A lost foam casting process for wear-resistant machine tool parts

Abstract

This invention discloses a lost foam casting process for machine tool wear-resistant parts, relating to the field of metal casting. The suspending agent prepared by this invention can prevent the precipitation of solid refractory materials in the coating. The intercalated polymer in the suspending agent increases in molecular weight after cross-linking. This high molecular weight polymer effectively expands the interlayer spacing of bentonite, transforming the surface of bentonite, which exists in a granular powder state, into an oleophilic and hydrophobic state after intercalation. This overcomes surface activity and prevents agglomeration, effectively preventing the precipitation of solid refractory materials from the coating. The lost foam casting process for machine tool wear-resistant parts of this invention produces castings with a hardness range between HB193 and 212, producing rolled iron filings, exhibiting good machinability, meeting design rigidity requirements, and achieving a consistent surface gloss and uniform density after finishing.

Description

Technical Field

[0001] This invention relates to the field of metal casting, specifically to a lost foam casting process for wear-resistant machine tool parts. Background Technology

[0002] Lost foam casting, also known in the industry as vaporization casting or solid casting, is a novel casting process. The basic principle involves bonding and assembling a paraffin or foam model similar in size and shape to the pre-formed casting into a model cluster. A refractory coating is then applied to the outer surface of the model cluster, and after heating and drying, it is embedded in dry silica sand and vibrated to form the desired shape. Under negative pressure, the casting is poured, causing the pre-formed model to rapidly vaporize. The high-temperature liquid metal occupies the pre-formed model's position, and after the liquid solidifies and cools, the casting is formed.

[0003] Lost foam casting is a new type of casting method with high forming rate, small machining allowance, and precise shaping of blanks. The advantages of this new casting method are that it does not require removing the pre-made sample mold from the mold cavity, and the parting line is not visible on the product appearance. There is also no need to use sand cores in the lost foam casting process, so there are no casting defects such as burrs, rough edges, and draft angles on the formed products. At the same time, it can reduce the dimensional deviations caused by the combination of cores, mold boxes, etc.

[0004] CN102371340A discloses a lost foam casting method for large castings. This method ensures the overall permeability of the mold by adjusting the composition of the lost foam coating and using clay sand molding. Simultaneously, it combines vacuum negative pressure pouring to rapidly expel and remove the vaporized foam from the casting process, thus achieving lost foam casting of large stainless steel or alloy cast iron castings. This method is less expensive than investment casting and produces castings with superior overall mechanical properties compared to ordinary gravity casting.

[0005] CN102974762A: A lost foam casting process, characterized by: selection of foam beads, model making, pre-foaming to expand the beads to a certain size; curing, foaming molding, model assembly into clusters, model coating, vibration molding, pouring replacement, cooling and cleaning; and finally, simple sand casting and removal of the sand. The casting can be lifted out of the sand box at an angle or directly from the sand box, and the casting naturally separates from the dry sand. The separated dry sand is then processed and reused. This process eliminates the need for mold removal, parting lines, and sand cores, resulting in castings without flash, burrs, or draft angles. It also reduces dimensional errors caused by core assembly and can reduce machining time by 40% to 50% compared to traditional sand casting methods.

[0006] CN104874734A: This invention relates to the field of casting technology, specifically to a lost foam casting method, comprising the following steps: Step 1: Fabricating a foam white mold, assembling a gating system, brushing or spraying a special high-temperature resistant coating on the surface of the vaporization mold, and drying; Step 2: Placing a layered sand box on a workbench, filling it with dry sand, vibrating and leveling it, placing the dried vaporization mold on the bottom sand, filling it with dry sand, micro-vibrating for an appropriate time, and leveling the box opening; Step 3: Covering with a plastic film, placing a pouring cup on top, connecting a vacuum system to draw a vacuum, and after the dry sand has solidified, pouring is performed, the white mold vaporizes and disappears, and the molten metal replaces it; Step 4: Releasing the vacuum, and after the casting has solidified, turning the box over and removing the casting from the loose dry sand. The lost foam casting method disclosed in this invention has a reasonable process route design, produces castings with high surface finish and dimensional accuracy, has a simple production process, high metal utilization rate, almost complete reuse of old sand, and reduced molding costs.

[0007] Currently, the wear-resistant components of machine tools have poor machinability and low rigidity. After finishing, the castings have porosity and carbon defects on the surface, resulting in inconsistent surface gloss. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a lost foam casting process for wear-resistant machine tool parts. The lost foam casting process for wear-resistant machine tool parts of this invention produces castings with a hardness range of HB193-212, produces rolled iron filings, exhibits good machinability, meets design requirements for rigidity, and results in a consistent surface gloss and uniform density after finishing.

[0009] The technical solution of this invention is as follows:

[0010] A lost foam casting process for wear-resistant machine tool parts includes the following steps: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining.

[0011] The coating thickness is 3-5mm, and it is applied in 3 coats. The coating is prepared by mixing 30-50 parts of alumina powder, 30-50 parts of talc powder, 1-5 parts of cryolite powder, 3-7 parts of suspending agent, 2-5 parts of silica sol, 1-4 parts of sodium lignosulfonate, 0.5-2 parts of attapulgite, 0.05-0.5 parts of n-butanol, and 60-80 parts of water.

[0012] The drying temperature is 40-55℃ to ensure that each coat of paint is dry.

[0013] During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

[0014] The casting temperature is 1450-1550℃, the casting pressure is controlled at -0.05~-0.07MPa, the molten iron level is controlled at 2 / 3~3 / 4 during the casting process, and the pressure is held for 10-20 minutes after casting is completed.

[0015] The molten iron is composed of 30-50 parts of 18# medium-manganese type I pig iron, 30-50 parts of A3 coiled steel, 5-15 parts of recycled material, and 0.1-0.5 parts of inoculant; the composition of the molten iron is C: 3.0-3.1%; Si: 1.6-1.8%; Mn: 0.9-1.1%; S: 0.06-0.08%; P: 0.03-0.04%; Cr: 0.01-0.015%.

[0016] The inoculant is a long-acting silicon-barium-calcium inoculant or a sulfur-oxygen inoculant.

[0017] During the stress relief tempering process, the temperature is 500-600℃, and the temperature is maintained for 10-15 hours. After heating is stopped and the temperature is cooled to 100-150℃, the furnace door is opened halfway, and the temperature is lowered to 30-50℃. The furnace is then hoisted out of the furnace for secondary shot blasting.

[0018] The method for preparing the suspending agent is as follows:

[0019] H1: By weight, add 100-120 parts of bentonite and 1000-1200 parts of deionized water to a stirred tank. Add pH adjusting solution to adjust the pH to 7-12. Stir and react at 50-70℃ for 100-160 minutes. Then add 5-8 parts of unsaturated quaternary ammonium salt and 0.05-0.25 parts of N-allyl-3-pyridineamine. Continue to react for 100-120 minutes. After centrifugation and drying, intercalation-modified montmorillonite is obtained.

[0020] H2: Add 100-150 parts of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 5-10 parts of sodium ethoxide, 500-700 parts of ethanol, and 60-70 parts of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 60-70°C for 100-160 minutes. Then add 0.05-0.5 parts of 1-butyl-3-methylimidazolium chloride and stir at 60-70°C for 100-130 minutes. After centrifugation and drying, a suspension is obtained.

[0021] The unsaturated quaternary ammonium salt includes: methacryloyloxyethyltrimethylammonium chloride, dimethyl diallyl ammonium chloride, or diallyl-N-carbonylbutoxymethylammonium chloride.

[0022] Suspension preparation mechanism

[0023] (1) Unsaturated quaternary ammonium salt, N-allyl-3-pyridineamine, was used to intercalate and modify montmorillonite to obtain intercalated modified montmorillonite;

[0024] (2) Amino-terminated polyvinyl alcohol undergoes an amino-propylene addition reaction with intercalated modified montmorillonite;

[0025] (3) 1-Butyl-3-methylimidazolium chloride salt was further modified by intercalation to obtain a suspending agent.

[0026] Technical effect

[0027] Compared with the prior art, the present invention has the following significant advantages:

[0028] 1. The coating prepared by this invention has a smooth surface, uniform distribution of each component, tight bonding, and no aggregation. The pores formed between the coating powder particles provide a channel for the smooth discharge of liquid and gaseous products generated during casting, effectively improving the high-temperature permeability of the coating, ensuring the stability of the filling of the molten metal during casting, and preventing the generation of porosity and carbon defects on the surface of the casting.

[0029] 2. The lost foam casting process for machine tool wear-resistant parts of the present invention produces castings with a hardness range of HB193-212, with the machining chips forming rolls, good machinability, rigidity meeting design requirements, and consistent surface gloss and uniform density after finishing.

[0030] 3. The suspending agent prepared by this invention can prevent solid refractory materials from precipitating in the coating. The molecular weight of the intercalated polymer in the suspending agent increases after cross-linking. The high molecular weight polymer can effectively expand the interlayer spacing of bentonite. Bentonite, which exists in the form of granular powder, becomes oleophilic and hydrophobic after intercalation, which overcomes the surface activity energy and prevents agglomeration. It can effectively prevent solid refractory materials from precipitating from the coating. Detailed Implementation

[0031] The present invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the present invention in any way. Example 1

[0032] A lost foam casting process for wear-resistant machine tool parts includes the following steps: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining.

[0033] The coating is 3mm thick and is applied in 3 coats. The coating is prepared by mixing 30kg alumina powder, 30kg talc powder, 1kg cryolite powder, 3kg suspending agent, 2kg silica sol, 1kg sodium lignosulfonate, 0.5kg attapulgite, 0.05kg n-butanol, and 60kg water.

[0034] The drying temperature is 40℃ to ensure that each coat of paint dries completely.

[0035] During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

[0036] The casting temperature is 1450℃, the casting pressure is controlled at -0.05MPa, the molten iron level is controlled at 2 / 3 during the casting process, and the pressure is held for 10 minutes after casting is completed.

[0037] The molten iron is composed of 30 kg of 18# medium-manganese pig iron, 30 kg of A3 coiled steel, 5 kg of recycled material, and 0.1 kg of inoculant; the composition of the molten iron is C: 3.0%; Si: 1.6%; Mn: 0.9%; S: 0.06%; P: 0.03%; Cr: 0.01%.

[0038] The inoculant mentioned is a long-acting barium silicate-calcium inoculant.

[0039] During the stress relief tempering process, the temperature is 500℃, and the temperature is held for 10 hours. After heating is stopped and the temperature is cooled to 100℃, the furnace door is opened halfway, the temperature is lowered to 30℃, and the furnace is hoisted out for secondary shot blasting.

[0040] The method for preparing the suspending agent is as follows:

[0041] H1: 100 kg of bentonite and 1000 kg of deionized water were added to a stirred tank. The pH was adjusted to 7 with pH adjustment solution. The mixture was stirred at 50 °C for 100 minutes. Then, 5 kg of unsaturated quaternary ammonium salt and 0.05 kg of N-allyl-3-pyridineamine were added. The mixture was reacted for another 100 minutes. After centrifugation and drying, intercalation-modified montmorillonite was obtained.

[0042] H2: Add 100 kg of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 5 kg of sodium ethoxide, 500 kg of ethanol, and 60 kg of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 60°C for 100 minutes, then add 0.05 kg of 1-butyl-3-methylimidazolium chloride salt. Stir at 60°C for 100 minutes. After centrifugation and drying, a suspension is obtained.

[0043] The unsaturated quaternary ammonium salt is methacryloyloxyethyltrimethylammonium chloride. Example 2

[0044] A lost foam casting process for wear-resistant machine tool parts includes the following steps: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining.

[0045] The coating is 4mm thick and is applied in 3 coats. The coating is prepared by mixing 35kg alumina powder, 35kg talc powder, 2kg cryolite powder, 4kg suspending agent, 3kg silica sol, 2kg sodium lignosulfonate, 1kg attapulgite, 0.2kg n-butanol, and 65kg water.

[0046] The drying temperature is 45℃ to ensure that each coat of paint dries completely.

[0047] During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

[0048] The casting temperature is 1480℃, the casting pressure is controlled at -0.06MPa, the molten iron level is controlled at 2 / 3 during the casting process, and the pressure is held for 15 minutes after casting is completed.

[0049] The molten iron is composed of 35 kg of 18# medium-manganese pig iron, 35 kg of A3 coiled steel, 9 kg of recycled material, and 0.2 kg of inoculant; the composition of the molten iron is C: 3.0%; Si: 1.7%; Mn: 1%; S: 0.07%; P: 0.03%; Cr: 0.01%.

[0050] The inoculant mentioned is a long-acting barium silicate-calcium inoculant.

[0051] The stress-relieving tempering process is carried out at a temperature of 530℃ for 12 hours. After heating is stopped and the temperature is cooled to 110℃, the furnace door is opened halfway and the temperature is lowered to 35℃. The furnace is then hoisted out for secondary shot blasting.

[0052] The method for preparing the suspending agent is as follows:

[0053] H1: 105 kg of bentonite and 1050 kg of deionized water were added to a stirred tank. The pH was adjusted to 8 by adding pH adjustment solution. The mixture was stirred at 55°C for 120 minutes. Then, 6 kg of unsaturated quaternary ammonium salt and 0.1 kg of N-allyl-3-pyridineamine were added. The mixture was reacted for another 105 minutes. After centrifugation and drying, intercalation-modified montmorillonite was obtained.

[0054] H2: Add 110 kg of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 6 kg of sodium ethoxide, 550 kg of ethanol, and 64 kg of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 65°C for 120 minutes, then add 0.2 kg of 1-butyl-3-methylimidazolium chloride and stir at 65°C for 110 minutes. After centrifugation and drying, a suspension is obtained.

[0055] The unsaturated quaternary ammonium salt is dimethyl diallyl ammonium chloride. Example 3

[0056] A lost foam casting process for wear-resistant machine tool parts includes the following steps: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining.

[0057] The coating is 4mm thick and is applied in 3 coats. The coating is prepared by mixing 45kg alumina powder, 45kg talc powder, 4kg cryolite powder, 6kg suspending agent, 4kg silica sol, 3kg sodium lignosulfonate, 1.5kg attapulgite, 0.4kg n-butanol, and 75kg water.

[0058] The drying temperature is 50°C to ensure that each coat of paint dries completely.

[0059] During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

[0060] The casting temperature is 1530℃, the casting pressure is controlled at -0.06MPa, the molten iron level is controlled at 3 / 4 during the casting process, and the pressure is held for 15 minutes after casting is completed.

[0061] The molten iron is composed of 45 kg of 18# medium-manganese pig iron, 45 kg of A3 coiled steel, 13 kg of recycled material, and 0.4 kg of inoculant; the composition of the molten iron is C: 3.1%; Si: 1.7%; Mn: 1%; S: 0.07%; P: 0.04%; Cr: 0.015%.

[0062] The inoculant is a sulfur-oxygen inoculant.

[0063] The stress-relieving tempering process involves a temperature of 580℃ and a holding time of 14 hours. After heating is stopped and the temperature is cooled to 140℃, the furnace door is opened halfway to allow the temperature to drop to 45℃. The furnace is then hoisted out for secondary shot blasting.

[0064] The method for preparing the suspending agent is as follows:

[0065] H1: 115 kg of bentonite and 1150 kg of deionized water were added to a stirred tank. The pH was adjusted to 11 by adding pH adjustment solution. The mixture was stirred at 65°C for 140 minutes. Then, 7 kg of unsaturated quaternary ammonium salt and 0.2 kg of N-allyl-3-pyridineamine were added. The reaction was continued for 115 minutes. After centrifugation and drying, intercalation-modified montmorillonite was obtained.

[0066] H2: Add 140 kg of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 9 kg of sodium ethoxide, 650 kg of ethanol, and 68 kg of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 65°C for 140 minutes, then add 0.4 kg of 1-butyl-3-methylimidazolium chloride and stir at 65°C for 120 minutes. After centrifugation and drying, a suspension is obtained.

[0067] The unsaturated quaternary ammonium salt is dimethyl diallyl ammonium chloride. Example 4

[0068] A lost foam casting process for wear-resistant machine tool parts includes the following steps: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining.

[0069] The coating is 5mm thick and is applied in 3 coats. The coating is prepared by mixing 50kg alumina powder, 50kg talc powder, 5kg cryolite powder, 7kg suspending agent, 5kg silica sol, 4kg sodium lignosulfonate, 2kg attapulgite, 0.5kg n-butanol, and 80kg water.

[0070] The drying temperature is 55°C to ensure that each coat of paint dries completely.

[0071] During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

[0072] The casting temperature is 1550℃, the casting pressure is controlled at -0.07MPa, the molten iron level is controlled at 3 / 4 during the casting process, and the pressure is held for 20 minutes after casting is completed.

[0073] The molten iron is composed of 50 kg of 18# medium-manganese pig iron, 50 kg of A3 coiled steel, 15 kg of recycled material, and 0.5 kg of inoculant; the composition of the molten iron is C: 3.1%; Si: 1.8%; Mn: 1.1%; S: 0.08%; P: 0.04%; Cr: 0.015%.

[0074] The inoculant is a sulfur-oxygen inoculant.

[0075] The stress-relieving tempering process involves a temperature of 5600℃ and a holding time of 15 hours. After heating is stopped and the temperature is cooled to 150℃, the furnace door is opened halfway to allow the temperature to drop to 50℃. The furnace is then hoisted out for secondary shot blasting.

[0076] The method for preparing the suspending agent is as follows:

[0077] H1: 120 kg of bentonite and 1200 kg of deionized water were added to a stirred tank. The pH was adjusted to 12 by adding pH adjustment solution. The mixture was stirred at 70 °C for 160 minutes. Then, 8 kg of unsaturated quaternary ammonium salt and 0.25 kg of N-allyl-3-pyridineamine were added. The reaction was continued for 120 minutes. After centrifugation and drying, intercalation-modified montmorillonite was obtained.

[0078] H2: Add 150 kg of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 10 kg of sodium ethoxide, 700 kg of ethanol, and 70 kg of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 70°C for 160 minutes, then add 0.5 kg of 1-butyl-3-methylimidazolium chloride and stir at 70°C for 130 minutes. After centrifugation and drying, a suspension is obtained.

[0079] The unsaturated quaternary ammonium salt is diallyl-N-carbonylbutoxymethylammonium chloride.

[0080] Comparative Example 1

[0081] In this example, no suspending agent is added during the preparation process, but everything else remains the same as in Example 1.

[0082] Comparative Example 2

[0083] In this example, amino-terminated polyvinyl alcohol is not added during the preparation process, but everything else remains the same as in Example 1.

[0084] Comparative Example 3

[0085] In this example, 1-butyl-3-methylimidazolium chloride salt is not added during the preparation process, and everything else remains the same as in Example 1.

[0086] The standard detection method in this embodiment is as follows:

[0087] 1. The brushability of the coating was determined using an NDJ-3 rotary viscometer to measure the brushing index of the coating.

[0088] 2. Coating strength: First, apply the coating to the glass plate. After the coating dries, use a viscosity cup to drop sand onto the glass plate until the coating is broken and the glass plate is exposed. Finally, weigh the total mass of the dropped sand as a quantitative indicator to judge the surface strength of the coating.

[0089] 3. Hardness testing shall be performed in accordance with GB / T230.1—2004.

[0090] Table of test results

[0091] brushable Coating strength / g Appearance Hardness / HB Example 1 8.3 723.2 Consistent surface gloss 193 Example 2 8.5 729.5 Consistent surface gloss 199 Example 3 8.6 737.8 Consistent surface gloss 208 Example 4 8.8 741.6 Consistent surface gloss 212 Comparative Example 1 5.1 519.3 Inconsistent surface gloss 147 Comparative Example 2 6.7 567.9 Inconsistent surface gloss 163 Comparative Example 3 7.2 588.4 Inconsistent surface gloss 171

[0092] Based on the data analysis of the above embodiments and comparative examples, the lost foam casting process for machine tool wear-resistant parts of the present invention produces castings with a hardness range of HB193-212, good machinability, and consistent surface gloss after finishing; the coating prepared by the present invention has good brushability and high coating strength.

[0093] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A lost foam casting process for wear-resistant machine tool parts, the process flow of which is as follows: programming, cutting, mold making, process design, coating, drying, molding, casting, shot blasting, tempering to relieve stress, and machining; the coating thickness is 3-5mm, and it is sprayed in 3 coats; the coating is obtained by stirring 30-50 parts of alumina powder, 30-50 parts of talc powder, 1-5 parts of cryolite powder, 3-7 parts of suspending agent, 2-5 parts of silica sol, 1-4 parts of sodium lignosulfonate, 0.5-2 parts of attapulgite clay, 0.05-0.5 parts of n-butanol, and 60-80 parts of water; The method for preparing the suspending agent is as follows: H1: By weight, add 100-120 parts of bentonite and 1000-1200 parts of deionized water to a stirred tank. Add pH adjusting solution to adjust the pH to 7-12. Stir and react at 50-70℃ for 100-160 minutes. Then add 5-8 parts of unsaturated quaternary ammonium salt and 0.05-0.25 parts of N-allyl-3-pyridineamine. Continue to react for 100-120 minutes. After centrifugation and drying, intercalation-modified montmorillonite is obtained. H2: Add 100-150 parts of amino-terminated polyvinyl alcohol (ATPEG500, average molecular weight = 500), 5-10 parts of sodium ethoxide, 500-700 parts of ethanol, and 60-70 parts of intercalated modified montmorillonite to a stirred tank. Stir vigorously at 60-70°C for 100-160 minutes. Then add 0.05-0.5 parts of 1-butyl-3-methylimidazolium chloride and stir at 60-70°C for 100-130 minutes. After centrifugation and drying, a suspension is obtained.

2. The lost foam casting process for machine tool wear-resistant parts according to claim 1, characterized in that: The drying temperature is 40-55℃ to ensure that each coat of paint is dry.

3. The lost foam casting process for machine tool wear-resistant parts according to claim 1, characterized in that: During the molding process, the machining surface faces downwards, and a vacuum negative pressure tube is inserted inside the mold.

4. The lost foam casting process for machine tool wear-resistant parts according to claim 1, characterized in that: The casting temperature is 1450-1550℃, the casting pressure is controlled at -0.05 to -0.07MPa, the molten iron level is controlled at 2 / 3 to 3 / 4 during the casting process, and the pressure is held for 10-20 minutes after casting is completed.

5. The lost foam casting process for machine tool wear-resistant parts according to claim 4, characterized in that: The molten iron is composed of 30-50 parts of 18# medium-manganese type I pig iron, 30-50 parts of A3 coiled steel, 5-15 parts of recycled material, and 0.1-0.5 parts of inoculant; the composition of the molten iron is C: 3.0-3.1%; Si: 1.6-1.8%; Mn: 0.9-1.1%; S: 0.06-0.08%; P: 0.03-0.04%; Cr: 0.01-0.015%.

6. The lost foam casting process for machine tool wear-resistant parts according to claim 5, characterized in that: The inoculant is a long-acting silicon-barium-calcium inoculant or a sulfur-oxygen inoculant.

7. The lost foam casting process for machine tool wear-resistant parts according to claim 1, characterized in that: The stress-relieving tempering process is carried out at a temperature of 500-600℃ for 10-15 hours. After heating is stopped and the temperature is cooled to 100-150℃, the furnace door is opened halfway and the temperature is lowered to 30-50℃. The furnace is then hoisted out for secondary shot blasting.

8. The lost foam casting process for machine tool wear-resistant parts according to claim 1, characterized in that: The unsaturated quaternary ammonium salt includes: methacryloyloxyethyltrimethylammonium chloride, dimethyldiallylammonium chloride, or diallyl-N-carbonylbutoxymethylammonium chloride.