JP7104506B2 - Inner peripheral surface processing equipment and inner peripheral surface processing method - Google Patents

Description

The present invention relates to an inner peripheral surface processing apparatus and an inner peripheral surface processing method for processing the inner peripheral surface of a cylinder portion surrounding the cylinder bore of a workpiece on which a cylinder bore is formed.

Conventionally, when manufacturing a workpiece having a cylinder portion having a cylinder bore having a substantially cylindrical shape, such as a cylinder block or a valve cylinder used for an automobile engine, cutting processing is performed as a finishing process of the inner peripheral surface of the cylinder portion. Boring processing or reamer processing) and honing processing are performed (see, for example, Patent Document 1 below). Specifically, for a workpiece having a cast cylinder portion, a cutting tool is first inserted into the cylinder portion, and the cutting tool is rotated to move along the inner peripheral surface of the cylinder portion to move the cylinder. Cut the inner peripheral surface of the part. Next, a honing tool is inserted into the cylinder portion, and the inner peripheral surface of the cylinder portion is polished by rotating the honing tool and expanding the diameter until it comes into contact with the inner peripheral surface of the cylinder portion. By such a cutting process and a honing process, the inner peripheral surface is machined so that the inner diameter of the cylinder portion has a desired size.

Japanese Unexamined Patent Publication No. 2004-114236

However, in recent years, from the viewpoint of improving fuel efficiency and reliability of automobile engines, the cylinder portion conventionally composed of FC250 is now being composed of a heat-resistant alloy such as stainless steel or Ni-based alloy. Heat-resistant alloys such as stainless steel and Ni-based alloys are difficult-to-cut materials with high hardness. Therefore, if the cylinder part is made of a difficult-to-cut material, the cutting tool wears quickly during surface processing, and chipping is likely to occur, resulting in tool life. There was a problem that was significantly shortened. Therefore, the cost of the tool has increased. In addition, it becomes difficult to control the inner diameter dimension of the cylinder portion due to wear and chipping of the cutting tool, and the allowance in the honing process of the subsequent process fluctuates, which causes a problem that the processing quality and the processing time vary. In addition, these problems have resulted in the adverse effect of lowering the processing quality and the yield.

The present invention has been made in view of this point, and an object of the present invention is an inner peripheral surface processing device for processing the inner peripheral surface of a cylinder portion surrounding the cylinder bore of a workpiece on which a cylinder bore is formed, and an inner peripheral surface processing. The method is to reduce processing costs and improve processing quality and yield.

In order to achieve the above object, in the present invention, the inner peripheral surface of the cylinder portion is processed by performing grinding processing and honing processing on the workpiece on which the cylinder bore is formed.

Specifically, the first invention is an inner peripheral surface processing device for processing the inner peripheral surface of a cylinder portion surrounding the cylinder bore of a workpiece in which a cylinder bore is formed, and has a diameter smaller than the inner diameter of the cylinder portion. A grinding unit having a cylindrical grinding wheel, rotating the grinding wheel around the center line in the cylinder portion to grind the inner peripheral surface of the cylinder portion, a plurality of honing grindstones, and the like. Honing that has a cylindrical grindstone holder on which a plurality of honing grindstones are mounted radially, and rotates the grindstone holder around the center line in the cylinder portion to perform honing processing for polishing the inner peripheral surface of the cylinder portion. The machining section, the grinding section, the honing section, and the workpiece are relatively moved, and the grinding position where the cylinder section faces the grinding wheel and the honing position where the cylinder section faces the grinding wheel holder. After controlling the operation of the moving mechanism arranged in, the grinding part, the honing part, and the moving mechanism, the cylinder part is arranged at the grinding position, and the inner peripheral surface is subjected to the grinding. It is characterized in that the cylinder portion is arranged at the honing processing position, and the inner peripheral surface is provided with a control unit for executing the inner peripheral surface processing control for performing the honing processing.

In the first invention, a plurality of inner peripheral surface processing devices for processing the inner peripheral surface of the cylinder portion of the workpiece include a grinding portion that grinds the inner peripheral surface of the cylinder portion by rotating a grinding wheel around the center line. The honing part that grinds the inner peripheral surface of the cylinder part by rotating the grindstone holder with the honing grinds mounted radially around the center line, and the grinding position facing the grinding grind and the grindstone holder. It is configured to include a moving mechanism arranged at the honing processing position, a grinding processing unit, a honing processing unit, and a control unit for controlling the operation of the moving mechanism. In this inner peripheral surface processing device, the cylinder portion of the workpiece is arranged at the grinding processing position, and after the inner peripheral surface is ground, it is arranged at the honing processing position by the inner peripheral surface processing control by the control unit. The inner peripheral surface will be honed. That is, according to the inner peripheral surface processing device, the grinding process and the honing process of the inner peripheral surface of the cylinder portion can be performed by one processing device. Since the roughing to the finishing can be performed by one processing device in this way, the inner peripheral surface of the cylinder portion is processed as compared with the case where the grinding device and the honing device are separately provided. The peripheral surface processing system can be compactly configured with one processing device. In addition, when the inner peripheral surface machining system is configured with a plurality of devices, the distance for moving the workpiece to perform honing after grinding becomes longer, and the machining time required for inner peripheral surface machining becomes longer. According to the inner peripheral surface processing device, since the grinding process and the honing process can be performed by one processing device, the transition from the grinding process to the honing process becomes smooth and the processing time can be shortened.

Further, in the first invention, a grinding process is provided, and the grinding process is performed instead of the conventional cutting process. Here, the grinding wheel is cheaper than the cutting tool, and even if the difficult-to-cut material is processed and worn, it can be used continuously until the grinding wheel itself disappears, so that the life of the grinding wheel is longer than that of the cutting tool. Therefore, according to the above-mentioned inner peripheral surface processing apparatus, the cost (particularly, tool cost) required for the inner peripheral surface processing is reduced by providing a grinding processing portion and performing grinding processing instead of the conventional cutting processing. be able to. Further, according to the above-mentioned inner peripheral surface processing apparatus, the inner diameter of the cylinder portion is increased due to wear or chipping of the cutting tool, as in the conventional technique of performing the cutting process before the honing process by performing the grinding process before the honing process. Dimension control does not become difficult. Therefore, since the machining allowance in honing processing fluctuates, the processing quality and processing time do not vary, and it is possible to suppress a decrease in processing quality and yield.

Further, in the first invention, in addition to the above configuration, in the grinding wheel and the honing section, the center line of the grinding wheel and the center line of the grindstone holder are arranged in parallel, and the grinding wheel and the grinding wheel are arranged in parallel. The grindstone holder is configured to advance and retreat in the direction of the center line, and the moving mechanism moves the workpiece to transfer the work, which arranges the cylinder portion at the grinding position and the honing position. It is characterized by being composed of parts.

In the first invention, the center line of the grinding wheel and the center line of the grindstone holder are arranged in parallel. Then, the cylinder portion is conveyed to the grinding processing position and the honing processing position by moving the workpiece by the work conveying portion constituting the moving mechanism. As described above, the moving mechanism can be easily configured by configuring the moving mechanism by the work transporting portion that moves the workpiece instead of moving the grinding and honing parts having a complicated structure.

Further, in the first invention, in addition to the above configuration, the work piece has a plurality of the cylinder parts arranged in a line at equal intervals, and the control part controls the work piece in the inner peripheral surface machining control. The plurality of cylinders are sent out in the arrangement direction of the plurality of cylinders, and the plurality of cylinders are arranged in order at the grinding position and the honing position in the order of arrangement. It is characterized in that the operations of the grinding process, the honing section, and the work transfer section are controlled so that the grinding process and the honing process are performed in order.

In the first invention, the workpiece is sent out in the arrangement direction of the plurality of cylinder portions, and the plurality of cylinder portions are arranged in the grinding position and the honing processing position in the order of arrangement with respect to the inner peripheral surfaces of the plurality of cylinder portions. Grinding and honing are performed in order of arrangement. Therefore, according to the above-mentioned inner peripheral surface processing apparatus, even if the workpiece has a plurality of cylinder portions, grinding and honing of the inner peripheral surfaces of the plurality of cylinder portions can be easily performed by one processing apparatus. Can be done.

In the second invention, in the first invention, the workpiece has four cylinder portions arranged in a line at equal intervals, and the four cylinder portions are arranged in order, a first cylinder portion and a second cylinder portion. The grinding section and the honing section are composed of a third cylinder section and a fourth cylinder section, and when the first cylinder section is arranged at the honing machining position, the third cylinder section is ground. It is arranged at the machining position, and when the second cylinder portion is arranged at the honing processing position, the fourth cylinder portion is arranged at the grinding processing position, and the control unit is the inner peripheral surface. In the machining control, the grinding process on the inner peripheral surface of the third cylinder portion and the honing process on the inner peripheral surface of the first cylinder portion are performed in parallel, and the processing on the inner peripheral surface of the fourth cylinder portion is performed. It is characterized in that the operations of the grinding process, the honing section, and the work transfer section are controlled so that the grinding process and the honing process on the inner peripheral surface of the second cylinder portion are performed in parallel.

In the second invention, a workpiece having four cylinder portions arranged in a row at equal intervals is targeted for machining, and the arrangement order of the four cylinder portions, that is, the first cylinder portion, the second cylinder portion, and the third cylinder portion, Grinding and honing are performed on the inner peripheral surface in the order of the fourth cylinder portion in this order. Further, in the inner peripheral surface processing apparatus, when the workpiece is sent in the arrangement direction of the four cylinder portions and the first cylinder portion is arranged at the honing processing position facing the grindstone holder, the third cylinder portion Is placed at the grinding position facing the grinding wheel, and similarly, the workpiece is sent in the arrangement direction of the above four cylinders and the second cylinder is placed at the honing position facing the grinding wheel holder. At that time, the fourth cylinder portion is arranged at the grinding processing position facing the grinding wheel.

In the above-mentioned inner peripheral surface processing apparatus, based on such a configuration, grinding processing on the inner peripheral surface of the third cylinder portion and honing processing on the inner peripheral surface of the first cylinder portion are performed in parallel, and the inner circumference of the fourth cylinder portion is performed in parallel. Grinding on the surface and honing on the inner peripheral surface of the second cylinder are performed in parallel. In this way, instead of performing honing on the inner peripheral surfaces of the four cylinders after all the grinding is completed, grinding and honing are performed on some of the cylinders in parallel. Therefore, the time required for machining the inner peripheral surfaces of the four cylinder portions can be shortened.

A third invention is characterized in that, in the first or second invention, the workpiece is a cylinder block.

In the third invention, the cylinder block is processed, and the inner peripheral surface of the cylinder portion of the cylinder block is subjected to grinding and honing.

The fourth invention is premised on an inner peripheral surface processing method for processing the inner peripheral surface of a cylinder portion surrounding the cylinder bore of a workpiece on which a cylinder bore is formed.

Then, in the inner peripheral surface processing method according to the fourth invention, after grinding the inner peripheral surface of the cylinder portion with a grinding wheel, the inner peripheral surface of the cylinder portion ground by the grinding process is subjected to grinding. It is characterized by performing honing processing that polishes with a honing grindstone.

In the fourth invention, the inner peripheral surface of the cylinder portion of the workpiece on which the cylinder bore is formed is ground by grinding the inner peripheral surface with a grinding wheel instead of the conventional cutting process. Honing processing is performed to polish the inner peripheral surface with a honing grindstone. Here, the grinding wheel is cheaper than the cutting tool, and even if the difficult-to-cut material is processed and worn, it can be used continuously until the grinding wheel itself disappears, so that the life of the grinding wheel is longer than that of the cutting tool. Therefore, according to the above-mentioned inner peripheral surface processing method, it is possible to reduce the cost (particularly, tool cost) required for the inner peripheral surface processing by performing the grinding process instead of the conventional cutting process. Further, according to the above-mentioned inner peripheral surface processing method, the inner diameter of the cylinder portion is increased due to wear or chipping of the cutting tool, as in the conventional technique of performing the cutting process before the honing process by performing the grinding process before the honing process. Dimension control does not become difficult. Therefore, since the machining allowance in honing processing fluctuates, the processing quality and processing time do not vary, and it is possible to suppress a decrease in processing quality and yield.

Further, in the fourth invention, in addition to the above configuration, the workpiece has four cylinder portions arranged in a line at equal intervals, and the four cylinder portions are arranged in order, a first cylinder portion and a second cylinder portion. And the third cylinder portion and the fourth cylinder portion, and the grinding process and the honing process are performed in this order on the inner peripheral surfaces of the four cylinder portions in the order of arrangement of the four cylinder portions. The grinding process on the inner peripheral surface of the third cylinder portion and the honing process on the inner peripheral surface of the first cylinder portion are performed in parallel, and the grinding process on the inner peripheral surface of the fourth cylinder portion and the second cylinder portion are performed in parallel. It is characterized in that the above-mentioned honing process on the inner peripheral surface of the cylinder is performed in parallel.

In the fourth invention, a workpiece having four cylinder portions arranged in a row at equal intervals is targeted for machining, and the arrangement order of the four cylinder portions, that is, the first cylinder portion, the second cylinder portion, and the third cylinder portion. Grinding and honing are performed on the inner peripheral surface in the order of the fourth cylinder portion in this order. Further, in the above-mentioned inner peripheral surface processing method, the grinding process on the inner peripheral surface of the third cylinder portion and the honing process on the inner peripheral surface of the first cylinder portion are performed in parallel, and the grinding process on the inner peripheral surface of the fourth cylinder portion is performed. Honing processing on the inner peripheral surface of the second cylinder portion is performed in parallel. In this way, instead of performing honing on the inner peripheral surfaces of the four cylinders after all the grinding is completed, grinding and honing are performed on some of the cylinders in parallel. Therefore, the time required for machining the inner peripheral surfaces of the four cylinder portions can be shortened.

A fifth invention is characterized in that, in the fourth invention, the workpiece is a cylinder block.

In the fifth invention, the cylinder block is processed, and the inner peripheral surface of the cylinder portion of the cylinder block is subjected to grinding and honing.

As described above, according to the present invention, in the inner peripheral surface processing apparatus and the inner peripheral surface processing method for processing the inner peripheral surface of the cylinder portion of the workpiece in which the cylinder bore is formed, the processing cost is reduced and the processing quality and yield are improved. It can be improved.

FIG. 1 is a perspective view showing a schematic configuration of an inner peripheral surface processing apparatus according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a grinding wheel portion of the inner peripheral surface processing apparatus shown in FIG. FIG. 3 is a vertical cross-sectional view of the honing head portion of the inner peripheral surface processing apparatus shown in FIG. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a perspective view showing a state in which the work is in the loading / unloading position in the inner peripheral surface processing apparatus shown in FIG. FIG. 6 is a perspective view showing a state in which the work is in the first machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 7 is a perspective view showing a state in which the work is in the second machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 8 is a perspective view showing a state in which the work is in the third machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 9 is a perspective view showing a state in which the work is in the fourth machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 10 is a perspective view showing a state in which the work is in the fifth machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 11 is a perspective view showing a state in which the work is in the sixth machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 12 is a perspective view showing a schematic configuration of an inner peripheral surface processing apparatus according to a second embodiment of the present invention. FIG. 13 is a perspective view showing a state in which the work is in the loading / unloading position in the inner peripheral surface processing apparatus shown in FIG. FIG. 14 is a perspective view showing a state in which the work is in the first machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 15 is a perspective view showing a state in which the work is in the second machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 16 is a perspective view showing a state in which the work is in the third machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 17 is a perspective view showing a state in which the work is in the fourth machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 18 is a perspective view showing a state in which the work is in the fifth machining position in the inner peripheral surface machining apparatus shown in FIG. FIG. 19 is a perspective view showing a state in which the work is in the sixth machining position in the inner peripheral surface machining apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferred examples and are not intended to limit the scope of the invention, its applications, or its uses.

<< Embodiment 1 of the invention >>
1 and 2 show an inner peripheral surface processing apparatus 1 according to the first embodiment of the present invention. The inner peripheral surface processing device 1 processes the inner peripheral surface of the cylinder portion C surrounding the cylinder bore B of the work (workpiece) W on which the cylindrical cylinder bore B is formed. In the first embodiment, the inner peripheral surface processing device 1 is a so-called NC machine tool, and the engine block in which four cylinder bores B arranged in a row are formed is used as the work W, and the cylinder unit is automatically controlled by numerical control. It is configured to perform grinding and honing of the inner peripheral surface C0 of C.

Here, the cylinder portion C refers to a cylindrical peripheral wall portion surrounding the four cylinder bores B in the work W composed of the cylinder block.

In the following description, as shown in FIG. 1, the width direction of the inner peripheral surface processing device 1 (the direction from the front right front to the back left of the paper surface) is the X-axis direction, and the depth direction of the inner peripheral surface processing device 1 (paper surface). The direction from the front left to the back right) is called the Y-axis direction, and the height direction of the inner peripheral surface processing device 1 (the vertical direction of the paper surface) is called the Z-axis direction. Further, the left side of the paper surface in FIG. 1 is referred to as "left side" and the right side of the paper surface is referred to as "right side" along the X-axis direction. Further, the front side of the paper surface in FIG. 1 is referred to as the "front side" and the back side of the paper surface is referred to as the "rear side" along the Y-axis direction.

-Constitution-
As shown in FIG. 1, the inner peripheral surface processing device 1 includes a bed 2, a column 3, and a honing column 4. The bed 2 is formed in a substantially T shape by a rectangular cuboid member 2a extending in the X-axis direction and a rectangular cuboid member 2b extending in the Y-axis direction, and is placed on a horizontal installation surface. The column 3 is composed of a member having a rectangular cuboid shape extending in the Z-axis direction, and is erected on the member 2b extending in the Y-axis direction of the bed 2. The honing column 4 is composed of members having a rectangular cuboid shape extending in the Z-axis direction, which is narrower and lower in height than the column 3, and is fixed to the upper right side of the column 3 so that the load is supported by the column 3. .. The bed 2, the column 3, and the honing column 4 form a support structure for the inner peripheral surface processing device 1.

Further, the inner peripheral surface processing device 1 includes a grinding unit 10, a honing unit 20, a work transfer unit (moving mechanism) 30, and a control unit 40. The grinding unit 10, the honing unit 20, the work transfer unit 30, and the control unit 40 are provided on the support structure of the inner peripheral surface processing device 1. Specifically, the grinding unit 10 is installed in the column 3, the honing unit 20 is installed in the honing column 4, and the work transfer unit 30 and the control unit 40 are installed in the bed 2.

Hereinafter, the configuration of each part will be described in detail.

<Grinding section>
As shown in FIG. 1, the grinding unit 10 includes a grinding grindstone 11, a grinding spindle 12, a grinding holder 13, a grinding main body 14, a grinding table 15, a Z-axis guide 16, and a rotation motor 17. It has a Z-axis motor 18.

As shown in FIG. 2, the grinding wheel 11 is formed in a cylindrical shape whose outer diameter is smaller than the inner diameter of the cylinder portion C of the work W.

The grinding spindle 12 is composed of a rod-shaped member having a cylindrical cross section extending in the Z-axis direction. A grinding wheel 11 is attached to the tip of the grinding spindle 12 (lower end in the present embodiment) so that the center line Z1 coincides with the tip (see FIG. 2). On the other hand, the base end (upper end in this embodiment) of the grinding spindle 12 is rotatably held by the grinding holder 13.

The grinding holder 13 is formed in a cylindrical shape and is held by the grinding body portion 14. Further, the grinding holder 13 rotatably holds the base end of the grinding spindle 12 so that the grinding spindle 12 can rotate on its axis.

The grinding body 14 is formed in a rectangular cuboid shape and holds the grinding holder 13 in front, while the rear surface is fixed to the grinding table 15.

The grinding table 15 is formed in a rectangular cuboid-shaped box shape, the above-mentioned grinding body portion 14 is fixed to the front surface, and the rear surface is formed in a shape that meshes with the Z-axis guide 16. The grinding table 15 is configured to be movable in the Z-axis direction by the Z-axis guide 16. By reciprocating in the Z-axis direction, the grinding table 15 moves the grinding wheel 11 up and down in the Z-axis direction via the grinding main body 14, the grinding holder 13, and the grinding spindle 12.

The Z-axis guide 16 is a long member provided on the front surface of the column 3 and extending long in the Z-axis direction. In the present embodiment, the Z-axis guide 16 is composed of a rectangular plate-like body long in the Z-axis direction. The Z-axis guide 16 is formed from the upper end portion to the lower end portion of the column 3. The Z-axis guide 16 may have any shape as long as it guides the movement of the grinding table 15 in the Z-axis direction. The Z-axis guide 16 may be formed by two rails.

The rotation motor 17 is provided on the upper part of the grinding holder 13. The drive shaft of the rotation motor 17 is connected to the grinding spindle 12 inside the grinding holder 13 so that the grinding spindle 12 held by the grinding holder 13 rotates on its axis. When the rotation motor 17 rotates the grinding spindle 12, the grinding wheel 11 attached to the grinding spindle 12 rotates around the center line Z1. That is, the center line Z1 of the grinding spindle 12 becomes the rotation axis of the grinding wheel 11.

The Z-axis motor 18 is provided in the column 3. The Z-axis motor 18 is connected to the grinding table 15 so that the grinding table 15 reciprocates in the Z-axis direction along the Z-axis guide 16. When the Z-axis motor 18 moves the grinding table 15 up and down, the grinding wheel 11 moves up and down via the grinding body 14, the grinding holder 13, and the grinding spindle 12.

<Honing processing section>
As shown in FIGS. 1, 3 and 4, the honing processing portion 20 includes a honing spindle 22 to which a plurality of honing grindstones 21 are attached, an expansion rod 23, a floating mechanism 24, a honing main body portion 25, and Z. It has a shaft guide 26, an expansion motor 27, a rotary motor 28, and a Z-axis motor 29.

The honing spindle 22 is formed in a cylindrical shape extending in the Z-axis direction. The honing spindle 22 has a spindle body 22a, an intermediate shaft portion 22b, and a grindstone holder 22c.

The spindle body 22a is provided in the honing body 25. The base end (upper end in this embodiment) of the main shaft main body 22a is rotatably connected to the honing main body 25, and the tip end (lower end in this embodiment) is connected to the floating mechanism 24.

The intermediate shaft portion 22b is formed of a cylindrical member, the base end (upper end in the present embodiment) is connected to the floating mechanism 24, and the grindstone holder 22c is connected to the tip end (lower end in the present embodiment).

The grindstone holder 22c is formed of a cylindrical member having a diameter larger than that of the intermediate shaft portion 22b, and a plurality of slits 22d (six in this embodiment) on which the honing grindstone 21 is mounted are formed on the tip end side. The center line Z2 of the grindstone holder 22c is formed so as to coincide with the center line Z2 of the intermediate shaft portion 22b. The plurality of slits 22d are formed at the same position in the Z-axis direction in the grindstone holder 22c, and are formed so as to be arranged at equal intervals in the circumferential direction of the grindstone holder 22c. One honing grindstone 21 is slidably mounted in each of the plurality of slits 22d in the radial direction of the grindstone holder 22c.

The honing grindstone 21 mounted on each slit 22d is composed of a grindstone piece 21a and a plate-shaped support plate 21b for holding the grindstone piece 21a. The grindstone piece 21a is formed in the shape of a rectangular plate long in the Z-axis direction. The support plate 21b is formed of a plate-like member having a thickness slightly thinner than the width of the slit 22d and long in the Z-axis direction, and the grindstone piece 21a is fixed to the outer surface. When the support plate 21b is mounted on the grindstone holder 22c, the two points on the inner surface in the Z-axis direction are tapered so as to be inclined inward in the radial direction toward the tip end side (lower side) of the grindstone holder 22c. It is configured on the surface 21c. The two tapered surfaces 21c are configured as inclined surfaces having substantially the same inclination angle as the outer peripheral surface (cone surface) of the cone portion 23b of the expansion rod 23, which will be described later.

When the expansion rod 23 moves downward, the plurality of honing grindstones 21 are pushed by the outer peripheral surface (cone surface) of the cone portion 23b and slide outward in the radial direction in each slit 22d. As a result, the grindstone diameter R (diameter of the circumscribed circle of the plurality of grindstone pieces 21a) of the honing portion 20 is expanded. The honing portion 20 is configured such that the minimum value of the grindstone diameter R is smaller than the diameter of the inner peripheral surface C0 of the cylinder portion C.

Further, although not shown, the plurality of honing grindstones 21 include each honing grindstone 21 that slides outward in the radial direction in each slit 22d when the expansion rod 23 that has been moved downward is moved upward. A return mechanism is provided that exerts a force that moves inward in the radial direction on each honing wheel 21. The return mechanism may be an elastic body or a link member.

The expansion rod 23 is formed in a rod shape extending in the Z-axis direction, and is housed inside the honing spindle 22. The expansion rod 23 has a columnar rod body 23a and two conical cone portions 23b.

The rod body 23a is housed in the intermediate shaft portion 22b so that the center line coincides with the intermediate shaft portion 22b of the honing main shaft 22 and the center line Z2 of the grindstone holder 22c, and slides in the axial direction with respect to the intermediate shaft portion 22b. It is freely configured.

The two cone portions 23b are formed in a conical shape of the same size, and the center line coincides with the center line of the rod body 23a with the top facing the tip side (lower side in this embodiment) of the honing spindle 22. As described above, the rod body 23a is integrally formed at the lower end portion. The two cone portions 23b are formed so that the outer peripheral surface (cone surface) is substantially equal to the tapered surface 21c of the support plate 21b of the two honing grindstones 21, and the outer peripheral surface of the upper cone portion 23b is on the upper side. The outer peripheral surfaces of the lower cone portion 23b are aligned in the axial direction of the rod main body 23a at intervals such that they abut on the tapered surface 21c and the outer peripheral surface of the lower cone portion 23b abuts on the lower tapered surface 21c.

The lower end of the rod body 23a on which the two cones 23b are formed, the grindstone holder 22c formed on the lower end of the honing spindle 22 described above, and the plurality of honing grindstones 21 mounted on the grindstone holder 22c. , The honing head 20a that performs honing processing is configured in the honing processing unit 20.

The floating mechanism 24 includes a center line ZC of the inner peripheral surface C0 of the cylinder portion C to be honed due to an alignment error, thermal deformation of the cylinder portion C, and the like, and a plurality of honing processed portions 20 for polishing the inner peripheral surface C0. The center line of the cylinder circumscribing the grindstone piece 21a of the above, and the misalignment (about several μm) with the grindstone center line Z2 that coincides with the center line Z2 of the grindstone holder 22c is corrected to correct the misalignment (about several μm) of the inner peripheral surface C0 of the cylinder portion C. The center line ZC and the grindstone center line Z2 of the honing portion 20 are matched with each other.

The floating mechanism 24 is provided between the main shaft main body 22a of the honing main shaft 22 and the intermediate shaft portion 22b, and connects the main shaft main body 22a and the intermediate shaft portion 22b. The floating mechanism 24 holds the intermediate shaft portion 22b in a predetermined range so as to be displaceable in the horizontal direction, and intermediates the rotational force of the spindle main body 22a so that the intermediate shaft portion 22b rotates in conjunction with the rotation of the spindle main body 22a. It is configured to transmit to the shaft portion 22b. The floating mechanism 24 can be realized by providing two universal joints.

When honing the inner peripheral surface C0 of the cylinder portion C is performed by such a floating mechanism 24, the center line ZC of the inner peripheral surface C0 of the cylinder portion C and the grindstone center line Z2 of the honing processed portion 20 are deviated from each other. However, when the honing grindstone 21 of the honing portion 20 is inserted into the cylinder portion C to expand the grindstone diameter R, the grindstone piece 21a located in the direction in which the grindstone center line Z2 deviates from the center line ZC A force acts on the grindstone holder 22c on which the honing grindstone 21 is mounted in a direction in which the grindstone center line Z2 coincides with the center line ZC due to the reaction of the contact with the inner peripheral surface C0 of the cylinder portion C. As a result, the intermediate shaft portion 22b of the honing spindle 22 whose upper end is connected to the floating mechanism 24 and whose lower end is connected to the grindstone holder 22c is displaced in the direction of the force acting on the grindstone holder 22c, and the grindstone center line Z2 is the center. It will match the line ZC.

The honing main body 25 is formed by a member long in the Y-axis direction, and while the main shaft main body 22a of the honing main shaft 22 is rotatably held inside the front end portion, the rear surface is formed in a shape that meshes with the Z-axis guide 26. .. The honing main body 25 is configured to be movable in the Z-axis direction by the Z-axis guide 26. The honing main body 25 moves up and down in the Z-axis direction by reciprocating in the Z-axis direction. The honing main body 25 is provided with the above-mentioned rotary motor 28 that rotationally drives the main shaft main body 22a of the honing main shaft 22.

The Z-axis guide 26 is a long member provided on the front surface of the honing column 4 and extending in the Z-axis direction, and in the present embodiment, is composed of two rail members extending in the Z-axis direction. The Z-axis guide 26 is formed from the upper end portion to the lower end portion of the honing column 4. The Z-axis guide 26 may have any shape as long as it guides the movement of the honing main body 25 in the Z-axis direction. The Z-axis guide 26 may be formed in a shape like the Z-axis guide 16.

The expansion motor 27 is provided at the front end portion of the honing main body portion 25. The drive shaft of the expansion motor 27 is connected to the rod body 23a of the expansion rod 23 so that the expansion rod 23 housed in the honing spindle 22 reciprocates in the Z-axis direction inside the honing main body 25. .. The operation of the expansion motor 27 is controlled by the control unit 40.

The rotary motor 28 is provided in the honing main body 25. The rotary motor 28 is connected to the main shaft main body 22a so that the main shaft main body 22a of the honing main shaft 22 rotates on its axis. When the rotary motor 28 rotationally drives the spindle body 22a of the honing spindle 22, the rotational force is transmitted to the intermediate shaft portion 22b of the honing spindle 22 by the floating mechanism 24, and the grindstone holder 22c formed at the lower end of the intermediate shaft portion 22b. Rotates around the center line Z2. A plurality of honing grindstones 21 are mounted on the grindstone holder 22c. Therefore, due to the rotation of the grindstone holder 22c, the plurality of honing grindstones 21 revolve around the grindstone center line Z2 that coincides with the center line Z2 of the grindstone holder 22c.

The center line Z2 of the grindstone holder 22c constitutes the rotation axis of the grindstone holder 22c according to the present invention. In the present embodiment, the honing portion 20 is configured such that the center line Z2 of the grindstone holder 22c and the center line Z1 of the grinding wheel 11 of the grinding portion 10 are arranged in parallel. In the present embodiment, the center line Z2 of the grindstone holder 22c and the center line Z1 of the grinding wheel 11 of the grinding unit 10 are arranged in the X-axis direction and at the same position in the Y-axis direction. Further, the center line Z2 of the grindstone holder 22c and the center line Z1 of the grinding wheel 11 of the grinding unit 10 are located between the center lines of the four cylinder portions C whose X-axis directions are arranged in a line at equal intervals in the work W. It is provided so as to be equal to twice the distance (distance between the center lines of the first cylinder portion C1 and the third cylinder portion C3, which will be described later).

The Z-axis motor 29 is provided on the honing column 4. The Z-axis motor 29 is connected to the honing main body 25 so that the honing main body 25 reciprocates along the Z-axis guide 26 in the Z-axis direction. When the Z-axis motor 29 moves the honing main body 25 up and down, the honing spindle 22 and the expansion rod 23 rotatably held by the honing main body 25 move up and down, and the honing head 20a moves up and down.

<Work transport unit>
The work transfer unit 30 includes an X-axis guide 31, an X-axis table 32, a Y-axis guide 33, a work table 34, an X-axis motor 35, and a Y-axis motor 36.

The X-axis guide 31 is a long member provided on the upper surface of the bed 2 and extending long in the X-axis direction. In the present embodiment, the X-axis guide 31 is formed of a rectangular plate-like body that is long in the X-axis direction. The X-axis guide 31 is formed from one end to the other end of the bed 2 in the X-axis direction. The X-axis guide 31 may have any shape as long as it guides the movement of the X-axis table 32 in the X-axis direction. The X-axis guide 31 may be formed by two rails.

The X-axis table 32 is formed in a rectangular cuboid shape, is provided above the X-axis guide 31, and has a lower surface that meshes with the X-axis guide 31. The X-axis table 32 is configured to be movable in the X-axis direction by the X-axis guide 31. The X-axis table 32 is provided with a Y-axis motor 36 that drives the work table 34.

The Y-axis guide 33 is a long member provided on the upper surface of the X-axis table 32 and extending long in the Y-axis direction. In the present embodiment, the X-axis guide 31 is formed of a rectangular plate-like body that is long in the X-axis direction. The Y-axis guide 33 is formed from one end to the other end of the X-axis table 32 in the Y-axis direction. The Y-axis guide 33 may have any shape as long as it guides the movement of the work table 34 in the Y-axis direction. The Y-axis guide 33 may be formed by two rails.

The work table 34 is formed in a rectangular cuboid shape, is provided above the Y-axis guide 33, and has a lower surface that meshes with the Y-axis guide 33. The work table 34 is configured to be movable in the Y-axis direction by the Y-axis guide 33. Further, although not shown, the upper surface of the work table 34 is configured so that the bottom portion of the work W can be fitted so that the work W can be held. With such a configuration, the work table 34 moves the work W in the Y-axis direction by reciprocating in the Y-axis direction.

The X-axis motor 35 is provided on the bed 2. The X-axis motor 35 is connected to the X-axis table 32 so that the X-axis table 32 reciprocates in the X-axis direction. When the X-axis table 32 is moved in the X-axis direction by the X-axis motor 35, the work table 34 provided on the X-axis table 32 is moved in the X-axis direction, and the work W held in the work table 34 is X. It will move in the axial direction.

The Y-axis motor 36 is provided on the X-axis table 32. The Y-axis motor 36 is connected to the work table 34 so that the work table 34 reciprocates in the Y-axis direction. When the work table 34 is moved in the Y-axis direction by the Y-axis motor 36, the work W held in the work table 34 is moved in the Y-axis direction.

<Control unit>
The control unit 40 controls the operation of various devices of the inner peripheral surface processing device 1, and is housed inside the bed 2. In the present embodiment, the control unit 40 includes the rotation motor 17 and the Z-axis motor 18 of the grinding unit 10, the expansion motor 27 of the honing processing unit 20, the rotary motor 28 and the Z-axis motor 29, and the X-axis motor of the work transfer unit 30. It controls the operation of the 35 and the Y-axis motor 36. In the present embodiment, the control unit 40 executes inner peripheral surface machining control in which the inner peripheral surfaces C0 of the four cylinder portions C of the work W are subjected to grinding and then honing in the order of arrangement of the cylinder portions C. It is configured to do. The control unit 40 is composed of software such as a computer and a program implemented therein. The control unit 40 is electrically connected to the motors of the grinding unit 10, the honing unit 20, and the work transfer unit 30, and the speed of each of the motors during grinding, honing, and moving the work W. And position, operation timing, etc. are numerically controlled.

-Inner peripheral surface machining operation (inner peripheral surface machining method)-
Next, the inner peripheral surface processing operation (inner peripheral surface processing method) on the work W by the inner peripheral surface processing apparatus 1 will be described. In the present embodiment, the inner peripheral surface processing device 1 is used in an engine block manufacturing line used for an engine of an automobile or the like, and an engine block having four cylinder portions C arranged in a line at equal intervals is processed (work W). ) Will be described.

For convenience of explanation, the four cylinder portions C arranged in a row in the X-axis direction in FIG. 5 are arranged in this order from the right side to the left side in the X-axis direction, in order from the first cylinder portion C1, the second cylinder portion C2, and the third cylinder portion C3. , Called the fourth cylinder portion C4.

Work W is sequentially carried into the inner peripheral surface processing apparatus 1. The control unit 40 controls the operations of the grinding unit 10, the honing unit 20, and the work transfer unit 30, so that the cylinder unit C has a cylinder unit C with respect to the inner peripheral surfaces C0 of the four cylinder units C of the carried-in work W. The inner peripheral surface machining control that performs grinding and honing in the order of arrangement, that is, the first cylinder portion C1, the second cylinder portion C2, the third cylinder portion C3, and the fourth cylinder portion C4 is executed.

<Inner peripheral surface machining control>
The control unit 40 controls the operation of each motor of the work transfer unit 30 to move the work W held on the work table 34 into the carry-in / out position, the first machining position, the second machining position, the third machining position, and the first. The work transfer operation of moving the 4th machining position, the 5th machining position, and the 6th machining position in this order is repeated. Further, the control unit 40 controls the operation of each motor of the grinding unit 10 and each motor of the work transport unit 30 when the work W is in the first to fourth processing positions, and controls each cylinder unit of the work W. C is made to perform a grinding operation for grinding the inner peripheral surface C0. Further, the control unit 40 controls the operation of each motor of the honing processing unit 20 when the work W is in the third to sixth processing positions, and the inner peripheral surface C0 with respect to each cylinder portion C of the work W. Perform a honing operation to polish the cylinder. Hereinafter, detailed control by the control unit 40 will be described for each operation.

[Work transfer operation control]
First, the control unit 40 controls the operations of the X-axis motor 35 and the Y-axis motor 36 of the work transfer unit 30 to move the work W held on the work table 34 to the loading / unloading position (see FIG. 5). .. The carry-in / out position is a position where the work W is carried in / out by a work exchange device (not shown). In the present embodiment, as shown in FIG. 5, the X-axis table 32 is near the left end of the X-axis guide 31, and the work table 34 is near the front end of the Y-axis guide 33 on the X-axis table 32. At one point, the work W is placed at the loading / unloading position. At this position, the processed work W on the work table 34 is removed by a work changing device (not shown), and the unprocessed work W is supplied on the work table 34.

Next, the control unit 40 controls the operations of the X-axis motor 35 and the Y-axis motor 36 of the work transfer unit 30 to move the work W from the first machining position to the sixth machining position in order (FIGS. 6 to 6). 11).

Specifically, the control unit 40 first moves the work W from the loading / unloading position to the first machining position (see FIGS. 5 to 6). As shown in FIG. 6, the first processing position is the grinding of the first cylinder portion C1 in which the first cylinder portion C1 faces the grinding wheel 11 and the inner peripheral surface C0 of the first cylinder portion C1 is ground. The processing position. In the present embodiment, at the first processing position, the center line ZC of the inner peripheral surface C0 of the first cylinder portion C1 and the center line Z1 of the grinding wheel 11 coincide with each other. As shown in FIGS. 5 to 6, the control unit 40 moves the work table 34 to the rear side along the Y-axis guide 33 and moves the X-axis table 32 to the right side along the X-axis guide 31. , The work W is moved from the loading / unloading position to the first processing position. After the work W is transferred to the first processing position, the control unit 40 causes the grinding unit 10 and the work transfer unit 30 to perform a grinding operation to grind the inner peripheral surface C0 of the first cylinder unit C1.

When the grinding process of the inner peripheral surface C0 of the first cylinder unit C1 is completed, the control unit 40 moves the work W from the first processing position to the second processing position (see FIGS. 6 to 7). As shown in FIG. 7, the second processing position is the grinding of the second cylinder portion C2 in which the second cylinder portion C2 faces the grinding wheel 11 and the inner peripheral surface C0 of the second cylinder portion C2 is ground. The processing position. In the present embodiment, at the second processing position, the center line ZC of the inner peripheral surface C0 of the second cylinder portion C2 and the center line Z1 of the grinding wheel 11 coincide with each other. As shown in FIGS. 6 to 7, the control unit 40 moves the work W by the distance between the center lines of the cylinder units C adjacent to each other to the right along the X-axis guide 31. Move from the 1st machining position to the 2nd machining position. After the work W is transferred to the second processing position, the control unit 40 causes the grinding unit 10 and the work transfer unit 30 to perform a grinding operation to grind the inner peripheral surface C0 of the second cylinder portion C2.

When the grinding process of the inner peripheral surface C0 of the second cylinder unit C2 is completed, the control unit 40 moves the work W from the second processing position to the third processing position (see FIGS. 7 to 8). As shown in FIG. 8, the third processing position is the grinding of the third cylinder portion C3 in which the third cylinder portion C3 faces the grinding wheel 11 and the inner peripheral surface C0 of the third cylinder portion C3 is ground. A first cylinder portion in which the first cylinder portion C1 faces the grindstone holder 22c on which a plurality of honing grindstones 21 are radially mounted, and the inner peripheral surface C0 of the first cylinder portion C1 is subjected to honing processing. This is the honing processing position of C1. In the present embodiment, at the third machining position, the center line ZC of the inner peripheral surface C0 of the third cylinder portion C3 and the center line Z1 of the grinding wheel 11 coincide with each other, and the center of the inner peripheral surface C0 of the first cylinder portion C1. The line ZC and the center line of the spindle body 22a coincide with each other. As shown in FIGS. 7 to 8, the control unit 40 moves the work table 34 by the distance between the center lines of the adjacent cylinder units C to the right along the X-axis guide 31. Move from the second machining position to the third machining position. After the work W is transferred to the third processing position, the control unit 40 causes the grinding unit 10 and the work transfer unit 30 to perform a grinding operation to grind the inner peripheral surface C0 of the third cylinder unit C3, and honing. The processing portion 20 is made to perform a honing processing operation to polish the inner peripheral surface C0 of the first cylinder portion C1.

When the grinding process of the inner peripheral surface C0 of the third cylinder portion C3 and the honing process of the inner peripheral surface C0 of the first cylinder portion C1 are completed, the control unit 40 moves the work W from the third processing position to the fourth processing position. (See FIGS. 8 to 9). As shown in FIG. 9, the fourth processing position is the grinding of the fourth cylinder portion C4 in which the fourth cylinder portion C4 faces the grinding wheel 11 and the inner peripheral surface C0 of the fourth cylinder portion C4 is ground. A second cylinder portion in which the second cylinder portion C2 faces the grindstone holder 22c on which a plurality of honing grindstones 21 are radially mounted, and the inner peripheral surface C0 of the second cylinder portion C2 is subjected to honing processing. This is the honing processing position of C2. In the present embodiment, at the fourth machining position, the center line ZC of the inner peripheral surface C0 of the fourth cylinder portion C4 and the center line Z1 of the grinding wheel 11 coincide with each other, and the center of the inner peripheral surface C0 of the second cylinder portion C2. The line ZC and the center line of the spindle body 22a coincide with each other. As shown in FIGS. 8 to 9, the control unit 40 moves the work table 34 by the distance between the center lines of the adjacent cylinder units C to the right along the X-axis guide 31. Move from the 3rd processing position to the 4th processing position. After the work W is transferred to the fourth processing position, the control unit 40 causes the grinding unit 10 and the work transfer unit 30 to perform a grinding operation to grind the inner peripheral surface C0 of the fourth cylinder unit C4, and honing. The machining portion 20 is made to perform a honing machining operation to polish the inner peripheral surface C0 of the second cylinder portion C2.

When the grinding process of the inner peripheral surface C0 of the fourth cylinder portion C4 and the honing process of the inner peripheral surface C0 of the second cylinder portion C2 are completed, the control unit 40 moves the work W from the fourth processing position to the fifth processing position. (See FIGS. 9 to 10). As shown in FIG. 10, the fifth processing position is such that the third cylinder portion C3 faces the grindstone holder 22c on which a plurality of honing grindstones 21 are radially mounted, and honing is performed on the inner peripheral surface C0 of the third cylinder portion C3. This is the honing position of the third cylinder portion C3 to which is applied. In the present embodiment, at the fifth processing position, the center line ZC of the inner peripheral surface C0 of the third cylinder portion C3 and the center line of the spindle main body 22a coincide with each other. As shown in FIGS. 9 to 10, the control unit 40 moves the work table 34 by the distance between the center lines of the adjacent cylinder units C to the right along the X-axis guide 31. Move from the 4th machining position to the 5th machining position. After the work W is transferred to the fifth machining position, the control section 40 causes the honing machining section 20 to perform a honing machining operation to polish the inner peripheral surface C0 of the third cylinder section C3.

When the honing process of the inner peripheral surface C0 of the third cylinder unit C3 is completed, the control unit 40 moves the work W from the fifth processing position to the sixth processing position (see FIGS. 10 to 11). As shown in FIG. 11, in the sixth machining position, the fourth cylinder portion C4 faces the grindstone holder 22c on which a plurality of honing grindstones 21 are radially mounted, and honing is performed on the inner peripheral surface C0 of the fourth cylinder portion C4. This is the honing processing position of the fourth cylinder portion C4 to which is applied. In the present embodiment, at the sixth processing position, the center line ZC of the inner peripheral surface C0 of the fourth cylinder portion C4 and the center line of the spindle main body 22a coincide with each other. As shown in FIGS. 10 to 11, the control unit 40 moves the work table 34 by the distance between the center lines of the adjacent cylinder units C to the right along the X-axis guide 31. Move from the 5th machining position to the 6th machining position. After the work W is transferred to the sixth machining position, the control section 40 causes the honing machining section 20 to perform a honing machining operation to polish the inner peripheral surface C0 of the fourth cylinder section C4.

When the honing process of the inner peripheral surface C0 of the fourth cylinder portion C4 is completed, the control unit 40 controls the operations of the X-axis motor 35 and the Y-axis motor 36 of the work transfer unit 30 and is held on the work table 34. The work W is moved to the loading / unloading position (see FIG. 5). In the present embodiment, the X-axis table 32 is moved along the X-axis guide 31 to the vicinity of the left end portion, and the work table 34 is moved along the Y-axis guide 33 to the vicinity of the front end portion on the X-axis table 32. By moving the work W, the work W is moved from the sixth processing position to the loading / unloading position.

As described above, the work W held on the work table 34 is moved to the carry-in / out position, the first machining position, the second machining position, and the third machining by the operation control of each motor of the work transfer section 30 by the control section 40. The work transfer operation of moving in the order of the position, the fourth machining position, the fifth machining position, and the sixth machining position is repeatedly performed.

[Grinding operation control]
The control unit 40 is arranged at the grinding position by the work transfer unit 30, and the rotating motors 17 and Z of the grinding unit 10 with respect to the cylinder units C (first to fourth cylinder units C1 to C4) to be ground. The shaft motor 18 is operated to rotate the grinding wheel 11 to advance into the cylinder portion C, and the X-axis motor 35 and the Y-axis motor 36 of the workpiece transfer section 30 are operated to cause the grinding wheel 11 to move into the cylinder portion C. The work W is displaced so as to relatively rotate while abutting on the inner peripheral surface C0 of the cylinder portion C, and the inner peripheral surface C0 of the cylinder portion C is ground.

Specifically, the control unit 40 operates the rotation motor 17 to rotate (rotate) the grinding wheel 11 around the center line Z1 and operates the Z-axis motor 18 to move the grinding table 15 to the grinding wheel 11. The grinding wheel 11 is moved downward in the Z-axis direction from a predetermined standby position above the upper surface of the work W to a grinding position located in the cylinder portion C. That is, the grinding wheel 11 is advanced into the cylinder portion C while rotating on its axis.

Further, the control unit 40 operates the X-axis motor 35 and the Y-axis motor 36 to displace the work W so that the inner peripheral surface C0 of the cylinder portion C to be ground is in contact with the outer peripheral surface of the grinding wheel 11. Further, the work W is displaced so that the center line ZC of the cylinder portion C to be grounded rotates around the center line Z1 of the grinding wheel 11. As the work W is displaced in the X-axis direction and the Y-axis direction in this way, the grinding wheel 11 is not displaced in the X-axis direction and the Y-axis direction, but apparently inside the cylinder portion C, the inner peripheral surface C0 It will rotate and move along the inner peripheral surface C0 while abutting against.

Further, the control unit 40 operates the Z-axis motor 18 at the same time as the rotation motor 17 to reciprocate the grinding table 15 along the Z-axis guide 16 in the Z-axis direction. As a result, the grinding wheel 11 moves up and down in the Z-axis direction.

Due to the grinding operation including the rotation operation of the grinding wheel 11, the displacement of the work W in the X and Y axes, and the vertical movement of the grinding wheel 11, the grinding wheel 11 is inside the cylinder portion C to be ground. The work W is displaced so as to rotate while abutting on the peripheral surface C0 and apparently rotate along the inner peripheral surface C0 of the cylinder portion C to be ground. The inner peripheral surface C0 of the cylinder portion C is ground by the grinding wheel 11.

When the grinding of the inner peripheral surface C0 of the cylinder portion C to be grounded is completed at each grinding position, the control unit 40 operates the X-axis motor 35 and the Y-axis motor 36 to move the work W to the original position (each). Return to the position where the center line ZC of the inner peripheral surface C0 of the cylinder portion C and the center line Z1 of the grinding wheel 11 coincide with each other), and operate the Z-axis motor 18 to move the grinding table 15 from the grinding position to the standby position in the Z-axis direction. Move to the upper side of.

[Honing operation control]
The control unit 40 is arranged at the honing processing position by the work transfer unit 30, and the expansion motor 27 of the honing processing unit 20 rotates with respect to the cylinder units C (first to fourth cylinder units C1 to C4) to be honing processed. By operating the motor 28 and the Z-axis motor 29 to advance the grindstone holder 22c to which a plurality of honing grindstones 21 are radially mounted into the inside of the cylinder portion C and rotate the grindstone holder 22c, the inner peripheral surface C0 of the cylinder portion C is polished. do.

Specifically, the control unit 40 first operates the Z-axis motor 29 to operate the honing main body 25, and the honing head 20a is a cylinder unit from a predetermined standby position where the honing head 20a is above the upper surface of the work W. It is moved downward in the Z-axis direction to the honing position located in C. That is, the grindstone holder 22c in which a plurality of honing grindstones 21 are radially mounted is advanced inside the cylinder portion C. At this time, the expansion motor 27 does not operate, and the grindstone diameter R (diameter of the circumscribed circle of the plurality of grindstone pieces 21a) of the honing portion 20 is the minimum value.

Next, the control unit 40 expands the expansion motor 27 so that the grindstone diameter R (diameter of the circumscribed circle of the plurality of grindstone pieces 21a) of the honing portion 20 becomes equal to the diameter of the inner peripheral surface C0 of the cylinder portion C. Control the operation of.

At this time, even if the center line ZC of the inner peripheral surface C0 of the cylinder portion C and the grindstone center line Z2 of the honing machined portion 20 are deviated due to an alignment error, thermal deformation of the cylinder portion C, or the like, the grindstone of the honing machined portion 20 When the diameter R is expanded, the floating mechanism 24 causes the grindstone piece 21a located in the direction in which the grindstone centerline Z2 deviates from the centerline ZC abuts on the inner peripheral surface C0 of the cylinder portion C, and due to the reaction thereof. A force acts on the grindstone holder 22c on which the honing grindstone 21 is mounted in a direction in which the grindstone center line Z2 coincides with the center line ZC. As a result, the intermediate shaft portion 22b of the honing main shaft 22 is displaced in the direction of the force acting on the grindstone holder 22c, and the grindstone center line Z2 coincides with the center line ZC.

Further, the control unit 40 operates the rotary motor 28 to rotationally drive the spindle body 22a of the honing spindle 22. When the rotary motor 28 rotationally drives the spindle body 22a of the honing spindle 22, the rotational force is transmitted to the intermediate shaft portion 22b of the honing spindle 22 by the floating mechanism 24, and the intermediate shaft portion 22b rotates (rotates), and the intermediate shaft portion 22b rotates (rotates). The grindstone holder 22c connected to the lower end of the shaft portion 22b also rotates (rotates). As a result, the plurality of honing grindstones 21 mounted on the grindstone holder 22c revolve around the grindstone center line Z2.

Further, the control unit 40 operates the Z-axis motor 29 to reciprocate the honing main body 25 along the Z-axis guide 26 in the Z-axis direction. As a result, the honing spindle 22 and the expansion rod 23 rotatably held by the honing main body 25 move up and down, and the honing head 20a composed of the lower end of the rod main body 23a, the grindstone holder 22c, and the plurality of honing grindstones 21. Moves up and down in the Z-axis direction.

Due to the revolving motion of the plurality of honing grindstones 21 and the honing processing operation consisting of the vertical movement of the honing head 20a including the honing grindstone 21 as described above, the inner peripheral surface C0 of the cylinder portion C is formed by the plurality of honing grindstones 21 of the honing head 20a. Polished (honed).

When the polishing (honing processing) of the inner peripheral surface C0 of the cylinder portion C to be honing is completed at each honing processing position, the control unit 40 operates the Z-axis motor 29 to wait for the honing main body 25 from the honing position. Move to the upper side in the Z-axis direction to the position.

By the inner peripheral surface machining control by the control unit 40 as described above, the work W is subjected to the loading / unloading position, the first machining position, the second machining position, the third machining position, and the fourth by the work transfer operation by the work transfer section 30. The processing position, the fifth processing position, and the sixth processing position are repeatedly arranged in this order.

When the work W is in the first machining position, only the inner peripheral surface C0 of the first cylinder section C1 is ground by the grinding operation by the grinding section 10 and the work transfer section 30. Further, when the work W is in the second machining position, only the inner peripheral surface C0 of the second cylinder section C2 is ground by the grinding operation by the grinding section 10 and the work transfer section 30.

On the other hand, when the work W is in the third machining position, the grinding operation by the grinding section 10 and the work transfer section 30 performs grinding on the inner peripheral surface C0 of the third cylinder section C3, and the honing section 20 performs grinding. By the honing operation, the honing process on the inner peripheral surface C0 of the first cylinder portion C1 is performed in parallel with the grinding process. Further, even when the work W is in the fourth machining position, the grinding operation by the grinding section 10 and the work transfer section 30 performs grinding on the inner peripheral surface C0 of the fourth cylinder section C4, and the honing section. By the honing operation by 20, the honing process on the inner peripheral surface C0 of the second cylinder portion C2 is performed in parallel with the grinding process.

Then, when the work W is in the fifth processing position, only the honing processing on the inner peripheral surface C0 of the third cylinder portion C3 is performed by the honing processing operation by the honing processing unit 20. Further, even when the work W is in the sixth machining position, only honing machining is performed on the inner peripheral surface C0 of the fourth cylinder section C4 by the honing machining operation by the honing machining section 20.

That is, due to the inner peripheral surface machining control by the control unit 40, the four cylinder portions C1 to C4 of the work W are arranged in the order of arrangement (first cylinder portion C1, second cylinder portion C2, third cylinder portion C3, fourth cylinder). The grinding and honing positions are arranged in this order (in the order of the parts C4), and the grinding and honing are performed in order on the inner peripheral surfaces C0 of the four cylinder parts C1 to C4 in the order of their arrangement. Further, when the work W is in the third machining position, the grinding process on the inner peripheral surface C0 of the third cylinder portion C3 and the grinding process on the inner peripheral surface C0 of the first cylinder portion C1 are performed in parallel (FIG. 8). When the work W is in the fourth machining position, the grinding process on the inner peripheral surface C0 of the fourth cylinder portion C4 and the grinding process on the inner peripheral surface C0 of the second cylinder portion C2 are performed in parallel (see). See FIG. 9).

As described above, when the work W is in the third and fourth machining positions, the grinding operation by the grinding section 10 and the work transfer section 30 and the honing operation by the honing section 20 are performed at the same time.

Here, in the grinding operation using the grinding wheel 11 having a diameter smaller than the inner diameter of the cylinder portion C, the grinding wheel 11 apparently rotates along the inner peripheral surface C0 while abutting on the inner peripheral surface C0 of the cylinder portion C. It is necessary to displace the work W by the work transport portion 30 so as to move, but in the honing operation, a state in which a plurality of grindstone pieces 21a mounted on the grindstone holder 22c are in contact with the inner peripheral surface C0 of the cylinder portion C. When the work W is displaced in order to rotate the grindstone holder 22c, the center line ZC of the cylinder portion C and the grindstone center line Z2 of the honing portion 20 (the center line of the cylinder circumscribing the plurality of grindstone pieces 21a) deviate from each other. , There is a risk of causing uneven wear of the grindstone piece 21a.

However, according to the inner peripheral surface processing device 1, the honing processing unit 20 is provided with a floating mechanism 24. As described above, the floating mechanism 24 holds the intermediate shaft portion 22b in a predetermined range so as to be displaceable in the horizontal direction, and the spindle main body 22a rotates so that the intermediate shaft portion 22b rotates in conjunction with the rotation of the spindle main body 22a. Is configured to transmit the rotational force of the above to the intermediate shaft portion 22b. Therefore, when performing a grinding operation and a honing operation that accompany the displacement of the work W on different cylinder portions C of the same work W, the cylinder portions C (first and first and) that are subject to honing due to the displacement of the work W. Even if the second cylinder portions C1 and C2) are displaced, the grindstone holder 22c connected to the lower end of the intermediate shaft portion 22b follows the displacement of the cylinder portion C by the floating mechanism 24. Therefore, according to the inner peripheral surface processing apparatus 1, the center line ZC of the cylinder portion C to be honing and the grindstone center line Z2 of the honing portion 20 (the center line of the cylinder circumscribing the plurality of grindstone pieces 21a). It is possible to suppress the occurrence of uneven wear of the grindstone piece 21a without slipping.

-Effect of Embodiment 1-
As described above, according to the first embodiment, the inner peripheral surface processing device 1 for processing the inner peripheral surface C0 of the cylinder portion C of the work W rotates the grinding wheel 11 around the center line Z1 to rotate the grinding grind 11 around the center line Z1. The grinding section 10 that grinds the inner peripheral surface C0 of the cylinder portion C and the grindstone holder 22c to which a plurality of honing grinds 21 are radially mounted are rotated around the center line Z2 to grind the inner peripheral surface C0 of the cylinder portion C. A work transfer unit (moving mechanism) 30 that arranges the portion 20 and each cylinder portion C at a grinding processing position facing the grinding wheel 11 and a honing processing position facing the grinding wheel holder 22c, and a grinding processing unit 10 and a honing processing unit. It is configured to include 20 and a control unit 40 that controls the operation of the work transfer unit 30. In the inner peripheral surface processing device 1, each cylinder portion C of the work W is first arranged at the grinding processing position by the work transport portion 30 by the inner peripheral surface processing control by the control unit 40, and the inner peripheral surface C0 is ground. After being subjected to the honing process, the work transfer portion 30 arranges the honing process position and the inner peripheral surface C0 is subjected to the honing process. That is, according to the inner peripheral surface processing device 1, the grinding process and the honing process of the inner peripheral surface C0 of the cylinder portion C can be performed by one processing device. Since the roughing process to the finishing process can be performed by one processing device in this way, the inner peripheral surface C0 of the cylinder portion C is processed as compared with the case where the grinding device and the honing device are separately provided. The inner peripheral surface processing system can be compactly configured with one processing device. Further, when the inner peripheral surface machining system is configured by a plurality of devices, the machining time required for the inner peripheral surface machining becomes longer as the distance for moving the work W for honing after grinding becomes longer. However, according to the inner peripheral surface processing device 1, since the grinding process and the honing process can be performed by one processing device, the transition from the grinding process to the honing process becomes smooth and the processing time can be shortened. ..

Further, in the inner peripheral surface processing device 1 and the inner peripheral surface processing method of the first embodiment, grinding processing is performed on the inner peripheral surface C0 of the cylinder portion C of the work W instead of the conventional cutting processing. There is. Here, the grinding wheel 11 is cheaper than the cutting tool, and even if the difficult-to-cut material is processed and worn, it can be used continuously until the grinding wheel itself disappears, so that the life of the grinding wheel 11 is longer than that of the cutting tool. Therefore, according to the inner peripheral surface processing apparatus 1 and the inner peripheral surface processing method, the cost (particularly, tool cost) required for the inner peripheral surface processing is reduced by performing grinding processing instead of the conventional cutting processing. can do. Further, according to the inner peripheral surface processing apparatus 1 and the inner peripheral surface processing method, the cutting tool is worn as in the conventional technique of performing the cutting process before the honing process by performing the grinding process before the honing process. It is not difficult to control the inner diameter of the cylinder portion C due to chipping or chipping. Therefore, since the machining allowance in honing processing fluctuates, the processing quality and processing time do not vary, and it is possible to suppress a decrease in processing quality and yield.

Further, in the present embodiment, the center line Z1 of the grinding wheel 11 and the center line Z2 of the grindstone holder 22c are arranged in parallel. Then, the grinding portion 10 and the honing processing portion 20 and the work W are relatively moved to arrange each cylinder portion C at the grinding processing position facing the grinding wheel 11 and the honing processing position facing the grinding wheel holder 22c. By moving the work W by the work transport portion constituting the moving mechanism, each cylinder portion is transported to the grinding processing position and the honing processing position. As described above, the moving mechanism can be easily configured by forming the moving mechanism by the work transporting unit 30 that moves the work W instead of moving the grinding part 10 and the honing part 20 having a complicated structure. can.

Further, in the present embodiment, the work W is sent to the work transfer portion 30 in the arrangement direction of the plurality of cylinder portions C, and the plurality of cylinder portions C are grounded in the order of arrangement (first to fourth machining positions) and honing. They are arranged in order at the positions (third to sixth machining positions), and grinding and honing are sequentially performed on the inner peripheral surfaces C0 of the plurality of cylinder portions C in the order of their arrangement. Therefore, according to the inner peripheral surface processing device 1, even if the work W has a plurality of cylinder portions C, the grinding process and the honing process of the inner peripheral surface C0 of the plurality of cylinder portions C can be performed by one processing device. It can be carried out.

Further, in the inner peripheral surface processing apparatus 1 of the present embodiment, the work W having four cylinder portions C1 to C4 arranged in a row at equal intervals is targeted for processing, and the arrangement order of the four cylinder portions C1 to C4, that is, the first Grinding and honing are sequentially performed on the inner peripheral surface C0 in the order of 1 cylinder portion C1, 2nd cylinder portion C2, 3rd cylinder portion C3, and 4th cylinder portion C4. Further, in the inner peripheral surface processing apparatus 1, when the work W is sent in the arrangement direction of the four cylinder portions C1 to C4 and the first cylinder portion C1 is arranged at the honing processing position facing the grindstone holder 22c. The third cylinder portion C3 is arranged at the grinding position facing the grinding wheel 11, and similarly, the work W is sent in the arrangement direction of the four cylinder portions C1 to C4 to be sent to the second cylinder portion. When C 2 is arranged at the honing processing position facing the grinding wheel holder 22c, the fourth cylinder portion C 4 is arranged at the grinding processing position facing the grinding wheel 11.

In the present embodiment, based on such a configuration, the grinding process on the inner peripheral surface C0 of the third cylinder portion C3 and the honing process on the inner peripheral surface C0 of the first cylinder portion C1 are performed in parallel, and the fourth cylinder portion C4 The grinding process on the inner peripheral surface C0 and the honing process on the inner peripheral surface C0 of the second cylinder portion C2 are performed in parallel. As described above, according to the inner peripheral surface processing apparatus 1 and the inner peripheral surface processing method, honing processing is not performed on the inner peripheral surfaces C0 of the four cylinder portions C1 to C4 after all the grinding processing is completed. By performing the grinding process and the honing process on a part of the cylinder portions C in parallel, the time required for processing the inner peripheral surfaces C0 of the four cylinder portions C1 to C4 can be shortened.

<< 2nd Embodiment of the Invention >>
The inner peripheral surface processing device 1 according to the second embodiment is a partially modified configuration of the inner peripheral surface processing device 1 according to the first embodiment. The inner peripheral surface processing operation (inner peripheral surface processing method) performed by the inner peripheral surface processing device 1 according to the second embodiment is also the inner peripheral surface processing operation (inner peripheral surface processing method) performed by the inner peripheral surface processing device 1 according to the first embodiment. Processing method) is partially different. Although the detailed configuration will be described later, the inner peripheral surface processing device 1 according to the second embodiment has a mechanism (X) for moving the work W provided in the inner peripheral surface processing device 1 according to the first embodiment in the Y-axis direction. A mechanism (X-axis table 51, X-axis guide 52 and X-axis motor 53) for moving the grinding wheel 11 in the X-axis direction, omitting the shaft table 32, the Y-axis guide 33 and the Y-axis motor 36), and the grinding wheel 11 Is added with a mechanism (Y-axis table 61, Y-axis guide 62, and Y-axis motor 63) for moving the vehicle in the Y-axis direction.

In the following description, as shown in FIG. 12, the width direction of the inner peripheral surface processing device 1 (the direction from the left front to the right back of the paper surface) is the X-axis direction, and the depth direction of the inner peripheral surface processing device 1 (the right front of the paper surface). The direction from the left to the back is called the Y-axis direction, and the height direction of the inner peripheral surface processing device 1 (the vertical direction of the paper surface) is called the Z-axis direction. Further, the left side of the paper surface of FIG. 12 is referred to as "left side" and the right side of the paper surface is referred to as "right side" along the X-axis direction. Further, the front side of the paper surface in FIG. 12 is referred to as the "front side" and the back side of the paper surface is referred to as the "rear side" along the Y-axis direction.

-Constitution-
As shown in FIG. 12, also in the second embodiment, the inner peripheral surface processing device 1 includes the bed 2, the column 3, and the honing column 4, as in the first embodiment.

Similar to the first embodiment, the bed 2 is formed in a substantially T shape by a rectangular cuboid member 2a extending in the X-axis direction and a rectangular cuboid member 2b extending in the Y-axis direction, and is placed on a horizontal installation surface. ing. The member 2b extending in the Y-axis direction of the bed 2 on which the column 3 is erected in the first embodiment is formed wider than that of the first embodiment.

While the column 3 is composed of the same members as in the first embodiment, the column 3 is movably installed in the Y-axis direction on the member 2b extending in the Y-axis direction of the bed 2. The column 3 is configured to be movable in the Y-axis direction by the Y-axis table 61, the Y-axis guide 62, and the Y-axis motor 63 described later in the grinding unit 10.

In the first embodiment, the honing column 4 is fixed to the upper right side of the column 3, but in the second embodiment, the honing column 4 is erected immovably on the member 2b extending in the Y-axis direction of the bed 2 on the right side of the column 3. ing. That is, in the second embodiment, the honing column 4 is self-supporting without the load being supported by the column 3.

With such a configuration, the bed 2, the column 3, and the honing column 4 form a support structure for the inner peripheral surface processing device 1. Further, the inner peripheral surface processing device 1 includes a grinding unit 10, a honing unit 20, a work transfer unit (moving mechanism) 30, and a control unit 40, as in the first embodiment. Hereinafter, the configuration of each part will be described in detail.

<Grinding section>
As shown in FIG. 12, the grinding unit 10 includes the same grinding grindstone 11 as in the first embodiment, the grinding spindle 12, the grinding holder 13, the grinding main body portion 14, the grinding table 15, and the Z-axis guide 16. , A rotating motor 17, a Z-axis motor 18, an X-axis table 51, an X-axis guide 52, an X-axis motor 53, a Y-axis table 61, a Y-axis guide 62, and a Y-axis motor. It has 63 and. Since the grinding wheel 11, the grinding spindle 12, the grinding holder 13, the Z-axis guide 16, the rotation motor 17, and the Z-axis motor 18 are configured in the same manner as in the first embodiment, the description thereof will be omitted.

The grinding body portion 14 is formed in a rectangular cuboid shape, and is configured to hold the grinding holder 13 in front. In the second embodiment, the rear surface of the grinding body portion 14 is fixed to the front surface of the X-axis table 51 instead of the grinding table 15.

The grinding table 15 is formed in a rectangular cuboid-shaped box shape, and the above-mentioned X-axis guide 52 is fixed to the front surface. Further, the grinding table 15 is configured to be movable in the Z-axis direction by the Z-axis guide 16 as in the first embodiment.

The X-axis table 51 is formed in a rectangular cuboid-shaped box shape, the above-mentioned grinding body portion 14 is fixed to the front surface, and the rear surface is formed in a shape that meshes with the X-axis guide 52. The X-axis table 51 is configured to be movable in the X-axis direction by the X-axis guide 52.

The X-axis guide 52 is a member provided on the front surface of the grinding table 15 and extending in the X-axis direction. In the present embodiment, the X-axis guide 52 is composed of a rectangular plate-like body extending in the X-axis direction. The X-axis guide 52 is formed from the left end portion to the right end portion of the grinding table 15. The X-axis guide 52 may have any shape as long as it guides the movement of the X-axis table 51 in the X-axis direction.

The X-axis motor 53 is provided on the grinding table 15. The X-axis motor 53 is connected to the X-axis table 51 so that the X-axis table 51 reciprocates along the X-axis guide 52 in the X-axis direction. When the X-axis motor 53 reciprocates the X-axis table 51 in the X-axis direction, the grinding wheel 11 reciprocates in the X-axis direction via the grinding body 14, the grinding holder 13, and the grinding spindle 12.

The Y-axis table 61 is formed in a rectangular cuboid-shaped box shape, the above-mentioned column 3 is fixed to the upper surface, and the lower surface is formed in a shape that meshes with the Y-axis guide 62. The Y-axis table 61 is configured to be movable in the Y-axis direction by the Y-axis guide 62.

The Y-axis guide 62 is a member extending in the Y-axis direction provided on the upper surface of the member 2b extending in the Y-axis direction of the bed 2. In the present embodiment, the Y-axis guide 62 is composed of a rectangular plate-like body extending in the Y-axis direction. The Y-axis guide 62 is formed from the front end portion to the rear end portion of the member 2b extending in the Y-axis direction of the bed 2. The Y-axis guide 62 may have any shape as long as it guides the movement of the Y-axis table 61 in the Y-axis direction.

The Y-axis motor 63 is provided on the bed 2. The Y-axis motor 63 is connected to the Y-axis table 61 so that the Y-axis table 61 reciprocates along the Y-axis guide 62 in the Y-axis direction. When the Y-axis motor 63 reciprocates the Y-axis table 61 in the Y-axis direction, the grinding wheel 11 moves in the Y-axis direction via the column 3, the X-axis table 51, the grinding body 14, the grinding holder 13, and the grinding spindle 12. It will move back and forth.

<Honing processing section>
As shown in FIG. 12, the honing processing portion 20 includes a honing spindle 22 to which a plurality of honing grindstones 21 are attached, an expansion rod 23, a floating mechanism 24, a honing main body portion 25, and the honing main body portion 25, as in the first embodiment. It has a Z-axis guide 26, an expansion motor 27, a rotary motor 28, and a Z-axis motor 29. Since the honing processing unit 20 is configured in the same manner as in the first embodiment, detailed description thereof will be omitted.

<Work transport unit>
In the second embodiment, the work transfer unit 30 has the same X-axis guide 31 and X-axis motor 35 as in the first embodiment, but does not have the Y-axis guide 33 and the Y-axis motor 36 and meshes with the X-axis guide 31. The X-axis table is configured in the work table 34 that holds the work W.

Specifically, the work table 34 is formed in a rectangular cuboid shape, is provided above the X-axis guide 31, and has a lower surface that meshes with the X-axis guide 31. The work table 34 is configured to be movable in the X-axis direction by the X-axis guide 31. Further, although not shown, the upper surface of the work table 34 is configured so that the bottom portion of the work W can be fitted so that the work W can be held.

The X-axis motor 35 is provided on the bed 2. The X-axis motor 35 is connected to the work table 34 so that the work table 34 reciprocates in the X-axis direction. When the work table 34 is moved in the X-axis direction by the X-axis motor 35, the work W provided on the work table 34 is moved in the X-axis direction.

<Control unit>
Also in the second embodiment, the control unit 40 is housed inside the bed 2. In the second embodiment, the control unit 40 includes a rotation motor 17, a Z-axis motor 18, an X-axis motor 53 and a Y-axis motor 63 of the grinding unit 10, an expansion motor 27 of the honing unit 20, a rotary motor 28, and a Z-axis motor. 29. By controlling the operation of the X-axis motor 35 of the work transfer section 30, the inner peripheral surfaces C0 of the four cylinder sections C of the work W are ground in the order of the arrangement of the cylinder sections C, and then the honing process is performed. It is configured to execute the inner peripheral surface machining control to be applied.

-Inner peripheral surface machining operation (inner peripheral surface machining method)-
Also in the second embodiment, the inner peripheral surface processing device 1 is used in the production line of the engine block used for the engine of an automobile or the like, and the engine block having four cylinder portions C arranged in a line at equal intervals is processed (work W). ) Will be described. Hereinafter, the four cylinder portions C arranged in a row in the X-axis direction in FIG. 12 will be referred to as a first cylinder portion C1, a second cylinder portion C2, a third cylinder portion C3, and a fourth cylinder portion C4 in this order from the right side to the left side. ..

Work W is sequentially carried into the inner peripheral surface processing apparatus 1. The control unit 40 controls the operations of the grinding unit 10, the honing unit 20, and the work transfer unit 30, so that the cylinder unit C has a cylinder unit C with respect to the inner peripheral surfaces C0 of the four cylinder units C of the carried-in work W. The inner peripheral surface machining control that performs grinding and honing in the order of arrangement, that is, the first cylinder portion C1, the second cylinder portion C2, the third cylinder portion C3, and the fourth cylinder portion C4 is executed.

<Inner peripheral surface machining control>
The control unit 40 controls the operation of each motor of the work transfer unit 30 to move the work W held on the work table 34 into the carry-in / out position, the first machining position, the second machining position, the third machining position, and the first. The work transfer operation of moving the 4th machining position, the 5th machining position, and the 6th machining position in this order is repeated. Further, the control unit 40 controls the operation of each motor of the grinding unit 10 when the work W is in the first to fourth processing positions, and the inner peripheral surface C0 with respect to each cylinder portion C of the work W. To perform a grinding operation to grind. Further, the control unit 40 controls the operation of each motor of the honing processing unit 20 when the work W is in the third to sixth processing positions, and the inner peripheral surface C0 with respect to each cylinder portion C of the work W. Perform a honing operation to polish the cylinder. Hereinafter, detailed control by the control unit 40 will be described for each operation.

[Work transfer operation control]
First, the control unit 40 controls the operation of the X-axis motor 35 of the work transfer unit 30 to move the work W held on the work table 34 to the loading / unloading position (see FIG. 13). In the second embodiment, as shown in FIG. 13, when the work table 34 is near the left end portion of the X-axis guide 31, the work W is arranged at the loading / unloading position. At this position, the processed work W on the work table 34 is removed by a work changing device (not shown), and the unprocessed work W is supplied on the work table 34.

Next, the control unit 40 controls the operation of the X-axis motor 35 of the work transfer unit 30 to move the work W from the first machining position to the sixth machining position in order (see FIGS. 14 to 19). The first processing position to the sixth processing position are positions that satisfy the same requirements as in the first embodiment.

The control unit 40 first controls the operation of the X-axis motor 35 and moves the work table 34 to the right along the X-axis guide 31 to move the work W from the loading / unloading position to the first machining position. (See FIGS. 13-14). After that, the control unit 40 controls the operation of the X-axis motor 35 and moves the work table 34 to the right along the X-axis guide 31 in the same manner as in the first embodiment, thereby moving the work W from the first machining position to the right side. From the 2nd machining position (see FIGS. 14 to 15), from the 2nd machining position to the 3rd machining position (see FIGS. 15 to 16), and from the 3rd machining position to the 4th machining position (FIGS. 16 to 17). (See), the fourth machining position is moved to the fifth machining position (see FIGS. 17 to 18), and the fifth machining position is moved to the sixth machining position (see FIGS. 18 to 19). Further, in the second embodiment, the control unit 40 controls the operation of the X-axis motor 35 as in the first embodiment and moves the work table 34 along the X-axis guide 31 to the vicinity of the left end portion, thereby causing the work W. Is moved from the 6th processing position to the loading / unloading position.

As described above, the work W held on the work table 34 is moved to the loading / unloading position, the first machining position, the second machining position, and the second machining position by the operation control of the X-axis motor 35 of the work transfer section 30 by the control section 40. The work transfer operation of moving in the order of the 3 machining position, the 4th machining position, the 5th machining position, and the 6th machining position is repeatedly performed.

[Grinding operation control]
The control unit 40 is arranged at the grinding position by the work transfer unit 30 and is the rotation motor 17 and Z of the grinding unit 10 with respect to the cylinder units C (first to fourth cylinder units C1 to C4) to be ground. The shaft motor 18 is operated to rotate the grinding wheel 11 to advance into the cylinder portion C, and the X-axis motor 53 and the Y-axis motor 63 are operated so that the grinding wheel 11 rotates on the inner peripheral surface C0 of the cylinder portion C. The X-axis table 51 and the Y-axis table 61 are displaced so as to rotate while being in contact with the cylinder portion C, and the inner peripheral surface C0 of the cylinder portion C is ground.

Specifically, the control unit 40 operates the rotation motor 17 to rotate (rotate) the grinding wheel 11 around the center line Z1 and operates the Z-axis motor 18 to move the grinding table 15 to the grinding wheel 11. The grinding wheel 11 is moved downward in the Z-axis direction from a predetermined standby position above the upper surface of the work W to a grinding position located in the cylinder portion C. That is, the grinding wheel 11 is advanced into the cylinder portion C while rotating on its axis.

Further, the control unit 40 operates the X-axis motor 53 and the Y-axis motor 63 to rotate the grinding wheel 11 so that the outer peripheral surface of the grinding wheel 11 comes into contact with the inner peripheral surface C0 of the cylinder portion C to be ground. The grinding wheel 11 is displaced, and the grinding wheel 11 is displaced so as to rotate while abutting on the inner peripheral surface C0 of the cylinder portion C. By displacing the X-axis table 51 in the X-axis direction and the Y-axis table 61 in the Y-axis direction in this way, the grinding grind 11 abuts on the inner peripheral surface C0 inside the cylinder portion C and the inner circumference thereof. It will rotate and move along the surface C0.

Further, the control unit 40 operates the Z-axis motor 18 at the same time as the rotation motor 17 to reciprocate the grinding table 15 along the Z-axis guide 16 in the Z-axis direction. As a result, the grinding wheel 11 moves up and down in the Z-axis direction.

Due to the grinding operation including the rotation operation of the grinding wheel 11 and the X and Y axis displacement of the grinding wheel 11 and the vertical movement of the grinding wheel 11, the grinding wheel 11 is inside the cylinder portion C to be ground. While rotating on the inner peripheral surface C0, it rotates and moves along the inner peripheral surface C0 of the cylinder portion C, and the inner peripheral surface C0 of the cylinder portion C to be ground is ground.

When the grinding of the inner peripheral surface C0 of the cylinder portion C to be grounded is completed at each grinding position, the control unit 40 operates the X-axis motor 53 and the Y-axis motor 63 to move the grinding wheel 11 to the original position ( The center line Z1 is returned to the position corresponding to the center line ZC of the inner peripheral surface C0 of each cylinder portion C), and the Z-axis motor 18 is operated to move the grinding table 15 upward in the Z-axis direction from the grinding position to the standby position. Let me.

[Honing operation control]
The control unit 40 is arranged at the honing processing position by the work transfer unit 30, and the expansion motor 27 of the honing processing unit 20 rotates with respect to the cylinder units C (first to fourth cylinder units C1 to C4) to be honing processed. By operating the motor 28 and the Z-axis motor 29 to advance the grindstone holder 22c to which a plurality of honing grindstones 21 are radially mounted into the inside of the cylinder portion C and rotate the grindstone holder 22c, the inner peripheral surface C0 of the cylinder portion C is polished. do. Since the honing operation operation control is the same as that of the first embodiment, the description thereof will be omitted.

Due to the inner peripheral surface machining control by the control unit 40 as described above, even in the second embodiment, the work W is subjected to the loading / unloading position, the first machining position, the second machining position, and the second machining position by the work transfer operation by the work transfer unit 30. The 3 machining positions, the 4th machining position, the 5th machining position, and the 6th machining position are repeatedly arranged in this order. Then, due to the grinding operation by the grinding unit 10, when the work W is in the first to fourth processing positions, the inner peripheral surface C0 of the first cylinder portion C1 to the fourth cylinder portion C4 is ground. Further, due to the honing operation by the honing unit 20, when the work W is in the third to sixth processing positions, honing processing is performed on the inner peripheral surface C0 of the first cylinder portion C1 to the fourth cylinder portion C4.

That is, also in the second embodiment, the four cylinder portions C1 to C4 of the work W are arranged in the order of arrangement (first cylinder portion C1, second cylinder portion C2, third cylinder) by the inner peripheral surface machining control by the control unit 40. Grinding and honing positions are arranged in order in the parts C3 and the fourth cylinder part C4), and the grinding and honing are performed in the order of arrangement with respect to the inner peripheral surfaces C0 of the four cylinder parts C1 to C4. It is done in order. Further, when the work W is in the third machining position, the grinding process on the inner peripheral surface C0 of the third cylinder portion C3 and the grinding process on the inner peripheral surface C0 of the first cylinder portion C1 are performed in parallel (FIG. 16). When the work W is in the fourth machining position, the grinding process on the inner peripheral surface C0 of the fourth cylinder portion C4 and the grinding process on the inner peripheral surface C0 of the second cylinder portion C2 are performed in parallel (see). See FIG. 17).

As described above, also in the second embodiment, when the work W is in the third and fourth processing positions, the grinding operation by the grinding unit 10 and the honing operation by the honing unit 20 are performed at the same time. In the second embodiment, the work W is not displaced during the grinding operation. Therefore, when the grinding operation and the honing operation are performed in parallel, the center line ZC of the cylinder portion C to be honing and the grindstone center line Z2 of the honing portion 20 (a cylinder externally attached to a plurality of grindstone pieces 21a). The center line) does not deviate due to the displacement of the work W due to the grinding operation, the occurrence of uneven wear of the grindstone piece 21a can be suppressed, and high-precision honing processing can be performed.

<< Other Embodiments >>
In each of the above embodiments, a moving mechanism for arranging the work W at the grinding processing position and the honing processing position is configured by the work transport unit 30 that conveys the work W to the grinding processing position and the honing processing position while holding the work W. Was there. However, the moving mechanism is not limited to the work conveying section 30, and may be one that moves the grinding section 10 and the honing section 20 instead of moving the work W. Further, the moving mechanism may move all of the grinding unit 10, the honing unit 20, and the work W.

Further, the grinding unit 10 is not limited to the one disclosed in each of the above embodiments, and may have any configuration as long as it grinds the inner peripheral surface C0 of the cylinder portion C while rotating the grinding wheel 11.

Similarly, the honing processing portion 20 is not limited to the one disclosed in each of the above embodiments, and the grindstone holder 22c on which a plurality of honing grindstones 21 are radially mounted is rotated to polish the inner peripheral surface C0 of the cylinder portion C. Any configuration may be used as long as it is used.

Further, in each of the above embodiments, at least one of the grinding part 10 and the honing part 20 is configured to be movable in the X-axis direction, and the center line Z2 of the grindstone holder 22c and the center line of the grinding wheel 11 of the grinding part 10 are formed. It may be configured so that the distance from Z1 can be changed. Then, in the inner peripheral surface machining control, grinding of the inner peripheral surface C0 of the third cylinder portion C3 and honing of the inner peripheral surface C0 of the first cylinder portion C1 are performed in parallel, and the inner peripheral surface of the fourth cylinder portion C4 is inner. Rather than performing the grinding of the peripheral surface C0 and the honing of the inner peripheral surface C0 of the second cylinder portion C2 in parallel, the grinding of the inner peripheral surface C0 of the fourth cylinder portion C4 and the grinding of the inner peripheral surface C1 of the first cylinder portion C1 The honing process of the inner peripheral surface C0 may be performed in parallel. Further, when the work W has five or more cylinder portions C, for example, when the work W has six cylinder portions C arranged in a line at equal intervals, the fourth cylinder portion C4 is used in the inner peripheral surface machining control. Grinding of the inner peripheral surface C0 and honing of the inner peripheral surface C0 of the first cylinder portion C1 are performed in parallel, and grinding of the inner peripheral surface C0 of the fifth cylinder portion C5 and the inner surface of the second cylinder portion C2 are performed. Even if the honing process of the peripheral surface C0 is performed in parallel, the grinding process of the inner peripheral surface C0 of the sixth cylinder portion C6 and the honing process of the inner peripheral surface C0 of the third cylinder portion C3 are performed in parallel. good.

Further, in each of the above embodiments, the work transfer unit 30 is configured to be capable of transporting a tool table in addition to the work table 34, and for example, a plurality of types of honing heads 20a having different grindstone diameters R are prepared in the tool table. By replacing the honing head 20a, it may be configured to be compatible with cylinder bores B having various diameters.

Further, in the first embodiment, the work W can be displaced in the X and Y axis directions during the grinding operation, and in the second embodiment, the grinding wheel 11 can be displaced in the X and Y axis directions during the grinding operation. It is configured in. Therefore, according to each of the above embodiments, the grinding wheel 11 is moved along the inner peripheral surface even if the cross-sectional shape of the plurality of cylinder bores B of the work W is not circular, elliptical or other complicated shape. So-called profile grinding is possible to grind the inner peripheral surface.

As described above, the present invention is useful for an inner peripheral surface processing device and an inner peripheral surface processing method for processing the inner peripheral surface of the cylinder portion surrounding the cylinder bore of the workpiece on which the cylinder bore is formed.

1 Inner peripheral surface processing equipment
10 Grinding part
11 Grinding wheel
20 Honing processing part
21 Honing whetstone
22c whetstone holder
30 Work transfer part (movement mechanism)
40 Control unit
W work (workpiece)
B cylinder bore
C cylinder part
C0 inner peripheral surface
C1 1st cylinder part
C2 2nd cylinder
C3 3rd cylinder
C4 4th cylinder
Z1 Grinding wheel centerline
Center line of Z2 grindstone holder
Center line of the inner peripheral surface of the ZC cylinder

Claims (5)

An inner peripheral surface processing device for processing the inner peripheral surface of a cylinder portion surrounding the cylinder bore of a workpiece on which a cylinder bore is formed.
A grinding unit that has a cylindrical grinding wheel with a diameter smaller than the inner diameter of the cylinder portion, and rotates the grinding wheel around the center line in the cylinder portion to grind the inner peripheral surface of the cylinder portion. When,
It has a plurality of honing grindstones and a cylindrical grindstone holder on which the plurality of honing grindstones are radially mounted, and the grindstone holder is rotated around the center line in the cylinder portion to form an inner peripheral surface of the cylinder portion. A honing part that performs honing processing for polishing, and a honing processing part that performs honing processing
Movement in which the grinding part, the honing part, and the workpiece are relatively moved, and the cylinder part is arranged at the grinding position facing the grinding wheel and the honing position facing the grindstone holder. Mechanism and
After controlling the operation of the grinding part, the honing part, and the moving mechanism, the cylinder part is arranged at the grinding position and the inner peripheral surface is subjected to the grinding, the cylinder part is honed. It is equipped with a control unit that executes inner peripheral surface machining control that is placed at the machining position and performs the above-mentioned honing on the inner peripheral surface.
In the grinding and honing parts, the center line of the grinding wheel and the center line of the grindstone holder are arranged in parallel, and the grinding wheel and the grindstone holder move forward and backward in the respective center line directions. Consists of
The moving mechanism is composed of a work transporting portion that arranges the cylinder portion at the grinding processing position and the honing processing position by moving the workpiece.
The workpiece has a plurality of cylinders arranged in a row at equal intervals.
In the inner peripheral surface machining control, the control unit sends out the workpiece in the arrangement direction of the plurality of cylinders, and arranges the plurality of cylinders in the order of arrangement at the grinding position and the honing position. It is possible to control the operations of the grinding unit, the honing unit, and the work transfer unit so that the grinding process and the honing process are performed in order on the inner peripheral surfaces of the plurality of cylinder units in the order of arrangement. A featured inner peripheral surface processing device. In claim 1,
The workpiece has four cylinders arranged in a row at equal intervals.
The four cylinder parts are composed of a first cylinder part, a second cylinder part, a third cylinder part, and a fourth cylinder part arranged in order.
In the grinding portion and the honing processing portion, when the first cylinder portion is arranged at the honing processing position, the third cylinder portion is arranged at the grinding processing position, and the second cylinder portion is honing processed. The fourth cylinder portion is configured to be arranged at the grinding position when it is arranged at the position.
In the inner peripheral surface machining control, the control unit performs the grinding process on the inner peripheral surface of the third cylinder portion and the honing process on the inner peripheral surface of the first cylinder portion in parallel, and the first 4 Operation of the grinding section, the honing section, and the work transfer section so that the grinding process on the inner peripheral surface of the cylinder portion and the honing process on the inner peripheral surface of the second cylinder portion are performed in parallel. An inner peripheral surface processing device characterized by controlling. In claim 1 or 2,
The above-mentioned workpiece is an inner peripheral surface processing device characterized by being a cylinder block. This is an inner peripheral surface machining method for machining the inner peripheral surface of the cylinder portion surrounding the cylinder bore of a workpiece on which a cylinder bore is formed.
The workpiece has four cylinders arranged in a row at equal intervals.
The four cylinder parts are composed of a first cylinder part, a second cylinder part, a third cylinder part, and a fourth cylinder part arranged in order.
In the order of arrangement of the four cylinders with respect to the inner peripheral surfaces of the four cylinders,
Grinding that grinds the inner peripheral surface of the cylinder with a grinding wheel,
The inner peripheral surface of the cylinder portion ground by the grinding process is polished with a honing grindstone in this order.
The grinding process on the inner peripheral surface of the third cylinder portion and the honing process on the inner peripheral surface of the first cylinder portion are performed in parallel.
An inner peripheral surface processing method characterized in that the grinding process on the inner peripheral surface of the fourth cylinder portion and the honing process on the inner peripheral surface of the second cylinder portion are performed in parallel. In claim 4,
The above-mentioned workpiece is an inner peripheral surface machining method characterized by being a cylinder block.

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