CN112091778A

CN112091778A - Single-point grinding process for bullet type aspheric surface die

Info

Publication number: CN112091778A
Application number: CN202010929995.5A
Authority: CN
Inventors: 姜绪木; 李振; 张博伦; 谢飞
Original assignee: Mdtp Optics Co ltd
Current assignee: Mdtp Optics Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2020-12-18

Abstract

The invention discloses a single-point grinding processing technique of a bullet type aspheric surface mould, which utilizes an ultra-precise 5-axis grinding machine and a unique single-point grinding wheel finishing mode, the front end circular arc of the disc grinding wheel can be trimmed to R0.15mm, the cutting profile precision is below 1 micron, software is generated by matching with a processing program path, the flexibility of the grinding machine with 5 shafts realizes the three-shaft linkage machining of the XZB, the generation of a program path can realize the constant feeding speed at the aspheric surface, the B axis at the arc position is stably and safely rotationally processed from 60 degrees to 0 degrees, the measurement and correction of the die surface type are carried out by using UA3P, the final surface type precision of the die reaches below PV0.15 microns, the processing difficulty is solved, the management and control of the die surface type precision and the machining safety are effectively improved, and by using the processing technology, the processing precision management and control of the bullet type die have obvious effect, so that the die can be used in the die pressing operation in a large scale.

Description

Single-point grinding process for bullet type aspheric surface die

Technical Field

The invention relates to the field of mold processing, in particular to a bullet type non-spherical mold single-point grinding processing technology.

Background

At present, the shapes of aspheric lenses in the market are more and more diversified, the imaging requirements are higher and higher, and the precision of the lenses is also more strictly controlled; the processing of the die with the height loss, the die edge angle larger than 60 degrees and the aspheric surface and the plane with the excessive round angle smaller than 0.2mm also has new challenges, so a new method is provided for the processing technology of the special die.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a bullet type single-point grinding processing technology for an aspheric surface die.

The technical scheme adopted by the invention is as follows: a single-point grinding process for a bullet type aspheric surface mould comprises the following steps;

s1, selecting an ultra-precise 5-axis grinding machine, mounting the resin bond grinding wheel on a grinding shaft, and adjusting the center of a grinding edge of the grinding wheel to the rotation center of the B axis;

s2, placing the grinding wheel in the radial direction of a grinder dresser, and dressing the grinding wheel to a proper angle and size by means of B-axis rotation and X-axis movement;

s3, adsorbing the die to a main shaft of a grinding machine, and adjusting the central axis of the die to be coaxial with the main shaft;

s4, adjusting the grinding shaft to a proper angle, contacting the grinding shaft with the center point of the mold, retreating to a safe distance, and determining a processing coordinate point;

s5, running a program, wherein the rotating angle of the B axis is used for accurately controlling the processing surface type, so that the surface type of the die is smoother and more stable;

and S6, repeatedly measuring the PV to enable the final surface shape precision of the die to be less than PV0.15 micron.

Preferably, in step S5, B axis is smoothly and safely rotationally machined from 60-0 degrees at the arc of the die, and the measurement of the die surface model is corrected by using a UA3P measuring instrument.

Preferably, step S5 is executed by a program path generating software to generate a constant feed speed at the aspherical surface.

Preferably, the grinding wheel is a disc grinding wheel, the arc of the front end of the disc grinding wheel is trimmed to R0.15mm, and the cutting profile precision is controlled to be less than 1 micron.

The invention utilizes an ultra-precise 5-axis grinding machine and a unique single-point grinding wheel dressing mode to dress the front end circular arc of the disc grinding wheel to R0.15mm, the cutting outline precision is below 1 micron, the invention is matched with processing program path generation software to realize the three-axis linkage processing of the XZB with the flexibility of the 5-axis grinding machine, the constant feeding speed at the aspheric surface part can be realized by generating the program path, the B axis is stably and safely rotated and processed from 60 degrees to 0 degrees at the circular arc part, the final surface precision of the die reaches below PV0.15 micron by utilizing the measurement and correction of the surface shape of the die by UA3P, the processing difficulty is solved, the management and control of the surface precision of the die are effectively improved, the machining safety is improved, the processing technology has obvious effect on the management and control of the processing precision of the die with the bullet head type, and the die can be used in the die.

Drawings

FIG. 1 is a schematic view of a dressing wheel of the present invention;

FIG. 2 is a schematic view of the inventive die process.

In the figure: 1. a finisher; 2. a grinding wheel; 3. a Z axis; 4. grinding the shaft; 5. a B axis; 6. a work table; 7. a dresser auxiliary shaft; 8. an X axis; 9. a main shaft; 10. and (5) molding.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it is to be understood that the terms "mounted," "connected," and "connected" are used broadly and can be, for example, mechanically or electrically connected, or can be internal to two elements, directly connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms can be understood by those of ordinary skill in the art as appropriate.

As shown in fig. 1 and 2, a bullet type aspherical mold single-point grinding process includes the following steps:

Preferably, step S5 is performed by matching a machining program path generating software to generate a constant feed speed at the aspherical surface, and specifically, matlab design can be used.

The invention utilizes an ultra-precise 5-axis grinding machine and a unique single-point grinding wheel finishing mode to finish the front end circular arc of a disc grinding wheel to R0.15mm, the cutting outline precision is below 1 micron, the invention is matched with processing program path generation software to realize the three-axis linkage processing of the XZB with the flexibility of the 5-axis grinding machine, the program path generation can realize the constant feeding speed at the aspheric surface, the B axis is stably and safely rotated and processed from 60 degrees to 0 degrees at the circular arc, the measurement and correction of the die surface type are utilized by UA3P to ensure that the final surface type precision of the die reaches below PV0.15 micron, the processing difficulty is solved, the management and control of the die surface type precision are effectively improved, the machining safety is improved, the processing process technology has obvious effect on the management and control of the die surface type of a bullet head die, so that the die can be used in large-scale in the die pressing operation and the high-efficiency processing of glass dies used for lenses in the application fields of projection imaging, 3, single-point processing can be realized, and face shape control is optimal.

In the description herein, references to the description of "one embodiment," "an example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A single-point grinding processing technology for a bullet type aspheric surface die is characterized by comprising the following steps:

2. The method of claim 1, wherein the B-axis is smoothly and safely rotationally machined from 60 ° to 0 ° at the arc of the mold in step S5, and the measurement of the mold profile is corrected using UA3P gauge.

3. The method of claim 2, wherein step S5 is coordinated with machining program path generation software, the program path generating a constant feed speed at the aspherical surface.

4. The method of claim 1, wherein the grinding wheel is a disc grinding wheel, the front end arc of the disc grinding wheel is trimmed to R0.15mm, and the cutting profile precision is controlled to be less than 1 micron.