CN102126009A - Die casting manufacturing process of aluminum alloy pump head - Google Patents

Abstract

The invention relates to a die casting manufacturing process of an aluminum alloy pump head. The process comprises the following steps: (1) raw material melting: transferring an aluminum alloy into a centralized natural gas melting furnace for melting the alloy; (2) vacuum die casting: pouring the molten aluminum alloy into a die cavity from a feed inlet of a die and meanwhile fully exhausting gas in the die cavity, and selecting low-speed, high-speed and pressurization parameters according to area of the feed inlet of the die, die casting weight, barrel size and pressurization ratio of a machine so as to perform die casting; (3) finishing the molded die casting part and removing burrs; (4) transferring the finished casting blank without the burrs into a machining center for machining; (5) washing the casting part machined in the machining center; and (6) packaging the washed casting part. By utilizing the process, the obtained aluminum alloy pump head passes continuous 72-hour no-leakage test under the pressure of 16MPa.

Description

A die-casting manufacturing process of an aluminum alloy pump head

technical field

The invention relates to the field of die-casting manufacturing, in particular to a die-casting manufacturing process of an aluminum alloy pump head capable of withstanding 16MPa.

Background technique

In the prior art, the material of the pump head is usually made of copper alloy, and its processing technology is as follows: blanking—material heating—stamping—deflashing—machining center processing—cleaning—packaging. The price of copper alloy is relatively high, so in order to reduce the cost, the material of the pump head began to turn to aluminum alloy. However, the rigidity of aluminum is not as strong as that of copper, so according to the processing technology of copper alloy pump head, the aluminum alloy pump head cannot withstand the pressure of 16MPa, so a new die-casting manufacturing process is urgently needed

Contents of the invention

The technical problem to be solved by the present invention is to provide a die-casting manufacturing process of an aluminum alloy pump head, so that the die-cast aluminum alloy pump head can be tested continuously for 72 hours under a pressure of 16Mpa without leaking.

The technical solution adopted by the present invention to solve the technical problem is to provide a die-casting manufacturing process of an aluminum alloy pump head, which includes the following steps:.

(1) Raw material chemical: send the aluminum alloy into the chemical material of the natural gas centralized melting furnace;

(2) Vacuum die-casting: Pour the chemically-treated aluminum alloy into the mold cavity from the mold inlet, and at the same time fully discharge the gas in the mold cavity. The supercharging ratio of the die-casting machine selects low speed, high speed and supercharging parameters for die casting;

(3) Deburring the castings formed by die casting;

(4) Transfer the casting blanks that have been sorted and deburred to the machining center for processing;

(5) Clean the castings processed by the machining center;

(6) Pack the cleaned castings.

In the step (1), the melt of the aluminum alloy after passing through the natural gas melting furnace is kept warm with a machine electric furnace, so that the temperature is controlled within ±5 degrees of the set temperature.

The step (2) also includes the steps of locally cooling the hot joints of the mould, and locally heating the cold joints of the mould.

The step (2) adopts a forced exhaust method to fully discharge the gas in the mold cavity.

A step of scrapping the first 50 authentic products is also included between the steps (2) and (3).

The aluminum alloy in the step (1) has not been treated with slag ladle and material head return.

Beneficial effect

Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: when the present invention is vacuum die-casting, the area of the feed port, the weight of the die-casting, the size of the barrel and the pressurization of the machine Select appropriate parameters such as low speed, high speed, and pressurization compared to other conditions to ensure sufficient casting pressure and appropriate filling speed to make the interior of the product dense, and the forced exhaust method is used for vacuum pumping to better seal the mold. The gas in the cavity is fully discharged at the moment of filling.

After the aluminum alloy is melted in a centralized natural gas melting furnace, the machine electric furnace is used to keep it warm, and the temperature is controlled at the set temperature ± 5 degrees, which can better control the shrinkage cavity inside the product and make the inside of the product denser. During the die-casting process, the thermal balance of the mold is guaranteed, so that the product shrinks uniformly, and local cooling and local heating are performed on the hot and cold joints of the mold. In order to ensure the consistency of the internal organization of the product, the first 50 mold products when the cold mold starts to be produced are scrapped.

Detailed ways

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The invention relates to a die-casting manufacturing process of an aluminum alloy pump head, comprising the following steps:

(1) Raw material chemical: Send the aluminum alloy to the natural gas centralized melting furnace to make the chemical material, and use the machine electric furnace to keep the melted liquid warm, so that the temperature can be controlled within ±5 degrees of the set temperature, which can be better It can accurately control the shrinkage cavity inside the product and make the inside of the product denser. In order to avoid slag inclusion and air entrainment in the product, A380 aluminum alloy is selected as the aluminum alloy material, and the slag bag and material head cannot be recycled for this aluminum alloy.

(2) Vacuum die-casting: pour the melted aluminum alloy into the mold cavity from the mold feed port, and at the same time fully discharge the gas in the mold cavity, and according to the area of the mold feed port, die-casting weight, and barrel The size and boost ratio of the machine are selected for die-casting with low speed, high speed, and boost parameters. Adjust the die-casting parameters under various conditions to ensure sufficient casting pressure and proper filling speed to make the product dense inside. The invention adopts a forced exhaust method-vacuum pumping to fully discharge the gas in the mold cavity at the moment when the aluminum alloy is filled. In order to make the product shrink uniformly, it is necessary to ensure the thermal balance of the mold during the die-casting process, that is, to perform local cooling treatment on the hot section of the mold and local heating treatment on the cold section of the mold.

(3) Deburring the die-casting castings.

(4) Transfer the deburred casting blank to the machining center for processing.

(5) Clean the castings processed by the machining center.

(6) Pack the cleaned castings.

In order to ensure the consistency of the internal organization of the product, the present invention scraps the first 50 genuine products when the cold mold starts to be produced.

Claims (6)

1. A die-casting manufacturing process of an aluminum alloy pump head, characterized in that, comprising the following steps: (1) Raw material chemical: send the aluminum alloy into the chemical material of the natural gas centralized melting furnace; (2) Vacuum die-casting: pour the melted aluminum alloy into the mold cavity from the mold feed port, and at the same time fully discharge the gas in the mold cavity, and according to the area of the mold feed port, die-casting weight, and barrel The size and boost ratio of the die-casting machine are selected for die-casting with low speed, high speed, and boost parameters; (3) Deburring the castings formed by die casting; (4) Transfer the casting blanks that have been sorted and deburred to the machining center for processing; (5) Clean the castings processed by the machining center; (6) Pack the cleaned castings. 2. The die-casting manufacturing process of the aluminum alloy pump head according to claim 1, characterized in that, in the step (1), the molten liquid after the aluminum alloy is passed through the natural gas melting furnace is kept insulated by a machine electric furnace, so that The temperature is controlled within ±5 degrees of the set temperature. 3. The die-casting manufacturing process of the aluminum alloy pump head according to claim 1, characterized in that, the step (2) also includes performing local cooling on the hot joints of the mould, and performing local cooling on the cold joints of the mould. Step of local heat treatment. 4. The die-casting manufacturing process of the aluminum alloy pump head according to claim 1, characterized in that, the step (2) uses a forced exhaust method to fully discharge the gas in the mold cavity. 5. The die-casting manufacturing process of the aluminum alloy pump head according to claim 1, characterized in that, between said step (2) and step (3), it also includes scrapping 50 products after the cold mold is turned on processing steps. 6. The die-casting manufacturing process of the aluminum alloy pump head according to claim 1, characterized in that the aluminum alloy in the step (1) has not been treated with slag ladle and feed head return.