CN110453212B

CN110453212B - Method for thermally coloring surface of copper workpiece

Info

Publication number: CN110453212B
Application number: CN201910785224.0A
Authority: CN
Inventors: 王声华; 李志强; 汤鑫超
Original assignee: Xiamen Jiajiada Machinery Co ltd
Current assignee: Xiamen Jiajiada Machinery Co ltd
Priority date: 2019-08-23
Filing date: 2019-08-23
Publication date: 2021-05-04
Anticipated expiration: 2039-08-23
Also published as: CN110453212A

Abstract

The invention discloses a copper workpiece surface thermal coloring method, which adopts the technical scheme that the method comprises the following steps: step 1, polishing the surface of a workpiece; step 2, hanging a hanger on the workpiece to soak the medicine: removing oil from the workpiece, and soaking the hanger in a metal oil removing agent solution; soaking a workpiece, namely soaking a hanger in a soaking solution containing basic copper carbonate and ammonia water, and then cleaning with flowing water; fixing the color of a workpiece, namely soaking a hanger in a color fixing solution containing copper nitrate, and then cleaning with flowing water; cleaning with hot water, namely soaking the hanger in hot water at 80-90 ℃; step 3, glowing catalysis of a hanging tool below the workpiece; step 4, waxing the surface of the workpiece; and 5, wiping the surface of the workpiece. The invention has the effects of processing the copper workpieces by streamlined thermal coloring and shortening the processing time of a single workpiece.

Description

Method for thermally coloring surface of copper workpiece

Technical Field

The invention relates to a metal surface treatment method, in particular to a copper workpiece surface thermal coloring method.

Background

The traditional or ancient bronze coloring method mostly adopts a cold coloring method or a natural coloring method. The method is to place the copper part outdoors or buried in the earth and add some formulation to slowly cause the color change on the surface. While bronze chemical tinting is more common today. BRONZE chemical coloring (BRONZE PATINA), also known as BRONZE chemical heat coloring in China, is to promote chemical reaction between a compound and the surface of BRONZE by using heating as a catalyst so as to naturally produce various colors, thereby achieving the effect of decorating the surface of BRONZE.

At present, the surface hot coloring process of bronze is mainly used for coloring the outer surface of the bronze sculpture, so that the hot coloring process is long in integral time and is not suitable for carrying out hot coloring treatment on a large number of copper workpieces in a factory.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a method for thermally coloring the surface of a copper workpiece, which has the advantages of streamlined thermal coloring processing of the copper workpiece and shortening the processing time of a single workpiece.

In order to achieve the purpose, the invention provides the following technical scheme: a method for thermally coloring the surface of a copper workpiece comprises the following steps:

step 1, polishing the surface of a workpiece;

step 2, hanging a hanger on the workpiece to soak the medicine:

removing oil from the workpiece, and soaking the hanger in a metal oil removing agent solution;

soaking a workpiece, namely soaking a hanger in a soaking solution containing basic copper carbonate and ammonia water, and then cleaning with flowing water;

fixing the color of a workpiece, namely soaking a hanger in a color fixing solution containing copper nitrate, and then cleaning with flowing water;

cleaning with hot water, namely soaking the hanger in hot water at 80-90 ℃;

step 3, glowing catalysis of a hanging tool below the workpiece;

step 4, waxing the surface of the workpiece;

and 5, wiping the surface of the workpiece.

By adopting the technical scheme, the surface of the workpiece is polished to remove an oxide film on the surface of the workpiece; and then, a plurality of polished workpieces are hung on the hanger together, so that the workpieces are soaked in the chemicals simultaneously, and the workpiece processing efficiency is improved. The hanger soaks and makes the work piece on the pendant together deoil in the metal degreaser, soaks and tentatively colors for the work piece on the pendant together in the color dip liquid to wash totally through flowing water, soak and guarantee that the colour is firm and wash totally through flowing water for the work piece on the pendant in the fixation liquid, hot water washing accelerates the colour solidification on the work piece. The workpiece is burnt to catalyze, completely remove the moisture on the workpiece and simultaneously solidify the color. And the workpiece is protected by waxing, and the production of the workpiece is finished after wiping.

In conclusion, the scheme is characterized in that the production of the workpieces is realized in a step mode, corresponding steps which are convenient for industrialization, simplicity and industrial operation are specified, meanwhile, some workpieces are independently subjected to time-consuming steps, and a plurality of workpieces are synchronously processed. Therefore, the streamlined processing of the thermal coloring of the copper workpiece is realized, and the processing time of a single workpiece is greatly shortened.

The invention is further configured to: still include between work piece deoiling and the work piece color infusion:

and (3) dezincing and corroding the workpiece, soaking the workpiece in a copper chloride solution with the concentration of 18-20 g/L, and then cleaning with flowing water.

By adopting the technical scheme, zinc components exist in a workpiece made of copper generally, and the workpiece is soaked in a copper chloride solution to replace the zinc on the surface of the workpiece, so that the subsequent color soaking effect is improved.

The invention is further configured to: and a rotary hanging point for hanging the hanging tool is arranged above the color fixing liquid.

Through adopting above-mentioned technical scheme, hanging at rotatory hanging point when the hanger, can rotate under the drive of rotatory hanging point to realize abundant contact reaction between work piece and the fixation, when accelerating reaction rate, be the work piece fixation comprehensively.

The invention is further configured to: the color leaching solution is a mixed solution of 80-120 g/L basic copper carbonate and 800-900 g/L ammonia water, and the pH value of the mixed solution is 9.5-10.5;

the color fixing solution is a copper nitrate solution with the concentration of 60-70 g/L and the pH value of 3-4.

Through adopting above-mentioned technical scheme, the dip-coloring liquid in the scheme can dye black for the work piece fast, and the fixation can solidify black for black is firm on the work piece.

The invention is further configured to: the workpiece is soaked in the color soaking liquid for 50-70 seconds, and the color fixing liquid is soaked for 40-60 seconds.

By adopting the technical scheme, the soaking time of the color-soaking liquid is 50-70 seconds, the soaking time of the color-fixing liquid is 40-60 seconds, which is a proper soaking time, if the soaking time of the workpiece is too short, stable coloring cannot be achieved, and if the soaking time is too long, the production efficiency is affected.

The invention is further configured to: the flowing water cleaning device comprises a first water tank, a second water tank and a third water tank, wherein workpieces sequentially pass through the first water tank, the second water tank and the third water tank, and a flowing water source is arranged above the third water tank and sequentially enters the third water tank, the second water tank and the first water tank.

By adopting the technical scheme, the workpiece sequentially passes through the first water tank, the second water tank and the third water tank, so that the impurity content in the first water tank, the second water tank and the third water tank is sequentially reduced; the flowing water source sequentially enters a third water tank, a second water tank and the first water tank, water in the third water tank enters the second water tank, and water in the second water tank can play a role in diluting when entering the first water tank; therefore, the multi-stage cleaning of the workpiece is realized through one flowing water source, and the workpiece is cleaned up.

The invention is further configured to: the step 1 comprises the following steps:

uniformly blasting sand according to the shape of the workpiece, wherein the fineness of the blasting sand is more than or equal to 150 meshes;

and blowing off sand powder on the surface of the workpiece by using an air gun.

By adopting the technical scheme, the workpiece is subjected to sand blasting, and the fineness of sand powder can be controlled by sand blasting with the fineness of more than or equal to 150 meshes so as to quickly and uniformly remove the oxide film on the surface of the workpiece. And after the sand blasting is finished, the sand powder on the workpiece can be quickly cleaned through the air gun.

The invention is further configured to: the step 3 comprises the following steps:

placing a workpiece on an iron plate, and then placing the iron plate on a processing rotating table;

and (3) firing the surface of the workpiece by using a gas spray gun, and controlling the temperature to be 350-400 ℃ by using an infrared thermometer in the firing process, wherein the firing time is 140-180 seconds.

By adopting the technical scheme, the burning temperature of the workpiece can not be too high, and the workpiece can not be locally burned for a long time, so that the workpiece is placed on the rotary table and placed on the processing rotary table, the burning time of the workpiece on the rotary table is almost the same, the workpiece can be accurately controlled between 350-400 ℃ through the control of the infrared thermometer, and the workpiece can be ensured to be completely changed into metal black when the surface moisture is removed.

The invention is further configured to: and 4, waxing when the surface temperature of the workpiece is reduced to 50-60 ℃.

By adopting the technical scheme, the workpiece is waxed at 50-60 ℃, the wax has good adhesive capacity, and is not easy to fall off after being waxed.

The invention is further configured to: and 5, wiping the surface of the workpiece by using a steel wire ball.

By adopting the technical scheme, when the steel wire balls uniformly wipe the surface of the workpiece, the workpiece surface can be slightly exposed, and the attractiveness of the workpiece is improved.

In summary, the invention has the following advantages:

1. the surface of the copper workpiece is thermally colored to be processed in a streamlined manner, so that the processing time of the copper workpiece is greatly shortened;

2. coloring the surface of a copper workpiece quickly by using the processes of color soaking, color fixing, hot water cleaning and hot air drying;

3. the glowing catalysis is controlled by an infrared thermometer, so that the stability of the glowing catalysis process effect is ensured.

Drawings

FIG. 1 is a schematic structural view of a manganese bronze handle in the present embodiment;

fig. 2 is a schematic flow chart of the present embodiment.

Description of reference numerals: 1. manganese bronze handle.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In the present embodiment, a surface thermal coloring method of a copper workpiece is taken as an example, as shown in fig. 1, in which a manganese bronze handle 1 having a high hardness is selected as an example.

As shown in fig. 2, the surface hot coloring method of the manganese bronze handle 1 includes:

step 1, polishing the surface of a workpiece;

1.1, blasting sand on the workpiece, namely putting the manganese bronze handle 1 into a sand blasting machine for blasting sand on the surface by using 150-mesh quartz sand.

Specifically, during sandblasting, uniform sandblasting is carried out according to the shape of the handle, in addition, the proper spraying distance and angle between the spray gun and the manganese bronze handle 1 are required to be kept, the spray gun and the workpiece are required to move relatively, the surface of the workpiece is subjected to the spraying processing of the abrasive, and the oxide film on the surface of the manganese bronze handle 1 is removed; in the embodiment, the sand blasting pressure is 6kg/cm, and the spraying distance is 5-8 cm.

1.2, removing sand by using an air gun, taking the manganese bronze handle 1 out of the sand blasting machine, and blowing off sand powder on the surface of the manganese bronze handle 1 by using the air gun.

Specifically, the sand powder covering the surface of the workpiece may be shaken off before the air gun is used. The compressed gas was confirmed to be free of moisture or oil contamination between air guns.

Step 2, hanging a hanger on the workpiece to soak the medicine:

2.1 hanging the four manganese bronze handles 1 with the processed surfaces on a hanger.

Specifically, the structure of the hanger is designed according to different workpieces. Generally, the hanger needs to include the peg, set up couple and the interval in the peg upper end sets up in a plurality of hangers of peg downside, and the hangers is along the circumference and the radial evenly distributed of peg, supplies the work piece to place. The manganese bronze handle 1 is fixedly connected with the hanger, so that the manganese bronze handle 1 is not easy to fall out, and the manganese bronze handle 1 is arranged at intervals to ensure that the manganese bronze handle 1 does not collide with each other.

2.2 removing oil on the surface, and soaking the hanger with the manganese bronze handle 1 in the metal oil removing agent solution.

2.3, removing zinc and corroding the surface, and soaking the hanger with the manganese bronze handle 1 in a copper chloride solution with the concentration of 18-20 g/L;

specifically, a rotary hanging point for hanging the hanging tool is arranged above the copper chloride solution. The hook of the hanger is hung on the rotary hanging point and is driven by the rotary hanging point to rotate, so that the manganese bronze handle 1 is soaked in the copper chloride solution completely. The manganese bronze has a large amount of zinc components, and the zinc elements and the copper chloride solution are subjected to comprehensive replacement reaction to remove the zinc elements on the surface of the manganese bronze handle 1.

2.4 flowing water is used for cleaning, and the first water tank, the second water tank and the third water tank are used for sequentially soaking the hanger, so that the hanger and the copper chloride on the surface of the manganese bronze handle 1 are cleaned.

Specifically, a flowing water source is arranged above the third water tank, and water flowing out of the flowing water source sequentially enters the third water tank, the second water tank and the first water tank. The rack is used for sequentially soaking the first water tank, the second water tank and the third water tank, so that the impurity content in the first water tank, the second water tank and the third water tank is sequentially reduced; the flowing water source sequentially enters a third water tank, a second water tank and the first water tank, water in the third water tank enters the second water tank, and water in the second water tank can play a role in diluting when entering the first water tank; therefore, the multi-stage cleaning of the workpiece is realized through one flowing water source, and the workpiece is cleaned up.

2.5, surface coloring, namely soaking the hanger with the manganese bronze handle 1 in a coloring solution containing basic copper carbonate and ammonia water.

Specifically, the manganese bronze handle 1 is dipped in a mixed solution of 80-120 g/L basic copper carbonate and 800-900 g/L ammonia water, wherein the mixed solution has a pH value of 9.5-10.5, and the dipping time is 50-70 seconds, so that the surface of the manganese bronze handle 1 is blackened.

2.6 washing with flowing water, namely sequentially soaking the hanger in a first water tank, a second water tank and a third water tank, and washing the hanger and the color soaking liquid on the surface of the manganese bronze handle 1.

2.7, fixing the color on the surface, and soaking the hanger with the manganese bronze handle 1 in a color fixing solution containing copper nitrate.

Specifically, a rotary hanging point for hanging the hanging tool is arranged above the color fixing liquid. The hanger hook is hung on the rotary hanging point and is driven by the rotary hanging point to rotate, so that the manganese bronze handle 1 on the hanger is soaked in the color fixing liquid comprehensively. The fixation solution for manganese bronze handle 1 color immersion is a copper nitrate solution with the concentration of 60-70 g/L and the pH value of 3-4, the time for immersing the fixation solution is 40-60 seconds, and the color of the manganese bronze handle 1 can be further deepened.

2.8 flowing water is used for cleaning, and the first water tank, the second water tank and the third water tank which are used for soaking the hanger in sequence are used for cleaning the color fixing liquid on the surfaces of the hanger and the manganese bronze handle 1.

2.9, cleaning with hot water, and soaking the hanger in hot water at 80-90 ℃ to accelerate the color curing of the surface of the workpiece.

And 3, glowing and catalyzing the hanger below the workpiece.

3.1, hot air drying, namely sequentially taking the manganese bronze handle 1 down from a hanger, and performing hot air drying on the surface of the manganese bronze handle 1 by using an air gun;

3.2 placing a workpiece, placing the manganese bronze handle 1 on an iron plate, and then placing the iron plate on a processing rotating table;

specifically, the number of the manganese bronze handles 1 placed on the iron plate is approximately 6, a gap of about 5mm is formed between every two adjacent manganese bronze handles 1 when the manganese bronze handles are placed, and the linear speed of the iron plate placed behind the manganese bronze handles 1 after the rotating table is machined is at least 70mm/s, so that a workpiece cannot be locally burnt for a long time.

3.3 glowing for catalysis, burning the surface of the manganese bronze handle 1 by using a gas spray gun;

specifically, the neutral flame 4/5 position of the gas spray gun can be used for burning in the burning process, the surface temperature of the manganese bronze handle 1 is detected by using an infrared thermometer, the temperature is controlled to be 350-400 ℃, and the burning time is 140-180 seconds. The burning temperature of the manganese bronze handle 1 is not too high, and the manganese bronze handle is not locally burned for a long time, so that the surface of the workpiece, which can remove moisture on the surface, is completely changed into metal black.

Step 4, waxing the surface of the workpiece;

4.1 waxing when the surface temperature of the manganese bronze handle 1 is reduced to 50-60 ℃.

Specifically, the waxing amount of the general 8-inch manganese bronze handle 1 is 8-11 g.

And 5, wiping the surface of the workpiece.

5.1, uniformly wiping the surface of the manganese bronze handle 1 by using steel wire balls until the surface of the manganese bronze handle 1 is slightly exposed.

Specifically, the surface of the manganese bronze handle 1 needs to be completely wiped in the wiping process, so that the effect that the surface of the manganese bronze handle 1 is seriously damaged by local wiping is avoided.

And 6, ultrasonically removing wax on the surface of the workpiece.

And 7, placing the workpiece, and waiting for varnish sealing.

And (4) clearing the thermal coloring working hours of the single manganese bronze handle 1 by combining the steps.

First in step 1, blasting the single piece manganese bronze pull 1 takes approximately 35 seconds and blasting the single piece manganese bronze air gun takes approximately 5 seconds. Overall in step 1 the one-piece manganese bronze pull 1 takes approximately 35+5=40 seconds.

In step 2, the hanger is hung on the single-piece manganese bronze handle 1 for about 10 seconds; the surface degreasing is carried out by the four manganese bronze handles 1 together, and the time is about 20 seconds; the surface dezincification corrosion is carried out by the four manganese bronze handles 1 together, and the time is about 40 seconds; the first flowing water cleaning is carried out by four manganese bronze handles 1 together, and the time is about 20 seconds; the surface color dipping is carried out by four manganese bronze handles 1 together, and the time is about 60 seconds; the second flowing water cleaning is carried out by four manganese bronze handles 1 together, and the time is about 20 seconds; the surface fixation is carried out by the four manganese bronze handles 1 together, and the time is about 50 seconds; the third flowing water cleaning is carried out by four manganese bronze handles 1 together, and the time is about 20 seconds; the hot water cleaning was performed by four manganese bronze handles 1 together, taking about 10 seconds. Overall in step 2 the one-piece manganese bronze handle 1 takes roughly 10+ (20 +40+20+60+20+50+20+ 10)/4 =70 seconds.

In step 3, it takes about 10 seconds for the single piece of manganese bronze handle 1 to hang down and hot air blow dry, about 3 seconds for the single piece of manganese bronze handle 1 to be placed on the iron plate, and about 12 seconds for the iron plate with 6 pieces of manganese bronze handle 1 to be placed on the machining rotating platform. The duration of the 6 manganese bronze handles 1 co-thermically catalyzed was approximately 180 seconds. Overall in step 3 the one-piece manganese bronze pull 1 takes approximately 10+3+ (12 + 180)/6 =45 seconds.

In step 4, the single piece manganese bronze pull 1 was waxed for approximately 10 seconds.

In step 5, the one-piece manganese bronze handle 1 was wiped for approximately 30 seconds.

In step 6, the ultrasonic wax removal time of the surface of the single piece manganese bronze pull 1 is approximately 10 seconds.

In step 7, the single piece manganese bronze handle 1 is left for approximately 3 seconds.

Therefore, the working hours required by the thermal coloring of the single manganese bronze handle 1 are only 40+70+45+10+30+10+3=208 seconds, compared with the thermal coloring processing of other artware, the required working hours are greatly shortened, the streamlined processing of the thermal coloring of the surface of the copper workpiece is realized, and the processing efficiency of the thermal coloring of the surface of the copper workpiece is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.

Claims

1. A copper workpiece surface thermal coloring method is characterized in that: the method comprises the following steps:

step 1, polishing the surface of a workpiece;

step 2, hanging a hanger on the workpiece to soak the medicine, comprising:

step 2.1, hanging, namely hanging the workpiece with the surface treated on a hanging tool;

step 2.2, removing oil on the surface, namely soaking the hanger with the workpiece in a metal oil removing agent solution;

step 2.3, removing zinc and corroding the surface, and soaking the hanger with the workpiece in a copper chloride solution with the concentration of 18-20 g/L;

step 2.4, washing with flowing water, namely soaking the hanger in a water tank to wash the hanger and the copper chloride on the surface of the workpiece;

step 2.5, performing surface color dipping, namely soaking the hanger in a color dipping solution containing basic copper carbonate and ammonia water, wherein the color dipping solution for workpiece color dipping is a mixed solution of the basic copper carbonate with the concentration of 80-120 g/L and the ammonia water with the concentration of 800-900 g/L and the pH value of 9.5-10.5, and the soaking time of the color dipping solution is 50-70 seconds, so that the surface of the workpiece is blackened;

step 2.6, washing with flowing water, namely soaking the hanger in a water tank to wash the hanger and the color soaking liquid on the surface of the workpiece;

step 2.7, fixing the color on the surface, namely soaking a hanger in a color fixing solution containing copper nitrate, wherein the color fixing solution for soaking the workpiece is a copper nitrate solution with the concentration of 60-70 g/L and the pH value of 3-4, and the color fixing solution is soaked for 40-60 seconds, so that the workpiece can be further deepened;

step 2.8, washing with flowing water, and soaking the hanger in a water tank to wash the hanger and the color fixing solution on the surface of the workpiece; and

step 2.9, cleaning with hot water, and soaking the hanger in hot water at 80-90 ℃ to accelerate the color curing of the surface of the workpiece;

step 3, a hanger below the workpiece is scorched and catalyzed, so that the surface of the workpiece can be completely changed into a metal black sense after moisture on the surface is removed;

step 4, waxing the surface of the workpiece; and

and 5, wiping the surface of the workpiece.

2. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: in the step 2.3, a rotary hanging point for hanging the hanger is arranged above the copper chloride solution, the hanger of the hanger is hung on the rotary hanging point and rotates under the driving of the rotary hanging point, so that the workpiece is fully soaked in the copper chloride solution, a large amount of zinc components are contained in manganese bronze, and the zinc element and the copper chloride solution are subjected to full displacement reaction to remove the zinc components on the surface of the workpiece; in the step 2.7, a rotary hanging point for hanging and connecting a hanging tool is arranged above the color fixing liquid.

3. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: the flowing water cleaning device comprises a first water tank, a second water tank and a third water tank, wherein workpieces sequentially pass through the first water tank, the second water tank and the third water tank, and a flowing water source is arranged above the third water tank and sequentially enters the third water tank, the second water tank and the first water tank.

4. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: the step 1 comprises the following steps:

5. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: the step 3 comprises the following steps:

6. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: and 4, waxing when the surface temperature of the workpiece is reduced to 50-60 ℃.

7. The method for thermally coloring the surface of a copper workpiece according to claim 1, wherein: step 5, wiping the surface of the workpiece by using a steel wire ball;

the copper workpiece surface thermal coloring method further comprises the following steps after the step 5:

step 6, ultrasonic dewaxing of the surface of the workpiece;

and 7, placing the workpiece, and waiting for varnish sealing.