CN113385592B

CN113385592B - Colored copper and manufacturing method thereof

Info

Publication number: CN113385592B
Application number: CN202110655635.5A
Authority: CN
Inventors: 秦斌
Original assignee: Jiaxing Bolang Metal Technology Co ltd
Current assignee: Jiaxing Bolang Metal Technology Co ltd
Priority date: 2021-06-11
Filing date: 2021-06-11
Publication date: 2022-07-01
Anticipated expiration: 2041-06-11
Also published as: CN113385592A

Abstract

The invention discloses a color copper and a manufacturing method thereof. Stacking, namely selecting red copper, brass and cupronickel flat plates as raw materials, and alternately stacking the three materials; thermoforming, namely putting the stacked copper plates into an isostatic pressing furnace and applying high temperature and high pressure; hot forging, namely placing the copper block subjected to heating combination in heating equipment for heating, and then placing the copper block in a hot forging die for forging; hot rolling, namely reheating the blank and then rolling by using hot rolling equipment; cold pressing, namely cold pressing the hot rolled sheet into a thin sheet; pressing lines, wherein pits with different depths and bulges with different heights are pressed on the surface of a die or a roller with concave and convex surfaces; grinding and polishing, namely grinding the surface of the copper plate; and finally, carrying out finished product inspection. The invention has unique design and simple manufacturing process, can make the surfaces of appliances, ornaments and artworks appear colorful, the colorful metal is carried by metal, the interior and the surface of the metal are simultaneously provided, and the colorful metal cannot disappear due to factors such as abrasion, corrosion, peeling and the like.

Description

Colored copper and manufacturing method thereof

Technical Field

The invention relates to the technical field of metal manufacturing, in particular to colored copper and a manufacturing method thereof.

Background

Copper is one of the earliest metals used by human beings, and as early as prehistoric times, people begin to mine open-air copper ores and use the obtained copper to manufacture weapons, tools and other utensils, and the use of copper has a profound effect on the progress of early human civilization. Copper is a metal present in the earth's crust and in the ocean. The copper content in the earth crust is about 0.01%, and in individual copper deposits, the copper content can reach 3% to 5%. Copper in nature is mostly present as a compound, i.e., copper ore.

In daily life, people often use metal to manufacture various appliances, ornaments and artworks, such as bracelets, rings, flashlights and the like. However, metals usually only show one color, and people adopt various processing means such as surface gold plating, blackening, texturing and etching to enrich the surface color of the product. The colors developed by these conventional methods often suffer from abrasion, corrosion, flaking, and the like. Copper is one of the most commonly used metals and can be used to make copper pots, copper ornaments, copper cutlery, etc.

Although the variety of copper is various, when the existing copper plate raw material is refined and forged, the color is single, so that the processed subsequent copper product has single color, the problem of color unicity is obvious, the subsequent process is often needed to perform color enrichment on the product, and the production cost is higher.

Disclosure of Invention

The invention aims to solve the defects that the color of the existing copper plate raw material is single when the copper plate raw material is refined and forged, so that the subsequent copper product processed is single in color and single in color, the subsequent process is often needed for enriching the color of the product, and the production cost is high in the prior art, and provides colored copper and a manufacturing method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a manufacturing method of colored copper comprises the following steps:

s1: stacking, namely selecting red copper, brass and cupronickel flat plates as raw materials, and alternately stacking the three materials, wherein the stacking quantity is not less than 20 layers;

s2: thermoforming, namely putting the stacked copper plates into an isostatic pressing furnace, applying high temperature and high pressure, and finally realizing metallurgical bonding among different copper through deformation and diffusion at high temperature to ensure that a composite copper block formed by the red copper plate, the brass plate and the white copper plate is completely changed into a combined body of multiple copper layers;

s3: hot forging, namely putting the copper blank subjected to heating combination into heating equipment again for heating, wherein the heating rate is less than or equal to 120 ℃/h, heating to the initial forging temperature of 800-900 ℃, preserving heat, maintaining a certain temperature, and then putting into a hot forging die for forging, wherein the initial forging temperature is 900 ℃, and the final forging temperature is 600 ℃;

s4: hot rolling, namely taking out the hot forged copper plate, hoisting the received plate blank to a feeding roller way of a heating furnace block by using a crane, placing the plate blank at intervals, inspecting the selected plate, sending the plate blank into the heating furnace block by block at intervals of 90-100 s for secondary heating after the plate blank meets the acceptance standard, setting the heating temperature to be 800-900 ℃, the heating time to be 100-120 min, the heat preservation time to be 160-180 min, keeping the heating furnace under a certain air pressure during the heat preservation, introducing nitrogen into the heating furnace, wherein the introduction amount is 5-10 cm m, rolling the plate blank by using a rolling mill after the plate blank is taken out of the furnace, and straightening and trimming the plate blank into a finished product;

s5: and (5) cold pressing, namely placing the finished sheet in the fourth step into a film cavity, then carrying out cold pressing molding on a press, wherein the cold pressing pressure is 80-900Mpa, only one copper plate is pressed by one-time cold pressing, and the thickness of the pressed copper plate is controlled to be 1 mm.

S6: line pressing: pits with different deep lines and bulges with different heights are pressed on the surface of a die or a roller with concave and convex surfaces, so that the texture structure is changed, three color layers of purple, yellow and white in the copper plate are not parallel any more after being deformed and are curves rich in change, each color layer is not parallel any more, and the thickness of each layer is changed due to the deformation;

s7: grinding and polishing: grinding the surface of the copper plate to enable the copper plate to be a smooth surface, finishing the manufacturing of the multicolor copper with the surface showing combination of purple, yellow and white, and finally polishing the surface to enable the purple, yellow and white colors on the surface of the copper plate to be clearer and more striking;

s8: and (5) inspecting a finished product, namely performing color forming analysis on the finished product by using a metal analyzer, and checking whether the required requirements are met.

Preferably, after the S5 process is finished, annealing treatment is carried out, the cold-pressed raw material is put into a heating furnace and heated to 800 +/-50 ℃ again for 6-10 minutes, the molecular structure of the material is uniformly arranged again under the action of high temperature, and the internal stress and the hardness of the raw material are eliminated.

Preferably, the hot rolling is performed by firstly performing reciprocating rolling on the blank in a roughing mill for 3 times so that the blank becomes an intermediate blank, and the intermediate blank is continuously rolled in a finishing mill for 7 times to finally form a finished product.

Preferably, the heating equipment used before hot rolling is provided with an electric heating wire which can heat incoming materials, and the heating temperature is 800-900 ℃.

Preferably, the material subjected to line pressing treatment is put into a precise double-sided grinding machine for grinding, so that the material is uniform in thickness and bright in surface, and the thickness tolerance of the material is within 0.1 mm.

Preferably, the formed copper is placed on a storage rack, the surface of the copper is naturally contacted with air, or the surface of the copper is oxidized or corroded by leaching corrosion of acetic acid, so that the color of the product is brighter.

The colored copper manufactured by the manufacturing method of the colored copper comprises a red copper layer, a brass layer and a cupronickel layer, and is characterized in that the red copper layer, the brass layer and the cupronickel layer are mutually overlapped in a staggered mode, and the minimum number of overlapped layers is not less than 20.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts the raw materials formed by alternately stacking three different colors, combines hot forming, hot forging, hot rolling, cold pressing, line pressing, grinding and polishing and finished product inspection to manufacture the color copper with unique and controllable color, and can produce copper products with various color textures by utilizing the color copper raw materials.

2. The invention has unique design and simple manufacturing process, can make the surfaces of appliances, ornaments and artworks appear colorful, the colorful metal is carried by metal, the interior and the surface of the metal are simultaneously provided, and the colorful metal cannot disappear due to factors such as abrasion, corrosion, peeling and the like.

Drawings

FIG. 1 is a schematic flow chart of a method for manufacturing colored copper according to the present invention;

fig. 2 is an internal layered schematic of colored copper.

In the figure: 1-purple copper layer, 2-brass layer, 3-white copper layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-2, a method for manufacturing colored copper includes the steps of:

s2: hot forming, namely placing the stacked copper plates into an isostatic pressing furnace, applying high temperature and high pressure, and finally realizing metallurgical bonding among different copper plates through deformation and diffusion at high temperature to completely change the composite copper plate formed by the red copper plate, the yellow copper plate and the white copper plate into a copper plate with various copper layers;

s3: hot forging, namely placing the copper plate subjected to heating combination in heating equipment for heating, wherein the heating equipment is provided with an electric heating wire, the heating temperature is 800-;

s4: and hot rolling, namely taking out the hot forged copper plate, hoisting the received plate blank block by block to a feeding roller way of a heating furnace by a crane, placing the plate blank at intervals, checking the selected plate, sending the plate blank into the heating furnace block by block at intervals of 90-100 s for secondary heating after the plate blank meets the acceptance standard, setting the heating temperature to be 800-900 ℃, the heating time to be 100-120 min, the heat preservation time to be 160-180 min, keeping the heating furnace under a certain air pressure during the heat preservation period, introducing nitrogen into the heating furnace at an introduction amount of 5-10 cm, rolling the plate blank by a rolling mill after discharging, straightening and trimming the plate blank into a material, wherein the hot rolling is firstly carried out by a rough rolling mill for 3 times in a reciprocating manner to change the plate blank into an intermediate blank, and the intermediate blank is continuously rolled by a finishing mill for 7 times.

S5: and (2) cold pressing, namely placing the finished sheet in the fourth step into a film cavity, then carrying out cold press molding on a press, wherein the cold pressing pressure is 80-900Mpa, only one copper plate is pressed by one-time cold pressing, the thickness of the pressed copper plate is controlled to be 1mm, and the annealing treatment is carried out on the raw material, wherein the annealing treatment method comprises the following steps: placing the cold-pressed raw materials into a heating furnace, heating to 800 +/-50 ℃ again for 6-10 minutes, and under the action of high temperature, uniformly rearranging the molecular structures of the materials again, and eliminating the internal stress and hardness of the raw materials;

s6: pressing a wire: pits with different deep lines and bulges with different heights are pressed on the surface of a die or a roller with concave and convex surfaces, so that the texture structure is changed, three color layers of purple, yellow and white in the copper plate are not parallel any more after being deformed and are curves rich in change, each color layer is not parallel any more, and the thickness of each layer is changed due to the deformation; at the moment, the material subjected to line pressing treatment is put into a precise double-sided grinder for grinding, so that the material is uniform in thickness and bright in surface, and the thickness tolerance of the material is within 0.1 mm;

s7: grinding and polishing: the copper plate is made to be a smooth surface by grinding the surface of the copper plate, the manufacturing of the multicolor copper with the combination of purple, yellow and white colors on the surface is completed, the surface is polished finally, the purple, yellow and white colors on the surface of the copper plate are clearer and more striking, the formed copper is placed on a storage rack to naturally contact with air, or the surface is oxidized or corroded by leaching corrosion of acetic acid, so that the color of a product is more bright;

s8: and (5) inspecting a finished product, namely performing color analysis on the finished product by using a metal analyzer, and checking whether the required requirements are met.

The color copper manufactured by the manufacturing method of the color copper comprises a red copper layer 1, a brass layer 2 and a white copper layer 3;

the red copper layer 1, the brass layer 2 and the white copper layer 3 are mutually staggered and stacked, and the lowest number of stacked layers is not less than 20.

In the invention, three raw materials with different colors are alternately stacked to form a raw material, and hot forming, hot forging, hot rolling, cold pressing, line pressing, grinding and polishing and finished product inspection are combined to manufacture the color copper with unique and controllable colors, and the copper product with various color textures can be produced by utilizing the color copper raw material.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A method for manufacturing colored copper is characterized by comprising the following steps:

s2: hot forming, namely placing the stacked copper plates into an isostatic pressing furnace, applying high temperature and high pressure, and finally realizing metallurgical bonding among different copper plates through deformation and diffusion at high temperature to ensure that a composite copper block formed by the red copper plate, the brass plate and the white copper plate is completely changed into a combined body of a plurality of copper layers;

s5: cold pressing, namely placing the finished sheet in the fourth step into a film cavity, then carrying out cold press molding on a press, wherein the cold pressing pressure is 80-900Mpa, only one copper plate is pressed by one-time cold pressing, and the thickness of the pressed copper plate is controlled to be 1 mm;

2. The method for manufacturing colored copper according to claim 1, wherein the raw material is annealed after the S5 process is completed, wherein the annealing process comprises: and (3) putting the cold-pressed raw materials into a heating furnace, heating to 800 +/-50 ℃ for 6-10 minutes, and under the action of high temperature, uniformly rearranging the atomic structures of the materials, and eliminating the internal stress and hardness of the raw materials.

3. The method for manufacturing colored copper according to claim 1, wherein the hot rolling is performed by first performing 3 passes of the back and forth rolling in the roughing mill so that the blank becomes an intermediate blank, and the intermediate blank is performed by performing 7 passes of the continuous rolling in the finishing mill so as to finally form the hot rolled product.

4. The method as claimed in claim 1, wherein the hot forging heating device comprises heating wires for heating the supplied materials at 800-900 ℃.

5. The method for manufacturing colored copper according to claim 2, wherein the cold-pressed material is ground in a precision double-sided grinder to make the material uniform in thickness and bright in surface, and the thickness tolerance of the material is within 0.1 mm.

6. The method for manufacturing colored copper according to claim 1, wherein the formed copper is placed on a storage rack to be naturally contacted with air, or acetic acid leaching corrosion is performed to oxidize or corrode the surface of the copper, so that the color of the product is more vivid.

7. A colored copper manufactured by the manufacturing method of the colored copper according to any one of claims 1 to 6, comprising a red copper layer (1), a yellow copper layer (2) and a white copper layer (3), wherein the red copper layer (1), the yellow copper layer (2) and the white copper layer (3) are mutually overlapped in a staggered manner, and the number of the overlapped layers is not less than 20.