Grinding Machine

Abstract

To provide a machine tool capable of improving the machining accuracy of a workpiece by suppressing the thermal expansion of a tool spindle due to the heating of a tool spindle motor and preventing the thermal displacement of the tool spindle, and capable of preventing the failure of a grinding wheel shaft motor and the like due to smudging of the grinding wheel shaft motor or the belt or the slipping of the belt.SOLUTION: An NC grinder 1 applying a machine tool is equipped with a grinding wheel shaft 14, a grinding wheel shaft motor 15, and a whole cover 20 that covers the grinding wheel shaft 14 and the grinding wheel shaft motor 15. The grinding shaft motor 15 is covered by a motor cover 2, and the motor cover 2 is provided with an intake port 3 and an exhaust port 4 communicating the inside and outside of the motor cover 2. The intake port 3 of the motor cover 2 and the outside of the whole cover 20 are communicated by an intake duct 5, and the exhaust port 4 of the motor cover 2 and the outside of the whole cover 20 are communicated by an exhaust duct 6.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This invention is used, for example, as an NC grinding machine. Grinding Machine Regarding. [Background technology]

[0002] For example, as shown in FIG. 6 and FIG. 7, an NC grinding machine 10 includes a bed 11, a wheel head 12 arranged on the bed 11, and a rotatable wheel shaft provided on the wheel head 12 and holding a wheel 13 at its tip. 14 and Known examples of such a grinding machine include a grinding wheel spindle motor 15 (tool spindle motor) that rotates the grinding wheel spindle 14, a table 16 arranged on the bed 11 so as to be freely movable in the Z-axis direction, a work spindle head 17 arranged on the table 16 and holding one end of the workpiece W, a tailstock 18 arranged on the table 16 and holding the other end of the workpiece W, a grinding fluid supplying device 19 that supplies grinding fluid when the workpiece W is machined, and an overall cover 20 that covers the grinding wheel head 12, grinding wheel spindle 14, grinding wheel spindle motor 15, table 16, work spindle head 17, tailstock 18 and grinding fluid supplying device 19.

[0003] In the above-mentioned NC grinding machine 10, the grinding wheel spindle motor 15 is a motor that rotates the grinding wheel spindle 14 via a pulley 21 attached to one end of the output shaft 151, a pulley 22 attached to the grinding wheel spindle 14, and a belt 23 wound around both pulleys 21, 22, and is generally attached to the back of the grinding wheel spindle 14 via a motor base 24 on the wheel head 12. A motor equipped with a self-ventilating cooling fan 25 that is rotated by the rotation of the output shaft 151 is generally used as the grinding wheel spindle motor 15, but this grinding wheel spindle motor 15 has the following problems. a. Heat generated by the grinding wheel spindle motor 15 is released by the motor cooling fan 25, so that the grinding wheel head 12 becomes warm and expands thermally. As a result, the grinding wheel spindle 14 is thermally displaced, which affects the dimensional accuracy of the workpiece W. b. The motor cooling fan 25 of the grinding wheel spindle motor 15 blows grinding fluid mist containing grinding chips around the grinding wheel spindle motor 15, which causes the grinding wheel spindle motor 15, belt 23, etc. to become dirty, which can lead to malfunction of the grinding wheel spindle motor 15, etc., or slippage of the belt 23.

[0004] In particular, the NC grinding machine is equipped with an overall cover 20 that covers the entire machine to prevent scattering of the grinding wheel 13 when it breaks, to prevent coolant from scattering, and to prevent pinching by moving parts. In this case, the overall cover 20 creates an enclosed space, and the effects of a and b above become more pronounced.

[0005] For example, in a machine tool that supports a spindle head body that moves up and down on the front of a column, has a spindle drive motor fixed to the spindle head body, and is equipped with a spindle head cover that covers the spindle drive motor and the spindle head body for the purpose of dust prevention, etc., an exhaust duct is attached to the spindle drive motor to prevent thermal displacement of the spindle head when the spindle drive motor is operating, the inlet of the exhaust duct is connected to an exhaust port formed at the rear end of the spindle drive motor, and the outlet of the exhaust duct opens to the outside of the spindle head cover (see Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 2-35660 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the NC grinding machine 10 shown in Figures 6 and 7, even if, based on the machine tool described in Patent Document 1, the grinding wheel spindle motor 15 is covered with a motor cover, an exhaust duct is attached to the motor cover, the inlet of the exhaust duct is connected to an exhaust port formed in the motor cover of the grinding wheel spindle motor 15, and the outlet of the exhaust duct is opened to the outside of the overall cover 20, the above problem b cannot be solved and it is not possible to prevent breakdowns of the grinding wheel spindle motor 15, etc. or slippage of the belt caused by dirt on the grinding wheel spindle motor 15, belt, etc.

[0008] The object of the present invention is to solve the above problems, Grindstone spindle Suppresses thermal expansion of the grinding wheel head caused by heat generated by the motor. Grindstone spindle By preventing the thermal displacement of the workpiece, the machining accuracy of the workpiece can be improved. Furthermore, the grindstone Prevents breakdown of the grinding wheel spindle motor and belt slippage caused by dirt on the spindle motor and belt. Grinding Machine The purpose of this invention is to provide [Means for solving the problem]

[0009] In order to achieve the above object, the present invention comprises the following aspects.

[0010] 1) a bed; a table disposed on the bed; a work headstock disposed on the table and holding one end of a workpiece; a tailstock disposed on the table and holding the other end of the workpiece; a wheel head disposed on the bed; At the tip Grindstone Hold Freely rotatable grinding wheel spindle And the above Grindstone spindle Rotate Grindstone spindle A motor; a grindstone spindle side pulley attached to an end of the grindstone spindle opposite to the side where the grindstone is held; a motor side pulley attached to one end of a motor output shaft of the grindstone spindle motor; a belt that is hung on the grindstone spindle side pulley and the motor side pulley and transmits the rotation of the motor output shaft of the grindstone spindle motor to the grindstone spindle side pulley; the grindstone head, the grindstone spindle, the grindstone spindle motor, the table, the work headstock, and the tailstock. and a whole cover that covers the Grinding Machine In The above Grindstone spindle The motor is covered by a motor cover, and the motor cover is provided with an intake port and an exhaust port that communicate between the inside and outside of the motor cover, the intake port of the motor cover and the outside of the overall cover are communicated by an intake duct, and the exhaust port of the motor cover and the outside of the overall cover are communicated by an exhaust duct. The wheel spindle pulley, the motor pulley and the belt are disposed in the overall cover outside the intake duct and the exhaust duct. There are Grinding Machine .

[0011] 2) The above Grindstone spindleA motor is provided in the motor cover. The above The motor includes a self-cooling motor having a cooling fan that rotates with the rotation of the motor output shaft, and the rotation of the cooling fan causes air outside the entire cover to flow through the intake duct and the intake port. Grindstone spindle The air is fed into the motor cover of the motor and exhausted to the outside of the overall cover through the exhaust port and the exhaust duct. Grinding Machine .

[0012] 3) Within the motor cover Grindstone spindle A heat dissipation fin is provided around the motor, and the cooling fan is covered by a cooling fan cover provided inside the motor cover. One end of the cooling fan cover is connected to the intake port. cover The other end of Grindstone spindle The cooling fan is opened toward the motor and the heat dissipation fins, and when the cooling fan rotates, the air outside the entire cover passes through the intake duct and the intake port and enters the cooling fan cover, and is circulated through the heat dissipation fins. Grindstone spindle The exhaust device according to claim 2) above, in which after removing heat from the motor, the heat is exhausted to the outside of the whole cover through the exhaust port and the exhaust duct. Grinding Machine .

[0013] 4) The above A grinding wheel spindle motor is fixed to the grinding wheel head via a base, and a cooling fluid passage is formed in the base. Any of the above 1) to 3) Described Grinding Machine . Effect of the Invention

[0014] 1) above~ 4) Grinding machine According to the paper, the air outside the entire cover is taken into the motor cover through the intake duct and the intake port. Grindstone spindle Cool the motor, Grindstone spindle After cooling the motor, the hot air can be exhausted to the outside of the overall cover through the exhaust port and the exhaust duct. Grindstone spindle Due to motor heat Grindstone spindleThe thermal expansion of the Grindstone spindle This makes it possible to prevent thermal displacement of the workpiece, thereby improving the machining accuracy of the workpiece.

[0015] Moreover, the above 1) to 4) According to the grinding machine By preventing the air taken into the motor cover from containing grinding fluid mist and the like, it is possible to prevent breakdowns of the grinding wheel spindle motor and the like and slippage of the belt caused by dirt on the grinding wheel spindle motor and the belt, etc.

[0016] 2) above Grinding Machine According to the company, the rotation of the cooling fan draws air outside the entire cover through the intake duct and the intake port. Grindstone spindle The air is sent into the motor cover of the motor. Grindstone spindle As the motor cools, Grindstone spindle Due to motor heat Grindstone spindle The thermal displacement of the Grindstone spindle The air that has cooled the motor and become hot is exhausted to the outside of the overall cover through an exhaust port and an exhaust duct.

[0017] 3) above Grinding Machine According to the report, when the cooling fan rotates, the air outside the entire cover passes through the intake duct and the intake port, enters the cooling fan cover, and is radiated through the heat dissipation fins. Grindstone spindle After removing heat from the motor, the heat is exhausted to the outside of the overall cover through the exhaust port and exhaust duct. Grindstone spindle The motor can be cooled efficiently.

[0018] the above 4) Grinding machine According to the present invention, by flowing the cooling fluid through the cooling fluid passage of the base, the heat generated by the grinding wheel spindle motor during operation is prevented from being transmitted to the grinding wheel head. Therefore, the thermal expansion of the grinding wheel head due to the heat generated by the grinding wheel spindle motor can be suppressed. Grindstone spindle This makes it possible to prevent thermal displacement of the workpiece, thereby improving the machining accuracy of the workpiece. [Brief description of the drawings]

[0019] [Figure 1] 1 is a schematic plan view showing a first embodiment of a grinding machine according to the present invention. [Diagram 2] FIG. 2 is a schematic side view showing the grinding machine of FIG. [Diagram 3] FIG. 2 is a partially enlarged view of FIG. [Figure 4] FIG. 4 is a schematic plan view showing a second embodiment of a grinding machine according to the present invention. [Diagram 5] FIG. 5 is a schematic side view showing the grinding machine of FIG. 4. [Figure 6] FIG. 1 is a schematic plan view showing a conventional grinding machine. [Figure 7] FIG. 7 is a schematic side view showing the grinding machine of FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A first embodiment of the present invention will now be described with reference to the drawings.

[0021] 1 and 2 are according to the present invention. Grinding Machine FIG. 3 shows a schematic overall configuration of a first embodiment of an NC grinding machine to which the present invention is applied, and FIG.

[0022] In the following description, the same elements and portions as those shown in FIGS. 6 and 7 are designated by the same reference numerals and description thereof will be omitted.

[0023] The grinding wheel spindle motor of the NC grinding machine 1 shown in Fig. 1 and Fig. 2 15 is 1, and is covered by the motor cover 2 within the overall cover 20. The motor cover 2 is provided with an intake port 3 and an exhaust port 4 that communicate the inside and outside of the motor cover 2, and the intake port 3 of the motor cover 2 and the outside of the overall cover 20 are communicated by an intake duct 5, and the exhaust port 4 of the motor cover 2 and the outside of the overall cover 20 are communicated by an exhaust duct 6. The intake duct 5 and the exhaust duct 6 are adapted to expand and contract when the grinding wheel head 12 moves in the front-to-rear direction (X-axis direction). The connection between the motor cover 2 and the intake duct 5 and the exhaust duct 6 is airtight, so that the air inside the motor cover 2 does not leak.

[0024] As shown in FIG. 3, a plurality of heat dissipation fins 7 are provided at intervals around the grinding wheel spindle motor 15 inside the motor cover 2. The end face of the grinding wheel spindle motor 15 on the pulley 21 side is in contact with the inner surface of the motor cover 2. The cooling fan 25 is provided on the opposite side of the end face of the grinding wheel spindle motor 15 on the pulley 21 side, and is covered by a cooling fan cover 8 provided on the inner side of the motor cover 2. The left end of the cooling fan cover 8 leads to the air intake 3. The right end of the cooling fan cover 8 opens toward the grinding wheel spindle motor 15 and the heat dissipation fin 7, and the heat dissipation fin 7 is located within the range of the right end opening of the cooling fan 25 when viewed from the right side. The air sent by the cooling fan 25 hits the grinding wheel spindle motor 15 and all the heat dissipation fins 7. As the cooling fan 25 rotates, the air outside the whole cover 20 passes through the intake duct 5 and the intake port 3 and enters the cooling fan cover 8, and then, after removing heat from the grinding wheel spindle motor 15 via the heat dissipation fins 7, it is exhausted through the exhaust port 4 and The air is then exhausted through the exhaust duct 6 to the outside of the overall cover 20 .

[0025] In addition, a cooling fluid passage 9 is formed in a base 24 that fixes the grinding wheel spindle motor 15 to the wheel head 12. A cooling fluid flows through the cooling fluid passage 9 of the base 24, so that the heat generated from the grinding wheel spindle motor 15 is prevented from being transmitted to the wheel head 12.

[0026] In the above-mentioned NC grinding machine 1, when the output shaft 151 of the grinding wheel spindle motor 15 rotates during operation of the NC grinding machine 1, the cooling fan 25 rotates together with the rotation, and the air outside the overall cover 20 passes through the intake duct 5 and the intake port 3 and enters the cooling fan cover 8, then removes heat from the grinding wheel spindle motor 15 via the heat dissipation fins 7, and is then exhausted to the outside of the overall cover 20 through the exhaust port 4 and the exhaust duct 6. Therefore, the thermal expansion of the grinding wheel head 12 due to heat generated by the grinding wheel spindle motor 15 can be suppressed, and the thermal displacement of the grinding wheel spindle 14 can be prevented, thereby improving the machining accuracy of the workpiece W.

[0027] Furthermore, since the air sucked in by the cooling fan 25 does not contain grinding fluid mist or the like, it is possible to prevent malfunction of the grinding wheel spindle motor 15 and the like and slippage of the belt caused by dirt on the grinding wheel spindle motor 15, belt, etc.

[0028] 4 and 5 are diagrams showing the configuration of the present invention. Grinding Machine 1 and 2 are given the same reference numerals and descriptions thereof will be omitted.

[0029] The NC grinding machine 30 shown in Figs. 4 and 5 differs from the NC grinding machine 1 shown in Figs. 1 and 2 in that the saddle 31 on which the wheel head 12 and the wheel spindle motor 15 are placed moves in the Z-axis direction instead of the table 16. In this case, the intake duct 5 and the exhaust duct 6 also move in the Z-axis direction, so that the ducts 5 and 6 cannot be fixed to the overall cover 32 as in the NC grinding machine 1 shown in Figs. 1 and 2. For this reason, in this second embodiment, the entire rear side of the overall cover 32 is opened, and the intake duct 5 is formed to also function as the wheel head cover 33 that surrounds the entire wheel head 12, and further the motor cover 2 and the exhaust duct 6 are arranged inside the wheel head cover 33. And, bellows 34 are provided between the left and right side edges of the rear side opening of the overall cover 32 and the left and right side surfaces of the wheel head cover 33 to prevent the grinding fluid mist and the like from leaking out of the machine.

[0030] With this configuration, even in an NC grinding machine 30 in which the wheel head 12 moves in the Z-axis direction, it is possible to suppress thermal expansion of the grinding wheel spindle 14 due to heat generated by the grinding wheel spindle motor 15, as in the NC grinding machine 1 of the first embodiment, and it is possible to prevent thermal displacement of the grinding wheel spindle 14 and improve the machining accuracy of the workpiece W. Moreover, since the air sucked in by the cooling fan 25 does not contain grinding fluid mist or the like, it is possible to prevent breakdowns of the grinding wheel spindle motor 15, etc., and slippage of the belt caused by dirt on the grinding wheel spindle motor 15, belt, etc.

[0031] In the above two embodiments, Grinding Machine is applied to NC grinding machines, but is not limited to this and can be used in normal grinding machines. Also on the board is applicable. [Industrial Applicability]

[0032] According to this invention Grinding machines, for example, are NC It is suitable for use as a grinding machine. [Explanation of symbols]

[0033] 1: NC grinding machine, 2: motor cover, 3: intake port, 4: exhaust port, 5: intake duct, 6: exhaust duct, 7: heat dissipation fin, 8: cooling fan cover, 9: cooling fluid passage, 11: bed, 12: grinding wheel stand, 13: grinding wheel, 14: grinding wheel shaft, 15: Grindstone shaft motor Ta, 16: Table, 17: Work head, 18: Tailstock, 20: Overall cover, 24: Base, 25: Cooling fan, 30: NC grinding machine, 31: Saddle, 32: Overall cover, 33: Grinding wheel head cover, 34: Bellows

Claims

1. A grinding machine comprising: a bed, a table arranged on said bed, a work spindle head arranged on said table and holding one end of a workpiece, a tailstock arranged on said table and holding the other end of the workpiece, a grinding wheel head arranged on said bed, a rotatable grinding wheel spindle provided on said grinding wheel head and holding a grinding wheel at its tip, a grinding wheel spindle motor for rotating said grinding wheel spindle, a grinding wheel spindle side pulley attached to an end of said grinding wheel spindle opposite to the end where the grinding wheel is held, a motor side pulley attached to one end of a motor output shaft of said grinding wheel spindle motor, a belt hung on said grinding wheel spindle side pulley and said motor side pulley and transmitting the rotation of the motor output shaft of said grinding wheel spindle motor to said grinding wheel spindle side pulley, and an overall cover which covers said grinding wheel head, said grinding wheel spindle, said grinding wheel spindle motor, said table, said work spindle head and said tailstock, a grinding machine in which the grinding wheel spindle motor is covered by a motor cover, the motor cover is provided with an intake port and an exhaust port that connect the inside and outside of the motor cover, the intake port of the motor cover is connected to the outside of the overall cover by an intake duct, the exhaust port of the motor cover is connected to the outside of the overall cover by an exhaust duct, and the grinding wheel spindle side pulley, the motor side pulley and the belt are arranged within the overall cover outside the intake duct and the exhaust duct.

2. 2. The grinding machine according to claim 1, wherein the grinding wheel spindle motor is a self-cooled motor having a cooling fan provided inside the motor cover and rotated by rotation of the motor output shaft, and the rotation of the cooling fan causes air outside the overall cover to be sent through the intake duct and the intake port into the motor cover of the grinding wheel spindle motor, and is exhausted to the outside of the overall cover through the exhaust port and the exhaust duct.

3. 3. The grinding machine according to claim 2, wherein heat dissipation fins are provided around the grinding wheel spindle motor within the motor cover, the cooling fan is covered by a cooling fan cover provided within the motor cover, one end of the cooling fan cover communicates with the intake port and the other end of the cooling fan cover opens toward the grinding wheel spindle motor and the heat dissipation fins, and when the cooling fan rotates, air outside the overall cover passes through the intake duct and the intake port into the cooling fan cover, removes heat from the grinding wheel spindle motor via the heat dissipation fins, and is then exhausted to the outside of the overall cover through the exhaust port and the exhaust duct.

4. A grinding machine described in any of claims 1 to 3, wherein the grinding wheel spindle motor is fixed to the grinding wheel head via a base, and a cooling fluid passage is formed in the base.

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