US3293806A - Production of burr free aluminum parts - Google Patents
Production of burr free aluminum parts Download PDFInfo
- Publication number
- US3293806A US3293806A US389186A US38918664A US3293806A US 3293806 A US3293806 A US 3293806A US 389186 A US389186 A US 389186A US 38918664 A US38918664 A US 38918664A US 3293806 A US3293806 A US 3293806A
- Authority
- US
- United States
- Prior art keywords
- burrs
- fragile
- anodizing
- stock
- production
- Prior art date
- 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.)
- Expired - Lifetime
Links
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 title claims description 5
- 238000004519 manufacturing process Methods 0.000 title description 2
- 238000007743 anodising Methods 0.000 claims description 13
- 238000003754 machining Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 description 10
- 238000011282 treatment Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000020030 perry Nutrition 0.000 description 2
- 240000007049 Juglans regia Species 0.000 description 1
- 235000009496 Juglans regia Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 235000020234 walnut Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/083—Deburring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D79/00—Methods, machines, or devices not covered elsewhere, for working metal by removal of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P9/00—Treating or finishing surfaces mechanically, with or without calibrating, primarily to resist wear or impact, e.g. smoothing or roughening turbine blades or bearings; Features of such surfaces not otherwise provided for, their treatment being unspecified
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/12—Anodising more than once, e.g. in different baths
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49995—Shaping one-piece blank by removing material
- Y10T29/49996—Successive distinct removal operations
Definitions
- This invention is concerned with a process for the machining of aluminum parts and is more particularly directed to the problem of producing final parts which are essentially free of burrs which are inevitably raised during machining operations.
- valve bodies for use in automatic transmissions for motor vehicles although the invention is by no means so limited.
- valve bodies are small intricately machined aluminum castings. These castings are heavily machined and must be held to close tolerances. Many of the machined surfaces are located so that cleaning by conventional means such as wire brushing is impracticable.
- This invention is predicated upon the discovery that burrs can be practically eliminated from the finished product if a double anodizing operation is employed.
- the castings as received are given a sand blasting treatment to remove dirt and the casting skin.
- These cleaned castings are given an initial anodizing treatment as the next step.
- This anodizing step is well known to the industry.
- the anodizing is conducted in a sulfuric acid bath at a temperature of 68 of 74 F. at a voltage of 12 volts and a time period of about 20 minutes.
- machining op- 3,293,806- Patented Dec. 27, 1966 erations include the steps of milling, drilling, tapping, reaming, planing and honing. These machining operations raise burrs which are difiicult to remove. However the burrs raised after an anodizing treatment are appreciably harder and more fragile than those raised upon an unanodized article. After the machining operations have been completed, the article is again anodized. This final anodizing treatment renders the raised burrs very hard and brittle.
- the preferred method of finally removing the fragile burrs is to expose the castings to a blast of abrasive particles propelled by a swiftly moving fluid.
- a blast of abrasive particles propelled by a swiftly moving fluid Commercially a shower of ground walnut hulls carried in a stream of air serves very satisfactorily.
- the process of producing a burr free machined aluminum part comprising cleaning the stock from which the part is to be produced, anodizing the stock to produce a brittle surface at least in the areas to be subsequently machined, machining the stock to the final shape of the part whereby fragile burrs are produced, again anodizing the part containing the fragile burrs to further enhance the fragility of the burrs and finally removing the fragile burrs by an abrasive treatment.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Optics & Photonics (AREA)
- Physics & Mathematics (AREA)
- Forging (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
United States Patent 3,293,806 PRODUQTIGN 0F BURR FREE ALUli/HVUM PARTS John B. Holland, Birmingham, Mich, assignor to Ford Motor Company, Dear-horn, Mich, a corporation of Delaware No Drawing. Filed Aug. 12, 1964, Ser. No. 389,186
2 Claims. (Cl. 51320) This invention is concerned with a process for the machining of aluminum parts and is more particularly directed to the problem of producing final parts which are essentially free of burrs which are inevitably raised during machining operations.
This invention has found particular utility in the production of valve bodies for use in automatic transmissions for motor vehicles although the invention is by no means so limited. These valve bodies are small intricately machined aluminum castings. These castings are heavily machined and must be held to close tolerances. Many of the machined surfaces are located so that cleaning by conventional means such as wire brushing is impracticable.
The inherent characteristics of the aluminum casting alloys are such that it is not feasible to do the necessary machining operations without raising many burrs. The presence of these burrs in the finished casting cannot be tolerated because these burrs tend to become detached in service and to contaminate the hydraulic fluid with subsequent disruption of the valve action. These parts have been routinely anodized prior to the final cleaning operation to impart a protective surface to the casting.
This invention is predicated upon the discovery that burrs can be practically eliminated from the finished product if a double anodizing operation is employed. The castings as received are given a sand blasting treatment to remove dirt and the casting skin. These cleaned castings are given an initial anodizing treatment as the next step. This anodizing step is well known to the industry. The anodizing is conducted in a sulfuric acid bath at a temperature of 68 of 74 F. at a voltage of 12 volts and a time period of about 20 minutes. For a further discussion of the technical aspects of the anodizing of aluminum reference may be had to page 1801 of Third Edition of Chemical Engineering Handbook by Perry.
These initially anodized castings are now machined to the required finished dimensions. These machining op- 3,293,806- Patented Dec. 27, 1966 erations include the steps of milling, drilling, tapping, reaming, planing and honing. These machining operations raise burrs which are difiicult to remove. However the burrs raised after an anodizing treatment are appreciably harder and more fragile than those raised upon an unanodized article. After the machining operations have been completed, the article is again anodized. This final anodizing treatment renders the raised burrs very hard and brittle.
The preferred method of finally removing the fragile burrs is to expose the castings to a blast of abrasive particles propelled by a swiftly moving fluid. Commercially a shower of ground walnut hulls carried in a stream of air serves very satisfactorily. Use has also been made of a stream of fine solid abrasive particles such as sand propelled in a stream !of water. This is known as liquid honing. Either of these treatments are capable of removing substantially all of the burrs without extensive resort to tedious and expensive hand operations.
I claim as my invention:
1. The process of producing a burr free machined aluminum part comprising cleaning the stock from which the part is to be produced, anodizing the stock to produce a brittle surface at least in the areas to be subsequently machined, machining the stock to the final shape of the part whereby fragile burrs are produced, again anodizing the part containing the fragile burrs to further enhance the fragility of the burrs and finally removing the fragile burrs by an abrasive treatment.
2. The process of producing a burr free machined aluminum part comprising cleaning the stock from which the part is to be produced, anodizing the stock to produce a brittle surface at least in the areas to be subsequently machined, machining the stock to the final shape of the part whereby fragile burrs are produced, again anodizing the part containing the fragile burrs to further enhance the fragility of the burrs and finally removing the fragile burrs.
References Cited by the Examiner UNITED STATES PATENTS 2,040,715 5/1936 Smith 51-321 2,421,806 6/1947 Perry 51-320 LESTER M. SWINGLE, Primary Examiner.
Claims (1)
- 2. THE PROCESS OF PRODUCING A BURR FREE MACHINED ALUMINUM PART COMPRISING CLEANING THE STOCK FROM WHICH THE PART IS TO BE PRODUCED, ANODIZING THE STOCK TO PRODUCE A BRITTLE SURFACE AT LEAST IN THE AREA TO BE SUBSEQUENTLY MACHINED, MACHINING THE STOCK TO THE FINAL SHAPED OF THE PART WHEREBY FRAGILE BURRS ARE PRODUCED, AGAIN ANODIZING THE PART CONTAINING THE FRAGILE BURRS TO FURTHER ENHANCE THE FRAGILITY OF THE BURRS AND FINALLY REMOVING THE FRAGILE BURRS.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US389186A US3293806A (en) | 1964-08-12 | 1964-08-12 | Production of burr free aluminum parts |
| GB22482/65A GB1036554A (en) | 1964-08-12 | 1965-05-26 | Method of producing a machined metal member free from burrs |
| DE19651527544 DE1527544A1 (en) | 1964-08-12 | 1965-06-18 | Process for the production of burr-free aluminum parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US389186A US3293806A (en) | 1964-08-12 | 1964-08-12 | Production of burr free aluminum parts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3293806A true US3293806A (en) | 1966-12-27 |
Family
ID=23537208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US389186A Expired - Lifetime US3293806A (en) | 1964-08-12 | 1964-08-12 | Production of burr free aluminum parts |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3293806A (en) |
| DE (1) | DE1527544A1 (en) |
| GB (1) | GB1036554A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017009700A1 (en) | 2015-07-16 | 2017-01-19 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| CN112720274A (en) * | 2021-01-14 | 2021-04-30 | 辽宁融达新材料科技有限公司 | Treatment method for uneven surface color of foamed aluminum |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2040715A (en) * | 1935-06-10 | 1936-05-12 | Elmo V Smith | Liquid blasting |
| US2421806A (en) * | 1944-04-14 | 1947-06-10 | Turco Products Inc | Cleaning method and material therefor |
-
1964
- 1964-08-12 US US389186A patent/US3293806A/en not_active Expired - Lifetime
-
1965
- 1965-05-26 GB GB22482/65A patent/GB1036554A/en not_active Expired
- 1965-06-18 DE DE19651527544 patent/DE1527544A1/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2040715A (en) * | 1935-06-10 | 1936-05-12 | Elmo V Smith | Liquid blasting |
| US2421806A (en) * | 1944-04-14 | 1947-06-10 | Turco Products Inc | Cleaning method and material therefor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017009700A1 (en) | 2015-07-16 | 2017-01-19 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| EP3322842A4 (en) * | 2015-07-16 | 2018-08-08 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| US10060043B2 (en) | 2015-07-16 | 2018-08-28 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| EP3903995A3 (en) * | 2015-07-16 | 2022-01-26 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| US12359336B2 (en) | 2015-07-16 | 2025-07-15 | Raytheon Canada Limited | Forming an article made of metal matrix composite |
| CN112720274A (en) * | 2021-01-14 | 2021-04-30 | 辽宁融达新材料科技有限公司 | Treatment method for uneven surface color of foamed aluminum |
Also Published As
| Publication number | Publication date |
|---|---|
| GB1036554A (en) | 1966-07-20 |
| DE1527544A1 (en) | 1969-09-11 |
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