JP2011194552A - Compound surface grinding apparatus with workpiece support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound surface grinding apparatus, capable of reducing grinding time of a material to be ground.SOLUTION: In the compound surface grinding apparatus 1, the surface of the material to be ground mounted on a work table 31 that reciprocally moves in a right and left direction is arranged on a vertical plane including the center point 31c of the work table, a diameter direction of a first grinding wheel 26a, and a diameter direction of a second grinding wheel 26b, the grinding wheels 26a, 26b are arranged at positions where the center point 31c of the work table is at an equal distance from a center point 25a of a first grinding shaft and a center point 25b of a second grinding shaft in a waiting position when starting grinding, and a workpiece support device 33 with a work axis tilt mechanism is mounted on the work table 31. The replacement of the grinding wheels is not required so that the grinding time is reduced. A workpiece is tilted by the tilt mechanism 32, thereby enabling V-groove grinding and R surface grinding.

Description

  The present invention is a compound surface grinding with a work support device for surface grinding of a surface of an object to be ground (workpiece) such as a carbide punch, a stepped square ejector pin, a rod with a hexagon flange, a reflecting mirror of a liquid crystal display panel, a T-die, etc. Relates to the device. More specifically, rough grinding and finish grinding of an object to be ground are performed using a pair of different types of grinding wheels such as a rough grinding wheel and a finishing grinding wheel, or between a flat grinding wheel and a general grinding wheel. As described above, the present invention relates to a composite surface grinding apparatus with a dresser capable of grinding a workpiece using a pair of different types of grinding wheels to give a workpiece having excellent surface smoothness.

2. Description of the Related Art Ultra-precise micro-profile grinding apparatuses that perform profile grinding of workpieces such as carbide punches, stepped square ejector pins, hexagon flanged rods, and liquid crystal display panel reflectors are known. For example, the catalog of “Ultra-Precision Micro Profile Grinding Machine“ UPZ210L _i II / UPG310L _i ”” (Non-patent Document 1) of Okamoto Machine Tool Co., Ltd. A micro-profile grinding apparatus installed at the center near the left end of an electromagnetic chuck mounted on a table is disclosed (see FIG. 6).

Also, using a composite grinding machine equipped with a grinding wheel shaft that supports a pair of different types of grinding wheels, rough grinding and finishing are simultaneously performed on an object to be ground that is supported at both ends by one supporting device and rotating in the horizontal axis direction. Methods for grinding are known.

For example, Japanese Patent Publication No. 2002-542955 (Patent Document 1) and US Pat. No. 6,878,043 (Patent Document 2) describe an automobile clamp shaft that is an object to be ground supported between a headstock and a tailstock. For grinding, first, at least the main bearing is subjected to rough grinding using a rough grinding wheel, then the stroke bearing is subjected to finish grinding, and then the main bearing is subjected to finish grinding using the finish grinding wheel. A method for grinding the stroke bearing and the main bearing while being chucked once is proposed.

  US Pat. No. 5,484,327 (Patent Document 3) uses a rough grinding wheel shaft provided with a tilt mechanism and a finish grinding wheel shaft provided with a tilt mechanism, and these grinding wheel shafts are rotated in the horizontal axis direction. We propose a method of arranging the rotating shaft of the automotive valve, which is the material to be ground, up and down, and at the same time performing rough grinding and finish grinding of the automotive valve.

  Japanese Patent Application Laid-Open No. 2002-346889 (Patent Document 4) proposes a method of machining an annular coupling by grinding a ring-shaped workpiece mounted on a rotary table using a pair of grinding wheels.

  In the specification of Japanese Patent Application No. 2008-230387 (Patent Document 5), the applicant of this patent is mounted on a work table that can reciprocate in the left-right direction using a pair of a rough grinding wheel and a finish grinding wheel. A method was proposed for rough grinding and finish grinding of the workpieces simultaneously.

  On the other hand, a workpiece support device equipped with a tilt function that pivots the workpiece in the axial direction, which is used when grinding V-grooves, arc inclinations, hexagonal planes of flanges, and grooves of spline shafts on the workpiece with a grinding wheel, is also put into practical use. Has been. For example, a work clamp mechanism composed of a headstock and a tailstock used in a cylindrical grinding apparatus, “KCT-U water-cooled tiltable electromagnetic chuck KCT-1530UE” (trade name) shown in FIG. The magnetic chuck 64 of the tilt type rotary table 60 disclosed in Japanese Patent Laid-Open No. 2004-148431 (Patent Document 6) shown in FIG. 7b, and Japanese Patent Laid-Open No. 2004-249410 (Patent Document 7) shown in FIG. Examples thereof include the disclosed swivel mechanism 270 and the NC swivel index clamp mechanism that is listed in the center of page 2 of the catalog of Non-Patent Document 1.

Japanese Patent Publication No. 2002-542955 US Pat. No. 6,877,043 US Pat. No. 5,484,327 JP 2002-346889 A Japanese Patent Application No. 2008-230387 JP 2004-148431 A JP 2004-249410 A

Catalog issued by Okamoto Machine Tool Co., Ltd., “Ultra-Precision Micro Profile Grinding Machine UPZ210Li / UPG310Li”, May 2000, 2000 copies

Conventionally, to grind cemented carbide punches, a surface grinder (including the profile forming grinder shown in FIG. 6) is used, and the grindstone approaching the work table is manually fast-fed to automatically cut the grindstone into the workpiece. After starting, rough grinding, precision finish grinding, sparking out, stopping the work table right end, and finally performing manual fast-forwarding of the grindstone back from the work table. This grinding method has a disadvantage that the processing time is long because the precision finish grinding is performed following the rough grinding.

Moreover, conventionally, in order to grind the casting T-die of the coating machine, a surface grinding apparatus having a single grinding wheel shaft is used, and first, the T-die of the material to be ground is used using a rough grinding wheel. The T-die, which is the workpiece to be ground fixed on the work chuck table, is roughly ground by the relative movement of the grinding wheel and the work chuck table, and then the roughly ground workpiece is turned into a pitch polisher. It was transferred and finished and polished. In this conventional T-die flattening processing method, there is a drawback that it takes time to transfer the T-die of the workpiece and the processing time becomes long.

The ultra-precise micro-profile grinding machine “UPZ210LiII / UPG310Li” (trade name) disclosed in Non-Patent Document 1 is a chilled mechanism that tilts the grindstone axis 1 to 5 degrees back and forth in order to machine V-grooves and arcs on the workpiece. Was used. If the work support mechanism for tilting the work is mounted on the work table, there is no need to provide a chilled mechanism on the grindstone shaft, or there is an advantage that a more inclined V groove or round (arc) processing can be performed.

The present invention uses a composite surface grinding apparatus including a pair of grinding wheel shafts that rotatably support different grinding wheels described in Patent Document 5 on a grinding wheel shaft, and first, a workpiece support device (for example, mounted on a work table) (for example, After the workpiece (workpiece) fixed to the electromagnetic chuck) is ground by the relative movement of the work table and the first grindstone shaft, the workpiece that is the workpiece is put on another workpiece support device. Carbide punch, stepped corner ejector pin punch, electrical component die member, automotive component die member, T-die, etc. by grinding by relative movement of work table and second grinding wheel axis without shifting An object of the present invention is to provide a composite surface grinding apparatus with a workpiece support device for machining a workpiece.

The invention of claim 1
A work table that can reciprocate in the left-right direction, and a tilt that enables the work to turn about the axis in the left-right direction (X-axis direction) or the front-rear direction (Y-axis direction) of the work mounted and fixed on this work table A work stage having a mechanism, and a work stage (A) having a left-right movement mechanism for reciprocating the work table in the left-right direction,
A first tool table movable in the front-rear direction for fixing the first grinding wheel shaft for fixing the first grinding wheel for grinding the surface of the workpiece to be rotatable, and the first tool table in the front-rear direction. A first grinding stage (B ₁ ) including a back-and-forth movement mechanism for moving the first grinding wheel shaft, a lifting mechanism for the first grinding wheel shaft, and a rotation mechanism for the first grinding wheel shaft;
A second grinding wheel shaft for rotatably fixing a second grinding wheel for grinding the surface of an object to be ground is fixed in a vertical direction on a second tool table provided in parallel with the first tool table in the left-right direction. A second tool table movable in the front-rear direction, a front-rear moving mechanism for moving the second tool table in the front-rear direction, a lifting mechanism for the second grinding wheel shaft, and a rotation mechanism for the second wheel shaft Second grinding stage (B ₂ ),
Tool stage (B) with
A composite surface grinding apparatus with a workpiece support device comprising:
The center point position of the work support device at the standby position of the work table on which the work support device is mounted is the machining of the first grinding wheel in which the center point of the work support device is rotatably fixed to the first grindstone shaft. The center point in the diameter direction of the first grinding wheel at the start standby position and the center in the diameter direction of the second grinding wheel at the processing start time of the second grinding wheel rotatably fixed to the second grinding wheel shaft The workpiece is located on the same vertical plane including the point and is equidistant from the center point in the diameter direction of the first grinding wheel and the center point in the diameter direction of the second grinding wheel. A composite surface grinding apparatus with a support device is provided.

The invention according to claim 2 is provided on the work table of the work stage, provided with a rotary grinding wheel dresser installed at a rear side position of the work support device and at a substantially central portion of the work table. A composite surface grinding apparatus with a workpiece support device according to claim 1 is provided.

  The composite surface grinding apparatus with a workpiece support device of the present invention can shorten the grinding time because the workpiece can be profile-ground without replacing the grinding wheel.

  Further, even if the grindstone shaft is not equipped with a tilt mechanism, V-groove grinding, arc (round surface) machining, and hexagonal plane machining can be performed by using the workpiece shaft tilt (turning) mechanism of the workpiece support device. .

  Further, since the rotary dresser is installed at the substantially central portion on the rear side of the work table, the displacement of the rotary dresser due to the impact energy when the work table is turned to the right or to the left during dressing of the grinding wheel can be reduced. Therefore, dressing of the grinding wheel is performed with high dimensional accuracy.

FIG. 1 is a front view of the composite surface grinding apparatus. FIG. 2 is a plan view of the composite surface grinding apparatus. FIG. 3 is a side view of the composite surface grinding apparatus. FIG. 4 is a work flow diagram (front view) of a composite surface grinding apparatus with a work support device having a tilt mechanism. FIG. 5 is a block diagram of a numerical controller of the composite surface grinding apparatus. FIG. 6 is an oblique view of the ultraprecision micro-profile grinding apparatus. (Known) 7A and 7B show various types of work support devices having a tilt mechanism. FIG. 7A is a perspective view of an electromagnetic chuck with a tilt mechanism, FIG. 7B is a perspective view of a tilt-type rotary table, and FIG. 7C is a perspective view of a swivel mechanism. Indicates. (Known)

Hereinafter, the composite surface grinding apparatus of the present invention will be described in more detail with reference to the drawings.
1, 2, 3, and 4, in the compound surface grinding apparatus 1 that shows the position of each member at the standby position before the start of grinding, the compound surface grinding apparatus 1 includes a tool stage 2 and a work stage 3. And a numerical control device 4 shown in FIG.

The tool stage 2 includes a first tool table 22a provided on a first guide rail 21a provided on a tool table base 21 provided on the machine frame 5, and a linear motor drive for the first tool table 22a. And a drive mechanism 23a that reciprocates in the direction, a column 20 provided upright on the tool table base 21, and a grindstone head guide rail 24d provided on the front wall side of the column. A first grinding wheel 26a is provided at the tip of a first grinding wheel shaft 25a for surface grinding of the surface of the object to be ground, and a first lifting mechanism 24a that lifts and lowers the grinding wheel head mounting planing plate 24f in the vertical direction by turning the ball screw 24e. A first whetstone head rotatably supported and the whetstone head so that the axis direction of the first whetstone shaft 25a is horizontal. A first grinding wheel head attached to the mounting planing plate 24f, a grinding wheel shaft rotation drive mechanism 25m for rotating the first grinding wheel 26a around the axis of the first grinding wheel shaft 25a, and a first grinding wheel shaft that is rotatably fixed. Tilt angle adjusting bolts 27 _i for tilting the first grinding wheel 26 a and the tilt direction plus or minus 3 degrees and first tilt head mechanisms 27 a and 27 a for tilting the tilt clamp lever 27 _j ;
A second tool table 22b provided on a second guide rail 21b provided in parallel to the first guide rail 21a on the tool table base 21, and the second tool table 22b. A servo motor is provided on a drive mechanism 23b that reciprocates in the front-rear direction by a linear motor drive, a column 20 provided upright on the tool table base 21, and a grindstone head guide rail 24d provided on the front wall side of the column. A second elevating mechanism 24b that elevates and lowers the grindstone head mounting planing plate 24f in a vertical direction by a turning drive of a ball screw 24e that is rotated by 24c driving, and a second grindstone shaft 25b that performs surface grinding on the surface of an object to be ground The second grinding wheel head that rotatably supports the grinding wheel 26b and the second grinding wheel shaft 25b so that the axial direction of the second grinding wheel shaft 25b is horizontal. A second grinding wheel head attached to the grindstone mounting plate 24f, a grinding wheel shaft rotation drive mechanism 25m for rotating the second grinding wheel 26b around the axis of the second grinding wheel shaft 25b, and a rotation to the second grinding wheel shaft 25b. A tilt angle adjusting bolt 27 _i that tilts the second grinding wheel 26 b that is freely supported in the front-back direction by 1 to 5 degrees, and second tilt head mechanisms 27 b and 27 _b that tilt the tilt clamp lever 27 _j ; An on-machine image comprising a CCD camera 28a and a CCD light source 28b for imaging a first grinding wheel 25a that is rotatably fixed to one grinding wheel shaft and a second grinding wheel 25b that is rotatably fixed to the second grinding wheel shaft. A processing mechanism 28 is installed.

The first grinding wheel 26a and the second grinding wheel 26b described above are protected by safety covers 26c and 26c. A grinding fluid is supplied from a grinding fluid supply nozzle 29 to a grinding point between the first grinding wheel 26a and the material to be ground and a grinding point between the second grinding wheel 26b and the material to be ground. In FIG. 1, 29a and 29b are grinding fluid supply pipes.

As shown by phantom lines in FIG. 3, the tilt head mechanisms 27a and 27b are provided on the first grinding wheel 26a supported on the first grinding wheel shaft 25a and the second grinding wheel 26b supported on the second grinding wheel shaft 25b. The diameter direction can be tilted 1 to 5 degrees in the front-rear direction, and the R-shape and V-groove at the tip of the V-shaped face of the cemented carbide punch with a grinding wheel can be profiled accurately, improving the surface roughness of the vertical surface The processed material can be processed. It is also possible to R-grind the end of the material to be ground. Micromotor is omitted for rotationally driving the tilt angle adjusting bolt 27 _i in FIG.

The first grinding wheel 26a and the second grinding wheel 26b may be the same, such as a grinding wheel shape, a grinding wheel diameter, a grinding wheel width, a binding material, and an abrasive density, except for a different grinding number. Further, depending on the application of the object to be ground, the grinding number, the shape of the grindstone, the diameter of the grindstone, the width of the grindstone, the binder, and the abrasive density may all be different. FIG. 2 shows grinding wheels 26a and 26b having the same outer peripheral flatness and different grinding numbers. The grinding wheel 26 may be an overall grinding wheel 26a, 26b having an inclination on the outer peripheral edge of the same shape with a different grinding number. As the grinding wheel 26, diamond having a grinding number of 200 to 600, an electrodeposited grinding wheel of abrasive grains such as cBN, WC, and GC, a vitrified bond grinding stone, a metal bond grinding stone, a resin bond grinding stone, and the like can be used.

The on-machine image processing mechanism 28 projects the current state of the second grinding wheel 26b, the first grinding wheel 26a, and the material to be ground on the image display board (display) CRT of the numerical controller 4 as an image.

  The work stage 3 is arranged around a work table 31 that can be reciprocated in the left-right direction and a left-right direction (X-axis direction) axis or a front-rear direction (Y-axis direction) axis of the work mounted and fixed on the work table 31. A work support device 33 having a tilt mechanism 32 that can turn the work and a left-right movement mechanism 35 that reciprocates the work table 31 in the left-right direction.

  As the work support device 33, a clamp mechanism comprising a headstock and a tailstock, an electromagnetic chuck 33 with a tilt mechanism shown in FIG. 1, and a rotating shaft of a work chuck 36 for gripping (supporting) a work w shown in FIG. Examples thereof include an NC turning index clamp mechanism 33 that can turn the X axis) around the rotation axis by a rotary actuator (NC indexing mechanism) 32, a tilt type rotary table 60 shown in FIG. 7b, and a swivel 270 shown in FIG. 7c.

The workpiece w is moved by the relative movement of the workpiece table 31 in the horizontal direction, the tilt (turning) tilt around the rotation axis (X axis) of the workpiece by the axis tilt mechanism 32 of the workpiece support device, and the up and down movement of the grindstone shafts 25a and 25b. Groove machining and arc machining are applied to FIG. 4 shows the work position moved using the virtual line.

The horizontal movement means 35 of the work table 31 is a linear motor table drive mechanism 35 having a movable element 31e and a fixed element 31d for reciprocating the sliding material 31b provided on the bottom surface of the work table 31 in the horizontal direction on the guide rail 31c. There may be. The linear motor table drive mechanism 35 may be a high-speed reciprocating tool table drive mechanism using a fluid (oil, water, gas) static pressure sliding guide using a ball screw servo motor drive, or a hydraulic cylinder drive and a V-shaped drive. A tool table reversing mechanism using a sliding guide or a flat sliding guide and a dog and a solenoid valve may be used. The lifting mechanism and the back-and-forth movement mechanism of the tool table may be changed to the same mechanism.

As can be understood from FIGS. 1 and 2, the center point position 31 c of the work table at the standby position of the work table 31 is the position of the center point 31 c of the electromagnetic chuck table or the work table as shown in FIG. 4. The first grinding at the processing start standby position of the first grinding wheel 26a which is located at the workpiece grinding start point 31c position on the workpiece support device 33 mounted on 31 and is rotatably fixed to the first grinding wheel shaft 25a. A central point 26ac in the diametrical direction of the grinding wheel and a central point 26bc in the diametrical direction of the second grinding wheel at the start of machining of the second grinding wheel 26b rotatably fixed to the second grinding wheel shaft 25b are included. The center point 26ac in the diameter direction of the first grinding wheel and the center point 2 in the diameter direction of the second grinding wheel are on the same vertical plane (a plane perpendicular to the plane on the work table 31). Located equidistant from bc.

  When the composite surface grinding device 1 with the workpiece support device 31 is marketed, the composite surface grinding device has the center point position of the work table at the start of the grinding process positioned below the second grinding wheel axis or below the first grinding wheel axis. Or, even if the plane connecting the center point of the first grinding wheel, the center point of the second grinding wheel, and the center point of the work table is not perpendicular to the work table, grinding is performed according to the command of the processing program software. Immediately after the start, the plane connecting the center point position 31c of the work table 31, the center point of the first grinding wheel and the center point of the second grinding wheel is perpendicular to the plane on the work table 31, and the first grinding wheel A compound surface grinding apparatus that operates to be equidistant from the center point 26ac in the wheel diameter direction and the center point 26bc in the diameter direction of the second grinding wheel is also within the scope of the present invention.

The work table 31 constituting the work stage 3 may further include a rotary dresser 40, which is a rear side position of the work support device 33 including the tilt mechanism 32 and is located at a substantially central position of the work table 31. Mounted on.

  In FIG. 1, a work table 31 and a work chuck table 33 at a standby position indicated by a solid line are turned to the left or right at a position of a work table 31 ′ work chuck table 33 ′ indicated by a virtual line during grinding. Also, the first grinding wheel 26a and the second grinding wheel 26b are dressed by the rotary dresser 40 by moving the tool table back and forth at any time before starting grinding, during grinding, or after grinding. Is done. In this dressing operation, the grinding wheel 26 can be molded by tilting the grinding wheel shaft 25 in the front-rear direction by the tilt head mechanism 27. The grinding wheel 26 is programmed to be processed so as to be performed before starting the grinding process, during the grinding process, or after the completion of the grinding process. The grinding wheels 26a and 26b may be dressed at the same time or may be dressed separately.

  The numerical control device 4 shown in FIG. 5 includes a system program memory, a grinding program memory, a threshold memory, an input determination unit, a grinding wheel shaft rotation control unit, a tilt head rotation control unit, a grinding wheel shaft vertical movement control device, and a tool table longitudinal movement control. Device, work table left / right movement drive control unit, work axis tilt mechanism control unit, dressing control unit, image detection unit, grinding program end determination unit, dressing control unit, input determination unit, threshold value management unit, image processing control unit A keyboard and a display (CRT).

The X (left / right) axis linear scale sensor, Y (front / rear) axis linear scale sensor, Z (height) axis linear scale sensor, or displacement sensor not shown in FIG. The coordinate axis value is used for the thickness calculation of the material to be ground (work) that has been ground, and when the value stored in the threshold value memory is reached, a command to stop grinding is issued.

  The composite surface grinding apparatus 1 with a workpiece support device of the present invention is similar to a conventional surface grinding device (including a surface molding grinding device), and a material to be ground is subjected to plunge grinding, shift plunge grinding, traverse grinding, contouring molding. Processing, creep molding, and one-way stroke grinding described in JP-A-2002-346888, rough grinding of a workpiece described in Patent Document 5 (Japanese Patent Application No. 2008-230387), It can be used for processing that performs finish grinding simultaneously.

The surface roughness (Ra) of the workpiece can be measured with a 3D laser microscope KEYENCE VK-8710 (trade name) manufactured by Keyence Corporation.

  The process of grinding a workpiece (workpiece) using the composite surface grinding apparatus 1 with a workpiece support apparatus provided with the tilt mechanism of the present invention is performed as follows.

(1) A material to be ground is placed on the upper surface of the electromagnetic chuck table 33 of the workpiece support device. Alternatively, the workpiece is gripped above the work chuck 36 provided in the work support device (NC turning index clamp mechanism) 33.

  (2) The target machining software number is selected from the machining software selection screen displayed on the display (CRT) screen of the numerical controller 4 by keyboard operation.

  (3) A grinding process condition displayed on the display CRT screen, for example, a grindstone, a stroke width, a grindstone speed, a workpiece axis tilt angle, or the like is selected or input by a keyboard operation.

(4) Select the dressing condition screen and select or input the dressing condition by keyboard operation.

  (5) When the setting of the grinding conditions and dressing conditions is completed, a grinding start button is pressed to start rough grinding of the material to be ground.

(6) Based on the instruction of the machining software program, the work table 31 first moves to the left from the standby position indicated by the solid line in FIG. 1, then turns right and moves to the right, and turns to the left rotation position (standby position). ), And the left and right reciprocating movement is started again at a table speed of 0.1 to 60 m / min.

(7) The first grinding wheel 26a fixed to the first grinding wheel shaft is rotated at 3,000 to 20,000 min ⁻¹ , and the tilting mechanism is provided while lowering the grinding wheel shaft 25a of the first grinding wheel 26a. The rotating grinding surface of the first grinding wheel 26a is brought into contact with the upper surface of the workpiece to be ground which is chucked on the upper surface of the electromagnetic chuck 33, and then cutting is performed to perform rough grinding with a cutting feed amount of 0.0001 to 0.03 mm. Do. The front-rear direction feed speed of the grinding wheel shaft 25a of the first grinding wheel 26a is 0.1 to 1,000 mm / min.

  (8) The work table 31 is reciprocated left and right, cut by lowering the grinding wheel shaft 25a, and the tool table 22a is continuously moved back and forth, so that the first grinding wheel 26a and the material to be ground are relatively ground. The material surface is roughly ground. Depending on the setting of the grinding conditions and dressing conditions, the tilt head mechanism 32 may tilt the workpiece axis (X-axis) and dress the grindstone 26a during the grinding process.

  (9) When the rough grinding of the workpiece is completed, the first grinding wheel 26a is moved away from the surface of the workpiece by raising the first grinding wheel shaft 25a. The rotation of the car 26a is stopped. On the other hand, the work table 31 is also moved to the standby position, and the left-right movement is stopped at the standby position.

(10) Based on the instruction of the machining software program to move to finish grinding, the work table 31 first moves to the right from the standby position indicated by the solid line in FIG. 1, and then turns to the left and moves to the left. Then, a right-and-left reciprocation is started at a table speed of 0.1 to 60 m / min.

(11) The upper surface of the electromagnetic chuck 33 while rotating the second grinding wheel 26b fixed to the grinding wheel shaft 25b at 3,000 to 15,000 min ⁻¹ and lowering the grinding wheel shaft 25b of the second grinding wheel 26b. The rotating grinding wheel 26b is brought into contact with the upper surface of the material to be ground, which is chucked on the surface, and then the cutting is performed, and the finishing grinding is performed with a cutting feed amount of 0.0001 to 0.01 mm. The feed rate in the front-rear direction of the grinding wheel shaft 25b of the finish grinding wheel 26b is 0.1 to 1,000 mm / min.

  (12) The work table 31 is reciprocated in the left and right directions, the incision is made by lowering the grinding wheel shaft 25b, and the tool table 22b is continuously moved back and forth, so that the workpiece is ground by the relative movement between the second grinding wheel 26b and the workpiece. The material surface is finish ground. Depending on the setting of the grinding conditions and dressing conditions, the workpiece axis turning inclination and the dressing of the second grinding wheel 26b may be performed during the grinding process.

  (13) When the finish grinding of the workpiece is finished, the second grinding wheel 26b is moved away from the surface of the workpiece by raising the second grinding wheel shaft 25b. The rotation of the vehicle 26b is stopped. On the other hand, the work table 31 is also moved to the standby position, and the left-right movement is stopped at the standby position.

  (14) After demagnetizing the electromagnetic chuck table 33 of the workpiece support device 31, the ground material to be ground is removed from the upper surface of the electromagnetic chuck table 33. Alternatively, after the work chuck 36 of the work support device 31 is loosened, the ground material to be ground is removed from the chuck gripping portion 36.

  The composite surface grinding machine 1 in which the workpiece support device 33 attached to the X-axis tilt mechanism 32 shown in FIG. 4 is mounted on the work table 31 via the spacer fixing base 37 is used, and cemented carbide V-40 (G- 5), the first grinding wheel # 200 diamond vitrified bond grinding wheel 26a with a vertical cutting speed of 1 mm / min, a forward / backward feed of 0.16 mm / min, and a workpiece axis tilt (turning) angle of 3 degrees or less, the second grinding wheel The # 600 diamond vitrified bond grindstone 26b was plunge-ground with a vertical cutting speed of 0.1 mm / min and a forward / backward feed of 0.18 mm / min and a work table 31 left / right moving speed of 7,200 mm / min to obtain a surface roughness ( A workpiece with a Ra) of 0.637 μm was produced.

The composite surface grinding apparatus 1 with a workpiece support device including a pair of grinding wheel heads 25 and a pair of work tables 31 of the first grinding wheel shaft 25a and the second grinding wheel shaft 25b according to the present invention is capable of roughing a workpiece without replacing the grinding wheel. Grinding and finish grinding can be performed, and grinding time can be shortened. Further, the dressing of the grinding wheels 26a and 26b can be performed with high dimensional accuracy.

DESCRIPTION OF SYMBOLS 1 Composite surface grinding apparatus 2 Tool stage 3 Work stage 4 Numerical control apparatus X Work rotation axis 20 Column 22a First tool table 22b Second tool table 25a First grindstone axis 25b Second grindstone axis 26a First grinding wheel 26b Second Grinding wheel 27 Grinding wheel axis tilt head mechanism 29 Grinding fluid supply nozzle 31 Work table 32 Work axis tilt mechanism 33 Work support device (electromagnetic chuck)
36 Work chuck 40 Rotary dresser

Claims (2)

A work support device comprising a work table capable of reciprocating in the left-right direction, a tilt mechanism capable of turning the work about a left-right axis or a front-rear direction axis of the work mounted and fixed on the work table; A work stage having a left-right movement mechanism for reciprocating the table in the left-right direction;
A first tool table movable in the front-rear direction for fixing the first grinding wheel shaft for fixing the first grinding wheel for grinding the surface of the workpiece to be rotatable, and the first tool table in the front-rear direction. A first grinding stage comprising a back-and-forth movement mechanism for moving the first grinding wheel shaft, a lifting mechanism for the first grinding wheel shaft, and a rotation mechanism for the first grinding wheel shaft,
A second grinding wheel shaft for rotatably fixing a second grinding wheel for grinding the surface of an object to be ground is fixed in a vertical direction on a second tool table provided in parallel with the first tool table in the left-right direction. A second tool table movable in the front-rear direction, a front-rear moving mechanism for moving the second tool table in the front-rear direction, a lifting mechanism for the second grinding wheel shaft, and a rotation mechanism for the second wheel shaft Second grinding stage,
A tool stage with
A composite surface grinding apparatus with a workpiece support device comprising:
The center point position of the work support device at the standby position of the work table on which the work support device is mounted is the machining of the first grinding wheel in which the center point of the work support device is rotatably fixed to the first grindstone shaft. The center point in the diameter direction of the first grinding wheel at the start standby position and the center in the diameter direction of the second grinding wheel at the processing start time of the second grinding wheel rotatably fixed to the second grinding wheel shaft The workpiece is located on the same vertical plane including the point and is equidistant from the center point in the diameter direction of the first grinding wheel and the center point in the diameter direction of the second grinding wheel. Composite surface grinding machine with support device. The rotary grinding wheel dresser installed on the work table of the work stage at a rear side position of the work support device and substantially at the center of the work table is provided. The compound surface grinding apparatus with a workpiece support apparatus as described.

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