A fully coated tungsten carbide production process, screw and barrel

Abstract

The present application relates to the field of screw processing technology and discloses a fully coated tungsten carbide production process, which includes the following steps: Step 1, raw material preparation: tungsten powder and carbon powder are mixed as raw materials; Step 2, wet ball milling: the mixed raw materials are placed in a ball mill together with an appropriate amount of ball milling media for wet ball milling. During the ball milling process, the raw material particles will be ground into finer powders, and the ball milling media will play a mixing role; Step 3, drying: the mixed powder obtained by wet ball milling is dried to remove moisture. Through the wet ball milling and coating process, the raw material powders can be mixed more evenly, and the coating agent can be evenly covered on the powder surface, thereby improving the uniformity and consistency of the product. Through ball milling and screening and other processes, the particle size of the tungsten carbide powder can be controlled to meet the powder particle size requirements of different applications.

Description

Technical Field

[0001] The present invention relates to the technical field of screw processing, in particular to a fully-enclosed tungsten carbide production process, a screw and a barrel. Background Art

[0002] Tungsten carbide is an important engineering material with high hardness, high melting point and excellent wear resistance. Therefore, it is widely used in tool manufacturing, such as drills, milling cutters, blades, etc. Tungsten carbide powder is a form of tungsten carbide material. Tungsten carbide powder can be mixed with other materials (such as metal powder) and applied to surface coatings through methods such as thermal spraying. These coatings have wear resistance, corrosion resistance and high temperature performance, and can be used to enhance the hardness and durability of the workpiece surface.

[0003] Traditional tungsten carbide production processes have shortcomings in terms of uniformity, particle size control, agglomeration, impurities, and process flow. These issues can affect the quality and performance of screws coated with tungsten carbide. Therefore, inventors in this field have proposed a fully coated tungsten carbide production process, polyethylene screw, and barrel to address these issues. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a fully enclosed tungsten carbide production process, screw and barrel, which solves some of the shortcomings of the traditional tungsten carbide production process in terms of uniformity, particle size control, accumulation and agglomeration, impurities and process flow.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A fully coated tungsten carbide production process comprises the following steps:

[0006] Step 1: Raw material preparation: Mix tungsten powder and carbon powder as raw materials;

[0007] Step 2, wet ball milling: Place the mixed raw materials and an appropriate amount of ball milling media into a ball mill for wet ball milling. During the ball milling process, the raw material particles will be ground into finer powders, and the ball milling media will play a mixing role;

[0008] Step 3: Drying: Drying the mixed powder obtained by wet ball milling to remove moisture;

[0009] Step 4: Adding coating agent: Adding coating agent to the dried mixed powder. The coating agent improves the fluidity and stability of the powder and also helps in the subsequent coating process.

[0010] Step 5: Coating: Place the mixed powder after adding the coating agent into the coating machine for coating, and evenly cover the coating agent on the powder surface by spraying;

[0011] Step 6: Drying and sintering: The coated powder is dried again to remove the solvent in the coating agent, and then the powder is sintered to combine the particles to form solid tungsten carbide;

[0012] Step 7: Powder processing: The sintered tungsten carbide block objects need to be crushed, screened and classified to obtain tungsten carbide powder that meets the requirements.

[0013] Preferably, in step S1, the mixing ratio of tungsten powder and carbon powder as raw materials is 1:1.

[0014] Preferably, in step S2, the ball milling medium is steel balls, which are made of carbon steel or alloy steel and have the characteristics of high hardness and good wear resistance.

[0015] Preferably, in step S4, the coating agent is graphite, which is a natural substance in the form of carbon and has good high-temperature stability and chemical inertness. It reacts with tungsten powder at high temperature to form a surface coating layer of tungsten carbide particles.

[0016] Preferably, in the step S6, the coated powder is sintered, and the sintering temperature is usually between 2500° C. and 2800° C., and the sintering time is controlled within 3 hours.

[0017] Preferably, the powder processing specifically comprises the following steps:

[0018] Step 7-1, Powder cooling: After sintering, the powder is usually in a high temperature state. Place the high temperature powder in a freezer to accelerate cooling and reduce the cooling time;

[0019] Step 7-2, powder crushing: The sintered powder may form lumps or agglomerates, which can be crushed using a grinder to restore them to granular form;

[0020] Step 7-3, particle size classification: Use a screening machine to classify the powder according to product requirements;

[0021] Step 7-4, surface treatment: pickling the powder again to improve the surface properties of the powder and adapt to the requirements of subsequent processes;

[0022] Step 7-5, product preparation: According to specific needs, the treated powder is heat-treated and dried to finally obtain the desired tungsten carbide product.

[0023] Preferably, a screw, the surface of which is coated with the fully-enclosed tungsten carbide according to any one of claims 1 to 6, comprises a rod body, and the front and rear ends of the rod body are fixedly connected to connecting parts.

[0024] Preferably, a barrel, inside which a polyethylene screw as claimed in claim 7 is installed, comprises a barrel body, a mounting groove is opened in the middle of the barrel body, two rod bodies are rotatably connected inside the mounting groove, and the bottom end of the barrel body is fixedly connected to a mounting plate.

[0025] The present invention provides a fully encapsulated tungsten carbide production process, polyethylene screw and barrel.

[0026] Beneficial effects:

[0027] 1. The present invention can make the raw material powder more evenly mixed through the wet ball milling and coating process, and the coating agent can be evenly covered on the powder surface, thereby improving the uniformity and consistency of the product.

[0028] 2. The present invention can control the particle size of tungsten carbide powder through ball milling and screening to meet the requirements of powder particle size for different applications.

[0029] 3. The present invention can improve the density and uniformity of tungsten carbide products through the full-coating process, so that it has better wear resistance, corrosion resistance and mechanical properties, and extends the service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A perspective view of the present invention;

[0031] Figure 2 Schematic diagram of the rod body of the present invention.

[0032] Among them, 1. barrel; 2. mounting groove; 3. mounting plate; 4. rod body; 5. connecting piece. DETAILED DESCRIPTION

[0033] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1:

[0035] The embodiment of the present invention provides a fully coated tungsten carbide production process, comprising the following steps:

[0036] Step 1: Raw material preparation: tungsten powder and carbon powder are mixed as raw materials, and the mixing ratio of tungsten powder and carbon powder as raw materials is 1:1;

[0037] Step 2, wet ball milling: The mixed raw materials are placed in a ball mill together with an appropriate amount of ball milling media for wet ball milling. During the ball milling process, the raw material particles will be ground into finer powders, and the ball milling media will play a mixing role. The ball milling media uses steel balls, which are made of carbon steel or alloy steel and have high hardness and good wear resistance. Through the wet ball milling process, the friction and impact of the ball milling media are used to grind the raw material particles into finer powders, and the ball milling media plays a mixing role, thereby improving the uniformity of the raw materials.

[0038] Step 3: Drying: Dry the mixed powder obtained by wet ball milling to remove moisture to prevent agglomeration and accumulation in subsequent steps;

[0039] Step 4, coating agent addition: Add coating agent to the dried mixed powder. The coating agent improves the fluidity and stability of the powder and also helps the subsequent coating process. The coating agent is graphite. Graphite is a natural carbon substance with good high temperature stability and chemical inertness. It reacts with tungsten powder at high temperature to form a surface coating layer of tungsten carbide particles.

[0040] Step 5: Coating: Place the mixed powder after adding the coating agent into the coating machine for coating, and evenly cover the coating agent on the powder surface by spraying;

[0041] Step 6: Drying and sintering: The coated powder is dried again to remove the solvent in the coating agent, and then the powder is sintered to combine the particles to form solid tungsten carbide. The coated powder is sintered at a temperature of 2500°C to 2800°C for 3 hours.

[0042] Step 7: Powder processing: The sintered tungsten carbide block objects need to be crushed, screened and classified to obtain tungsten carbide powder that meets the requirements.

[0043] Powder processing specifically includes the following steps:

[0044] Step 7-1, Powder cooling: After sintering, the powder is usually in a high temperature state. Place the high temperature powder in a freezer to accelerate cooling and reduce the cooling time;

[0045] Step 7-2, powder crushing: The sintered powder may form lumps or agglomerates, which can be crushed using a grinder to restore them to granular form;

[0046] Step 7-3, particle size classification: Use a screening machine to classify the powder according to product requirements;

[0047] Step 7-4, surface treatment: pickling the powder again to improve the surface properties of the powder and adapt to the requirements of subsequent processes;

[0048] Step 7-5, product preparation: according to specific needs, the treated powder is heat treated and dried to finally obtain the required tungsten carbide products

[0049] Example 2:

[0050] An embodiment of the present invention provides a screw, including a screw having a surface coated with fully coated tungsten carbide as in the first embodiment, including a rod body 4, the front and rear ends of the rod body 4 being fixedly connected to connectors 5, and the screw can also be a polyethylene screw. The screw preparation includes the following steps:

[0051] S1. Screw surface treatment: Clean and pickle the screw surface to remove impurities and oil stains and provide good adhesion;

[0052] S2. Electrostatic adsorption: Coat the surface of the screw with a layer of electrostatic adsorbent to give it a static charge, enabling it to adsorb tungsten carbide powder;

[0053] S3. Preparation of tungsten carbide coating: Spray tungsten carbide powder evenly on the surface of the screw with static charge. The tungsten carbide powder will be adsorbed on the surface of the screw by the static charge to form a uniform coating;

[0054] S4. Ultraviolet curing: Use ultraviolet lamp to irradiate the screw after electrostatic adsorption, and use the energy of ultraviolet light to solidify the tungsten carbide powder on the surface of the screw. This method has a fast curing speed.

[0055] Example 3:

[0056] An embodiment of the present invention provides a barrel, in which a screw as described in Example 2 is installed, including a barrel body 1, a mounting groove 2 is opened in the middle of the barrel body 1, two rod bodies 4 are rotatably connected inside the mounting groove 2, and a mounting plate 3 is fixedly connected to the bottom end of the barrel body 1. Tungsten carbide has excellent hardness and wear resistance, and can resist the wear and impact of abrasive particles during high-speed rotation inside the barrel. Coating the surface of the screw can improve its wear resistance and extend its service life.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. The fully coated tungsten carbide production process is characterized by: The following steps are involved: Step 1: Raw material preparation: Mix tungsten powder and carbon powder as raw materials; Step 2, wet ball milling: Place the mixed raw materials and an appropriate amount of ball milling media into a ball mill for wet ball milling. During the ball milling process, the raw material particles will be ground into finer powders, and the ball milling media will play a mixing role; Step 3: Drying: Drying the mixed powder obtained by wet ball milling to remove moisture; Step 4: Adding coating agent: Adding coating agent to the dried mixed powder. The coating agent improves the fluidity and stability of the powder and also helps in the subsequent coating process. Step 5: Coating: Place the mixed powder after adding the coating agent into the coating machine for coating, and evenly cover the coating agent on the powder surface by spraying; Step 6: Drying and sintering: The coated powder is dried again to remove the solvent in the coating agent, and then the powder is sintered to combine the particles to form solid tungsten carbide; Step 7, powder processing: the sintered tungsten carbide block objects need to be crushed, screened and classified to obtain tungsten carbide powder that meets the requirements; In step 4, the coating agent is graphite, which is a natural substance in the form of carbon. It reacts with tungsten powder at high temperature to form a surface coating layer of tungsten carbide particles.

2. The fully coated tungsten carbide production process according to claim 1, characterized in that: In the step 1, the mixing ratio of tungsten powder and carbon powder as raw materials is 1:

1.

3. The fully coated tungsten carbide production process according to claim 1, characterized in that: In step 2, the ball milling medium is steel balls made of carbon steel or alloy steel.

4. The fully coated tungsten carbide production process according to claim 1, characterized in that: In step 6, the coated powder is sintered at a temperature between 2500° C. and 2800° C. for 3 hours.

5. The fully coated tungsten carbide production process according to claim 1, characterized in that: The powder processing specifically comprises the following steps: Step 7-1, Powder cooling: After sintering, the powder will be in a high temperature state. Place the high temperature powder in a freezer to accelerate cooling and reduce cooling time; Step 7-2, powder crushing: The sintered powder will form blocks or agglomerates, which are crushed using a grinder to restore them to granular form; Step 7-3, particle size classification: Use a screening machine to classify the powder according to product requirements; Step 7-4, surface treatment: pickling the powder again to improve the surface properties of the powder and adapt to the requirements of subsequent processes; Step 7-5, product preparation: According to specific needs, the treated powder is heat-treated and dried to finally obtain the desired tungsten carbide product.

6. A screw, characterized in that: Its surface is coated with fully coated tungsten carbide obtained by the production process according to any one of claims 1 to 5, and comprises a rod body (4), wherein the front and rear ends of the rod body (4) are fixedly connected to connecting parts (5).

7. A barrel, characterized in that: A screw as claimed in claim 6 is installed inside the screw, comprising a barrel (1), a mounting groove (2) is provided in the middle of the barrel (1), two rod bodies (4) are rotatably connected inside the mounting groove (2), and a mounting plate (3) is fixedly connected to the bottom end of the barrel (1).

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