CN108637899B - Abrasive flow processing grid group hole special fixture - Google Patents
Abrasive flow processing grid group hole special fixture Download PDFInfo
- Publication number
- CN108637899B CN108637899B CN201810409956.5A CN201810409956A CN108637899B CN 108637899 B CN108637899 B CN 108637899B CN 201810409956 A CN201810409956 A CN 201810409956A CN 108637899 B CN108637899 B CN 108637899B
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- Prior art keywords
- grid
- drainage plate
- holes
- workpiece
- clamp
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- 238000005111 flow chemistry technique Methods 0.000 title claims abstract description 9
- 239000003082 abrasive agent Substances 0.000 claims abstract description 19
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 238000005498 polishing Methods 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
- B24B31/116—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using plastically deformable grinding compound, moved relatively to the workpiece under the influence of pressure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
A special fixture for abrasive flow processing grid group holes comprises: the grinding wheel polishing clamp is characterized in that the clamp upper cover (1) and the clamp base (4) are provided with through holes for abrasive material to pass through, a cuboid clamp body (2) is installed in the support ring (3), a grid workpiece (7) with grid group holes is positioned in the cuboid clamp body (2) through a lower drainage plate (5) and an upper drainage plate (9) which are manufactured in an additive mode and have the same hole positions, the center line of each grid group hole in the grid workpiece (7) is parallel to the center line of the through holes for abrasive material to pass through in the clamp upper cover (1) and the clamp base (4), and therefore abrasive material can rapidly pass through the hole walls of the grid groups in the workpiece and can be polished; the grid workpiece (7) is respectively connected with the lower drainage plate (5) and the upper drainage plate (9) through bolts. The invention has simple structure, high processing efficiency and good quality.
Description
Technical Field
The invention relates to a special fixture, in particular to a special fixture for polishing the inner part of a grid hole, and specifically relates to a special fixture for processing grid group holes by abrasive flow.
Background
The abrasive flow machining is a new process developed from surface machining, the machining accessibility of the machining method is high, the machining method has remarkable advantages particularly for complex cavity structures, burrs and flashes can be effectively removed, the roughness of the surface of a workpiece is reduced, and therefore the requirement for precision machining is met.
The polishing processing of the oblique crowd's hole of grid is a difficult problem, uses traditional processing technology to need to consume a large amount of manpowers, and efficiency is not high moreover, uses the abrasive material stream processing can effectually get rid of the recast layer of grid hole, reaches precision finishing's requirement.
One of the key factors in abrasive flow machining is the design of the fixture, and the constrained flow channel formed by reasonable fixture design has great influence on the machining quality, especially on the protection of local features and the excitation of turbulence. The simplification degree and operability of the clamp design have an important influence on the machining efficiency in actual production. Disclosure of Invention
The invention aims to design a special fixture for processing a group of holes of a grating by abrasive flow aiming at the problem of inconvenient processing of the interior of inclined holes of the grating so as to remove a recast layer of inner holes of the grating, reduce the surface roughness of the inner holes of the grating and protect sharp edges of the inner holes.
The technical scheme of the invention is as follows:
a special fixture for abrasive flow processing grid group holes comprises: the clamp comprises an upper clamp cover 1, a support ring 3 and a clamp base 4, wherein the upper clamp cover 1 and the clamp base 4 are respectively arranged at two ends of the support ring 3, and the clamp is characterized in that through holes for abrasive material to pass through are formed in the upper clamp cover 1 and the clamp base 4, a cuboid clamp body 2 is arranged in the support ring 3, a grid workpiece 7 with grid group holes is positioned in the cuboid clamp body 2 through a lower drainage plate 5 and an upper drainage plate 9 which are manufactured in an additive mode and have the same hole position, the central line of each grid group hole in the grid workpiece 7 is parallel to the central line of the through holes for abrasive material to pass through in the upper clamp cover 1 and the clamp base 4, so that the abrasive material rapidly passes through the hole wall of the grid group hole in the workpiece and polishes the hole wall, and the grid workpiece 7 is connected with the lower drainage plate 5 and the upper drainage plate.
A lower clapboard 6 is additionally arranged between the grating workpiece 7 and the lower drainage plate 5, and an upper clapboard 8 is additionally arranged between the grating workpiece 7 and the upper drainage plate 9.
The thickness of the lower partition plate 6 and the upper partition plate 8 is 1-2 mm, so that a gap of 1-2 mm is reserved between the grid group holes and the drainage plate group holes, and the gap can enable a gap of 1-2 mm to be reserved between the grid group holes and the drainage plate group holes; abrasive materials can be slightly diffused to the periphery in the gap of 1-2 mm after flowing out of the drainage plate, most of abrasive materials continue to move forwards by means of inertia and flow into a workpiece due to the fact that the gap is short, but the machining range is enlarged, the edge of the diamond hole is machined, and the machining problem caused by hole position positioning micro-deviation can be relieved.
The lower drainage plate 5 and the upper drainage plate 9 are structural members manufactured by adopting PLA or photosensitive resin as raw materials in an additive mode, so that the sizes of the drainage plate group holes and the grid group holes are consistent.
The lower drainage plate 5 and the upper drainage plate 9 are provided with a plurality of small bosses for supporting the grid workpiece 7 on the surface opposite to the grid workpiece 7 so as to enhance the integral strength.
The small bosses are positioned on the main rib edges of the grid holes on the lower drainage plate 5 and the upper drainage plate 9.
The four sides of the lower drainage plate 5 and the upper drainage plate 9 are bevel edge structures, and the inclination angles of the bevel edge structures are consistent with the inclination angles of the inner holes of the grid workpiece 7, so that the flowing direction of the abrasive is consistent with the direction of a workpiece flow channel.
The invention has the beneficial effects that:
the invention provides a set of reasonable and usable clamps for polishing and processing the group holes of the grating by abrasive flow, which can not only remove the recast layer of the inner holes of the grating and reduce the surface roughness of the inner holes of the grating, but also protect the sharp edges of the inner holes of the grating.
The invention applies the 3D printing technology to the manufacture of the drainage plate for the first time, so that the matching of the drainage plate and the product grating plate is more accurate.
The invention can lead the flow direction of the abrasive material flow to be more comprehensive by adding the partition plate, can increase the processing of the surface of the grid hole, and can not damage the sharp edge.
The invention enhances the strength of the product by adding the small lug boss, so that the product has smaller deformation in the processing process.
Drawings
FIG. 1 is a schematic view of the construction of a grid work piece of the present invention.
Fig. 2 is a schematic structural view of the exclusive clamp of the present invention.
Fig. 3 is a schematic view of the external structure of the clamp body of the invention.
Fig. 4 is a schematic structural diagram of the external shape of the clamp base of the invention.
FIG. 5 is a schematic view of the construction of a flow guide plate of the present invention.
In the figure: 1. an upper cover of the clamp; 2. a clamp body; 3. a support ring; 4. a clamp base; 5. a lower drainage plate; 6. a lower partition plate; 7. a grid workpiece; 8. an upper partition plate; 9. and an upper drainage plate.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1-5.
A special fixture for processing grid group holes by abrasive flow polishing is shown in figure 1, a titanium alloy rectangular group hole grid plate part is shown, parallelogram inclined holes are distributed in the central area of the titanium alloy rectangular group hole grid plate part in an array mode, and 4 small holes with the diameter of 6mm are distributed on the periphery of a workpiece. In order to complete the abrasive flow processing of the grating workpiece 7 shown in fig. 1, a special fixture is designed as shown in fig. 2, the special fixture comprises a fixture upper cover 1, a fixture body 2, a support ring 3, a fixture base 4, a lower drainage plate 5, a lower partition plate 6, an upper partition plate 8 and an upper drainage plate 9, the fixture body 2 is structurally shown in fig. 3, a hole for mounting the rectangular fixture body 2 is a stepped hole to ensure the positioning of the fixture body, and the fixture base 4 is structurally shown in fig. 4. The support ring 3, the clamp upper cover 1 and the clamp base 4 are in clearance fit. The clamp body 2, the clamp upper cover 1 and the clamp base 4 are in clearance fit. Grid work piece 7 is connected with lower drainage plate 5 and upper drainage plate 9 through the bolt, and anchor clamps upper cover 1, anchor clamps base 4 and anchor clamps body 2 are used for the location of work piece and press from both sides tightly, and lower drainage plate 5 and upper drainage plate 9 are fixed a position through the contact of both ends face and the inner wall of anchor clamps body 2, and the hole one-to-one of lower drainage plate 5 and upper drainage plate 9 should be with the array crowd hole one-to-one of grid work piece 7. As shown in fig. 2, the upper fixture cover 1 and the base fixture 4 are respectively installed at two ends of the support ring 3, the upper fixture cover 1 and the base fixture 4 are provided with through holes for abrasive material to pass through, the support ring 3 is provided with the cuboid fixture body 2, the grid workpiece 7 with grid group holes is positioned in the cuboid fixture body 2 through the lower drainage plate 5 and the upper drainage plate 9 which are manufactured by additive manufacturing and have the same hole positions, and the central line of each grid group hole on the grid workpiece 7 is parallel to the central line of the through hole for abrasive material to pass through on the upper fixture cover 1 and the base fixture 4, so that the abrasive material can rapidly pass through the hole walls of the grid groups on the workpiece and polish the hole walls. Add between grid work piece 7 and lower drainage plate 5 and be equipped with thickness and be 1~2mm lower baffle 6, add between grid work piece 7 and last drainage plate 9 and be equipped with thickness and be 1~2mm upper baffle 8 to guarantee to leave 1~2 mm's space between grid crowd's hole and the drainage plate crowd's hole. In specific implementation, the lower drainage plate 5 and the upper drainage plate 9 are preferably made of PLA or photosensitive resin as a raw material by additive manufacturing, so as to ensure that the size of the drainage plate group holes is consistent with that of the grid group holes. In order to enhance the strength of the grid workpiece 7 and prevent the grid workpiece from deforming, in specific implementation, a plurality of small bosses for supporting the grid workpiece 7 are further arranged on the surfaces, opposite to the grid workpiece 7, of the lower drainage plate 5 and the upper drainage plate 9 so as to enhance the overall strength, and as shown in fig. 5, the small bosses are generally positioned on main ribs of grid holes on the lower drainage plate 5 and the upper drainage plate 9. In order to realize the positioning of the grid workpiece 7 in the cuboid clamp body 2, four sides of the lower drainage plate 5, the upper drainage plate 9 and the upper and lower partition plates are all designed into bevel edge structures, and the inclination angles of the four sides are consistent with the inclination angle of an inner hole of the grid workpiece 7, so that the flowing direction of the abrasive is consistent with the flow direction of the workpiece.
The assembly process of the invention is as follows:
connect grid work piece 7 between lower drainage plate 5 and upper drainage plate 9 through the bolt earlier, place the baffle of one deck 1~2mm between lower drainage plate 5 and upper drainage plate 9 and the grid work piece 7 and make and leave 1~2 mm's space between grid crowd's hole and the drainage plate crowd's hole. Abrasive materials can be slightly diffused to the periphery in the gap of 1-2 mm after flowing out of the drainage plate, most of abrasive materials continue to move forwards by means of inertia and flow into a workpiece due to the fact that the gap is short, but the machining range is enlarged, the edge of the diamond hole is machined, and the machining problem caused by hole position positioning micro-deviation can be relieved. All adopt clearance fit between support ring 3 and anchor clamps upper cover 1 and the anchor clamps base 4, anchor clamps upper cover 1, anchor clamps base 4 and the anchor clamps body 2 be used for grid work piece 7 the location with press from both sides tightly, lower drainage plate 5 and last drainage plate 9 are fixed a position through the contact of both ends face and the inner wall of the anchor clamps body 2, the hole one-to-one of lower drainage plate 5 and last drainage plate 9 should with the array crowd hole of grid work piece 7. The planes of the lower drainage plate 5 and the upper drainage plate 9 close to the grating are provided with small bosses for supporting the grating workpiece 7 and enhancing the overall strength, as shown in fig. 5.
The working pressure of the machine tool is set to be 15MPa, when 480-mesh silicon carbide abrasive with the viscosity of 2400Pa & S is selected for machining, abrasive flow circularly flows up and down, and the abrasive flows through the grating holes in the drainage plate and then continuously moves forwards by means of inertia to flow into the grating workpiece 7. When the cycle number reaches 100 times, usable roughness meter measures the polishing effect, and measuring result shows that the roughness Ra of grid hole can reach 1.6, and so on, the sharp limit of grid hole has also obtained the assurance.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (5)
1. A special fixture for abrasive flow processing grid group holes comprises: the grinding wheel polishing clamp is characterized in that the clamp upper cover (1) and the clamp base (4) are provided with through holes for abrasive material to pass through, a cuboid clamp body (2) is installed in the support ring (3), a grid workpiece (7) with grid group holes is positioned in the cuboid clamp body (2) through a lower drainage plate (5) and an upper drainage plate (9) which are manufactured in an additive mode and have the same hole positions, the center line of each grid group hole in the grid workpiece (7) is parallel to the center line of the through holes for abrasive material to pass through in the clamp upper cover (1) and the clamp base (4), and therefore abrasive material can rapidly pass through the hole walls of the grid groups in the workpiece and can be polished; the grid workpiece (7) is respectively connected with the lower drainage plate (5) and the upper drainage plate (9) through bolts, a lower partition plate (6) is additionally arranged between the grid workpiece (7) and the lower drainage plate (5), and an upper partition plate (8) is additionally arranged between the grid workpiece (7) and the upper drainage plate (9); the thicknesses of the lower partition plate (6) and the upper partition plate (8) are 1-2 mm, so that a gap of 1-2 mm is reserved between the grid group holes and the drainage plate group holes; the abrasive material flows out of the drainage plate and then slightly diffuses to the periphery in a gap of 1-2 mm.
2. The special fixture for abrasive flow processing grid holes of claim 1, wherein the lower drainage plate (5) and the upper drainage plate (9) are structural members manufactured by adopting PLA or photosensitive resin as raw materials in an additive mode, so that the sizes of the drainage plate holes and the grid holes are consistent.
3. The special fixture for abrasive flow machining grid holes as claimed in claim 1, wherein a plurality of bosses for supporting the grid workpiece (7) are arranged on the surface of the lower flow guide plate (5) and the upper flow guide plate (9) opposite to the grid workpiece (7) so as to enhance the overall strength.
4. The special fixture for abrasive flow processing grid holes as claimed in claim 3, wherein the bosses are positioned on the main ribs of the grid holes on the lower drainage plate (5) and the upper drainage plate (9).
5. The special fixture for abrasive flow processing grid group holes as claimed in claim 1, wherein four sides of the lower drainage plate (5) and the upper drainage plate (9) are all bevel edge structures, and the inclination angle of the bevel edge structures is consistent with that of the inner holes of the grid workpiece (7), so that the abrasive flow direction is consistent with the workpiece flow channel direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810409956.5A CN108637899B (en) | 2018-05-02 | 2018-05-02 | Abrasive flow processing grid group hole special fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810409956.5A CN108637899B (en) | 2018-05-02 | 2018-05-02 | Abrasive flow processing grid group hole special fixture |
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| Publication Number | Publication Date |
|---|---|
| CN108637899A CN108637899A (en) | 2018-10-12 |
| CN108637899B true CN108637899B (en) | 2020-08-18 |
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| CN201810409956.5A Active CN108637899B (en) | 2018-05-02 | 2018-05-02 | Abrasive flow processing grid group hole special fixture |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109015365B (en) * | 2018-07-25 | 2021-04-27 | 成都飞机工业（集团）有限责任公司 | Abrasive flow processing grid group hole special fixture |
| CN110712134A (en) * | 2019-10-18 | 2020-01-21 | 大连理工大学 | Integrated clamping-free structure and abrasive flow processing method thereof |
| CN111843686B (en) * | 2020-08-03 | 2021-11-19 | 诸暨市开翎工业设计有限公司 | Air purifier filter panel production and processing equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5746691A (en) * | 1997-06-06 | 1998-05-05 | Global Therapeutics, Inc. | Method for polishing surgical stents |
| CN102166735B (en) * | 2011-02-25 | 2013-07-24 | 浙江工业大学 | Soft abrasive particle flow constraint runner device |
| CN204772133U (en) * | 2015-06-15 | 2015-11-18 | 鹰普（中国）有限公司 | Abrasive flow burring frock |
| CN105252408B (en) * | 2015-11-07 | 2017-08-29 | 靖江先锋半导体科技有限公司 | A kind of hole inwall grinding and polishing fixture |
| CN205465650U (en) * | 2015-12-15 | 2016-08-17 | 广东工业大学 | It is mipor from high -speed abrasive flow burnishing device of pressure boost to cluster |
| CN206305962U (en) * | 2016-12-09 | 2017-07-07 | 沈阳航天新光集团有限公司 | Group hole thin aluminum sheet abrasive Flow fixture |
| CN107127684B (en) * | 2017-06-05 | 2018-09-11 | 南京航空航天大学 | Variable cross-section abnormity channel design abrasive flows skin processing special fixture |
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| CN108637899A (en) | 2018-10-12 |
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