electrical insulation.
It consists of a winding 8 filled with. Further, the mounting plate 3 of the electromagnetic chuck 2 has a connection hole 9a that communicates with the outside and the storage recess 4a.

9b, 10a, and 10b are drilled, respectively.

Further, as shown in FIGS. 1 and 3, first and second cooling passages h and 12 are formed inside the core 7 and are alternately arranged three-dimensionally. are input ports Ila, 12a and discharge ports Ilb, 12, respectively.
b is provided. In this embodiment, assuming that the vicinity of the outer peripheral side of the iron core 7 is most likely to generate heat due to the winding 8, the first
゜2 cooling passages h, 12 are formed.

The input port 11a of the first cooling passage 11 is connected to the connection hole 9a, and the discharge port +-1 of the first cooling passage 11 is connected to the connection hole 9a.
b is connected to the connection hole 9b.

Furthermore, the inlet port 1-12a of the second cooling passage 12 is connected to the connection hole 10a, and the discharge port 12b of the second cooling passage 12 is connected to the connection hole 10b.

Next, the configuration of the iron core 7 will be described in detail. In addition, the first
The positional relationship in the figure is defined using the steel plate 13a as an example.The right side indicates the direction of arrow A, the left side indicates the direction of arrow B, the front side indicates the direction of arrow C, and the back side indicates the direction of arrow D. shall be taken as a thing.

The iron core 7 is composed of steel plates 13a to 13h divided into a plurality of (eight in this embodiment) steel plates.

A pair of base holes 14b~], 4h, 15b~15h are provided through the steel plates], 3b~131], and a jig is inserted into these reference holes 14b~14h, 15b~151]. Insert the first and second cooling passages +1. , 1.2, and the first and second cooling passages h, 12.
It is also part of. The reference hole 151] is the above-mentioned filling capo-t-], 1. a, and the reference hole 141] becomes the discharge port 121].

Said steel plate], 3 b to 131], steel plate 1.3b,
13d, ], 3f are transparently provided with holes 161), 16d, ]6f along the left side and front side thereof; It is formed in the shape of

The steel plates 13c, 13e, and 13g are provided with holes 16c, 16e, and 16g along the right side and back side thereof, and these holes 16c, ]-6e.

16g is also formed in a planar shape.

One end of the hole 1.6 b of the steel plate 1.3 b is the base hole 15
hole in the steel plate 13c]
, 6c are in communication with the reference hole 14c. A connecting hole 17c connecting the other ends of the holes 16b and 16d is transparently provided on the left back side of the steel plate], 3c.

And the steel plate], on the right front of 3d is the steel plate 13C9.
A connecting hole 1.7 d connecting the other ends of the holes 13d and 13e ]-6c, ] and 6e is provided in the right front of the steel plate 13e. A connecting hole 17e is provided transparently. Also,
On the left rear surface of the steel plate 13f, there is a connecting hole 17f that connects one end of the holes 16e and 16g in the steel plates 13e and 13g.
is transparent.

Furthermore, the other end of the hole 16f in the steel plate 13f and the discharge port 11b of the steel plate 131] are provided on the left rear surface of the steel plate 13g.
A connecting hole 17g is transparently provided to connect the connecting hole 171]. A connecting hole 181 which serves as the inlet J ports 1-] and 2a is transparently provided on the right front surface of the steel plate 131].

These steel plates 1.3a to 1311 are joined by diffusion bonding to form the first and second cooling passages h and 12.

Next, the operation and effect of the electromagnetic chuck configured as described below will be explained.

First, when the electromagnetic chuck 2 fixed on the movable table 1 of the grinding machine is turned on by a switch (not shown) and the electromagnet 6 is energized, the workpiece W is placed on the suction surface 5a of the suction cup 5.
is fixed by suction. In this state, the workpiece W is ground. When the electromagnet 6 is demagnetized, the work W is no longer attracted to the attraction surface 5a.

Further, the winding 8 in the storage recess 4 generates heat, and heat is generated in the iron core 7. This heat is forcedly cooled as follows.

As shown in FIGS. 1 and 3, a temperature-controlled coolant 19a, 19b such as oil or the like is injected into the connection holes 9a, 10a formed in the mounting plate 3. Then, the cooling NA' 19 a flows through the first cooling passage 11 . That is, the coolant], 9a rises through the reference holes 15b-15h of the steel plates 13b-13g via the input port 11a. This coolant 19 is connected to the hole 16b1 connecting hole L7c,
Hole 16d, connecting hole 17e, hole 16f, connecting hole 1.7 g
, flows out into the connection hole 9b via the discharge port 11b.

On the other hand, the coolant 19b injected into the connection hole 10a flows through the second cooling passage 12. In other words, the coolant 19b is in the hole 16g.
It flows through the 1 connection hole 17f1 hole 16e, the connection hole 17d, and the hole 16c. This coolant 19b is inserted into the reference hole 1.4c.
~14g1 flows out into the connection hole 10b via the discharge port 12b.

As a result, the coolants 19a and 19b are the first and second cooling passages]
, 1.12 to cool the inside of the iron core 7, heat generation in the iron core 7 can be suppressed. Therefore, the heat of the iron core 7 is transmitted to the suction cup 5, and the suction cup 5 can be prevented from being bent by the heat. Therefore, work W
The cutting accuracy can be stabilized.

Further, since the electromagnetic chuck 2 can be cooled not from the outside but from inside the iron core 7, which is a heat source, cooling can be performed efficiently.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified as follows without departing from the spirit of the present invention.

(1) In this embodiment, an electromagnetic chuck is used, but it can also be applied to a work table, a support frame that rotatably supports the spindle of a grinding wheel in a grinding machine, and the like.

(2) In this embodiment, the second cooling passage 11°12
Although the cooling passages h and 12 are formed regularly, it is also possible to determine how the iron core 7 generates heat through computer simulation, etc., and form the cooling passages h and 12 discontinuously, that is, to maximize internal cooling efficiency, depending on the temperature distribution. It is.

(3) In addition, in this example, the steel plate was bonded by diffusion bonding]
, 3a~], and 3h are bonded together, but it is also possible to bond them together with an adhesive or the like.

(4) Furthermore, it is also possible to form the iron core 7 by pressurizing the pins after inserting them into the steel plates 13a to 13h.

[Effects of the Invention] As described in detail above, the present invention has the effect of improving cooling efficiency and stabilizing the grinding accuracy of a workpiece.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a state before joining steel plates, FIG. 2 is a partially cutaway perspective view showing the structure of an electromagnetic chuck, and FIG. 3 is a sectional view of the electromagnetic chuck. 7... Iron core as a heating element, h, 12... 1st °2
Cooling passage, 13a to 13h... Steel plate as plate, 14
b~], 4h, 15b~], 5h...Reference hole as hole, 16b~16h...hole, 1.7c~17h
,]8h...Connecting hole as a hole,],9a,19b・
・Coolant. 931.48(5)

Claims (1)

[Claims] 1. The heating element (7) in the machine tool or the heated element disposed adjacent to the heating element is divided into a plurality of plates (13a to 13h), and the plurality of plates (13a to 13h)
are provided with holes (14b to 14b) having a predetermined shape so as to increase the cooling efficiency based on the temperature distribution of the heating element (7) or the heated element.
14h, 15b-15h, 16b-16h, 17c-1
7h, 18h) or grooves, and the plurality of plates (1
3a to 13h), the holes (14b to 14h, 15b to 15h, 16b to 16h,
17c to 17h, 18h) or cooling passages (
11, 12), and a cooling material (19a, 19b) is allowed to flow through the cooling passage (11, 12).