CN108746629B - Method for recycling waste feed of metal injection molding stainless steel - Google Patents
Method for recycling waste feed of metal injection molding stainless steel Download PDFInfo
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- CN108746629B CN108746629B CN201810662108.5A CN201810662108A CN108746629B CN 108746629 B CN108746629 B CN 108746629B CN 201810662108 A CN201810662108 A CN 201810662108A CN 108746629 B CN108746629 B CN 108746629B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
Abstract
The invention discloses a method for recycling waste feed of metal injection molding stainless steel, which relates to the field of metal powder metallurgy. And (3) carrying out injection molding, catalytic degreasing and sintering in inert atmosphere or vacuum condition on the recycled stainless steel waste feed to obtain a final sample. And testing the flow index, shrinkage ratio, sintered density, degreasing rate, hardness, green density, sintered density and tensile strength of the treated stainless steel waste feed and sintered samples to finally obtain the stainless steel injection molding waste recycled feed with qualified performance indexes.
Description
Technical Field
The invention relates to the field of metal powder metallurgy, in particular to a method for recycling waste materials generated in a forming process of stainless steel powder injection feeding.
Background
Metal powder Injection Molding (MIM) has the characteristics of one-step Molding of a product with a complicated shape, high dimensional precision of the product, no need of machining or only need of micro-machining, easy realization of production automation, and excellent product performance, and is internationally known as the most popular part forming technology in the 21 st century. With the development and progress of manufacturing technology, the market demand for metal parts is more and more vigorous, especially for metal injection molding products in the powder metallurgy industry.
The basic flow of metal injection molding is as follows: banburying, granulating, injection molding, degreasing and sintering. Wherein the particles obtained by banburying and granulation are called as feed, and the formula of the feed binder is the core of the whole metal injection molding; injection molding is the production of metal parts of various shapes from feedstock as the basic raw material, the quality of the feedstock determining the properties of the final product. The feed price is high, and injection opening and runner mouth of a river can both inevitably produce a large amount of abandonment feed in the injection process, if can recycle this waste material, then can reduce manufacturing cost by a wide margin, have very big economic benefits. The traditional recovery method is simple physical crushing, and the feed recovered by the method has poor flowability, unstable shrinkage, low sintered density and poor practical applicability. Therefore, solving the recycling of metal injection molding waste and efficiently utilizing efficiency is one of the core problems of the technology.
The above background disclosure is only for the purpose of assisting understanding of the concept and technical solution of the present invention and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide an effective method for recycling waste metal injection molding stainless steel feed, which verifies the performance of the treated feed by methods of injection molding, catalytic degreasing, sintering, testing of flow index, shrinkage ratio, sintering density, degreasing rate, hardness, green body density, sintering density, tensile strength and the like through researching the loss condition of each component of the stainless steel waste in the injection process, banburying again and adding the corresponding lost component, and realizes recycling of the waste feed.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for recycling waste feed of metal injection molding stainless steel is characterized by comprising the following steps:
step one, collecting stainless steel waste generated in the metal injection molding process, and crushing the stainless steel waste by a crusher;
step two, determining the total amount of the binder in the stainless steel waste material by thermogravimetric analysis TGA, catalytic degreasing weight loss and sintering weight loss methods;
thirdly, determining the types of the components of the binder in the stainless steel waste by infrared spectrum IR, liquid chromatography HPLC, gas chromatography GC, mass spectrum MS and nuclear magnetic NMR detection methods;
step four, determining the content of each component of the binder in the stainless steel waste through a method of programmed heating and weight loss in the vacuum sintering process of the crushed stainless steel waste;
step five, taking the standard injection molding stainless steel feed, and repeating the step two to the step four to obtain the content of each component of the binder in the standard injection molding stainless steel feed; comparing the content of each component of the stainless steel waste and the content of each component of the standard stainless steel feeding adhesive to obtain the content difference of each component of the adhesive in the stainless steel waste;
step six, putting the stainless steel waste into an internal mixer, and adding the content difference of each component of the binder obtained in the step five;
step seven, heating the stainless steel waste in the step six to a preset temperature in an internal mixer, melting and internally mixing for a preset time, and then granulating to obtain a treated and recycled stainless steel waste feed;
step eight, measuring the flow index of the stainless steel waste feed obtained in the step seven by using a melt index meter, and comparing the flow index with the flow index of a standard injection molding stainless steel feed to obtain the difference between the flow index of the stainless steel waste feed and the flow index of the standard injection molding stainless steel feed;
step nine, feeding and injecting the stainless steel waste obtained in the step seven into a green body, measuring the density of the stainless steel waste green body through a density meter, and comparing the density with a standard injection molding stainless steel green body to obtain the density difference between the stainless steel waste green body and the standard injection molding stainless steel green body;
tenthly, testing the density, the shrinkage ratio, the mechanical strength and the surface smoothness of the sintered sample by the stainless steel waste green body obtained in the step nine through inert atmosphere or vacuum sintering, and comparing the tested sample with a standard injection molding stainless steel green body to obtain the stainless steel waste with poor performance of the standard injection molding stainless steel;
step eleven, adjusting and repeating the step six to the step ten until the performance of the recycled stainless steel waste material feed reaches the same density, shrinkage ratio, mechanical strength and surface finish as the standard injection molding stainless steel feed.
Wherein the stainless steel waste is 316 stainless steel, 316L stainless steel, 17-4PH stainless steel, 304L stainless steel, 321L stainless steel, 309S stainless steel, 310S stainless steel, 303 stainless steel, 302 stainless steel, 301 stainless steel, 202 stainless steel, 201 stainless steel or 430 stainless steel.
The adhesive component is any combination of a plurality of materials selected from high-density polyethylene (HDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), Polyformaldehyde (POM), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), Stearic Acid (SA), zinc Stearate (SZ), calcium stearate, magnesium stearate, polyacrylate, dioctyl phthalate (DOP), polyethylene wax, microcrystalline wax, palm wax, liquid paraffin, antioxidant 1010 or antioxidant BHT.
Wherein the stainless steel scrap shrinkage ratio is 1.150-1.170.
Wherein the catalytic degreasing mode is fuming nitric acid catalytic degreasing.
Wherein, in the banburying process, the banburying temperature is 175-200 ℃.
Wherein, in the banburying process, the banburying time is 30-60 min.
Through the design scheme, the invention can bring the following beneficial effects:
the method utilizes a plurality of characterization and detection means to determine the types and the contents of the components of the loss binder in the stainless steel waste, supplements the loss of the corresponding components, and then carries out banburying, extrusion and granulation to obtain the recycled stainless steel waste feed. And (3) carrying out injection molding, catalytic degreasing and sintering in inert atmosphere or vacuum condition on the recycled stainless steel waste feed to obtain a final sample. And testing the flow index, shrinkage ratio, sintered density, degreasing rate, hardness, green density, sintered density and tensile strength of the treated stainless steel waste feed and sintered samples to finally obtain the stainless steel injection molding waste recycled feed with qualified performance indexes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially. The invention is illustrated by the following examples, which are not intended to limit the invention.
Example 1
Collecting and crushing 316L stainless steel waste with a standard shrinkage ratio of 1.165 +/-0.05 to obtain powdery and granular materials, and carrying out thermogravimetric analysis (TGA), wherein the weight loss rate under an inert atmosphere is 7-10%, the weight loss rate of catalytic degreasing is 6-8%, and the weight loss rate of vacuum sintering is 7-10%, so that the total amount of the binder is 7-10%, the content of polyformaldehyde POM is 6-8%, and the content of other binder components is 1-2%.
The crushed 316L stainless steel waste is characterized by infrared spectrum IR, liquid chromatography HPLC, gas chromatography GC, mass spectrum MS and nuclear magnetic NMR detection methods, and the main components of the binder are polyformaldehyde POM, polypropylene PP, stearic acid SA, ethylene-vinyl acetate copolymer EVA and polyethylene wax.
Performing temperature programming and weight loss in the vacuum sintering process on the crushed 316L stainless steel waste to obtain the binder, wherein the content of each component in the binder is as follows: 6 to 8 percent of polyformaldehyde POM, 0.3 to 0.5 percent of polypropylene PP, 0.2 to 0.6 percent of ethylene-vinyl acetate copolymer EVA, 0.2 to 0.3 percent of stearic acid SA and 0.3 to 0.6 percent of polyethylene wax.
The standard 316L stainless steel with the standard shrinkage ratio of 1.165 +/-0.05 and the injection molding feed are characterized by the method, so that a small amount of polyformaldehyde POM is decomposed by heating and low-boiling-point components are volatilized in the injection molding process, and the content loss of each component is 0.1-0.5%. In order to improve the fluidity and plasticity of 316L stainless steel waste, 0.03-0.1% of polyformaldehyde POM, 0.01-0.05% of high density polyethylene HDPE, 0.01-0.03% of ethylene-vinyl acetate copolymer EVA, 0.01-0.03% of stearic acid SA, 0.02-0.05% of polyethylene wax and 0-0.01% of antioxidant 1010 are added according to the amount.
Weighing 20kg of 316L stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and supplementing 10g to 30g of polyformaldehyde POM, 5g to 15g of high-density polyethylene HDPE, 3g to 10g of ethylene-vinyl acetate copolymer EVA, 4g to 8g of stearic acid SA, 6g to 10g of polyethylene wax and 2g to 5g of antioxidant 1010; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was subjected to injection molding and the density of the injection molded article was measured to be 4.5g/cm3～5.2g/cm3The density of the sintered compact was 7.7g/cm3～7.8g/cm3The shrinkage ratio is 1.160-1.170, the melt mass flow rate MFR is 600g/10 min-1100 g/10min, the sintering hardness is 100HV 10-140 HV10, the tensile strength is 460 MPa-520 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of standard injection molding 316L stainless steel feed is completely reached, and the requirements of practical application production are met.
Example 2
The test method described in example 1, which recycles 17-4PH stainless steel scrap with a standard shrinkage ratio of 1.165 + -0.05, determines the content of each component in the binder as follows: 7 to 8 percent of polyformaldehyde POM, 0.3 to 0.5 percent of high density polyethylene HDPE, 0.2 to 0.5 percent of ethylene-vinyl acetate copolymer EVA, 0.1 to 0.2 percent of zinc stearate SZ and 0.4 to 0.7 percent of microcrystalline paraffin.
After the standard 17-4PH stainless steel injection molding feeding is compared, the standard shrinkage ratio of the 17-4PH stainless steel is 1.165 +/-0.05, 0.03-0.15% of polyformaldehyde POM, 0.01-0.07% of high density polyethylene HDPE, 0.01-0.05% of ethylene-vinyl acetate copolymer EVA, 0.02-0.04% of zinc stearate SZ, 0.05-0.08% of microcrystalline paraffin and 0-0.01% of antioxidant 1010 are added.
Weighing 40kg of 17-4PH stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and supplementing 12 g-60 g of polyformaldehyde POM, 4 g-28 g of high-density polyethylene HDPE, 4 g-20 g of ethylene-vinyl acetate copolymer EVA, 8 g-16 g of zinc stearate SZ, 20 g-32 g of microcrystalline paraffin and 2 g-4 g of antioxidant 1010; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was subjected to injection molding and the density of the injection molded article was measured to be 4.3g/cm3～5.0g/cm3The density of the sintered compact was 7.7g/cm3～7.8g/cm3The shrinkage ratio is 1.160-1.170, the melt mass flow rate MFR is 500g/10 min-1000 g/10min, the sintering hardness is 250HV 10-300 HV10, the tensile strength is 1000 MPa-1200 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of standard injection molding 17-4PH stainless steel feed is completely reached, and the requirements of practical application production are met.
Example 3
The test method described in example 1 was used to recycle 304L stainless steel scrap with a standard shrinkage ratio of 1.165. + -. 0.05, and the contents of the components in the binder were determined as follows: 8.3 to 9.0 percent of polyformaldehyde POM, 0.3 to 0.6 percent of medium density polyethylene MDPE, 0.2 to 0.3 percent of ethylene-vinyl acetate copolymer EVA, 0.1 to 0.2 percent of magnesium stearate, 0.1 to 0.3 percent of dioctyl phthalate DOP and 0.01 percent of antioxidant BHT.
After the injection molding feeding of the standard 304L stainless steel is compared, the standard shrinkage ratio of the 304L stainless steel is 1.165 +/-0.05, and 0.04-0.12 percent of polyformaldehyde POM, 0.03-0.05 percent of medium density polyethylene MDPE, 0.02-0.04 percent of ethylene-vinyl acetate copolymer EVA, 0.01-0.03 percent of magnesium stearate, 0.02-0.04 percent of palm wax and 0-0.01 percent of antioxidant BHT are added.
Weighing 30kg of 304L stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and supplementing 12g to 36g of polyformaldehyde POM, 9g to 15g of high-density polyethylene HDPE, 6g to 12g of ethylene-vinyl acetate copolymer EVA, 4g to 12g of magnesium stearate, 6g to 12g of palm wax and 1g to 3g of antioxidant BHT; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was injection molded and measuredThe density of the test injection blank is 4.5g/cm3～5.2g/cm3The density of the sintered compact was 7.8g/cm3～7.9g/cm3The shrinkage ratio is 1.160-1.170, the melt mass flow rate MFR is 600g/10 min-1200 g/10min, the sintering hardness is 170HV 10-200 HV10, the tensile strength is 500 MPa-600 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of the standard injection molding 304L stainless steel feed is completely achieved, and the requirement of practical application production is met.
Example 4
The test method described in example 1 was used to recycle 316L stainless steel scrap with a standard shrinkage ratio of 1.160 + -0.03, and the contents of the components in the adhesive were as follows: 6.5 to 7.5 percent of polyformaldehyde POM, 0.2 to 0.4 percent of medium density polyethylene MDPE, 0.2 to 0.5 percent of ethylene-vinyl acetate copolymer EVA, 0.2 to 0.3 percent of stearic acid SA, 0.3 to 0.5 percent of liquid paraffin and 0.01 percent of antioxidant 1010.
The 316L stainless steel injection molding feed with the standard shrinkage ratio of 1.160 +/-0.03 is characterized by the method, and a small amount of polyformaldehyde POM is subjected to thermal decomposition and low-boiling-point components are volatilized in the injection molding process, so that the content loss of each component is 0.1-0.4%. In order to improve the fluidity and plasticity of 316L stainless steel waste, 0.03-0.08 percent of polyformaldehyde POM, 0.02-0.04 percent of medium density polyethylene MDPE, 0.01-0.03 percent of ethylene-vinyl acetate copolymer EVA, 0.01-0.03 percent of stearic acid SA, 0.02-0.03 percent of liquid paraffin and 0-0.01 percent of antioxidant 1010 are added according to the amount.
Weighing 20kg of 316L stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and supplementing 6g to 16g of polyformaldehyde POM, 4g to 8g of medium density polyethylene MDPE, 2g to 6g of ethylene-vinyl acetate copolymer EVA, 2g to 6g of stearic acid SA, 3g to 6g of liquid paraffin and 1g to 3g of antioxidant 1010; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was subjected to injection molding and the density of the injection molded article was measured to be 4.4g/cm3～5.0g/cm3The density of the sintered compact was 7.7g/cm3～7.8g/cm3Contract ratio of 1.157 ℃1.163, the melt mass flow rate MFR is 600g/10 min-1100 g/10min, the sintering hardness is 100HV 10-140 HV10, the tensile strength is 455 MPa-510 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of the standard injection molding 316L stainless steel feed is completely reached, and the requirements of practical application production are met.
Example 5
The test method described in example 1, which recycles and treats 17-4PH stainless steel scrap with a standard shrinkage ratio of 1.160 + -0.03, determines the content of each component in the adhesive as follows: 6.5 to 7.5 percent of polyformaldehyde POM, 0.3 to 0.4 percent of high density polyethylene HDPE, 0.2 to 0.4 percent of ethylene-vinyl acetate copolymer EVA, 0.1 to 0.2 percent of zinc stearate SZ, 0.3 to 0.6 percent of polyethylene wax and 0.01 to 0.05 percent of antioxidant 1010.
After comparing with the standard 17-4PH stainless steel injection molding feed, the standard shrinkage ratio of the 17-4PH stainless steel is 1.160 +/-0.05, 0.06-0.12 percent of polyformaldehyde POM, 0.02-0.05 percent of high density polyethylene HDPE, 0.02-0.03 percent of ethylene-vinyl acetate copolymer EVA, 0.01-0.03 percent of zinc stearate SZ, 0.04-0.06 percent of polyethylene wax and 0-0.01 percent of antioxidant 1010 are added.
Weighing 40kg of 17-4PH stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and adding 24 g-48 g of polyformaldehyde POM, 8 g-20 g of high-density polyethylene HDPE, 8 g-12 g of ethylene-vinyl acetate copolymer EVA, 4 g-12 g of zinc stearate SZ, 16 g-24 g of polyethylene wax and 2 g-4 g of antioxidant BHT; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was subjected to injection molding and the density of the injection molded article was measured to be 4.2g/cm3～4.8g/cm3The density of the sintered compact was 7.7g/cm3～7.8g/cm3The shrinkage ratio is 1.157-1.163, the melt mass flow rate MFR is 600g/10 min-1200 g/10min, the sintering hardness is 250HV 10-300 HV10, the tensile strength is 950 MPa-1100 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of standard injection molding 17-4PH stainless steel feed is completely reached, and the requirements of practical application production are met.
Example 6
The test method described in example 1 was followed to recover 304L stainless steel scrap, the 304L stainless steel having a standard shrinkage ratio of 1.160 ± 0.03, and the contents of the components in the binder were determined as follows: 8.4 to 8.8 percent of polyformaldehyde POM, 0.3 to 0.5 percent of medium density polyethylene MDPE, 0.2 to 0.3 percent of ethylene-vinyl acetate copolymer EVA, 0.1 to 0.2 percent of magnesium stearate, 0.1 to 0.3 percent of dioctyl phthalate DOP and 0.01 percent of antioxidant BHT.
After comparing with the injection molding feed of standard 304L stainless steel, the standard shrinkage ratio of the 304L stainless steel is 1.160 +/-0.03, and 0.05-0.10 percent of polyformaldehyde POM, 0.03-0.04 percent of medium density polyethylene MDPE, 0.02-0.03 percent of ethylene-vinyl acetate copolymer EVA, 0.01-0.02 percent of magnesium stearate, 0.02-0.04 percent of microcrystalline paraffin and 0-0.01 percent of antioxidant BHT are added.
Weighing 30kg of 304L stainless steel injection port material, runner port material and residual leftover material into an internal mixer, and supplementing 15 g-30 g of polyformaldehyde POM, 9 g-12 g of high-density polyethylene HDPE, 6 g-9 g of ethylene-vinyl acetate copolymer EVA, 3 g-6 g of magnesium stearate, 6 g-12 g of microcrystalline paraffin and 1 g-3 g of antioxidant BHT; and (3) heating to 185-200 ℃, continuously banburying for 35-60 min after the materials are melted into a dough, and finally extruding and granulating.
The granulated feed was subjected to injection molding and the density of the injection molded article was measured to be 4.3g/cm3～5.0g/cm3The density of the sintered compact was 7.8g/cm3～7.9g/cm3The shrinkage ratio is 1.157-1.163, the melt mass flow rate MFR is 500g/10 min-1100 g/10min, the sintering hardness is 170HV 10-200 HV10, the tensile strength is 500 MPa-600 MPa, and the continuous injection frequency is more than or equal to 10 times, so that the performance index of the standard injection molding 304L stainless steel feed is completely reached, and the requirements of practical application production are met.
The shrinkage ratio of the metal injection molding stainless steel waste is not limited to 1.160-1.165, and other shrinkage ratios are also suitable for the invention.
The catalytic degreasing mode is fuming nitric acid catalytic degreasing.
In the banburying process, the banburying temperature is not limited to 185-200 ℃, and other banburying temperatures can also obtain qualified products.
In the banburying process, the banburying time is not limited to 35 min-60 min, and other banburying times can also obtain qualified products.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for recycling waste feed of metal injection molding stainless steel is characterized by comprising the following steps:
step one, collecting stainless steel waste generated in the metal injection molding process, and crushing the stainless steel waste by a crusher;
step two, determining the total amount of the binder in the stainless steel waste material by thermogravimetric analysis TGA, catalytic degreasing weight loss and sintering weight loss methods;
thirdly, determining the types of the components of the binder in the stainless steel waste by infrared spectrum IR, liquid chromatography HPLC, gas chromatography GC, mass spectrum MS and nuclear magnetic NMR detection methods;
step four, determining the content of each component of the binder in the stainless steel waste through a method of programmed heating and weight loss in the vacuum sintering process of the crushed stainless steel waste;
step five, taking the standard injection molding stainless steel feed, and repeating the step two to the step four to obtain the content of each component of the binder in the standard injection molding stainless steel feed; comparing the content of each component of the stainless steel waste and the content of each component of the standard stainless steel feeding adhesive to obtain the content difference of each component of the adhesive in the stainless steel waste;
step six, putting the stainless steel waste into an internal mixer, and adding the content difference of each component of the binder obtained in the step five;
step seven, heating the stainless steel waste in the step six to a preset temperature in an internal mixer, melting and internally mixing for a preset time, and then granulating to obtain a treated and recycled stainless steel waste feed;
step eight, measuring the flow index of the stainless steel waste feed obtained in the step seven by using a melt index meter, and comparing the flow index with the flow index of a standard injection molding stainless steel feed to obtain the difference between the flow index of the stainless steel waste feed and the flow index of the standard injection molding stainless steel feed;
step nine, feeding and injecting the stainless steel waste obtained in the step seven into a green body, measuring the density of the stainless steel waste green body through a density meter, and comparing the density with a standard injection molding stainless steel green body to obtain the density difference between the stainless steel waste green body and the standard injection molding stainless steel green body;
tenthly, testing the density, the shrinkage ratio, the mechanical strength and the surface smoothness of the sintered sample by the stainless steel waste green body obtained in the step nine through inert atmosphere or vacuum sintering, and comparing the tested sample with a standard injection molding stainless steel green body to obtain the stainless steel waste with poor performance of the standard injection molding stainless steel;
step eleven, adjusting and repeating the step six to the step ten until the performance of the recycled stainless steel waste material feed reaches the same density, shrinkage ratio, mechanical strength and surface finish as the standard injection molding stainless steel feed.
2. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: the stainless steel waste is 316 stainless steel, 316L stainless steel, 17-4PH stainless steel, 304L stainless steel, 321L stainless steel, 309S stainless steel, 310S stainless steel, 303 stainless steel, 302 stainless steel, 301 stainless steel, 202 stainless steel, 201 stainless steel or 430 stainless steel.
3. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: the binder component is any combination of a plurality of high-density polyethylene (HDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), Polyformaldehyde (POM), polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), Stearic Acid (SA), zinc Stearate (SZ), calcium stearate, magnesium stearate, polyacrylate, dioctyl phthalate (DOP), polyethylene wax, microcrystalline wax, palm wax, liquid paraffin, antioxidant 1010 or antioxidant BHT.
4. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: the stainless steel waste material shrinkage ratio is 1.150-1.170.
5. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: the catalytic degreasing mode is fuming nitric acid catalytic degreasing.
6. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: in the banburying process, the banburying temperature is 175-200 ℃.
7. The method for recycling waste feed of metal injection molding stainless steel according to claim 1, wherein the method comprises the following steps: in the banburying process, the banburying time is 30-60 min.
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| CN112517902B (en) * | 2019-09-17 | 2021-11-19 | 江苏骏派电子科技有限公司 | Recovery method of metal injection molding waste |
| CN111235513B (en) * | 2020-03-11 | 2022-04-05 | 太原理工大学 | Preparation method of magnetic stainless steel chip core composite steel |
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