JP2001121395A - Spherical surface and nonspherical surface polishing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finish-polish into a mirror finished surface without breaking surface shape previously formed with high accuracy by grinding or cutting. SOLUTION: This spherical surface and nonspherical surface polishing device comprises a linear polishing material 1 provided with an abrasive; a feeding part 2 provided with a delivery reel 3 for feeding the linear polishing material 1; a winding part 7 provided with a winding reel 8 for winding the linear polishing material 1 delivered from the feeding part 2, at a specified space from the feeding part 2; and a pressure contact means 12 for forcibly bring the linear polishing material 1 traveling between the feeding part 2 and the winding part 7, into pressure contact with a polished surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a spherical or aspherical surface, such as a spherical or aspherical lens, or a molding surface of a lens molding die for molding such a lens with high precision. The present invention relates to a method and an apparatus for polishing a mirror surface without breaking.

[0002]

2. Description of the Related Art The shape of a lens used in an optical device such as a camera is formed by a combination of a flat surface, a concave surface and a convex surface. In the mold for molding a plastic lens having such a spherical shape, after a machined surface of a spherical shape is formed by lathe processing, a polishing plate A on which an abrasive or the like is adhered is used in a method shown in FIG. B
Grinding the processing surface D by rotating the mold C constantly while swinging to the right or left or rotating with a certain radius,
In the same manner as in the case of polishing a spherical glass lens, the processed surface D was finished in a shape and a mirror surface which were sufficiently required as a molded finished surface of the lens.

On the other hand, the aspherical surface to which the present invention is applied is not a spherical body having concave and convex shapes as described above, but a parabolic surface,
It is a paraboloid or a hyperboloid consisting of a hyperboloid, an ellipsoid, or other revolving quadratic surface, or a shape similar to this. Such an aspheric surface rotates a cutting tool or a workpiece (die) about one point. It is not possible to process with the method that does.

A typical precision of a lens molding surface of a plastic lens molding die requires a shape precision of 1 μ (micron) or less and a surface roughness of about 0.05 to 0.1 s. In order to obtain such conditions, conventionally, a mold for molding an aspherical plastic lens, that is, an aspherical mold having an aspherical surface on the lens molding surface has been manufactured by the following processing method. Was adopted.

[0005] First, after a cutting surface of an aspherical body is cut out from a die material by an NC lathe, the aspherical surface of the cutting surface is further subjected to an NC grinding machine, and the die is subjected to such cutting and grinding. The accuracy of the aspherical machined surface of the
Within 1 μm, the surface roughness is maintained at 1-2 s. The above processing is cutting and grinding by numerical control, so to speak, a process to create an aspherical body, and in order to finish the mold to a mirror surface, the aspherical surface must be polished afterwards. No. The problem is how to polish the surface roughness 1-2 s obtained by the grinding process to 0.05-0.1 s, which is necessary for the lens forming surface, without losing the shape accuracy in the subsequent polishing process. There is crab.

A polishing method for an aspherical body conventionally used is introduced as follows. (1) Hand polishing method As shown in FIG. 9, this is a method in which the grinding stone E is moved in small steps in the direction of the arrow while carefully taking care not to disturb the shape of the aspherical body, and uniformly polished manually. This method is easy to handle, and has already been put to practical use in molding dies such as magnifying glasses, but it is necessary to use a molding die for a lens requiring a high-precision shape such as a camera lens. A mold that is not sufficiently satisfactory in terms of the uniformity of the surface shape cannot be obtained. Since this defect is a method of partially polishing by the hand polishing method, the mark polished by the grindstone E becomes a surface state like an aggregate of small surfaces as schematically indicated by F. This is because the entire surface is a polyhedron, and the polyhedron is more non-uniform.

(2) Polishing method using a polishing dish provided with an elastic body As shown in FIG. 10, an elastic body G is used for a part of a polishing dish A, and a kansashi B is used in the same manner as the polishing method for a spherical body shown in FIG. Polish the machine using. This polishing is based on the principle that the polishing plate A can always be in contact with the processing surface D by the elastic body G expanding and contracting. However, the polishing pressure fluctuates because the expansion and contraction of the elastic body is not constant, and undulation is likely to occur on the processed surface. Further, for an aspherical surface H having a shape as shown in FIG. 11, that is, an aspherical surface having a larger degree of asphericity J than a spherical surface I having a radius R, there is a limit in the expansion and contraction of the elastic material. Top polishing is not possible.

(3) Polishing Method Using Balloon Polisher As shown in FIG. 12, a polishing sheet K formed by applying abrasive grains to a nylon sheet is expanded and contracted while a die surrounded by a peripheral sag preventing ring L is provided. It comes into contact with the processing surface D of the aspherical body C, and performs the same movement as the polishing dish of FIG. The pressure during polishing can be freely adjusted by the air pressure flowing from the through hole M. This method has better uniformity of the processed surface than the method shown in FIG. However, with respect to an aspherical surface having a large degree of aspherical surface as shown in FIG. 11, even in this method, the expansion and contraction of the polishing sheet cannot follow the aspherical surface, and uniform polishing cannot be expected.

[0009]

In order to mold an aspherical plastic lens, a highly accurate aspherical mold is required. However, in aspherical mold processing, even though the aspherical surface to be the finished surface of the lens can be cut to a certain degree of precision by cutting and grinding, the largest bottleneck in machining work is cut out. The final polishing process is performed on the processed aspheric surface.

According to the conventional polishing method, as described above,
In each case, the processing is performed by surface contact, and there has been a problem that the high-precision shape of the processed surface obtained in the previous process by cutting or grinding is broken, or the aspherical shape that can be processed is limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a spherical or aspherical lens whose shape is formed with high precision by NC grinding or NC cutting, or a lens molding metal for molding these lenses. An object of the present invention is to provide a method and an apparatus for polishing spherical and aspherical surfaces capable of polishing and polishing a surface having a large roughness to a mirror surface having a small surface roughness without breaking a surface shape such as a molding surface of a mold.

[0012]

According to a first aspect of the present invention, there is provided a method for polishing a spherical surface or an aspherical surface, comprising the steps of: feeding a linear abrasive containing an abrasive into a feeding portion and a winding portion; While traveling between the linear abrasives during the traveling process, the linear abrasive and the surface to be polished are relatively moved to each other while the linear abrasive is forcibly pressed against the surface to be polished. The surface to be polished is polished.

In a second aspect of the present invention, there is provided a method for polishing a spherical surface or an aspherical surface according to the first aspect, wherein the linear abrasive containing the abrasive is a metal wire, a glass wire, a synthetic fiber or It is characterized by being formed by kneading or impregnating an abrasive such as diamond, chromium oxide or calcined alumina into a linear member such as a natural fiber.

Further, in the polishing method for spherical and aspherical surfaces according to a third aspect of the present invention, in the first aspect, the means for forcibly pressing the linear abrasive onto the surface to be polished includes the linear abrasive. It is characterized in that it comes into pressure contact with a pressure contact member that moves up and down or swings in a direction perpendicular to the running direction of the abrasive.

In a fourth aspect of the present invention, there is provided a method for polishing a spherical surface or an aspherical surface according to the first aspect, wherein the linear abrasive is wound with the feeding section fixed at a predetermined interval. The surface to be polished of the object to be polished while traveling between the taking sections is
The linear abrasive is supported while being erected in a direction orthogonal to the running direction of the linear abrasive, and is supported while being rotated and oscillated.

In a fifth aspect of the present invention, there is provided a method for polishing a spherical surface or an aspherical surface according to the first aspect, wherein the linear abrasive is wound around the feeding portion fixed at a predetermined interval. The surface to be polished of the object to be polished while traveling between the taking sections is
Support in a direction parallel to the running plane of the linear abrasive,
And it is characterized in that it is supported while rotating and swinging.

In a sixth aspect of the present invention, the method for polishing a spherical surface or an aspherical surface according to the first aspect is characterized in that the feeding portion and the winding portion of the linear abrasive are moved in a vertical direction, and It is characterized in that a pressing member for rotating the surface to be polished and forcibly pressing the linear abrasive to the surface to be polished is swung along the surface to be polished.

According to a seventh aspect of the present invention, there is provided a spherical or aspherical polishing apparatus comprising: a linear abrasive having an abrasive; a feeding section having a delivery reel for feeding the linear abrasive; A winding unit provided with a take-up reel that winds the linear abrasive sent out from the feeding unit at a predetermined interval from the feeding unit; and the linear abrasive running between the feeding unit and the winding unit. And a pressure-contacting device for forcibly pressing against the surface to be polished.

The spherical and aspherical polishing apparatus according to an eighth aspect of the present invention is the polishing apparatus according to the seventh aspect, wherein the pressing member has a groove having a width smaller than a diameter of the linear abrasive at an outer peripheral surface. The roller is provided so as to be rotatable.

In a ninth aspect of the present invention, there is provided the polishing apparatus for spherical and aspherical surfaces according to the eighth aspect, wherein the roller rotatably attached to the tip of the pressing member is formed of an elastic material such as polyurethane. It is characterized by the following.

That is, in the method for polishing a spherical surface or an aspherical surface according to the first aspect of the invention, the running linear abrasive is forcibly pressed against the surface to be polished. Here, the surface to be polished is processed to a desired high-precision shape accuracy by a cutting or grinding process in a previous process. The linear abrasive is pressed against the surface to be polished in a state close to point contact, and the point contact portion and the surface to be polished are relatively moved to process the entire surface to be polished with high precision. Polishing without impairing certain shape accuracy.
During polishing, the running linear abrasive continuously supplies new abrasive to the polishing position, stabilizes the polishing ability during polishing, and does not cause processing errors due to aging.

In the method for polishing a spherical surface or an aspherical surface according to the second aspect of the present invention, the linear abrasive is formed by kneading or impregnating an abrasive, and polishing of the abrasive from outside during polishing is performed. Eliminates supply.

Further, in the method for polishing a spherical surface and an aspherical surface according to the third aspect of the present invention, the means for forcibly pressing the linear abrasive on the surface to be polished is a pressing member for vertically moving or swinging,
The pressing tool is moved up and down or swinging along the surface to be polished, and the entire surface of the surface to be polished is polished by the linear abrasive material pressed against the surface to be polished in the above-mentioned point contact state.

In the method for polishing a spherical surface or an aspherical surface according to the fourth aspect of the present invention, the surface to be polished is supported in a direction orthogonal to the running direction of the linear abrasive, and the surface to be polished is The entire surface of the surface to be polished is polished with a linear abrasive material that is pressed against the surface to be polished in a point contact state while rotating and swinging.

In the method for polishing a spherical surface or an aspherical surface according to the fifth aspect of the present invention, the surface to be polished is supported in a direction parallel to a running plane of the linear abrasive, and The entire surface of the surface to be polished is polished with a linear abrasive material which is pressed against the surface to be polished in a point contact state while rotating and swinging the surface.

Further, in the method for polishing a spherical surface and an aspherical surface according to the sixth aspect of the present invention, the pressing tool is moved along the surface to be polished while pressing the linear abrasive against the rotating surface to be polished. To polish the entire surface to be polished. At this time, the feed portion and the winding portion are moved up and down in accordance with the position where the surface to be polished is polished, i.e., in response to the swinging motion of the pressing device, so that the pressing position of the linear abrasive in the pressing device is fixed. To maintain.

In the spherical and aspherical polishing apparatus according to the seventh aspect of the present invention, the linear abrasive is fed from the feeding section and wound up by the winding section, and the linear abrasive is wound between the feeding section and the winding section. To travel the linear abrasive. The running linear abrasive material is forcibly pressed into contact with the surface to be polished in a state close to point contact by a pressure welding tool, and the surface to be polished is polished.

Also, in the spherical and aspherical polishing apparatus according to the eighth aspect of the present invention, a roller having a groove having a width smaller than the diameter of the linear abrasive is rotatably mounted on the pressing member, and the roller is rotatably mounted on the roller. The linear abrasive is engaged and the linear abrasive on the side to be polished is projected from the roller. The protruding linear abrasive material is brought into pressure contact with the surface to be polished in a point contact state without dropping from the pressure welding device, and polishes the surface to be polished.

Furthermore, in the spherical and aspherical polishing apparatus according to the ninth aspect, the roller of the pressing member is formed of an elastic material such as polyurethane, and the linear abrasive is adapted to the surface to be polished. Improve the performance.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a polishing method for a spherical surface and an aspherical surface according to the method of the present invention will be described in detail together with a polishing apparatus directly used for carrying out the method.

(Embodiment 1) FIGS. 1 (a) and 1 (b)
FIG. 2 is a side view and a plan view of a polishing apparatus 20 used in Embodiment 1 of the present invention.

The polishing apparatus 20 includes a linear abrasive 1, a feeding unit 2 for feeding the linear abrasive 1, and a winding unit for winding the linear abrasive 1 sent from the feeding unit 2. 7 and a pressure welding tool 12 for pressing the linear abrasive 1 against the surface to be polished.

The linear abrasive material 1 has a shape corresponding to the surface to be polished of the object to be polished, and a linear member made of a metal wire, a glass wire, or a natural or synthetic fiber having a required tensile strength. It is formed by kneading or impregnating an abrasive such as chromium oxide or calcined alumina.

The feed unit 2 has a feed reel 3 for feeding the linear abrasive 1, and the feed reel 3 is attached to and detached from a rotary drive shaft 4 of a motor 6 mounted on a base 5 of the feed unit 2. It is freely attached.

The take-up section 7 is provided with a take-up reel 8 for the linear abrasive material 1. The take-up reel 8 is detachably attached to a rotary drive shaft 11 of a motor 10 mounted on a base 9. It is.

The pressing member 12 is disposed between the feeding section 2 and the winding section 7.
In addition to supporting the linear abrasive 1 traveling between the upper and lower portions in a direction perpendicular to the traveling direction of the linear abrasive 1,
7 are spaced apart from each other. That is, the linear abrasive 1 is fed from the feeding section 2 to the winding section 7 and is wound up by the winding section 7, so that the linear abrasive 1 travels between the two 2 and 7. When the linear abrasive 1 is forcibly pressed against the surface to be polished of the object to be polished via the pressure-welding tool 12 during the traveling process, the work such as polishing between the traveling process and the polishing is performed. The feeding unit 2 and the winding unit 7 are arranged at an interval necessary for an operation of supporting an object and moving the surface to be polished in a direction relative to the linear abrasive 1.

Further, the feeding of the linear abrasive 1 in the feeding section 2 and the winding of the linear abrasive 1 in the winding section 7 are performed while synchronizing the motors 6 and 10, or as necessary. It is also possible to implement by driving only the motor 10 of the winding unit 7.

In addition, by reversing the motors 6 and 10 by a switching device (not shown), the linear abrasive 1 is wound back to the winding section 7 without rewinding the linear abrasive 1. While sending the abrasive material 1 as it is to the feeding unit 2 side (that is, by winding it up on the feeding unit 2 side), the linear abrasive material 1 is caused to travel between the winding unit 7 and the feeding unit 2. It is also possible to carry out.

The pressing member 12 is shown in FIGS. 2 (a) and 2 (b).
As shown in FIG.
And a roller 15 formed of an elastic material such as polyurethane is rotatably attached to the recess 14 by a shaft 16. The outer peripheral surface of the roller 15 is provided with a U-shaped annular groove 17 as a groove having a width smaller than the diameter of the linear abrasive 1.

Now, a method of polishing the molding surface 19 of the lens molding die 18 as an object to be polished by the polishing apparatus 20 having the above configuration will be described with reference to FIG.
This will be described together with (b).

The molding surface 19 of the lens molding die 18 is N
By the required cutting and grinding with a C lathe, etc.
This is a high-precision aspherical shape processed, and the polishing for finishing the mirror surface to a mirror surface is performed by the polishing apparatus 20.

Now, as shown in FIG.
0, between the feeding portion 2 of the linear abrasive 1 and the winding portion 7 thereof, the traveling direction of the linear abrasive 1 traveling while being fed from the feeding portion 2 to the winding portion 7 and wound up. The lens molding die 18 extends in a direction orthogonal to
And supported rotatably about its rotation center line a.

As shown in FIG. 3B, the linear polishing is performed on the molding surface 19 as the surface to be polished of the lens molding die 18 along the parabolic direction of the paraboloid thereof. The material 1 is pressed by the pressing member 12, and the lens forming die 18 is pressed.
Of the outer peripheral end 1 from the central top 19a on the molding surface 19
The lens molding die 18 is supported so as to swing freely in the direction of arrow B in FIG. 3B so as to move to 9b.

Under these conditions, the lens molding die 1
The means for supporting 8 is not specifically shown, but can be supported by mechanical means.

In the above configuration, the lens molding die 18 is rotated at a constant speed about the rotation center line A, and is oscillated in the direction of the arrow B in FIG. The linear abrasive material 1 of the polishing device 20 is forcibly pressed against the molding surface 19 of the lens forming die 18 via the pressure welding tool 12, and the feed unit 2 and the winding unit 7 of the polishing device 20 are pressed. Drive the motors 6 and 10,
By moving the linear abrasive 1 between the linear abrasives 1
The linear abrasive 1 can be uniformly slid over the entire surface of the molding surface 19 through the swinging and rotating motions of the lens molding die 18 accompanying the traveling of the lens. The surface 19 can be polished to a mirror surface.

As shown in FIGS. 2 (a) and 2 (b), the linear abrasive 1 is pressed against the molding surface 19 by the linear groove 17 of the roller 15 provided at the tip end of the main body 13 of the pressure welding tool 12. The linear abrasive 1 is pressed onto the molding surface 19 in a state close to point contact via a support arm (not shown) that engages with the upper side of the abrasive 1 and supports the press-contacting device 12 so as to be vertically movable,
The pressure contact force is adjusted and controlled by controlling by a control unit (not shown) of a support arm for supporting the pressure welding device 12 and a pressure sensor (not shown) provided in a vertical movement mechanism (not shown) of the support arm. .

(Embodiment 2) FIG. 4 shows Embodiment 2 of the present invention. In this embodiment, a lens to be polished has a non-spherical concave spherical surface. Face 2
1 illustrates a polishing method for a lens molding die 22 including the first mold 1. The polishing apparatus 20 has the same configuration as in the first embodiment.

In this embodiment, similarly to the first embodiment, the lens-forming mold 22 as the object to be polished is erected with the lens-forming surface 21 as the surface to be polished facing upward. It is supported under the condition, and is supported so as to rotate and swing freely.

Thereafter, as shown in FIG. 4, the linear abrasive 1 travels between the feeding section 2 and the winding section 7 and the traveling linear abrasive 1 is rotated via a pressure welding tool 12. Further, it can be forcibly pressed against the lens molding surface 21 of the swinging lens molding die 22.

The polishing apparatus 20 is fixed at a fixed position, but by rotating and swinging the lens forming surface 21 as the surface to be polished, the pressing member 12 is pressed against the lens forming surface 21.
The linear abrasive 1 forcibly pressed into a point contact state by the roller 15 is uniformly slid over the entire surface of the lens molding surface 21 with the rotation and sliding movement of the lens molding die 22. The mirror polishing can be performed under the same condition as the lens molding die 18 of the first embodiment.

(Embodiment 3) FIG. 5 shows Embodiment 3 of the present invention. In Embodiment 1, in particular, in Embodiment 1, the lens-forming die 18 is perpendicular to the running direction of the linear abrasive 1. An embodiment in which the lens forming die 18 is polished while being supported in a state parallel to the running plane of the linear abrasive 1 instead of being polished by being supported in an upright state. It is.

As shown in FIG. 5, in the case of this embodiment, a lens-forming mold 18 as an object to be polished is linearly disposed between the feeding section 2 and the winding section 7 of the polishing apparatus 20. Abrasive 1
Of the lens forming die 18 is provided with an inclination angle with respect to the running plane of the lens forming die 18, and the linear abrasive 1 is extended along the circumferential direction of the forming surface 19 as a surface to be polished. After the linear abrasive 1 is pressed into contact with the molding surface 19 so as to be in point contact with the molding surface 19, the lens molding die 18 is rotated at a constant speed around the rotation center line A and is pressed in FIG. In addition to swinging in the direction of arrow C, the feed unit 2 of the polishing apparatus 20
By driving both motors 6 and 10 of the winding section 7, the linear abrasive 1 travels between the two sections 2 and 7, and the linear abrasive 1 is applied to the entire molding surface 19 of the lens forming die 18. By sliding,
As in the first embodiment, the molding surface 19 can be uniformly mirror-finished.

In the case of the third embodiment, depending on the method of the first embodiment (particularly, the method in which the polishing apparatus 20 is fixed at a fixed position) such as an aspheric surface having a Schmidt-shaped surface to be polished. This is a particularly effective method when it is difficult or impossible to bring the linear abrasive 1 into sliding contact with the entire surface to be polished by the swinging motion of the surface to be polished and the running of the linear abrasive 1. .

(Embodiment 4) FIG. 6 shows Embodiment 4 of the present invention. In this embodiment, in particular, the lens-forming die 18 as an object to be polished is rotated at a fixed position. In addition to supporting freely, the feeding unit 2 and the winding unit 7 of the polishing device 20 are supported so as to be vertically movable, and the pressing member 12 corresponds to the spherical shape of the lens forming surface 19 as the surface to be polished. 6 shows a method of polishing by swinging in the direction of arrow D shown in FIG.

Thus, the feeding unit 2 and the winding unit 7 of the polishing apparatus 20 are driven to move the linear abrasive 1 from the feeding unit 2 in the direction of the winding unit 7 and to mold the lens. The lens forming die 18 rotates by rotating the linear abrasive 1 traveling downward through the rollers 15 of the pressing member 12 while rotating the linear abrasive 18 at a fixed position about the rotation center line a. Face 1
9 is pressed.

The linear abrasive 1 which is forcibly pressed against the lens forming surface 19 by pressing the pressing member 12 is pressed against the lens forming surface 19 in a point contact state. 6 is pressed so as to be uniformly pressed from the central top portion 19a to the lower peripheral portion 19b.
Rocking motion between the two directions of arrow.

During the swinging movement of the pressing member 12, as the pressing member 12 swings between the central top portion 19a and the lower peripheral portion 19b of the lens forming surface 19, the feeding portion 2 and the winding portion disposed at both ends thereof. When the fixing member 7 is fixed at a fixed position, the pressing position of the running linear abrasive 1 against the lens forming surface 19 by the pressing member 12 moves from a fixed point, and the pressed position is maintained at a fixed point. As shown in FIG. 6, the feeding unit 2 or the winding unit 7 is polished while being moved up and down in accordance with the swinging movement of the press-contacting tool 12, as shown in FIG.

Incidentally, as a method of swinging the pressure welding tool 12 along the shape of the lens molding surface 19, for example, the pressure welding tool 12 is held by a tool holder or the like having an NC driving device, or the pressure welding tool 12 itself is directly held. It can be implemented by a method such as equipping an NC drive device.

The other method is performed by the same method as in the first embodiment, and the description is omitted.

(Fifth Embodiment) FIG. 7 shows a fifth embodiment of the present invention. In the fifth embodiment, in particular, the fifth embodiment comprises a Schmitt-shaped lens molding surface 24 by the method of the fourth embodiment. This shows a method of polishing the lens molding die 23.

The respective parts of the polishing apparatus 20 operate in the same manner as in FIG. 6 of the fourth embodiment, and the lens forming surface 24 as the surface to be polished to be processed by the lens forming die 23 as the rotating object to be polished. 7 is swung in the direction of the arrow E in FIG. 7 to forcibly press the linear abrasive 1 on the lens forming surface 2 with the same effect as in the fourth embodiment.
4 can be uniformly mirror-finished.

In particular, according to the method of the present embodiment, as compared with the third embodiment shown in FIG. This is effective when the surface to be polished has a shape such as a Schmidt shape.

In the polishing method according to Embodiments 1 to 5 described above, as in the case of general polishing,
Since the amount of polishing increases in proportion to the pressure (polishing pressure) and the speed (slip speed), the contact pressure of the linear abrasive 1 on the molding surfaces 19, 21, and 24 as the surfaces to be polished is determined by the pressure welding tool. 1
2 and the molding surface 1
9,21,24 rotation speed and running speed of linear abrasive 1
By varying the number of revolutions, the molding surfaces 19, 21, 24
Also, since the slip speed of the linear abrasive 1 can be adjusted, the polishing amount can be arbitrarily adjusted and uniform polishing can be easily performed.

Further, during the polishing operation, the linear abrasive 1 is moved while being moved from the feeding section 2 to the winding section 7, and a new linear abrasive is formed on the contact surface with the forming surfaces 19, 21, 24. Abrasive 1
Is supplied continuously, so that the clogging can be performed while eliminating the clogging. Therefore, it is possible to stabilize the polishing ability during the polishing process and, like the polishing method using a grindstone,
It is possible to prevent the occurrence of a processing error due to a change with time of the grindstone.

When the roller 15 of the pressing member 12 is formed of an elastic material such as polyurethane as described above, the adaptability of the linear abrasive 1 to the surface to be polished can be improved.

The technical idea having the following configuration is derived from the specific embodiment described above. (Supplementary Note) (1) A linear abrasive having an abrasive is caused to travel between a feeding part and a winding part, and the linear abrasive and the surface to be polished are moved between the traveling steps of the linear abrasive. A method for polishing a spherical or aspherical surface, wherein the polishing is performed while relatively moving and forcibly pressing the linear abrasive onto a surface to be polished in a state close to point contact.

(2) A linear abrasive containing an abrasive, a feeding section provided with a feed reel for feeding the linear abrasive, and the linear abrasive sent out from the feeding section, A winding unit having a take-up reel that winds at a predetermined interval from the feeding unit, and the linear abrasive material running between the feeding unit and the winding unit is forcibly pressed against a surface to be polished. A spherical and aspherical polishing device, comprising:

(3) The polishing apparatus for spherical and aspherical surfaces according to (2), wherein the pressing member is vertically movable in a direction perpendicular to a running direction of the linear abrasive.

(4) The polishing apparatus for spherical and aspherical surfaces according to (2) or (3), wherein the pressing member is swingable along the shape of the surface to be polished.

(5) A linear abrasive material containing an abrasive, a feed unit provided with a feed reel for feeding the linear abrasive material and capable of moving up and down, and the linear polishing sent out from the feed unit A take-up reel, which is provided with a take-up reel for taking up the material at a predetermined interval from the feed unit, and a vertically movable take-up unit, and the linear abrasive material running between the feed unit and the take-up unit is polished. A spherical and aspherical polishing apparatus, comprising: a vertically movable and oscillating pressure-contacting tool forcibly pressing against a surface.

According to the polishing method for spherical and aspherical surfaces described in the appendix (1), the linear abrasive is pressed into contact with the spherical or aspherical surface to be polished via a pressure welding tool to make partial contact with the line. Polishing of the polished surface by relatively moving the polished material and the surface to be polished allows the linear abrasive to be well adapted to the polished surface of a spherical or aspherical surface that has been cut or ground. It is possible to perform uniform mirror polishing by a relatively simple means without impairing the high precision of the cut or ground shape.

According to the spherical and aspherical polishing apparatuses of the appendices (2) to (4), the linear abrasive is pressed into contact with the spherical or aspherical surface to be polished via the pressure welding tool, and is partially pointed. When the linear abrasive is polished by cutting or grinding, the linear abrasive and the surface to be polished are moved relative to each other to polish the surface to be polished. The surface can be fitted while being well adapted, and uniform mirror polishing can be performed by a relatively simple means without impairing the high precision of the cut or ground processed high precision shape.

According to the spherical and aspherical polishing apparatus of the appendix (5), the feed portion and the take-up portion of the linear abrasive can be moved in the vertical direction. It is possible to handle even if it is, and to maintain the pressing position of the linear abrasive in the pressing tool on the whole surface to be polished constant, without impairing the high precision shape of the cut or ground, uniform Mirror polishing can be performed.

[0074]

As described above, according to the method for polishing a spherical surface or an aspherical surface according to the first aspect of the present invention, a linear abrasive is applied to a spherical or aspherical surface to be polished via a pressure welding tool. Since the linear abrasive and the surface to be polished are relatively moved to polish the surface to be polished, the linear abrasive is cut or ground. Alternatively, it can be fitted to an aspheric surface to be polished while being well adapted, and uniform mirror polishing can be performed by relatively simple means without impairing high-precision cut or ground precision.

Also, since the linear abrasive is running during polishing, a new abrasive is always supplied during polishing, so that the polishing ability during polishing is stable, and the processing error due to the change with time of the abrasive is reduced. Will not occur.

According to the method for polishing spherical and aspheric surfaces according to the second aspect of the present invention, since the linear abrasive which is kneaded or impregnated with the abrasive is used as the linear abrasive, the abrasive supplied from outside is used. Are not required, so that there is no need for a device for pouring and applying the polishing agent.

According to the polishing method for spherical and aspheric surfaces according to the third aspect of the present invention, the linear abrasive is forcibly pressed into contact with the surface to be polished through the vertically moving or oscillating pressing member. Since it is a polishing process that polishes while making point contact, it has good followability to the shape of the surface to be polished, and smoothly to various aspherical shapes such as parabolic surface and Schmidt shape or concave or convex shape Polishing can be performed.

According to the method for polishing spherical and aspherical surfaces according to the fourth aspect of the present invention, the linear abrasive is pressed against the surface to be polished having a spherical or aspherical shape via a press-fitting tool to partially contact the surface. The polishing is performed by relatively sliding or rotating the linear abrasive and the surface to be polished, so that the linear abrasive has a spherical or aspherical shape which has been cut or ground. It is possible to perform uniform mirror polishing by a relatively simple means without impairing the precision of the cut or ground high-precision shape.

According to the method for polishing a spherical surface and an aspherical surface according to the fifth aspect of the present invention, since the surface to be polished is supported in a direction parallel to the running plane of the linear abrasive, the surface having a large asphericity is polished. Even if it is a surface, the linear abrasive can be pressed against the entire surface to be polished in a point contact state, and uniform mirror polishing can be performed without impairing high precision shape precision after cutting or grinding. .

According to the polishing method for spherical and aspherical surfaces according to the sixth aspect of the present invention, since the feeding portion and the winding portion of the linear abrasive can be moved in the vertical direction, the surface having a large asphericity can be obtained. It is possible to cope with even the polished surface, and it is possible to keep the pressure contact position of the linear abrasive in the pressure welding tool constant over the entire surface to be polished.

According to the polishing apparatus for spherical and aspherical surfaces according to the seventh aspect of the present invention, the linear abrasive is pressed into contact with the spherical or aspherical surface to be polished via the pressure welding tool to partially contact the surface. The linear abrasive is moved relative to the surface to be polished to polish the surface to be polished, so that the linear abrasive has a spherical or aspherical surface to be polished or ground. It is possible to perform a uniform mirror polishing by a relatively simple means without deteriorating the precision of the cut or ground processed high-precision shape.

According to the spherical and aspherical polishing apparatus of the eighth aspect of the present invention, since the roller provided with the groove having a width smaller than the diameter of the linear abrasive is rotatably attached to the pressing member, the groove is formed in this groove. While engaging the linear abrasive and projecting the surface to be polished from the roller, holding the linear abrasive without impeding the running of the linear abrasive with the pressure-welding tool, spotting the side of the linear abrasive protruding from the roller. The polished surface can be polished by pressing against the polished surface in a contact state.

According to the ninth aspect of the present invention, since the roller of the pressing member is formed of an elastic material such as polyurethane, the adaptability of the linear abrasive to the surface to be polished is improved. Can be improved.

[Brief description of the drawings]

FIG. 1 shows a polishing apparatus used for carrying out a polishing method of the present invention, wherein (a) is a side view and (b) is a plan view.

FIGS. 2A and 2B show a pressure welding tool in the polishing apparatus according to the embodiment of the present invention, wherein FIG. 2A is a partially enlarged front view, and FIG.

FIG. 3 is an explanatory view showing Embodiment 1 of the polishing method of the present invention.

FIG. 4 is an explanatory view showing Embodiment 2 of the polishing method of the present invention.

FIG. 5 is an explanatory view showing a polishing method according to a third embodiment of the present invention.

FIG. 6 is an explanatory view showing a polishing method according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory view showing Embodiment 5 of the polishing method of the present invention.

FIG. 8 is an explanatory view showing a conventional polishing method.

FIG. 9 is an explanatory view showing a conventional polishing method.

FIG. 10 is an explanatory view showing a conventional polishing method.

FIG. 11 is an explanatory view showing a conventional polishing method.

FIG. 12 is an explanatory view showing a conventional polishing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Linear abrasive 2 Feeding part 3 Sending reel 4, 11 Rotation drive shaft 5, 9 Base part 6, 10 Motor 7 Take-up part 8 Take-up reel 12 Pressure welding device 13 Pressure welding device main body 14 Depression 15 Roller 16 Shaft 17 Ring Grooves 18, 22, 23 Lens molding dies 19, 21, 24 Lens molding surface 20 Polishing device

Claims (9)

[Claims] 1. A linear abrasive having an abrasive is caused to travel between a feeding portion and a winding portion, and the linear abrasive and a surface to be polished are moved relative to each other during a traveling process of the linear abrasive. And polishing the surface to be polished while forcibly pressing the linear abrasive to the surface to be polished. 2. A linear abrasive comprising the abrasive is prepared by kneading an abrasive such as diamond, chromium oxide or calcined alumina into a linear member such as a metal wire, a glass wire, a synthetic fiber or a natural fiber, 2. The method for polishing a spherical surface and an aspherical surface according to claim 1, wherein the polishing method is formed by impregnation. 3. The means for forcibly pressing the linear abrasive on the surface to be polished is pressed via a pressing member which vertically moves or swings in a direction perpendicular to the running direction of the linear abrasive. The method for polishing spherical and aspherical surfaces according to claim 1, wherein: 4. The linear abrasive material travels between the feeding unit and the winding unit fixed at a predetermined interval, and the polished surface of the object to be polished moves the linear abrasive material. 2. The method for polishing spherical and aspherical surfaces according to claim 1, wherein the polishing is performed while being supported while being erected in a direction perpendicular to the direction, and supported while being rotated and rocked. 5. The linear abrasive material travels between the feeding unit and the winding unit fixed at a predetermined interval, and the polished surface of the object to be polished moves the linear abrasive material. 2. The method for polishing a spherical surface and an aspherical surface according to claim 1, wherein the polishing is carried out in a direction parallel to a plane and is supported while rotating and oscillating. 6. The linear abrasive is moved vertically while moving a feed portion and a take-up portion of the linear abrasive, rotating the surface to be polished, and forcibly pressing the linear abrasive against the surface to be polished. 2. The method for polishing a spherical surface and an aspherical surface according to claim 1, wherein the pressing member is swung along the surface to be polished. 7. A linear abrasive having an abrasive, and a feeding section having a delivery reel for feeding the linear abrasive,
A winding unit including a winding reel that winds the linear abrasive material sent from the feeding unit at a predetermined interval from the feeding unit; and a unit that travels between the feeding unit and the winding unit. And a pressing tool for forcibly pressing the linear abrasive onto the surface to be polished. 8. The spherical surface according to claim 7, wherein the pressing member is configured by rotatably mounting a roller having a groove having a width smaller than a diameter of the linear abrasive on an outer peripheral surface at a tip end. , Aspheric polishing equipment. 9. The polishing apparatus for spherical and aspherical surfaces according to claim 8, wherein the roller rotatably attached to the tip of said pressing member is made of an elastic material such as polyurethane.