CN113547123B - Method for producing metal zipper by powder metallurgy - Google Patents

Abstract

The invention relates to a method for producing metal zippers by powder metallurgy, comprising the following steps: step S1, recovering metal powder and performing impurity removal treatment; step S2, batching, fully stirring and mixing the impurity-removed metal powder and binder to form a metal zipper Powder-adhesive mixture; step S3, pressing and forming an endomorph, pressing the metal powder-binder mixture at normal temperature to obtain the endomorph of the chain tooth, the endomorph of the bottom stop block and the top stop Block endomorph; step S4, sintering and forming, vacuum sintering the chain tooth endomorph, bottom stop endomorph and top stop endomorph, the sintering temperature is 1100°C-1200°C, and the sintering time is 1.5h- 2h. The method for producing metal zippers by powder metallurgy recycles the waste metal powder produced in the processing workshop, reduces the waste of metal resources and has low cost. Corrosion, and the appearance and feel are good, suitable for the manufacture of metal zippers for down jackets.

Description

A method for producing metal zippers by powder metallurgy

technical field

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

Background technique

A zipper is a connecting piece that relies on continuously arranged chain elements to merge or separate items. It is now widely used in clothing, bags, tents, etc.

The zipper is composed of chain teeth, sliders, upper and lower stops (front code and rear code) or locking pieces. Among them, the chain teeth are the key part, which directly determines the side pull strength of the zipper. Generally, the zipper has two chain belts, and each chain belt has a row of chain teeth respectively, and the two rows of chain teeth are arranged alternately. The slider clamps the chain elements on both sides, and slides with the help of the pull tab, so that the chain elements on both sides can be engaged or disengaged from each other.

There are three types of zippers according to materials, including nylon zippers, injection molded zippers, and metal zippers.

At present, the most common zipper and the most widely used zipper is the injection zipper. The injection zipper is widely welcomed because of its low cost and good performance. The zipper injection molding machine mainly includes a conveying device and an injection molding host. The conveying device is used to move the chain belt of the zipper, and the injection molding host is used to inject and form the chain elements on the chain belt and obtain the finished zipper.

The metal zipper is a zipper whose chain teeth, upper and lower stops and other structural parts are made of metal. Compared with other types of zippers, the chain teeth of the metal zipper are stronger, but it is more supple to use. The current common metal zipper Most of the materials are copper, stainless steel, aluminum alloy and other materials for production, and most of them are stamped and formed by forming materials. Few manufacturers use metal powder to produce metal zippers.

Contents of the invention

The object of the present invention is just to provide a kind of simple in structure, the method for a kind of powder metallurgy production metal zipper with reasonable design in order to solve the above problems.

The present invention achieves the above object through the following technical solutions:

A method for producing metal zippers by powder metallurgy, comprising the following steps:

Step S1, recovering the metal powder and performing impurity removal treatment;

Step S2, batching, fully stirring and mixing the removed metal powder and binder to form a metal powder-binder mixture;

Step S3, pressing and forming an endomorph, and pressing the metal powder-binder mixture at room temperature to obtain the endomorph of the fastener element, the endobody of the bottom stop and the endobody of the top stop;

Step S4, sintering molding, vacuum sintering and molding the chain element endomorph, the bottom stop endomorph and the top stop endomorph, the sintering temperature is 1100°C-1200°C, the sintering time is 1.5h-2h, and the semi-finished chain is obtained Teeth, semi-finished bottom stop block and semi-finished top stop block;

Step S5, surface treatment, put the semi-finished chain elements, the semi-finished bottom stop and the semi-finished top stop respectively into the mixing tank for stirring, and continuously add abrasives for grinding during the stirring process;

Step S6, the surface of the endomorph is electroplated to form a finished product, and the semi-finished chain teeth, the semi-finished bottom stop and the semi-finished top stop are placed in the copper-containing electroplating solution, and red copper is placed in the copper-containing electroplating solution, and the copper-containing electroplating solution is electroplated. A layer of red copper is uniformly covered on the outside of the semi-finished chain teeth, semi-finished bottom stop and semi-finished top stop to obtain finished chain teeth, finished bottom stops and finished top stops;

Step S7, installing the finished chain elements, the finished bottom stop and the finished top stop on the chain belt, and installing the slider to obtain the finished zipper.

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

1) Put the recovered brass powder into the adsorption cylinder made of magnetite for sufficient vibration. When the iron powder doped in the brass powder is fully absorbed by the adsorption cylinder, pour the brass powder out of the adsorption cylinder ;

2) Put the brass powder that has been adsorbed by the adsorption cylinder into clean water for sufficient stirring and cleaning, and then filter and dry after cleaning;

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

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

As a further optimization scheme of the present invention, during the vacuum sintering molding in the step S4, the degree of vacuum is controlled to be below 5×10 −1 Pa.

As a further optimization scheme of the present invention, the abrasive material added in the mixing tank for stirring the semi-finished chain teeth in the step S5 is a mixture of ice particles and dry ice, the weight ratio of the abrasive materials to the semi-finished chain teeth is 8:1, and the weight ratio of the ice particles to the dry ice The weight ratio is 1:8, the shape of dry ice and ice pellets are spherical, and the particle size is 0.3cm.

As a further optimization scheme of the present invention, in the step S5, the abrasive added in the stirring tank for stirring the semi-finished bottom stop and the semi-finished top stop is a mixture of ice particles and dry ice, and the abrasive is mixed with the semi-finished bottom stop and the semi-finished top stop. The weight ratio of the ice pellets and dry ice is 12:1, the weight of the ice pellets and the dry ice is 1:8, the shape of the dry ice and the ice pellets are both spherical, and the particle diameter is 0.5cm.

As a further optimization solution of the present invention, after the finished chain element is produced in the step S6, the surface thereof is waxed, so that a layer of wax layer is formed on the surface of the finished chain element.

As a further optimization scheme of the present invention, in the step S7, the finished chain element, the finished bottom stop block and the finished top stop block are installed on the chain belt, and the finished slide fastener is obtained after installing the slider. Specifically, the finished chain element is first Equidistant cross-clamping on a pair of chain belts, and then clamp the finished bottom stop block on the pair of chain belts so that the pair of chain belts are handed over at the finished product bottom stop block, and then clamp the finished product top stop blocks on the On a pair of chain belts, the slider is finally installed to obtain a finished zipper, and the finished bottom stop and finished top stop are both close to the finished chain teeth.

The beneficial effects of the present invention are:

1) The present invention recycles the waste copper powder produced in the copper parts production workshop, and makes it into raw materials after removing impurities, which can greatly reduce the cost of using finished copper materials to make zippers, and also reduce the waste of metal resources;

2) The present invention adopts brass powder and adhesive to mix and then presses to make endomorph to obtain endomorph, then carries out high-temperature sintering to endomorph, adopts the abrasive material mixed with ice grain and dry ice after sintering to have temperature endomorph The surface grinding treatment can also quickly cool down the endomorph, combining the two processes into one process, which greatly shortens the processing time, and has less impact on the endomorph, and the grinding effect is better;

3) The present invention electroplates a layer of red copper on the surface of the semi-finished product to form a copper-clad copper material. Compared with chain teeth and upper and lower stops directly made of brass, it has higher strength, lighter weight and corrosion resistance , more suitable for down jacket manufacturing industry.

Description of drawings

Fig. 1 is the overall flow chart of the present invention.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific embodiments are only used to further illustrate the application, and cannot be interpreted as limiting the protection scope of the application. The above application content makes some non-essential improvements and adjustments to this application.

Example 1

As shown in Figure 1, a kind of method of powder metallurgy production metal slide fastener comprises the following steps:

Step S1, recovering the metal powder and performing impurity removal treatment;

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

1) Put the recovered brass powder into the adsorption cylinder made of magnetite for sufficient vibration. When the iron powder doped in the brass powder is fully absorbed by the adsorption cylinder, pour the brass powder out of the adsorption cylinder ; It can fully remove metal powder or metal particles that can be adsorbed by magnets, such as iron doped in brass powder.

2) Put the brass powder that has been adsorbed by the adsorption cylinder into clean water for sufficient stirring and cleaning, and then filter and dry after cleaning; it can fully remove impurities such as dust doped in the brass powder.

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

Recycling the waste copper powder produced in the copper parts production workshop and making it into raw materials after removing impurities can greatly reduce the cost of using finished copper materials to make zippers, and also reduce the waste of metal resources.

Step S2, batching, fully stirring and mixing the removed metal powder and binder to form a metal powder-binder mixture; the weight ratio of brass powder in the brass powder-binder mixture is 99.0% to 99.7% %.

Step S3, pressing and forming an endomorph, and pressing the metal powder-binder mixture at room temperature to obtain the endomorph of the fastener element, the endobody of the bottom stop and the endobody of the top stop;

When pressing and forming, the metal powder-binder mixture is filled into the pressing mold of the powder molding machine for pressing, wherein the pressing mold includes the mold for preparing chain teeth, upper stop block, and lower stop block. It should be noted that the mold The actual size and shape can be changed according to the actual production design.

Step S4, sintering molding, vacuum sintering and molding the chain element endomorph, the bottom stop endomorph and the top stop endomorph, the sintering temperature is 1100°C-1200°C, the sintering time is 1.5h-2h, and the semi-finished chain is obtained Teeth, semi-finished bottom stop block and semi-finished top stop block; when vacuum sintering and forming in step S4, the vacuum degree is controlled to be below 5×10-1Pa.

Step S5, surface treatment, put the semi-finished chain elements, the semi-finished bottom stop and the semi-finished top stop respectively into the mixing tank for stirring, and continuously add abrasives for grinding during the stirring process;

In step S5, the abrasive material added to the mixing tank for stirring the semi-finished chain teeth is a mixture of ice particles and dry ice, the weight ratio of abrasives to semi-finished chain teeth is 8:1, the weight ratio of ice particles to dry ice is 1:8, dry ice and ice The shapes of the particles are all spherical, and the particle diameter is 0.3 cm.

In step S5, the abrasive material added in the mixing tank for stirring the semi-finished bottom stop block and the semi-finished top stop block is a mixture of ice particles and dry ice, and the weight ratio of the abrasive material to the semi-finished bottom stop block and the semi-finished top stop block is 12:1. The weight of pellets and dry ice is 1:8, and the shape of dry ice and ice pellets is spherical, with a particle size of 0.5cm.

A mixture of ice grains and dry ice as the abrasive has the following advantages. First, it can quickly cool down the sintered semi-finished chain teeth, semi-finished bottom stop blocks and semi-finished top stop blocks. Second, it can cool semi-finished chain teeth, semi-finished bottom stop blocks and semi-finished products. The surface of the top stop is fully ground, which can fully grind the burrs formed on the surface of the semi-finished chain teeth, semi-finished bottom stop and semi-finished top stop, so as to prevent the irregular surface from affecting the later processing procedures, and Combining the two processes of cooling and grinding has the effect of reducing production time and increasing production efficiency.

Step S6, the surface of the endomorph is electroplated to form a finished product, and the semi-finished chain teeth, the semi-finished bottom stop and the semi-finished top stop are placed in the copper-containing electroplating solution, and red copper is placed in the copper-containing electroplating solution, and the copper-containing electroplating solution is electroplated. A layer of copper is uniformly applied on the outside of the semi-finished chain teeth, semi-finished bottom stop and semi-finished top stop to obtain finished chain teeth, finished bottom stops and finished top stops; a layer of copper is electroplated on the surface of the semi-finished product to form a copper clad Compared with chain teeth and upper and lower stops made directly of brass, the material of copper has higher strength, lighter weight and corrosion resistance, which is more suitable for the down jacket manufacturing industry.

Moreover, after the finished chain element is prepared in step S6, wax is applied to its surface, so that a layer of wax layer is formed on the surface of the finished chain element, which can increase the smoothness of the chain element during use, and can also polish the surface of the finished chain element. A certain level of protection.

Step S7: Install the finished chain elements, the finished bottom stop and the finished top stop on the chain belt, and install the slider to obtain the finished zipper. Specifically, the finished chain elements are equidistantly and cross-clamped on a pair of chains Put it on, then clamp the finished bottom stop on a pair of chain belts so that the pair of chain belts are handed over at the finished bottom stop, then clamp the finished top stop on the pair of chain belts, and finally install the slider A finished zipper is obtained with a finished bottom stop and a finished top stop that fit snugly against the finished teeth.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims (5)

1. A method for powder metallurgy production metal slide fastener, is characterized in that, comprises the following steps: Step S1, recovering the metal powder and performing impurity removal treatment; Wherein, the metal powder in step S1 is brass powder, wherein the impurity removal process includes the following steps: 1) Put the recovered brass powder into the adsorption cylinder made of magnetite for sufficient vibration. When the iron powder doped in the brass powder is fully absorbed by the adsorption cylinder, pour the brass powder out of the adsorption cylinder ; 2) Put the brass powder that has been adsorbed by the adsorption cylinder into clean water for sufficient stirring and cleaning, and then filter and dry after cleaning; 3), adding dilute sulfuric acid to the dried brass powder to remove copper oxide doped in the brass powder; Step S2, batching, fully stirring and mixing the removed metal powder and binder to form a metal powder-binder mixture; Step S3, pressing and forming an endomorph, and pressing the metal powder-binder mixture at room temperature to obtain the endomorph of the fastener element, the endobody of the bottom stop and the endobody of the top stop; Step S4, sintering molding, vacuum sintering and molding the chain element endomorph, the bottom stop endomorph and the top stop endomorph, the sintering temperature is 1100°C-1200°C, the sintering time is 1.5h-2h, and the semi-finished chain is obtained Teeth, semi-finished bottom stop block and semi-finished top stop block; Step S5, surface treatment, put the semi-finished chain elements, the semi-finished bottom stop and the semi-finished top stop respectively into the mixing tank for stirring, and continuously add abrasives for grinding during the stirring process; Wherein, in the step S5, the abrasive added in the mixing tank for stirring the semi-finished chain teeth is a mixture of ice particles and dry ice, the weight ratio of the abrasives to the semi-finished chain teeth is 8:1, and the weight ratio of ice particles to dry ice is 1:8 , the shapes of dry ice and ice particles are spherical, and the particle size is 0.3cm; Wherein, in the step S5, the abrasive material added in the stirring tank for stirring the semi-finished bottom stop block and the semi-finished top stop block is a mixture of ice particles and dry ice, and the weight ratio of the abrasive material to the semi-finished bottom stop block and the semi-finished top stop block is 12 :1, the weight of ice pellets and dry ice is 1:8, the shapes of dry ice and ice pellets are spherical, and the particle diameter is 0.5cm; Step S6, the surface of the endomorph is electroplated to form a finished product, and the semi-finished chain teeth, the semi-finished bottom stop and the semi-finished top stop are placed in the copper-containing electroplating solution, and red copper is placed in the copper-containing electroplating solution, and the copper-containing electroplating solution is electroplated. A layer of red copper is uniformly covered on the outside of the semi-finished chain teeth, semi-finished bottom stop and semi-finished top stop to obtain finished chain teeth, finished bottom stops and finished top stops; Step S7, installing the finished chain elements, the finished bottom stop and the finished top stop on the chain belt, and installing the slider to obtain the finished zipper. 2. A method for producing metal zippers by powder metallurgy according to claim 1, characterized in that: the weight proportion of brass powder in the brass powder-adhesive mixture is 99.0%-99.7%. 3. A method for producing metal zippers by powder metallurgy according to claim 1, characterized in that: during vacuum sintering molding in the step S4, the degree of vacuum is controlled to be below 5×10 ^-1 Pa. 4. The method for producing metal zippers by powder metallurgy according to claim 1, characterized in that: after the finished chain elements are prepared in the step S6, the surface is coated with wax, so that a layer is formed on the surface of the finished chain elements layer of wax. 5. A method for producing metal zippers by powder metallurgy according to claim 1, characterized in that: in the step S7, the finished chain elements, the finished bottom stop and the finished top stop are installed on the chain belt, and the After the head is pulled, the finished zipper is obtained. Specifically, the finished chain elements are equidistantly cross-clamped on a pair of chain belts, and then the finished bottom stop is clamped on a pair of chain belts so that the pair of chain belts are under the finished product. The stop block is handed over, and then the finished top stop block is respectively clamped on a pair of chain belts, and the slider is finally installed to obtain the finished zipper. The finished bottom stop block and the finished top stop block are both close to the finished chain teeth.

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