CN102513899A

CN102513899A - Single-direction inclined-shaft profiling precision grinding method of array optical elements of micro circular troughs

Info

Publication number: CN102513899A
Application number: CN201110459923XA
Authority: CN
Inventors: 郭兵; 赵清亮; 赵毅; 张海南
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2011-12-31
Filing date: 2011-12-31
Publication date: 2012-06-27
Anticipated expiration: 2031-12-31
Also published as: CN102513899B

Abstract

The invention discloses a single-direction inclined-shaft profiling precision grinding method of array optical elements of micro circular troughs, and relates to a precision grinding method of array optical elements of micro circular troughs. The invention aims at solving the problems that the surface roughness of micro circular troughs ground by the current grinding method of the array optical elements of the micro circular troughs in different feeding directions has large difference, a grinding wheel is easily abraded in processing, and the grinding processing efficiency is low. The single-direction inclined-shaft profiling precision grinding method comprises the following steps of: 1, causing the axis of rotation of a profiling grinding wheel and the upper surface of a workpiece to be ground to form an included angle of 45 degrees, and causing the first lowest point of the profiling grinding wheel to become a grinding center point; 2, causing the workpiece to be ground to feed along the reverse direction of an X axis and to process micro circular troughs of all arrays in a single direction along with a workbench of a precision grinder; 3, and causing the axis of rotation of the grinding wheel and a plane with the surface of the workpiece to form an included angle of 135 degrees, causing the second lowest point of the grinding wheel to become the grinding center point, and then processing the circular troughs according to the step 2. The precision grinding method disclosed by the invention is used for processing array optical elements of the micro circular troughs.

Description

The folk prescription synclinal axis profiling precise grinding process of little arc groove array optical element

Technical field

The present invention relates to a kind of precise grinding process of little arc groove array optical element.

Background technology

Little arc groove array optical element is a key element of making products such as high energy diode laser generator, mobile phone high-performance backlight assembly and high-end projecting apparatus; The lens arra of circular arc can be adjusted light path through refraction action, finally reaches the effect of collimated light path.Duplicate process technology and be the common method of making the little arc groove array optical of high-performance element, the Precision Machining quality of mould that wherein has little arc groove array surface is to final properties of product and cost control decisive role.

At present, little arc groove array optical component mold adopts the processing of twocouese parallel axes profile copy grinding method, and it is parallel with the workpiece to be processed surface promptly to add profiling in man-hour emery wheel rotating shaft.Add the man-hour skive earlier along abrasive grain cutting direction feeding grinding article one arc groove; Article one, emery wheel moved to second arc groove place vertically after the arc groove grinding finished; Along abrasive grain cutting grinding in the other direction second arc groove, in like manner process all arc grooves successively again, as shown in Figure 2.During the little arc groove array of profile copy grinding; Being arranged in parallel of emery wheel rotating shaft and work surface; The abrasive grain cutting track of axial distribution is parallel to each other all the time on the emery wheel; Cause the height fluctuating of the little sword of abrasive grain cutting on the emery wheel can directly duplicate the arc groove surface, make that the arc groove surfacing vestige after the processing is obvious, surface roughness is higher; Simultaneously, emery wheel is that grinding is carried out to arc groove in the center with point of greatest diameter A all the time, need repair behind the abrasion of grinding wheel at once and could continue processing.

To sum up, existing little arc groove array optical element method for grinding grinding vestige is obvious, and surface roughness is higher, and little arc groove surface roughness of different direction of feed grindings differs bigger, reaches 14%～55%; The processing medium plain emery wheel is easy to wear, need repeatedly repair, and grinding efficient is low.

Summary of the invention

The present invention differs big and easy to wear, the inefficient problem of grinding of processing medium plain emery wheel for the little arc groove surface roughness that solves the different direction of feed grindings of existing little arc groove array optical element method for grinding, and then a kind of folk prescription synclinal axis profiling precise grinding process of little arc groove array optical element is provided.

The present invention solves the problems of the technologies described above the technical scheme of taking to be:

The folk prescription synclinal axis profiling precise grinding process of little arc groove array optical element of the present invention is realized according to following steps:

Step 1, workpiece to be ground is fixed on the upper surface of precision grinder workbench, rotation profiling emery wheel makes profiling emery wheel rotation and surface of the work to be ground belong to the plane in angle of 45 degrees, makes first minimum point of profiling emery wheel become the grinding center point;

Step 2, the profiling emery wheel is adjusted to article one arc groove initial point to be processed; Make workpiece to be ground with the precision grinder workbench along the feeding in the other direction of X axle; Control profiling emery wheel direction of rotation is rotated counterclockwise; After processing article one arc groove to be processed, then the profiling emery wheel, Y direction is moved back into article one arc groove initial point to be processed place after mentioning, again the profiling emery wheel is moved to the second adjacent groove initial point to be processed place in the other direction along the Z axle; Make workpiece to be ground with the precision grinder workbench along the feeding in the other direction of X axle; Control profiling emery wheel direction of rotation is rotated counterclockwise, and machines second groove to be processed, in like manner processes next bar arc groove to be processed successively;

Step 3, when being that the grinding workspace at center is because wearing and tearing when need repairing with first minimum point on the profiling emery wheel; Rotate the profiling emery wheel once more; Make the emery wheel rotation become 135 degree angles with plane, surface of the work to be ground place; First minimum point of profiling emery wheel is become with first minimum point-symmetric second minimum point becomes the grinding center point, then according to the said processing arc groove of step 2, treats on the profiling emery wheel with second minimum point to be that the grinding workspace at center is when also needing finishing because of wearing and tearing; The profiling emery wheel is repaired, the copying abrasion wheel dressing continued is carried out grinding until the intact whole arc groove arrays of grinding according to step 1～step 3 again.

The present invention has following beneficial effect: the folk prescription synclinal axis profiling precise grinding process of arc groove array optical element of the present invention has adopted folk prescription to method for grinding; Compare with the method for grinding that existing little arc groove array optical component mold changes reciprocation type; Guaranteed that each bar arc groove all is that emery wheel is forming along grinding under the situation of abrasive grain cutting direction feeding; Surface roughness has reduced by 10%～15%, has improved machining accuracy greatly;

The emery wheel rotating shaft of precise grinding process of the present invention and workpiece to be processed surface keep 45 degree angles; Emery wheel is that grinding is carried out to arc groove in the center with the B point; Be that the center continues arc groove is carried out grinding with the C point behind the abrasion of grinding wheel, treat to repair again after emery wheel B point and C point all wear and tear, once repair twice grinding; Thereby reduced the finishing number of times in little arc groove array optical component mold accurate grinding process, grinding efficient is doubled.

Description of drawings

Fig. 1 is the principle schematic of the folk prescription synclinal axis profiling precise grinding process of little arc groove array optical element of the present invention, and Fig. 2 is the principle schematic of existing little arc groove array optical element method for grinding.

The specific embodiment

The specific embodiment one: combine Fig. 1 explanation, the folk prescription synclinal axis profiling precise grinding process of the described little arc groove array optical element of this embodiment is realized according to following steps:

Step 1, workpiece 4 to be ground is fixed on the upper surface of precision grinder workbench 5; Rotation profiling emery wheel 3 makes profiling emery wheel 3 rotations 1 and workpiece to be ground 4 surfaces belong to the plane in angle of 45 degrees, makes the first minimum point B of profiling emery wheel 3 become the grinding center point;

Step 2, profiling emery wheel 3 is adjusted to article one arc groove initial point to be processed; Make workpiece 4 to be ground with precision grinder workbench 5 along the feeding in the other direction of X axle; Control profiling emery wheel 3 direction of rotation are rotated counterclockwise; After processing article one arc groove to be processed, then profiling emery wheel 3, Y direction is moved back into article one arc groove initial point to be processed place after mentioning, again profiling emery wheel 3 is moved to the second adjacent groove initial point to be processed place in the other direction along the Z axle; Make workpiece 4 to be ground with precision grinder workbench 5 along the feeding in the other direction of X axle; Control profiling emery wheel 3 direction of rotation are rotated counterclockwise, and machine second groove to be processed, in like manner process next bar arc groove to be processed successively;

Step 3, when being that the grinding workspace at center is because wearing and tearing when need repairing with the first minimum point B on the profiling emery wheel 3; Rotate profiling emery wheel 3 once more; Make emery wheel rotation 1 become 135 degree angles with plane, place, workpiece to be ground 4 surface; The second minimum point C that the first minimum point B of profiling emery wheel 3 is become with first minimum point B symmetry becomes the grinding center point; Then according to the said processing arc groove of step 2; Treat on the profiling emery wheel 3 that with the second minimum point C be the grinding workspace at center when also needing finishing because of wearing and tearing, again profiling emery wheel 3 repaired that profiling emery wheel 3 finishing continued are carried out grinding until the intact whole arc groove arrays of grinding according to step 1～step 3.

The arc radius of little arc groove array according to the invention is 0.1mm～1.5mm, and groove depth is not more than ((2 ^0.5-1) R/2);

The grinding tool that the present invention selects for use is resin-bonded or the metal-bonded diamond 14F1 or the 1FF1 type profiling emery wheel of 400#～2000# granularity;

Little arc groove array optical component mold material according to the invention comprises: accurate silicon carbide ceramics, accurate silicon nitride ceramics and Talide etc.

Operation principle:

Because the hard fragility of little arc groove array optical component mold material; The micro-crack that causes in the grinding process can be grown with the abrasive grain cutting direction; Emery wheel is during along abrasive grain cutting feeding grinding in the other direction, and micro-crack can be introduced machined surface, thereby causes surface roughness to increase; Little arc groove array surface quality of different direction of feed grindings is inequality; Adopt folk prescription to method for grinding, avoided the destruction of micro-crack to machined surface, every arc groove all processes under identical grinding situation in the array; Eliminated little arc groove array surface quality heterogeneity phenomenon, adjacent two the arc groove average surface roughness basic identical (deviation is less than 10%) after the grinding;

The present invention adopts the profiling precise grinding process, in the grinding process, with the feeding of emery wheel; The abrasive grain cutting track of emery wheel axial distribution can be interfered stack each other, and the height that reduces the little sword of abrasive grain cutting on the emery wheel rises and falls to the influence of arc groove grinding pattern, observes through testing back SEM; The grinding vestige obviously weakens; Compare with existing processing method, surface roughness has reduced by 10%～15%, has improved machining accuracy; Simultaneously; Emery wheel is that grinding is carried out to arc groove in the center with B point (C point); Can continue arc groove is carried out grinding for the center by C point (B point) behind the abrasion of grinding wheel, treat repairing after emery wheel B point and C point all wear and tear, once repair twice grinding; Thereby reduced the finishing number of times in little arc groove array optical component mold accurate grinding process, working (machining) efficiency is doubled;

Know by above; The present invention is a kind of folk prescription synclinal axis profiling precise grinding process to little arc groove array optical component mold; Can eliminate little arc groove array surface quality phenomenon inequality; Effectively reduce face surface roughness after the grinding, improve the grinding vestige, reduce the crushing number of times, obtain good crudy and high working (machining) efficiency.

Claims

1. the folk prescription synclinal axis profiling precise grinding process of a little arc groove array optical element, it is characterized in that: the folk prescription synclinal axis profiling precise grinding process of said little arc groove array optical element is realized according to following steps:

Step 1, workpiece to be ground (4) is fixed on the upper surface of precision grinder workbench (5); Rotation profiling emery wheel (3) makes profiling emery wheel (3) rotation (1) and workpiece to be ground (4) surface belong to the plane in angle of 45 degrees, makes first minimum point (B) of profiling emery wheel (3) become the grinding center point;

Step 2, profiling emery wheel (3) is adjusted to article one arc groove initial point to be processed; Make workpiece to be ground (4) with precision grinder workbench (5) along the feeding in the other direction of X axle; Control profiling emery wheel (3) direction of rotation is rotated counterclockwise; After processing article one arc groove to be processed, then profiling emery wheel (3), Y direction is moved back into article one arc groove initial point to be processed place after mentioning, again profiling emery wheel (3) is moved to the second adjacent groove initial point to be processed place in the other direction along the Z axle; Make workpiece to be ground (4) with precision grinder workbench (5) along the feeding in the other direction of X axle; Control profiling emery wheel (3) direction of rotation is rotated counterclockwise, and machines second groove to be processed, in like manner processes next bar arc groove to be processed successively;

Step 3, when being that the grinding workspace at center is because wearing and tearing when need repairing with first minimum point (B) on the profiling emery wheel (3); Rotate profiling emery wheel (3) once more; Make emery wheel rotation (1) become 135 degree angles with plane, place, workpiece to be ground (4) surface; Second minimum point (C) that first minimum point (B) of profiling emery wheel (3) is become with first minimum point (B) symmetry becomes the grinding center point; Then according to the said processing arc groove of step 2; Treat that it be the grinding workspace at center when also needing finishing because of wearing and tearing that profiling emery wheel (3) is gone up with second minimum point (C), again profiling emery wheel (3) repaired that profiling emery wheel (3) is repaired continued and carried out grinding according to step 1～step 3 and finish whole arc groove arrays until grinding.