Method for manufacturing die head of ultra-high precision screw extrusion equipment

Abstract

The present invention provides a kind of preparation method of ultra-high precision screw extrusion equipment die head, belong to die head preparation technology field, comprise the following steps: titanium alloy material is processed out preliminary gap height to obtain initial die head, preliminary gap height is greater than required gap height, initial die head is successively immersed in organic solvent and alkaline solution, clean up;The gap of the initial die head after cleaning up is coated with lubricant, steel sheet is inserted into the gap of initial die head, the thickness of steel sheet is identical with the gap height required for the final die head of screw extruder;Pressure is applied to initial die head, the gap in initial die head is closely fitted with steel sheet, put into aqua regia and wait for steel sheet partial corrosion, take out remaining steel sheet;The initial die head after taking out steel sheet is cleaned, dried, smear chemical polishing liquid, detect gap height, obtain the final die head of screw extruder.The present invention realizes that the extrusion die head produced under low cost meets the gap height of 2~10 microns, and technique is simple and is applicable to batch production.

Description

Technical Field

[0001] The invention relates to the technical field of die head preparation, and in particular to a method for manufacturing a die head of ultra-high precision screw extrusion equipment. Background Art

[0002] With the development of new energy materials and precision electronic components, thin film materials are widely used in cutting-edge scientific and technological fields such as flexible thin film batteries, conductive films, transparent electrodes, and functional coatings. These applications place extremely high demands on the quality, thickness uniformity, and surface flatness of thin film materials, and extrusion die technology has a significant impact on these properties. However, traditional extrusion dies currently have difficulty meeting the high-precision gap requirements of 5 microns and below. Ultra-precision machining or laser micromachining can be used in existing technologies to improve the accuracy of the gap, but the above-mentioned technical means have problems such as high cost, long cycle time, high difficulty, and bottlenecks in mass production. Therefore, it is necessary to provide an economical, controllable, and industrially friendly high-precision extrusion equipment die production process. Summary of the Invention

[0003] In view of this, the present invention provides a method for manufacturing an ultra-high precision screw extrusion equipment die head, which can achieve low-cost production of an extrusion die head meeting a gap height of 2 to 10 microns, has a simple process, and is suitable for mass production.

[0004] To achieve the above object, the present invention provides a method for manufacturing a die head of an ultra-high precision screw extruder, comprising the following steps:

[0005] S1. Selecting titanium alloy as the main material of the die, processing the titanium alloy material to obtain an initial gap height, wherein the initial gap height is greater than the desired gap height, and immersing the initial die in an organic solvent and an alkaline solution, and cleaning it;

[0006] S2, the gap of the cleaned initial die is coated with lubricant, and a steel sheet is inserted into the gap of the initial die. The thickness of the steel sheet is the same as the gap height required by the final die of the screw extruder;

[0007] S3, applying pressure to the initial die head so that the gap in the initial die head fits tightly with the steel sheet, adding aqua regia to wait for the steel sheet to be partially corroded, and removing the remaining steel sheet;

[0008] S4. Clean and dry the initial die head after taking out the steel sheet, apply chemical polishing liquid, detect the gap height, and obtain the final die head of the screw extruder.

[0009] Optionally, the organic solvent is acetone; and the alkaline solution is sodium bicarbonate solution.

[0010] The acetone and sodium bicarbonate used in the present invention can remove impurities and acidic substances on the surface of the initial die head.

[0011] Optionally, the lubricant is fluorine-containing oil.

[0012] Optionally, the fluorine-containing oil is of the type Superlube fluorine-containing oil.

[0013] The fluorine-containing oil used in the present invention does not react with highly corrosive chemical media such as aqua regia below 100° C., contains polytetrafluoroethylene particles, can form a smooth solid lubricating film, reduce the friction coefficient, and has anti-wear, anti-friction, rust and corrosion resistance. It is non-toxic and odorless, has a wide operating temperature range and is environmentally friendly, which facilitates the subsequent removal of steel sheets.

[0014] Optionally, the aqua regia is a mixture of nitric acid and hydrochloric acid, and the volume ratio of the nitric acid to the hydrochloric acid is 1:3.

[0015] The present invention uses aqua regia to corrode the steel sheet, but aqua regia cannot corrode titanium alloy. Therefore, after a part of the steel sheet is corroded, the steel sheet can be easily removed. After the steel sheet is removed, its thickness is the height of the gap, and a simple process can achieve the preparation of high-precision gaps.

[0016] Optionally, the time for waiting for the steel sheet to be partially corroded by adding aqua regia is 10 to 30 minutes.

[0017] Optionally, the initial gap height is 0.2-0.5 mm, and the thickness of the steel sheet is 2-10 μm.

[0018] Optionally, the chemical polishing liquid is a phosphoric acid-sulfuric acid polishing liquid.

[0019] Optionally, the phosphoric acid-sulfuric acid polishing liquid includes chromic anhydride and glycerol.

[0020] The mixed acid of phosphoric acid and sulfuric acid used in the present invention can corrode the oxide film and metallic titanium on the titanium surface, chromic anhydride can play a passivation role to prevent excessive corrosion, and glycerol can increase the viscosity of the polishing liquid, making the polishing process more stable and helping to improve the surface quality.

[0021] Optionally, the cleaning is to rinse the initial die head with clean water and then perform ultrasonic cleaning.

[0022] The above technical solution of the present invention includes at least the following beneficial effects:

[0023] The preparation method provided by the present invention achieves ultra-high precision of 2 to 10 microns at a low cost, making it suitable for the production of extrusion dies for thin-film battery materials. This method reduces the complexity and cost of high-precision machining of traditional extrusion dies, simplifies the process, and facilitates mass production. The cleaning and lubricating steps improve the quality and performance of the extrusion die, facilitate steel sheet removal, extend the die's service life, and make the extrusion die more stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a process flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0026] Example 1

[0027] High-precision extrusion equipment die head for preparing 5 micron gap

[0028] Initial die processing and cleaning: Select titanium alloy as the main material of the die, process the titanium alloy into an initial die with a gap of 0.5 mm, soak the initial die in acetone, then wipe it lightly with a clean cloth or brush and rinse with water; then wipe it with an alcohol cotton ball; then soak it in sodium bicarbonate solution to remove acidic substances, and then rinse with water.

[0029] Apply lubricant and insert steel sheet: Apply Superlube fluorinated oil lubricant to the cleaned die gap and insert a 5-micron thick steel sheet into the die gap.

[0030] Compacting treatment and steel sheet corrosion: Apply vertical pressure through a hydraulic press to make the die head gap fit tightly with the steel sheet, immerse the die head in aqua regia and wait for the steel sheet to corrode. Aqua regia is a mixture of nitric acid and hydrochloric acid, and the volume ratio of the nitric acid to the hydrochloric acid is 1:3. After waiting for 10 minutes, the steel sheet is partially corroded and easy to remove. After the steel sheet is removed, the thickness of the steel sheet is the height of the die head gap.

[0031] Cleaning and testing: First rinse the die head with plenty of clean water to remove residual aqua regia and impurities; then perform ultrasonic cleaning; polish with a phosphoric acid-sulfuric acid polishing solution containing a small amount of chromic anhydride and glycerol, and then use a microscope to detect that the gap height is 5 microns.

[0032] Example 2

[0033] High-precision extrusion equipment die head for preparing 2 micron gap

[0034] Initial die processing and cleaning: Select titanium alloy as the main material of the die, process the titanium alloy into an initial die with a gap of 0.2 mm, soak the initial die in acetone, then wipe it lightly with a clean cloth or brush and rinse with water; then wipe it with an alcohol cotton ball; then soak it in sodium bicarbonate solution to remove acidic substances, and then rinse with water.

[0035] Apply lubricant and embed steel sheet: Apply fluorine-containing oil lubricant to the cleaned die gap and insert a 2-micron thick steel sheet into the die gap.

[0036] Compacting treatment and steel sheet corrosion: Apply vertical pressure through a hydraulic press to make the die head gap fit tightly with the steel sheet, immerse the die head in aqua regia and wait for the steel sheet to corrode. Aqua regia is a mixture of nitric acid and hydrochloric acid, and the volume ratio of the nitric acid to the hydrochloric acid is 1:3. After waiting for 30 minutes, the steel sheet is partially corroded and easy to remove. After the steel sheet is removed, the thickness of the steel sheet is the height of the die head gap.

[0037] Cleaning and testing: First rinse the die head with plenty of clean water to remove residual aqua regia and impurities; then perform ultrasonic cleaning; polish with phosphoric acid-sulfuric acid polishing liquid, and then use a microscope to detect that the gap height is 2 microns.

[0038] Example 3

[0039] High-precision extrusion equipment die head for preparing 10 micron gap

[0040] Initial die processing and cleaning: Select titanium alloy as the main material of the die, process the titanium alloy into an initial die with a gap of 0.4 mm, soak the initial die in acetone, then wipe it lightly with a clean cloth or brush and rinse with water; then wipe it with an alcohol cotton ball; then soak it in sodium bicarbonate solution to remove acidic substances, and then rinse with water.

[0041] Apply lubricant and embed steel sheet: Apply fluorine-containing oil lubricant to the cleaned die gap and insert a 10-micron-thick steel sheet into the die gap.

[0042] Compacting treatment and steel sheet corrosion: Apply vertical pressure through a hydraulic press to make the die head gap fit tightly with the steel sheet, immerse the die head in aqua regia and wait for the steel sheet to corrode. Aqua regia is a mixture of nitric acid and hydrochloric acid, and the volume ratio of the nitric acid to the hydrochloric acid is 1:3. After waiting for 20 minutes, the steel sheet is partially corroded and easy to remove. After the steel sheet is removed, the thickness of the steel sheet is the height of the die head gap.

[0043] Cleaning and testing: First rinse the die head with plenty of clean water to remove residual aqua regia and impurities; then perform ultrasonic cleaning; polish with phosphoric acid-sulfuric acid polishing liquid, and then use a microscope to detect that the gap height is 10 microns.

[0044] Example 4

[0045] Extrusion test using a high-precision die with a 10-micron gap height

[0046] The die head with a 10-micron gap prepared in Example 3 was installed on a screw extruder (conventional screw extrusion equipment on the market). According to the operating process of the screw extruder, polyethylene powder (30 mesh) was added, the front-stage heating temperature was set to 180°C, the rear-end heating temperature was set to 200°C, the screw rotation speed was set to 20 rpm, and a screw extrusion test was performed. A polyethylene film was obtained at the die head outlet, and the thickness of the polyethylene film was 10 microns when detected by microscopy.

[0047] In the present invention, unless otherwise clearly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified and limited, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0048] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for manufacturing a die head of an ultra-high precision screw extrusion equipment, characterized in that: The following steps are involved: S1. Selecting titanium alloy as the main material of the die, processing the titanium alloy material to obtain an initial gap height, wherein the initial gap height is greater than the desired gap height, and immersing the initial die in an organic solvent and an alkaline solution, and cleaning it; S2, the gap of the cleaned initial die is coated with lubricant, and a steel sheet is inserted into the gap of the initial die. The thickness of the steel sheet is the same as the gap height required by the final die of the screw extruder; S3, applying pressure to the initial die head so that the gap in the initial die head fits tightly with the steel sheet, adding aqua regia to wait for the steel sheet to be partially corroded, and removing the remaining steel sheet; S4. Clean and dry the initial die head after taking out the steel sheet, apply chemical polishing liquid, and detect the gap height to obtain the final die head product of the screw extruder.

2. The method for manufacturing a die head of an ultra-high precision screw extruder according to claim 1, wherein: The organic solvent is acetone; and the alkaline solution is sodium bicarbonate solution.

3. The method for manufacturing a die head of an ultra-high precision screw extruder according to claim 1, wherein: The lubricant is fluorine-containing oil.

4. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 3, wherein: The model of the fluorinated oil is Superlube fluorinated oil.

5. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 1, characterized in that: The aqua regia is a mixture of nitric acid and hydrochloric acid, and the volume ratio of the nitric acid to the hydrochloric acid is 1:

3.

6. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 1, characterized in that: The time for waiting for the steel sheet to be partially corroded after adding aqua regia is 10 to 30 minutes.

7. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 1, characterized in that: The height of the preliminary gap is 0.2-0.5 mm, and the thickness of the steel sheet is 2-10 μm.

8. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 1, characterized in that: The chemical polishing liquid is a phosphoric acid-sulfuric acid polishing liquid.

9. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 8, characterized in that: The phosphoric acid-sulfuric acid polishing liquid includes chromic anhydride and glycerol.

10. The method for manufacturing a die head for ultra-high precision screw extrusion equipment according to claim 1, characterized in that: The cleaning comprises rinsing the initial die head with clean water and then performing ultrasonic cleaning.

Images