CN113198697B - Fixture and method for positioning workpiece and processing method of optical element - Google Patents
Fixture and method for positioning workpiece and processing method of optical element Download PDFInfo
- Publication number
- CN113198697B CN113198697B CN202110597180.6A CN202110597180A CN113198697B CN 113198697 B CN113198697 B CN 113198697B CN 202110597180 A CN202110597180 A CN 202110597180A CN 113198697 B CN113198697 B CN 113198697B
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 title abstract description 23
- 238000003672 processing method Methods 0.000 title abstract description 4
- 238000004026 adhesive bonding Methods 0.000 claims abstract description 87
- 239000004831 Hot glue Substances 0.000 claims abstract description 55
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 239000003292 glue Substances 0.000 claims abstract description 25
- 239000012943 hotmelt Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000012790 adhesive layer Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 17
- 239000011521 glass Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C13/00—Means for manipulating or holding work, e.g. for separate articles
- B05C13/02—Means for manipulating or holding work, e.g. for separate articles for particular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
- B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
Abstract
The invention belongs to the technical field of optics, and discloses a clamp and a method for positioning a workpiece and a processing method of an optical element, wherein the clamp for positioning the workpiece comprises the following components: the gluing device comprises a gluing area, an isolation area and a reference positioning area, wherein the gluing area and the reference positioning area are separated by the isolation area, a reference plane for positioning is arranged on the reference positioning area, and a groove for containing hot melt adhesive is arranged in the gluing area; the isolation area is provided with an isolation groove for accommodating the hot melt adhesive overflowing from the gluing area; the cooperation mode of the to-be-glued plane arranged on the workpiece and the reference plane on the reference positioning area is surface contact, and the gluing area and the workpiece are provided with to-be-glued planes which are glued through hot melt glue. The reference plane is tightly attached to the plane to be glued of the workpiece, so that clamping unequal thickness errors caused by uneven thickness of an adhesive layer during gluing are prevented, and the isolation region prevents the hot melt adhesive from polluting a reference positioning region; because the adhesive layer is thick, the time required by curing is long, and the deformation of the clamp is effectively prevented from being transmitted to the workpiece.
Description
Technical Field
The invention belongs to the technical field of optics, and relates to a workpiece positioning clamp and a positioning method.
Background
The most widely used optical processing materials are glass materials, and the materials have the characteristics of brittleness and easy breakage. When the glass material is machined, the glass is easy to break by adopting a three-jaw and self-centering chuck mechanical hard clamping mode, and the internal stress deformation of the glass material is easy to cause during clamping.
The glass clamping device is characterized in that parallel metal plates are widely adopted for protection in the prior art aiming at the problem that glass materials are brittle and easy to break, glass is glued on the parallel metal plates, and the metal plates at the bottom are clamped in the clamping process, so that the workpiece is clamped. And during clamping, the deformation of the metal plate is transmitted to the glass workpiece due to the clamping force.
The traditional gluing mode is that hot melt adhesive is coated between a reference surface and a workpiece, and after the workpiece is glued, the reference surface recovers deformation after being cooled, so that stress deformation can be brought to the inside of the workpiece; the step of coating glue on the datum plane is actually to cover the datum plane by a molten glue layer, and when a workpiece is placed on the datum plane for positioning, the datum plane cannot be in direct contact with the workpiece, but a layer of hot melt glue layer is filled; the glue layer is difficult to be very uniform, even if the micrometer-scale nonuniformity exists, the positioning reference of the workpiece is changed, the hot melt adhesive is cooled quickly in the gluing process, and the thicker glue layer becomes more viscous in the cooling process, so that the thinner glue layer in the prior art is more favorable for improving the uniformity of the glue layer. The thin glue layer is easy to improve the uniformity of the glue layer, and is more beneficial to enabling the reference surface of the workpiece to be parallel to the parallel metal plate, but the cost is the sacrifice of partial gluing force.
Disclosure of Invention
The technical problem to be solved is that: the non-uniform thickness of the glue layer can cause the workpiece reference surface to be not perpendicular to the processing spindle; the clamping force causes the inside of the workpiece to generate stress and deform.
A jig for positioning a workpiece on which a plane to be glued is provided, comprising: the gluing device comprises a gluing area, an isolation area and a reference positioning area, wherein the gluing area and the reference positioning area are separated by the isolation area, a reference plane for positioning is arranged on the reference positioning area, and a groove for containing hot melt adhesive is arranged in the gluing area; the isolation area is provided with an isolation groove for accommodating the hot melt adhesive overflowing from the gluing area; the cooperation mode of the to-be-glued plane arranged on the workpiece and the reference plane on the reference positioning area is surface contact, and the gluing area and the workpiece are provided with to-be-glued planes which are glued through hot melt glue. Preferably, the horizontal plane of the gluing area is at least 0.5mm higher than that of the isolation area, and the reference plane of the reference positioning area is 0.3-0.4 mm higher than that of the gluing area.
When the fixture for positioning the workpiece is used, S1, the fixture is installed and fixed on a machine tool workbench, a datum plane of a datum positioning area is leveled by a knife process, and the leveled datum plane is perpendicular to a main shaft of a machine tool; s2, heating a clamp for positioning the workpiece, coating the heated and melted hot melt adhesive in a groove of the gluing area, placing the heated workpiece to be positioned on the clamp for positioning the workpiece, and applying pressure to the workpiece to be positioned so that a reference plane arranged on the reference positioning area is in contact with a plane to be glued on the workpiece to be positioned; the hot melt adhesive melted in the gluing area is adhered to a workpiece to be positioned, and the hot melt adhesive with excessive waste heat flows into an isolation groove of an isolation area during positioning, and after cooling, the workpiece can be clamped; s3, heating the gluing area after the machining, only taking down the workpiece, and still fixing the clamp on the machine tool workbench; and if repeated positioning is needed, the workpiece can be clamped by repeating the step S2.
Because the hot melt adhesive is only coated on the gluing area in the clamping process, the reference plane of the reference positioning area can be tightly attached to the to-be-glued plane of the to-be-positioned workpiece, the clamping unequal thickness error caused by uneven thickness of the adhesive layer in gluing can be effectively prevented, and due to the arrangement of the isolation area, the hot melt adhesive can be effectively prevented from polluting the reference plane of the reference positioning area in the clamping process. The plane to be glued of the workpiece clamped by the technical scheme is perpendicular to the main shaft of the machine tool, so that the positioning precision of the workpiece in the Z direction (the direction of the main shaft) is greatly improved. In addition, the temperature of the clamp rises during clamping, so that the reference plane generates micro expansion along the Z direction, and because the reference plane of the reference positioning area of the clamp is higher than the horizontal plane of the gluing area, the deformation of the reference positioning area in the Z direction is larger than that of the gluing area after the clamp is heated; the datum plane is contacted with the workpiece during gluing, after cooling, the datum plane contracts and recovers the initial form, and the datum plane is separated from the workpiece; the glue layer between the gluing area and the workpiece is slowly solidified in the gradual cooling process, and because the glue layer is thick, the time required by solidification is long, so that the deformation of the clamp is effectively prevented from being transmitted to the workpiece. The glue layer uniformity is difficult to control after the glue layer is glued more in the traditional gluing mode, the technical scheme has the reference plane positioning through the reference positioning area, the problem that the reference plane of a workpiece and a processing spindle are not perpendicular due to the fact that the glue layer is not uniform is solved by increasing the thickness of the glue layer of the gluing area, and the problem that the workpiece is deformed due to the fact that a hot melting gluing mode fixture is heated and deformed to cause stress deformation of the workpiece is also solved. The workpiece can be clamped by repeating the step S2 when the workpiece needs to be repeatedly clamped, the resetting precision of the Z axis is high because the positioning reference surfaces are all the reference planes of the reference positioning area when the workpiece needs to be repeatedly clamped, the Z coordinate of the reference plane can be used as a reference zero point under the condition that the thickness of the workpiece needs to be accurately controlled, and the center thickness of the workpiece can be obtained by measuring the Z coordinate of the end surface center of the workpiece and the coordinate difference between the Z coordinate of the reference plane and the Z coordinate of the reference plane. The clamp of this scheme is fixed clamping earlier on the lathe revolving stage when using, and the fixed work piece of veneer in the anchor clamps after the deformation district to processing is accomplished the back anchor clamps and is still fixed on the lathe revolving stage, therefore the clamping power of anchor clamps can not transmit the work piece.
The reset positioning precision in the X direction and the Y direction is further improved in the clamping process through the matching mode of the positioning outer cone and the auxiliary positioning block. The mode can effectively reduce the eccentric difference caused by the eccentricity and the inclination of the optical axis of the workpiece for the optical elements of the rotationally symmetrical workpiece.
Drawings
FIG. 1 is a schematic top view of an example fixture 1 for positioning a workpiece;
FIG. 2 is a schematic cross-sectional view of an example fixture 1 for positioning a workpiece;
FIG. 3 is a schematic cross-sectional view of a fixture configured with a heating circuit for positioning a workpiece;
FIG. 4 is a schematic top view of a fixture configured with gas vents for positioning a workpiece;
FIG. 5 is a schematic cross-sectional view of a fixture for workpiece positioning equipped with a hot melt adhesive container glued to a workpiece to be positioned;
FIG. 6 is a schematic top view of an example fixture 2 for positioning a workpiece;
FIG. 7 is a schematic cross-sectional view of an example 2 of a jig for positioning a workpiece gluing the workpiece to be positioned;
FIG. 8 is a schematic cross-sectional view of a fixture configured with an inner cone locating surface for locating a workpiece;
FIG. 9 is a cross-sectional view of an auxiliary positioning block;
FIG. 10 is a schematic view of the assembly of the inner cone positioning surface with the auxiliary positioning block;
FIG. 11 is a schematic view of a bonded body of a workpiece and a positioning outer cone;
in the figure: 1. the device comprises an inner gluing area, an inner separation groove, a reference positioning ring, an outer separation groove, an outer gluing area, a heating circuit, a gas guide hole, a hot melt adhesive, a workpiece to be positioned, an outer positioning cone, a positioning flange face 11, an inner cone positioning face 12, an auxiliary positioning block 13, an auxiliary positioning block 14, a locking device 15, a hot melt adhesive container 16 and a hot melt adhesive conduit 5.
Detailed Description
Example one
As shown in fig. 1 and 2, a workpiece 9 to be positioned is provided with a plane to be glued, which is a reference plane of the workpiece to be positioned; the jig for positioning a workpiece includes: the hot melt adhesive device comprises a gluing area, an isolation area and a reference positioning area, wherein the gluing area and the reference positioning area are separated by the isolation area, a reference plane for positioning is arranged on the reference positioning area, and a groove for containing hot melt adhesive is arranged in the gluing area; the isolation area is provided with an isolation groove for accommodating the hot melt adhesive overflowing from the gluing area; the matching mode of the plane to be glued arranged on the workpiece and the reference plane on the reference positioning area is surface contact, and the gluing area and the plane to be glued arranged on the workpiece are glued and connected through hot melt glue 8; the gluing area is an inner gluing area 1, the isolation area is an inner isolation groove 2, and the reference positioning area is a reference positioning ring 3; the end face of the reference positioning ring is an annular reference plane, the inner gluing area is arranged in the annular reference plane, and the inner gluing area is inwards sunken to form a groove for containing hot melt adhesive; the inner isolation groove is arranged between the reference positioning ring and the inner gluing area and is inwards sunken to form an annular groove.
The optimization scheme based on the scheme is as follows: a heating circuit is configured in the fixture, as shown in fig. 3, which is a schematic view of a cross section of the fixture for positioning a workpiece, after the heating circuit 6 is powered on, a proper amount of solid hot melt adhesive particles are placed in the gluing area, the workpiece to be glued is pressed on the reference positioning area after the solid hot melt adhesive particles are fully melted, the hot melt adhesive is glued with the bottom of the workpiece, and redundant glue flows into the inner isolation groove, so that the hot melt adhesive is prevented from polluting the reference positioning area. And (4) disconnecting the heating circuit, and gluing the workpiece on the clamp after cooling. The mode effectively improves the clamping efficiency, the hot melt adhesive can be melted in several seconds after the heating circuit is electrified, and the workpiece can be fixed on the clamp after being glued and cooled. The reference positioning area of the clamp is perpendicular to the main shaft of the machine tool, and the bottom of the workpiece and the reference positioning area are not provided with the hot melt adhesive layer, so that the problem of inclination of the positioning surface of the workpiece caused by uneven thickness of the adhesive layer is effectively solved, and higher positioning precision can be obtained when the upper end surface of the workpiece is machined. For example, when the parallelism of the upper end surface and the lower end surface of a workpiece is processed, one end surface is glued randomly by using the clamp, the other end surface plane is processed, after the other end surface plane is processed, the processed end surface plane is pressed in the reference positioning area, and after the hot melt adhesive is glued and fixed, the other end surface is processed, so that the errors of the parallelism and the verticality can be effectively reduced.
One optimization scheme is as shown in fig. 4, and the fixture for positioning the workpiece is further provided with an air guide hole 7, wherein the air guide hole is used for balancing air pressure of the isolation area and the environment, one end of the air guide hole is arranged in the isolation area, and the other end of the air guide hole is connected with the outside air. Without such air vents, closed spaces may be formed in the insulation groove during gluing, which is not conducive to the flow of the hot melt adhesive. When a workpiece is glued, the air in a heated isolation area is thin, the air pressure in the isolation area can be lower than the air pressure of the external environment easily after the temperature is reduced, the workpiece is easy to deform in the workpiece when a high-precision workpiece is machined, for example, when an optical aspheric surface or a spherical surface is machined, the negative pressure easily generates stress in the workpiece, and after the machining is finished, the stress of the workpiece taken down from a clamp is recovered to cause the machined surface shape to exceed the tolerance. The negative pressure problem in the isolation area can be effectively solved by arranging the air guide hole.
In another preferred embodiment, as shown in fig. 5, a hot melt adhesive container 15 and a hot melt adhesive conduit 16 are provided, one end of the hot melt adhesive conduit being in communication with the hot melt adhesive container and the other end being in communication with the gluing zone. The hot melt adhesive container is arranged, after the heating circuit is electrified, hot melt adhesive in the hot melt adhesive container is melted and flows into the gluing area through the hot melt adhesive guide pipe, after the heating circuit is electrified after the processing is finished, the hot melt adhesive in the gluing area is melted, and the hot melt adhesive can be recovered to the hot melt adhesive container through the hot melt adhesive guide pipe. The hot melt adhesive container may be configured as a metal syringe.
Example two
In an embodiment, a fixture for positioning a workpiece is further provided, as shown in fig. 6, with an outer isolation groove 4, an outer gluing area 5; the outer gluing area is arranged outside the annular reference plane and is inwards sunken to form a groove for containing hot melt adhesive; the outer isolation groove is arranged between the reference positioning ring and the outer gluing area and is inwards sunken to form an annular groove.
When the clamp is used, as shown in fig. 7, for a workpiece with a smaller caliber, an inner gluing area can be used for completing gluing; but for large-caliber workpieces, the gluing can be completed by using the outer gluing area; for a large-caliber workpiece needing large gluing force, the inner gluing area and the outer gluing area can jointly finish gluing and fixing.
Embodiments one and two are based on a fixture for positioning a workpiece, which can be used in a machine tool table or other equipment requiring precise horizontal (or vertical) positioning. The workbench of the traditional machine tool is mostly provided with a multi-specification T-shaped groove or threaded hole or a self-centering chuck structure, positioning is realized by a pressing plate or a workpiece clamping mode, and a higher positioning posture can be obtained by directly contacting a reference positioning area of the technical scheme with a reference surface of the workpiece for gluing; the stress of the workpiece can be effectively reduced by clamping in a mode of only coating hot melt adhesive on the gluing area.
EXAMPLE III
A clamp for positioning a workpiece is further provided with a positioning outer cone 10, a positioning flange surface 11, an auxiliary positioning block 13, an inner cone positioning surface 12 and a locking device 14, as shown in FIGS. 8 and 9; the positioning outer cone is arranged at the bottom of the clamp for positioning the workpiece, and the central axis of the positioning outer cone is perpendicular to the reference plane of the reference positioning area; the positioning flange surface is positioned at the bottom of the clamp for positioning the workpiece, and is vertical to the central axis of the positioning outer cone; an inner cone positioning surface matched with the positioning outer cone is arranged on the auxiliary positioning block, and the end surface of the auxiliary positioning block is vertical to the central axis of the inner cone positioning surface; after the positioning outer cone is matched with the auxiliary positioning block, as shown in fig. 10, the inner cone positioning surface is tangent to the positioning outer cone, and the positioning flange surface is tangent to the end surface of the auxiliary positioning block; and the locking device is arranged on the auxiliary positioning block and used for locking and positioning the outer cone and the auxiliary positioning block.
The use steps of the clamp during positioning are as follows: s1, installing the clamp for positioning the workpiece on a machine tool workbench, and locking a positioning outer cone and an auxiliary positioning block by a locking device after the positioning outer cone is matched with the auxiliary positioning block; leveling the datum plane of the datum positioning area by using a smooth cutter process, wherein the leveled datum plane is vertical to a main shaft of the machine tool; s2, coating the heated and melted hot melt adhesive in a groove of the gluing area, placing the heated workpiece to be positioned on a clamp for positioning the workpiece, and applying pressure to the workpiece to be positioned so that a reference plane arranged on the reference positioning area is in contact with a plane to be glued on the workpiece to be positioned in a fitting manner; the hot melt adhesive melted in the gluing area is adhered to the workpiece to be positioned, redundant hot melt adhesive flows into the isolation groove of the isolation area, and after cooling, a plane to be glued arranged on the workpiece to be positioned is fixedly connected with the gluing area through the hot melt adhesive; s3, after the machining is finished, unlocking the positioning outer cone and the auxiliary positioning block by loosening the locking device, and taking down the workpiece and the positioning outer cone glue body shown in the figure 11; if repeated positioning is needed, after the workpiece and the positioning outer cone gluing body are matched with the auxiliary positioning block, the locking device locks the positioning outer cone and the auxiliary positioning block, and then the workpiece can be reset and clamped. The positioning outer cone 10, the positioning flange face 11, the auxiliary positioning block 13 and the inner cone positioning face 12 are matched with each other, so that high-precision repeated positioning precision can be realized, the positioning coordinate of the Z axis can be restored, the coordinate of the X, Y axis can be restored, and self-centering during restoration is realized.
For example, the method of processing an optical element using this jig is as follows:
according to the processing method of the optical element of the using mode of the clamp, the first end face of the optical element is a reference plane, the second end face of the optical element is one of a plane, a convex face and a concave face, any one end face of an optical element blank is firstly clamped in the reference positioning area of the clamp for positioning the workpiece, the other end face of the optical element is milled and processed into a plane after clamping, and the optical element is taken down from the heating gluing area; after the plane surface shape meets the requirement, the processed plane is taken as a reference plane of the optical element to be glued with the gluing area, and after the second end face is processed, the appearance of the optical element is processed by using an edging process; after the shape is processed, taking down the optical element and the positioning outer cone glue body, measuring the second end surface shape of the optical element, and heating the optical element and the positioning outer cone glue body to take down the workpiece if the surface shapes meet the requirements to obtain an optical element mirror body; and if the error of the second end surface is detected to exceed the tolerance, the optical element and the positioning outer cone glue body are assembled on the auxiliary positioning block again for compensation processing until the detected surface shape meets the requirement, and the optical element is taken down. The processing mode can effectively solve the eccentric error caused by the fact that the reference surface of the workpiece is not horizontal, and can also effectively solve the eccentric error that the optical axis of the workpiece deviates from the geometric center. The center thickness of the workpiece can be accurately controlled by taking the datum plane as a reference zero point.
Claims (1)
1. A machine tool table, comprising: the fixture is used for positioning a workpiece, the positioning outer cone, the positioning flange surface, the auxiliary positioning block, the inner cone positioning surface and the locking device;
wherein: the fixture for positioning the workpiece consists of a gluing area, an isolation area, a reference positioning area and a heating circuit;
the gluing area and the reference positioning area are separated by the isolation area, a reference plane for positioning is arranged on the reference positioning area, and the gluing area is provided with a groove for containing hot melt adhesive;
the horizontal plane of the gluing area is at least 0.5mm higher than the horizontal plane of the isolation area, and the reference plane of the reference positioning area is 0.3-0.4 mm higher than the horizontal plane of the gluing area;
the isolation area is provided with an isolation groove for accommodating the hot melt adhesive overflowing from the gluing area; the matching mode of the plane to be glued arranged on the workpiece and the reference plane on the reference positioning area is surface contact, the gluing area and the plane to be glued arranged on the workpiece are glued and connected through hot melt glue, and the heating circuit is used for heating the gluing area;
the gluing area is as follows: an inner gluing area and an outer gluing area; the isolation region is as follows: an inner isolation groove and an outer isolation groove; the reference positioning area is a reference positioning ring; the end face of the reference positioning ring is an annular reference plane, the inner gluing area is arranged in the annular reference plane, and the inner gluing area is inwards sunken to form a groove for containing hot melt adhesive; the inner isolation groove is arranged between the reference positioning ring and the inner gluing area;
the outer gluing area is arranged outside the annular reference plane and is inwards sunken to form a groove for containing hot melt adhesive; the outer isolation groove is arranged between the reference positioning ring and the outer bonding area, and the inner isolation groove and the outer isolation groove are both inwards recessed to form an annular groove;
the positioning outer cone is arranged at the bottom of the clamp for positioning the workpiece, and the central axis of the positioning outer cone is perpendicular to the reference plane of the reference positioning area; the positioning flange surface is positioned at the bottom of the clamp for positioning the workpiece, and is vertical to the central axis of the positioning outer cone; an inner cone positioning surface matched with the positioning outer cone is arranged on the auxiliary positioning block, and the end surface of the auxiliary positioning block is vertical to the central axis of the inner cone positioning surface; after the positioning outer cone is matched with the auxiliary positioning block, the inner cone positioning surface is tangent to the positioning outer cone, and the positioning flange surface is tangent to the end surface of the auxiliary positioning block; the locking device is arranged on the auxiliary positioning block and used for locking and positioning the outer cone and the auxiliary positioning block;
when in use: after the positioning outer cone is matched with the auxiliary positioning block, the locking device locks the positioning outer cone and the auxiliary positioning block; leveling the datum plane of the datum positioning area by using a smooth cutter process, wherein the leveled datum plane is vertical to a main shaft of the machine tool;
coating the heated and melted hot melt adhesive in the groove of the gluing area, placing the heated workpiece to be positioned on a fixture for positioning the workpiece, and applying pressure to the workpiece to be positioned so that a reference plane arranged on the reference positioning area is in contact with a plane to be glued on the workpiece to be positioned in a fitting manner; the hot melt adhesive melted in the gluing area is adhered to the workpiece to be positioned, redundant hot melt adhesive flows into the isolation groove of the isolation area, and after cooling, a plane to be glued arranged on the workpiece to be positioned is fixedly connected with the gluing area through the hot melt adhesive;
after the machining is finished, the locking device is loosened to unlock the positioning outer cone and the auxiliary positioning block, and the workpiece and the positioning outer cone are glued; if repeated positioning is needed, after the workpiece and the positioning outer cone gluing body are matched with the auxiliary positioning block, the locking device locks the positioning outer cone and the auxiliary positioning block, and then the workpiece can be reset and clamped.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110597180.6A CN113198697B (en) | 2021-05-31 | 2021-05-31 | Fixture and method for positioning workpiece and processing method of optical element |
| PCT/CN2021/101185 WO2022252303A1 (en) | 2021-05-31 | 2021-06-21 | Fixture and method for workpiece positioning and machining method for optical element |
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| CN202110597180.6A CN113198697B (en) | 2021-05-31 | 2021-05-31 | Fixture and method for positioning workpiece and processing method of optical element |
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| CN113198697A CN113198697A (en) | 2021-08-03 |
| CN113198697B true CN113198697B (en) | 2022-07-26 |
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| CN114799291A (en) * | 2022-03-30 | 2022-07-29 | 北京航天时代激光导航技术有限责任公司 | Multi-working-condition metal tool for milling deep groove of laser gyroscope groove piece and technological method |
| CN116680961B (en) * | 2023-07-28 | 2023-12-29 | 中科航迈数控软件(深圳)有限公司 | Measurement compensation method, device, equipment and storage medium considering clamping force deformation |
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| WO2022252303A1 (en) | 2022-12-08 |
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