JP2003225846A - One side grinding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a one side grinding device capable of regulating the height of a bottom surface in reference to the curved surface of a work and preventing the unevenness of the bottom surface of the work and performing precision grinding. <P>SOLUTION: The one side grinding device make the roughly conical shaped or roughly semi-spherical shaped work W pass through a gap between the grinding surface 10a of a grinding wheel 10 and a fixed work holding member 20 opposing the grinding surface 10a with a carrier 30 housing the work W in a pocket 31 and rotating, and grinds the bottom surface of the work W. Inner and outer two guide surfaces 21a, 21b extending in an arc shape in the same direction as the passing direction of the work W and guiding two parts of the upper side curved part of the work W is formed on the work holding member 20. Distances between a center line of the work W and contact points of both guide surfaces 21a, 21b and the curved surface of the work W are different to generate a rotation force on the work passing through the gap between the grinding surface 10a and the guide surfaces 21a, 21b by the rotation of the carrier 30. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-side grinding machine for grinding the bottom surface of a work having a substantially conical shape or a substantially hemispherical shape.

In the present specification, the term "substantially conical" includes a conical shape and a truncated cone shape, and the term "substantially hemispherical" includes hemispherical shape, spherical band shape and spherical cap shape. Shall be included. Also, the upper and lower sides refer to the state in which the bottom surface of the work is faced down.

As a work having a substantially hemispherical shape, for example,
Examples include engine shoe ceramic shoes and steel hemispherical tops.

[0004]

2. Description of the Related Art For example, when a bottom surface of a work having a substantially hemispherical shape such as a ceramic shoe of an engine valve or a work having a substantially conical shape is ground, a curved surface (uppermost hemispherical portion or substantially conical shape) of the work is ground. It is required to perform processing so that the height of the bottom surface with respect to the (part) is not varied.

As a grinding device that meets such requirements,
The present inventor has proposed a single-side grinding machine as described in JP-A-2000-246608.

This single-sided grinding machine has a disk-shaped rotary grinding wheel having a flat grinding surface on one end surface, a fixed work holding member facing the grinding surface of the grinding stone, and a plurality of pockets for accommodating works. And a carrier having. The work holding member has the same shape as the grindstone, and guide grooves that extend in an arc shape in the same direction as the movement direction of the work by the carrier are formed on the surface facing the grinding surface of the work holding member. A guide surface that guides the upper curved surface portion of the workpiece at two locations is formed at the edge portion. Then, the work accommodated in the pocket is passed between the grinding surface and the two inner and outer guide surfaces by the rotation of the carrier, and the bottom surface of the work is ground in the meantime.

In this single-sided grinding machine, since two points of the curved surface portion of the work are guided by the two guide surfaces of the work holding member during grinding, the height of the bottom surface with reference to the curved surface portion of the ground work. Is constant and highly accurate grinding is possible.

[0008]

However, in the above-mentioned conventional single-sided grinding machine, the pocket of the carrier has a circular shape having a diameter slightly larger than the outer diameter of the work, and moreover, the inside and outside of the work holding member. Since the two guide surfaces guide the symmetrical portions with respect to the work center line of the curved surface portion of the work, the force for rotating the work does not act on the work being ground. Since the work does not rotate during grinding, a part of the bottom surface of the work may be intensively ground, and the work bottom surface after grinding may be biased. Depending on the product, this biasing may be a problem. There is.

An object of the present invention is to solve the above problems, to make the height of the bottom surface with respect to the curved surface portion of the work constant, and to prevent the occurrence of deviation in the bottom surface of the work.
An object of the present invention is to provide a single-sided grinding machine capable of highly accurate grinding.

[0010]

Means for Solving the Problems and Effects of the Invention A single-sided grinding machine of the present invention is a grinding wheel for rotating a work having a substantially conical shape or a substantially hemispherical shape, which is rotated by a carrier which stores the work in a pocket and rotates the work. A single-sided grinding device for grinding the bottom surface of a work by passing it between a flat grinding surface and a fixed work holding member facing the grinding surface, in the same direction as the work passing direction to the work holding member. In a single-sided grinding machine in which two inner and outer guide surfaces that extend in an arc shape and guide the upper curved surface of the work at two locations are formed, the rotation of the carrier causes the grinding surface of the grinding wheel and the work holding member to be separated from each other. It is characterized in that the distance from the work center line to the point where both guide surfaces contact the curved surface portion of the work is different so that the rotation force acts on the work passing therethrough.

The grinding wheel is a disk-shaped one having a flat grinding surface on one end surface.

In the present specification, the inside and the outside of the two guide surfaces formed on the work holding member are the inside and outside in the radial direction of the arc formed by the guide surfaces.

The inner guide surface is located inside the arc which is the movement locus of the work center, and guides the curved surface portion inside the movement locus of the work center, and the outer guide surface is more than the movement locus of the work center. It is located outside and guides the curved surface portion outside the movement trajectory of the work center.

Since the distances from the work center line to the point where the two guide surfaces contact the curved surface portion of the work are different from each other, there is a difference in the torque applied to the work between the two guide surfaces, which causes the work to rotate. The force acts to rotate the workpiece during grinding.

According to the single-sided grinding machine of the present invention, during grinding,
Since two points on the curved surface of the work are guided by the two guide surfaces of the work pressing member, the height of the bottom surface with respect to the curved surface of the ground work becomes constant, and highly accurate grinding can be performed. Further, during grinding, the work is rotated as described above, so that the bottom surface of the work is evenly ground. Therefore, the bottom surface of the work after grinding is not biased, and highly accurate grinding can be performed.

For example, the outer guide surface has a larger distance from the work center line to the point where the guide surface contacts the curved surface portion of the work.

In the single-sided grinding machine of the present invention, for example, the two guide surfaces are tapered surfaces whose intervals increase toward the lower side, and the two guide surfaces have different taper angles.

With this configuration, the two guide surfaces can be point-contacted with the curved surface of the substantially hemispherical workpiece to guide the workpiece.

In the above case, the taper angles of the two guide surfaces are different from each other, so that when the work is guided by the two guide surfaces, the distance from the center line of the work is two.
The two guide surfaces have different distances to the point of contact with the curved surface of the workpiece.The guide surface with the larger taper angle guides the portion closer to the work center line of the curved surface, and the guide surface with the smaller taper angle is the curved surface. Since a part of the work that is distant from the center line of the work is guided, a difference occurs in the torque applied to the work by the two guide surfaces, and this becomes the force for rotating the work.

In the above case, for example, the guide surface on the inside has a larger taper angle.

In the single-side grinding machine of the present invention, for example, the two guide surfaces are tapered surfaces with a distance increasing toward the lower side, and the angle of the taper of both guide surfaces is a substantially conical curved surface part. And the height from the grinding surface of the grinding wheel to both guide surfaces is different from each other.

With this configuration, since the taper angle of the two guide surfaces is equal to the cone angle of the curved surface portion of the substantially conical work, the two guide surfaces contact the curved surface portion of the substantially conical work. You can guide the work.

In the above case, since the heights of the two guide surfaces are different from each other, when the work is guided by the two guide surfaces, the distances from the work center line to the two guide surfaces are mutually different. Differently, the higher guide surface guides the part close to the work center line of the curved surface part, and the lower guide surface guides the part far from the work center line of the curved surface part.
There is a difference in the torque applied to the work by the two guide surfaces,
This is the force to rotate the work.

In the above case, for example, the height from the grinding surface of the grinding wheel to the guide surface is higher on the inner guide surface.

In the above case, the tapered surface forming the guide surface includes both a narrow tapered surface having a straight cross section and a wide tapered surface having a curved cross section.

Further, the two guide surfaces may be curved surfaces whose cross sections are arcs having a relatively small curvature.

For example, the work holding member has a plate shape,
A groove extending in an arc shape in the same direction as the passage direction of the work is formed on the surface of the work holding member facing the grinding surface of the grinding wheel.
Guide surfaces are formed at the inner and outer edges of the groove. The work holding member may be a disk-shaped member having the same shape as the grinding wheel.

With this arrangement, the two guide surfaces as described above can be easily formed on the plate-like work holding member, and the two guide surfaces guide only the two curved portions of the work. Thus, the other part of the work can be prevented from interfering with the work holding member.

In the single-sided grinding machine of the present invention, for example, the carrier has a gear shape, and a plurality of pockets are formed on the outer peripheral portion of the carrier, the outer side in the radial direction of the carrier being open, and the intervals being wider toward the outer side in the same direction. There is.

In this way, two contact surfaces are formed at two front and rear positions of each pocket of the carrier in the carrier rotation direction, with the front-to-back spacing increasing toward the outside.
The contact surfaces may be flat or curved.

From the time the work is accommodated in the pocket of the carrier to the time between when the work is placed between the grinding surface of the grinding wheel and the guide surface of the work pressing member, usually two positions in the circumferential direction of the work are the pocket. The front and rear contact surfaces are brought into contact with each other, whereby the workpiece is positioned in the carrier radial direction, and the workpiece is reliably fed between the grinding surface and the guide surface. After the work has entered between the grinding surface and the guide surface, at least the contact surface on the rear side of the pocket is 1 in the circumferential direction of the work.
The workpiece is brought into contact with the location and pushed in the carrier rotation direction to move along the grinding surface and the guide surface. At this time, the abutting surface on the rear side of the pocket that widens toward the rear side in the radial direction of the carrier pushes the work in the carrier rotation direction, so that the work is pushed outward and guided outside the work holding member. The work is pressed against the surface, and the gear effect is exerted by the frictional force between the work and the rear contact surface and guide surface of the pocket, so that the work rotates in the direction opposite to the carrier rotation direction.

In this case, in the state where the work enters the pocket and is in contact with the front and rear contact surfaces, a part of the work is projected outside the outer circumference of the carrier in the radial direction of the carrier. Since there is no carrier in the carrier that restricts the movement of the work in the radial direction of the carrier, the portion between the loading position of the work on the carrier and the start end of the guide surface of the holding member, and the guide surface of the holding member. A guide member that restricts the movement of the work in the radial direction of the carrier is provided in a portion between the end of the work and the position where the work is unloaded from the carrier.

By making the carrier into a gear shape, the outer side in the radial direction of the carrier is opened at the outer peripheral portion of the carrier, and as described above, the front-back distance between the two front and rear abutting surfaces increases as it goes outward in the radial direction of the carrier. It is possible to form a plurality of pockets, and the contact surface on the rear side of each pocket can apply a force for rotating the workpiece to the workpiece during grinding. Therefore, it is possible to pass a plurality of works between the grinding wheel and the work holding member while continuously rotating the works. Further, since the outer side of the pocket in the radial direction of the carrier is opened, the work is supplied to the carrier only by moving the work in the radial direction of the carrier.
Ejection is possible, and there is no need to move the work up and down to supply and eject the work.

However, the pockets of the carrier may be closed holes.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show the first embodiment. In the following description, the left side of FIG. 1 is called the left, the right side is called the right, the bottom of FIG. 2 is called the front, and the top is called the rear. Further, the rotation direction means the direction viewed from above.

FIG. 1 is a vertical sectional view of a main part of a single-side grinding machine.

As shown in FIG. 1, the single-sided grinding machine is the same as the grinding wheel (10) in the form of a horizontal disk, and the grinding wheel (10) arranged above and above the grinding wheel (10) with a space above and below it. Shaped work holding member (20), a horizontal disk-shaped carrier (30) arranged so that the left side portion is located between the grindstone (10) and the holding member (20), and slightly below the carrier (30). Surface plates arranged horizontally (40)
Is equipped with.

FIG. 2 is a sectional view taken along line II-II of FIG.
That is, it is a plan view of the grindstone (10), the carrier (30), and the surface plate (40). FIG. 3 is a sectional view taken along the line III-III in FIG. 1, that is, a bottom view of a portion of the pressing member (20). FIG. 4 is an enlarged view of a part of FIG. 1, and FIG.
2 is an enlarged view of a part of FIG.

The first embodiment is intended for a hemispherical work (W) as shown in FIG. This work (W)
Is a hemispherical curved surface portion (1b) formed on the upper side of a flat bottom surface (1a).

The grindstone (10) is fixed upward to the upper end of a vertically extending rotary shaft (11), and its upper end surface is a flat grinding surface (10).
a). The rotary shaft (11) is rotated by an appropriate rotary drive device (not shown), and thereby the grindstone (10) is rotated. The grindstone (10) may be, for example, an SD (synthetic diamond) grindstone, a CBN (cubic boron nitride) grindstone, or the like.

The holding member (20) is fixed to the lower end of a vertically extending support shaft (22), and the lower end surface of the holding member (20) is a grindstone (10).
It faces the ground surface (10a). Support shaft for the holding member (20)
A guide groove (23) extending in the circumferential direction of the carrier (30), that is, in an arc direction around the rotation center (30c) of the carrier (30), is formed in a portion on the right side of the (22). The cross section of the groove (23) has an inverted V shape, and two inner and outer tapered guide surfaces (21a) (21b) extending in the arc direction are formed along both sides of the groove (23). The two guide surfaces (21a) and (21b) are tapered surfaces with a distance increasing toward the lower side. That is, the inner guide surface (21a) is a convex taper surface centered on the carrier rotation center (30c) and becoming thinner toward the lower side, and the outer guide surface (21b) is the carrier rotation center (30c). Centered on
It is a concave tapered surface that widens toward the lower side. The taper angle α1 of the inner guide surface (21a) (the angle formed by the taper surface and the center line of the taper surface) is larger than the taper angle α2 of the outer guide surface (21b). Also, the lower part of the holding member (20) on the right side of the inner guide surface (21a) is removed to a predetermined height, and the thickness of this part (thin portion) (20a) from the upper end surface is It is thinner than that of the part. Support shaft (22)
Is moved up and down by an appropriate driving device (not shown), and the vertical distance between the grindstone (10) and the pressing member (20) can be adjusted according to the size of the workpiece (W) to be ground. The rear end of the groove (23) is the start end and the front end is the end end.

The carrier (30) extends vertically and the surface plate (4
It is fixed to the upper end of the rotary shaft (32) protruding upward from the upper surface of (0). The rotary shaft (32) is rotated by a suitable rotary drive, which causes the carrier (30) to rotate counterclockwise, as indicated by arrow B in FIG. The left outer peripheral portion of the carrier (30) is the thin portion (20
It is located between the portion on the right side of the outer guide surface (21b) including a) and the grinding surface (10a) of the grindstone (10). The lower surface of the thin portion (20a) of the holding member (20) and the grinding surface (10a) of the whetstone (10) are adjusted in such a manner that the vertical distance between the holding member (20) and the whetstone (10) is minimized. The vertical distance between and is larger than the thickness of the carrier (30), and there is a space between the carrier (30) and the pressing member (20) and between the carrier (30) and the grindstone (10).

The carrier (30) has a gear shape, and a plurality of pockets (31) are formed on the outer periphery of the carrier (30) and are radially outwardly opened.
Are formed at equal intervals in the circumferential direction. As shown in detail in FIG. 5, two front and rear positions of each pocket (31) in the carrier rotation direction B are respectively brought into contact with one position in the circumferential direction of the work (W), and a flat contact surface (31a). (31b) is formed. The front-rear distance between the two contact surfaces (31a) and (31b) becomes larger toward the outer side in the radial direction of the carrier. The front-rear distance between the two contact surfaces (31a) (31b) is smaller than the outer diameter of the work (W) at the innermost side in the radial direction, and larger than the outer diameter of the work (W) at the outermost side in the radial direction.

The surface plate (40) has a shape in which a part of the left side of the disk is cut out, and is fixedly arranged below the carrier (30) so as to be concentric with the carrier (30). . The outer diameter of the surface plate (40) is larger than the outer diameter of the carrier (30), and the upper surface of the surface plate (40) is flush with the grinding surface (10a) of the grindstone (10). Plate (4
Part of the left side of (0), to avoid interference with the grindstone (10),
It is notched, and the peripheral surface of the notched portion (40a) is close to the outer peripheral surface of the grindstone (10). An arcuate loading-side guide member (41) concentric with the carrier (30) is provided on the rear outer periphery of the upper surface of the surface plate (40). The guide member (41) extends from the end position near the left side of the start end of the groove (23) of the pressing member (20) to the start end position on the rear side in the carrier rotation direction B, and the start end of the guide member (41). The portion on the rear side of the carrier rotation direction B is the work loading position (42). An arc-shaped discharge-side guide member (43) concentric with the carrier (30) is provided on the outer periphery of the upper surface of the surface plate (40) on the front side. This guide member (43)
Extends from the starting end position near the left side of the end of the groove (21) of the pressing member (20) to the end position on the front side in the carrier rotation direction B, and the position on the front side in the carrier rotation direction B from the end of the guide member (43). The part is the work discharge position (44).

In the above single-sided grinder, the work (W) is ground as follows.

When the work (W) is ground, the grindstone (10) is rotated clockwise and the carrier (30) is rotated counterclockwise as described above. Then, in such a state, at the work carry-in position (42), the work (W) is moved by the work carry-in device (not shown) as shown by an arrow X in FIG.
The upper part of the carrier (3
It is supplied to the pocket (31) of 0). The work (W) accommodated in the pocket (31) is moved along the carry-in side guide member (41) by the rotation of the carrier (30), and is rotating.
Grinding surface (10a) of (10) and guide surface (21a) (21b) of pressing member (20)
The bottom surface (1a) of the work (W) is ground and moved along the discharge side guide member (43) at the work discharge position (44). As shown by an arrow Y in FIG. 2, the apparatus moves the surface of the surface plate (40) to the outer side in the radial direction of the carrier and discharges the carrier.

More specifically, the work carry-in position
The work (W) supplied to the pocket (31) of the carrier (30) at (42) has contact surfaces (31a) and (31b) before and after the pocket (31).
Abutting at two locations, thereby positioning the work (W) in the carrier radial direction. At this time, the pocket (31)
Part of the work (W) positioned inside is the carrier (30)
Of the workpiece (W) from the outer periphery of the carrier in the radial direction of the carrier, and the top and bottom of the work (W) are above and below the carrier (30). This work (W) enters the carrier radial direction inner side from the start end of the carry-in side guide member (41) and comes into contact with the two contact surfaces (3) of the pocket (31).
1a) and (31b) and the guide member (41) hold the pocket (31) at a substantially constant position, and along the guide member (41) the surface plate (4
0) Move up.

The work (W) is further provided with a groove for the pressing member (20).
From the starting end of (23) enters between the grindstone (10) and the pressing member (20),
It moves along the grinding surface (10a) and the guide surfaces (21a) and (21b), and the bottom surface (1a) of the work (W) is ground by the grinding surface (10a) during that time.

At this time, the inner guide surface (21a) comes into point contact with the curved surface portion (1b) of the work (W) on the inner side in the carrier radial direction with respect to the arc which is the movement locus (Tc) of the work center line (Wc). The outer guide surface (21b) makes point contact with the curved surface portion (1b) of the work (W) on the outer side in the carrier radial direction with respect to the movement trajectory (Tc) and guides this portion. In this way, the curved surface part (1) of the work (W) on the opposite side to the work center line (Wc)
By guiding the two guide surfaces (21a) and (21b) at two locations in (b), the height of the bottom surface (1a) with respect to the curved surface portion (1b) of the ground work (W) is constant. become.

Also, the two contact surfaces (31a) of the pocket (31)
Of the (31b), at least the rear contact surface (31b) is the work piece.
The workpiece (W) is pressed in the carrier rotating direction B by contacting with one point in the circumferential direction of (W), and the grinding surface (10a) and the guide surfaces (21a) (21b)
Move along. At this time, the rear contact surface (31b), which spreads rearward as it goes outward in the radial direction of the carrier, pushes the work (W) in the carrier rotation direction B,
(W) is pushed outward and pressed against the outer guide surface (21b), and the gear effect due to the frictional force between the work (W) and the contact surface (31b) and the guide surface (21b) acts. , The work (W) rotates in a direction opposite to the carrier rotation direction B. Further, since the taper angles α1 and α2 of the two guide surfaces (21a) and (21b) are different from each other, when the work (W) is guided by the two guide surfaces (21a) and (21b), the work center Two guideways from line (Wc)
The distances (21a) and (21b) to the point where the curved surface portion (1b) of the work (W) contacts are different from each other. That is, as shown in detail in FIG. 4, the distance R1 from the work center line (Wc) to the point where the inner guide surface (21a) with a large taper angle α1 contacts the curved surface portion (1b) of the work (W) is , Outer guide surface with small taper angle α2
Less than the above distance R2 for (21b), the inner guide surface (2
1a) guides the part near the work center line (Wc) of the curved surface part (1b), and the outer guide surface (21b) guides the work center line of the curved surface part (1b).
Guide the part far from (Wc). For this reason, two guide surfaces
(21a) and (21b) cause a difference in the torque applied to the work (W), and this becomes the force for rotating the work (W). In this case, the distance R2 of the outer guide surface (21b) is closer to the inner guide surface (21a).
Since the distance R1 is larger than the distance R1, the torque, that is, the frictional force on the outer guide surface (21b) is larger, and the work (W) is rotated as described above. Then, the bottom surface (1a) of the work (W) is evenly ground by rotating the work (W) being ground in this way.

The work (W) which has been ground is again moved onto the surface plate (40) from between the grindstone (10) and the pressing member (20), and along the discharge side guide member (43). After moving on the surface plate (40), it is discharged from the pocket (31) at the discharge position (44).

FIG. 6 shows the second embodiment. This FIG. 6 corresponds to FIG. 4 of the first embodiment.

The second embodiment is intended for a work (W) having a truncated cone shape as shown in FIG. This work (W)
In the above, a short cylindrical portion is formed on the upper side of the flat bottom surface (2a), and a frustoconical curved surface portion (2b) is further formed on the upper side thereof.

The single-side grinding machine of the second embodiment differs from that of the first embodiment in that the guide groove (24) formed in the work holding member (20) and the two inner and outer guide surfaces (25a, 25b) are configured. Different,
Other configurations are the same as those of the first embodiment.

As shown in FIG. 6, the groove (24) formed in the pressing member (20) is a square groove having a rectangular cross section, and the groove (24) is formed inside and outside along the opening edge portions on both sides of the groove (24). Two tapered guide surfaces (25
a) (25b) is formed. The taper angles β of the two guide surfaces (25a) and (25b) are equal to each other and the taper angle (cone angle) β of the curved surface portion (2b) of the work (W). Further, since the portion of the pressing member (20) on the right side of the groove (24) is the thin portion (20a) as in the case of the first embodiment, the grinding surface (10a) of the grindstone (10) is Two guideways (25a) (25
The heights up to b) are different from each other, and the inner guide surface (25a) is higher than the outer guide surface (25b).

Also in this case, the work (W) is the carrier (30).
By, it is sent between the grindstone (10) and the pressing member (20), moves along the grinding surface (10a) and the guide surface (21a) (21b),
Meanwhile, the bottom surface (2a) of the work (W) is ground by the grinding surface (10a).

At this time, the inner guide surface (25a) comes into line contact with the curved surface portion (1b) of the work (W) on the inner side in the carrier radial direction from the movement trajectory (Tc) of the work center line (Wc), and this portion. The outer guide surface (21b) linearly contacts the curved surface portion (1b) of the work (W) on the outer side in the carrier radial direction with respect to the movement trajectory (Tc) and guides this portion. Since the taper angle β of the two guide surfaces (25a) and (25b) is equal to the angle of the cone of the curved surface portion (2b) of the work (W), these guide surfaces (25a) and (25b) are aligned with the work center line (Wc ) Curved surface part (1b) of the workpiece (W) on the opposite side
It is possible to guide the work (W) by making line contact with two points of the bottom surface of the work (W), and thereby the bottom surface of the ground work (W) with the curved surface portion (1b) as a reference, as in the case of the first embodiment. The height of (1a) becomes constant.

The two guide surfaces (25a) and (25b) are ground (1
When the work (W) is guided by the two guide surfaces (25a) (25b) because the height from the work (W) is different from the bottom (2a) of the work (W). , Work center line
The distance from (Wc) to the point where the two guide surfaces (25a) and (25b) contact the curved surface portion (2b) of the work (W) are different from each other. That is, as shown in detail in FIG. 6, the inner guide surface (25a) at a position higher than the work center line (Wc) is the curved surface portion (2) of the work (W).
The distance R1 to the point in contact with b) is smaller than the above distance R2 for the lower outer guide surface (25b), and the inner guide surface (25a) has the work center line (Wc) of the curved surface portion (2b). The outer guide surface (25b) guides a portion of the curved surface portion (25b) far from the work center line (Wc). Therefore, the first
As in the case of the embodiment, a difference occurs in the torque applied to the work (W) by the two guide surfaces (25a) and (25b), which is the work (W).
Will be the power to rotate.

Other operations and effects are the same as in the case of the first embodiment.

The configuration of each part of the single-sided grinding machine is not limited to that of the above-mentioned embodiment, but can be changed appropriately.

In the above embodiment, the guide surfaces (21a) (21b) (25
Although a) and (25b) are tapered surfaces, the shape of the guide surface is not limited to this, and may be, for example, a curved surface whose cross section is an arc having a relatively small curvature. By doing so, regardless of whether the work is of a substantially hemispherical shape or a substantially conical shape, the two guide surfaces can be in contact with the curved surface portion of the work to guide the work. By making the heights to both guide surfaces different from each other, the distance from the work center line to the point where both guide surfaces contact the curved surface portion of the work can be made different from each other.

In the above embodiment, the contact surfaces (31a) (31b) of the pockets (31) of the carrier (30) are flat surfaces, but the contact surfaces of the pockets of the carrier are, for example, in the circumferential direction of the workpiece. 1
It may be a curved surface that comes into contact with the place, preferably a convex curved surface.

In the above embodiment, the outer side of the pocket (31) of the carrier (30) in the radial direction of the carrier is open, but the pocket may be a hole-like shape whose outer side in the radial direction of the carrier is closed.

In the above embodiment, the carrier (30) has a disk shape and the plurality of pockets (31) are formed on the outer peripheral portion thereof. However, the carrier has, for example, a plurality of pockets formed on the outer peripheral portion. Alternatively, it may have a polygonal shape, or may have one or two or more arms having pockets formed at the tips thereof.

Further, the above-mentioned one-side grinding machine is intended for a hemispherical work (W) and a truncated cone work (W), but the present invention is not limited to this, and is a substantially truncated cone work. Alternatively, it can be applied to a single-sided grinding machine for a substantially hemispherical work.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part of a single-side grinding machine showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged view of a part of FIG. 1.

FIG. 5 is an enlarged view of a part of FIG.

FIG. 6 is a drawing corresponding to FIG. 4, showing a second embodiment of the present invention.

[Explanation of symbols] (1a) Bottom of work (1b) Workpiece curved surface (10) Grinding wheel (10a) Ground surface (20) Work holding member (21a) (25a) Inner guide surface (21b) (25b) Outer guide surface (23) (24) Guide groove (30) Career (31) Pocket (31a) Front contact surface of pocket (31b) Rear contact surface of pocket (W) Work (Wc) Work center line (Tc) Movement locus of work center (N1) (N2) Carrier radius line

Claims (4)

[Claims] 1. A work having a substantially conical shape or a substantially hemispherical shape,
By the carrier that stores the work in the pocket and rotates,
A single-sided grinding device that grinds the bottom surface of a work by passing it between a flat grinding surface of a rotating grinding wheel and a fixed work holding member facing the grinding surface. In a single-side grinding machine in which two inner and outer guide surfaces are formed that extend in an arc shape in the same direction as the passage direction and guide the upper curved surface of the work at two locations, the grinding surface of the grinding wheel and the work holding member are rotated by the rotation of the carrier. One-side grinding machine characterized in that the distance from the work center line to the point where both guide surfaces contact the curved surface part of the work is different so that the rotation force acts on the work passing between . 2. The single-side grinding machine according to claim 1, wherein the two guide surfaces are tapered surfaces whose intervals are widened toward the lower side, and the taper angles of the two guide surfaces are different from each other. 3. The two guide surfaces are tapered surfaces with a distance increasing toward the lower side, and the angle of taper of both guide surfaces is equal to the angle of the cone in the curved surface portion of the substantially conical work, 2. The single-sided grinding machine according to claim 1, wherein the heights from the grinding surface of the grindstone to both guide surfaces are different from each other. 4. The carrier has a gear-like shape, the outer periphery of which is
The single-side grinding machine according to any one of claims 1 to 3, wherein a plurality of pockets are formed which are open on the outside in the radial direction of the carrier and whose intervals are widened toward the outside in the same direction.