TWI505881B - Method for improving the mold release effect of a metal casting mold - Google Patents

Description

Method for improving mold release effect of metal casting mold

The invention relates to a method for casting a metal solid, on the one hand, the effect of demolding a metal casting mold, and on the other hand, the performance of a metal solid obtained by casting.

"Founding" is a metal forming method that is quite common in industrial technology. Taking lead solids as an example, first, the lead block to be treated is heat-melted at a high temperature to obtain a molten lead solution. Next, a casting mold having a cavity is immersed in the molten lead liquid to fill the molten mold lead liquid in the mold cavity of the casting mold. Thereafter, the casting mold is taken out from the lead liquid and the molten lead liquid in the cavity of the casting mold is cooled to form a lead solid, and finally, the lead solid is released from the cavity of the casting mold. However, when the lead solids are taken out of the mold, it is often difficult to release the lead solids from the mold cavity of the casting mold. Therefore, before using the casting mold, another release agent is sprayed on the surface of the mold cavity of the casting mold, which is generally common. The dosage form is boron, boron nitride, eucalyptus oil or other equivalent volatile liquid.

In the past, the release agent was sprayed on the surface of the mold cavity of the casting mold. Therefore, the adhesion formed between the release agent and the surface of the mold cavity of the casting mold was rather weak. When the lead solid was taken out of the mold, the release agent would follow. Lead solids are stripped from the mold cavity of the casting mold and may even be contaminated with lead solids. After repeated use, the surface of the mold cavity of the casting mold may have no residual release agent and must be re-sprayed. Moreover, after spraying the release agent on the surface of the mold cavity of the casting mold multiple times, the shape and size of the mold cavity of the casting mold will be different, and the shape and size of the lead solid cannot be normalized. In addition, the release agent is contaminated with lead solids, and the performance of lead solids will be affected. For example, when lead solids are used in lead storage batteries, the resistance of lead solids will rise, thus reducing the electrical performance of lead storage batteries.

For the sake of the job, design a method to improve the release effect of the metal casting mold, so that the release agent It is not easy to peel off from the casting mold, and the metal solid obtained by casting is not contaminated with the release agent, and does not affect the performance of the metal solid obtained by casting, and is a concern of the person or industry involved in metal casting.

The object of the present invention is to provide a method for improving the release effect of a metal casting mold, which enhances the adhesion formed between the release agent and the casting mold, thereby overcoming the conventional generation of the release agent in the mold cavity of the casting mold. Missing.

Accordingly, in order to achieve the foregoing and/or other objects, the present invention provides a method of casting a metal solid comprising the steps of: plating a release agent layer on a surface of at least one cavity of a casting mold; injecting a to-be-processed The molten metal liquid is in the cavity of the casting mold; the molten metal liquid in the cavity of the casting mold is cooled to solidify into a metal solid; and the metal solid is taken out from the cavity of the casting mold.

According to the present invention, since the release agent layer is the surface of the cavity which is plated on the casting mold, the adhesion formed between the release agent layer and the surface of the cavity of the casting mold is enhanced, so that the release agent layer is not easily cast. The cavity of the mold is peeled off, and the metal solids taken out of the mold are not contaminated with the release agent layer, thereby exerting the maximum performance of the metal solid.

To make the above and/or other objects, functions and features of the present invention more comprehensible, the following detailed description of the preferred embodiments.

In a preferred embodiment of the invention, a method of casting a metal solid is presented.

First, a casting mold is prepared, the casting mold having at least one cavity, each cavity having a surface. The material of the casting mold can be but not limited to: pig iron, alloy steel, carbon steel or stainless steel (such as SUS-304 stainless steel, SUS-310 stainless steel).

Next, a release agent layer is plated on the surface of the mold cavity of the casting mold. The release agent layer may have a thickness of from 10 nm to 100 μm, preferably from 1 μm to 100 μm. The release agent layer can be a tantalum layer, a boron layer, a tantalum nitride layer, a boron nitride layer, or any combination thereof. In one embodiment, the release agent layer is a tantalum layer, a boron layer, a tantalum nitride layer or a boron nitride layer. In another embodiment, the release agent layer may be a tantalum layer and a tantalum nitride layer, such as a tantalum layer and a tantalum nitride layer. In still another embodiment, the release agent layer may be a boron layer and a boron nitride layer, such as a boron plating layer and a boron nitride layer. The release agent layer may be a surface that is plated on the cavity of the casting mold by chemical vapor deposition (CVD) or physical vapor deposition (PVD). Those skilled in the art will appreciate that chemical vapor deposition or physical vapor deposition can be used to design different reaction conditions for different release agent layers. When a tantalum layer or a tantalum nitride layer is plated, in the case of chemical vapor deposition, a reaction gas containing hydrogen gas and a helium-containing gas is used, and the helium-containing gas is, for example, trimethylsilane or tetramethyl. Tetramethylsilane, etc.; in the physical vapor deposition method, a target containing cerium and cerium nitride is used, and a reaction gas containing a cerium-containing gas, nitrogen gas, and argon gas, for example, a cerium-containing gas, for example, is used. It is trimethyl decane, tetramethyl decane, etc. When a boron layer or a boron nitride layer is plated, in the case of chemical vapor deposition, a reaction gas containing hydrogen gas and a boron-containing gas is used, wherein the boron-containing gas is, for example, diborane or the like; In the physical vapor deposition method, a target containing boron and boron nitride is used, and a reaction gas containing a boron-containing gas, nitrogen gas, and argon gas is used, and the boron-containing gas is, for example, diborane.

Then, the molten metal liquid is injected into the cavity of the casting mold, for example, the casting mold is directly immersed in the molten metal liquid. It should be noted that the casting mold and the release agent layer are melted. The metal liquid cannot melt or chemically react, otherwise it will affect the efficacy of the present invention. Therefore, the source of the molten metal liquid must be carefully selected, preferably the melting point is lower than the melting point of the casting mold and the release agent layer. A metal or alloy that chemically reacts with the release agent layer, such as gold, silver, copper, tin, aluminum, zinc, lead, or an alloy of any combination of such metals, but is not limited thereto.

Thereafter, the molten metal liquid in the cavity of the casting mold is cooled to solidify into a metal solid. For example, the molten metal liquid in the cavity of the casting mold can be cooled by means of natural cooling, rapid cooling or wind blowing.

Finally, the metal solid is taken out from the cavity of the casting mold.

The invention is illustrated in the following detailed description of the invention, but is not intended to be limited to the details disclosed herein.

<Specific example 1>

First, a stainless steel casting mold is taken, and the casting mold has a plurality of cavities, each of which has a surface.

Next, prepare four water tanks, numbered 1-4, respectively, in which the first and second tanks are filled with surfactant solution and control the solution temperature at about 50 degrees. The tanks No. 3 and No. 4 are equipped with deionized water and control the water temperature. About 80 degrees. The casting mold is immersed in each sink in the order of the sink number and ultrasonically oscillated for 15-20 minutes to remove grease or organic compounds on the casting mold, and then the casting mold is moved to an oven to dry the casting mold.

Then, a boron nitride layer is plated by a physical vapor deposition method on the dried casting mold, and the physical vapor deposition method is as follows: First, the casting mold is placed in the preliminary cavity, and the mechanical pump is prepared. The cavity is evacuated to a pressure of 5×10 ^-2 torr in the chamber; secondly, the casting mold is moved to the main cavity, and the heater is turned on to heat the main cavity to 100 ° C and held for 30 minutes to remove the casting mold. (outgassing) treatment; third, after drying the casting mold, argon gas is introduced into the main cavity to maintain the pressure in the chamber 1×10 ^-2 torr; fourth, open the RF power source or DC power source to ignite the plasma to nitrogen The boron target is pre-sputtered to clean impurities and oxides on the target; fifth, a reaction gas containing nitrogen and argon is introduced to control the flow rate of the reaction gas, and the pressure valve is controlled to maintain the main cavity. In-cavity pressure; sixth, the power supply is raised to the required power. After the plasma is stabilized, the baffle is removed to sputter the casting mold; and seventh, after the sputtering is completed, the casting mold is cooled by natural cooling. Eighth, moving the casting mold from the main cavity to the pre- The inside of the chamber is filled with nitrogen gas to remove the vacuum from the preliminary cavity, and the cast mold after sputtering is taken out.

Then, the sputtered casting mold is immersed in the molten lead liquid, and the molten lead liquid is injected into the mold cavity of the casting mold.

Then, the casting mold is taken out from the molten lead liquid and the molten lead liquid in the cavity of the casting mold is cooled by natural cooling to solidify into a lead solid.

Finally, the lead solids were taken out from the cavity of the casting mold.

<Specific example 2>

The lead solid of Specific Example 2 was obtained by the procedure described in the specific example 1, except that the boron nitride layer was plated by a chemical vapor deposition method on the dried casting mold, and the steps of the chemical vapor deposition method were as follows: First, the casting mold is placed in the preliminary cavity, and the preliminary cavity is evacuated to a pressure of 5×10 ^-2 torr by a mechanical pump; second, the casting mold is moved to the main cavity, and the heater is turned on. The main cavity is heated to 100 ° C and held for 30 minutes to perform outgassing treatment on the casting mold. Third, after the casting mold is dried, hydrogen (30 sccm) and ethane boron (150 sccm) are introduced. the reaction gas, and the pressure regulator valve to increase the pressure chamber of the main cavity of 2 × 10 ^-2 torr and the holding pressure; fourth, turn on the heater to the main cavity 500 ℃, RF power is turned on (power 2000W) ignited The plasma is deposited on the casting mold; fifthly, after the deposition of the coating is completed, the casting mold is cooled by natural cooling; sixth, the casting mold is moved from the main chamber to the preliminary chamber, and a nitrogen gas is introduced into the preparation chamber. The body is broken by vacuum, and the casting after deposition of the coating is taken out. Molding.

<Comparative example>

The lead solid of the comparative example was obtained by the procedure described in the specific example 1, except that the boron nitride layer was sprayed on the dried casting mold.

<Analysis example>

Please refer to the first to third figures, which are photographs of lead solids obtained in Specific Examples 1, 2 and Comparative Examples, respectively. After comparing these patterns, it can be clearly seen that the surface of the lead solid obtained in the specific examples 1 and 2 is flat, and the surface of the lead solid obtained in the comparative example is uneven, indicating that the specific examples 1 and 2 are obtained. The lead solids were not contaminated with a boron nitride layer, and the lead solids obtained in the comparative example were contaminated with a boron nitride layer.

In addition, the lead solids obtained in the specific examples 1, 2 and the comparative examples were measured using an electric meter, and resistance values of 0.02 ohm, 0.02 ohm, and 11,560,000 ohm were respectively obtained, and it is said that in addition to the difference in surface characteristics, the specific examples 1, 2, and comparison are shown. The lead solids obtained in the examples also differ in electrical performance.

In summary, the method for casting a metal solid according to the present invention is formed by plating a release agent layer on the surface of a cavity of a casting mold to strengthen the surface between the release agent layer and the surface of the mold cavity of the casting mold. The adhesion makes the release agent layer not easily peeled off from the cavity of the casting mold, and the metal solids taken out of the mold release are not contaminated with the release agent layer, thereby exerting the maximum performance of the metal solid.

Obviously, many modifications and differences may be made to the invention in light of the above description. It is therefore to be understood that within the scope of the appended claims, the invention may be The above is only preferred of the present invention. The examples are not intended to limit the scope of the invention, and all equivalent modifications or modifications may be made without departing from the spirit of the invention.

The first figure is a photographic view of the lead solid obtained in Specific Example 1.

The second figure is a photographic view of the lead solid obtained in Specific Example 2.

The third figure is a photographic image of the lead solid obtained in the comparative example.

Claims (9)

A method for casting a metal solid consists of: coating a release agent layer on a surface of at least one cavity of a casting mold, the release agent layer being a bismuth layer, a boron layer, and a nitridation layer a layer of germanium, a layer of boron nitride or any combination thereof; injecting a molten metal liquid to be treated into a cavity of the casting mold; cooling the molten metal liquid in the cavity of the casting mold to solidify The metal solid; and the metal solid is removed from the cavity of the casting mold. The method of claim 1, wherein the release agent layer has a thickness of from 10 nm to 100 μm. The method of claim 1, wherein the release agent layer is plated by the chemical vapor deposition (CVD) or physical vapor deposition (PVD). The surface of the mold cavity. The method of claim 1, wherein the tantalum layer or the tantalum nitride layer is plated on the surface of the mold cavity of the casting mold by chemical vapor deposition, and the chemical vapor deposition method is used. Hydrogen and a reaction gas containing helium gas. The method of claim 1, wherein the tantalum layer or the tantalum nitride layer is plated on the surface of the mold cavity of the casting mold by physical vapor deposition, and the physical vapor deposition method comprises A target containing a ruthenium compound and a reaction gas containing a ruthenium-containing gas, nitrogen gas, and argon gas. The method of claim 1, wherein the boron layer or the boron nitride layer is plated on the surface of the mold cavity of the casting mold by chemical vapor deposition, and the chemical vapor deposition method is used. A reaction gas containing hydrogen and a boron-containing gas. The method of claim 1, wherein the boron layer or the boron nitride layer is plated on the surface of the mold cavity of the casting mold by physical vapor deposition, and the physical vapor deposition method comprises A target of boron and a boron-containing compound, and a reaction gas containing a boron-containing gas, nitrogen gas, and argon gas. The method of claim 1, wherein the casting mold is made of pig iron, alloy steel, carbon steel or stainless steel. The method of claim 1, wherein the source of the molten metal liquid is gold, silver, copper, tin, aluminum, zinc, lead or an alloy of any combination of the metals.