CN112626529A - Method for cleaning inner hole of tubular nut - Google Patents
Method for cleaning inner hole of tubular nut Download PDFInfo
- Publication number
- CN112626529A CN112626529A CN202011393216.0A CN202011393216A CN112626529A CN 112626529 A CN112626529 A CN 112626529A CN 202011393216 A CN202011393216 A CN 202011393216A CN 112626529 A CN112626529 A CN 112626529A
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- China
- Prior art keywords
- electroplating
- wall
- degreasing
- cleaning
- parts
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004140 cleaning Methods 0.000 title claims abstract description 12
- 238000009713 electroplating Methods 0.000 claims abstract description 24
- 238000005238 degreasing Methods 0.000 claims abstract description 22
- 238000005119 centrifugation Methods 0.000 claims abstract description 13
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 6
- 238000001994 activation Methods 0.000 claims abstract description 6
- 230000004913 activation Effects 0.000 claims abstract description 6
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 11
- 239000003814 drug Substances 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 230000003749 cleanliness Effects 0.000 abstract description 11
- 239000002245 particle Substances 0.000 abstract description 6
- 239000000565 sealant Substances 0.000 abstract description 6
- 230000002950 deficient Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000004018 waxing Methods 0.000 description 2
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/06—Filtering particles other than ions
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/08—Drying solid materials or objects by processes not involving the application of heat by centrifugal treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention discloses a method for cleaning an inner hole of a tubular nut, which comprises the following steps of firstly, sequentially carrying out pretreatment, hot alkali degreasing, electrolytic degreasing, acid washing, electrolytic degreasing, activation and electroplating on parts; in the electroplating process, the thickness of the part is controlled to be at the lower limit of the part requirement on the premise of ensuring the salt spray requirement of the part; filtering the parts in the electroplating bath by using a filter; and then, centrifugally drying the electroplated part, wherein the centrifugal direction is forward and reverse bidirectional centrifugation and inclined centrifugation. The invention effectively improves the cleanliness of the inner wall of the part and greatly reduces the proportion of particles with the inner wall more than 0.1 mm; and the proportion of the sealant accumulated in the inner wall of the part or the blind hole is reduced, the cleanliness of the inner wall or the blind hole is improved, and the generation of defective products is reduced by over 80 percent.
Description
Technical Field
The invention relates to the technical field of tubular nuts or sleeve parts which need surface alloy electroplating for corrosion prevention and have a requirement on the cleanness of an inner wall, in particular to a method for cleaning an inner hole of a tubular nut.
Background
For tubular nuts or sleeves, special cleanliness requirements can be sometimes required for parts, strict control requirements can be made for impurity particles on the surfaces of the electroplated parts, but burrs are easily generated in the electroplating process or sealing agent accumulation and other phenomena are generated in the sealing process due to the lack of mutual friction of the inner walls of the tubular parts, so that the cleanliness requirements of the parts are influenced.
The production line pretreatment process adopted at present: hot alkali degreasing, acid washing, electrolytic degreasing, activation, and electroplating. But the effect of the actual finished product is not ideal, and the inner wall of some parts has the phenomenon of dirty and unclean oil cleaning, so that the bonding force of the inner wall is poor, and the phenomenon of falling of the inner wall coating is generated. In the electroplating process, a plurality of impurity particles such as zinc slag, scale oxide slag, part leftover materials and the like are brought when different parts are produced, and a filter with proper tonnage needs to be selected for continuous filtration during production.
The filter used in the current electroplating bath is a filter element with 10 meshes, and granular dirt (such as the inner wall shown in the formula I) is still found to be attached to the inner wall of part after electroplating, and the bad proportion of the sampling inspection is as high as about 50%. For parts with sealing requirements, the cleanness of sealing liquid medicine is determined before sealing, and the influence of particle impurities and condensed suspended matters in the liquid medicine on the cleanliness of the inner wall is avoided. Secondly, a proper centrifugal process is selected, if a right-angle step (shown as (II)) is arranged in the middle of the inner wall of the part, a common unidirectional centrifugal process is adopted during production, the centrifugal speed is 300r/min, the centrifugal direction is unidirectional centrifugation, so that the sealant of part of the part at the step cannot be completely thrown clean, sealant accumulation is formed after drying, the cleanliness of the inner wall is influenced, and the sealant accumulation reject ratio is about 30% by sampling inspection.
Disclosure of Invention
In order to solve the technical problem, the invention provides an inner hole cleaning method of a tubular nut, which comprises the following steps
Firstly, sequentially carrying out pretreatment, hot alkali degreasing, electrolytic degreasing, acid washing, electrolytic degreasing, activation and electroplating on parts;
in the electroplating process, the thickness of the part is controlled to be at the lower limit of the part requirement on the premise of ensuring the salt spray requirement of the part; filtering the parts in the electroplating bath by using a filter;
and then, centrifugally drying the electroplated part, wherein the centrifugal direction is forward and reverse bidirectional centrifugation and inclined centrifugation.
Furthermore, the hot alkali oil removal temperature is 60-70 ℃, and the oil removal concentration is the middle upper limit of the required range of the liquid medicine.
Furthermore, the electrolytic degreasing temperature is 60-70 ℃, and the degreasing concentration is the middle upper limit of the required range of the liquid medicine.
Furthermore, trivalent white zinc is adopted for electroplating, and the thickness is 8-15 um.
The invention effectively improves the cleanliness of the inner wall of the part and greatly reduces the proportion of particles with the inner wall more than 0.1 mm. And the proportion of the sealant accumulated in the inner wall of the part or the blind hole is effectively reduced, the cleanliness of the inner wall or the blind hole is improved, and the generation of defective products is reduced by over 80 percent.
Drawings
Fig. 1 is a background art diagram.
Detailed Description
The method for cleaning the inner hole of the tubular nut comprises the following steps of firstly, sequentially carrying out pretreatment, hot-alkali oil removal, electrolytic oil removal, acid cleaning, electrolytic oil removal, activation and electroplating on parts. The pretreatment adopts two hot dipping degreasing steps, the hot alkali degreasing temperature is controlled to be 60-70 ℃, the degreasing concentration is controlled to be the middle upper limit of the liquid medicine required range, good degreasing effect is obtained, and the oil stain on the inner wall is removed completely. And after oil removal, one anode electrolysis oil removal is added, the electrolysis oil removal temperature is controlled to be 60-70 ℃, the oil removal concentration is the middle upper limit of the liquid medicine required range, the electrolysis oil removal has a better oil removal effect than hot immersion oil removal, and oil stains on the inner walls of the inner hole piece and the blind hole piece are effectively removed.
In the electroplating process, the thickness of the part is controlled to be at the lower limit of the part requirement on the premise of ensuring the salt spray requirement of the part; and filtering the parts in the electroplating bath by using a filter. Electroplating trivalent white zinc with the thickness of 8-15um, controlling the thickness to produce at the middle and lower limits on the premise of ensuring the salt spray requirement, and avoiding the phenomenon that the generated coating falls off to influence the cleanliness of the inner wall due to the over-thick thickness of the high area of the edge current.
And then, centrifugally drying the electroplated part, wherein the centrifugal direction is forward and reverse bidirectional centrifugation and inclined centrifugation.
And a waxing process is adopted in the next step, the wax liquid is guaranteed to be clean during waxing, the influence on the cleanliness caused by the fact that particles or suspended matters in the wax liquid are attached to the inner wall of the part is avoided, the centrifugal drying speed of the wax liquid is 250-one 330r/min, and a bidirectional centrifugation or inclined centrifugation process can be adopted to guarantee that the sealant on the inner wall is completely removed.
Example (b):
the method comprises the steps of pretreatment of parts, hot alkali degreasing, electrolytic degreasing, acid washing, electrolytic degreasing, activation and electroplating. In the aspect of oil removal, one anode electrolysis oil removal is added, so that the oil stain in the inner hole is ensured to be completely treated, the binding force of the inner wall is not influenced, and the risk of influencing the binding force due to the falling of the plating layer is avoided.
In the electroplating process, the control of the thickness of the part needs to be paid attention to, and the thickness is controlled to be the lower limit required by the part as far as possible on the premise of ensuring the salt spray requirement of the part, for example, the thickness required by the part is as follows: 8-15um, salt spray: the 72H has no white rust, so that the influence of the thickness on a salt fog field can be determined to be small, the production can be carried out by controlling the thickness to be 8-12um during production, and the problem that the cleanliness of the inner wall of a part is influenced by zinc dross after the zinc dross falls off due to the fact that the thickness of a high current area at the corner of the part is too thick is avoided. The filter element of the filter in the electroplating bath is a 5-mesh filter element, and the reject ratio of the selective inspection is reduced to below 1 percent.
And then, centrifugally drying the electroplated part. For parts with sealing requirements, during sealing treatment, the centrifugal speed is 330r/min, the centrifugal direction is forward and reverse bidirectional centrifugation, and once part inclined centrifugation is added, so that the parts can be better rotated, the step position of the inner wall of each part can be completely thrown, and the bad proportion of the parts is reduced to below 5%.
Claims (4)
1. The method for cleaning the inner hole of the tubular nut is characterized by comprising the following steps of:
firstly, sequentially carrying out pretreatment, hot alkali degreasing, electrolytic degreasing, acid washing, electrolytic degreasing, activation and electroplating on parts;
in the electroplating process, the thickness of the part is controlled to be at the lower limit of the part requirement on the premise of ensuring the salt spray requirement of the part; filtering the parts in the electroplating bath by using a filter;
and then, centrifugally drying the electroplated part, wherein the centrifugal direction is forward and reverse bidirectional centrifugation and inclined centrifugation.
2. A method of cleaning an internal bore of a tubular nut as defined in claim 1, wherein: the hot alkali oil removal temperature is 60-70 ℃, and the oil removal concentration is the middle upper limit of the required range of the liquid medicine.
3. A method of cleaning an internal bore of a tubular nut as defined in claim 1, wherein: the electrolytic degreasing temperature is 60-70 ℃, and the degreasing concentration is the middle upper limit of the required range of the liquid medicine.
4. A method of cleaning an internal bore of a tubular nut as defined in claim 1, wherein: trivalent white zinc is adopted for electroplating, and the thickness is 8-15 um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011393216.0A CN112626529A (en) | 2020-12-03 | 2020-12-03 | Method for cleaning inner hole of tubular nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011393216.0A CN112626529A (en) | 2020-12-03 | 2020-12-03 | Method for cleaning inner hole of tubular nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112626529A true CN112626529A (en) | 2021-04-09 |
Family
ID=75307439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011393216.0A Pending CN112626529A (en) | 2020-12-03 | 2020-12-03 | Method for cleaning inner hole of tubular nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112626529A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572894A (en) * | 2022-09-08 | 2023-01-06 | 衢州垣发机械有限公司 | Inner tube of automobile friction shock absorber and preparation process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372701A (en) * | 1986-12-30 | 1994-12-13 | Gerdon; Louis J. | Process and apparatus for electroplating |
| CN2458445Y (en) * | 2001-01-08 | 2001-11-07 | 顾建军 | Centrifugal bidirectional wind wheel |
| CN109537009A (en) * | 2018-12-29 | 2019-03-29 | 南通申海工业科技有限公司 | The plating of lug nut depth blind hole applies technique |
-
2020
- 2020-12-03 CN CN202011393216.0A patent/CN112626529A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5372701A (en) * | 1986-12-30 | 1994-12-13 | Gerdon; Louis J. | Process and apparatus for electroplating |
| CN2458445Y (en) * | 2001-01-08 | 2001-11-07 | 顾建军 | Centrifugal bidirectional wind wheel |
| CN109537009A (en) * | 2018-12-29 | 2019-03-29 | 南通申海工业科技有限公司 | The plating of lug nut depth blind hole applies technique |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115572894A (en) * | 2022-09-08 | 2023-01-06 | 衢州垣发机械有限公司 | Inner tube of automobile friction shock absorber and preparation process thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210409 |
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| RJ01 | Rejection of invention patent application after publication |