CN114571578A - Workpiece forming method - Google Patents
Workpiece forming method Download PDFInfo
- Publication number
- CN114571578A CN114571578A CN202210184497.1A CN202210184497A CN114571578A CN 114571578 A CN114571578 A CN 114571578A CN 202210184497 A CN202210184497 A CN 202210184497A CN 114571578 A CN114571578 A CN 114571578A
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- Prior art keywords
- workpiece
- pressing
- forming method
- plastic bag
- die
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003825 pressing Methods 0.000 claims abstract description 61
- 238000000462 isostatic pressing Methods 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 14
- 238000003754 machining Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000741 silica gel Substances 0.000 claims description 5
- 229910002027 silica gel Inorganic materials 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000009461 vacuum packaging Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010099 solid forming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/003—Pressing by means acting upon the material via flexible mould wall parts, e.g. by means of inflatable cores, isostatic presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/021—Ram heads of special form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/04—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form with one ram per mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0097—Press moulds; Press-mould and press-ram assemblies
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
Abstract
The invention discloses a workpiece forming method, which comprises the following steps: manufacturing a dry pressing die according to the structure of the workpiece, and forming a blank body of the workpiece through powder by using the dry pressing die; manufacturing a wet pressing die matched with the green body according to the structure of the green body, placing the green body in the wet pressing die, and arranging a winding film between the wet pressing die and the green body; packaging the wet pressing mold and the blank together by using a first plastic bag, and vacuumizing the interior of the first plastic bag to form a piece to be pressed; and (3) isostatic pressing the part to be pressed by using an isostatic pressing machine, so that the blank is formed into the workpiece. The workpiece forming method of the invention does not need CNC machining, and has the advantages of simple and convenient machining, high powder utilization rate, high machining efficiency and low cost.
Description
Technical Field
The invention relates to a powder forming process, in particular to a workpiece forming method which does not need CNC machining and is simple and convenient to machine.
Background
The existing forming mode of the wavy curved surface aluminum oxide gear ring on the market is mainly isostatic pressing, the aluminum oxide gear ring is wet-pressed into a large plate, namely, powder is directly formed into solid forming through an isostatic press, a rear isostatic pressing blank is subjected to flat grinding through a vertical lathe, and the wavy curved surface and the periphery of the wavy curved surface are machined to the size through CNC. The isostatic pressing blank body in the mode is a solid square, the subsequent processing has large material removal amount, and the utilization rate of powder is low. And need through the processing of unburned bricks vertical lathe, unburned bricks CNC, CNC processing wavy curved surface time overlength, it is inefficient, with high costs. And CNC processing is because of the easy emergence of shake line and pit of equipment precision condition wavy curved surface, needs artifical manual polishing smoothness, guarantees smooth finish, extravagant manpower.
Disclosure of Invention
The invention aims to provide the workpiece forming method which does not need CNC machining, is simple and convenient to machine, has high powder utilization rate and high machining efficiency and is low in cost.
In order to achieve the above object, the present invention provides a workpiece forming method, comprising the steps of: manufacturing a dry pressing die according to the structure of the workpiece, and forming a blank body of the workpiece through powder by using the dry pressing die; manufacturing a wet pressing die matched with the green body according to the structure of the green body, placing the green body in the wet pressing die, and arranging a winding film between the wet pressing die and the green body; packaging the wet pressing mold and the blank together by using a first plastic bag, and vacuumizing the interior of the first plastic bag to form a piece to be pressed; and (3) isostatic pressing the part to be pressed by using an isostatic pressing machine, so that the blank is formed into the workpiece.
Compared with the prior art, the invention makes the structure appearance of the blank body basically the same as the appearance of the workpiece by manufacturing the dry pressing die in advance and using the dry pressing die to perform powder molding on the blank body of the workpiece; then, isostatic pressing is carried out on the blank body with the aid of a wet pressing die, and further the workpiece can be further accurately pressed on the blank body; therefore, the invention does not need to use CNC for finish machining and material cutting, and has the advantages of very simple and convenient machining and high powder utilization rate. And a winding film is arranged between the wet pressing die and the green body before isostatic pressing, so that the green body can be prevented from sticking the die during demoulding, the green body is prevented from being damaged after isostatic pressing, the green body is effectively protected in the processing process, and the yield is high. In addition, before isostatic pressing, the wet pressing die and the blank body are subjected to vacuum packaging together by using a first plastic bag, so that the gas in the wet pressing die and the blank body can be effectively discharged, the isostatic pressing effect is further improved, and the product forming effect is improved; moreover, the processing mode does not need manual work to polish the workpiece manually again, has high processing efficiency, is beneficial to batch production and has low cost.
Preferably, the method further comprises the following steps before isostatic pressing the member to be pressed: and arranging waterproof pads on the surface and the bottom surface of the piece to be pressed, packaging the piece to be pressed and the waterproof pads together by using a second plastic bag, and vacuumizing the interior of the second plastic bag. Through setting up waterproof pad and right treat the casting die and waterproof pad carries out vacuum packaging, can prevent that the product from intaking after wet pressure, effectively protect the product, improve the yield.
Preferably, the method further comprises the following steps after isostatic pressing: and processing and correcting the outer periphery dimension of the workpiece.
Specifically, the method further comprises the following steps after the machining correction of the outer periphery dimension of the workpiece: and sintering the workpiece. By further sintering the workpiece, the strength of the workpiece can be improved, and the performance of the workpiece can be improved.
Preferably, the dry pressing die comprises an upper die and a lower die, the pressing surface of the lower die is an inverse wave pattern curved surface corresponding to the inner tooth surface of the workpiece, and the pressing surface of the upper die is an arc-shaped curved surface corresponding to the outer side surface of the workpiece.
Preferably, the first plastic bag is a PE bag, and the thickness of the first plastic bag is 0.1 mm.
Specifically, the waterproof pad is the silica gel pad, and thickness is 1 mm. Through setting up the silica gel pad, it both can not break under bearing great pressure, can get up waterproof effect again to effectively protect the body under the isostatic pressing, effectively improve the yield.
Specifically, the second plastic bag is a PE bag.
Preferably, the isostatic pressure is in the range of 140MPa to 170 MPa.
Preferably, the dwell time of the isostatic pressing is between 25 minutes and 35 minutes.
Drawings
FIG. 1 is a block diagram of a workpiece according to the present invention.
Fig. 2 is a structural view of a dry-pressing mold used in the workpiece forming method of the present invention.
Fig. 3 is a block diagram of the wet-pressing mold and the green body of the present invention after they are packaged together.
Fig. 4 is a flow chart of a workpiece forming method of the present invention.
Detailed Description
In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following detailed description is given with reference to the embodiments and the accompanying drawings.
As shown in fig. 1 to 4, the workpiece forming method of the present invention is suitable for forming one arc-shaped segment of a circular ring gear, and includes the following steps:
step S1, manufacturing a dry pressing mold 1 according to the structure of the workpiece 200, and forming a blank of the workpiece 200 by powder molding using the dry pressing mold 1.
Step S2, manufacturing a wet pressing die 2 matched with the blank according to the blank structure, placing the blank in the wet pressing die 2, and arranging a winding film 3 between the wet pressing die 2 and the blank.
Step S3, the wet pressing mold 2 and the blank are sealed together by a first plastic bag 4, and the interior of the first plastic bag 4 is vacuumized to form a member to be pressed.
Step S4, arranging waterproof pads 5 on the surface and the bottom surface of the member to be pressed, then sealing the member to be pressed and the waterproof pads 5 together with a second plastic bag 6, and vacuumizing the interior of the second plastic bag 6.
And step S5, isostatic pressing is carried out on the member to be pressed by using an isostatic pressing machine, so that the blank body forms the workpiece 200.
Step S6 is a step of machining and correcting the outer peripheral dimension of the workpiece 200.
Step S7, sintering the workpiece 200. By further sintering the workpiece 200, the strength thereof can be improved, and the performance of the workpiece 200 can be improved.
Referring to fig. 2 again, in step S1, before dry pressing, a blank-burning drawing is designed according to a finished drawing, the blank-burning drawing is converted into a green drawing, finally, a wet pressing dimension is pushed out according to the green drawing, and a dry pressing mold 1 is designed according to the green drawing, the dry pressing mold 1 includes an upper mold 11 and a lower mold 12, a pressing surface of the lower mold 12 is an inverse raised grain curved surface 12a corresponding to an inner tooth surface of the gear ring, and a pressing surface of the upper mold 11 is an arc curved surface 11a corresponding to an outer side surface of the gear ring. Thus, the density of the blank body pressed by dry pressing is uniform, and the deformation is small during the subsequent isostatic pressing.
Referring to fig. 3, in step S2, after dry pressing, the blank is not directly isostatic pressed because the product structure is wavy, uneven, and the dry pressing density is not uniform, otherwise the product structure is deformed and distorted, and therefore, a special auxiliary tool is required to be used in cooperation with wet pressing. In this step, the wet-pressing mold 2 may be designed according to the aforementioned wet-pressing size, and the green body may have a more uniform density by assisting the green body with the wet-pressing by the wet-pressing mold 2. Wet pressing die utensil 2 also includes mould 21 and lower mould 22, the pressure face of lower mould be with the anti-ripple curved surface that the internal tooth of ring gear corresponds, the pressure face of going up the mould be with the arc curved surface that the lateral surface of ring gear corresponds.
Referring to fig. 3, in step S3, the first plastic bag 4 is a PE bag, the shape of the first plastic bag 4 is designed according to the size of the wet pressing mold 2, and in this embodiment, the length of the first plastic bag 4 is 500mm, the width thereof is 360mm, and the thickness thereof is 0.1 mm.
Referring to fig. 3, in step S4, the waterproof pad 5 is a silica gel pad with a thickness of 1 mm. Through setting up the silica gel pad, it both can not break under bearing great pressure, plays waterproof effect to effectively protect the body under the isostatic pressing, effectively improve the yield. In addition, the second plastic bag 6 is a PE bag. The second plastic bag 6 may be disposed in one or more layers, in this embodiment, the second plastic bag 6 is disposed in two layers, and the member to be pressed and the waterproof pad 5 are vacuum-sealed by the second plastic bag 6, so that water can be prevented from entering the product after wet pressing, the product is effectively protected, and the yield is improved.
In step S5, the isostatic pressure ranges from 140Mpa to 170 Mpa. The dwell time for isostatic pressing is 25 to 35 minutes. The pressure of isostatic pressing used in this example was 160Mpa, and the dwell time was 30 minutes.
In step S6, after isostatic pressing, the curved surface of the workpiece 200 does not need to be machined, and only the length and width of the workpiece 200 need to be machined to the designed size.
Compared with the prior art, the dry pressing die 1 is manufactured in advance, and the blank body of the workpiece 200 is formed by powder through the dry pressing die 1, so that the structural shape of the blank body is basically the same as that of the workpiece 200; then, the blank body is subjected to isostatic pressing by the aid of the wet pressing die 2, so that the workpiece 200 can be further accurately pressed from the blank body; therefore, the invention does not need to use CNC for finish machining and material cutting, and has the advantages of very simple and convenient machining and high powder utilization rate. And before isostatic pressing, a winding film 3 is arranged between the wet pressing die 2 and the green body, so that the green body can be prevented from sticking to the die during demoulding, the green body is prevented from being damaged after isostatic pressing, the green body is effectively protected in the processing process, and the yield is high. In addition, before isostatic pressing, the wet pressing mold 2 and the blank body are vacuum-packed together by using a first plastic bag 4, so that the gas in the wet pressing mold can be effectively discharged, the isostatic pressing effect is improved, and the product forming effect is improved; moreover, the processing mode does not need manual polishing of the workpiece 200 again, has high processing efficiency, is beneficial to batch production and has low cost.
The structure of the isostatic press, the specific operation flow of the powder forming and the sintering process involved in the forming method of the workpiece 200 according to the present invention are well known to those skilled in the art, and will not be described in detail herein.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the present invention, which is therefore intended to cover all equivalent changes and modifications within the scope of the present invention.
Claims (10)
1. A method of forming a workpiece, comprising the steps of:
manufacturing a dry pressing die according to the structure of the workpiece, and forming a blank body of the workpiece through powder by using the dry pressing die;
manufacturing a wet pressing die matched with the green body according to the structure of the green body, placing the green body in the wet pressing die, and arranging a winding film between the wet pressing die and the green body;
packaging the wet pressing mold and the blank together by using a first plastic bag, and vacuumizing the interior of the first plastic bag to form a piece to be pressed;
and (3) isostatic pressing the part to be pressed by using an isostatic pressing machine, so that the blank is formed into the workpiece.
2. The workpiece forming method of claim 1, further comprising, before isostatic pressing the member to be pressed, the steps of: and arranging waterproof pads on the surface and the bottom surface of the piece to be pressed, packaging the piece to be pressed and the waterproof pads together by using a second plastic bag, and vacuumizing the interior of the second plastic bag.
3. The method of forming a workpiece according to claim 1, further comprising the step of, after isostatic pressing: and processing and correcting the outer circumference size of the workpiece.
4. The workpiece forming method according to claim 3, further comprising the following step after the machining correction of the outer peripheral dimension of the workpiece: and sintering the workpiece.
5. The workpiece forming method of claim 1, wherein: the dry pressing die comprises an upper die and a lower die, wherein the pressing surface of the lower die is an inverse wave pattern curved surface corresponding to the inner tooth surface of the workpiece, and the pressing surface of the upper die is an arc-shaped curved surface corresponding to the outer side surface of the workpiece.
6. The workpiece forming method of claim 1, wherein: the first plastic bag is a PE bag, and the thickness of the first plastic bag is 0.1 mm.
7. The workpiece forming method of claim 2, wherein: the waterproof pad is a silica gel pad, and the thickness is 1 mm.
8. The workpiece forming method of claim 2, wherein: the second plastic bag is a PE bag.
9. The workpiece forming method of claim 1, wherein: the isostatic pressure ranges from 140Mpa to 170 Mpa.
10. The workpiece forming method of claim 1, wherein: the dwell time for isostatic pressing is 25 to 35 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184497.1A CN114571578A (en) | 2022-02-25 | 2022-02-25 | Workpiece forming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210184497.1A CN114571578A (en) | 2022-02-25 | 2022-02-25 | Workpiece forming method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114571578A true CN114571578A (en) | 2022-06-03 |
Family
ID=81777522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210184497.1A Pending CN114571578A (en) | 2022-02-25 | 2022-02-25 | Workpiece forming method |
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| Country | Link |
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| CN (1) | CN114571578A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201317125Y (en) * | 2008-12-16 | 2009-09-30 | 淄博华创精细陶瓷有限公司 | Novel isostatic pressing shaping die |
| CN103171024A (en) * | 2011-12-20 | 2013-06-26 | 萍乡市金刚科技有限责任公司 | Wear-resisting aluminum oxide ceramic ball isostatic pressing process and special device |
| CN105856387A (en) * | 2015-01-19 | 2016-08-17 | 辽宁爱尔创生物材料有限公司 | Manufacturing method for zirconium dioxide ceramic green-pressing |
| CN106363775A (en) * | 2016-08-29 | 2017-02-01 | 虔东稀土集团股份有限公司 | Ceramic body forming method and device thereof |
| CN111251420A (en) * | 2018-11-30 | 2020-06-09 | 北京小米移动软件有限公司 | Forming die and manufacturing method of 3D ceramic terminal backboard |
| CN113352433A (en) * | 2021-05-26 | 2021-09-07 | 芜湖映日科技股份有限公司 | Packaging method for planar ITO target material cold isostatic pressing |
-
2022
- 2022-02-25 CN CN202210184497.1A patent/CN114571578A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201317125Y (en) * | 2008-12-16 | 2009-09-30 | 淄博华创精细陶瓷有限公司 | Novel isostatic pressing shaping die |
| CN103171024A (en) * | 2011-12-20 | 2013-06-26 | 萍乡市金刚科技有限责任公司 | Wear-resisting aluminum oxide ceramic ball isostatic pressing process and special device |
| CN105856387A (en) * | 2015-01-19 | 2016-08-17 | 辽宁爱尔创生物材料有限公司 | Manufacturing method for zirconium dioxide ceramic green-pressing |
| CN106363775A (en) * | 2016-08-29 | 2017-02-01 | 虔东稀土集团股份有限公司 | Ceramic body forming method and device thereof |
| CN111251420A (en) * | 2018-11-30 | 2020-06-09 | 北京小米移动软件有限公司 | Forming die and manufacturing method of 3D ceramic terminal backboard |
| CN113352433A (en) * | 2021-05-26 | 2021-09-07 | 芜湖映日科技股份有限公司 | Packaging method for planar ITO target material cold isostatic pressing |
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