A wax pattern cleaning process

Abstract

The present invention discloses a wax mold cleaning process, belonging to the technical field of wax mold cleaning, which comprises the following steps: adding a cleaning agent and water into the cleaning tank of an ultrasonic cleaning machine, controlling the temperature at 20-25 °C, stirring for 3-5 minutes to obtain a cleaning solution, putting the wax mold into the cleaning solution, and performing ultrasonic cleaning under the irradiation of a fluorescent lamp at a frequency of 20-50 kHz. After the ultrasonic cleaning is completed, take it out, wipe the surface of the wax mold, especially the inner cavity of the wax mold, with a soft material, rinse it with water after wiping, and then hang it dry or blow it dry with an air gun. The present invention provides a wax mold cleaning process, which adopts an ultrasonic + chemical composite cleaning process. Under the action of ultrasonic waves, the cleaning solution is fully contacted with the wax mold, especially in the dead corners of oil stains on the wax mold, so that the cleaning agent can fully play the roles of adsorption, dissolution, decomposition, etc. The obtained wax film has a high surface cleanliness, and thus the product quality of the automotive parts cast by the wax mold is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of wax mold cleaning, and particularly relates to a wax mold cleaning process. Background Art

[0002] Investment casting, also known as precision casting or lost wax casting, uses fusible materials and plastics to make fusible models. Several layers of refractory coatings are applied to the models, and after drying and hardening, they form an integral shell. Then, the shell is heated to melt away the models, and after high-temperature roasting, it becomes a refractory shell. Liquid metal is poured into the refractory shell, and after cooling, it becomes a casting. Compared with other casting methods, the main advantages of investment casting are as follows: 1) High dimensional accuracy and low surface roughness of the castings, and complex-shaped castings can be cast. Generally, the accuracy can reach grades 5 - 7, and the roughness reaches Ra25 - 6.3μm; 2) Thin-walled castings and very small-weight castings can be cast. The minimum wall thickness of investment castings can reach 0.5mm, and the weight can be as small as a few grams. Castings with fine patterns, characters, and castings with fine grooves and curved fine holes can be cast; 3) The external and internal cavity shapes of investment castings are almost not restricted. Complex-shaped structures that are difficult to manufacture by sand casting, forging, machining, etc. can be manufactured. Moreover, some assemblies and weldings can be directly cast into integral parts after slight structural improvement, thereby reducing the weight of the parts and the production cost; 4) There is almost no restriction on the types of casting alloys, and it is often used to cast alloy steel parts, carbon steel parts, and heat-resistant alloy castings; 5) There is no restriction on the production batch, and it can be produced from single-piece to large-batch production. Based on the above advantages, investment casting is widely used in the preparation of existing automotive parts.

[0003] However, during the production of automotive parts by investment casting, it is required that the surface of the wax mold has no oil stains, impurities, and release agent residues. Otherwise, it will seriously affect the quality of the finished automotive parts. However, the existing wax mold cleaning generally uses simple wax mold cleaning agents for immersion cleaning, and the cleaning effect is not good. First, it cannot deeply clean the dead corners such as the internal pits of the wax mold, and second, it cannot effectively remove oil stains. Therefore, it is necessary to provide a wax mold cleaning process. Summary of the Invention

[0004] The purpose of the present invention is to provide a wax mold cleaning process to solve the problems in the background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A wax mold cleaning process includes the following steps:

[0007] Add cleaning agent and water to the cleaning tank of the ultrasonic cleaner, control the temperature at 20 - 25 °C, stir for 3 - 5 min to obtain the cleaning solution. Put the wax mold into the cleaning solution, and under the irradiation of a fluorescent lamp, perform ultrasonic cleaning at a frequency of 20 - 50 kHz. After the ultrasonic cleaning is completed, take it out, wipe the surface of the wax mold with a soft material, especially the inner cavity of the wax mold. After wiping, rinse it with water, and then hang it dry or blow it dry with an air gun.

[0008] As a further solution of the present invention, the cleaning agent is prepared through the following steps:

[0009] Prepare the following raw materials by weight: 10 - 30 parts of nonylphenol polyoxyethylene ether, 10 - 30 parts of alkylbenzene sulfonic acid, 10 - 20 parts of triethanolamine, 10 parts of fatty alcohol polyoxyethylene ether, 5 - 10 parts of shell-based purifying agent, 60 - 100 parts of propylene glycol methyl ether, 60 - 100 parts of methyl ethyl ketone, and 400 - 700 parts of water; Mix nonylphenol polyoxyethylene ether, alkylbenzene sulfonic acid, fatty alcohol polyoxyethylene ether and 1 / 3 of the mass of water evenly, add triethanolamine, shell-based purifying agent and the remaining water under stirring, stir for 5 - 10 min, then add the remaining raw materials, and continue to stir and emulsify for 1 - 2 h.

[0010] As a further solution of the present invention, the mass ratio of the cleaning agent to water is 1:1 - 2, and the ultrasonic cleaning time is 30 - 60 min.

[0011] As a further solution of the present invention, the shell-based purifying agent is prepared through the following steps:

[0012] Step S1: Immerse the mussel shell in a 1 wt% hydrochloric acid solution for 24 h, wash it with distilled water until the washing liquid is neutral, dry it, crush it through a 120-mesh sieve, transfer it to a crucible, then put it into the quartz tube of a vacuum tube furnace, control the nitrogen flow rate at 100 mL / min, heat up to 900 - 1000 °C, calcine for 2 - 2.5 h, cool down to 300 °C, turn off the nitrogen and the tube furnace, cool to room temperature, and grind it through a 100-mesh sieve to obtain calcined shell powder;

[0013] Step S2: Ultrasonically mix the calcined shell powder and isopropyl alcohol for 10 - 15 min, dropwise add tetrabutyl titanate under stirring, stir for 20 min to obtain solution a. Mix isopropyl alcohol, deionized water, cerium nitrate hexahydrate and urea, and adjust the pH to 3 - 4 with nitric acid solution to obtain solution b. Slowly drop solution b into solution a. After the dropping is completed, stir magnetically for 2 h to form a sol. Let it stand at room temperature for 12 h, then remove the upper clear liquid, dry it in a blast drying oven at 65 °C, and grind it to obtain the hybrid powder;

[0014] Step S3: Mix the hybrid powder, rhamnolipid, and deionized water, stir for 10 - 20 min, then transfer to a high-pressure reactor, keep the temperature at 120 °C for 24 h. After the reaction, cool down to room temperature, perform suction filtration, and dry the filter cake to obtain the shell-based purifying agent.

[0015] In the present invention, the shell powder is first calcined. Since the main component of the shell is calcium carbonate, and it also contains organic substances in addition, these substances will gradually decompose as the temperature rises, generating gases and energy that have a certain impact on the shell structure, forming a relatively uniform void structure on the shell surface to obtain the calcined shell powder. Then, using the calcined shell powder as a porous carrier, Ce, N-doped modified nano-titanium dioxide particles are loaded to obtain the hybrid powder. Compared with loading titanium dioxide without doping Ce and N elements, the incorporation of Ce and N inhibits the transformation of titanium dioxide from the anatase phase to the rutile phase and the growth of particles, broadens its absorption range in the visible light region, reduces the recombination probability of photo-generated electrons and holes, and improves its photocatalytic degradation performance. Finally, a natural surfactant (rhamnolipid) is introduced on the surface of the hybrid powder by the hydrothermal method to obtain the shell-based purifying agent with high adsorption, good water solubility, and photocatalytic degradation performance.

[0016] As a further aspect of the present invention, the dosage ratio of mussel shell to 1 wt% hydrochloric acid solution is 1 g: 8 - 10 mL.

[0017] As a further aspect of the present invention, in solution b, the dosage ratio of isopropanol, deionized water, cerium nitrate hexahydrate, and urea is 20 mL: 2.4 mL: 2.1 - 2.4 g: 0.8 - 1.3 g, and the dosage ratio of calcined shell powder, isopropanol, tetrabutyl titanate, cerium nitrate hexahydrate, and urea is 1 - 3 g: 50 - 60 mL: 12 - 15 mL: 2.1 - 2.4 g: 0.8 - 1.3 g.

[0018] As a further aspect of the present invention, the dosage ratio of the hybrid powder, rhamnolipid, and deionized water is 3 - 5 g: 1 - 2 g: 30 - 50 mL.

[0019] The beneficial effects of the present invention:

[0020] The present invention provides a wax mold cleaning process, which adopts an ultrasonic + chemical composite cleaning process. Under the action of ultrasonic waves, the cleaning liquid is fully contacted with the wax mold, especially at the dead corners of the oil stains dispersed in the wax mold, so that the cleaning agent can fully play the roles of adsorption, dissolution, decomposition, etc. Compared with the corresponding cleaning agent, the cleaning agent prepared by the present invention not only has good emulsifying performance and high stability, belongs to a water-based product, is environmentally friendly, odorless, non-toxic and non-corrosive, but also contains a shell-based purifying agent, which combines the dual advantages of a natural surfactant (rhamnolipid) and a porous material. The natural surfactant reduces the surface tension of the oil stain, and the cavities on the material surface are used to wash the oil. At the same time, the vibration of ultrasonic waves is beneficial to the adsorption and removal of the oil stain, and titanium dioxide of Ce and N has catalytic degradation performance under a fluorescent lamp. Therefore, the introduction of the shell-based purifying agent can play multiple functions of dissolving, adsorbing and degrading the oil stain, and can greatly improve the cleaning effect of the cleaning agent on the wax mold. In summary, through the wax mold cleaning process provided by the present invention, the surface of the wax film obtained is highly clean, and thus the product quality of the automotive parts cast by the wax mold is guaranteed. Detailed implementation mode

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1

[0023] A shell-based purifying agent is prepared through the following steps:

[0024] Step S1: Immerse 10 g of mussel shells in 80 mL of 1 wt% hydrochloric acid solution for 24 h, wash with distilled water until the washing liquid is neutral, dry, crush and pass through a 120-mesh sieve, transfer to a crucible, then place it in the quartz tube of a vacuum tube furnace, control the nitrogen flow rate at 100 mL / min, heat up to 900 °C, calcine for 2 h, cool down to 300 °C, close the nitrogen and the tube furnace, cool to room temperature, grind and pass through a 100-mesh sieve to obtain calcined shell powder;

[0025] Step S2: Ultrasonically mix 1 g of calcined shell powder and 50 mL of isopropanol for 10 min. While stirring, slowly add 12 mL of tetrabutyl titanate dropwise. After stirring for 20 min, solution a is obtained. Mix isopropanol, deionized water, cerium nitrate hexahydrate, and urea, and adjust the pH to 3 with nitric acid solution to obtain solution b. Slowly add solution b to solution a. After the addition is complete, stir magnetically for 2 h to form a sol. Let it stand at room temperature for 12 h, then remove the supernatant and dry it in a blast drying oven at 65 °C, and grind it to obtain a hybrid powder. In solution b, the dosage ratio of isopropanol, deionized water, cerium nitrate hexahydrate, and urea is 20 mL: 2.4 mL: 2.1 g: 0.8 g;

[0026] Step S3: Mix 3 g of the hybrid powder, 1 g of rhamnolipid, and 30 mL of deionized water, stir for 10 min, then transfer to a high-pressure reactor, keep the temperature at 120 °C for 24 h for the reaction. After the reaction is completed, cool down to room temperature, filter by suction, and dry the filter cake to obtain a shell-based purifying agent.

[0027] Example 2

[0028] A shell-based purifying agent is prepared by the following steps:

[0029] Step S1: Immerse 10 g of mussel shells in 90 mL of 1 wt% hydrochloric acid solution for 24 h, wash with distilled water until the washing liquid is neutral, dry, crush and sieve through a 120-mesh sieve, transfer to a crucible, and then place it in the quartz tube of a vacuum tube furnace. Control the nitrogen flow rate at 100 mL / min, heat up to 950 °C, calcine for 2.2 h, cool down to 300 °C, turn off the nitrogen and the tube furnace, cool to room temperature, and grind through a 100-mesh sieve to obtain calcined shell powder;

[0030] Step S2: Ultrasonically mix 2 g of calcined shell powder and 55 mL of isopropanol for 12 min. While stirring, slowly add 14 mL of tetrabutyl titanate dropwise. After stirring for 20 min, solution a is obtained. Mix isopropanol, deionized water, cerium nitrate hexahydrate, and urea, and adjust the pH to 4 with nitric acid solution to obtain solution b. Slowly add solution b to solution a. After the addition is complete, stir magnetically for 2 h to form a sol. Let it stand at room temperature for 12 h, then remove the supernatant and dry it in a blast drying oven at 65 °C, and grind it to obtain a hybrid powder. In solution b, the dosage ratio of isopropanol, deionized water, cerium nitrate hexahydrate, and urea is 20 mL: 2.4 mL: 2.2 g: 1.0 g;

[0031] Step S3: Mix 4 g of the hybrid powder, 1.5 g of rhamnolipid, and 40 mL of deionized water, stir for 15 min, then transfer to a high-pressure reactor, keep the temperature at 120 °C for 24 h for the reaction. After the reaction is completed, cool down to room temperature, filter by suction, and dry the filter cake to obtain a shell-based purifying agent.

[0032] Example 3

[0033] A shell-based purifying agent is prepared through the following steps:

[0034] Step S1: Place 10 g of mussel shells in 100 mL of 1 wt% hydrochloric acid solution and soak for 24 h. Wash with distilled water until the washing liquid is neutral, dry, crush through a 120-mesh sieve, transfer to a crucible, then place it in the quartz tube of a vacuum tube furnace. Control the nitrogen flow rate at 100 mL / min, heat up to 1000 °C, calcine for 2.5 h, cool down to 300 °C, close the nitrogen and the tube furnace, cool to room temperature, grind through a 100-mesh sieve to obtain calcined shell powder;

[0035] Step S2: Ultrasonically mix 3 g of calcined shell powder and 60 mL of isopropanol for 15 min. Dropwise add 15 mL of tetrabutyl titanate under stirring, and stir for 20 min to obtain solution a. Mix isopropanol, deionized water, cerium nitrate hexahydrate and urea, and adjust the pH to 4 with nitric acid solution to obtain solution b. Slowly drop solution b into solution a. After the dropping is completed, magnetically stir for 2 h to form a sol. Let it stand at room temperature for 12 h, then remove the upper clear liquid, dry in a blast drying oven at 65 °C, grind to obtain a hybrid powder. The dosage ratio of isopropanol, deionized water, cerium nitrate hexahydrate and urea in solution b is 20 mL: 2.4 mL: 2.4 g: 1.3 g;

[0036] Step S3: Mix 5 g of the hybrid powder, 2 g of rhamnolipid and 50 mL of deionized water, stir for 20 min, then transfer to a high-pressure reactor, keep the temperature at 120 °C and react for 24 h. After the reaction is completed, cool down to room temperature, filter by suction, dry the filter cake to obtain the shell-based purifying agent.

[0037] Example 4

[0038] A wax mold cleaning process includes the following steps:

[0039] Add a cleaning agent and water with a mass ratio of 1:1 to the cleaning tank of an ultrasonic cleaner, control the temperature at 20 °C, stir for 3 min to obtain a cleaning liquid. Put the wax mold into the cleaning liquid, and under the irradiation of a fluorescent lamp, ultrasonically clean at a frequency of 20 kHz for 60 min. After the ultrasonic cleaning is completed, take it out, wipe the surface of the wax mold, especially the inner cavity of the wax mold, with a soft material. After wiping, rinse with water and hang dry or blow dry with an air gun.

[0040] The cleaning agent is prepared through the following steps:

[0041] Prepare the following raw materials in parts by weight: 10 parts of nonylphenol polyoxyethylene ether, 30 parts of alkylbenzene sulfonic acid, 10 parts of triethanolamine, 10 parts of fatty alcohol polyoxyethylene ether, 5 parts of the shell-based purifying agent of Example 1, 60 parts of propylene glycol monomethyl ether, 100 parts of methyl ethyl ketone, and 400 parts of water; mix nonylphenol polyoxyethylene ether, alkylbenzene sulfonic acid, fatty alcohol polyoxyethylene ether and 1 / 3 of the mass of water evenly, add triethanolamine, shell-based purifying agent and the remaining water under stirring, add the remaining raw materials after stirring for 5 min, and stir and emulsify for 1 h.

[0042] Example 5

[0043] A wax mold cleaning process includes the following steps:

[0044] Add a cleaning agent and water with a mass ratio of 1:2 to the cleaning tank of an ultrasonic cleaner, control the temperature at 25°C, stir for 4 min to obtain a cleaning solution, put the wax mold into the cleaning solution, and perform ultrasonic cleaning at a frequency of 40 kHz for 40 min under the illumination of a fluorescent lamp. After the ultrasonic cleaning is completed, take it out, wipe the surface of the wax mold, especially the inner cavity of the wax mold, with a soft material, rinse it with water after wiping, and hang it dry or blow it dry with an air gun.

[0045] The cleaning agent is prepared through the following steps:

[0046] Prepare the following raw materials in parts by weight: 20 parts of nonylphenol polyoxyethylene ether, 20 parts of alkylbenzene sulfonic acid, 15 parts of triethanolamine, 10 parts of fatty alcohol polyoxyethylene ether, 8 parts of the shell-based purifying agent of Example 2, 70 parts of propylene glycol monomethyl ether, 80 parts of methyl ethyl ketone, and 500 parts of water; mix nonylphenol polyoxyethylene ether, alkylbenzene sulfonic acid, fatty alcohol polyoxyethylene ether and 1 / 3 of the mass of water evenly, add triethanolamine, shell-based purifying agent and the remaining water under stirring, add the remaining raw materials after stirring for 8 min, and stir and emulsify for 1.5 h.

[0047] Example 6

[0048] A wax mold cleaning process includes the following steps:

[0049] Add a cleaning agent and water with a mass ratio of 1:2 to the cleaning tank of an ultrasonic cleaner, control the temperature at 25°C, stir for 5 min to obtain a cleaning solution, put the wax mold into the cleaning solution, and perform ultrasonic cleaning at a frequency of 50 kHz for 60 min under the illumination of a fluorescent lamp. After the ultrasonic cleaning is completed, take it out, wipe the surface of the wax mold, especially the inner cavity of the wax mold, with a soft material, rinse it with water after wiping, and hang it dry or blow it dry with an air gun.

[0050] The cleaning agent is prepared through the following steps:

[0051] Prepare the following raw materials in parts by weight: 30 parts of nonylphenol polyoxyethylene ether, 10 parts of alkylbenzene sulfonic acid, 20 parts of triethanolamine, 10 parts of fatty alcohol polyoxyethylene ether, 10 parts of the shell-based purifying agent of Example 2, 100 parts of propylene glycol methyl ether, 100 parts of methyl ethyl ketone, and 700 parts of water; mix nonylphenol polyoxyethylene ether, alkylbenzene sulfonic acid, fatty alcohol polyoxyethylene ether and 1 / 3 mass of water evenly, add triethanolamine, shell-based purifying agent and the remaining water under stirring, add the remaining raw materials after stirring for 10 min, and continue stirring and emulsifying for 2 h.

[0052] Comparative Example 1

[0053] This comparative example provides a wax mold cleaning process. Compared with Example 4, the shell-based purifying agent in the cleaning agent in Example 4 is removed, and the remaining raw materials and steps are the same as those in Example 4.

[0054] For the wax molds treated by the wax mold cleaning processes described in Example 4, Example 5, Example 6 and Comparative Example 1, appearance tests were carried out, and the results are shown in Table 1:

[0055] Table 1

[0056]

[0057] As can be seen from Table 1, compared with Comparative Example 1, the surfaces of the wax molds obtained by the wax mold cleaning processes of Example 4, Example 5 and Example 6 are cleaner.

[0058] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0059] 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, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wax pattern cleaning process, characterized in that, It includes the following steps: First step: Mix nonylphenol polyoxyethylene ether, alkylbenzene sulfonic acid, fatty alcohol polyoxyethylene ether and 1 / 3 mass of water evenly, add triethanolamine, shell-based purifying agent and the remaining water under stirring, stir for 5 - 10 min, then add propylene glycol methyl ether and butanone, and continue to stir and emulsify for 1 - 2 h to obtain a cleaning agent; Second step: Add the cleaning agent and water into the cleaning tank of an ultrasonic cleaning machine, control the temperature at 20 - 25 °C, stir for 3 - 5 min to obtain a cleaning solution, put a wax mold into the cleaning solution, under the irradiation of a fluorescent lamp, perform ultrasonic cleaning at a frequency of 20 - 50 kHz, take it out after the ultrasonic cleaning is finished, wipe the surface of the wax mold with a soft material, rinse it with water after wiping, and hang it dry or blow it dry with an air gun; The raw materials in the cleaning agent are in the following weight parts: 10 - 30 parts of nonylphenol polyoxyethylene ether, 10 - 30 parts of alkylbenzene sulfonic acid, 10 - 20 parts of triethanolamine, 10 parts of fatty alcohol polyoxyethylene ether, 5 - 10 parts of shell-based purifying agent, 60 - 100 parts of propylene glycol methyl ether, 60 - 100 parts of butanone, and 400 - 700 parts of water; The shell-based purifying agent is prepared through the following steps: Step S1: Immerse mussel shells in a 1 wt% hydrochloric acid solution for 24 h, wash, dry, crush them through a 120-mesh sieve, transfer them to a crucible, place them in the quartz tube of a vacuum tube furnace, control the nitrogen flow rate at 100 mL / min, heat up to 900 - 1000 °C, calcine for 2 - 2.5 h, cool down to 300 °C, close the nitrogen and the tube furnace, cool to room temperature, grind through a 100-mesh sieve to obtain calcined shell powder; Step S2: Ultrasonically mix the calcined shell powder and isopropanol for 10 - 15 min, dropwise add tetrabutyl titanate under stirring, stir for 20 min to obtain solution a, mix isopropanol, deionized water, cerium nitrate hexahydrate and urea and adjust the pH to 3 - 4 with a nitric acid solution to obtain solution b, slowly drop solution b into solution a, after the dropping is finished, stir magnetically for 2 h to form a sol, let it stand at room temperature for 12 h, then remove the upper clear liquid, dry it in a blast drying oven at 65 °C, grind it to obtain a hybrid powder; Step S3: Mix the hybrid powder, rhamnolipid and deionized water, stir and transfer them to a high-pressure reactor, keep the temperature at 120 °C and react for 24 h, after the reaction is finished, cool down to room temperature, filter by suction, dry the filter cake to obtain the shell-based purifying agent.

2. The wax mold cleaning process according to claim 1, characterized in that, In the second step, the mass ratio of the cleaning agent to water is 1:1 - 2, and the ultrasonic cleaning time is 30 - 60 min.

3. A wax pattern cleaning process according to claim 1, characterized in that, The dosage ratio of mussel shells to the 1 wt% hydrochloric acid solution is 1 g:8 - 10 mL.

4. A wax mold cleaning process according to claim 1, characterized in that, In solution b, the dosage ratio of isopropanol, deionized water, cerium nitrate hexahydrate and urea is 20 mL:2.4 mL:2.1 - 2.4 g:0.8 - 1.3 g, and the dosage ratio of calcined shell powder, isopropanol, tetrabutyl titanate, cerium nitrate hexahydrate and urea is 1 - 3 g:50 - 60 mL:12 - 15 mL:2.1 - 2.4 g:0.8 - 1.3 g.

5. A wax mold cleaning process according to claim 1, characterized in that, The dosage ratio of the hybrid powder, rhamnolipid and deionized water is 3 - 5 g:1 - 2 g:30 - 50 mL.

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