Optical mirror surface milling and grinding machining device

Abstract

The utility model discloses an optical mirror surface milling and grinding device which comprises a lower base, a lower base through hole penetrating through the upper end and the lower end is formed in the axial center of the lower base, an upper base center restraining shaft in a round head bolt shape is installed in the lower base through hole, and the top of the upper base center restraining shaft is higher than the top of the lower base through hole. A plurality of lower base clamping positions are uniformly arranged in the circumferential direction of the lower base; an upper base is further arranged at the top of the lower base, a plurality of upper base clamping positions are evenly arranged on the upper base in the circumferential direction, and the upper base clamping positions and the lower base clamping positions are connected in a one-to-one correspondence mode; and a plurality of mirror surface limiting blocks are uniformly arranged in the circumferential direction of the upper base. According to the device disclosed by the utility model, by adopting the modes of coarse positioning of the central constraint shaft of the upper base, tight fit of the wedge-shaped surface and positioning of the knob, high-precision, namely micron-sized quick resetting of a machined workpiece is realized, and unnecessary workpiece resetting workload and time loss are reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical precision instrument technical field relates to grinding manufacturing, specifically relates to an optical mirror milling and grinding device. BACKGROUND

[0002] As the first link of optical cold processing, the super-precision grinding of optical element surface has a decisive influence on the whole mirror surface processing quality and the shortening of project development cycle. In order to do a good job, the tool must be good, and the traditional optical element is fixed on the machine tool workbench by vacuum adsorption. Although this method is simple to install and easy to disassemble, it also has advantages and disadvantages.

[0003] Firstly, the vacuum chuck has congenital structural defects, hidden processing risks, and unstable base surface inclination and surface type precision. Limited by different optical element diameters, one size of chuck can only meet the adsorption of a specific diameter element. Generally, the diameter of the optical element to be processed increases by 50mm, a corresponding set of chucks needs to be adapted. Under smaller diameter (≤200mm), a variable diameter sleeve needs to be installed first, and then the chuck is installed. The multi-layer metal structure nesting often causes error accumulation, so it cannot meet the direct use requirements. The current correction method is to bond a layer of flexible polyurethane on the adsorption surface of the chuck and use the machine tool's own grinding wheel to flatten. In theory, this correction method is close to the machining precision of the machine tool itself, and can achieve um-level flattening, but in practice, it is found that due to the fluctuation of adsorption pressure and the elastic deformation of polyurethane, this method is quite unstable for the inclination and surface type precision control of the processed optical element surface. The inclination often fluctuates in the range of 20um-60um, and the secondary reset precision is very poor, which directly affects the further improvement of the surface type precision of the optical element surface. For the processing quality control of optical elements with very high precision requirements, it is unacceptable.

[0004] At the same time, polyurethane is a loose porous medium, and the contact surface between the chuck and the workpiece is very easy to suck in the grinding fluid during the operation of the machine tool. Generally, the processing process will last for several hours or even longer. If the workpiece adsorption shaft (machine tool C shaft) is watered for a long time, the adsorption pressure will fail and the processing will stop, which has a great risk of falling of the element during processing. When processing large-diameter (≥200mm) elements, although the variable diameter sleeve is no longer used, the large-diameter chuck is usually made of aluminum alloy in whole, and it is difficult to improve the precision of the processed chuck itself to silk level. At this time, the contact between the tooling and the spindle table is not sufficient, which causes the structure to be unstable and slightly shaking (silk level), and the element surface type precision is introduced into the Power error during processing.

[0005] Secondly, the suction cup adsorption process operation is not good, seriously restricts the processing efficiency. Generally, the suction cup and the grinding wheel dressing device share the machine tool C shaft, the grinding wheel needs to be frequently dressed to ensure the grinding surface quality during the workpiece machining process, and the vacuum suction cup must be completely disassembled when the dressing stone is replaced. After the grinding wheel dressing is completed, the suction cup is reset. Especially when machining large-diameter (≥500mm) optical elements, the weight of the element often exceeds 50kg, and the suction cup needs to be frequently installed and disassembled, which brings great inconvenience to the operator. Each replacement requires 3-4 people to cooperate, consumes a lot of time and effort, and greatly restricts the processing efficiency. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an optical mirror surface milling and grinding processing device to solve the technical problem that the precision of secondary resetting in the optical mirror surface milling and grinding processing process in the prior art needs to be further improved.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme to achieve it:

[0008] An optical mirror surface milling and grinding processing device, comprising a lower base, the axial center of the lower base is provided with a lower base through hole penetrating through the upper and lower ends, a round head bolt-shaped upper base center constraint shaft is installed in the lower base through hole, and the top of the upper base center constraint shaft is higher than the top of the lower base through hole.

[0009] The lower base is uniformly provided with a plurality of lower base clamping positions in the circumferential direction.

[0010] The top of the lower base is also provided with an upper base, and the upper base is uniformly provided with a plurality of upper base clamping positions in the circumferential direction, and the upper base clamping positions are connected one by one with the lower base clamping positions.

[0011] The upper base is also uniformly provided with a plurality of mirror surface limiting blocks in the circumferential direction.

[0012] The utility model also has the following technical features:

[0013] Specifically, the lower base further comprises a disc-shaped lower base plate, a disc-shaped flange plate mounting groove is arranged at the bottom center of the lower base plate, a flange plate is arranged in the flange plate mounting groove, the bottom plate of the flange plate is coaxially embedded and fixed at the bottom of the lower base plate, and the shaft of the flange plate is connected with the hydraulic chuck of the machine tool C shaft.

[0014] The upper base center constraint shaft is nested in the inner diameter of the flange plate through the lower base through hole.

[0015] The lower base is fixedly connected with a plurality of lower base clamping positions on the circumferential outer contour of the lower base plate.

[0016] Specifically, the bottom of the lower base plate is provided with a plurality of countersunk screw holes along the axial direction, and a countersunk screw is arranged in each countersunk screw hole.

[0017] The top of the upper base center constraint shaft is provided with two constraint shaft fixing screw holes along the axial direction, and a constraint shaft fixing bolt is arranged in each constraint shaft fixing screw hole.

[0018] The top of the lower base plate is provided with a plurality of lower base plate annular grooves from the outside to the inside.

[0019] Preferably, the bottom of the lower base plate is symmetrically provided with a plurality of polygonal lower base plate lightening grooves.

[0020] The upper base center constraint shaft is provided with a through hole along the axial center.

[0021] Specifically, the upper base further comprises a workpiece loading disc, and the bottom of the workpiece loading disc is in contact with the top of the lower base plate.

[0022] The circumferential outer contour of the workpiece loading disc is fixedly connected with a plurality of upper base clamping positions, and the upper base clamping positions can be wedge-shaped surface matched with the lower base clamping positions.

[0023] The inner part of the upper base clamping position is provided with an upper base clamping position fixing screw hole along the tangential direction of the workpiece loading disc.

[0024] A plurality of mirror surface limiting blocks are uniformly arranged on the circumferential upper surface of the workpiece loading disc.

[0025] Preferably, the workpiece loading disc is disc-shaped or octagonal disc-shaped.

[0026] Preferably, the mirror surface limiting block comprises a threaded top block arranged along the tangential direction of the workpiece loading disc, and the threaded top block is provided with an axial mounting screw hole at both ends, and a mounting screw is arranged in each mounting screw hole.

[0027] The middle of the threaded top block is further provided with a mirror surface fixing screw hole along the radial direction of the workpiece loading disc, and a mirror surface fastening screw is arranged in the mirror surface fixing screw hole.

[0028] Preferably, the bottom of the workpiece loading disc is provided with a disc-shaped constraint shaft mounting groove.

[0029] The bottom of the workpiece loading disc is provided with a plurality of workpiece loading disc annular grooves concentrically from the outside to the inside, and the inner circle of the workpiece loading disc annular groove is provided with a concentric constraint shaft mounting groove.

[0030] Preferably, the bottom of the workpiece loading disc is also provided with a plurality of groups of polygonal workpiece loading disc lightening grooves in a central symmetry.

[0031] Preferably, the circumferential outer contour of the workpiece loading disc is also fixedly connected with a plurality of groups of central symmetric lifting ring screws, which are uniformly arranged on the circumferential outer contour of the workpiece loading disc along the radial direction of the workpiece loading disc.

[0032] Compared with the prior art, the device has the following beneficial technical effects:

[0033] (I) The device of the utility model realizes high-precision, i.e. micron-level, rapid resetting of the workpiece, reduces unnecessary workpiece resetting workload and time loss, through the coarse positioning of the upper base central constraint shaft, the tight fit of the wedge surface, and the positioning knob.

[0034] (II) The device of the utility model realizes one-time component fixing, multi-round machining detection, and parallel iterative machining of different workpieces through modular design, reasonable configuration of structural weight, upper and lower base butt joint design, and the advantages of modularization to replace different workpiece loading discs, greatly improves the convenience of process operation and the flexibility of process flow, and solves the problems of single caliber and poor universality in the traditional vacuum adsorption method.

[0035] (III) The device of the utility model realizes a high-precision machining reference surface of the whole caliber, and can stably control the bottom surface perpendicularity, i.e. inclination error, of the optical element in the machining process to within 3um from the traditional chuck adsorption method of 20-50um.

[0036] (IV) The device of the utility model realizes online dressing of the grinding wheel by integrating the grinding wheel dressing device, and improves the surface grinding quality of the machined component.

[0037] (V) The device of the utility model avoids the risk of workpiece damage caused by machine tool C-axis adsorption water and shutdown during machining through simple and reliable mechanical connection. BRIEF DESCRIPTION OF DRAWINGS

[0038] Fig. 1(a) is a schematic diagram of the overall structure of the device of the utility model.

[0039] Fig. 1(b) is a top view of Fig. 1(a).

[0040] Fig. 2(a) is a structural schematic view of the upper base when a workpiece loading disc with a diameter of 0-400mm is used.

[0041] Fig. 2(b) is a left view of Fig. 2(a).

[0042] Fig. 2(c) is a rear view of Fig. 2(a).

[0043] Fig. 3(a) is a structural schematic view of the upper base when a workpiece loading disc with a diameter of 400-750mm is used.

[0044] Fig. 3(b) is a left view of Fig. 3(a).

[0045] Fig. 4(a) is a structural schematic view of the lower base when a workpiece loading disc with a diameter of 400-750mm is used.

[0046] Fig. 4(b) is a sectional view of Fig. 4(a) at position C.

[0047] Fig. 4(c) is a rear view of Fig. 4(a).

[0048] Figure 5 Fig. 5 is a physical view of the device in the utility model.

[0049] Fig. 6(a) is a test view of the peak-valley value with an inclined surface type in the traditional chuck fixing mode, and the PV value is 33um.

[0050] Fig. 6(b) is a test view of the peak-valley value without an inclined surface type in the traditional chuck fixing mode, and the PV value is 6um.

[0051] Fig. 6(c) is a test view of the peak-valley value with an inclined surface type in the fixing mode in the utility model, and the PV value is 6um.

[0052] Fig. 6(d) is a test view of the peak-valley value without an inclined surface type in the fixing mode in the utility model, and the PV value is 4um.

[0053] The meanings of the respective reference numerals in the drawings are as follows: 1 - lower base, 2 - upper base, 3 - machine tool C shaft, 4 - optical mirror blank.

[0054] 101 - lower base through hole, 102 - upper base center constraint shaft, 103 - lower base clamping position, 104 - lower base plate, 105 - flange plate installation groove, 106 - flange plate, 107 - lower base clamping position fixing screw hole, 108 - positioning knob.

[0055] 201 - upper base clamping position, 202 - mirror surface limiting block, 203 - workpiece loading disc, 204 - clamping position fixing screw hole.

[0056] 10201-constraint shaft fixing screw hole, 10202-constraint shaft fixing bolt, 10203-constraint shaft through hole.

[0057] 10401-countersunk screw hole, 10402-countersunk screw, 10403-lower chassis annular groove, 10404-lower chassis lightening groove.

[0058] 20201-threaded top block, 20202-mounting threaded hole, 20203-mounting bolt, 20204-mirror surface fixing threaded hole, 20205-mirror surface fastening bolt.

[0059] 20301-workpiece loading disc annular groove, 20302-workpiece loading disc lightening groove, 20303-lifting ring screw, 20304-constraint shaft mounting groove.

[0060] The specific content of the utility model is further explained and described in detail in combination with the embodiments. DETAILED DESCRIPTION

[0061] It should be noted that all the devices and parts in the utility model, if not specially stated, all adopt the devices and parts known in the prior art.

[0062] In the utility model, the silk level is 10um level. In mechanical size measurement, 1mm is usually divided into one hundred parts, and the length unit represented by one part is called a silk; a silk is 0.01mm, that is, 10um.

[0063] In the utility model, the bottom surface perpendicularity is the inclination amount.

[0064] According to the above technical scheme, the specific embodiments of the utility model are given below, and it should be noted that the utility model is not limited to the following specific embodiments, and any equivalent transformation based on the technical scheme of the application falls within the protection scope of the utility model.

[0065] Embodiment:

[0066] The embodiment gives an optical mirror milling and grinding device, as shown in Fig. 4(b), which comprises a lower base 1, the axial center of the lower base 1 is provided with a lower base through hole 101 penetrating through the upper and lower ends, a round head bolt-shaped upper base center constraint shaft 102 is installed in the lower base through hole 101, and the top of the upper base center constraint shaft 102 is higher than the top of the lower base through hole 101.

[0067] As shown in Fig. 1(b), the lower base 1 is uniformly provided with a plurality of lower base clamping positions 103 in the circumferential direction.

[0068] As shown in Fig. 1(a) and Figure 5As shown, the top of the lower base 1 is also provided with an upper base 2, and the upper base 2 is uniformly provided with a plurality of upper base clamping grooves 201 in the circumferential direction, which are connected with the lower base clamping grooves 103 one by one.

[0069] As shown in FIG. 1(b), the upper base 2 is also uniformly provided with a plurality of mirror surface limiting blocks 202 in the circumferential direction.

[0070] As a preferred scheme of the present embodiment, as shown in FIG. 4(b), the lower base 1 further comprises a disc-shaped lower base plate 104, the bottom center of the lower base plate 104 is provided with a disc-shaped flange plate mounting groove 105, and the flange plate mounting groove 105 is provided with a flange plate 106, the bottom plate of the flange plate 106 is coaxially embedded and fixed at the bottom of the lower base plate 104, and the shaft of the flange plate 106 is connected with the hydraulic chuck of the machine tool C-axis 3.

[0071] As shown in FIG. 4(b), the upper base center constraint shaft 102 is nested in the inner diameter of the flange plate 106 through the lower base through hole 101.

[0072] As shown in FIG. 4(a), the lower base plate 104 is fixedly connected with a plurality of lower base clamping grooves 103 on the outer circumferential contour, and each lower base clamping groove 103 is provided with a lower base clamping groove fixed screw hole 107 along the tangential direction of the lower base plate 104, and the lower base clamping groove fixed screw hole 107 is provided with a positioning knob 108.

[0073] In the present embodiment, the upper base center constraint shaft 102 is nested in the inner diameter of the flange plate 106 through the lower base through hole 101 and protrudes from the surface of the lower base plate 104, and the protruding section realizes the sub-millimeter level rough positioning when the lower base 1 and the upper base 2 are docked.

[0074] As a preferred scheme of the present embodiment, as shown in FIG. 4(b), the bottom of the lower base plate 104 is provided with a plurality of countersunk screw holes 10401 in the axial direction, each countersunk screw hole 10401 is provided with a countersunk screw 10402, and the countersunk screw 10402 fixes the flange plate 106 through the bottom plate of the flange plate 106.

[0075] As shown in FIG. 4(a), the top of the upper base center constraint shaft 102 is provided with two constraint shaft fixed screw holes 10201 in the axial direction, each constraint shaft fixed screw hole 10201 is provided with a constraint shaft fixed bolt 10202, and the constraint shaft fixed bolt 10202 fixes the top of the upper base center constraint shaft 102 to the top of the lower base plate 104.

[0076] As shown in FIG. 4(a), the top of the lower base plate 104 is concentrically provided with a plurality of lower base plate annular grooves 10403 from the outside to the inside.

[0077] In this embodiment, to ensure that the bottom of the lower base plate 104 is in full contact with the hydraulic chuck table of the C-axis 3 of the machine tool C during installation, the flange plate 106 is fixed to the bottom of the lower base plate 104 by means of the countersunk head screws 10402.

[0078] In this embodiment, the annular groove 10403 of the lower base plate is used to enhance the adhesion between the upper and lower bases.

[0079] As a preferred solution of this embodiment, as shown in FIG. 4(c), a plurality of polygonal lower base plate lightening grooves 10404 are symmetrically arranged at the center of the bottom of the lower base plate 104.

[0080] As shown in FIG. 4(b), the center constraint shaft 102 of the upper base is provided with a through-hole 10203 penetrating both ends in the axial center.

[0081] In this embodiment, a set of diagonally internal threads 10405 symmetrically arranged at the center is further provided on the top of the lower base plate 104.

[0082] In this embodiment, the material of the lower base plate 104 is marble.

[0083] In this embodiment, the lower base plate through-hole 101 and the set of diagonally internal threads 10405 arranged at the axial center of the lower base plate 104 serve as the mounting interface of the grinding wheel dresser, and when the grinding wheel dresser is installed, only the upper base 2 needs to be removed, and the grinding wheel dresser is installed at the position of the center constraint shaft 102 of the upper base. The annular groove on the circumference of the center constraint shaft 102 of the upper base, i.e., the annular groove 10403 of the lower base plate, can also be used to avoid scratches on the surface of the lower base plate 104 caused by repeated installation or removal of the grinding wheel dresser.

[0084] In this embodiment, the lower base plate lightening grooves 10404 are used to reduce the weight of the lower base plate 104.

[0085] As a preferred solution of this embodiment, the upper base 2 further comprises a workpiece loading disc 203, and the bottom of the workpiece loading disc 203 is in contact with the top of the lower base plate 104.

[0086] As shown in FIG. 2(a), a plurality of upper base detents 201 are fixedly connected to the outer profile of the circumference of the workpiece loading disc 203, and the upper base detents 201 and the lower base detents 103 can be tightly fitted with wedge surfaces.

[0087] The inner part of the upper base detent 201 is provided with an upper base detent fixed screw hole 204 along the tangential direction of the workpiece loading disc 203.

[0088] As shown in FIG. 2(a), a plurality of mirror limiting blocks 202 are also uniformly arranged on the upper surface of the circumference of the workpiece loading disc 203.

[0089] In this embodiment, the positioning knob 108 is fixed in the upper base clamping fixed threaded hole 204 through the lower base clamping fixed threaded hole 107, so as to further fix the lower base clamping 103 and the upper base clamping 201. The positioning knob 108 at the original position and the wedge surface between the upper base clamping 201 and the lower base clamping 103 are tightly matched, so as to realize the micron-level accurate positioning when the lower base 1 and the upper base 2 are butted.

[0090] In this embodiment, the positioning knob 108 is composed of a bolt knob with a positioning function and a pre-tightening spring.

[0091] As a preferred scheme of this embodiment, as shown in FIG. 2(a) and FIG. 3(a), the workpiece loading disc 203 is in a disc shape or an octagonal disc shape.

[0092] In this embodiment, the material of the workpiece loading disc 203 is marble.

[0093] In this embodiment, the workpiece loading disc 203 is divided into two specifications of 0-400 mm and 400 mm-750 mm caliber; when the workpiece loading disc 203 is 0-400 mm caliber, the shape of the workpiece loading disc 203 is in a disc shape; when the workpiece loading disc 203 is 400 mm-750 mm caliber, the shape of the workpiece loading disc 203 is in an octagonal disc shape, so as to realize the lightweight requirement.

[0094] As a preferred scheme of this embodiment, as shown in FIG. 2(a) and FIG. 3(a), the mirror limiting block 202 includes a threaded top block 20201 arranged tangentially along the workpiece loading disc 203, and the threaded top block 20201 is provided with axial mounting threaded holes 20202 at both ends, and each mounting threaded hole 20202 is provided with a mounting bolt 20203, and the mounting bolt 20203 fixes the threaded top block 20201 on the upper surface of the workpiece loading disc 203.

[0095] As shown in FIG. 2(a) and FIG. 3(a), the middle of the threaded top block 20201 is further provided with a mirror fixing threaded hole 20204 along the radial direction of the workpiece loading disc 203, and the mirror fixing threaded hole 20204 is provided with a mirror fastening bolt 20205, as shown in FIG. 2(b) and FIG. 3(b), the mirror fastening bolt 20205 fixes the radial direction of the optical mirror blank 4.

[0096] As a preferred scheme of this embodiment, as shown in FIG. 2(c), the bottom of the workpiece loading disc 203 is provided with a disc-shaped constraint shaft mounting groove 20304.

[0097] As shown in Figure 2(c), the bottom of the workpiece loading disc 203 is concentrically provided with a plurality of workpiece loading disc annular grooves 20301 from the outside to the inside, and the inner circle of the workpiece loading disc annular groove 20301 is concentrically provided with a constraint shaft mounting groove 20304.

[0098] In this embodiment, the workpiece loading disc annular groove 20301 is used to enhance the fitting force between the upper and lower bases.

[0099] In this embodiment, the constraint shaft mounting groove 20304 is used for the butt joint installation of the workpiece loading disc 203 and the lower chassis 104, and when the workpiece loading disc 203 and the lower chassis 104 are butt jointed, the constraint shaft mounting groove 20304 is internally mounted with the upper base center constraint shaft 102.

[0100] As a preferred scheme of the present embodiment, as shown in Figure 2(c), the bottom of the workpiece loading disc 203 is also centrally symmetrically provided with a plurality of groups of polygonal workpiece loading disc lightening grooves 20302.

[0101] In this embodiment, the workpiece loading disc lightening groove 20302 is used to reduce the weight of the workpiece loading disc 203.

[0102] As a preferred scheme of the present embodiment, as shown in Figure 2(b), a plurality of groups of center-symmetric lifting ring screws 20303 are also fixedly connected on the circumferential outer contour of the workpiece loading disc 203, and the lifting ring screws 20303 are uniformly arranged on the circumferential outer contour of the workpiece loading disc 203 along the radial direction of the workpiece loading disc 203.

[0103] The working principle of the device in the utility model is as follows: through the marble material with stable physical and chemical properties, a high reference plane is realized, through the modular design, the structure weight is reasonably configured, through the butt joint design of the upper and lower modules, the high-precision reference surface of the workbench can be directly used as an offline detection reference, one-time component fixing is realized, multi-round machining detection is realized, and the process operation steps are simplified; meanwhile, different workpiece loading discs 203 can also be replaced by taking advantage of the modularization, parallel iterative machining of different workpieces is realized; through the coarse positioning of the upper base center constraint shaft 102 + the tight fit of the wedge surface + the positioning knob 108, workpiece high-precision (um level) rapid resetting is realized, unnecessary workpiece resetting workload and time loss are reduced; through the integrated grinding wheel dressing device, the grinding wheel is dressed online, and the machining component surface grinding quality is improved. Through simple and reliable mechanical connection, the risk of workpiece damage caused by machine tool C shaft 3 adsorption water and shutdown during machining is avoided.

[0104] The device in the utility model comprises the following steps when in use:

[0105] Step one, before installing the device, clean the upper surface of the lower base 1 and the lower surface of the upper base 2 with alcohol and a dust-free cloth respectively.

[0106] Step two, after cleaning, the upper base center constraint shaft 102 with rough positioning is inserted into the lower base through hole 101 in the center of the lower base 1, two people cooperate to place the upper base 2 on the lower base 1, rotate the upper base 2 to make the wedge-shaped surface clamping of the upper base clamping 201 and the lower base clamping 103, and then fix the positioning knob 108. The parallelism of the end face of the upper base 2 is checked using a dial gauge, the dial gauge is pressed at a distance of 10mm from the disc face, and the C-axis 3 of the machine tool is uniformly rotated by both hands to ensure that the needle jump does not exceed 10um. If the needle jump is too large, the upper base 2 is disassembled to check whether the bottom surface is clean, and the operation of step one is repeated until the parallelism of the end face of the upper base 2 is qualified.

[0107] Step three, after confirming that the parallelism of the upper base 2 is normal, the optical mirror blank 4 to be processed is carefully placed on the upper base 2, the center of the optical mirror blank 4 is found by lightly tapping with a dial gauge and a rubber hammer, and the outer circle runout is ensured to be not more than 0.03mm. If the outer circle runout is too large, the optical mirror blank 4 should be repaired and then processed, and the dial gauge is used to check whether the end face runout of the optical mirror blank 4 is consistent with the horizontal of the optical mirror blank 4 itself. After the check is correct, evenly drop the glue (HJJ-003 welding agent) on the circumference where the optical mirror blank 4 contacts the upper base 2, and wait for 1.5-2 hours; after the glue solidifies, install the mirror surface limiting block 202 in four directions of the circumference of the optical mirror blank 4 with the installation bolt 20203, adjust the mirror surface fastening bolt 20205, make the mirror surface fastening bolt 20205 contact well with the optical mirror blank 4, and after the mirror surface limiting block 202 is completely installed, cover the hot melt adhesive along the glue solidification position to further prevent the milling and grinding liquid from penetrating into the glue layer during processing; if the machine tool is continuously processed for a long time (120 hours and above), waterproof tape (aluminum foil waterproof tape) needs to be further pasted at the glue joint position, and evenly pasted without wrinkles.

[0108] Step four, after the initial processing is completed, the workpiece loading disc 203 is used as the reference for three-coordinate off-line detection to detect the surface type accuracy, and whether the optical mirror blank 4 is processed qualified is determined according to the detection result; if it is qualified, loosen the installation bolt 20203 on the threaded top block 20201, and prepare to remove the glue; if it is not qualified, re-connect the upper base 2 with the lower base 1 installed on the C-axis 3 of the machine tool, reset the wedge-shaped positioning interface between the upper base 2 and the lower base 1 and the positioning knob 108, and check the reset result with a dial gauge. If the reset is normal, re-process the element until it is qualified. Use an air gun to clean the milling and grinding liquid and glass powder remaining on the surface of the optical mirror blank 4 and the upper base 2, and wash away the residual mirror surface with water, and blow dry the workpiece surface with an air gun again.

[0109] Step five, the upper base 2 with optical mirror blank 4 is taken out together with the lower base 1 to remove the glue (placed in warm water heating 1h to 50~60℃, then keep warm 4~8h can remove the glue layer), finally the optical mirror blank 4 is taken off from the upper base 2 and cleaned up.

[0110] As shown in Fig. 6(a), the PV 33um with inclined surface is fixed by the traditional chucking mode, as shown in Fig. 6(b), the PV 6um without inclined surface is fixed by the traditional chucking mode, which shows that the PV contains the inclination 27um. As shown in Fig. 6(c), the PV 6um with inclined surface is fixed by the fixing mode in the utility model, as shown in Fig. 6(d), the PV 4um without inclined surface is fixed by the fixing mode in the utility model, which shows that the PV contains the inclination 2um. Therefore, compared with the traditional chucking mode, the inclination in the PV is greatly reduced by the fixing mode in the utility model.

Claims

1. An optical surfacing apparatus, comprising: Including lower base (1), the axial center of the lower base (1) is provided with lower base through hole (101) through the upper and lower ends, the upper base center constraint shaft (102) of round head bolt is installed in the lower base through hole (101), the top of the upper base center constraint shaft (102) is higher than the top of the lower base through hole (101); The lower base (1) is uniformly provided with a plurality of lower base clamping positions (103) on the circumference thereof; The top of the lower base (1) is further provided with an upper base (2), the upper base (2) is uniformly provided with a plurality of upper base clamping positions (201) on the circumference thereof, and the upper base clamping positions (201) are connected in one-to-one correspondence with the lower base clamping positions (103); The upper base (2) is further uniformly provided with a plurality of mirror surface limiting blocks (202) on the circumference thereof.

2. The optical figuring apparatus of claim 1, wherein, The lower base (1) further comprises a disc-shaped lower base plate (104), the bottom center of the lower base plate (104) is provided with a disc-shaped flange plate mounting groove (105), the flange plate mounting groove (105) is provided with a flange plate (106), the bottom plate of the flange plate (106) is coaxially embedded and fixed at the bottom of the lower base plate (104), and the shaft of the flange plate (106) is connected with a hydraulic chuck of a machine tool C shaft (3); The upper base center constraint shaft (102) is nested in the inner diameter of the flange plate (106) through the lower base through hole (101); A plurality of lower base clamping positions (103) are fixedly connected on the circumferential outer contour of the lower base plate (104), a lower base clamping position fixing threaded hole (107) is arranged inside each lower base clamping position (103) along the tangential direction of the lower base plate (104), and a positioning knob (108) is arranged in the lower base clamping position fixing threaded hole (107).

3. The optical figuring apparatus of claim 2, wherein the optical figuring apparatus is configured to perform a plurality of figuring operations on the optical surface of the optical article to achieve a desired surface figure of the optical surface. A plurality of countersunk threaded holes (10401) are arranged on the bottom of the lower base plate (104) along the axial direction, a countersunk screw (10402) is arranged in each countersunk threaded hole (10401), and the countersunk screw (10402) fixes the flange plate (106) through the bottom plate of the flange plate (106); Two constraint shaft fixing threaded holes (10201) are arranged on the top of the upper base center constraint shaft (102) along the axial direction, a constraint shaft fixing bolt (10202) is arranged in each constraint shaft fixing threaded hole (10201), and the constraint shaft fixing bolt (10202) fixes the top of the upper base center constraint shaft (102) on the top of the lower base plate (104); A plurality of lower base plate annular grooves (10403) are concentrically arranged on the top of the lower base plate (104) from the outside to the inside.

4. The optical figuring apparatus of claim 2, wherein, A plurality of groups of polygonal lower base plate lightening grooves (10404) are symmetrically arranged on the bottom center of the lower base plate (104); The upper base center constraint shaft (102) is provided with a constraint shaft through hole (10203) penetrating through the upper and lower ends along the axial center.

5. The optical figuring apparatus of claim 1 wherein, The upper base (2) further comprises a workpiece loading disc (203), and the bottom of the workpiece loading disc (203) is in contact with the top of the lower base plate (104). The circumferential outer contour of the workpiece loading disc (203) is fixedly connected with a plurality of upper base clamping positions (201), and the upper base clamping position (201) and the lower base clamping position (103) can realize wedge surface cooperation. The inner part of the upper base clamping position (201) is provided with an upper base clamping position fixed screw hole (204) along the tangential direction of the workpiece loading disc (203); The circumferential upper surface of the workpiece loading disc (203) is also uniformly provided with a plurality of mirror surface limiting blocks (202).

6. The optical figuring apparatus of claim 5 wherein, The workpiece loading disc (203) is disc-shaped or octagonal disc-shaped.

7. The optical figuring apparatus of claim 5 wherein, The mirror surface limiting block (202) includes a threaded top block (20201) arranged along the tangential direction of the workpiece loading disc (203), both ends of the threaded top block (20201) are provided with axial mounting screw holes (20202), each mounting screw hole (20202) is provided with a mounting bolt (20203), and the mounting bolt (20203) fixes the threaded top block (20201) on the upper surface of the workpiece loading disc (203); The middle part of the threaded top block (20201) is also provided with a mirror surface fixed screw hole (20204) along the radial direction of the workpiece loading disc (203), the mirror surface fixed screw hole (20204) is provided with a mirror surface fastening bolt (20205), and the mirror surface fastening bolt (20205) fixes the radial direction of the optical mirror blank (4).

8. The optical figuring apparatus of claim 5 wherein, The bottom of the workpiece loading disc (203) is provided with a disc-shaped constraint shaft mounting groove (20304); The bottom of the workpiece loading disc (203) is concentrically provided with a plurality of workpiece loading disc annular grooves (20301) from the outside to the inside, and the inner circle of the workpiece loading disc annular groove (20301) is concentrically provided with the constraint shaft mounting groove (20304).

9. The optical figuring apparatus of claim 5 wherein, The bottom of the workpiece loading disc (203) is also centrally symmetrically provided with a plurality of groups of polygonal workpiece loading disc lightening grooves (20302).

10. The optical figuring apparatus of claim 5 wherein, The circumferential outer contour of the workpiece loading disc (203) is also fixedly connected with a plurality of groups of centrally symmetric lifting ring screws (20303), and the lifting ring screws (20303) are uniformly arranged on the circumferential outer contour of the workpiece loading disc (203) along the radial direction of the workpiece loading disc (203).

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