CN111574313A

CN111574313A - Press mounting method of plastic explosive

Info

Publication number: CN111574313A
Application number: CN202010429575.0A
Authority: CN
Inventors: 张波; 晁慧; 郝玉荣; 刘文斌; 王霞; 李庆烈; 陈明磊; 赵江颖; 马骁; 王娜
Original assignee: GANSU YINGUANG CHEMICAL INDUSTRY GROUP CO LTD
Current assignee: GANSU YINGUANG CHEMICAL INDUSTRY GROUP CO LTD
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2020-08-25

Abstract

The invention provides a method for pressing plastic explosives, which comprises the steps of coating a thin layer of talcum powder on the inner wall of a die cylinder, the working surfaces of a base and a punch before pressing the plastic explosives, then pasting a layer of preservative film on the working surfaces of the base and the punch, and removing the preservative film from a explosive column after pressing and forming, wherein the working procedure can effectively prevent the plastic explosives from being pasted on the inner wall of the die cylinder, even the cross section of the pressed and formed explosive column is uneven, even the explosive column is broken, and the yield is improved to 90 percent from 10 percent. The plastic explosive column pressed and formed by the method has the advantages of high yield and good consistency, does not need mechanical processing, and can avoid accidents such as accidental deflagration and the like in later mechanical processing of the special-shaped plastic explosive.

Description

Press mounting method of plastic explosive

Technical Field

The invention belongs to the technical field of explosive forming, and particularly relates to a plastic explosive press-fitting method suitable for a one-way hydraulic press.

Background

The plastic explosive is plastic, oxygen-balanced and extremely safe, is used as a common explosive charge, is widely used for mining, oil extraction and lumbering in civil aspects, is particularly suitable for underwater explosion, building construction and the like, and can also be used for metal processing and geological exploration; in the military aspect, the explosive is widely used for filling bombs, digging shelters and scattered pit, and discharging mines in the war area, and can also be used for special charging of buildings, forts, traffic facilities and other military facilities behind enemies.

The plastic explosive looks like putty or dough, has plasticity, better consistency and stickness, easily takes place irreversible deformation under the exogenic action, easily bonds into a group or kneads into required shape each other, but its elasticity is great, because elastic reduction, so compressibility is generally poor, easily appear product defect, work efficiency low and yields low grade problem in the actual pressing process.

Disclosure of Invention

Technical problem to be solved

The invention provides a method for pressing plastic explosives, which aims to solve the technical problem of how to safely and reliably press special-shaped plastic explosives.

(II) technical scheme

In order to solve the technical problem, the invention provides a method for press-mounting a plastic explosive, which uses a press-mounting device for press-mounting, wherein the press-mounting device comprises a die withdrawing frame, a base, a die cylinder and a punch; the press fitting method comprises the following steps: coating a thin layer of talcum powder on the inner wall of the through hole of the die cylinder, the working surfaces of the base and the punch, and then pasting a layer of preservative film on the working surfaces of the base and the punch; placing the mold cylinder on a base, connecting the upper surface of a horizontal structure of the base with the lower end surface of the mold cylinder, and embedding a convex part on the horizontal structure into the lower end of a through hole of the mold cylinder; twisting the weighed plastic explosive into a ball, then loading the ball into a die cylinder, and stably loading the pressing part of the punch into the die cylinder; after the punch slowly falls and is stable, the press mounting device is placed at the appointed position of the press; pressing the explosive columns by using a press machine; and after the pressing is finished, placing the demolding frame on the operation platform, then placing the mold barrel on the demolding frame, aligning and stably placing the demolding frame and the mold barrel, enabling the punch to continuously move downwards, pushing out the plastic explosive formed by pressing from the lower end of the mold barrel, demolding through the demolding frame, and removing the preservative film to obtain a finished product of the explosive column.

Further, when the grain is pressed, the parameters of the press are 200KN of pressure, 400mm of lower deceleration position of the upper sliding block and 420mm of slow pressing position of the upper sliding block, the pressing is started, and when the set pressure is reached, the pressing is stopped and the pressure is maintained for 1 min.

And further, during die stripping, the parameters of the press are 1900KN, 360mm of lower deceleration position of the upper sliding block and 370mm of slow pressing position of the upper sliding block, the pressing procedures of fast-down, slow-down and slow-down pressurization are carried out, and the machine is stopped after the die stripping is finished.

(III) advantageous effects

Drawings

FIG. 1 is a schematic diagram of a main structure of a mold according to an embodiment of the present invention;

fig. 2 is a front sectional view of the mold releasing frame in the embodiment of the invention.

Detailed Description

In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.

This example provides a method for pressing a plastic explosive, which comprises pressing a C-4 explosive column, wherein the length of the explosive column is 50 + -3 mm, the width is 62 + -3 mm, the height is 100 + -3 mm, the weight is 500 + -5 g, and the surface is smooth and has no cracks. The press-fitting device used by the press-fitting device is structurally shown in figures 1 and 2 and comprises a die withdrawing frame 1, a base 2, a die cylinder 3 and a punch 5. Wherein, the appearance of a mould section of thick bamboo 3 is the cylinder structure, and square or other dysmorphism structure's through-hole is seted up to inside, and through-hole upper end aperture is less, and lower extreme aperture is great. The lower end of the die cylinder 3 is connected with the base 2, and plastic explosive 4 is filled into the upper end of the through hole and a punch 5 is arranged in the through hole. The base 2 is a horizontal structure, and a convex part is arranged in the center of the base and provided with a slender cylinder. The upper surface of the horizontal structure of the base 2 is connected with the lower end surface of the die cylinder 3, the convex part is embedded into the lower end of the through hole of the die cylinder 3, and the slender cylinder can enable the plastic explosive column formed by pressing to be inserted into the detonator. The punch 5 has a pressing portion inserted into the through hole of the die cylinder 3 and a pressure receiving portion located at an upper end of the pressing portion. The die withdrawing frame 1 is of an internal hollow structure, the top of the die withdrawing frame is provided with a groove for fixing the die cylinder 3, and the middle of the die withdrawing frame is provided with a die withdrawing hole corresponding to the position of the through hole of the die cylinder 3.

The method for carrying out plastic explosive press mounting by using the press mounting device specifically comprises the following steps:

step 1, equipment facility inspection: checking a press-mounting device used for pressing, and using the device after the appearance and overpressure test are both qualified; the press is checked and started, and the pressing parameters are set.

Step 2, assembling and pressing preparation of a press-fitting device: coating a thin layer of talcum powder on the inner wall of the die cylinder 3, the working surfaces of the base 2 and the punch 5, and then sticking a layer of preservative film on the working surfaces of the base 2 and the punch 5. And (3) placing the die cylinder 3 on the base 2, kneading the weighed plastic explosive sample into a ball, and then filling the ball into the die cylinder 3. And (3) stably installing the punch 5 into the die cylinder 3, placing the press-mounting device at the appointed position of the press after the punch 5 slowly falls stably, closing the explosion-proof door after the punch is stably placed, and preparing for pressing.

Step 3, pressing the explosive column: the parameters of the press are 200KN of pressure, 400mm of lower deceleration position of the upper sliding block and 420mm of slow pressing position of the upper sliding block, the pressing is started, and when the numerical control pressure display or the gauge pressure of an oil pressure gauge reaches the set pressure, the pressing is stopped and the pressure is maintained for 1 min. And (5) after the pressure maintaining is finished, the pressure of the press is released to zero, and the upper end surface of the punch is observed to be separated from the upper sliding block through a video, so that the pressing is finished.

Step 4, demolding: and after the pressure maintaining time is reached, releasing the pressure and returning, wherein the upper sliding block is separated from the die to press the base plate, the pressure is released to zero, and the return of the upper sliding block is in place. After the die withdrawing frame 1 is placed on the operation platform, the die cylinder 3 is placed on the die withdrawing frame 1, the die withdrawing frame 1 and the die cylinder 3 are aligned and stably placed, the punch 5 continuously moves downwards, the plastic explosive 4 formed by pressing is pushed out from the lower end of the die cylinder 3 and is withdrawn through the die withdrawing frame 1, and the preservative film is removed, so that a finished product of the explosive column is obtained. When the die is removed, parameters of the press are 1900KN, 360mm of lower deceleration position of the upper sliding block and 370mm of slow pressing position of the upper sliding block, and the press is subjected to fast-down, slow-down and slow-down pressing procedures, and is stopped after the die is removed through monitoring video.

The whole process of the press mounting method is convenient and simple to operate, and is safe and reliable.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A press-mounting method of a plastic explosive is characterized in that a press-mounting device is used for press-mounting, and the press-mounting device comprises a die withdrawing frame, a base, a die cylinder and a punch; the press fitting method comprises the following steps: coating a thin layer of talcum powder on the inner wall of the through hole of the die cylinder, the working surfaces of the base and the punch, and then pasting a layer of preservative film on the working surfaces of the base and the punch; placing the mold cylinder on a base, connecting the upper surface of a horizontal structure of the base with the lower end surface of the mold cylinder, and embedding a convex part on the horizontal structure into the lower end of a through hole of the mold cylinder; twisting the weighed plastic explosive into a ball, then loading the ball into a die cylinder, and stably loading the pressing part of the punch into the die cylinder; after the punch slowly falls and is stable, the press mounting device is placed at the appointed position of the press; pressing the explosive columns by using a press machine; and after the pressing is finished, placing the demolding frame on the operation platform, then placing the mold barrel on the demolding frame, aligning and stably placing the demolding frame and the mold barrel, enabling the punch to continuously move downwards, pushing out the plastic explosive formed by pressing from the lower end of the mold barrel, demolding through the demolding frame, and removing the preservative film to obtain a finished product of the explosive column.

2. A press-fitting method according to claim 1, wherein the press parameters in the pressing of the charge are 200KN, 400mm lower deceleration position of the upper slide, 420mm slow pressing position of the upper slide, the pressing is started, and when the set pressure is reached, the pressing is stopped and maintained for 1 min.

3. A press-fitting method according to claim 1, wherein during the die stripping, the press parameters are 1900KN, 360mm lower deceleration position of the upper slide block and 370mm slow pressing position of the upper slide block, and the press is stopped after the die stripping.