JP2008073838A - Traverse grinding device and grinding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a traverse grinding device and grinding method which suppresses uneven wear of a grinding wheel cylindrical surface and highly accurately grinds the cylindrical outer surface of a workpiece in grinding of the cylindrical outer surface of the workpiece. <P>SOLUTION: The traverse grinding device comprises: a workpiece rotating drive mechanism for rotating workpiece to be ground on the rotational axis of the workpiece; a grinding wheel which rotates on the rotational axis inclined with respect to the rotational axis of the workpiece; and a traverse feed mechanism for traversing the grinding wheel along the rotational axis of the workpiece. The grinding wheel has a tapered surface for grinding the vertical surface of the workpiece by the traverse movement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a traverse grinding apparatus and a processing method.

  As a traverse grinding device, it is equipped with a support base that supports and rotates the workpiece and a shaft head that rotates the grindstone, and this shaft head rotates so that it can tilt in the direction of the axis of rotation of the workpiece. There is a cylindrical grinding machine configured freely (for example, Patent Document 1). When traverse grinding is performed with this cylindrical grinder, a disc-shaped grindstone having a taper surface of an appropriate angle on the peripheral surface, in particular, a plurality of taper surfaces of two surfaces or three or more surfaces are provided on the peripheral surface. Grinding is performed by using a disc-shaped grindstone and inclining the grindstone so that the tapered surface of the grindstone follows the peripheral surface and end surface of the workpiece. According to this, since the shaft head is inclined at an arbitrary angle in the rotation axis direction of the workpiece, grinding can be performed on various surfaces such as both end surfaces of the workpiece.

In addition, as a grinding device in which the grinding wheel is inclined with respect to the workpiece, the workpiece is rotationally driven while being supported by a rotationally symmetric workpiece having both ends rotatably fixed to a holder and a grinding spindle. There is a grinding device having a grinding wheel that can move along the rotation axis of the workpiece and can be displaced in the radial direction according to a desired grinding contour of the workpiece (for example, Patent Document 2). When traverse grinding is performed with this profile grinding apparatus, grinding is performed by contacting the grinding wheel only at a point on the vertical line with respect to the workpiece longitudinal axis and the workpiece diameter in the grinding process. According to this, since the grinding wheel is machined by point contact with the workpiece, the generation of heat accompanying the machining can be reduced, the rotational speed of the workpiece and the grinding wheel can be increased, and the grinding time can be shortened.
JP 2003-291062 A Japanese Unexamined Patent Publication No. 60-232857

  However, according to the cylindrical grinding machine disclosed in Patent Document 1, grinding is performed by inclining the grinding wheel so that the cylindrical surface of the grinding wheel follows the peripheral surface and end surface of the workpiece. There is a problem that the grinding wheel cylindrical surface is unevenly worn due to traverse feed, and this wear shape is transferred to the workpiece.To grind with high precision, truing must be performed frequently. There was a problem of taking time. In addition, when the peripheral surface of a workpiece is ground by plunge grinding using this cylindrical grinder, uneven wear at the overhang portion on the end surface of the workpiece or uneven wear at the portion where the processing areas overlap is performed. Etc. occurred, and there was a problem similar to the traverse grinding shown above.

  Further, according to the profile grinding apparatus disclosed in Patent Document 2, since the grinding wheel is inclined with respect to the workpiece and grinding is performed by point contact, the rotational speed can be increased and the grinding time can be shortened. As in the cylindrical grinding machine disclosed in Patent Document 1, when traverse grinding is performed, there is a problem that the wear shape of the grindstone cylindrical surface by traverse feeding is transferred to the workpiece.

  Accordingly, an object of the present invention is to provide a traverse grinding apparatus and a machining method capable of suppressing high-precision grinding by suppressing uneven wear of a grindstone cylindrical surface in grinding of a cylindrical outer surface of a workpiece.

  [1] According to an embodiment of the present invention, a workpiece rotation drive mechanism that rotates a workpiece to be processed on the rotation center axis of the workpiece, and a rotation center axis that is inclined with respect to the rotation center axis of the workpiece. And a traverse feed mechanism for traversing the grinding wheel along the rotation center axis of the workpiece, and the grinding wheel has a tapered surface for grinding a vertical surface of the workpiece by traverse movement. A traverse grinding apparatus is provided.

  [2] The tapered surface of the grinding wheel is relative to a surface perpendicular to the rotation center axis of the grinding wheel, where θ is an inclination angle of the rotation center axis of the grinding wheel with respect to the rotation center axis of the workpiece. The traverse grinding apparatus according to [1] above, which has a taper angle θ.

  [3] The traverse grinding apparatus according to [1], wherein the grinding wheel has another tapered surface.

  [4] According to the embodiment of the present invention, a workpiece rotation drive mechanism that rotates a workpiece to be processed on the rotation center axis of the workpiece, and a rotation center axis that is perpendicular to the rotation center axis of the workpiece. And a traverse feed mechanism that traverses the grinding wheel along the rotation center axis of the workpiece, and the grinding wheel has a cylindrical surface that grinds a vertical surface of the workpiece by traverse movement. A traverse grinding apparatus is provided.

  [5] According to the embodiment of the present invention, the moving step of traversing the grinding wheel along the rotation center axis of the workpiece, and the vertical machining surface perpendicular to the rotation center axis by the grinding by the grinding wheel And a traverse grinding method characterized by comprising:

  [6] According to the embodiment of the present invention, the traverse grinding method according to [5], wherein the traverse feeding operation is performed at a feeding pitch equal to or less than the abrasive grain size of the grinding wheel. provide.

  [7] According to the embodiment of the present invention, the workpiece rotation drive mechanism that rotates the workpiece to be processed on the rotation center axis of the workpiece, and the workpiece rotation control mechanism is controlled at a predetermined angle with respect to the rotation center axis of the workpiece. A grinding wheel that rotates on the rotation center axis in a state where the grinding wheel is rotated, a plunge mechanism that performs grinding by cutting the grinding wheel in the workpiece direction, and a traverse that traverses the grinding wheel along the rotation center axis of the workpiece The grinding wheel has a cylindrical surface for grinding the cylindrical portion of the workpiece by plunge grinding, and a tapered surface for grinding a vertical surface of the workpiece by traverse grinding. Provided is a traverse grinding apparatus that performs processing in combination.

  [8] According to the embodiment of the present invention, after the plunge grinding step of roughly cutting the cylindrical portion of the workpiece by cutting the grinding wheel in the direction of the rotation center axis of the workpiece, and after the plunge grinding step, Grinding wheel inclination control step for controlling the grinding wheel at a predetermined angle with respect to the rotation center axis of the workpiece, and while moving the grinding wheel controlled at the predetermined angle along the rotation center axis of the workpiece, There is provided a traverse grinding method for performing machining by using in combination with plunge grinding characterized by comprising a traverse grinding step for finish grinding a cylindrical portion of a workpiece.

  ADVANTAGE OF THE INVENTION According to this invention, in the grinding process of the cylindrical outer surface of a workpiece, the traverse grinding apparatus and processing method which suppress the partial wear of a grindstone cylindrical surface and enable highly accurate grinding can be provided.

(First embodiment)
FIG. 1 is a plan view of a traverse grinding apparatus according to a first embodiment of the present invention. In FIG. 1, the X direction is defined vertically and the Z direction is defined horizontally.

  The traverse grinding apparatus 1 is controlled by a computer numerical control device (CNC) (not shown), and includes a main body of the traverse grinding device 1 and an accessory device (not shown). Main accessory devices include an oil supply device, a cooling device, an air supply device, a coolant supply device, a chip collecting device, and a duct device for connecting these devices to the traverse grinding device body. The traverse grinding apparatus 1 may constitute a part of a multi-task machine capable of performing various processes such as cutting, grinding, finishing, and heat treatment with the same processing machine.

  The traverse grinding device 1 is placed on a bed 10 and supports a shaft object or a long workpiece W so as to be rotationally driven, and mounted on the bed 10 to move in the X and Z directions. And an X stage 301 and a Z stage 302 that perform positioning, and a grindstone base 200 including a grindstone 210 that is placed on the Z stage 302 in a predetermined position and direction and used for grinding the workpiece W.

  The grinding wheel base 200 or the grinding wheel 210 may be previously placed on the Z stage 302 or on the grinding wheel base 200 in a predetermined position and direction, and may be changed by another tool change tool (ATC: Automatic Tool Changer) (not shown). It may be replaced with a tool. Further, the grindstone platform 200 may be capable of appropriately changing a predetermined position and direction on the Z stage 302. Further, the grindstone table 200 is not only moved in the X and Z directions by the X stage 301 and the Z stage 302 but also moved in the XZ plane by a so-called parallel mechanism or the like in which closed link mechanisms are arranged in parallel. There may be.

  The work support drive unit 100 includes a headstock base 101 placed on a bed 10 and left and right headstocks 103 that are slidably movable via left and right headstock slide guides 102. Is equipped with a main shaft drive motor 104 for driving the main shaft 105 to rotate at a predetermined rotational speed. Each of the left and right headstocks 103 is configured to be able to slide in the Z direction independently on the left and right sides, hold the workpiece W between predetermined centers, and fix the position thereof. The workpiece W is rotationally driven via a non-illustrated rotating metal to rotate the main shaft 105.

  The grinding wheel base 200 includes a grinding wheel 210, a grinding wheel driving motor 220 that rotates the grinding wheel 210 at a predetermined rotational speed, and a grinding wheel shaft 221 that transmits the rotation of the grinding wheel driving motor 220 to the grinding wheel 210. It is configured. The grinding wheel 210 is fixed to the grinding wheel shaft 221 with a flange or the like (not shown), but can be replaced with grinding wheels of various shapes and materials. As the shape of the grinding wheel 210, a flat shape, a ring shape, a taper shape, a dent shape, a cup shape, etc., and as a material, for example, CBN (Cubic Boron Nitride), diamond abrasive grains were used. There are things.

  The traverse grinding apparatus 1 performs so-called plunge grinding by turning the grindstone table 200 in the X direction with a predetermined cut amount by the X stage 301 while rotating the workpiece W at a predetermined rotation speed by the main shaft 105. The traverse grinding is performed by performing a feed operation in the Z direction by 302 with a predetermined feed amount, and also by the Z stage 302 by a predetermined feed amount in the Z direction while cutting by the X stage 301 by a predetermined cut amount in the X direction. By performing the feeding operation, so-called angular grinding can be performed. In the present embodiment, traverse grinding is mainly performed by using a specific shape for the grinding wheel 210 and disposing the grinding wheel base 200 in a specific positional relationship with respect to the workpiece W.

  FIG. 2 shows that a grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground. When the inclination angle of the rotation center axis CL1 of the grinding wheel 210 with respect to the rotation center axis CL2 of the workpiece W is θ, the tapered surface 221a has a taper angle θ with respect to a plane perpendicular to the rotation center axis CL1 of the grinding wheel 210. The angle θ is an angle of 0 degree or more and less than 90 degrees.

  The grinding wheel base 200 on which the grinding wheel 210 is mounted is mounted on the Z stage 302 so as to form an angle of (90−θ) degrees with respect to the X axis. Accordingly, the generatrix of the tapered surface 221a of the grinding wheel 210 that is in contact with the workpiece W is perpendicular to the rotation center axis CL2 of the workpiece W, and is in the same direction as the X axis in FIG. In addition, the bus bar in contact with the workpiece W of the end surface 221b which is another tapered surface is inclined in the same direction as the Z-axis or in a direction in which a gap is formed between the end surface 221b and the workpiece W. In FIG. 2, since the angle α is 90 degrees, the generatrix line in contact with the workpiece W on the end surface 221b coincides with the Z-axis direction, and there is no gap between the end surface 221b and the workpiece W.

(Second Embodiment)
FIG. 3 shows that a grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground, and the shape of the grinding wheel 210 has only one tapered surface 221a. The case where it is comprised is shown. When the inclination angle of the rotation center axis CL1 of the grinding wheel 210 with respect to the rotation center axis CL2 of the workpiece W is θ, the tapered surface 221a has a taper angle θ with respect to a plane perpendicular to the rotation center axis CL1 of the grinding wheel 210. The angle θ is an angle of 0 degree or more and less than 90 degrees. The grinding wheel base 200 on which the grinding wheel 210 is mounted is mounted on the Z stage 302 so as to form an angle of (90−θ) degrees with respect to the X axis. Accordingly, the generatrix of the tapered surface 221a of the grinding wheel 210 that is in contact with the workpiece W is perpendicular to the rotation center axis CL2 of the workpiece W, and is in the same direction as the X axis in FIG. The grinding wheel 210 does not have a surface in contact with the cylindrical outer peripheral surface of the workpiece W due to the shape characteristics of the grinding wheel 210.

(Third embodiment)
FIG. 4 shows that a grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200, and the workpiece W is traverse-ground by the cylindrical surface 221 c of the grinding wheel 210. The cylindrical surface 221c of the grinding wheel 210 is parallel to the rotation center line CL1, and thus the grinding wheel base 200 on which the grinding wheel 210 is mounted is mounted in parallel to the X axis. The grinding wheel 210 shown in FIG. 4 has a shape in which the angle of (90−θ) shown in FIG. 3 becomes zero and the tapered surface 221a becomes a cylindrical surface 221c. It is parallel to the axis.

(Processing process example 1 by the traverse grinding apparatus according to the first embodiment)
FIG. 5 is a diagram illustrating a traverse grinding process performed by the traverse grinding apparatus of FIG. In the description, the angle α is 90 degrees.

  A grinding wheel base 200 on which a grinding wheel 210 having a tapered surface 221a and an end surface 221b is mounted is moved to a machining start position by an X stage 301 and a Z stage 302. The machining start position in the X direction is the finishing dimension position of the workpiece W, and the machining start position in the Z direction is a predetermined position outside the end surface of the workpiece W.

  The grinding wheel 210 is traversed at a predetermined feed pitch by the Z stage 302 while the workpiece W is rotationally driven at a predetermined rotational speed. The feed pitch in the Z direction can be expressed by a feed amount per rotation of the workpiece W.

  FIG. 6 is a diagram schematically illustrating the configuration of the grinding wheel. The grindstone is mainly composed of abrasive grains 401, a binder 402, and pores (not shown) existing in the gap between the abrasive grains 401 and the binder 402. Here, the height from the tip of the abrasive grain 401 to the bottom of the binder 402 is defined as a protrusion amount J.

  When traverse grinding is performed by feeding the grinding wheel 210 in the Z direction at a pitch equal to or greater than the protrusion amount J per rotation of the workpiece W, the taper surface 221a is used when grinding the workpiece W while rotating it in a spiral manner. Thus, the surface to be processed of the workpiece W is processed by the amount of the protrusion amount J, and the remaining processing portion is processed by the end surface 221b.

  In contrast, traverse grinding is performed by feeding the grinding wheel 210 in the Z direction at a pitch equal to or less than the protrusion amount J per rotation of the workpiece W. When a traverse grinding is performed using a CBN grinding wheel having a protrusion amount J of 0.25 mm as the grinding wheel 210 and a feed pitch in the Z direction being 0.25 mm or less, the workpiece W is only on the tapered surface 221a of the grinding wheel 210. It is cut and ground, and is in contact with the end face 221b, but only a spark-out with a cutting depth of zero is made, and grinding is not performed. Here, for example, in a vitrified grindstone, it is not always clear how much the abrasive grain protrusion amount is, and it is difficult to define the abrasive grain protrusion amount. Therefore, in the present processing step example, the feed pitch of the traverse feed operation is defined by the abrasive grain size, and the feed pitch in the Z direction is set to be equal to or less than the abrasive grain size. In this processing example 1, traverse grinding was performed to a predetermined position in the Z direction by setting the feed pitch in the Z direction to 0.1 mm for an abrasive grain size of 0.3 mm.

  In FIG. 2, even when the angle α is an acute angle smaller than 90 degrees, traverse grinding is performed by feeding the grinding wheel 210 in the Z direction at a pitch equal to or smaller than the abrasive grain size per rotation of the workpiece W. Thus, the cylindrical outer peripheral surface of the workpiece W can be ground only by the tapered surface 221a, and the end surface 221b does not contribute to the grinding, so that the cylindrical outer peripheral surface of the workpiece W can be finished flat.

According to this processing step example 1, the following effects are obtained.
(1) In traverse grinding, grinding is performed while cutting the workpiece W mainly with the tapered surface 221a, so that uneven wear hardly occurs on the end surface 221b. In particular, by setting the feed pitch in the Z direction to be equal to or smaller than the abrasive grain size, the cylindrical outer peripheral surface of the workpiece W can be ground only by the tapered surface 221a and the end surface 221b is ground if the workpiece W is ground in a spiral shape while being rotated. Does not contribute. That is, if traverse grinding is performed under the above conditions, uneven wear does not occur on the end surface 221b, and transfer to the work surface due to this uneven wear is suppressed, so that the cylindrical outer peripheral surface of the workpiece W can be accurately finished. It has an effect that can be done.
(2) In the traverse grinding in the present embodiment, the taper surface 221a and the surface to be ground of the workpiece W are processed in linear contact with each other, so that the grinding resistance is small and high-speed grinding can be performed. Has an effect.
(3) Since uneven wear does not occur on the end surface 221b, dressing and truing work for correcting the shape of the grinding wheel 210 are reduced. Therefore, the grinding wheel 210 need only be corrected in shape by the taper surface 221a, which has effects such as reduction in working time and cost.
(4) Since the grinding wheel 210 is disposed at a predetermined angle with respect to the workpiece W and performs grinding, the direction of the grinding force becomes the direction in which the workpiece support rigidity is increased. Has the effect of enabling.

(Processing process example 2 by the traverse grinding apparatus according to the second embodiment)
A case will be described in which traverse grinding similar to that in the processing step example 1 is performed by the traverse grinding apparatus of FIG. The grinding wheel 210 shown in FIG. 3 is configured to have only one tapered surface 221a. Therefore, traverse grinding is performed by feeding the grinding wheel 210 in the Z direction at a pitch equal to or smaller than the abrasive grain size per rotation of the workpiece W. The positioning of the machining start position in the X direction is defined where the tip of the tapered surface 221a contacts the cylindrical outer peripheral surface of the workpiece W. Others are the same as the processing step example 1.

  According to the present machining process example 2, in addition to the effects of the machining process example 1, the grinding wheel shape does not have an end face that does not contribute to the grinding process, and thus there are effects such as cost reduction of the grinding wheel and reduction of the grinding wheel driving power. .

(Example 3 of processing steps by the traverse grinding apparatus according to the third embodiment)
A case will be described in which traverse grinding similar to that in the machining step example 1 is performed by the traverse grinding apparatus of FIG. The grinding wheel 210 shown in FIG. 4 has a cylindrical surface 221c, and the rotation center line CL1 of the grinding wheel 210 is arranged in parallel to the X axis. Therefore, in the traverse grinding, the workpiece W is machined by the cylindrical surface 221c, and the grinding wheel end surface 221d of the grinding wheel 210 is only sparked out, and the machining amount is zero. Further, the positioning of the machining start position in the X direction is defined where the grindstone end surface 221d is in contact with the cylindrical outer peripheral surface of the workpiece W. Others are the same as the processing step example 1.

  According to the present machining process example 3, in addition to the effects of the machining process example 1, grinding is performed in a state where the rotation center line CL1 of the grinding wheel 210 is arranged in parallel to the X axis. Since the workpiece support rigidity is increased, there is an effect that higher performance grinding can be performed.

(Fourth embodiment)
In the first to third embodiments, the case where the workpiece W is machined only by traverse grinding is shown, but in the fourth embodiment, the case where plunge grinding is used together is shown.

  As described in the section of the problem to be solved by the invention, the object of the present invention is to provide a traverse that suppresses uneven wear of the grindstone processing surface and enables high-precision grinding in the grinding of the cylindrical outer surface of the workpiece. The object of the present invention is to provide a grinding apparatus and a processing method. According to this traverse grinding apparatus, the above object can be achieved by using plunge grinding together.

  In grinding of the cylindrical outer surface of the workpiece, in order to enable highly accurate grinding, it is necessary to suppress uneven wear of the grindstone processing surface. For this reason, in the fourth embodiment, the grinding wheel has a cylindrical surface for rough grinding and a tapered surface for finish grinding. Plunge grinding is performed on the cylindrical surface during rough grinding, and traverse grinding is performed on the tapered surface during finish grinding. To do. By plunge grinding on the cylindrical surface, rough grinding is performed while leaving a slight finishing allowance. Thus, in finish grinding by traverse grinding, uneven wear on the tapered surface hardly occurs and a highly accurate ground surface can be obtained.

  FIG. 7A is a configuration diagram showing that a grinding wheel 230 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is plunge-ground by the cylindrical surface 230 b of the grinding wheel 230. The cylindrical surface 230b of the grinding wheel 230 is parallel to the rotation center line CL1, and thus the grinding wheel base 200 on which the grinding wheel 230 is mounted is mounted in parallel to the Z axis. The grinding wheel 230 shown in FIG. 7A is angle-controlled in a state where the grinding wheel base 200 is on the Z stage and the inclination angle θ shown in FIG. 2 is zero. The grinding in this posture is rough grinding using the cylindrical surface 230b of the grinding wheel 230.

  FIG. 8 is a configuration diagram showing that a grinding wheel 230 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground by the tapered surface 230 a of the grinding wheel 230. The angle is controlled so that the inclination angle of the grinding wheel 230 with respect to the rotation center axis CL1 of the grinding wheel 230 and the rotation center axis CL2 of the workpiece W is θ from the posture of the grinding wheel base 200 shown in FIG. The tapered surface 230 a has a taper angle θ with respect to the cylindrical surface 230 b of the grinding wheel 230. The angle θ is an angle of 0 degree or more and less than 90 degrees. The grinding process in this posture is finish grinding using the tapered surface 230a of the grinding wheel 230.

(Processing process example 4 by the traverse grinding apparatus according to the fourth embodiment)
(Rough grinding)
The angle of the grinding wheel base 200 is controlled so that the cylindrical surface 230b of the grinding wheel 230 can plunge-grind the outer peripheral surface of the workpiece W as shown in FIG. FIG. 7B is an operation explanatory view showing the plunge grinding process, and the position of the grinding wheel 230 at the start of the process is indicated by a broken line, and the position during the process is indicated by a solid line.

  7B, at the initial position in the Z-axis direction, a predetermined amount of incision is made in the direction of arrow A to perform plunge grinding, and the grinding wheel 230 is fed by a predetermined pitch in the direction of arrow B. Similarly, plunge grinding is performed. This process is repeated and a predetermined area is applied to the outer peripheral surface of the workpiece W. The amount of movement in the direction of the arrow B is determined to be the same as the width of the cylindrical surface 230b of the grinding wheel 230 or a predetermined pitch so that the processing areas by the cylindrical surface 230b slightly overlap.

  In FIG. 7 (b), the feed direction of the grinding wheel 230 is the arrow B direction, but it may be the direction opposite to the arrow B direction. FIG.7 (c) is operation | movement explanatory drawing which shows the process of the plunge grinding in the case of carrying out the feed operation of the grinding wheel 230 in the reverse direction (arrow C direction) shown in FIG.7 (b), and the time of a process start The position of the grinding wheel 230 is indicated by a broken line, and the position during processing is indicated by a solid line. When the feed operation is performed in this direction, the tapered surface 230a of the grinding wheel 230 does not contact the workpiece W, so that wear of the tapered surface 230a during rough machining can be suppressed.

(Finish grinding)
As shown in FIG. 8, the grinding wheel 230 is angle-controlled so that the outer peripheral surface of the workpiece W and the tapered surface 230 a of the grinding wheel 230 are in contact with each other. The grinding wheel 230 has a cutting amount set so that the tapered surface 230a traverses the outer peripheral surface of the workpiece W with a predetermined finishing allowance. Finish grinding is performed by performing traverse grinding with a predetermined feed amount in the direction C shown in FIG.

According to the fourth machining step example 4, the following effects are obtained.
(1) Rough grinding is performed by plunge grinding before finish grinding by traverse grinding. In the plunge grinding, since the tapered surface 230a used in the traverse grinding process is not used, uneven wear of the tapered surface 230a can be suppressed.
(2) In the finish grinding, the tapered surface 230a of the grinding wheel 230 is used, so that the contact area with the outer peripheral surface of the workpiece W can be increased, and the roughness and shape accuracy of the finished surface can be improved.
(3) By using a processing method that combines plunge grinding with traverse grinding, the processing time can be shortened by rough grinding, and finish grinding is performed by traverse grinding using a tapered surface 230a dedicated to finish grinding. It is possible to improve both the machining efficiency and the roughness accuracy of the machined surface.

1 is a plan view of a traverse grinding apparatus according to a first embodiment of the present invention. This indicates that a grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground. A grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 to indicate that the workpiece W is traverse-ground, and the shape of the grinding wheel 210 has only one tapered surface 221a. It shows the case. It shows that a grinding wheel 210 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground by the cylindrical surface 221c of the grinding wheel 210. It is a figure explaining the process process of the traverse grinding by the traverse grinding apparatus of FIG. It is a figure explaining the composition of a grinding wheel typically. FIG. 7A is a configuration diagram showing that a grinding wheel 230 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is plunge-ground by the cylindrical surface 230 b of the grinding wheel 230. FIG. 7B is an operation explanatory view showing the plunge grinding process, and the position of the grinding wheel 230 at the start of the process is indicated by a broken line, and the position during the process is indicated by a solid line. FIG.7 (c) is operation | movement explanatory drawing which shows the process of the plunge grinding in the case of carrying out the feed operation of the grinding wheel 230 in the reverse direction (arrow C direction) shown in FIG.7 (b), and the time of a process start The position of the grinding wheel 230 is indicated by a broken line, and the position during processing is indicated by a solid line. FIG. 8 is an operation explanatory view showing that the grinding wheel 230 having a predetermined grinding wheel shape is mounted on the grinding wheel base 200 and the workpiece W is traverse-ground by the tapered surface 230a of the grinding wheel 230.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Traverse grinding apparatus 10 Bed 100 Work support drive unit 101 Spindle base 102 Spindle base slide guide 103 Spindle base 104 Spindle drive motor 105 Spindle 200 Grinding wheel base 210, 230 Grinding wheel 220 Grinding wheel drive motor 221 Grinding wheel axis 301 X stage 302 Z stage 401 Abrasive grains 402 Binder

Claims (8)

A workpiece rotation drive mechanism for rotating the workpiece to be processed on the rotation center axis of the workpiece;
A grinding wheel that rotates on a rotation center axis inclined with respect to the rotation center axis of the workpiece;
A traverse feed mechanism for traversing the grinding wheel along the rotation center axis of the workpiece,
The traverse grinding apparatus, wherein the grinding wheel has a tapered surface for grinding a vertical surface of the workpiece by traverse movement.   The taper surface of the grinding wheel has a taper angle θ with respect to a surface perpendicular to the rotation center axis of the grinding wheel, where θ is an inclination angle of the rotation center axis of the grinding wheel with respect to the rotation center axis of the workpiece. The traverse grinding apparatus according to claim 1, comprising:   The traverse grinding apparatus according to claim 1, wherein the grinding wheel has another tapered surface. A workpiece rotation drive mechanism for rotating the workpiece to be processed on the rotation center axis of the workpiece;
A grinding wheel that rotates on a rotation center axis perpendicular to the rotation center axis of the workpiece;
A traverse feed mechanism for traversing the grinding wheel along the rotation center axis of the workpiece,
The traverse grinding apparatus, wherein the grinding wheel has a cylindrical surface for grinding a vertical surface of the workpiece by traverse movement. A moving step for traversing the grinding wheel along the rotation center axis of the workpiece;
A machining step of forming a vertical machining surface perpendicular to the rotation center axis on the workpiece by grinding with the grinding wheel;
A traverse grinding method characterized by comprising:   6. The traverse grinding method according to claim 5, wherein the traverse feed operation is performed at a feed pitch equal to or less than an abrasive grain size of the grinding wheel. A workpiece rotation drive mechanism for rotating the workpiece to be processed on the rotation center axis of the workpiece;
A grinding wheel that rotates on the rotation center axis in a state controlled at a predetermined angle with respect to the rotation center axis of the workpiece;
A plunge mechanism that performs grinding by cutting the grinding wheel in the workpiece direction; and
A traverse feed mechanism for traversing the grinding wheel along the rotation center axis of the workpiece,
The grinding wheel has a cylindrical surface that grinds a cylindrical portion of the workpiece by plunge grinding and a tapered surface that grinds a vertical surface of the workpiece by traverse grinding. Traverse grinding device. A plunge grinding step of cutting the grinding wheel in the direction of the rotation center axis of the workpiece to roughly grind the cylindrical portion of the workpiece;
After the plunge grinding step, a grinding wheel inclination control step for controlling the grinding wheel at a predetermined angle with respect to the rotation center axis of the workpiece;
A traverse grinding step of finish grinding the cylindrical portion of the workpiece while moving the grinding wheel controlled at the predetermined angle along the rotation center axis of the workpiece;
A traverse grinding method for performing processing by using plunge grinding in combination.

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