阅读说明：本技术 一种防腐防锈的刀剪生产用粉末注射制造方法 (Powder injection manufacturing method for producing anticorrosive and antirust knife scissors ) 是由 莫仕栋 何冰强 吴远谋 谢月光 陈六庆 于 2021-08-11 设计创作，主要内容包括：本发明公开了刀剪生产技术领域中的一种防腐防锈的刀剪生产用粉末注射制造方法,包括制作刀剪用的合金粉末、将合金粉末和有机粘结剂均匀混炼,形成混合原料、将混合原料制粒后进行加热塑化,制成注射用喂料、将喂料通过注射成形机注入刀剪模具内形成刀剪胚体、对刀剪胚体进行脱脂处理、对脱脂处理后的刀剪胚体进行真空烧结处理、对真空烧结处理后的刀剪胚体进行后处理；本发明生产的刀剪胚体烧结后收缩稳定,不易变形,精度较高,同时在生产时内部添加了Cr、Mo、Ti和Co金属粉末,极大的提高了刀剪的防腐防锈能力以及硬度,有效的提高了刀剪的质量。(The invention discloses a powder injection manufacturing method for producing an anticorrosive and antirust knife shear, which belongs to the technical field of knife shear production, and comprises the steps of manufacturing alloy powder for the knife shear, uniformly mixing the alloy powder and an organic binder to form a mixed raw material, granulating the mixed raw material, heating and plasticizing to prepare a feed for injection, injecting the feed into a knife shear die through an injection molding machine to form a knife shear blank body, degreasing the knife shear blank body, performing vacuum sintering treatment on the degreased knife shear blank body, and performing post-treatment on the vacuum sintered knife shear blank body; the blank body of the knife and scissors produced by the invention has stable shrinkage after sintering, is not easy to deform and has higher precision, and meanwhile, metal powder of Cr, Mo, Ti and Co is added in the production process, so that the corrosion resistance and rust resistance and hardness of the knife and scissors are greatly improved, and the quality of the knife and scissors is effectively improved.)

1. The powder injection manufacturing method for producing the anticorrosive and antirust knife scissors is characterized by comprising the following steps of:

the method comprises the following steps: manufacturing alloy powder for the knife and the scissors;

step two: uniformly mixing alloy powder and an organic binder to form a mixed raw material;

step three: granulating the mixed raw materials, and then heating and plasticizing to prepare the feed for injection;

step four: injecting the feed material into a cutting die through an injection molding machine to form a cutting blank body;

step five: degreasing the cutter shearing blank;

step six: carrying out vacuum sintering treatment on the degreased knife-scissors blank;

step seven: and carrying out post-treatment on the cutting blank body subjected to the vacuum sintering treatment.

2. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: the formula of the alloy powder in the first step is as follows: cr: 12% -15%; ni: 16% -18%; mo: 5% -7%; ti: 0.5% -1%; co: 8% -10%; the balance being Fe.

3. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: the organic binder in the second step comprises the following components: 5-8% of paraffin, 5-10% of polyethylene wax, 6-8% of polyester modified wax, 3-5% of oxidized polyethylene wax, 8-15% of polypropylene and 60-75% of polyformaldehyde.

4. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: the ratio of the alloy powder to the organic binder in the second step is 3: 1-2: 1.

5. the powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: the degreasing treatment in the fifth step is to perform catalytic degreasing on the blank body of the knife scissors for 3-12 hours at 110-130 ℃ in an acid atmosphere; and after drying, carrying out negative pressure thermal degreasing at 400-600 ℃ under the protection of nitrogen atmosphere for 1-3 h.

6. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: and the step six, the vacuum sintering treatment refers to sintering the degreased knife-scissors blank for 1-2 hours in a vacuum environment, wherein the sintering temperature is 1200-1500 ℃.

7. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: and the post-treatment in the seventh step comprises quenching and edging treatment.

8. The powder injection manufacturing method for producing corrosion-resistant and rust-resistant knives and scissors according to claim 1, characterized in that: the metal powder particle size of the alloy powder in the first step is 10-20 mu m.

Technical Field

The invention relates to the technical field of knife and scissors production, in particular to a powder injection manufacturing method for producing anticorrosive and antirust knife and scissors.

Background

The metal powder injection molding technology is a new revolution of the manufacturing technology industry, and integrates the multi-disciplinary transparent and crossed products of plastic molding technology, polymer chemistry, powder metallurgy technology, metal material science and the like, a blank can be injected and molded by using a mold, a structural part with high density, high precision and three-dimensional complex shape can be rapidly manufactured by sintering, the design idea can be rapidly and accurately materialized into a product with certain structure and functional characteristics, the part can be directly produced in batch. The process technology not only has the advantages of less working procedures, no cutting or less cutting, high economic benefit and the like of the conventional powder metallurgy process, but also overcomes the defects of uneven material, low mechanical property, difficult thin wall forming and complex structure of the traditional powder metallurgy process product, and is particularly suitable for mass production of small and complex metal parts with special requirements. The technological process of binding → mixing → injection molding → degreasing → sintering → post-treatment.

The existing manufacturing process of the knife scissors has the disadvantages of low size precision of the manufactured knife scissors, easy deformation during sintering, post-treatment, large whole process personnel configuration and equipment investment amount, high corresponding cost, difficult control of product appearance, reduced product performance due to process reasons, high cost and complicated procedures because anticorrosive and antirust materials are coated on the surfaces of the knife scissors to ensure the service life of the knife scissors.

Therefore, the invention provides a powder injection manufacturing method for producing anticorrosive and antirust knife scissors, which aims to solve the problems.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a powder injection manufacturing method for producing an anticorrosive and antirust knife and scissors, which aims to solve the problems.

In order to achieve the purpose, the invention is realized by the following technical scheme: a powder injection manufacturing method for producing anticorrosive and antirust knife scissors comprises the following steps:

the method comprises the following steps: manufacturing alloy powder for the knife and the scissors;

step two: uniformly mixing alloy powder and an organic binder to form a mixed raw material;

step three: granulating the mixed raw materials, and then heating and plasticizing to prepare the feed for injection;

step four: injecting the feed material into a cutting die through an injection molding machine to form a cutting blank body;

step five: degreasing the cutter shearing blank;

step six: carrying out vacuum sintering treatment on the degreased knife-scissors blank;

step seven: and carrying out post-treatment on the cutting blank body subjected to the vacuum sintering treatment.

Preferably, the formula of the alloy powder in the first step is as follows: cr: 12% -15%; ni: 16% -18%; mo: 5% -7%; ti: 0.5% -1%; co: 8% -10%; the balance being Fe.

Preferably, the organic binder in the second step comprises the following components: 5-8% of paraffin, 5-10% of polyethylene wax, 6-8% of polyester modified wax, 3-5% of oxidized polyethylene wax, 8-15% of polypropylene and 60-75% of polyformaldehyde.

Preferably, the ratio of the alloy powder to the organic binder in the second step is 3: 1-2: 1.

preferably, the degreasing treatment in the fifth step is to perform catalytic degreasing on the blank body of the knife scissors for 3-12 hours at 110-130 ℃ in an acid atmosphere; and after drying, carrying out negative pressure thermal degreasing at 400-600 ℃ under the protection of nitrogen atmosphere for 1-3 h.

Preferably, the vacuum sintering treatment in the sixth step is to sinter the degreased knife-scissors blank for 1-2 hours in a vacuum environment, wherein the sintering temperature is 1200-1500 ℃.

Preferably, the post-treatment in the seventh step comprises quenching and edging treatment.

Preferably, the metal powder particle size of the alloy powder in the first step is 10-20 μm.

Advantageous effects

The invention provides a powder injection manufacturing method for producing anticorrosive and antirust knives and scissors. Compared with the prior art, the method has the following beneficial effects: the blank body of the knife and scissors produced by the invention has stable shrinkage after sintering, is not easy to deform and has higher precision, and meanwhile, metal powder of Cr, Mo, Ti and Co is added in the production process, so that the corrosion resistance and rust resistance and hardness of the knife and scissors are greatly improved, and the quality of the knife and scissors is effectively improved.

Drawings

FIG. 1 is a flow chart of the method of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1, a method for manufacturing powder injection for producing anticorrosive and antirust scissors includes the following steps:

the method comprises the following steps: manufacturing alloy powder for the knife and the scissors;

step two: uniformly mixing alloy powder and an organic binder to form a mixed raw material;

step three: granulating the mixed raw materials, and then heating and plasticizing to prepare the feed for injection;

step four: injecting the feed material into a cutting die through an injection molding machine to form a cutting blank body;

step five: degreasing the cutter shearing blank;

step six: carrying out vacuum sintering treatment on the degreased knife-scissors blank;

step seven: and carrying out post-treatment on the cutting blank body subjected to the vacuum sintering treatment.

The formula of the alloy powder in the first step is as follows: cr: 12 percent; ni: 16 percent; mo: 5 percent; ti: 0.5 percent; co: 8 percent; the balance of Fe;

the organic binder in the second step comprises the following components: 5% of paraffin, 5% of polyethylene wax, 6% of polyester modified wax, 3% of oxidized polyethylene wax, 8% of polypropylene and 73% of polyformaldehyde;

in the second step, the ratio of the alloy powder to the organic binder is 3: 1;

the step five of degreasing treatment refers to that the blank body of the knife scissors is catalytically degreased for 8 hours at 110 ℃ in an acid atmosphere; after drying, carrying out negative pressure thermal degreasing at 600 ℃ under the protection of nitrogen atmosphere for 1 h;

the step six, vacuum sintering treatment refers to sintering the degreased knife shear blank for 2 hours in a vacuum environment, wherein the sintering temperature is 1400 ℃;

the post-treatment in the seventh step comprises quenching and edging treatment;

the metal powder particle size of the alloy powder in step one was 10 μm.

The test shows that the hardness of the cutter of the embodiment is 57HRC, and the corrosion resistance is good.

Example 2:

referring to fig. 1, a method for manufacturing powder injection for producing anticorrosive and antirust scissors includes the following steps:

the method comprises the following steps: manufacturing alloy powder for the knife and the scissors;

step two: uniformly mixing alloy powder and an organic binder to form a mixed raw material;

step three: granulating the mixed raw materials, and then heating and plasticizing to prepare the feed for injection;

step four: injecting the feed material into a cutting die through an injection molding machine to form a cutting blank body;

step five: degreasing the cutter shearing blank;

step six: carrying out vacuum sintering treatment on the degreased knife-scissors blank;

step seven: and carrying out post-treatment on the cutting blank body subjected to the vacuum sintering treatment.

The formula of the alloy powder in the first step is as follows: cr: 15 percent; ni: 18 percent; mo: 7 percent; ti: 1 percent; co: 10 percent; the balance of Fe;

the organic binder in the second step comprises the following components: 8% of paraffin, 10% of polyethylene wax, 8% of polyester modified wax, 5% of oxidized polyethylene wax, 9% of polypropylene and 60% of polyformaldehyde;

in the second step, the ratio of the alloy powder to the organic binder is 2: 1;

the step five of degreasing treatment refers to that the blank body of the knife scissors is catalytically degreased for 5 hours at 130 ℃ in an acid atmosphere; after drying, carrying out negative pressure thermal degreasing at 600 ℃ under the protection of nitrogen atmosphere for 2 h;

the step six, vacuum sintering treatment refers to sintering the degreased knife-shear blank for 2 hours in a vacuum environment, wherein the sintering temperature is 1500 ℃;

the post-treatment in the seventh step comprises quenching and edging treatment;

the metal powder particle size of the alloy powder in step one was 10 μm.

The test shows that the hardness of the cutter of the embodiment is 60HRC, and the corrosion resistance is good.

And those not described in detail in this specification are well within the skill of those in the art.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.