CN113601278A - Manufacturing method of mirror finishing auxiliary tool of 3D printed piece - Google Patents
Manufacturing method of mirror finishing auxiliary tool of 3D printed piece Download PDFInfo
- Publication number
- CN113601278A CN113601278A CN202110960615.9A CN202110960615A CN113601278A CN 113601278 A CN113601278 A CN 113601278A CN 202110960615 A CN202110960615 A CN 202110960615A CN 113601278 A CN113601278 A CN 113601278A
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- grinding
- auxiliary tool
- tool
- manufacturing
- auxiliary
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000004576 sand Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000010146 3D printing Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 229910001060 Gray iron Inorganic materials 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 239000003350 kerosene Substances 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000008117 stearic acid Substances 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 239000010431 corundum Substances 0.000 claims 1
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 claims 1
- 229910052748 manganese Inorganic materials 0.000 claims 1
- 239000011572 manganese Substances 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 10
- 230000003746 surface roughness Effects 0.000 abstract description 6
- 229910001018 Cast iron Inorganic materials 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 4
- 239000002245 particle Substances 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 235000000421 Lepidium meyenii Nutrition 0.000 description 2
- 240000000759 Lepidium meyenii Species 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 235000012902 lepidium meyenii Nutrition 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000009966 trimming Methods 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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
Abstract
The invention belongs to the technical field of 3D printing, and discloses a manufacturing method of a 3D printing piece mirror surface machining auxiliary tool, which has the following machining principle: the auxiliary tool is three cast iron flat plates, grinding method is used for coating or pressing grinding particles on a grinding tool, finishing processing including coarse grinding, middle grinding and fine grinding is carried out on the processing surface through the relative motion of the grinding tool and the workpiece under certain pressure, and the processing precision can reach IT5-IT 01. The surface roughness can reach less than Ra0.02. After the auxiliary tool meets the requirements of flatness and surface roughness, the fact that ferrite can be embedded into micro powder is utilized in the metallographic structure of cast iron, and sand pressing treatment is carried out.
Description
Technical Field
The invention belongs to the technical field of 3D printing, and relates to the field of manufacturing of auxiliary manufacturing tools for high-precision surface flatness grinding.
Background
3D titanium alloy processing wide application in the aerospace field, the titanium alloy part surface of certain assembly position of novel aircraft needs very high plane degree to avoid the emergence of the condition such as assembly position oil leak, gas leakage. However, in the field of actual machining, an auxiliary manufacturing tool for high-precision surface flatness grinding of titanium alloy materials does not exist, so that the parts can meet the highest requirement on flatness. The processing principle is as follows: the grinding method is used for coating or pressing grinding particles on a grinding tool, and finishing processing is carried out on the processing surface through the relative motion of the grinding tool and the workpiece under certain pressure, and the processing precision can reach IT5-IT 01. The surface roughness can reach less than Ra0.02.
Disclosure of Invention
The invention aims to solve the manufacturing problem of the auxiliary tool for grinding the titanium alloy material of the 3D printing piece. The machining principle of the auxiliary tool is as follows: the auxiliary tools are three cast iron flat plates with the common size of 300 x300, grinding particles coated or embedded on a grinding tool are ground by a grinding method, and finishing processing precision of a processing surface can reach IT5-IT01 by the relative motion of the grinding tool and a workpiece under a certain pressure. The surface roughness can reach less than Ra0.02. After the auxiliary tool meets the requirements of flatness and surface roughness, the fact that ferrite can be embedded into micro powder is utilized by utilizing the metallographic structure of cast iron. And (5) performing sand pressing treatment. The specific technical scheme of the invention is as follows:
first, repair site conditions:
3D print grinding is a high precision manual operation. The tools used must have a high geometric accuracy. Therefore, the environment has direct influence on the grinding quality, and the repair site must have the following conditions:
1. good sealing is needed while avoiding vibration indoors, and negative pressure equipment is needed indoors.
2. The indoor temperature and humidity (the temperature is 20 +/-10 degrees, and the humidity is 50-60 percent) should be kept at a certain value.
II, selecting auxiliary tools: the grinding aid is a reference tool used for grinding work,
the material is as follows: 3.4 to 5 percent of carbon, 2.66 to 4.5 percent of graphite and 0.65 to 2 percent of manganese, and the stress relief method comprises the steps of heating to 550 to 650 ℃ (80 to 120 ℃/h), and cooling with the furnace to below 200 ℃ and discharging.
Thirdly, trimming auxiliary tools:
the processing method comprises coarse grinding, middle grinding and fine grinding, and 3 auxiliary tools can achieve high flatness through the processing.
The invention has the beneficial effects that through the grinding and repairing process of rough grinding, middle grinding and fine grinding, the surface roughness of the auxiliary tool can reach Ra0.02 below, and the planeness is the highest: 0.0005.
drawings
FIG. 1 is a flow chart of the sequence of grinding of No. 1, No. 2 and No. 3 flat plates.
Detailed Description
Mutual grinding was carried out using 3 blocks of 300X 300 gray cast iron auxiliary tools (grinding sequence see FIG. 1)
The grinding can be carried out in three steps
1. Roughly grinding, namely dividing the grinded auxiliary tools into a group of No. 1, No. 2 and No. 3. A first plate is fixed on a grinding frame. The steel grit of M20 was added and a small amount of kerosene was added and spread. Grinding the No. 2 auxiliary tool, and enabling the moving direction to be in an S shape. About 1/3 from the assistant tool. The grinding time is 3-5 minutes. The exercise is regular, 30-40 times per minute. While the direction is to be reversed. 3-5 minutes. When the user looks at the quick grinding dry state, the upper auxiliary tool is taken down. After wiping with cotton, this is as shown in the above figure. 1. And the auxiliary tools 2 and 3 carry out I, II and III circular grinding. The planes of the three auxiliary tools are basically consistent with each other, and the time for the last conversion grinding is generally prolonged to 5-10 minutes. When the grinding mark is completely eliminated, the grinding can be finished by coarse grinding, and the purpose that the grinding mark is not transparent by using the knife edge size inspection is achieved.
2. Carrying out middle research: the coarse grinding process is carried out, except that the finer ground material is replaced. Gradually descending sand numbers by using M14, M10, M7 and M5, and simultaneously adding stearic acid. Thus gradually grinding and polishing; the phenomenon of plane scribing caused by too far distance of the sand reduction number is prevented.
3. Fine grinding: is the most important stage of the grinding auxiliary tool and is used for founding the pressed sand. Therefore, when the auxiliary tool is roughly ground, attention is paid to the temperature change and the influence of dust in the tool. Practical and theoretical can be best demonstrated. When the original auxiliary tool with proper and flat temperature is heated uniformly, the middle part becomes convex. In contrast, if the surface is uniformly cooled, the center becomes concave, which must be noticed by precision grinding and inspection personnel, otherwise time is wasted. The desired results are not obtained, so that the auxiliary tool is finely ground. The grinding time is not long, generally 5-10 minutes, otherwise, the heat quantity is large when the auxiliary tool is held by hands, and deformation is caused. Neither the grinding speed nor the motion amount is more than that of the rough grinding, otherwise the grinding is not dry. When the auxiliary tool is finely ground, the environment needs to be thoroughly cleaned, and the hands only need to be washed. The fine grinding can be carried out only when the circumference is cleaned to be free of dust and coarse sand, so that the surface is prevented from being scratched, and the influence on the lower sand pressing is avoided.
Second, pressing sand
The operation method is the same as that of fine grinding, and the only difference is that micro powder with w2.5 or less is pressed into the gap of the cast iron auxiliary tool, and the surface layer of the grinding auxiliary tool is eliminated by the abrasive grains embedded in the auxiliary tool and the floating abrasive grains in the grinding process. On the other hand, the embedded auxiliary tool surface is embedded to the whole surface of the auxiliary tool in the grinding process, sand is uniformly embedded, and the grinding performance is necessary.
And (4) checking whether the sand pressing is good or bad, firstly, using a test block to test and grind on each part of the auxiliary tool, and not slipping in the test and grinding. When there is grinding noise and white shavings appear on the auxiliary tool. Meanwhile, the test block can reach 12 luminosity. The auxiliary tool is pressed to finish sand pressing, otherwise, the auxiliary tool is continued, and the auxiliary tool pressed with sand is polished by natural oilstone to obtain 18 or 14 grades of luminosity.
Thirdly, polishing by auxiliary tools
Firstly, the flat plate can only reach 11-12 degrees after sand pressing, the size of the flat plate can be roughly ground, but the flat plate needs to be ground to meet the surface luminosity, the grinding is carried out by using extremely fine, hard and flat natural oilstone or maca, the natural oilstone or the maca lightly and uniformly moves on the surface of an auxiliary tool in a circular manner in sequence, and the schematic diagram is as shown in the figure.
The sanding has two functions, firstly, because of the auxiliary tool for pressing the steel grit, the sharp edges of the steel grit are not on the same plane, but are staggered in height. On the other hand, the edges of the sand points can be passivated by grinding, so that the surface of the high block gauge can be smooth, although the grinding performance is reduced. In order to obtain a high level of luminosity in a finished accessory tool, it is necessary to increase the luminosity gradually, so that a 200X300 accessory tool can be divided into three sections, wherein the three luminosity steps are firstly finished on the accessory tool, then finished 2/3 and finally finished 1/3, so that three luminosity values, namely 12, 13 and 14, can be obtained on one accessory tool, and the luminosity values are gradually increased.
Claims (3)
- The manufacturing method of the mirror finishing auxiliary tool of the 3D printing piece is characterized by comprising the following steps:step 1, coarse grinding: dividing the grinded auxiliary tools into No. 1, No. 2 and No. 3 groups; firstly, fixing a No. 1 plate on a grinding frame; placing the M20 corundum, and adding kerosene for uniformly coating; grinding the No. 2 auxiliary tool, wherein the moving direction is in an S shape; about 1/3 from the aid; grinding for 3-5 minutes, and grinding 30-40 times per minute; the direction is changed and the grinding is carried out for 3 to 5 minutes; when the cotton is ground to be dry, the upper auxiliary tool is taken down and the cotton is wiped clean; 1. the auxiliary tools 2 and 3 carry out I, II and III cyclic grinding; three auxiliary tool planes are basically consistent with each other, and the time for the last conversion grinding is generally prolonged to 5-10 minutes; when the grinding marks are completely eliminated, rough grinding is finished, and the purpose that no light transmission exists through the dimension inspection of a knife edge is achieved;grinding in step 2: the same as the coarse grinding method, the grinding materials used are M14, M10, M7 and M5, the number of the sand is gradually decreased, and stearic acid is added; gradually grinding and polishing; the phenomenon of plane scribing caused by too far distance of the sand reduction number is prevented;step 3, fine grinding: adjusting a grinding target according to the temperature state, wherein the grinding time is 5-10 minutes, and the grinding speed and the motion amount are not more than the rough grinding; ensuring that the circumference is free of dust and grit.
- 2. A method for manufacturing an auxiliary tool for 3D printing material mirror finishing according to claim 1, wherein the auxiliary tool is made of: gray cast iron with 3.4-5% of carbon, 2.66-4.5% of graphite, 0.65-2% of manganese and stress relief method of the gray cast iron is heating to 550-650 ℃, heating rate to 80-120 ℃/h, and discharging after furnace cooling below 200 ℃.
- 3. The method for manufacturing a 3D printed matter mirror finishing auxiliary tool according to claim 1, wherein the temperature is kept at 20 ° ± 10 ° and the humidity is kept at 50-60% in the chamber during the whole grinding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110960615.9A CN113601278A (en) | 2021-08-20 | 2021-08-20 | Manufacturing method of mirror finishing auxiliary tool of 3D printed piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110960615.9A CN113601278A (en) | 2021-08-20 | 2021-08-20 | Manufacturing method of mirror finishing auxiliary tool of 3D printed piece |
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| Publication Number | Publication Date |
|---|---|
| CN113601278A true CN113601278A (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110960615.9A Pending CN113601278A (en) | 2021-08-20 | 2021-08-20 | Manufacturing method of mirror finishing auxiliary tool of 3D printed piece |
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| Country | Link |
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| CN (1) | CN113601278A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87202350U (en) * | 1987-02-23 | 1988-07-13 | 福建省计量科学技术研究所 | Hand-operated flat-plate compressed sand grinder |
| CN1039988A (en) * | 1988-07-29 | 1990-02-28 | 谭景春 | The manufacturing of high precision planeness plate |
| CN103501963A (en) * | 2011-05-20 | 2014-01-08 | 株式会社小原 | Method for producing polished product |
| CN104669105A (en) * | 2013-11-26 | 2015-06-03 | 浙江上城科技有限公司 | Two-surface grinding method of sapphire touch panel |
| JP2018192561A (en) * | 2017-05-17 | 2018-12-06 | ファナック株式会社 | Mirror-finishing method, and manufacturing method of mirror-finishing tool |
| CN112059896A (en) * | 2020-09-18 | 2020-12-11 | 中国航发贵州黎阳航空动力有限公司 | Manufacturing method of grinding and sand-pressing platform |
| CN112980331A (en) * | 2019-12-16 | 2021-06-18 | 航天科工惯性技术有限公司 | Precise alloy grinding paste and manual grinding and polishing method |
| CN113174528A (en) * | 2021-04-26 | 2021-07-27 | 泛凯斯特汽车零部件(江苏)有限公司 | Casting made of gray cast iron and manufacturing method thereof |
-
2021
- 2021-08-20 CN CN202110960615.9A patent/CN113601278A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87202350U (en) * | 1987-02-23 | 1988-07-13 | 福建省计量科学技术研究所 | Hand-operated flat-plate compressed sand grinder |
| CN1039988A (en) * | 1988-07-29 | 1990-02-28 | 谭景春 | The manufacturing of high precision planeness plate |
| CN103501963A (en) * | 2011-05-20 | 2014-01-08 | 株式会社小原 | Method for producing polished product |
| CN104669105A (en) * | 2013-11-26 | 2015-06-03 | 浙江上城科技有限公司 | Two-surface grinding method of sapphire touch panel |
| JP2018192561A (en) * | 2017-05-17 | 2018-12-06 | ファナック株式会社 | Mirror-finishing method, and manufacturing method of mirror-finishing tool |
| CN112980331A (en) * | 2019-12-16 | 2021-06-18 | 航天科工惯性技术有限公司 | Precise alloy grinding paste and manual grinding and polishing method |
| CN112059896A (en) * | 2020-09-18 | 2020-12-11 | 中国航发贵州黎阳航空动力有限公司 | Manufacturing method of grinding and sand-pressing platform |
| CN113174528A (en) * | 2021-04-26 | 2021-07-27 | 泛凯斯特汽车零部件(江苏)有限公司 | Casting made of gray cast iron and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 童永华，冯忠伟主编, 北京理工大学出版社 * |
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Application publication date: 20211105 |
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