CN111230008A - A method of surface treatment of metal parts used in a forging process - Google Patents

Abstract

The invention discloses a surface treatment method. The method includes the following steps: using an acid solution to corrode the surface of a metal piece to form micropores on the surface of the metal piece; drying the surface of the metal piece after the corrosion treatment; The surface of the metal part is coated with lubricant, the lubricant is adsorbed in the micropores, and a lubricating film is formed on the surface of the metal part. The invention can effectively improve the surface lubricating effect of the metal piece, can reduce the wear of the forging die and the forging piece, improve the life of the forging die, and reduce the production cost.

Description

A method of surface treatment of metal parts used in a forging process

technical field

The invention relates to the technical field of surface treatment, in particular to a method for surface treatment of a metal piece used in a forging process.

Background technique

The role of lubricants in the forging process is very important. The quality of the lubrication effect directly determines the service life of the forging die, the deformation and appearance quality of the forging, and ultimately determines the forging cost.

At present, the lubrication method used in the forging process is to directly cover an oil film on the surface of the workpiece or mold by spraying, brushing or soaking. The traditional lubrication method makes the effect of covering the surface of the lubricant not good; for example, for materials with high surface finish, such as stainless steel, titanium alloy, etc., it is difficult for the lubricant to cover the surface; when there are raised areas on the surface, lubrication If the lubricant is covered on the raised surface and left for a period of time, the lubricant will easily come off.

In view of any of the above technical problems, the present invention provides a novel method for surface treatment of metal parts used in a forging process.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a method for surface treatment of a metal piece used in a forging process, so as to solve the problem that the lubricant is difficult to adhere to the surface of the metal piece in the prior art.

According to an aspect of the present invention, there is provided a method for surface treatment of a metal piece used in a forging process, the method comprising the steps of:

The acid solution is used to corrode the surface of the metal parts to form micropores on the surface of the metal parts;

Dry the surface of the metal parts after corrosion treatment;

A lubricant is applied to the surface of the metal part formed with the micropores, the lubricant is adsorbed in the micropores, and a lubricating film is formed on the surface of the metal part.

Optionally, before the corrosion treatment is performed on the surface of the metal part, the method further includes:

Pretreatment of the surface of metal parts;

The surface of the pretreated metal parts is cleaned and dried.

Optionally, the surface corrosion treatment of the metal piece by using the acid solution includes: immersing the surface of the metal piece in the acid solution, forming on the surface of the metal piece a diameter of 20nm-40μm and a depth of 20nm-40μm. described micropores.

Optionally, the acid solution includes one or more of oxalic acid, sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, boric acid, formic acid, hydrofluoric acid, and gallic acid.

Optionally, the drying temperature of the drying treatment ranges from 75°C to 85°C, and the drying time ranges from 15min to 25min.

Optionally, the temperature range of the acid solution is: 40°C to 80°C; the soaking time range is: 1min-20min.

Optionally, the acid solution includes: 20 g/L of oxalic acid and 50 g/L of sulfuric acid.

Optionally, the acid solution includes: 30 g/L of oxalic acid and 200 g/L of phosphoric acid.

Optionally, the acid solution includes: 50 g/L of sulfuric acid and 20 g/L of hydrofluoric acid.

Beneficial effects of the present invention: the present invention performs corrosion treatment on the surface of the metal parts to form micropores; when lubricant is applied to the surface, the micropores can absorb the lubricant, thereby forming a layer of lubricating film on the surface of the metal parts, effectively Improve the lubricating effect of the surface; when applied to forging dies and forging parts, it can reduce the wear of forging dies and forging parts, improve the life of forging dies, and reduce production costs.

Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

FIG. 1 is a flow chart of the surface treatment method of the metal part of the present invention.

FIG. 2 shows a flow chart of an embodiment of the surface treatment method of the present invention.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

According to one embodiment of the present invention, a method of surface treating a metal piece used in a forging process. The method includes the following steps:

S12: use acid solution to corrode the surface of the metal parts to form micropores on the surface of the metal parts;

Wherein the metal piece includes a forging die and a forging piece in the forging process. For example, the surface of the metal part can be selectively corroded according to the process conditions in the forging process, so as to form a lubricating film on the surface of the metal part to improve the lubricating performance. For example, when the forging conditions are harsh or the appearance of the forged parts is strictly required, the surfaces of the forging die and the forged parts can be subjected to corrosion treatment, and micropores are formed on the surfaces of the forging die and the forged parts.

The micropores have lipophilic characteristics, and the lubricant is absorbed into the micropores at the moment of contact with the lubricant, so that a layer of lubricating film is formed on the surface of the metal parts, so as to achieve the purpose of efficient lubrication.

For example, the surface of the metal part can be soaked in the acid solution, and the micropores with a diameter of 20 nm-40 μm and a depth of 20 nm-40 μm are formed on the surface of the metal part.

S13: cleaning and drying the surface of the metal part after the corrosion treatment;

The cleaning and drying treatment is specifically as follows: the surface is repeatedly rinsed with clean water, and then the surface is dried and dried in a temperature range of 15 min to 25 min.

S14: Apply a lubricant to the surface of the metal piece formed with the micropores, the micropores are adsorbed with the lubricant, and a lubricating film is formed on the surface of the metal piece.

For example, when both the surfaces of the forging die and the forged part are surface treated at the same time, and a layer of lubricating film is formed on the surfaces of the forging die and the forged part, during the processing of the forged part, the surface of the forging die and the surface of the forged part The friction between them is reduced, on the one hand, the wear on the forging die is reduced, and the service life of the forging die is improved;

Optionally, before adopting the acid solution for the surface corrosion treatment of the metal parts, the method further includes:

S10: pretreating the surface of the metal part;

The pretreatment is specifically as follows: wiping the surface of the metal parts with a absorbent cotton moistened with a solvent, and then wiping several times with a clean cotton cloth after removing the oil stains to complete the degreasing treatment.

S21: cleaning and drying the surface of the pretreated metal part;

The cleaning and drying treatment is specifically as follows: the surface of the forging die is repeatedly washed with clean water and then dried, and the drying temperature ranges from 50°C to 80°C.

The method for surface treatment of metal parts used in the forging process provided in this example, the preliminary treatment of the surface can eliminate the dirt and grease on the surface; the surface is corroded to form micropores, so that the surface obtains a kind of lipophilic The surface microporous morphology is formed, and a layer of lubricating film is formed when the lubricant is coated on the surface, which effectively improves the lubricating effect of the surface. When applied to the forging process, it can effectively reduce the wear between the forging die and the forging parts, improve the life of the forging die, improve the production efficiency, shorten the process cycle and reduce the production cost.

For example, in the forging process, the surface treatment method of the present invention can be used to treat the surface of the forging die and/or the surface of the forged part.

Specifically, processing the surface of the forging die includes the following specific steps:

S20: pretreating the surface of the forging die;

The pretreatment is specifically as follows: wiping the surface of the forging die with a absorbent cotton moistened with a solvent, after removing the oil stains, wiping with a clean cotton cloth several times to complete the degreasing treatment.

S21: cleaning and drying the surface of the pretreated forging die;

The cleaning and drying treatment is specifically as follows: the surface of the forging die is repeatedly washed with clean water and then dried, and the drying temperature ranges from 50°C to 80°C.

S22: adopt acid solution to corrode the surface of the forging die to form micropores on the surface of the forging die;

The corrosion treatment on the surface of the forging die includes: inverting the parting surfaces of the upper and lower dies of the forging die and immersing them in an acid solution, so that the surface of the forging die forms micropores with a diameter of 20 nm-40 μm and a depth of 20 nm-40 μm.

S23: cleaning and drying the surface of the forging die after the corrosion treatment;

The cleaning and drying treatment is specifically as follows: the surface is repeatedly rinsed with clean water, and then the surface is dried and dried. The temperature range is: 15min～25min

S24: coating a lubricant on the surface of the forging die formed with the micropores, the lubricant is adsorbed in the micropores, and a layer of lubricating film is formed on the surface of the forging die.

The forged parts are placed in the surface-treated forging die for forging processing to form a forged product, which improves the appearance aesthetics of the forged product.

In this example, the surface of the forging die is treated by acid solution etching to obtain a microporous structure on the surface of the forging die. The microporous structure has lipophilic surface microporous characteristics, so that the surface of the forging die contacts the lubricant. The lubricant is absorbed into the micropores in an instant, and a layer of lubricating film is formed on the surface of the forging die; during the forging process, the lubricating film formed by the forging die can be set and stored on the surface of the forging die for a long time, improving the forging die. surface lubricity. When the forging piece is combined with the forging die, the wear between the forging piece and the forging die can be reduced, and the service life of the forging die can be improved.

Optionally, the material of the forging die can be selected from: die steel; for example, cold forging die material or hot forging die material can be used, wherein the cold forging die material can be: DC53, carbon tool steel, low alloy cold work die steel, High-speed steel, etc.

Hot forging die material can be: DIVAR, 3Cr2W8V, CG-2, GR, etc.

Specifically, the treatment of the surface of the forging includes the following specific steps:

S30: pretreating the surface of the forging;

The pretreatment is specifically as follows: wiping the surface of the forged part with a absorbent cotton moistened with a solvent, and then wiping with a clean cotton cloth several times to complete the degreasing treatment after removing the oil stain.

S31: cleaning and drying the surface of the pretreated forged part;

The cleaning and drying treatment is specifically as follows: the surface of the forged part is repeatedly washed with clean water and then dried, and the drying temperature ranges from 50°C to 80°C.

S32: use acid solution to corrode the surface of the forging to form micropores on the surface of the forging;

The etching treatment on the surface of the forging includes: immersing the forging in an acid solution to form the micropores with a diameter of 20 nm-40 μm and a depth of 20 nm-40 μm on the surface of the forging.

S33: cleaning and drying the surface of the forged part after the corrosion treatment;

The cleaning and drying treatment is specifically as follows: the surface is repeatedly rinsed with clean water, and then the surface is dried and dried in a temperature range of 15 min to 25 min.

S34: Apply a lubricant to the surface of the forged part formed with the micropores, the lubricant is adsorbed in the micropores, and a layer of lubricating film is formed on the surface of the forged part.

In this example, the surface of the forging is treated by acid solution etching to obtain a microporous structure on the surface of the forging. The lubricant is absorbed into the micropores in an instant, and a layer of lubricating film is formed on the surface of the forging. When the forging is combined with the forging die, the wear between the forging and the forging die can be reduced and the service life of the forging die can be improved.

Optionally, the material of the forging includes any one of steel and titanium alloys.

In an optional embodiment, the surface corrosion treatment of the metal piece by the acid solution includes: immersing the surface of the metal piece in the acid solution, the surface of the metal piece is formed with a diameter of 20 nm-40 μm and a depth of 20 nm-40 μm of the micropores. The inventors found that a surface microporous morphology with a size of 20 nm-40 μm is obtained by treating the surface of the metal part, and the micropores have lipophilic characteristics, which can adsorb lubricants in the microporous structure and form a surface on the surface. layer of lubricating film, and the lubricating film can be stored for a long time to improve the lubricating performance of the surface; when the treatment method is applied to the forging process, for example, the surface treatment method of the present invention is used on the surface of the forging die and/or the surface of the forging part. During the treatment, the wear before the forging die and the forging can be reduced, the service life of the forging die can be increased, and the appearance of the forging can be improved; at the same time, the surface treatment method of the present invention is adopted, so that the lubricant coated on the surface will not fall off easily, In turn, the process time is reduced, the production cost is reduced, and the production line environment is improved.

Optionally, the acid solution includes one or more of oxalic acid, sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, boric acid, formic acid, hydrofluoric acid, and gallic acid.

The acid solution also includes deionized water, wherein the deionized water is pure water after removing impurities in the form of ions.

The acid solution is corrosive, and when the surface of the metal part is corroded by the acid solution, micropores can be formed, and the micropores have lipophilic properties, which can prevent the lubricant coated on the surface of the metal part from falling off.

The inventors of the present invention found that for different materials, different formulations should be used to prepare the solution; that is, the acid solution with different degrees of corrosiveness should be prepared according to different materials.

Example 1:

In this example, surface treatment is performed on the surfaces of the forging die and the forging part, so as to improve the service life of the forging die and reduce the wear between the forging die and the forging part.

For example, the processing method for the forging die in this example is:

The material of the forging die is DC53, the formula of the acid solution for DC53 is 20g/L of oxalic acid, 50g/L of sulfuric acid, and the other components are deionized water. The forging die made of DC53 is immersed in oxalic acid, sulfuric acid and deionized water. In the solution, nano-scale pores are formed on the surface of the forging die.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution, wherein the immersion time is 5min, and the temperature of the acid solution is 80°C;

After the forging die is soaked, it is dried; the drying temperature is 50° C., and the drying time is 15 minutes.

After drying, the surface of the forging die has micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm, and a lubricant is applied to the surface of the micropores.

The inventors found that when DC53 is surface-treated with this solution formulation, micropores with uniform distribution and consistent structure can be formed on the surface, and the diameters of the micropores are in the range of 20nm-400nm, and the depths are in the range of 20nm-400nm. Inside; the surface of the corroded forging die is coated with lubricant, the lubricant can be stored on the surface of the forging die for a long time, and the surface lubrication performance of the forging die is improved.

For example, the processing method of the forging in this example is:

The material of the forging is 316L stainless steel, and the acid solution formula for 316L stainless steel is 30g/L of oxalic acid, 200g/L of phosphoric acid, and other components are deionized water; the forgings made of 316L stainless steel are immersed in oxalic acid, phosphoric acid and deionized water. In the solution composed of water, nano-scale pores will be formed on the surface of the forging.

The forgings are pretreated, and then the pretreated forgings are cleaned and dried;

Immerse the forging in the prepared acid solution, the temperature of the acid solution is 70℃, and the immersion time is 10min;

After the forging is soaked, it is dried; the drying temperature is 80°C, and the drying time is 20min;

After the drying is completed, the surface of the forged part obtains nano-scale micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm.

The forged product formed by forging the surface-treated forging die and the surface-treated forging has good appearance.

The inventors have found that: when the material of the forging is suitable for cold forging, the surface treatment of the surface of the forging die and the surface of the forging can be carried out simultaneously by using the surface treatment method of the present invention, the life of the forging die is increased by 20%, and the processing efficiency is increased by 20%. With an increase of 10%, the appearance effect of the forged product formed by the forging process of the forged part is better improved.

Example 2:

In this example, surface treatment is performed on the surfaces of the forging die and the forging part, so as to improve the service life of the forging die and reduce the wear between the forging die and the forging part.

For example, the processing method for the forging die in this example is:

The material of the forging die is DIVAR, the formula for the DIVAR solution is 20g/L of oxalic acid, 50g/L of sulfuric acid, and the other components are deionized water. The forging die made of DIVAR is immersed in a solution composed of oxalic acid, sulfuric acid and deionized water. , the surface of the forging die will form nano-scale pores.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution, wherein the immersion time is 15min, and the temperature of the acid solution is 65°C;

After the forging die is soaked, it is dried; the drying temperature is 75° C., and the drying time is 25 minutes.

After drying, the surface of the forging die has micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm, and a lubricant is applied to the surface of the micropores.

The inventors found that when the DIVAR was surface-treated with this solution formulation, micropores with uniform distribution and consistent structure could be formed on the surface, and the diameters of the micropores were all in the range of 20nm-400nm, and the depths were uniform. In the range of 20nm-400nm; apply lubricant on the surface after corrosion, the lubricant can be stored on the surface for a long time, and the lubricating performance of the surface is improved.

For example, the processing method of the forging in this example is:

The material of the forgings is TA2, the formula for the TA2 stainless steel solution is sulfuric acid 50g/L, hydrofluoric acid 20g/L, and other components are deionized water; the forgings made of TA2 are immersed in phosphoric acid, hydrofluoric acid and deionized water. In the solution composed of water, nano-scale pores will be formed on the surface of the forging.

The forgings are pretreated, and then the pretreated forgings are cleaned and dried;

Immerse the forging in the prepared acid solution, the temperature of the acid solution is 40℃, and the soaking time is 20min;

After the forging is soaked, it is dried; the drying temperature is 85°C, and the drying time is 15min;

After the drying is completed, the surface of the forged part obtains nano-scale micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm.

The inventors found that: when the material of the forging is suitable for hot forging, the surface treatment of the surface of the forging die and the surface of the forging is carried out simultaneously by using the surface treatment method of the present invention, the life of the forging die is increased by 20%, and the processing efficiency is increased by 20%. With an increase of 10%, the appearance of the forged product formed by the forging process is greatly improved.

According to Embodiment 1 and Embodiment 2, the method for surface treatment of a metal piece used in a forging process according to the present invention is applicable to forging processing in any technological manner, so the present invention is suitable for a metal piece used in a forging process. The method of surface treatment is applicable to a wide range.

Example 3:

In this example, only the surface of the forging die is surface-treated.

For example, the processing method for the forging die in this example is:

The material of the forging die is DC53. The formula of the acid solution for DC53 is oxalic acid 30g/L, sulfuric acid 60g/L, and other components are deionized water. The forging die made of DC53 is immersed in oxalic acid, sulfuric acid and deionized water. In the solution, nano-scale pores are formed on the surface of the forging die.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution, wherein the immersion time is 15min, and the temperature of the acid solution is 65°C;

After the forging die is soaked, it is dried; the drying temperature is 80° C. and the drying time is 20 minutes.

After drying, the surface of the forging die has micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm, and a lubricant is applied to the surface of the micropores.

The inventors of the present invention have found that, whether the material of the forging is suitable for cold forging, hot forging or warm forging, when only the surface of the forging die is surface-treated, the wear between the die and the forging can also be reduced, improving the efficiency of the forging. The service life of the mold; at the same time, it can also improve the aesthetics of the forged product to a certain extent. The surface treatment method of the present invention only performs surface treatment on the surface of the forging die, the life of the forging die is increased by 15%, the processing efficiency is increased by 10%, and the appearance effect of the forged product formed by the forging process is improved.

Example 4:

In this example, surface treatment is performed on the surfaces of the forging die and the forging part, so as to improve the service life of the forging die and reduce the wear between the forging die and the forging part.

For example, the processing method for the forging die in this example is:

The material of the forging die is carbon tool steel. For the carbon tool steel, the acid solution formula is 30g/L of nitric acid, 100g/L of hydrofluoric acid, and other components are deionized water. The material is forging of carbon tool steel. The mold is immersed in a solution of nitric acid, hydrofluoric acid and deionized water, and the surface of the forging mold will form micro- and nano-scale pores.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution. The immersion time is 15 minutes and the temperature of the acid solution is 50°C. In this example, the immersion time can be adjusted according to the solution temperature, for example, when the solution temperature is low , which can prolong the soaking time, so that the surface of the forging die can form a better microporous structure and improve the lubricating performance of the surface.

After the forging die is soaked, it is dried; the drying temperature is 75° C., and the drying time is 25 minutes.

After drying, the surface of the forging die obtains micropores with a diameter of 100 nm-20 μm and a depth of 100 nm-20 μm, and a lubricant is applied to the surface of the formed micropores.

For example, the processing method of the forging in this example is:

The material of the forging is No. 45 steel, the formula for the solution of No. 45 steel is hydrochloric acid 50g/L, boric acid 300g/L, and other components are deionized water; the forgings made of No. 45 steel are immersed in hydrochloric acid, boric acid and deionized water. In the solution composed of ionized water, micro- and nano-scale pores will be formed on the surface of the forging.

The forgings are pretreated, and then the pretreated forgings are cleaned and dried;

Immerse the forging in the prepared acid solution, the temperature of the acid solution is 80℃, and the immersion time is 8min;

The third step: after the forging is soaked and dried; the drying temperature is 80°C, and the drying time is 20min;

After the drying is completed, the surface of the forged part obtains micro-nano-scale pores with a diameter of 100 nm-20 μm and a depth of 100 nm-20 μm.

The inventors found that: by using the surface treatment method of the present invention to simultaneously perform surface treatment on the surface of the forging die and the surface of the forging piece, the life of the forging die is increased by 25%, and the processing efficiency is increased by 15%. The appearance of forged products is largely improved.

Example 5:

In this example, surface treatment is performed on the surfaces of the forging die and the forging part, so as to improve the service life of the forging die and reduce the wear between the forging die and the forging part.

For example, the processing method for the forging die in this example is:

The material of the forging die is GR. For GR, the formula of its solution is sulfuric acid 50g/L, gallic acid 100g/L, and other components are deionized water. The forging die made of GR is immersed in sulfuric acid, gallic acid and deionized water. In the solution, nano-scale pores will be formed on the surface of the forging die.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution, wherein the immersion time is 15min, and the temperature of the acid solution is 55°C;

After the forging die is soaked, it is dried; the drying temperature is 80° C. and the drying time is 20 minutes.

After drying, the surface of the forging die has micropores with a diameter of 100nm-800nm and a depth of 100nm-800nm, and a lubricant is applied to the surface of the micropores.

For example, the processing method of the forging in this example is:

The material of the forged parts is cast iron, the formula of the acid solution for the cast iron material is sulfuric acid 300g/L, and the other components are deionized water; the forged parts made of cast iron are immersed in the solution composed of sulfuric acid and deionized water, and the forging is carried out. The surface of the parts will form nano-scale pores.

The forgings are pretreated, and then the pretreated forgings are cleaned and dried;

Immerse the forging in the prepared acid solution, the temperature of the acid solution is 40℃, and the soaking time is 20min;

After the forging is soaked, it is dried; the drying temperature is 85°C, and the drying time is 15min;

After the drying is completed, the surface of the forged part obtains nano-scale pores with a diameter of 100nm-500nm and a depth of 100nm-500nm.

The inventors found that: by using the surface treatment method of the present invention to simultaneously perform surface treatment on the surface of the forging die and the surface of the forging piece, the life of the forging die is increased by 25%, and the processing efficiency is increased by 15%. The appearance of forged products is largely improved.

Example 6:

In this example, surface treatment is performed on the surfaces of the forging die and the forging part, so as to improve the service life of the forging die and reduce the wear between the forging die and the forging part.

For example, the processing method for the forging die in this example is:

The material of the forging die is high-speed steel. The acid solution formula for the high-speed steel is sulfuric acid 500g/L, and the other components are deionized water. The forging die made of high-speed steel is immersed in a solution composed of sulfuric acid and deionized water. Nanoscale pores are formed on the surface of the mold.

The forging die is pretreated, and then the pretreated forging die is cleaned and dried;

The parting surfaces of the upper and lower dies of the forging die are suspended upside down and immersed in the prepared acid solution, wherein the immersion time is 10min, and the temperature of the acid solution is 60°C;

After the forging die is soaked, it is dried; the drying temperature is 80° C. and the drying time is 20 minutes.

After drying, the surface of the forging die has micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm, and a lubricant is applied to the surface of the micropores.

For example, the processing method of the forging in this example is:

The material of the forgings is 316L stainless steel, the formula for the 316L stainless steel solution is phosphoric acid 300g/L, and the other components are deionized water; the forgings made of 316L stainless steel are immersed in a solution composed of phosphoric acid and deionized water. Nanoscale pores are formed on the surface.

The forgings are pretreated, and then the pretreated forgings are cleaned and dried;

Immerse the forging in the prepared acid solution, the temperature of the acid solution is 60℃, and the immersion time is 15min;

After the forging is soaked, it is dried; the drying temperature is 80°C, and the drying time is 20min;

After the drying is completed, the surface of the forged part obtains nano-scale micropores with a diameter of 20nm-400nm and a depth of 20nm-400nm.

The inventors found that: by using the surface treatment method of the present invention to simultaneously perform surface treatment on the surface of the forging die and the surface of the forging piece, the life of the forging die is increased by 25%, and the processing efficiency is increased by 15%. The appearance of forged products is largely improved.

Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are provided for illustration only and not for the purpose of limiting the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (9)

1. A method for surface treatment of a metal piece used in a forging process, characterized in that the method comprises the following steps: The acid solution is used to corrode the surface of the metal parts to form micropores on the surface of the metal parts; Dry the surface of the metal parts after corrosion treatment; A lubricant is applied to the surface of the metal part formed with the micropores, the lubricant is adsorbed in the micropores, and a lubricating film is formed on the surface of the metal part. 2 . The method for surface treatment of a metal piece used in a forging process according to claim 1 , wherein before the surface of the metal piece is subjected to corrosion treatment, the method further comprises: 3 . Pretreatment of the surface of metal parts; The surface of the pretreated metal parts is cleaned and dried. 3. The method for surface treatment of a metal part used in a forging process according to claim 1, wherein the surface corrosion treatment of the metal part with an acid solution comprises: immersing the surface of the metal part in the acid In the solution, the micropores with a diameter of 20 nm-40 μm and a depth of 20 nm-40 μm are formed on the surface of the metal piece. 4. The method for surface treatment of metal parts used in a forging process according to claim 1 or 3, wherein the acid solution comprises oxalic acid, sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, boric acid, formic acid, hydrogen One or more of hydrofluoric acid and gallic acid. 5. The method for surface treatment of metal parts used in a forging process according to claim 2, wherein the drying temperature range of the drying treatment is: 75°C to 85°C; the drying time is 15min～25min. 6. The method for surface treatment of metal parts used in a forging process according to claim 3, wherein the temperature range of the acid solution is: 40°C to 80°C; the soaking time range is: 1min- 20min. 7 . The method for surface treatment of metal parts used in a forging process according to claim 4 , wherein the acid solution comprises: 20 g/L of oxalic acid and 50 g/L of sulfuric acid. 8 . 8 . The method for surface treatment of metal parts used in a forging process according to claim 4 , wherein the acid solution comprises: 30 g/L of oxalic acid and 200 g/L of phosphoric acid. 9 . 9 . The method according to claim 4 , wherein the acid solution comprises: 50 g/L of sulfuric acid and 20 g/L of hydrofluoric acid. 10 .

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