阅读说明：本技术 一种薄坯高雕錾花工艺 (High-carving and flower-carving process for thin blank ) 是由 丁剑韬 丁勇 于 2021-09-09 设计创作，主要内容包括：本发明属于银器加工技术领域,具体涉及一种薄坯高雕錾花工艺；包括如下步骤：塑形：使用橡皮泥对设计产品进行塑形制作；制模：根据产品的复杂程度进行泥稿分类；转化简易模型：采用低温合金制作成型基模,将泥稿转化成金属模具；银坯成型：使用液压机械设备或纯手工冲压的方式成型；錾花：在成型的银坯表面进行錾刻、镂空、正反面抬压；打磨焊接：将錾花后的银器进行打磨焊接；表面处理：将其表面进行处理；装箱入库：将处理后的成品进行装箱入库；此方法成本投入少,利用率高,提高产品的良品率。(The invention belongs to the technical field of silverware processing, and particularly relates to a thin-blank high-carving flower chiseling process; the method comprises the following steps: shaping: shaping and manufacturing a designed product by using plasticine; molding: classifying the mud drafts according to the complexity of the products; transforming a simple model: manufacturing a forming base die by using low-temperature alloy, and converting the clay draft into a metal die; and (3) silver blank molding: forming by using hydraulic mechanical equipment or a pure manual stamping mode; and (3) flower carving: performing carving, hollowing and lifting and pressing on the front and back surfaces of the formed silver blank; polishing and welding: polishing and welding the silverware subjected to flower carving; surface treatment: treating the surface of the glass; boxing and warehousing: boxing and warehousing the treated finished product; the method has the advantages of low cost investment, high utilization rate and improvement of the yield of products.)

1. A thin blank high carving and flower carving process is characterized by comprising the following steps: the method comprises the following steps:

1) shaping: shaping and manufacturing a designed product by using plasticine;

2) molding: classifying the mud drafts according to the complexity of the products;

3) transforming a simple model: manufacturing a forming base die by using low-temperature alloy, and converting the clay draft into a metal die;

4) and (3) silver blank molding: forming by using hydraulic mechanical equipment or a pure manual stamping mode;

5) and (3) flower carving: performing carving, hollowing and lifting and pressing on the front and back surfaces of the formed silver blank;

6) polishing and welding: polishing and welding the silverware subjected to flower carving;

7) surface treatment: treating the surface of the glass;

8) boxing and warehousing: and (5) boxing and warehousing the treated finished product.

2. The thin blank high carving and carving process as claimed in claim 1, wherein the process comprises the following steps: the specific operation of the step 3) is as follows: placing the classified model clay draft on a plane material, casting liquid after paraffin is melted, separating the liquid wax from the clay draft after the liquid wax is cooled and solidified to obtain a wax mold opposite to the clay draft, taking the obtained wax mold as a female mold, placing the wax mold on a glass plate, casting a uniform mixed solution of gypsum powder and water, separating the wax mold from the gypsum mold after the liquid wax is solidified to obtain a gypsum male mold, drying the gypsum male mold, placing the dried gypsum male mold in a sand box, filling a sand-soil mixture or casting sand, turning the sand box to fill the sand box, taking out the gypsum mold to obtain a female mold sand mold, casting the melted low-temperature alloy into the sand mold, cooling to obtain a metal male mold, and casting a metal female mold again on the metal male mold to obtain a complete set of metal molds.

3. The thin stock high carving and carving process as claimed in claim 1 or 2, wherein: the low-temperature alloy is a tin-bismuth alloy.

4. The thin blank high carving and carving process as claimed in claim 2, wherein the high carving and carving process comprises the following steps: after melting, the paraffin is cooled to 30-40 ℃ and then cast on the clay draft, and the paraffin liquid is 1-2cm higher than the highest position of the clay draft.

5. The thin blank high carving and carving process as claimed in claim 2, wherein the high carving and carving process comprises the following steps: the ratio of the gypsum powder to the water is 4: 6, and when the gypsum is cast, a vacuum-pumping device is arranged to perform auxiliary exhaust on the gypsum.

6. The thin blank high carving and carving process as claimed in claim 5, wherein the high carving and carving process comprises the following steps: when the gypsum powder is mixed with water, 3 per mill of gypsum retarder in water volume ratio is added into the water.

7. The thin blank high carving and carving process as claimed in claim 2, wherein the high carving and carving process comprises the following steps: natural drying of the gypsum male mold is used.

8. The thin blank high carving and carving process as claimed in claim 2, wherein the high carving and carving process comprises the following steps: the sand-soil mixture comprises common river sand and sodium bentonite, wherein the common river sand comprises 100-mesh, 200-mesh and 300-mesh river sand, wherein the 100-mesh river sand accounts for 50%, and the 200-mesh and 300-mesh river sand respectively account for 25%, and the addition amount of the sodium bentonite is 7-12% of that of the common river sand; so that the water content of the sand-soil mixture is 2-4%.

Technical Field

The invention belongs to the technical field of silverware processing, and particularly relates to a thin-blank high-carving flower chiseling process.

Background

The thin blank refers to a 2-3 CM high relief sculpture which is beaten by a thin blank sheet with the thickness of 0.2MM when the thickness of the thin material is the thinnest; the high relief refers to a relief sculpture higher than the plane of the material; a chisel is a technique for striking a chisel to work a metal. The process is a comprehensive technique integrating the processes of drawing, sculpture, pottery, mould making, metal forming, carving and the like. The method is characterized in that: the product has strong stereoscopic impression, the pure manual manufacturing process is relatively quick and convenient, the production cost investment is less, the expandable application range is wide, and the method can be applied to the processing and manufacturing of metals such as gold, silver, copper and the like with certain ductility and softness.

The thin blank and the high carving are opposite and uniform, the curved surface is greatly changed in the process of generally punching and forming the traditional metal, the required metal thickness is thicker to ensure the damage of the strength such as stretching and shrinkage and the like to the material in the forming process, the thin blank pursues the limit thickness under certain conditions, the requirement of metal forming is ensured, the workpiece is ensured to keep relatively uniform thickness, and the use of raw materials is saved to the maximum extent.

Disclosure of Invention

The invention aims to provide a thin blank high carving and carving process, which has the advantages of low cost investment, high utilization rate and improvement on the yield of products.

In order to solve the technical problems, the invention adopts the following technical scheme:

a thin blank high carving and flower carving process comprises the following steps:

1) shaping: shaping and manufacturing a designed product by using plasticine;

2) molding: classifying the mud drafts according to the complexity of the products;

3) transforming a simple model: manufacturing a forming base die by using low-temperature alloy, and converting the clay draft into a metal die;

4) and (3) silver blank molding: forming by using hydraulic mechanical equipment or a pure manual stamping mode;

5) and (3) flower carving: performing carving, hollowing and lifting and pressing on the front and back surfaces of the formed silver blank;

6) polishing and welding: polishing and welding the silverware subjected to flower carving;

7) surface treatment: treating the surface of the glass;

8) boxing and warehousing: and (5) boxing and warehousing the treated finished product.

Further, the specific operation of step 3) is: placing the classified model clay draft on a plane material, casting liquid after paraffin is melted, separating the liquid wax from the clay draft after the liquid wax is cooled and solidified to obtain a wax mold opposite to the clay draft, taking the obtained wax mold as a female mold, placing the wax mold on a glass plate, casting a uniform mixed solution of gypsum powder and water, separating the wax mold from the gypsum mold after the liquid wax is solidified to obtain a gypsum male mold, drying the gypsum male mold, placing the dried gypsum male mold in a sand box, filling a sand-soil mixture or casting sand, turning the sand box to fill the sand box, taking out the gypsum mold to obtain a female mold sand mold, casting the melted low-temperature alloy into the sand mold, cooling to obtain a metal male mold, and casting a metal female mold again on the metal male mold to obtain a complete set of metal molds.

Further, the low-temperature alloy is a tin-bismuth alloy.

Further, after melting the paraffin, cooling to 30-40 ℃, and then casting on the clay draft, wherein the paraffin liquid exceeds the highest position of the clay draft by 1-2 cm.

Further, the ratio of the gypsum powder to the water is 4: 6, and when the gypsum is cast, a vacuum-pumping device is arranged to perform auxiliary exhaust on the gypsum.

Further, when the gypsum powder is mixed with water, a gypsum retarder with the volume ratio of 3 per mill of water is added into the water.

Further, natural drying of the gypsum male mold is used.

Further, the sand-soil mixture comprises common river sand and sodium bentonite, wherein the common river sand comprises 100-mesh, 200-mesh and 300-mesh river sand, wherein the 100-mesh accounts for 50%, and the 200-mesh and 300-mesh accounts for 25% respectively, and the addition amount of the sodium bentonite is 7-12% of that of the common river sand; the water content of the sandy soil mixture is 2-4%

Compared with the prior art, the invention has at least one of the following beneficial effects:

1. according to the invention, through the steps of shaping, molding, converting a simple model, silver blank forming, carving, polishing and welding, surface treatment and boxing and warehousing, high carving can be carried out on the thin blank, and compared with the existing process that the carving can be carried out only when the metal is thicker, the process can not only meet the requirement of metal forming, but also ensure that the workpiece can keep relatively uniform thickness, and save the use of raw materials to the maximum extent.

2. The invention selects the tin-bismuth alloy, the melting point of the tin-bismuth alloy is about 360 degrees, the metal shrinkage rate is only 0.082%, the higher model reduction rate can be ensured when the liquid state is converted into the solid state, meanwhile, the metal has higher hardness and strength, the silver sheet stamping is correctly operated and used for 300 times and 500 times under the pressure of 30 tons, the metal model has no deformation, the metal can be repeatedly utilized, and the method is energy-saving, environment-friendly, flexible and changeable.

3. The gypsum retarder is arranged to delay the gypsum setting time to assist in exhausting.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

As shown in fig. 1, in order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1

A thin blank high carving and flower carving process comprises the following steps:

1) shaping: shaping and manufacturing a designed product by using plasticine;

2) molding: classifying the mud draft according to the complexity of the product, and dividing the mud draft into a plurality of or groups of half-face models according to the complexity of the product, such as: an ornament similar to a sphere or an ellipsoid is simply divided into a left half and a right half during mold division (namely a two-opening model), if the ornament is manufactured into an animal standing posture type, the mold division is relatively complex, a body, four limbs, a tail, a head and the like can be divided into a plurality of groups of independent two-half models according to specific shapes, the two-half models are manufactured in a mold division mode, and finally the two-half models are combined and welded to form a complete model;

3) transforming a simple model: the method is characterized in that a low-temperature alloy is adopted to manufacture a forming base die, a mud draft is converted into a metal die, and the method specifically comprises the following steps: placing the classified model clay draft on a plane material, casting liquid after paraffin is melted, cooling and solidifying liquid wax, cooling to 30 ℃ after paraffin is melted, casting the wax onto the clay draft, enabling the wax liquid to exceed the highest position of the clay draft by 1cm, separating the wax liquid from the clay draft to obtain a wax mold opposite to the clay draft, wherein the obtained wax mold is a female mold, placing the wax mold on a glass plate, casting uniformly mixed liquid of gypsum powder and water, separating the wax mold after solidification to obtain a gypsum male mold, and the ratio of the gypsum powder to the water is 4: 6, when gypsum is cast, a vacuumizing device is arranged to perform auxiliary exhaust, when gypsum powder is mixed with water, a gypsum retarder with the volume ratio of 3 per thousand of the water is added into the water, the gypsum male mold is dried naturally, the dried gypsum male mold is placed in a sand box and filled with sand-soil mixture or casting sand, after the sand box is filled with the dry gypsum male mold, the sand-soil mixture comprises common river sand and sodium bentonite, wherein the common river sand comprises 100-mesh, 200-mesh and 300-mesh river sand, the content of 100-mesh, 200-mesh and 300-mesh accounts for 25% respectively, and the content of sodium bentonite accounts for 7% of the content of the common river sand; the water content of the sand-soil mixture is enabled to be 2%, the sand box is turned over to take out the gypsum mold, a female mold sand mold is obtained, the melted low-temperature alloy is cast into the sand mold, a metal male mold is obtained after cooling, the metal female mold is cast on the metal male mold again, and a complete pair of metal molds is obtained, wherein the low-temperature alloy is a tin-bismuth alloy;

4) and (3) silver blank molding: the forming method is characterized by forming by using hydraulic mechanical equipment or a pure manual stamping method, wherein the pure manual stamping method comprises the following steps: firstly, putting a sheet material with required thickness on a metal female die, hammering the sheet material according to a curved surface from deep to shallow by using a tool such as a wooden hammer or a nylon rod, hammering the sheet material again after annealing, after repeating for a plurality of times, when the sheet material is approximately inosculated with the female die, clamping the sheet material by using a male die and the female die, and manually punching the sheet material by using an iron hammer with certain weight to form the sheet material;

the method for manufacturing the high-strength TPU material by using the hydraulic equipment comprises the steps of placing a sheet material on a TPU elastic material, and pressing the sheet material by using a male die, wherein the TPU material has the advantages that the rapid forming can be realized under the condition of large change of a curved surface, the material can be protected to the maximum extent in the product forming process, and the sheet material is prevented from being damaged by excessive mechanical stress in the forming process;

5) and (3) flower carving: performing carving, hollowing and lifting and pressing on the front and back surfaces of the formed silver blank;

6) polishing and welding: polishing and welding the silverware subjected to carving, and further performing further fine processing such as carving, hollowing, lifting and pressing the front and back surfaces by using metal chisels with different shapes;

7) surface treatment: treating the surface of the glass;

8) boxing and warehousing: and (5) boxing and warehousing the treated finished product.

According to the invention, through the steps of shaping, molding, converting a simple model, silver blank forming, carving, polishing and welding, surface treatment and boxing and warehousing, high carving can be carried out on a thin blank, and compared with the existing process that the carving can be carried out only when the metal is thicker, the process can not only ensure the requirement of metal forming, but also ensure that the workpiece can keep relatively uniform thickness, and save the use of raw materials to the maximum extent; the method selects the tin-bismuth alloy, the melting point of the tin-bismuth alloy is about 360 degrees, the metal shrinkage rate is only 0.082%, the higher model reduction rate can be ensured when the liquid state is converted into the solid state, meanwhile, the metal has higher hardness and strength, the silver sheet is correctly operated and used for stamping for 300 times and 500 times under the pressure of 30 tons, the metal model has no deformation, the metal can be repeatedly utilized, and the method is energy-saving, environment-friendly, flexible and changeable; the gypsum retarder is arranged to delay the gypsum setting time to assist in exhausting.

Example 2

A thin blank high carving and flower carving process comprises the following steps:

1) shaping: shaping and manufacturing a designed product by using plasticine;

2) molding: classifying the mud draft according to the complexity of the product, and dividing the mud draft into a plurality of or groups of half-face models according to the complexity of the product, such as: an ornament similar to a sphere or an ellipsoid is simply divided into a left half and a right half during mold division (namely a two-opening model), if the ornament is manufactured into an animal standing posture type, the mold division is relatively complex, a body, four limbs, a tail, a head and the like can be divided into a plurality of groups of independent two-half models according to specific shapes, the two-half models are manufactured in a mold division mode, and finally the two-half models are combined and welded to form a complete model;

3) transforming a simple model: the method is characterized in that a low-temperature alloy is adopted to manufacture a forming base die, a mud draft is converted into a metal die, and the method specifically comprises the following steps: placing the classified model clay draft on a plane material, casting liquid after paraffin is melted, cooling and solidifying liquid wax, cooling to 35 ℃ after paraffin is melted, casting the wax onto the clay draft, enabling the wax liquid to exceed the highest position of the clay draft by 1.5cm, separating the wax liquid from the clay draft to obtain a wax mold opposite to the clay draft, wherein the obtained wax mold is a female mold, placing the wax mold on a glass plate, casting uniformly mixed liquid of gypsum powder and water, separating the solidified wax mold to obtain a gypsum male mold, and the ratio of the gypsum powder to the water is 4: 6, when gypsum is cast, a vacuumizing device is arranged to perform auxiliary exhaust, when gypsum powder is mixed with water, a gypsum retarder with the volume ratio of 3 per thousand of the water is added into the water, the gypsum male mold is dried naturally, the dried gypsum male mold is placed in a sand box and filled with sand-soil mixture or casting sand, after the sand box is filled with the dry gypsum male mold, the sand-soil mixture comprises common river sand and sodium bentonite, wherein the common river sand comprises 100-mesh, 200-mesh and 300-mesh river sand, the content of 100-mesh, 200-mesh and 300-mesh accounts for 25% respectively, and the content of sodium bentonite accounts for 10% of the content of the common river sand; the water content of the sand-soil mixture is enabled to be 3%, the sand box is turned over to take out the gypsum mold, a female mold sand mold is obtained, the melted low-temperature alloy is cast into the sand mold, a metal male mold is obtained after cooling, the metal female mold is cast on the metal male mold again, a complete metal mold is obtained, and the low-temperature alloy is a tin-bismuth alloy;

4) and (3) silver blank molding: forming by using hydraulic mechanical equipment or a pure manual stamping mode;

the pure manual stamping mode is as follows: firstly, putting a sheet material with required thickness on a metal female die, hammering the sheet material according to a curved surface from deep to shallow by using a tool such as a wooden hammer or a nylon rod, hammering the sheet material again after annealing, after repeating for a plurality of times, when the sheet material is approximately inosculated with the female die, clamping the sheet material by using a male die and the female die, and manually punching the sheet material by using an iron hammer with certain weight to form the sheet material;

the method for manufacturing the high-strength TPU material by using the hydraulic equipment comprises the steps of placing a sheet material on a TPU elastic material, and pressing the sheet material by using a male die, wherein the TPU material has the advantages that the rapid forming can be realized under the condition of large curve surface change, the material can be protected to the maximum extent in the product forming process, and the sheet material is prevented from being damaged by excessive mechanical stress in the forming process.

5) And (3) flower carving: performing carving, hollowing and front and back face lifting on the surface of the formed silver blank, and performing further fine processing such as carving, hollowing and front and back face lifting by using metal chisels with different shapes;

6) polishing and welding: polishing and welding the silverware subjected to flower carving;

7) surface treatment: treating the surface of the glass;

8) boxing and warehousing: and (5) boxing and warehousing the treated finished product.

According to the invention, through the steps of shaping, molding, converting a simple model, silver blank forming, carving, polishing and welding, surface treatment and boxing and warehousing, high carving can be carried out on a thin blank, and compared with the existing process that the carving can be carried out only when the metal is thicker, the process can not only ensure the requirement of metal forming, but also ensure that the workpiece can keep relatively uniform thickness, and save the use of raw materials to the maximum extent; the method selects the tin-bismuth alloy, the melting point of the tin-bismuth alloy is about 360 degrees, the metal shrinkage rate is only 0.082%, the higher model reduction rate can be ensured when the liquid state is converted into the solid state, meanwhile, the metal has higher hardness and strength, the silver sheet is correctly operated and used for stamping for 300 times and 500 times under the pressure of 30 tons, the metal model has no deformation, the metal can be repeatedly utilized, and the method is energy-saving, environment-friendly, flexible and changeable; the gypsum retarder is arranged to delay the gypsum setting time to assist in exhausting.

Example 3

A thin blank high carving and flower carving process comprises the following steps:

1) shaping: shaping and manufacturing a designed product by using plasticine;

2) molding: classifying the mud draft according to the complexity of the product, and dividing the mud draft into a plurality of or groups of half-face models according to the complexity of the product, such as: an ornament similar to a sphere or an ellipsoid is simply divided into a left half and a right half during mold division (namely a two-opening model), if the ornament is manufactured into an animal standing posture type, the mold division is relatively complex, a body, four limbs, a tail, a head and the like can be divided into a plurality of groups of independent two-half models according to specific shapes, the two-half models are manufactured in a mold division mode, and finally the two-half models are combined and welded to form a complete model;

3) transforming a simple model: the method is characterized in that a low-temperature alloy is adopted to manufacture a forming base die, a mud draft is converted into a metal die, and the method specifically comprises the following steps: placing the classified model clay draft on a plane material, casting liquid after paraffin is melted, cooling and solidifying liquid wax, cooling the melted paraffin to 40 ℃ and then casting the melted paraffin on the clay draft, enabling the paraffin to exceed the highest position of the clay draft by 2cm, separating the wax liquid from the clay draft to obtain a wax mold opposite to the clay draft, wherein the obtained wax mold is a female mold, placing the wax mold on a glass plate, casting uniformly mixed liquid of gypsum powder and water, separating the solidified paraffin mold from the gypsum mold to obtain a gypsum male mold, and the ratio of the gypsum powder to the water is 4: 6, when gypsum is cast, a vacuumizing device is arranged to perform auxiliary exhaust, when gypsum powder is mixed with water, a gypsum retarder with the volume ratio of 3 per thousand of the water is added into the water, the gypsum male mold is dried naturally, the dried gypsum male mold is placed in a sand box and filled with sand-soil mixture or casting sand, after the sand box is filled with the dry gypsum male mold, the sand-soil mixture comprises common river sand and sodium bentonite, wherein the common river sand comprises 100-mesh, 200-mesh and 300-mesh river sand, the content of 100-mesh, 200-mesh and 300-mesh accounts for 25% respectively, and the content of sodium bentonite accounts for 12% of the content of the common river sand; the water content of the sand-soil mixture is enabled to be 4%, the sand box is turned over to take out the gypsum mold, a female mold sand mold is obtained, the melted low-temperature alloy is cast into the sand mold, a metal male mold is obtained after cooling, the metal female mold is cast on the metal male mold again, and a complete pair of metal molds is obtained, wherein the low-temperature alloy is a tin-bismuth alloy;

4) and (3) silver blank molding: the forming method is characterized by forming by using hydraulic mechanical equipment or a pure manual stamping method, wherein the pure manual stamping method comprises the following steps: firstly, putting a sheet material with required thickness on a metal female die, hammering the sheet material according to a curved surface from deep to shallow by using a tool such as a wooden hammer or a nylon rod, hammering the sheet material again after annealing, after repeating for a plurality of times, when the sheet material is approximately inosculated with the female die, clamping the sheet material by using a male die and the female die, and manually punching the sheet material by using an iron hammer with certain weight to form the sheet material;

the method for manufacturing the high-strength TPU material by using the hydraulic equipment comprises the steps of placing a sheet material on a TPU elastic material, and pressing the sheet material by using a male die, wherein the TPU material has the advantages that the rapid forming can be realized under the condition of large curve surface change, the material can be protected to the maximum extent in the product forming process, and the sheet material is prevented from being damaged by excessive mechanical stress in the forming process. (ii) a

4) And (3) flower carving: performing carving, hollowing and front and back face lifting on the surface of the formed silver blank, and performing further fine processing such as carving, hollowing and front and back face lifting by using metal chisels with different shapes;

5) polishing and welding: polishing and welding the silverware subjected to flower carving;

6) surface treatment: treating the surface of the glass;

8) boxing and warehousing: and (5) boxing and warehousing the treated finished product.

According to the invention, through the steps of shaping, molding, converting a simple model, silver blank forming, carving, polishing and welding, surface treatment and boxing and warehousing, high carving can be carried out on a thin blank, and compared with the existing process that the carving can be carried out only when the metal is thicker, the process can not only ensure the requirement of metal forming, but also ensure that the workpiece can keep relatively uniform thickness, and save the use of raw materials to the maximum extent; the method selects the tin-bismuth alloy, the melting point of the tin-bismuth alloy is about 360 degrees, the metal shrinkage rate is only 0.082%, the higher model reduction rate can be ensured when the liquid state is converted into the solid state, meanwhile, the metal has higher hardness and strength, the silver sheet is correctly operated and used for stamping for 300 times and 500 times under the pressure of 30 tons, the metal model has no deformation, the metal can be repeatedly utilized, and the method is energy-saving, environment-friendly, flexible and changeable; the gypsum retarder is arranged to delay the gypsum setting time to assist in exhausting.

Experimental analysis:

experimental groups: the finished products prepared in examples 1 to 3 of the present invention were used;

control group: a finished product with the same size as that of the embodiment 1-3 of the invention is manufactured by a common method;

the experimental steps are as follows: the experimental group 1, the experimental group 2, the experimental group 3, the control group 1, the control group 2, the control group 3 and 30 products in each group are measured, the average value is calculated, and the statistical result is as follows:

	weight/g	Number of surface defects/	Thickness of material/mm	Thickness/cm of relief
					Example 1	20	0	0.2	2.7
Control group 1	98	2	0.9	2.6
					Example 2	20	0	0.2	3
Control group 2	100	1	0.8	2.7
					Example 3	20	1	0.2	2.8
Control group 3	99	3	0.8	2.5

As can be seen from table 1, the product prepared by the present invention can be made into the same product as the conventional process, can use thinner material when the same relief height is achieved, and has light weight and low surface defect rate.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.