阅读说明：本技术 一种粉末冶金生产金属拉链的方法 (Method for producing metal zipper by powder metallurgy ) 是由 吴昆明 张传贵 李伟 于 2021-07-21 设计创作，主要内容包括：本发明涉及一种粉末冶金生产金属拉链的方法,包括以下步骤：步骤S1、回收金属粉末并进行除杂处理；步骤S2、配料,将除杂后的金属粉末与粘合剂充分搅拌混合形成金属粉末-粘合剂混合料；步骤S3、压制成型并形成内胚体,将金属粉末-粘合剂混合料在常温下压制成型,得到链牙内胚体、下止块内胚体和上止块内胚体；步骤S4、烧结成型,将链牙内胚体、下止块内胚体和上止块内胚体真空烧结成型,烧结温度为1100℃～1200℃,烧结时间为1.5h～2h。该粉末冶金生产金属拉链的方法,回收加工车间内产生的废弃金属粉末,减少金属资源的浪费且成本较低,制成的链牙、下止块和上止块具有强度高、重量轻且耐腐蚀,且外观和手感均较好,适用于制造羽绒服用的金属拉链。(The invention relates to a method for producing a metal zipper by powder metallurgy, which comprises the following steps: s1, recovering metal powder and removing impurities; s2, mixing, namely fully stirring and mixing the metal powder subjected to impurity removal and the adhesive to form a metal powder-adhesive mixture; s3, pressing and forming an inner blank, and pressing and forming the metal powder-adhesive mixture at normal temperature to obtain a zipper tooth inner blank, a lower stop block inner blank and an upper stop block inner blank; and step S4, sintering and forming, namely sintering and forming the zipper tooth inner blank, the lower stop block inner blank and the upper stop block inner blank in vacuum at the sintering temperature of 1100-1200 ℃ for 1.5-2 h. The method for producing the metal zipper through powder metallurgy has the advantages that waste metal powder generated in a processing workshop is recycled, waste of metal resources is reduced, the cost is low, the manufactured zipper teeth, the lower stop block and the upper stop block are high in strength, light in weight, corrosion-resistant, good in appearance and hand feeling and suitable for manufacturing the metal zipper for down clothes.)

1. A method for producing a metal zipper by powder metallurgy is characterized by comprising the following steps:

s1, recovering metal powder and removing impurities;

s2, mixing, namely fully stirring and mixing the metal powder subjected to impurity removal and the adhesive to form a metal powder-adhesive mixture;

s3, pressing and forming an inner blank, and pressing and forming the metal powder-adhesive mixture at normal temperature to obtain a zipper tooth inner blank, a lower stop block inner blank and an upper stop block inner blank;

step S4, sintering and forming, namely sintering and forming the inner blank body, the inner blank body of the lower stop block and the inner blank body of the upper stop block in vacuum at the sintering temperature of 1100-1200 ℃ for 1.5-2 h to obtain a semi-finished product of the zipper teeth, the semi-finished product of the lower stop block and the semi-finished product of the upper stop block;

step S5, surface treatment, namely respectively placing the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into a stirring tank for stirring, and continuously adding abrasive materials for grinding in the stirring process;

step S6, electroplating the outer surface of the inner blank body to form a finished product, putting the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into copper-containing electroplating solution, putting red copper into the copper-containing electroplating solution, and uniformly plating a layer of red copper layer outside the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block in an electroplating mode to obtain a finished product chain tooth, a finished product lower stop block and a finished product upper stop block;

and step S7, mounting the finished product zipper teeth, the finished product lower stop block and the finished product upper stop block on the zipper belt, and mounting the pull head to obtain the finished product zipper.

2. The method for producing a metal zipper through powder metallurgy according to claim 1, wherein the metal powder in the step S1 is brass powder, and the impurity removing process comprises the following steps:

1) placing the recovered brass powder into an adsorption cylinder made of magnet for sufficient vibration, and pouring out the brass powder from the adsorption cylinder after the iron powder doped in the brass powder is sufficiently adsorbed by the adsorption cylinder;

2) placing the brass powder subjected to adsorption treatment by the adsorption cylinder into clear water for full stirring and cleaning, and filtering and drying after cleaning;

3) and adding dilute sulfuric acid into the dried brass powder to remove the copper oxide doped in the brass powder.

3. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: the weight ratio of the brass powder in the brass powder-adhesive mixture is 99.0-99.7%.

4. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: controlling the vacuum degree to be 5 multiplied by 10 during vacuum sintering and forming in the step S4^-1Pa or less.

5. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: the grinding material added into the stirring tank for stirring the semi-finished zipper teeth in the step S5 is a mixture of ice particles and dry ice, the weight ratio of the grinding material to the semi-finished zipper teeth is 8:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.3 cm.

6. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: in the step S5, the grinding materials added to the stirring tank for stirring the semi-finished product lower stop block and the semi-finished product upper stop block are both mixtures of ice particles and dry ice, the weight ratio of the grinding materials to the semi-finished product lower stop block and the semi-finished product upper stop block is 12:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.5 cm.

7. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: and after the finished product of the zipper element is prepared in the step S6, waxing is carried out on the surface of the finished product of the zipper element, so that a wax layer is formed on the surface of the finished product of the zipper element.

8. The method for producing a metal slide fastener by powder metallurgy according to claim 1, wherein: and step S7, mounting the finished product zipper teeth, the finished product lower stop block and the finished product upper stop block on the chain belts, and mounting the sliders to obtain the finished product zipper.

Technical Field

The invention belongs to the technical field of zipper manufacturing, and particularly relates to a method for producing a metal zipper by powder metallurgy.

Background

Zippers (zippers), which are connectors for uniting or separating articles by means of a continuous arrangement of zipper teeth, are now widely used in clothing, bags, tents, etc.

The zipper is composed of zipper teeth, a zipper head, an upper stop and a lower stop (a front stop and a rear stop) or a locking piece and the like. The fastener elements are key parts, and directly determine the side pull strength of the zipper. Generally, a zipper has two fastener tapes, each fastener tape has a row of fastener elements, and the two rows of fastener elements are arranged in a staggered manner. The zipper teeth at two sides are clamped by the pull head, and the zipper teeth at two sides can be mutually meshed or separated by sliding the pull tab.

The zipper is divided into three types according to materials, including a nylon zipper, an injection molding zipper and a metal zipper.

At present, the most common zipper and the zipper which is most widely applied are injection-molded zippers, and the injection-molded zippers are widely popular due to the characteristics of low cost and good performance. The zipper injection molding machine mainly comprises a conveying device and an injection molding main machine, wherein the conveying device is used for moving a zipper belt of a zipper, and the injection molding main machine is used for performing injection molding on the zipper belt to form zipper teeth and obtain a finished zipper product.

The metal zipper is a zipper with zipper teeth, upper and lower stoppers and other structural components made of metal, compared with other types of zippers, the zipper teeth of the metal zipper are firm in texture but soft and smooth in use, at present, most of common metal zippers are made of copper materials, stainless steel, aluminum alloy and other materials, most of common metal zippers are made of formed materials through stamping forming, and manufacturers for producing the metal zippers by using metal powder are few.

Disclosure of Invention

The invention aims to solve the problems and provide a method for producing a metal zipper by powder metallurgy, which has a simple structure and reasonable design.

The invention realizes the purpose through the following technical scheme:

a method for producing a metal zipper by powder metallurgy, comprising the steps of:

s1, recovering metal powder and removing impurities;

s2, mixing, namely fully stirring and mixing the metal powder subjected to impurity removal and the adhesive to form a metal powder-adhesive mixture;

s3, pressing and forming an inner blank, and pressing and forming the metal powder-adhesive mixture at normal temperature to obtain a zipper tooth inner blank, a lower stop block inner blank and an upper stop block inner blank;

step S4, sintering and forming, namely sintering and forming the inner blank body, the inner blank body of the lower stop block and the inner blank body of the upper stop block in vacuum at the sintering temperature of 1100-1200 ℃ for 1.5-2 h to obtain a semi-finished product of the zipper teeth, the semi-finished product of the lower stop block and the semi-finished product of the upper stop block;

step S5, surface treatment, namely respectively placing the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into a stirring tank for stirring, and continuously adding abrasive materials for grinding in the stirring process;

step S6, electroplating the outer surface of the inner blank body to form a finished product, putting the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into copper-containing electroplating solution, putting red copper into the copper-containing electroplating solution, and uniformly plating a layer of red copper layer outside the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block in an electroplating mode to obtain a finished product chain tooth, a finished product lower stop block and a finished product upper stop block;

and step S7, mounting the finished product zipper teeth, the finished product lower stop block and the finished product upper stop block on the zipper belt, and mounting the pull head to obtain the finished product zipper.

As a further optimized scheme of the present invention, the metal powder in step S1 is brass powder, wherein the impurity removal process includes the following steps:

1) placing the recovered brass powder into an adsorption cylinder made of magnet for sufficient vibration, and pouring out the brass powder from the adsorption cylinder after the iron powder doped in the brass powder is sufficiently adsorbed by the adsorption cylinder;

2) placing the brass powder subjected to adsorption treatment by the adsorption cylinder into clear water for full stirring and cleaning, and filtering and drying after cleaning;

3) and adding dilute sulfuric acid into the dried brass powder to remove the copper oxide doped in the brass powder.

As a further optimization scheme of the invention, the weight ratio of the brass powder in the brass powder-adhesive mixture is 99.0-99.7%.

In a further preferred embodiment of the present invention, the vacuum degree is controlled to be 5X 10-1Pa or less during the vacuum sintering and forming in step S4.

As a further optimization scheme of the invention, the grinding material added into the stirring tank for stirring the semi-finished zipper teeth in the step S5 is a mixture of ice particles and dry ice, the weight ratio of the grinding material to the semi-finished zipper teeth is 8:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.3 cm.

As a further optimization scheme of the invention, the grinding materials added into the stirring tank for stirring the semi-finished product lower stop block and the semi-finished product upper stop block in the step S5 are both a mixture of ice particles and dry ice, the weight ratio of the grinding materials to the semi-finished product lower stop block and the semi-finished product upper stop block is 12:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.5 cm.

As a further optimized scheme of the present invention, after the finished fastener element is prepared in step S6, the surface of the finished fastener element is waxed, so that a wax layer is formed on the surface of the finished fastener element.

As a further optimization scheme of the present invention, in step S7, the finished product fastener elements, the finished product lower stop block, and the finished product upper stop block are mounted on the fastener tapes, and the finished product zipper is obtained after the slider is mounted.

The invention has the beneficial effects that:

1) the waste copper powder generated in the copper part production workshop is recovered and subjected to impurity removal treatment to be made into a raw material, so that the cost of manufacturing the zipper by adopting the finished copper material can be greatly reduced, and the waste of metal resources is also reduced;

2) according to the invention, the brass powder and the adhesive are mixed and then are pressed and formed to prepare the inner blank body, then the inner blank body is sintered at high temperature, the grinding material mixed by ice particles and dry ice is used for carrying out surface grinding treatment on the inner blank body with temperature after sintering, meanwhile, the inner blank body can be rapidly cooled, and the two working procedures are combined into one working procedure, so that the processing time is greatly shortened, the influence on the inner blank body is small, and the grinding effect is good;

3) according to the invention, the red copper layer is electroplated on the surface of the semi-finished product to form the copper-clad copper material, compared with the zipper teeth which are directly made of brass, the upper stop and the lower stop of the zipper teeth have higher strength, lighter weight and corrosion resistance, and the copper-clad copper zipper teeth are more suitable for the down jacket manufacturing industry.

Drawings

FIG. 1 is an overall flow diagram of the present invention.

Detailed Description

The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.

Example 1

As shown in fig. 1, a method for producing a metal zipper by powder metallurgy includes the steps of:

s1, recovering metal powder and removing impurities;

in step S1, the metal powder is brass powder, wherein the impurity removal process includes the following steps:

1) placing the recovered brass powder into an adsorption cylinder made of magnet for sufficient vibration, and pouring out the brass powder from the adsorption cylinder after the iron powder doped in the brass powder is sufficiently adsorbed by the adsorption cylinder; the method can sufficiently remove metal powder or metal particles such as iron doped in the brass powder and capable of being adsorbed by the magnet.

2) Placing the brass powder subjected to adsorption treatment by the adsorption cylinder into clear water for full stirring and cleaning, and filtering and drying after cleaning; the impurities such as dust doped in the brass powder can be fully removed.

3) And adding dilute sulfuric acid into the dried brass powder to remove the copper oxide doped in the brass powder.

Waste copper powder generated in a copper part production workshop is recovered and subjected to impurity removal treatment to be made into a raw material, so that the cost of manufacturing the zipper by adopting the finished copper material can be greatly reduced, and the waste of metal resources is also reduced.

S2, mixing, namely fully stirring and mixing the metal powder subjected to impurity removal and the adhesive to form a metal powder-adhesive mixture; the weight ratio of the brass powder in the brass powder-adhesive mixture is 99.0-99.7%.

S3, pressing and forming an inner blank, and pressing and forming the metal powder-adhesive mixture at normal temperature to obtain a zipper tooth inner blank, a lower stop block inner blank and an upper stop block inner blank;

when the metal powder-adhesive mixture is pressed and formed, the metal powder-adhesive mixture is filled into a pressing die of a powder forming machine for pressing, wherein the pressing die comprises dies for preparing the zipper teeth, the upper stop block and the lower stop block, and the actual size and shape of the die can be changed according to the actual production design.

Step S4, sintering and forming, namely sintering and forming the inner blank body, the inner blank body of the lower stop block and the inner blank body of the upper stop block in vacuum at the sintering temperature of 1100-1200 ℃ for 1.5-2 h to obtain a semi-finished product of the zipper teeth, the semi-finished product of the lower stop block and the semi-finished product of the upper stop block; in step S4, the vacuum degree is controlled to be 5X 10-1Pa or less during vacuum sintering molding.

Step S5, surface treatment, namely respectively placing the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into a stirring tank for stirring, and continuously adding abrasive materials for grinding in the stirring process;

the abrasive material added into the stirring tank for stirring the semi-finished zipper teeth in the step S5 is a mixture of ice particles and dry ice, the weight ratio of the abrasive material to the semi-finished zipper teeth is 8:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.3 cm.

In the step S5, the grinding materials added into the stirring tank for stirring the semi-finished product lower stop block and the semi-finished product upper stop block are both mixtures of ice particles and dry ice, the weight ratio of the grinding materials to the semi-finished product lower stop block and the semi-finished product upper stop block is 12:1, the weight ratio of the ice particles to the dry ice is 1:8, the dry ice and the ice particles are both spherical, and the particle size is 0.5 cm.

The abrasive material adopts the mixture of ice particles and dry ice to have following advantage, firstly can be to the semi-manufactured goods chain tooth of sintering, the stop block is gone up to semi-manufactured goods under the semi-manufactured goods and the stop block goes up to semi-manufactured goods carries out quick cooling, secondly can carry out abundant grinding to the surface of semi-manufactured goods chain tooth, the stop block is gone up to semi-manufactured goods and the stop block is gone up to semi-manufactured goods, can carry out abundant grinding to burr etc. that semi-manufactured goods chain tooth, stop block and semi-manufactured goods go up the surface formation of stop block under the semi-manufactured goods, prevent that its surface is irregular and cause the influence to the processing procedure in later stage, and will cool down and grind two processes and have the reduction production duration after together, increase production efficiency's effect.

Step S6, electroplating the outer surface of the inner blank body to form a finished product, putting the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block into copper-containing electroplating solution, putting red copper into the copper-containing electroplating solution, and uniformly plating a layer of red copper layer outside the semi-finished product chain tooth, the semi-finished product lower stop block and the semi-finished product upper stop block in an electroplating mode to obtain a finished product chain tooth, a finished product lower stop block and a finished product upper stop block; the surface of the semi-finished product is electroplated with a layer of red copper to form a copper-clad copper material, and compared with the chain teeth directly made of brass, the chain teeth have higher strength of upper stop and lower stop, are lighter in weight, have a corrosion-resistant effect, and are more suitable for the down jacket manufacturing industry.

In addition, after the finished fastener element is manufactured in step S6, the surface of the finished fastener element is waxed, so that a wax layer is formed on the surface of the finished fastener element, thereby increasing the smoothness of the fastener element in the using process and protecting the surface of the fastener element to a certain degree.

And step S7, mounting the finished product zipper teeth, the finished product lower stop block and the finished product upper stop block on the chain belts, and mounting the pull heads to obtain the finished product zipper.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.