JP2008119797A - Surface grinding machine - Google Patents

Abstract

The present invention provides a grinding fluid supply system and a work table of a grinding apparatus for improving the dimensional accuracy of a workpiece to be ground.
A grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in a left-right direction with a grinding wheel 3 that rotates, the work table comprising: A grinding fluid guide plate is provided at a position 1 to 5 mm lower than the work table upper surface position on the right side surface and the front and rear surfaces of the work table, and the work surface is in contact with the grinding wheel on the right side of the grinding wheel. A grinding fluid supply nozzle 18 is provided for ejecting the grinding fluid toward the right side. A plurality of grinding fluid ejection holes are formed in the bottom portion 251 on the right surface side of the grinding fluid supply nozzle, and the work table is inverted and reciprocated in the left and right directions. A surface grinding apparatus provided with a three-way jet supply nozzle 25 having a grinding liquid right jet port 252 and a left jet port 253 on the side surface of the nozzle.
[Selection] Figure 3

Description

The present invention relates to a grinding apparatus that performs surface grinding (including molding grinding and groove grinding) on the surface of a workpiece such as an automobile part, an electric / electronic device part, a mold member, or the like. If the workpiece is ground using the grinding device of the present invention, the temperature change of the electromagnetic chuck provided on the workpiece table of the grinding device and the workpiece placed on the electromagnetic chuck can be managed minutely, and the dimensional accuracy is excellent. A ground workpiece can be obtained.

2. Description of the Related Art A grinding device that performs grinding with a grinding wheel that rotates the surface of a workpiece placed on an electromagnetic chuck provided on a work table that can reciprocate in the left-right direction has been put to practical use as a surface grinding device. In the case of workpiece surface grinding, the workpiece surface is ground by relative movement of the workpiece and grinding wheel. At this time, the grinding liquid is ejected from the grinding liquid supply nozzle installed on the side surface of the grinding wheel toward the point of contact between the workpiece surface and the grinding wheel, thereby cooling the workpiece and the electromagnetic chuck.

In surface grinding of a workpiece, various temperature control mechanisms are provided on a workpiece table, a column, an electromagnetic chuck, and the like of a surface grinding apparatus member in order to prevent warpage and dent due to thermal distortion of the workpiece subjected to grinding.

For example, even when the work table arranged below the grinding wheel moves and the electromagnetic chuck placed on the work table is retracted or stands by at a position away from the grinding wheel, grinding water (grinding) A cooling water nozzle head that continuously cools the electromagnetic chuck and a nozzle head that cools the workpiece are provided along the electromagnetic chuck separately from the grinding fluid supply nozzle of the liquid), and cooling is performed from a number of injection holes arranged in this nozzle head. This is a method in which water is bathed in a wide area of the electromagnetic chuck and the electromagnetic chuck is kept within a certain temperature range to prevent thermal expansion and contraction of the electromagnetic chuck and perform grinding with high accuracy (for example, refer to Patent Document 1).

In addition, a work table that can be moved back and forth in the left-right direction is provided on the bed, and the work is placed on the work table, and a grinding wheel that rotates around the wheel axis is provided in a column that can move in the vertical direction or the front-rear direction. Using the disc, the grinding fluid is supplied from the nozzle provided in the vicinity of the grinding wheel to the workpiece, while grinding the workpiece with the grinding stone, on both sides of the column of the grinding machine, in the vertical and longitudinal feed screws, in the grinding wheel head One thermistor T ₁ connected to the controller of the lubricating oil temperature controller, which is a method for managing the temperature of the lubricating oil circulated around the main shaft and for cooling the inside of the bed frame by the lubricating oil temperature regulator. embedding the column wall, the other thermistor T ₂ is placed in the oil reservoir of the column top, to follow the temperature detected by the thermistor T ₂ to the temperature detected by the thermistor T ₁ The temperature of the lubricating oil in the grinding device is characterized by returning the lubricating oil circulating in the tank of the lubricating oil temperature regulator, heating or cooling the lubricating oil in this tank, and returning the lubricating oil to the grinding machine A management method has also been proposed (see, for example, Patent Document 2).

Furthermore, using the grinding device, the grinding fluid used to grind the workpiece with the grinding wheel while supplying the grinding fluid from the nozzle to the workpiece is returned to the tank, and the temperature of the grinding fluid in the tank is adjusted by the temperature controller. The temperature is adjusted to the desired temperature, and this is circulated to the nozzle with a pump to recycle the grinding fluid. The grinding fluid is used on both sides of the column of the grinding machine, in the vertical and longitudinal feed screws, and around the spindle in the grinding wheel head. In addition, a temperature management method for a grinding apparatus that is circulated to cool the inside of the frame is also known (see, for example, Patent Document 3).

JP-A-5-277940 JP 2002-331441 A JP 2000-271866 A

The cooling method using the electromagnetic chuck in the standby position and the two cooling nozzle heads for cooling the workpiece described in Patent Document 1 separately from the grinding fluid supply nozzle cools the electromagnetic chuck portion that cannot be cooled by the grinding fluid supply nozzle alone. Therefore, it is excellent in temperature control. However, since tap water, industrial water, or the like is used as a coolant, a coolant storage tank different from the grinding fluid storage tank is required, and the installation area of the auxiliary member of the grinding device increases. Also, since both cooling nozzle heads discharge the cooling water to the electromagnetic chuck with the cooling liquid directed downward, the cooling liquid splash area is small, and cooling is performed in the part where the electromagnetic chuck is located, particularly in the vicinity of the right end of the standby position. There is a fault that does not splash water.

Further, in the positional relationship between the work table that is reversed left and right and the grinding wheel, the cooling efficiency by the grinding liquid is poor at the right side of the work table, the front side of the work table, and the rear side at the position below the center vertical axis of the grinding wheel.

In the electromagnetic chuck cooling method described in Patent Document 1 of the work table, the present inventor uses a grinding liquid as a cooling liquid so that only one grinding liquid storage tank is required, and cooling is used separately from the grinding liquid supply nozzle. Three-way jetting with holes for jetting the grinding fluid downward as a fluid supply nozzle at the bottom, and with a grinding fluid jet on the nozzle side in the two left and right directions where the work table reverses and reciprocates It has been found that the temperature management of the electromagnetic chuck can be further improved by using the supply nozzle.

Furthermore, in the positional relationship between the work table that is reversed left and right and the grinding wheel, the cooling efficiency by the grinding liquid was poor at the right side of the work table at the position below the center vertical axis of the grinding wheel, the front side of the work table, and the rear side. The present inventors have found that the work table cooling efficiency of the grinding liquid is enhanced by installing the grinding liquid guide plates on the right side surface and the front and rear surfaces of the work table.

The invention according to claim 1 is a grinding apparatus for grinding with a grinding wheel that rotates a surface of a work placed on an electromagnetic chuck provided on a work table that can reciprocate in the left-right direction, the grinding wheel Is provided with a grinding fluid supply nozzle that ejects the grinding fluid toward the point of contact between the workpiece surface and the grinding wheel, and has a plurality of grinding fluid ejection holes on the right side of the grinding fluid supply nozzle. The present invention provides a surface grinding apparatus characterized in that a three-way jetting supply nozzle having a right and left grinding liquid outlet is provided on a nozzle side surface in two right and left directions in which the work table is reversed and reciprocated. is there.

According to a second aspect of the present invention, there is provided a grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in the left-right direction with a grinding wheel that rotates. Is provided with a right side plate of the grinding fluid guide on the right side of the work table at a position 1 to 5 mm lower than the position of the upper surface of the work table, and on the front and rear surfaces of the work table at a position of 1 to 5 mm below the position of the work table A grinding fluid supply nozzle is provided on the right side of the grinding wheel for ejecting the grinding fluid toward the point of contact between the workpiece surface and the grinding wheel, and the grinding fluid is ejected to the right side of the grinding fluid supply nozzle. A three-way jet with holes on the bottom and a grinding liquid right jet and left jet on the side of the nozzle in the left and right directions where the work table is reversed and reciprocates. There is provided a surface grinding apparatus characterized in that a nozzle.

According to a third aspect of the present invention, there is provided a grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in the left-right direction with a grinding wheel that rotates. Is provided with a grinding fluid supply nozzle that ejects the grinding fluid toward the point of contact between the workpiece surface and the grinding wheel, and the workpiece table has a grinding fluid guide right plate on the right side of the workpiece table. Provided is a surface grinding apparatus characterized in that it is provided at a position 1 to 5 mm lower than the table upper surface position, and a grinding liquid guide plate is provided at a position 1 to 5 mm lower than the work table upper surface position on the front and rear surfaces of the work table. Is.

In addition to the conventional grinding fluid supply nozzle that supplies the grinding fluid toward the working point, the electromagnetic chuck in the standby position and the three-way ejection supply nozzle that supplies the cooling fluid for cooling the workpiece are provided. Since the grinding fluid is evenly supplied to the workpiece and the workpiece table, the temperature change becomes smaller.

By providing the grinding fluid guide plate on the work table, the residence time of the grinding fluid staying on this guide plate is lengthened, and the right side, front and rear sides of the work table by the grinding fluid guided to the grinding fluid guide plate The edge is cooled, and the temperature difference between the work or electromagnetic chuck and the work table can be managed smaller.

Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 is a perspective view of a surface grinding apparatus of the present invention, FIG. 2 is a side view of the surface grinding apparatus, FIG. 3 is a front view showing the positional relationship between a grinding wheel and a grinding fluid supply nozzle, and FIG. 4 is a grinding wheel and grinding fluid supply. FIG. 5 is a plan view showing the positional relationship between the grinding wheel and the grinding fluid supply nozzle, FIG. 6 is a plan view of the work table, FIG. 7 is a front view of the work table, and FIG. It is a side view of a table.

In the surface grinding apparatus 1 shown in FIGS. 1 and 2, 2 is a workpiece, 3 is a grinding wheel, 4 is a sliding table capable of reciprocating in the left-right direction (X-axis direction), 5 is a work table, and 6 is an electromagnetic chuck. , 7 is a saddle capable of reciprocating in the front-rear direction (Z-axis direction), 8 is an operation panel, 8b is a manual pulse generator button for turning the wheel up and down, 9 is a column, 10 is a wheel head, 11 is a wheel shaft, Lifting mechanism for moving the grinding wheel in the vertical direction (Y-axis direction), 13 is a motor, 14 is a screwed body, 15 is a screw shaft, 16 is a bearing, 17 is a grinding wheel protective cover, 18 is a grinding fluid supply nozzle, 19 is A bed, 20 is a tank, 21 is a filter, 22 is a pump, 24 is a control unit, 25 is a three-way ejection supply nozzle, and 26 is a grindstone shaft rotation motor.

An electromagnetic chuck 6 is placed on the work table 4, a work to be processed is placed thereon, the rotating grinding wheel 3 contacts the work surface, and the work surface is ground. During processing, the work table 4 on which the work is placed moves in the left-right direction, and the saddle 7 moves in the front-rear direction.

As the chuck when the workpiece is made of metal, the electromagnetic chuck 6 is generally used. When the workpiece is non-metallic, a template or a jig for fixing the workpiece on the table is used. Such an electromagnetic chuck uses, for example, a principle in which a current is passed through a coil wound around a magnetic pole steel material and the current is cut off to eliminate the magnetic force, and a number of electromagnets are alternately arranged with S and N poles. A square table type chuck that is lined up and surrounded by a non-magnetic material, and a coil wound around magnetic pole steel in a cast iron bottom box, and the upper part of the bottom box is separated by a U-shaped insulating separator and insulated A structure in which the material is in contact with the S and N poles of the electromagnet and covered with an upper lid that forms each magnetic pole, and a coil wound around a permanent magnet or magnetic steel for a magnetic pole is arranged in the bottom box of cast iron. A structure in which the upper part of the box is covered with an upper lid that forms a flat holding surface with a magnetic member embedded in a part of the upper surface of the face plate through a partition plate made of a non-magnetic material can be used.

These electromagnetic chucks 6 are used by being fixed to a mounting base provided on the stainless steel work table 4. Further, since the electromagnet of the electromagnetic chuck 6 is used with a direct current, a metal machine tool is usually provided with a rectifier that uses alternating current as a direct current.

When fixing the work to the electromagnetic chuck 6, if the coil arranged inside the bottom box body is energized, or the permanent magnet is moved from the outside to the operating position, the magnetic pole members are alternately N poles and S poles, The work is firmly adsorbed and fixed by magnetic force. When the work is finished, the coil is turned off or the permanent magnet is moved to release the magnetic force.

The grinding fluid supply nozzle 18 is provided on the right side surface of the grinding wheel protection cover 17 that protects the grinding wheel 3, and the grinding fluid supplied to the supply pipe 18 a by the pump from the grinding fluid storage tank (not shown) is sprayed to the working point. . On the right surface side of the grinding fluid supply nozzle 18, a plurality of grinding fluid ejection holes 251 are bored at the bottom, and the grinding fluid right ejection port 252 and the left are formed on the nozzle side surface in the left and right directions in which the work table is reversed and reciprocates. A three-way jet supply nozzle 25 having a jet outlet 253 is provided. Grinding fluid supplied by a pump from the grinding fluid storage tank (not shown) is supplied to the grinding fluid three-way ejection supply nozzle 25 via the branch pipe and is then ejected from the three-way ejection supply nozzle 25. Cools the right end of the electromagnetic chuck 6 or the work table 4.

The grinding wheel 3 is rotatably attached to a grinding wheel shaft 11 provided on the grinding wheel head 10 through a flange so that the radial direction thereof is in the horizontal direction of the work table 4 and the width direction thereof is in the longitudinal direction of the work table 4. . The grindstone shaft 11 is attached to an elevating mechanism 12 that moves in a vertical direction (Y-axis direction) to a column 9 provided on a bed 19, and the screw 14 rotates the screw shaft 15 when the screw 14 rotates the motor 13. It can be moved up and down. Reference numeral 16 denotes a bearing. The grinding wheel 3 is rotated by rotationally driving the grinding wheel shaft 11 by a motor 26.

The work table 4 is moved in the left-right direction by a linear motor and a ball screw, a ball screw and a servo motor, or a hydraulic cylinder (not shown).

The work table 4 is provided with grinding fluid guide plates 41, 42, 43 on the right side surface and the front and rear surfaces of the work table at positions 1 to 5 mm lower than the work table upper surface position. The grinding fluid guide right side plate 41 retains the grinding fluid supplied from the grinding fluid supply nozzle 18 or the left outlet 253 of the three-way ejection supply nozzle 25 on the guide plate, and suppresses the temperature rise of the work table 4 due to the generation of processing heat. To do. The width of the grinding fluid guide right side plate 41 is such that the grinding fluid supply nozzle 18 or the three-way ejection supply nozzle 25 is left when the grinding wheel 3 is in the standby position or when the work table 4 advances to the left and reverses to the right. A width of 30 to 100 mm is sufficient for the grinding fluid supplied from the jet port 253 to reach and stay on the surface of the right guide plate 41. The surface of the grinding fluid guide right side plate 41 is provided at a position 1 to 5 mm lower than the work table upper surface position. The width of the guide front side plate 42 and the guide rear side plate 43 is sufficient to be 1/2 to 1 times the width of the grinding wheel 3. The surfaces of the grinding fluid guide front side plate 42 and the grinding fluid guide rear side plate 43 are provided at a position lower by 1 to 5 mm, preferably 2 to 3 mm than the work table upper surface position. Stainless steel is preferred as the material for the grinding fluid guide plates 41, 42, 43.

The grinding apparatus of the present invention can be assembled by attaching a new three-way ejection supply nozzle 25 to a commercially available surface grinding apparatus and attaching grinding fluid guide plates 41, 42, 43 to the work table 4.

The metal workpiece is ground through the following steps. The grinding wheel 3 is attached to the grinding wheel shaft 11 of the grinding device, the electromagnetic chuck 6 is placed on the work table 4, and the work 2 is fixed thereon.

Before starting workpiece grinding, the operation panel 8 is turned on, processing software is selected while looking at the operation panel, and processing conditions are input.

Press the grinding machine start button to start grinding the workpiece. The work is ground by the relative movement of the work table 4 that is reversed left and right, the vertical movement of the grindstone shaft 11 and the back and forth movement. During the grinding process, the grinding fluid supplied to the supply pipe 18a by a pump from a grinding fluid storage tank (not shown) is sprayed from the grinding fluid supply nozzle 18 to the working point. In addition, the grinding fluid supplied by the pump from the grinding fluid storage tank is supplied to the grinding fluid three-way ejection supply nozzle 25 via the branch pipe, and the grinding fluid ejected from the three-direction ejection supply nozzle 25 is the electromagnetic chuck. 6 and the right end of the work table 4 are cooled.

In addition to the conventional grinding fluid supply nozzle that supplies the grinding fluid toward the working point, the electromagnetic chuck in the standby position and the three-way ejection supply nozzle that supplies the cooling fluid for cooling the workpiece are provided. Since the grinding fluid is evenly supplied to the workpiece and the workpiece table, the temperature change becomes smaller.

It is a perspective view of the surface grinding device of the present invention. It is a side view of a surface grinding apparatus. It is a front view which shows the positional relationship of a grinding wheel and a grinding fluid supply nozzle. It is a side view which shows the positional relationship of a grinding wheel and a grinding fluid supply nozzle. It is a top view which shows the positional relationship of a grinding wheel and a grinding fluid supply nozzle. It is a top view of a work table. It is a front view of a work table. It is a side view of a work table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface grinding machine 2 Workpiece 3 Grinding wheel 4 Worktable 41 Grinding fluid guide right side plate 42 Grinding fluid guide front side plate 43 Grinding fluid guide rear side plate 6 Electromagnetic chuck 7 Saddle 17 Grinding wheel protective cover 18 Grinding fluid supply nozzle 25 Three-way ejection supply nozzle

Claims (3)

A grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in a left-right direction with a grinding wheel that rotates. A grinding fluid supply nozzle that ejects the grinding fluid toward the point of contact between the grinding wheel and the grinding wheel is provided. A plurality of grinding fluid ejection holes are formed in the bottom of the right side of the grinding fluid supply nozzle, and the work table is inverted. A surface grinding apparatus comprising a three-way jet supply nozzle having a right and left grinding liquid jets on a nozzle side face in two directions of reciprocating left and right. A grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in a left-right direction with a rotating grinding wheel, wherein the work table is a right side surface of the work table. The grinding fluid guide right side plate is provided at a position 1 to 5 mm lower than the work table upper surface position, and the grinding fluid guide plate is provided at a position 1 to 5 mm lower than the work table upper surface position on the front and rear surfaces of the work table. A grinding liquid supply nozzle is provided on the right side of the vehicle to eject the grinding liquid toward the point of contact between the workpiece surface and the grinding wheel, and a plurality of grinding liquid ejection holes are formed on the right side of the grinding liquid supply nozzle at the bottom. In addition, a three-way jet supply nozzle provided with a grinding fluid right jet port and a left jet port on the nozzle side surface in two right and left directions in which the work table reverses and reciprocates is provided. Surface grinding apparatus according to claim. A grinding apparatus for grinding a surface of a work placed on an electromagnetic chuck provided on a work table capable of reciprocating in a left-right direction with a grinding wheel that rotates. A grinding fluid supply nozzle is provided for spraying the grinding fluid toward the point of contact between the grinding wheel and the grinding wheel, and the work table has a grinding fluid guide right side plate on the right side of the work table 1-5 mm from the work table top surface position. A surface grinding apparatus characterized by being provided at a low position and provided with a grinding liquid guide plate at a position 1 to 5 mm lower than a position on the work table upper surface on front and rear surfaces of the work table.

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