Film coating method for prolonging service life of mold

Abstract

The invention discloses a coating method for prolonging the service life of a mold. The coating method comprises the following steps: 1) cleaning the mold; 2) drying the mold; and (3) the DLC coating is prepared on the surface of the mold through a magnetron sputtering method. The problem that the surface of the die is scratched can be effectively solved, the problem of oxidation of the surface of the die can be reduced, the service life of the die can be prolonged, and the cost of product machining and production is greatly reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of molds, and particularly relates to a coating method for increasing the service life of molds. Background Art

[0002] In the process of implementing the present invention, the inventor found that the prior art has at least the following problems:

[0003] With the rapid development of the industry, consumers have higher and higher requirements for products. In order to improve the quality and productivity of products, mold-based operations have become an important consideration. Therefore, the accuracy and quality of molds directly affect the processing of products. Due to the relatively high costs of mold opening and maintenance, how to increase the service life of molds, improve the surface accuracy of molds, and reduce the later maintenance costs of molds has become one of the important goals in the production and development of mold users and manufacturers.

[0004] The currently used graphite molds are not coated on the surface. Since it is impossible to achieve a completely oxygen-free state in the cavity of the hot bending equipment, the carbon element in the mold and the oxygen element in the cavity are extremely likely to undergo an oxidation reaction under high-temperature usage environments.

[0005] CN118186356A - A mold coating device, discloses a mold coating device, including a coating member for coating the mold and a cleaning member for cleaning the mold. The cleaning member includes a water storage member with a water storage cavity formed at the top. One side of the water storage member is provided with a water delivery member for delivering water. Inside the water storage cavity, there is an annular pipe connected to the water outlet end of the water delivery member. The inner wall of the annular pipe is fixedly connected with a plurality of spray heads in an annular array. Inside the water storage cavity, there is a support member that moves up and down relative to the water storage cavity. Because it cannot solve the above technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a coating method for increasing the service life of molds, which can effectively solve the problem of mold surface scratches, reduce the oxidation problem on the mold surface, increase the service life of the mold, and greatly reduce the costs of product processing and production.

[0007] To solve the above technical problem, the technical solution adopted by the present invention is: A coating method for increasing the service life of molds, including the following steps:

[0008] 1) Clean the mold; 2) Dry the mold; 3) Prepare a DLC coating on the surface of the mold by magnetron sputtering.

[0009] In the above step 1), first, clean the mold to remove surface dirt and oxides; then immerse the mold in a chemical cleaning solution; then rinse it with tap water, soak it in ammonia water, rinse it with tap water again, soak it in deionized water, and finally soak it in anhydrous ethanol for dehydration.

[0010] In the above step 1), rinse with tap water for 5 min to 50 min, soak in ammonia water with a concentration of 1% to 10%, rinse with tap water again, and then soak in deionized water twice.

[0011] In the above step 2), dry the mold by heating it in an oven to a temperature of 50°C to 200°C or by blowing hot air.

[0012] In the above step 3), continuously shoot the graphite target with Ar+ excited by a radio frequency device or a magnetic field to excite C atoms, and finally prepare a DLC coating on the surface of the graphite substrate.

[0013] In the above step 3), coating parameters: bias voltage -50 to -200 V, sputtering time 30 to 70 min, pressure 5x10 ˉ3 ~50x10 ˉ3 Pa.

[0014] In the above step 3), before preparing the DLC coating on the surface of the mold, deposit Cr and WC on the surface of the mold as a transition layer.

[0015] In the above step 3), deposition power 5 to 10 kW, deposition times of Cr and WC are 10 to 30 min and 60 to 100 min respectively, and finally introduce C2H2 gas.

[0016] In the above step 3), the pressure in the cavity during deposition is 2x10 ˉ1 ~5x10 ˉ1 Pa, deposition temperature is 100°C to 200°C, and the film thickness is between 450 and 1000 nm.

[0017] One of the technical solutions in the above technical solution has the following advantages or beneficial effects: it can effectively solve the problem of surface scratches on the mold, reduce the oxidation problem on the surface of the mold, increase the service life of the mold, and greatly reduce the product processing and production costs. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the coating method for increasing the service life of the mold provided in the embodiment of the present invention;

[0019] Figure 2 For Figure 1 the schematic diagram of the coating method for increasing the service life of the mold; Detailed Description of the Invention

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] Embodiment 1

[0022] See Figures 1-2 , a coating method for increasing the service life of a mold, comprising the following steps: 1) cleaning the mold; 2) drying the mold; 3) preparing a DLC coating on the surface of the mold by means of magnetron sputtering. It can effectively solve the problem of surface scratches of the mold, reduce the oxidation problem on the surface of the mold, and increase the service life of the mold, greatly reducing the cost of product processing and production.

[0023] In the above step 1), first perform a cleaning treatment on the mold to remove dirt and oxides on the surface; then immerse the mold in a chemical cleaning solution; then rinse it with tap water, soak it in ammonia water, rinse it with tap water again, then immerse it in deionized water, and finally soak it in anhydrous ethanol for dehydration. Advantages: Thoroughly remove impurities and oxides on the surface of the mold, effectively increase the adhesion of the mold surface, and the service life of the mold.

[0024] In the above step 1), rinse with tap water for 5 min to 50 min, then soak in ammonia water with a concentration of 1% to 10%, rinse with tap water again, and then immerse in deionized water twice. Advantages: Soaking in ammonia water can neutralize the acidic substances remaining on the surface of the mold, prevent corrosion, react with metal oxides to remove impurities, and play a role in cleaning and protection. Then rinse with tap water to further remove the remaining ammonia water and impurities, ensuring the cleanliness of the mold surface.

[0025] In the above step 2), heat the mold in a drying oven to a temperature of 50°C to 200°C for drying or blow-dry the mold with hot air. Advantages: Remove the moisture in the mold material, making the mold not easily deformed during use.

[0026] In the above step 3), continuously shoot the graphite target with Ar+ excited by a radio frequency device or a magnetic field to excite C atoms, and finally prepare a DLC coating on the surface of the graphite substrate with C ions. Advantages: The prepared coating has high hardness, low friction coefficient, good chemical stability, optical transparency, high deposition rate and uniformity, and can reduce particle contamination, etc.

[0027] In the above step 3), coating parameters: bias voltage -50 to -200 V, sputtering time 30 to 70 min, pressure 5x10ˉ3 ~50x10 ˉ3 Pa. Advantage: It makes it easier to reach the substrate surface and deposit a film, thereby increasing the deposition rate.

[0028] In the above step 3), before preparing the DLC coating on the mold surface, Cr and WC are deposited on the mold surface as a transition layer. Advantage: It enhances the adhesion of the film layer and makes the film layer not easy to fall off.

[0029] In the above step 3), the deposition power is 5 - 10 kW, the deposition times of Cr and WC are 10 - 30 min and 60 - 100 min respectively, and finally C2H2 gas is introduced. Advantage: Depositing the Cr-WC transition layer can construct a gradient structure, effectively relieve stress concentration, and improve the crack resistance and overall performance of the film layer. Introducing CH gas is conducive to generating a more uniform and dense DLC layer, reducing film layer defects and pores, and improving the surface quality of the film layer.

[0030] In the above step 3), the pressure in the cavity during deposition is 2x10 ˉ1 ~5x10 ˉ1 Pa, the deposition temperature is 100 °C - 200 °C, and the film layer thickness is between 450 - 1000 nm. Advantage: It is conducive to the uniform distribution of gaseous substances in the cavity, promotes the stable arrival of deposition particles on the mold surface, ensures uniform film layer deposition, and helps to form a film layer structure with stable quality.

[0031] This method can effectively improve the service life of the graphite mold in an environment of about 600 °C. The DLC film layer plated by this technology has a high hardness and a low friction coefficient, which not only makes the mold surface smoother but also can greatly reduce scratches on the mold surface.

[0032] Depositing a DLC film layer (diamond-like carbon film layer) on the graphite mold surface. DLC is an amorphous metastable substance with the characteristics of both diamond and graphite, and most of the C atoms exist in the form of sp2 and sp3 hybrid bonds. The DLC coating not only has the ultra-high hardness and extremely excellent chemical stability of diamond but also has the ultra-low friction coefficient characteristics of graphite. It can effectively solve the problem of mold surface scratches, reduce the oxidation problem on the mold surface, increase the service life of the mold, and greatly reduce the product processing and production costs.

[0033] After adopting the above solution, it can effectively solve the problem of mold surface scratches, reduce the oxidation problem on the mold surface, increase the service life of the mold, and greatly reduce the product processing and production costs.

[0034] Example 2

[0035] A coating method for increasing the service life of a graphite mold, and the main manufacturing method is as follows:

[0036] The first process: Before coating the mold, it is necessary to first perform a cleaning treatment to remove surface dirt and oxides, then immerse it in a chemical cleaning solution, then rinse it with tap water for 5 min to 50 min, then soak it in ammonia water with a concentration of 1% to 10% to achieve a neutralization effect. After rinsing with tap water, it is immersed in deionized water twice, and finally soaked in anhydrous ethanol for dehydration, and then dried in an oven at a temperature of 50°C to 200°C or dried with hot air.

[0037] The second process: Prepare a DLC coating by magnetron sputtering. This method is also one of the relatively common methods for preparing DLC coatings at present (the advantage of this process is that the preparation efficiency is relatively high and the coating density is relatively good). Continuously shoot the graphite target with Ar+ excited by a radio frequency device or a magnetic field, and excite C atoms and C ions to finally prepare a DLC coating on the surface of the graphite substrate. The main coating parameters are: bias voltage -50 to -200 V, sputtering time 30 to 70 min, pressure 5x10 ˉ3 ~50x10 ˉ3 Pa. In order to increase the bonding between the DLC layer and the graphite mold, it is necessary to deposit Cr and WC on the mold surface as a transition layer. The transition layer greatly increases the bonding force between the mold surface and the DLC film layer, making the film layer not easy to fall off. The deposition power is 5 to 10 kW, and the deposition times are 10 to 30 min and 60 to 100 min respectively. Finally, C2H2 gas is introduced, and the pressure in the cavity during deposition is 2x10 ˉ1 ~5x10 ˉ1 Pa, the deposition temperature is 100°C to 200°C, the deposition time is 100 to 180 min, and the film layer thickness is between 450 and 1000 nm.

[0038] A DLC film layer with high temperature resistance, low friction coefficient and high hardness can be obtained on the surface of the graphite mold. This method can effectively improve the service life of the graphite mold in an environment of about 600°C. The DLC film layer plated by this technology has high hardness and low friction coefficient, which not only makes the mold surface smoother but also can greatly reduce the scratches on the mold surface.

[0039] Deposit a DLC film layer (diamond-like carbon film layer) on the surface of the graphite mold. DLC is an amorphous metastable substance with both the characteristics of diamond and graphite, and most of the C atoms exist in the form of sp2 and sp3 hybrid bonds. The DLC coating not only has the ultra-high hardness and extremely excellent chemical stability of diamond but also has the ultra-low friction coefficient characteristics of graphite. It can effectively solve the problem of scratches on the mold surface, reduce the oxidation problem on the mold surface, increase the service life of the mold, and greatly reduce the production cost of product processing.

[0040] After adopting the above solution, it can effectively solve the problem of mold surface scratching, reduce the oxidation problem of the mold surface, increase the service life of the mold, and greatly reduce the cost of product processing and production.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention.

[0042] In the present invention, unless otherwise clearly defined and limited, the terms "installation", "setting", "connection", "fixation", "swivel connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coating method for increasing the service life of a mold, characterized in that, It includes the following steps: 1) Clean the mold; 2) Dry the mold; 3) Prepare a DLC coating on the surface of the mold by magnetron sputtering method.

2. The coating method for increasing the service life of a mold according to claim 1, characterized in that, In the above step 1), first perform a cleaning treatment on the mold to remove dirt and oxides on the surface; then immerse the mold in a chemical cleaning solution; then rinse it with tap water, then soak it in ammonia water, then rinse it with tap water again, then immerse it in deionized water, and finally soak it in anhydrous ethanol for dehydration.

3. The coating method for increasing the service life of a mold according to claim 2, characterized in that, In the above step 1), rinse with tap water for 5 min to 50 min, then soak in ammonia water with a concentration of 1% to 10%, then rinse with tap water, and then immerse in deionized water twice.

4. The coating method for increasing the service life of a mold according to claim 3, characterized in that, In the above step 2), dry the mold by heating it to a temperature of 50°C to 200°C in a drying oven or by blowing hot air.

5. The coating method for increasing the service life of a mold according to claim 4, characterized in that In the above step 3), continuously shoot the graphite target with Ar+ excited by a radio frequency device or a magnetic field to excite C atoms, and finally prepare a DLC coating on the surface of the graphite substrate.

6. The coating method for increasing the service life of a mold according to claim 5, characterized in that, In the above step 3), coating parameters: bias voltage -50 to -200 V, sputtering time 30 to 70 min, pressure 5x10ˉ3 to 50x10ˉ3 pa.

7. The coating method for increasing the service life of a mold according to claim 6, characterized in that, In the above step 3), before preparing the DLC coating on the surface of the mold, deposit Cr and WC on the surface of the mold as a transition layer.

8. The coating method for increasing the service life of a mold according to claim 7, characterized in that, In the above step 3), deposition power is 5 to 10 kw, the deposition times of Cr and WC are 10 to 30 min and 60 to 100 min respectively, and finally introduce C2H2 gas.

9. The coating method for increasing the service life of a mold according to claim 8, characterized in that, In the above step 3), during deposition, the pressure in the cavity is 2x10 ˉ1 ~5x10 ˉ1 Pa, the deposition temperature is 100°C to 200°C, and the film thickness is between 450 and 1000 nm.

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