CN111390769A - Method for removing oxide film and method for repairing oxide film - Google Patents
Method for removing oxide film and method for repairing oxide film Download PDFInfo
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- CN111390769A CN111390769A CN202010236709.7A CN202010236709A CN111390769A CN 111390769 A CN111390769 A CN 111390769A CN 202010236709 A CN202010236709 A CN 202010236709A CN 111390769 A CN111390769 A CN 111390769A
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- metal piece
- oxide film
- sand blasting
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- 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
- B24C1/086—Descaling; Removing coating films
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- 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
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- 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
- B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
- B24B57/02—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents for feeding of fluid, sprayed, pulverised, or liquefied grinding, polishing or lapping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
- B24C7/0046—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier
- B24C7/0053—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier
- B24C7/0061—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a gaseous carrier with control of feed parameters, e.g. feed rate of abrasive material or carrier of feed pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
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- 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
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention relates to a film removing method of an oxide film, which comprises the following steps: placing the metal piece with the poor oxidation film on a hanger; carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece; and taking down the metal piece subjected to sand blasting from the hanger. Meanwhile, the invention also provides a film-removing and repairing method of the oxide film. The invention has the beneficial effects that: place the bad metalwork of oxide film on the hanger, then carry out sand blasting to the surface of metalwork through the sand blasting machine, strike the surface of metalwork through the sand material, make the oxide film on metalwork surface grind off, after the sand blasting with the metalwork from the hanger take off can, strike the oxide film on metalwork surface through the sand material and reach the purpose of moving back the membrane, realize physics and move back the membrane, avoided the use of chemical liquid medicine, reduced the cost of moving back the membrane and solved the problem of water pollution.
Description
Technical Field
The invention relates to the technical field of surface treatment of metal pieces, in particular to a film removing method of an oxide film and a film removing and repairing method of the oxide film.
Background
In the production of products, an oxide film is often formed on the surface of a metal piece through anodic oxidation, and the oxide film can not only protect the surface of the metal piece, but also provide metal colors and enhance the aesthetic property of the products.
After anodic oxidation, defective products sometimes appear, namely the molding of the oxide film on the surface of the metal part is poor, the quality requirement of the product is not met, at the moment, on the premise that the product is not selected to be scrapped, the metal part needs to be deoxidized and repaired, the bad oxide film on the surface of the metal part is removed, and then anodic oxidation is carried out again.
Traditional metal piece deoxidization generally is through chemical liquid medicine soaking to corrode the oxidation film on metal piece surface. The disadvantages are that the maintenance period of the chemical liquid medicine (the time for soaking and using) is short, the chemical liquid medicine needs to be replaced by new chemical liquid medicine regularly, and the cost is high. The use of chemical solutions also presents a problem of water contamination.
Disclosure of Invention
Based on the method, the metal piece with the poor oxidation film is placed on the hanger, sand blasting is conducted on the surface of the metal piece through the sand blasting machine, the surface of the metal piece is impacted through the sand material, the oxidation film on the surface of the metal piece is abraded, the metal piece is taken down from the hanger after sand blasting is conducted, the purpose of removing the oxidation film on the surface of the metal piece is achieved through impact of the sand material, physical film removing is achieved, and chemical liquid medicine is avoided.
A method for removing an oxide film includes the steps of:
placing the metal piece with the poor oxidation film on a hanger;
carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece;
and taking down the metal piece subjected to sand blasting from the hanger.
According to the film removing method for the oxide film, the metal piece with the poor oxide film is placed on the hanger, then sand blasting is conducted on the surface of the metal piece through the sand blasting machine, the surface of the metal piece is impacted through the sand material, the oxide film on the surface of the metal piece is ground off, the metal piece is taken down from the hanger after sand blasting, the oxide film on the surface of the metal piece is impacted through the sand material, the purpose of film removing is achieved, physical film removing is achieved, chemical liquid medicine is avoided being used, the film removing cost is reduced, and the problem of water pollution is solved.
In one embodiment, the grit blasting comprises the steps of:
carrying out front sand blasting treatment on the metal piece through a sand blasting machine;
and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
The oxide film on the surface of the metal piece is removed through front sand blasting and back sand blasting.
In one embodiment, the blasting pressure of the blasting machine is 0.40 ± 0.02 MPA. The sand blasting air pressure of the sand blasting machine is set to be 0.40 +/-0.02 MPA, so that the impact force of the sand material on the metal piece is controlled within a proper range, the oxide film on the surface of the metal piece is eliminated, and meanwhile, the damage to the metal surface below the oxide film is reduced.
In one embodiment, the blasting travel speed of the blasting machine is 4.0 +/-1.0 HZ. The sand blasting walking speed of the sand blasting machine is set to be 4.0 +/-1.0 HZ, so that the sand blasting speed is controlled within a proper range, and the damage to the metal surface below an oxide film is reduced while the oxide film on the surface of the metal piece is eliminated.
Meanwhile, a film removing and repairing method of the oxide film is also provided.
A method for repairing an oxide film by removing the oxide film comprises the following steps:
placing the metal piece with the poor oxidation film on a hanger;
carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece;
taking down the metal piece subjected to sand blasting from the hanger;
polishing the surface of the metal piece after sand blasting, and correcting the surface flatness of the metal piece;
and performing anodic oxidation treatment on the polished metal piece to form a new oxide film on the surface of the metal piece.
According to the film removing and repairing method of the oxide film, the metal piece with the bad oxide film is placed on the hanger, then sand blasting is conducted on the surface of the metal piece through the sand blasting machine, the surface of the metal piece is impacted through the sand material, the oxide film on the surface of the metal piece is ground off, the metal piece is taken down from the hanger after sand blasting is conducted, the purpose of film removing is achieved by impacting the oxide film on the surface of the metal piece through the sand material, physical film removing is achieved, the use of chemical liquid medicine is avoided, the film removing cost is reduced, and the problem of water pollution is solved. And after the film is removed, polishing the surface of the metal piece so as to correct the surface flatness of the metal piece, and then, reforming a new oxide film on the surface of the metal piece through anodic oxidation treatment so as to achieve the purpose of film removal and repair.
In one embodiment, the grit blasting comprises the steps of:
carrying out front sand blasting treatment on the metal piece through a sand blasting machine;
and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
The oxide film on the surface of the metal piece is removed through front sand blasting and back sand blasting.
In one embodiment, the blasting pressure of the blasting machine is 0.40 ± 0.02 MPA. The sand blasting air pressure of the sand blasting machine is set to be 0.40 +/-0.02 MPA, so that the impact force of the sand material on the metal piece is controlled within a proper range, the oxide film on the surface of the metal piece is eliminated, and meanwhile, the damage to the metal surface below the oxide film is reduced.
In one embodiment, the nozzle speed of the sand blasting machine is 4.0 +/-1.0 HZ. The sand blasting walking speed of the sand blasting machine is set to be 4.0 +/-1.0 HZ, so that the sand blasting speed is controlled within a proper range, and the damage to the metal surface below an oxide film is reduced while the oxide film on the surface of the metal piece is eliminated.
In one embodiment, the grinding process comprises the steps of:
roughly polishing the surface of the metal piece by using sponge sand, wherein the polishing time is 120 +/-10 s, and the polishing air pressure is 0.5 +/-0.1 MPA;
performing middle polishing and polishing on the surface of the metal piece by using a stack polishing machine, wherein the polishing time is 160 +/-10 s, the polishing air pressure is 0.35 +/-0.05 MPA, and the rotating speed of a main shaft is 1250 +/-50 PRM;
and (3) carrying out fine polishing and grinding on the surface of the metal piece by using a stack polishing machine, wherein the grinding time is 80 +/-5 s, the grinding air pressure is 0.5 +/-0.1 MPA, and the rotating speed of a main shaft is 1100 +/-100 PRM.
The surface of the metal piece is roughly polished by sponge sand, and then the surface of the metal piece is subjected to middle polishing and fine polishing by a stack polishing machine, so that the flatness of the surface of the metal piece is corrected to the range required by anodic oxidation.
In one embodiment, during the process of fine polishing and grinding the metal piece by the stack polishing machine, polishing liquid is sprayed, and the liquid spraying time is 1.25 +/-0.25 s/die. In the process of fine polishing and grinding, the polishing liquid is sprayed to improve the grinding effect.
Drawings
FIG. 1 is a block diagram of a process for removing an oxide film according to the present invention;
FIG. 2 is a flow chart of a method for repairing an oxide film by removing the oxide film according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Fig. 1 is a block diagram illustrating a process of removing an oxide film according to an embodiment of the present invention.
As shown in fig. 1, the method for removing the oxide film includes the steps of:
s10: and placing the metal piece with the poor oxidation film on a hanger.
Collect the bad metalwork of oxide film and place on the hanger, this hanger sets up for hollow out construction, can place a plurality of metalworks simultaneously, and the metalwork distributes at the hanger evenly at interval.
S20: and carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece.
Traditional chemical liquid medicine moves back the membrane and need eliminate the oxide film on metalwork surface through the mode of soaking, and the chemical liquid medicine that holds in a cell body is after using a period, and the impurity concentration that contains in the chemical liquid medicine can be bigger and bigger to the effect that moves back the membrane can worsen, consequently need regularly change chemical liquid medicine, and the maintenance cycle is short, can produce a large amount of waste water moreover, and waste water then can lead to water pollution if directly discharging, if carry out innocent treatment, then need great cost. Moreover, the use of chemical agents can deteriorate the production environment and pose certain threats to the health of workers. Therefore, in the present invention, the defective oxide film on the surface of the metal material is removed by physical stripping. Specifically, in the present invention, the film removal is achieved using a sand blasting process. In the conventional technology, the sand blasting process is often used to roughen the surface of the metal part, for example, before the conventional anodic oxidation, sand blasting may be performed first according to the requirement of the surface roughness of the anodic oxidation, so that the surface of the metal part with originally higher flatness becomes rough, and the oxide film formed by the anodic oxidation is more stably and tightly attached to the metal surface and is not easy to fall off. In the present invention, the sand blasting is not to roughen the surface of the metal member, but to blast the oxide film on the surface of the metal member with sand to polish off the oxide film. Adopt the sandblast to move back the membrane and not only removed the use of chemical agent from, the sand material can also be retrieved in addition and recycled, is favorable to reduce cost, moreover, has avoided the blowdown problem and the waste water treatment problem of chemical agent waste water. In addition, the effect of polishing that the membrane was moved back in the sandblast can be realized through the working parameter of adjustment sand blasting machine, compares chemical liquid medicine and moves back the membrane, and the controllability is stronger.
In this embodiment, the blasting treatment may include the steps of:
s21: and carrying out front sand blasting treatment on the metal piece through a sand blasting machine.
The metal piece is fixed on the hanger, then the nozzle of the sand blasting machine is used for blasting sand towards the front of the metal piece, and the nozzle not only is used for blasting sand to the front of the metal piece, but also is used for blasting sand to the side face of the metal piece in the process of blasting sand by reciprocating motion.
S22: and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
The hanging tool is turned over by 180 degrees, the metal piece is turned over by 180 degrees along with the hanging tool, then the spray head of the sand blasting machine is used for blasting sand towards the back surface of the metal piece, and the spray head not only performs sand blasting on the back surface of the metal piece, but also performs sand blasting on the side surface of the metal piece in the reciprocating sand blasting process.
The oxide film on the surface of the metal piece is removed through front sand blasting and back sand blasting. It is understood that in other embodiments, the metal member may be subjected to the back blasting treatment before the metal member is subjected to the front blasting treatment, and the same effect may be achieved.
For the parameter setting of the sand blasting machine, the preferred scheme provided in this embodiment is as follows:
in this embodiment, the blasting pressure of the blasting machine is 0.40. + -. 0.02 MPA. The sand blasting air pressure of the sand blasting machine is set to be 0.40 +/-0.02 MPA, so that the impact force of the sand material on the metal piece is controlled within a proper range, the oxide film on the surface of the metal piece is eliminated, and meanwhile, the damage to the metal surface below the oxide film is reduced.
For example, the blast pressure of the blast machine may be set at 0.38MPA, 0.40MPA, 0.42MP, or other values between 0.38MPA and 0.42 MPA.
In the present embodiment, the blasting travel speed of the blasting machine is 4.0 ± 1.0 HZ. The sand blasting walking speed of the sand blasting machine is set to be 4.0 +/-1.0 HZ, so that the sand blasting speed is controlled within a proper range, and the damage to the metal surface below an oxide film is reduced while the oxide film on the surface of the metal piece is eliminated.
For example, the blasting travel speed of the blasting machine may be set to 3.0HZ, 3.5HZ, 4.5HZ, 4.05HZ, or 5.0HZ, or other values between 3.0HZ and 5.0 HZ.
In addition, in this scheme, do not limit to the sand material that the sand blasting machine used, can select various sand materials, in this embodiment, chose the deoxidation microballon as the sand material.
S30: and taking down the metal piece subjected to sand blasting from the hanger.
And after the sand blasting treatment is finished, removing the oxide film on the surface of the metal piece, and taking down the metal piece from the hanger.
According to the film removing method for the oxide film, the metal piece with the poor oxide film is placed on the hanger, then sand blasting is conducted on the surface of the metal piece through the sand blasting machine, the surface of the metal piece is impacted through the sand material, the oxide film on the surface of the metal piece is ground off, the metal piece is taken down from the hanger after sand blasting, the oxide film on the surface of the metal piece is impacted through the sand material, the purpose of film removing is achieved, physical film removing is achieved, chemical liquid medicine is avoided being used, the film removing cost is reduced, and the problem of water pollution is solved.
Fig. 2 is a block flow diagram illustrating a method for repairing an oxide film by removing the oxide film according to an embodiment of the present invention.
As shown in fig. 2, the method for repairing an oxide film by removing the oxide film comprises the following steps:
s10: and placing the metal piece with the poor oxidation film on a hanger.
Collect the bad metalwork of oxide film and place on the hanger, this hanger sets up for hollow out construction, can place a plurality of metalworks simultaneously, and the metalwork distributes at the hanger evenly at interval.
S20: and carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece.
Traditional chemical liquid medicine moves back the membrane and need eliminate the oxide film on metalwork surface through the mode of soaking, and the chemical liquid medicine that holds in a cell body is after using a period, and the impurity concentration that contains in the chemical liquid medicine can be bigger and bigger to the effect that moves back the membrane can worsen, consequently needs the periodic replacement, and the maintenance cycle is short, can produce a large amount of waste water moreover, and waste water if direct discharge then can lead to water pollution, if carry out innocent treatment, then needs great cost. Moreover, the use of chemical agents can deteriorate the production environment and pose certain threats to the health of workers. Therefore, in the present invention, the defective oxide film on the surface of the metal material is removed by physical stripping. Specifically, in the present invention, the film removal is achieved using a sand blasting process. In the conventional technology, the sand blasting process is often used to roughen the surface of the metal part, for example, before the conventional anodic oxidation, sand blasting may be performed first according to the requirement of the surface roughness of the anodic oxidation, so that the surface of the metal part with originally higher flatness becomes rough, and the oxide film formed by the anodic oxidation is more stably and tightly attached to the metal surface and is not easy to fall off. In the present invention, the sand blasting is not to roughen the surface of the metal member, but to blast the oxide film on the surface of the metal member with sand to polish off the oxide film. Adopt the sandblast to move back the membrane and not only removed the use of chemical agent from, the sand material can also be retrieved in addition and recycled, is favorable to reduce cost, moreover, has avoided the blowdown problem and the waste water treatment problem of chemical agent waste water. In addition, the effect of polishing that the membrane was moved back in the sandblast can be realized through the working parameter of adjustment sand blasting machine, compares chemical liquid medicine and moves back the membrane, and the controllability is stronger.
In this embodiment, the blasting treatment may include the steps of:
s21: and carrying out front sand blasting treatment on the metal piece through a sand blasting machine.
The metal piece is fixed on the hanger, then the nozzle of the sand blasting machine is used for blasting sand towards the front of the metal piece, and the nozzle not only is used for blasting sand to the front of the metal piece, but also is used for blasting sand to the side face of the metal piece in the process of blasting sand by reciprocating motion.
S22: and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
The hanging tool is turned over by 180 degrees, the metal piece is turned over by 180 degrees along with the hanging tool, then the spray head of the sand blasting machine is used for blasting sand towards the back surface of the metal piece, and the spray head not only performs sand blasting on the back surface of the metal piece, but also performs sand blasting on the side surface of the metal piece in the reciprocating sand blasting process.
The oxide film on the surface of the metal piece is removed through front sand blasting and back sand blasting. It is understood that in other embodiments, the metal member may be subjected to the back blasting treatment before the metal member is subjected to the front blasting treatment, and the same effect may be achieved.
For the parameter setting of the sand blasting machine, the preferred scheme provided in this embodiment is as follows:
in this embodiment, the blasting pressure of the blasting machine is 0.40. + -. 0.02 MPA. The sand blasting air pressure of the sand blasting machine is set to be 0.40 +/-0.02 MPA, so that the impact force of the sand material on the metal piece is controlled within a proper range, the oxide film on the surface of the metal piece is eliminated, and meanwhile, the damage to the metal surface below the oxide film is reduced.
For example, the blast pressure of the blast machine may be set at 0.38MPA, 0.40MPA, 0.42MP, or other values between 0.38MPA and 0.42 MPA.
In the present embodiment, the blasting travel speed of the blasting machine is 4.0 ± 1.0 HZ. The sand blasting walking speed of the sand blasting machine is set to be 4.0 +/-1.0 HZ, so that the sand blasting speed is controlled within a proper range, and the damage to the metal surface below an oxide film is reduced while the oxide film on the surface of the metal piece is eliminated.
For example, the blasting travel speed of the blasting machine may be set to 3.0HZ, 3.5HZ, 4.5HZ, 4.05HZ, or 5.0HZ, or other values between 3.0HZ and 5.0 HZ.
In addition, in this scheme, do not limit to the sand material that the sand blasting machine used, can select various sand materials, in this embodiment, chose the deoxidation microballon as the sand material.
S30: and taking down the metal piece subjected to sand blasting from the hanger.
And after the sand blasting treatment is finished, removing the oxide film on the surface of the metal piece, and taking down the metal piece from the hanger.
S40: and polishing the surface of the metal piece subjected to sand blasting, and correcting the surface flatness of the metal piece.
After the sand blasting treatment, an oxide film on the surface of the metal piece is removed, meanwhile, the roughness of the surface of the metal piece is increased due to the impact of sand, and at the moment, the flatness of the surface of the metal piece needs to be corrected, so that the process requirement of anodic oxidation again is met.
In the embodiment, in order to reduce the damage to the surface of the metal part and reduce the size influence on the metal part, the flatness of the surface of the metal part is gradually corrected by adopting a progressive mode from rough polishing with lower precision to middle polishing with higher relative precision, and finally, by adopting fine polishing with high precision. Thus, in this embodiment, the grinding process may comprise the steps of:
s41: the surface of the metal piece is roughly ground through sponge sand, the grinding time is 120 +/-10 s, and the grinding air pressure is 0.5 +/-0.1 MPA.
And (3) polishing the surface of the metal piece by using sponge sand with larger roughness, controlling the polishing air pressure to be 0.5 +/-0.1 MPA, and polishing for 120 +/-10 s. Specifically, for the sanding air pressure, it may be 0.4MPA, 0.45MPA, 0.5MPA, 0.55MPA, or 0.6MPA, or other values in 0.5 ± 0.1 MPA. For the sanding duration, it may be 110s, 115s, 120s, 125s, or 130s, or another value within 120 ± 10 s.
In addition, the rough grinding of the sponge sand can also be divided into two steps:
s411: carrying out rough grinding by using No. 400 sponge sand, wherein the grinding time is 60 +/-5 s;
s412: and correcting the sand mark after coarse grinding by using No. 1000 sea sand cotton, wherein the grinding time is 60 +/-5 s.
S42: and (3) performing middle polishing and grinding on the surface of the metal piece by using a stack polishing machine, wherein the grinding time is 160 +/-10 s, the grinding air pressure is 0.35 +/-0.05 MPA, and the rotating speed of a main shaft is 1250 +/-50 PRM.
The surface of the metal piece is further polished by a stack polishing machine with higher polishing precision, the polishing time is 160 +/-10 s, the polishing air pressure is 0.35 +/-0.05 MPA, and the rotating speed of a main shaft is 1250 +/-50 PRM. Specifically, the sanding duration may be 150s, 155s, 160s, 165s, or 170s, or another value within 160s ± 10 s. For the sanding pressure, it may be 0.30MPA, 0.35MPA, or 0.40MPA, or even other values in 0.35MPA + -0.05 MPA. The main shaft rotating speed of the stack polishing machine can be 1200PRM, 1250PRM, 1300PRM or other values in 1250 +/-50 PRM.
S43: and (3) carrying out fine polishing and grinding on the surface of the metal piece by using a stack polishing machine, wherein the grinding time is 80 +/-5 s, the grinding air pressure is 0.5 +/-0.1 MPA, and the rotating speed of a main shaft is 1100 +/-100 PRM.
And (3) performing finer fine polishing and grinding on the surface of the metal piece after the centering and the polishing by using a stack polishing machine, wherein the grinding time is 80 +/-5 s, the grinding air pressure is 0.5 +/-0.1 MPA, and the rotating speed of a main shaft is 1100 +/-100 PRM. Specifically, the sanding duration may be 75s, 80s, or 85s, or another value within 80 ± 5 s. For the sanding pressure, it may be 0.4MPA, 0.5MPA, or 0.6MPA, or other values of 0.5 + -0.1 MPA. The spindle speed may be 1000PRM, 1100PRM, or 1200PRM, or any other value within 1100 + -100 PRM.
The surface of the metal piece is roughly polished by sponge sand, and then the surface of the metal piece is subjected to middle polishing and fine polishing by a stack polishing machine, so that the flatness of the surface of the metal piece is corrected to the range required by anodic oxidation.
In addition, in the process of carrying out fine polishing and grinding on the metal piece by the stack polishing machine, polishing liquid is sprayed, and the liquid spraying time is 1.25 +/-0.25 s/die. In the process of fine polishing and grinding, the polishing liquid is sprayed to improve the grinding effect.
S50: and performing anodic oxidation treatment on the polished metal piece to form a new oxide film on the surface of the metal piece.
After sand blasting and polishing, the bad oxide film on the surface of the metal piece is removed, and the surface flatness of the metal piece is corrected to meet the requirement of secondary anodic oxidation, so that the metal piece is subjected to anodic oxidation treatment, a new oxide film is formed on the surface of the metal piece, and the purpose of oxide film removal and repair is achieved.
According to the film removing and repairing method of the oxide film, the metal piece with the bad oxide film is placed on the hanger, then sand blasting is conducted on the surface of the metal piece through the sand blasting machine, the surface of the metal piece is impacted through the sand material, the oxide film on the surface of the metal piece is ground off, the metal piece is taken down from the hanger after sand blasting is conducted, the purpose of film removing is achieved by impacting the oxide film on the surface of the metal piece through the sand material, physical film removing is achieved, the use of chemical liquid medicine is avoided, the film removing cost is reduced, and the problem of water pollution is solved. And after the film is removed, polishing the surface of the metal piece so as to correct the surface flatness of the metal piece, and then, reforming a new oxide film on the surface of the metal piece through anodic oxidation treatment so as to achieve the purpose of film removal and repair.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for removing an oxide film, comprising the steps of:
placing the metal piece with the poor oxidation film on a hanger;
carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece;
and taking down the metal piece subjected to sand blasting from the hanger.
2. The method for removing an oxide film according to claim 1, wherein the blasting comprises the steps of:
carrying out front sand blasting treatment on the metal piece through a sand blasting machine;
and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
3. The method for removing an oxide film according to claim 1, wherein a blast pressure of the blast machine is 0.40 ± 0.02 MPA.
4. The method for removing an oxide film according to claim 1, wherein a blasting travel speed of the blasting machine is 4.0 ± 1.0 HZ.
5. A method for repairing an oxide film by removing the oxide film is characterized by comprising the following steps:
placing the metal piece with the poor oxidation film on a hanger;
carrying out sand blasting treatment on the surface of the metal piece through a sand blasting machine to eliminate an oxide film on the surface of the metal piece;
taking down the metal piece subjected to sand blasting from the hanger;
polishing the surface of the metal piece after sand blasting, and correcting the surface flatness of the metal piece;
and performing anodic oxidation treatment on the polished metal piece to form a new oxide film on the surface of the metal piece.
6. The method for reworking an oxide film according to claim 5, wherein the blasting comprises the steps of:
carrying out front sand blasting treatment on the metal piece through a sand blasting machine;
and the metal piece is overturned by 180 degrees, and the sand blasting machine is used for carrying out reverse sand blasting treatment on the metal piece.
7. The method for reworking an oxide film according to claim 5, wherein the blasting pressure of the blasting machine is 0.40 ± 0.02 MPA.
8. The method for repairing an oxide film by removing a film thereon according to claim 5, wherein the traveling speed of a blasting machine nozzle is 4.0 ± 1.0 HZ.
9. The method for reworking an oxide film according to claim 5, wherein the polishing treatment comprises the steps of:
roughly polishing the surface of the metal piece by using sponge sand, wherein the polishing time is 120 +/-10 s, and the polishing air pressure is 0.5 +/-0.1 MPA;
performing middle polishing and polishing on the surface of the metal piece by using a stack polishing machine, wherein the polishing time is 160s +/-10 s, the polishing air pressure is 0.35 +/-0.05 MPA, and the rotating speed of a main shaft is 1250 +/-50 PRM;
and (3) carrying out fine polishing and grinding on the surface of the metal piece by using a stack polishing machine, wherein the grinding time is 80 +/-5 s, the grinding air pressure is 0.5 +/-0.1 MPA, and the rotating speed of a main shaft is 1100 +/-100 PRM.
10. The method for repairing an oxide film by removing the oxide film according to claim 9, wherein a polishing solution is sprayed during the finish polishing of the metal member by the stack polishing machine, and the spraying time is 1.25 ± 0.25 s/die.
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Application publication date: 20200710 |