KR20040035068A - Precision centripetal grinder - Google Patents

Abstract

PURPOSE: A high accuracy centripetal grinder is provided to process the surface of the micro-lens precisely and conveniently through the precision gauge by sliding up and down with turning an upper tool, transferring a grinder head part accurately with an LM guide, and tilting the spindle driving unit. CONSTITUTION: A micrometer head(10) is installed in the end of an upper bracket(12) fixed to a bracket, and the end of a tension spring(18) is mounted in the other end of the upper bracket. The tension spring is installed in a plate(34), and the plate is fixed to a center housing(56) and turned around a pin(32). A bracket(26) is installed in the end of the micro head with moving up and down, and assembled with an indicator(78) setting the grinding thickness of a lens(84). A spring fixing plate(30) is fastened in the lower part of the bracket, and a tension spring(28) is mounted in the spring fixing plate. A detection rod(70) of the indicator is contacted to a setting bolt(68) installed in the plate, and the setting bolt is contacted to a pressure pin shaft(52). A rotating spindle shaft(54) and the vertically moving and rotating pressure pin shaft are inserted to the center housing, and a pressure pin(48) mounting an upper tool(80) is fixed to the lower part of the pressure pin shaft, and a rubber cover(50) is fastened to the lower part of the spindle shaft. The lower part of the rubber cover is fixed to the pressure pin shaft.

Description

High Precision Centripetal Grinding Machine {PRECISION CENTRIPETAL GRINDER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens polisher, and more particularly, to an ultra-precision centrifugal polisher configured to precisely polish the surface of a small optical lens.

Typically, the manufacture of lenses used in optical instruments such as cameras, compact disk drivers, facsimile and sights, endoscopes, telescopes, etc. is used to rough cut a certain size of material and smooth the surface. The grinding process is completed.

At this time, to grind the surface of the lens is used a lens polishing machine (generally referred to as a "centre polishing machine"), such a lens polishing machine is largely composed of two parts. That is, the lens grinder is composed of a cylinder block having a rotating member for fixing and rotating the lens to be polished to perform the polishing process, a motor for allowing the rotating member to rotate, and a polishing member for polishing the lens. The grinding machine is usually operated by hand.

On the other hand, the main conditions required in the optical industry related to such a lens polishing machine require the ability to improve the surface finish of the lens without changing the curvature of the lens surface, and preferably the lens polishing operation is a small groove of the lens. This is to remove traces during processing and to maintain the specified curvature perfectly.

Accordingly, the present invention has been made in consideration of general issues as described above, and an object thereof is to provide an ultra-precision centrifugal polishing machine that can polish the surface of a lens to maintain a predetermined curvature perfectly.

Another object of the present invention is to provide an ultra-precision centripetal polishing machine that can increase the precision of the polishing process when polishing the lens surface.

Still another object of the present invention is to provide an ultra-precision centrifugal polishing machine that can precisely process a micro lens by configuring the upper tool to slide up and down while rotating.

Still another object of the present invention is to provide an ultra-precision centripetal grinder capable of precisely transferring the polishing head portion in which an upper tool is installed using an LM guide.

Still another object of the present invention is to provide an ultra-precise centripetal polishing machine that can polish a lens surface precisely by a set dimension using a precision scale gauge.

Still another object of the present invention is to provide an ultra-precision centripetal polishing machine capable of always tilting a spindle drive having a lower tool installed therein.

Still another object of the present invention is to provide an ultra-precision centripetal polisher configured to secure a wide work space and to implement convenience of work.

The present invention in the first aspect for achieving the object as described above;

In a conventional lens polishing apparatus, the upper tool is installed and the apparatus for polishing the surface of the lens while moving vertically, vertically,

A micro head is installed at one end of the upper bracket fixed to the bracket, and one end of the tension spring is installed at the other end of the upper bracket, and the other end of the tension spring is installed at one end of the plate. The other end is fixed to the center housing and rotates about the pin;

At the end of the microhead, a bracket having an indicator for setting the polishing thickness of the lens is installed and moved up and down. A spring fixing plate is fixed to the bottom of the bracket, and a tension spring is provided at one end of the spring fixing plate. Installed;

A sensing bolt of the indicator is in contact with a setting bolt installed on the plate, and the setting bolt is in contact with a pressure pin shaft;

Inside the center housing, a spindle shaft for rotating motion and a pressure pin shaft for vertical and rotational motion are sequentially inserted, and a pressure pin for installing an upper tool is fixed to a lower end of the pressure pin shaft, A rubber cover is fixed to the lower end, and the lower end of the rubber cover is fixed to the pressure pin shaft.

1 is a view schematically showing the configuration of a super precision centripetal grinding machine according to an embodiment of the present invention.

FIG. 2 is a front view showing the configuration of the polishing head portion A shown in FIG. 1. FIG.

FIG. 3 is a side view showing the configuration of the polishing head portion A shown in FIG. 2. FIG.

4 is a plan view showing the installation of the tension spring (18, 28) and the bracket (20, 26) shown in FIG.

FIG. 5 is a front view showing the configuration of the head driving unit B shown in FIG. 1. FIG.

FIG. 6 is a side view showing the configuration of the head driving unit B shown in FIG. 5. FIG.

7 is a plan view showing an installation state of the upper slide 110 shown in FIG.

8 is a front view showing the installation state and configuration of the spindle drive (C) and the spindle swing (D) and the tilting drive (E) shown in FIG.

9 is a side view of the drive unit shown in FIG. 8;

10 is a cross-sectional view showing the configuration of the tilting drive shown in FIG.

11 is a cross-sectional view of "A-A" shown in FIG.

<Description of the symbols for the main parts of the drawings>

A: Polishing head portion B: Head driving portion

C: spindle drive D: spindle swing

E: Tilting Drive

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the reference numerals to the components of the drawings, it should be noted that the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the terms to be described below are terms defined in consideration of functions in the present invention, and may be changed according to the intention or custom of a user or a designer, and the definitions should be made based on the contents throughout the present specification.

According to an embodiment of the present invention, the configuration of the ultra-precision centrifugal polisher characterized above is as shown in FIG. 1. Referring to FIG. 1, the device to be implemented in the present invention is a device for accurately polishing a surface of a lens by a predetermined dimension, and its configuration includes a polishing head portion A, a head driving portion B, a spindle driving portion C, and a spindle. It is composed of a swinging portion (D), and a tilting driving portion (E).

The polishing head portion A is a device having a pressure pin 48 to which the upper tool 80 is coupled and polishing the surface of the lens 84 while vertically moving in the up / down direction.

The head driving portion B is connected to the above-described polishing head portion A and vertically moves the polishing head portion A by the driving force of the air cylinder 114.

The spindle drive C is composed of a lower tool 82 on which the lens 84 is seated, a spindle shaft 216 and a motor 200 for rotating the lower tool 82 at a constant speed, and the polishing described above. The surface of the lens 84 is polished in association with the head portion A. FIG.

The tilting driver E is a device for always moving the above-mentioned spindle driver C to the initial position after the lens polishing and tilting by a predetermined angle, and the spindle swinger D is a tilting driver E and a spindle driver ( C) is a device for connecting.

Meanwhile, the detailed configuration and operation of the above-described driving units will be described in detail with reference to FIGS. 2 to 11.

2 to 4 is a view showing the configuration of the above-described polishing head portion (A), the micro head (10) is a commonly used "micrometer head" is installed in the upper bracket 12 in the present invention in the polishing head portion In this case, the upper bracket 12 is fixed to the bracket 20 with bolts.

The adjusting bolt 14 is penetrated to one end of the upper bracket 12, and the adjusting nut 16 is fastened to the adjusting bolt 14. A tension spring 18 is connected to the end of the adjustment bolt 14, and the other end of the tension spring 18 is connected to an adjustment screw 22 fastened to the plate 34. At this time, the adjusting nut 16 adjusts the tension force of the tension spring 18, the tension spring 18 serves to always return the plate 34 to the original position.

On the other hand, the end of the above-described microhead 10 is in contact with the steel ball 76 is inserted into the upper surface of the bracket 26, the bracket 26 is in accordance with the operation of the microhead (10) Go down. That is, as shown in FIGS. 3 and 4, the spring fixing plate 30 is fastened to the bottom of the bracket 26 by a bolt, and a tension spring 28 is connected to one end of the spring fixing plate 30. The other end of the tension spring 28 is connected to the fixing pin 24. In addition, an indicator fixture 72 is fastened to the bracket 26 by a bolt, and a rod tube 74 of the indicator 78 is fixed to the bracket 72 by a bolt 73. Due to this configuration, when the microhead 10 is turned, the bracket 26 moves downward, and the indicator fixture 72 also moves downward together. At this time, the sensing rod 70 of the indicator 78 is inserted into the rod tube (74).

The indicator 78 is an instrument for weighing and measuring according to a guideline, which is also commonly referred to as a signal gauge. The indicator 78 sets a polishing thickness when polishing the surface of the lens 84. It is an indicator to indicate when polished by thickness. At this time, the sensing rod 70 of the indicator 78 is in contact with the setting bolt 68 installed on the plate 34, the other end of the setting bolt 68 is in contact with the stopper pin (64).

Meanwhile, as shown in FIG. 3, the plate 34 has the right end fixed to the tension spring 18 and the other end fastened to the center housing 56 by bolts 66. In addition, a pin 32 is inserted in the middle portion of the plate 34, and the plate 34 is rotated about the pin 32.

A pressure pin shaft 52 and a spindle shaft 54 of a rod type having an empty inside are inserted into the center of the center housing 56, and preferably, the pressure pin shaft 52 is inserted into the spindle shaft 54. ) Is inserted. At this time, the pressure pin 48 is fixed to the lower end of the pressure pin shaft 52, the pressure pin 48 is provided with an upper tool 80. In addition, a bellows-type rubber cover 50 is fixed to the lower end of the spindle shaft 54, and the lower end of the rubber cover 50 is fixed to the pressure pin shaft 52 described above. This is to allow the spindle shaft 54 to rotate at the same time as the 52 is rotated.

The shaft fixing nut 58 is fastened to the upper side of the aforementioned spindle shaft 54, and the inner circumferential surface of the fixing nut 62 is fastened to the shaft fixing nut 58, and the outer circumferential surface of the fixing nut 62 is the center housing. It is fastened to the upper inner peripheral surface of 56. In addition, an angular bearing 46 is inserted into the upper and lower outer peripheries of the spindle shaft 54, and an inner ring collar 44 and an outer ring collar 42 are inserted between the angular bearings 46, respectively. This structure prevents the spindle shaft 54 from moving when the pressure pin shaft 52 is vertically moved in accordance with the up / down operation of the plate 34 described above, and also the pressure pin shaft 52 and the spindle shaft 54. Is to allow to rotate together.

The polishing head portion A having the configuration as described above is connected to the head driving portion B as shown in FIG. 1, and preferably, the head bracket 40 is fixed to the center housing 56 by bolts. Due to this structure, the polishing head portion A moves vertically in the up / down direction. Meanwhile, the detailed configuration of the head driving unit B will be easily understood by the following description.

5 to 7 are views showing the detailed configuration of the head driving unit (B) in the ultra-precision centrifugal polishing machine according to the present invention. As shown in each of the drawings, the hand wheel 100 has a screw 106 is connected, the screw 106 is provided with an upper slide 110 is moved in the up / down direction and also move later It is fixed at the position by the handle lever 112. At this time, the coupling shaft 108 is integrally formed at one end of the handle lever 112 and the upper slide 110 is fixed to the screw 106 so that the upper slide 110 cannot move when the lens is polished. .

In addition, one end of the upper slide 110 is provided with a point 128 having a sharp end, and this point 128 indicates the scale of the scale 126 attached to the column 120. On the other hand, the upper slide 110 having the above structure serves to finely adjust the thickness of the lens 84, this role will be clearly understood by the operation description to be described later.

As described above, the upper slide 110 is formed in an “L” shape, and both ends thereof have first and second guide shafts 124 and 104 fitted therein, and the guide shafts 124 and 104 are moved up and down. Vertical movement. In addition, an air cylinder 114 is installed on the bottom of the upper slide 110, and the piston rod 116 of the air cylinder 114 is fastened to the head bracket 40 by a mood bolt 118. At this time, one side end of the head bracket 40 is fixed to the center housing 56 of the polishing head portion (A).

8 to 11 are views showing the configuration and connection of the spindle drive (C), spindle swing (D) and the tilting drive (E) in the ultra-precision centrifugal polishing machine according to the present invention.

Referring to the drawings, the spindle drive C includes a motor 200 that generates a predetermined driving force, and a pulley 202 is inserted into a shaft of the motor 200. The pulley 202 is connected to the spindle pulley 206 by a polymax belt 204, the spindle pulley 206 is inserted into the spindle shaft 216, the lower tool 82 is installed at the upper end, An angular bearing 208 is inserted into the upper and lower portions of the spindle shaft 216. An inner ring collar 210 and an outer ring collar 212 are positioned between the angular bearings 208, and the collars 210 and 212 surround the outer circumferential surface of the spindle shaft 216. On the other hand, all of these components are inserted into the inside of the center housing 214, the center housing 214 is fixed to the fixed bracket 218 of the "L" shaped by bolts, the fixing bracket 218 The spindle swing portion D is assembled.

That is, the spindle swing portion (D) has a swing shaft (300) which is fastened to the fixed bracket (218) by bolts to form a body and rotates only by a set angle, and the swing shaft (300) is a swing arm (302). Connected with That is, as shown in Figure 9, the swinging arm 302 is seated on the upper / lower surface of the swinging shaft 300, and then fastened with a bolt. In addition, one side end of the swinging arm 302 is connected to the tilting driving unit (E) (preferably the swinging arm 302 is connected to the crankshaft 444) by the connecting pin 304, The detailed configuration of the tilting drive unit E is as described later.

The tilting driving part E has an empty inside and a handle bracket 404 coupled to a hand wheel 402 at one end thereof, and a handle shaft assembled to the hand wheel 402 inside the handle bracket 404. 408 is provided. Ball bearings 406 are inserted at both ends of the handle shaft 408 and bevel gears 410 are installed at the other ends. The bevel gear 410 is bevel gear 412 installed in the lead screw 416 is engaged at a right angle, the screw screw 418 is fastened to the lead screw 416, the screw nut 418 is a plate One end of 434 is fixed. This connection structure is for setting the position of the spindle drive C when polishing the surface of the lens 84, preferably the initial polishing position when polishing the surface of the lens 84.

A motor 448 for generating a predetermined driving force is installed on the rear surface of the plate 434 described above, and the drive shaft 438 of the motor 448 penetrates the plate 434. The drive shaft 434 is connected to the cam base 436, they are fastened with a bolt to form a body.

The cam base 436 is formed in the shape of " diffuser " having a central portion open, and an eccentric shaft 442 is inserted into the central portion. At this time, the adjusting screw 432 is inserted into the upper side (on the drawing) of the chembase 436, and the adjusting screw 432 is connected to one end of the eccentric shaft 442. That is, the eccentric shaft 442 is formed in a "T" shape, and at one end of the eccentric shaft 442 is formed a cylindrical hole 443 having a thread along the inner circumferential surface, and the hole 443 is The adjusting screw 432 is fastened. This configuration is for setting the eccentric angle of the eccentric shaft 442, for example, by turning the adjustment screw 432 to move the eccentric shaft 442 upward, the tilting angle becomes smaller, and the downward tilting angle As it becomes larger, the tilting range of the spindle drive B is determined accordingly.

One side end of the slide body 440 and the crank shaft 444 and the lock bolt 450 are inserted into the eccentric shaft 442 sequentially. At this time, the slide body 440 serves to hold the eccentric shaft 442, the lock bolt 450 prevents the departure of the crank shaft 444. The bearing 452 is inserted between the crank shaft 444 and the eccentric shaft 442, and the other end of the crank shaft 444 is connected to the swinging arm 302.

In the aforementioned plate 434, the proximity sensor 426 is installed by the sensor bracket 425, as shown in FIG. 11, and the cam base 436 has a long hole 430 formed therein. The fastening bolt 428 is fixed. This structure is intended to detect the number of times the cam base 436 has rotated and to allow the rocking arm 302 described above to move to the first position after the lens polishing.

Hereinafter, the operation state of the ultra-precision centrifugal polisher of the present invention having the configuration as described above will be described in detail with reference to FIGS. 1 to 11.

First, before operating the ultra-precision centrifugal polishing machine shown in FIG. Must be set. That is, as shown in FIG. 8, when the handle installed in the hand wheel 402 is turned, the handle shaft 408 rotates, and the driving force is transmitted to the lead screw 416 by the bevel gears 410 and 412. Accordingly, the screw nut 418 is vertically moved up or down by the lead screw 416, thereby causing the swing arm 302 to be horizontal.

Thereafter, as shown in FIG. 10, after turning the adjusting screw 432 to set the position of the eccentric shaft 442 to control the tilting angle (polishing angle) of the lower tool 82, the handle lever shown in FIG. 5 ( 112 to set the falling distance of the polishing head portion A in accordance with the lens thickness. That is, when the handle lever 112 is turned, the upper slide 110 moves up / down by the screw 106 and the moving distance is confirmed by the scale 126 and the point 128 shown in FIG. For example, this is described below. For example, when the lens thickness of 7 mm is to be polished, the handle lever 112 is rotated so that the upper slide 110 moves upward by 2 mm, preferably the point 128. ) Until it points to the scale (2 mm) indicated on the scale 126.}

Next, when the microhead 10 shown in FIG. 3 is operated to set the polishing depth, and preferably, the microhead 10 is turned, the bracket 26 on which the indicator 78 is installed moves downward and simultaneously senses. The rod 70 is inserted into the rod tube 74.

Thereafter, as shown in FIGS. 2 to 3, when the lens 84 is placed on the lower tool 82, the ultra-cylindrical grinding machine is operated, and the air cylinder 114 shown in FIG. 5 has the head bracket 40. The upper tool 80 of the polishing head portion A fixed to the head bracket 40 is brought into contact with the surface of the lens 84 at the same time.

Subsequently, the spindle shaft 216 shown in FIGS. 8 and 9 rotates at a constant speed by the driving force of the motor 200, and at the same time, the eccentric shaft 442 shown in FIG. 10 is also fixed by the driving force of the motor 448. It will rotate at speed. Accordingly, the spindle drive C moves by a tilting angle set around the connecting pin 304 connecting the crankshaft 444 and the swing arm 302 and at the same time the spindle drive C rotates at a constant speed. Done.

Subsequently, if the above-described process continues and the surface of the lens 84 shown in FIG. 3 is polished by 2 mm, the sensing rod 70 inserted into the rod tube 74 of the indicator 78 is preferably a lens. As the surface of the 84 is polished little by little, the center housing 56 which protrudes to the outside and is fixed to the plate 34 moves downwardly about the pin 32. At this time, the pressure pin shaft 52 and the spindle shaft 54 in which the upper tool 80 is installed are rotated in conjunction with the aforementioned spindle shaft 216 and the pressure pin shaft 52 is vertically moved downward while being rotated. Done.

After that, when the scale of the indicator 78 indicates the set value, that is, when the setting bolt 68 and the sensing rod 70 are dropped, the controller of the centripetal polishing machine determines that the surface of the lens 84 has been polished. The air cylinder 114 shown in FIG. 5 is operated to vertically move the polishing head portion A, and at the same time, the spindle driving portion C and the tilting driving portion E are also stopped. In this case, the proximity sensor 426 shown in FIGS. 9 and 11 checks the number of rotations of the cam base 436, and preferably the position of the fastening bolt 428, so that the cam base 436 does not stop at the initial position. If not, the motor 448 is continuously driven to return to the initial position. The spindle drive C then moves to its initial position.

As described above, the lens polishing apparatus according to the embodiment of the present invention achieves many effects as follows.

First, since the conventional lens polishing apparatus uses a tool for medium / small size, there is a disadvantage in that it does not satisfy the fineness and detail when polishing the micro lens due to the large weight of the polishing head part. The configuration of the polishing head portion as described above solves the conventional problems and also has the advantage that the tool (tool) is configured to slide up and down while rotating to increase the precision of the polishing process when polishing the lens surface .

Secondly, the conventional polishing apparatus directly adjusts the upper and lower slide methods of the polishing head part by the visual sense of the skilled person, but in the present invention, the polishing is performed using the LM guides (first and second guide shafts) and the upper slides. There is an advantage in that the head portion is precisely conveyed and the precise dimension gauge is used to obtain accurate dimensions.

Third, the centripetal grinding machine of the present invention has the effect of minimizing the size of the spindle drive and shortening the length of the spindle shaft to secure a wide working space and to realize the convenience of work.

Fourthly, the conventional polishing apparatus has two left and right swing shaft points for tilting the spindle drive, so the assembly tolerance problem between the two axes is always in the up and down direction, and the inertial energy during tilting There was a problem that the left / right, up / down is not balanced by the present invention, the present invention is configured to tilt the oscillation axis about one axis in one direction so that there is always no change of the point with a constant motion, especially the above-mentioned disadvantages There is a synergistic effect that has been solved dramatically.

Fifth, since the present invention can change the initial position of the spindle drive arbitrarily, the surface of the lens can be polished uniformly, and only the edge of the lens can be polished.

Claims (1)

In a conventional lens polishing apparatus, the upper tool is installed and the apparatus for polishing the surface of the lens while moving vertically, vertically, The micro head 10 is installed at one end of the upper bracket 12 fixed to the bracket 20, and the other end of the tension spring 18 is installed at the other end of the upper bracket 12. The other end of (18) is installed at one end of the plate (34), and the other end of the plate (34) is fixed to the center housing (56) and rotates about the pin (32); At the end of the microhead 10, a bracket 26 having an indicator 78 for setting the polishing thickness of the lens 84 is installed and moved up and down, and a spring is provided at the bottom of the bracket 26. A fixed plate 30 is fixed, and a tension spring 28 is installed at one end of the spring fixing plate 30; A sensing bolt (70) of the indicator (78) is in contact with a setting bolt (68) installed at the plate (34), and the setting bolt (68) is in contact with a pressure pin shaft (52); Inside the center housing 56, a spindle shaft 54 for rotating motion and a pressure pin shaft 52 for vertical and rotational motion are sequentially inserted into the center housing 56, and an upper tool (120) is provided at the lower end of the pressure pin shaft 52. The pressure pin 48 to which the 80 is installed is fixed, and the rubber cover 50 is fixed to the lower end of the spindle shaft 54, and the lower end of the rubber cover 50 is fixed to the pressure pin shaft 52. Ultra-precision centripetal grinding machine characterized by.