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Preparation method of superfine crystal lead-free delay element for detonator

A technology of ultra-fine grain and delay body, which is applied in the field of room temperature superplastic zinc-aluminum alloy delay body, can solve the problems of poor production safety, hidden danger of gas explosion, easy heating, etc., achieve high production safety, avoid lead pollution, and not easy Fracture effect

Inactive Publication Date: 2012-04-11
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the mine environment with gas, the easy oxidation of aluminum has become a hidden danger of gas explosion, which limits the use of aluminum extension bodies.
In actual production, the aluminum material is very easy to heat up during the drawing process of processing it into an extended body, and the production safety is poor
In addition, although aluminum alloy is a plastic material, it faces the problem of embrittlement when it is actually drawn to the specified size extension body, that is, the aluminum extension body is easy to break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0008] The preparation method of the ultra-fine grain lead-free delaying body for the detonator of the present invention, the steps are as follows:

[0009] The first step is to prepare ultra-fine-grained Zn-Al alloy billet tubes by means of casting, extrusion, rolling, and machining, and the material of the lead-free extension body is Zn-22Al alloy;

[0010] The second step is to draw or roll the ultra-fine grained Zn-Al alloy blank tube containing the delay medicine into a 3mm-6mm Zn-Al alloy tube;

[0011] The third step is cutting and packaging the produced Zn-Al alloy pipe into a Zn-Al alloy extension body.

[0012] Billet tube preparation methods include: continuous casting, sand casting, squeeze casting, liquid forging, cold extrusion, hot extrusion, rolling and machining or a combination of these methods, machining includes such as boring, drilling or car and other methods.

[0013] In the preparation method of the ultra-fine-grain lead-free extension body for the de...

Embodiment 1

[0018] 1) A Zn-22Al alloy round ingot with an outer diameter of 80 mm was prepared by continuous casting.

[0019] 2) Homogenization treatment: heat preservation at 300°C for 24 hours, cool with the furnace, and cool down to room temperature.

[0020] 3) Extrude the Zn-22Al alloy ingot at 250° C. to obtain a Zn-22Al alloy ultra-fine-grain billet tube with an outer diameter of 20 mm and an inner diameter of 12 mm, and cut it into 20 cm long.

[0021] 4) Fill a 20-cm-long Zn-22Al alloy ultra-fine-grained billet tube with 20 g of delay medicine, and seal both ends of the tube.

[0022] 5) Draw the Zn-22Al alloy ultra-fine-grain blank tube with delay medicine in the order of aperture 18mm, 16mm, 14mm, 12mm, 10mm, 8mm, 6mm, 4.6mm, and make the outer diameter 4.6mm, containing delay medicine Core Zn-22Al alloy extension body.

[0023] 6) According to the extension time, it needs to be cut into 3mm Zn-22Al alloy extension body.

Embodiment 2

[0025] 1) Sand casting method or liquid die forging method to prepare a Zn-22Al alloy square ingot with an external dimension of 50╳100╳300mm.

[0026] 2) Homogenization treatment: heat preservation at 250°C for 22 hours, quench in water, and cool down to room temperature.

[0027] 3) Roll the Zn-22Al alloy square ingot at 250°C to obtain a Zn-22Al alloy ultra-fine-grained slab with a thickness of 20mm, and machine it into a Zn-22Al alloy ultra-fine-grained billet tube with an outer diameter of 20mm and an inner diameter of 12mm , and cut into 30cm long.

[0028] 4) Fill a 30cm-long Zn-22Al alloy ultra-fine crystal billet tube with 30g of delay medicine, and seal both ends of the tube.

[0029] 5) Draw the Zn-22Al alloy ultra-fine-grain blank tube with delay medicine in the order of aperture 18mm, 16mm, 14mm, 12mm, 10mm, 8mm, 6mm, 4.6mm, and make the outer diameter 4.6mm, containing delay medicine Core Zn-22Al alloy extension body.

[0030] 6) According to the extension tim...

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Abstract

The invention discloses a preparation method of a superfine crystal lead-free delay element for a detonator. The preparation method comprises the following steps: firstly, preparing a superfine crystal Zn-Al alloy blank pipe by adopting casting, extrusion, rolling and machining; then drawing or rolling the superfine crystal Zn-Al alloy blank pipe with delay powder to form a Zn-Al alloy pipe; and finally, cutting and packaging the prepared Zn-Al alloy pipe so as to obtain the Zn-Al alloy delay element. Through using the technical scheme of the invention, lead pollution is avoided, use occasionis not limited, and production process is safer.

Description

technical field [0001] The invention relates to a lead-free delay body for a detonator, in particular to a method for changing a traditional lead delay body into a room-temperature superplastic zinc-aluminum alloy delay body. Background technique [0002] Due to the advantages of low melting point, good flexibility, and easy processing, lead and lead-based alloys have become a material widely used in the detonator industry, such as the production of delay bodies and the detection of detonating ability of detonators. However, lead is a heavy metal that seriously pollutes the environment. Lead element has a toxic effect on various tissues of the human body, which can cause damage to human intelligence, vision, movement, memory, language and other functions, and will endanger human hematopoietic function, immune function and endocrine function. system, digestive system, especially to pregnant women and children more toxic. After the explosive reaction of the lead-delayed body ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/16
Inventor 王经涛张新平鲍国钢刘大斌唐巍
Owner NANJING UNIV OF SCI & TECH
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