阅读说明：本技术 一种火工品封接体用长玻璃管压制成型方法 (Pressing and forming method for long glass tube for initiating explosive device sealing body ) 是由 刘东东 何战宁 韩淇文 李疆 刘鑫 谢晋 于 2021-08-30 设计创作，主要内容包括：一种火工品封接体用长玻璃管压制成型方法,包括如下步骤：玻璃粉过筛；玻璃管坯压制成型：制作制坯模具,采用制坯模具将经过过筛的玻璃粉压制成规定尺寸的玻璃管坯；玻璃管坯排粘预烧,形成具有一定机械强度可用于封接体装配的长玻璃管。能够解决短玻璃管拼装造成的装配效率低、人工成本高、封接体外观及电性能差的问题。(A long glass tube pressing and forming method for an initiating explosive device sealing body comprises the following steps: sieving the glass powder; pressing and forming a glass tube blank: manufacturing a blank making mold, and pressing the sieved glass powder into a glass tube blank with a specified size by adopting the blank making mold; the glass tube blank is arranged and bonded for pre-burning to form a long glass tube which has certain mechanical strength and can be used for assembling the sealing body. The problems of low assembly efficiency, high labor cost, poor appearance of the sealing body and poor electrical property caused by short glass tube assembly can be solved.)

1. A long glass tube press forming method for an initiating explosive device sealing body is characterized by comprising the following steps:

sieving the glass powder;

pressing and forming a glass tube blank: manufacturing a blank making mold, and pressing the sieved glass powder into a glass tube blank with a specified size by adopting the blank making mold;

and (3) performing row-bonding pre-burning on the glass tube blank to form a long glass tube which has certain mechanical strength and can be used for assembling the sealing body.

2. The press-molding method of a long glass tube for a sealing body of an initiating explosive device according to claim 1, wherein: the glass powder screening specifically comprises the step of screening the glass powder with the granularity of 40-70 meshes by adopting 40-mesh and 70-mesh samples.

3. The method for press forming the long glass tube for the sealing body of the initiating explosive device according to claim 2, wherein the step of sieving the glass powder specifically comprises the following steps:

firstly, screening glass powder by using a 40-mesh sample separation sieve, and selecting 40-mesh undersize;

and then, further screening the undersize product of 40 meshes by using a 70-mesh sample separation sieve, and selecting the oversize product of the 70-mesh sample separation sieve, namely the glass powder with the granularity of 40-70 meshes.

4. The press-forming method of a long glass tube for an initiating explosive device sealing body according to claim 1, wherein the press-forming of the glass tube blank comprises the following steps:

step (1), preparing glass powder and a blank making mold; the blank making mold comprises an upper mold, a middle mold, a lower mold and a core mold;

fixing a lower die on a lower die base, sleeving a long pore of a core die on the lower die and fixing the long pore of the core die on a vibration base, wherein the core die can vibrate up and down along with the vibration base;

step (3), the middle mold is installed and fixed on the middle mold base, the lower mold and the core mold are sleeved on the middle hole of the middle mold, the end surface of the core mold is flush with the end surface of the middle mold, the tail end of a material conveying pipe of the charging bucket is flatly paved on the middle mold and the middle mold base, and glass powder naturally falls through the material conveying pipe and flows into a gap between the middle mold and the core mold when a glass blank is pressed;

step (4), fixing the upper die in the upper die base;

step (5), starting a blank making machine, adjusting pressure according to the length of a glass tube to be pressed, enabling an upper die to move downwards to be matched with a lower die to apply pressure to glass powder and maintain the pressure for a certain time, enabling the upper die to move upwards after the pressure is maintained, enabling a material conveying pipe and a core die to move downwards along with a middle die and a middle die base synchronously, enabling the tail end of the material conveying pipe to move forwards along the end face of the middle die to eject a glass tube blank which is subjected to press forming after the material conveying pipe and the core die move downwards to the distance of the length of the glass tube to be pressed, and adjusting the length of the glass tube blank to be pressed by controlling the distance of the middle die moving downwards to realize long glass tube pressing;

and (6) after the glass tube blank is ejected, the material conveying pipe and the core mold synchronously move upwards along with the middle mold to reset, the tail end of the material conveying pipe moves backwards along the end face of the middle mold, so that the glass powder flows into the gap between the middle mold and the core mold, the steps (5) to (6) are repeated, and the next glass tube is pressed continuously.

5. The press forming method for the long glass tube for the initiating explosive device sealing body according to claim 1, wherein the step of performing the row-bonding pre-sintering on the glass tube blank comprises the following steps:

step (1), starting a viscosity-discharging pre-burning furnace, setting the temperature T to be 500 ℃, and starting to heat;

step (2), the glass tube blank is tiled in a stainless steel container, when the temperature is slowly raised from room temperature and stabilized to 500 ℃, the glass tube blank and the stainless steel container are placed in the middle of a hearth, timing is started at the same time, and after the heat preservation time reaches the set time for 40 minutes, the container is taken out of the hearth;

step (3), continuing to set the temperature T of the furnace to 700 ℃, and starting to heat up;

step (4), when the temperature rises to 700 ℃ and is stable, putting the glass tube blank subjected to the row of adhesion together with a container into the middle of a hearth, starting timing at the same time, and taking out the container from the hearth after the heat preservation time reaches the set time for 10-15 minutes;

and (5) after the glass tube is naturally cooled to room temperature, taking down the glass tube for processing the initiating explosive device glass sealing body.

6. The press-molding method of a long glass tube for a sealing body of an initiating explosive device according to claim 4, wherein: in the process of pressing and forming the glass tube blank, the inner diameter of the glass tube is determined by the size of a core die, the wall thickness of the glass tube is determined by the gap between the core die and a middle die, the length of the glass tube is determined by the downward movement displacement of the middle die and a middle die holder, and the size of the glass tube is finally determined.

7. The press-molding method of a long glass tube for a sealing body of an initiating explosive device according to claim 1, wherein: when the iron-sealed glass powder is subjected to row-bonding pre-sintering, the temperature of the glass tube blank and the stainless steel container is increased to 150 ℃ along with the furnace, the temperature is maintained for 20min, then the temperature is increased to 600 ℃ along with the furnace, the temperature is maintained for 40min, the stainless steel container is taken out, and the pre-sintering is carried out at 700 ℃ for 10-15 min.

Technical Field

The invention relates to a method for pressing and molding a long glass tube for an initiating explosive device sealing body.

Background

The glass tube is a key component of the initiating explosive device glass sealing body, and the polar needle and the shell are sintered into a whole through the solidification effect of glass in the high-temperature sintering process, so that the glass sealing body has good sealing performance; meanwhile, the insulation between the shell and the pole needle is realized by means of the insulation effect of the glass material.

Related patent documents or literature reports on press forming of a glass tube for a sealing body are few, the traditional forming mode of the glass tube for the sealing body is to granulate glass powder and then press the granulated glass powder into a short glass tube blank (the length is less than or equal to 3mm), or press the glass tube into a plate shape, and then machine the glass tube into a glass tube with a specified size through mechanical means such as drilling, cutting and the like, because the toughness and the brittleness of the glass tube are low, the defects of fracturing, block missing and the like easily occur when the glass tube is processed through the mechanical means, meanwhile, if the sealing hole of the glass sealing body is longer, a plurality of short glass tubes are needed to be assembled, and air overflows among the glass tubes in the high-temperature sintering process, so that the quality of the finished glass sealing body is poor. To solve the problem, CN202011409415.6 discloses a process for drawing molten glass into a glass tube through a mold, which mainly comprises the steps of preparing raw materials, heating and melting to obtain molten glass, cooling, naturally dropping the molten glass through the mold to form the glass tube, cutting the preliminarily hardened glass tube into glass tubes with equal length, annealing to obtain the finished glass tube, and the like, thereby realizing the preparation of the glass tube with any length. However, the process mainly has the following problems:

(1) the process is mainly used for preparing the high borosilicate glass tube. The glass tube for the initiating explosive device sealing body is made of electric vacuum glass or iron-sealed glass powder which is softened and has low strain temperature, the cooling and solidification process of molten glass is fast, the fluidity is difficult to control, the mold filling process is influenced, and the molten glass is insufficiently and uncontrollably formed in a mold, and the defects of block shortage, material shortage and the like are easily formed.

(2) The process has difficulty in ensuring the size specification of the glass tube. The glass melt is naturally dropped through a mould to form a glass tube, gas is introduced into the center of the mould during tube making, and the initially hardened glass tube is cut into glass tubes with equal length in the vertical dropping process. The inner diameter and the outer diameter of the glass tube for the initiating explosive device sealing body are respectively phi 1 and phi 2.1, the inner hole is small, the wall of the glass tube is thin, the uniformity of the inner diameter and the outer diameter of the glass tube and the wall thickness is difficult to ensure by the ventilation mode, and meanwhile, the glass tube for the initiating explosive device sealing body is low in toughness and large in brittleness, and the quality of the end face of the glass tube is difficult to ensure by adopting a mechanical cutting mode.

(3) The process flow is long, the efficiency is low, the production arrangement of the initiating explosive device sealing body has the characteristics of small batch, multiple batches and variable varieties, the processes of heating and melting, cooling and blank making, cutting, annealing and the like are repeatedly carried out when the method is adopted for blank making, the process production flow is long, the efficiency is low, and the production requirement of the initiating explosive device cannot be met.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the forming method of the long glass tube for the sealing body of the initiating explosive device is provided, the problems that a block is lacking inside the glass tube and the material is insufficient and the size is difficult to guarantee are solved, meanwhile, the problems of low production efficiency and poor finished product quality caused by assembling of a short glass tube are solved by adopting the long glass tube, and the technical problem of poor sealing performance and poor insulating performance of the sealing body caused by poor quality of the glass tube is further solved.

The technical solution of the invention is as follows: a long glass tube pressing and forming method for an initiating explosive device sealing body comprises the following steps:

sieving the glass powder;

pressing and forming a glass tube blank: manufacturing a blank making mold, and pressing the sieved glass powder into a glass tube blank with a specified size by adopting the blank making mold;

and (3) performing row-bonding pre-burning on the glass tube blank to form a long glass tube which has certain mechanical strength and can be used for assembling the sealing body.

Further, the glass powder screening specifically comprises the step of screening the glass powder with the granularity of 40-70 meshes by adopting 40-mesh and 70-mesh samples.

Further, the glass powder sieving specifically comprises the following steps:

firstly, screening glass powder by using a 40-mesh sample separation sieve, and selecting 40-mesh undersize;

and then, further screening the undersize product of 40 meshes by using a 70-mesh sample separation sieve, and selecting the oversize product of the 70-mesh sample separation sieve, namely the glass powder with the granularity of 40-70 meshes.

Further, the glass tube blank press forming comprises the following steps:

step (1), preparing glass powder and a blank making mold; the blank making mold comprises an upper mold, a middle mold, a lower mold and a core mold;

fixing a lower die on a lower die base, sleeving a long pore of a core die on the lower die and fixing the long pore of the core die on a vibration base, wherein the core die can vibrate up and down along with the vibration base;

step (3), the middle mold is installed and fixed on the middle mold base, the lower mold and the core mold are sleeved on the middle hole of the middle mold, the end surface of the core mold is flush with the end surface of the middle mold, the tail end of a material conveying pipe of the charging bucket is flatly paved on the middle mold and the middle mold base, and glass powder naturally falls through the material conveying pipe and flows into a gap between the middle mold and the core mold when a glass blank is pressed;

step (4), fixing the upper die in the upper die base;

step (5), starting a blank making machine, adjusting pressure according to the length of a glass tube to be pressed, enabling an upper die to move downwards to be matched with a lower die to apply pressure to glass powder and maintain the pressure for a certain time, enabling the upper die to move upwards after the pressure is maintained, enabling a material conveying pipe and a core die to move downwards along with a middle die and a middle die base synchronously, enabling the tail end of the material conveying pipe to move forwards along the end face of the middle die to eject a glass tube blank which is subjected to press forming after the material conveying pipe and the core die move downwards to the distance of the length of the glass tube to be pressed, and adjusting the length of the glass tube blank to be pressed by controlling the distance of the middle die moving downwards to realize long glass tube pressing;

and (6) after the glass tube blank is ejected, the material conveying pipe and the core mold synchronously move upwards along with the middle mold to reset, the tail end of the material conveying pipe moves backwards along the end face of the middle mold, so that the glass powder flows into the gap between the middle mold and the core mold, the steps (5) to (6) are repeated, and the next glass tube is pressed continuously.

Further, the step of pre-burning the glass tube blank in a row-bonding mode comprises the following steps:

step (1), starting a viscosity-discharging pre-burning furnace, setting the temperature T to be 500 ℃, and starting to heat;

step (2), the glass tube blank is tiled in a stainless steel container, when the temperature is slowly raised from room temperature and stabilized to 500 ℃, the glass tube blank and the stainless steel container are placed in the middle of a hearth, timing is started at the same time, and after the heat preservation time reaches the set time for 40 minutes, the container is taken out of the hearth;

step (3), continuing to set the temperature T of the furnace to 700 ℃, and starting to heat up;

step (4), when the temperature rises to 700 ℃ and is stable, putting the glass tube blank subjected to the row of adhesion together with a container into the middle of a hearth, starting timing at the same time, and taking out the container from the hearth after the heat preservation time reaches the set time for 10-15 minutes;

and (5) after the glass tube is naturally cooled to room temperature, taking down the glass tube for processing the initiating explosive device glass sealing body.

Further, in the process of pressing and forming the glass tube blank, the inner diameter of the glass tube is determined by the size of the core die, the wall thickness of the glass tube is determined by the gap between the core die and the middle die, the length of the glass tube is determined by the downward movement of the middle die and the middle die holder, and the size of the glass tube is finally determined.

Further, when the iron-sealed glass powder is subjected to row-bonding pre-sintering, the glass tube blank and the stainless steel container are heated to 150 ℃ along with the furnace, the temperature is kept for 20min, then the temperature is continuously heated to 600 ℃ along with the furnace, the temperature is kept for 40min, the stainless steel container is taken out, and pre-sintering is carried out at 700 ℃ for 10-15 min.

Compared with the prior art, the invention has the advantages that:

(1) the glass powder raw material is directly pressed, and a mold is not required to be used for blank making after glass is melted, so that the problems of internal block and material shortage of the glass tube caused by softening of the glass powder raw material of the initiating explosive device sealing body, low strain temperature, high cooling solidification speed and difficult mold filling are solved, and the consistency of the density of the pressed glass tube is improved;

(2) the glass tube blank with the specified specification is directly pressed in the pressing process, so that the problems of complex process flow and poor processing quality of the end surface of the glass tube caused by processing the glass tube in a mechanical mode are avoided, and the appearance and the size of the glass tube are easier to control;

(3) the length of the pressed glass tube blank is adjustable, the length of the pressed glass tube is indirectly adjusted by controlling the distance of the middle die moving downwards, a long glass tube (more than 6mm) can be pressed, the influence on the quality of a sealing body due to the splicing of short glass is avoided, and meanwhile, the assembly efficiency is improved and the production cost is reduced due to the adoption of long glass;

(4) the process is flexible, the flow is simple, the method is suitable for the characteristics of small-batch and multi-batch production of the initiating explosive device sealing bodies, the specification of the pressed glass blanks can be flexibly adjusted according to the specification of the sealing holes of the sealing bodies to be processed, and the corresponding quantity can be quickly pressed according to the quantity of the sealing bodies to be processed.

Drawings

FIG. 1 is a process flow chart of a method for forming a sealing body of an initiating explosive device by pressing a long glass tube;

FIG. 2 is a diagram of the structure of the priming sytem matching glass sealing body;

FIG. 3 is a schematic diagram of a non-matching glass sealing structure of initiating explosive device;

FIG. 4 is a view of a middle mold;

FIG. 5 is a view showing the structure of the upper mold;

FIG. 6 is a lower die structure view;

fig. 7 is a core mold structural view;

fig. 8 is a schematic view of a blank mold assembly.

Detailed Description

In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.

The method for forming the long glass tube for the initiating explosive device sealing body by pressing is further described in detail with reference to the drawings in the specification, and specific implementation manners may include (as shown in fig. 1 to 8): sieving glass powder, pressing and forming, and pre-sintering glass tube blanks in a row-bonding mode.

Further, the glass powder is sieved by adopting 40-mesh and 70-mesh sample sieving to obtain the glass powder with the granularity of 40-70 meshes, and the glass powder with the granularity has good fluidity and can ensure the density of a pressed glass blank;

in a possible implementation manner, the press forming step adopts a blank making mold to press the sieved glass powder into a glass tube blank with a specified size, the blank making mold comprises an upper mold, a middle mold, a lower mold and a core mold, and the press forming method specifically comprises the following steps:

(1) fixing a lower die on a lower die base, sleeving a long pore of a core die on the lower die and fixing the long pore of the core die on a vibration base, wherein the core die can vibrate up and down along with the vibration base;

(2) the middle mold is installed and fixed on a middle mold base, the lower mold and the core mold are sleeved on a middle hole of the middle mold, the end surface of the core mold is flush with the end surface of the middle mold, the tail end of a material conveying pipe of a charging bucket is flatly paved on the middle mold and the middle mold base, and glass powder naturally falls into a gap between the middle mold and the core mold through the material conveying pipe when a glass blank is pressed;

(3) fixing an upper die in an upper die base;

(4) and starting the blank making machine, enabling the upper die to move downwards to be matched with the lower die to apply pressure to the glass powder and maintain the pressure for a certain time, enabling the upper die to move upwards after the pressure is maintained, enabling the material conveying pipe and the core die to move downwards synchronously along with the middle die and the middle die base, enabling the tail end of the material conveying pipe to move forwards along the end face of the middle die to eject the glass tube blank which is subjected to compression molding after the material conveying pipe and the core die move to a specified distance, and adjusting the length of the glass tube blank to be compressed by controlling the distance of the middle die moving downwards to achieve the purpose of compressing the long glass tube.

(5) After the glass tube blank is ejected, the material conveying pipe and the core mold synchronously move upwards along with the middle mold to reset, the tail end of the material conveying pipe moves backwards along the end face of the middle mold, so that glass powder flows into the gap between the middle mold and the core mold, the glass tube is continuously pressed, and the whole process is automatic and high in efficiency.

In a possible implementation mode, in the pre-burning step of row-bonding of the glass tubes, the row-bonding temperature is 500 +/-20 ℃ and the time is more than or equal to 40 min; the pre-sintering temperature is 700 +/-20 ℃, and the time is 10-15 min.

In the scheme provided by the embodiment of the application, the method for pressing and forming the initiating explosive device sealing body by using the long glass tube mainly comprises the following steps: sieving glass powder, pressing and molding and pre-sintering glass tube blanks in a row-bonding mode. The glass powder is sieved by a 40-mesh and 70-mesh sample sieve, and is pressed into a glass tube blank by a blank making die and a powder forming machine in a pressing forming mode, and then the glass tube blank is subjected to row bonding and presintering. The invention focuses on the compression molding process, and other processes belong to conventional processes.

Example 1

Aiming at the preparation of the sealing body glass tube in the figure 2, the invention has the following implementation steps:

1. and selecting the glass powder with the granularity of 40-70 meshes by a sieving method. Firstly, screening glass powder by using a 40-mesh sample separation sieve, and selecting 40-mesh undersize; and then, further screening the 40-mesh undersize by using a 70-mesh sample separation sieve, and selecting the oversize of the 70-mesh sample separation sieve, namely glass powder with the granularity of 40-70 meshes, wherein the glass powder in the interval has good fluidity, so that the gap between the core mold and the middle mold can be fully filled in the natural falling process, and the compactness of a glass blank is ensured.

2. Pressing a glass tube blank by using a blank making mould, wherein the blank making process comprises the following steps:

(1) weighing glass powder, wherein if 1000 sealing bodies with the structure shown in FIG. 2 are produced, 400 g of sieved glass powder needs to be weighed, and the glass powder is poured into a charging bucket;

(2) installing a blank making mold, as shown in fig. 8, fixing a lower mold 86 on a lower mold base 84, sleeving a long pore of a core mold 81 on the lower mold 86 and fixing on a vibration base 82, wherein the core mold 81 can vibrate up and down along with the vibration base 82; the middle die 85 is installed and fixed on a middle die holder 87, the lower die 86 and the core die 81 are sleeved on a middle hole of the middle die 85, the end surface of the core die 81 is flush with the end surface of the middle die 85, the tail end of a material conveying pipe 89 of a charging bucket is tiled on the middle die 85 and the middle die holder 87, and glass powder naturally falls through the material conveying pipe 89 and flows into a gap between the middle die 85 and the core die 81 when a glass blank is pressed; securing an upper die 88 in an upper die holder 90;

(3) starting a blank making machine, adjusting the pressure of the blank making machine, wherein the length of a glass tube used by the sealing body of the structure shown in the figure 2 is 6 +/-0.1 mm, the blank making pressure is 2.33-2.37 TON, the upper die 88 moves downwards in the figure 8 to be matched with the lower die 86 to apply pressure to glass powder and maintain the pressure for a certain time, after the pressure is maintained for 2-3 s, the upper die 88 moves upwards, the material conveying pipe 89 and the core die 81 synchronously move downwards along the middle die 85 and the middle die base 87, after the material conveying pipe 89 moves to a specified distance of 6 +/-0.1 mm, the tail end of the material conveying pipe 89 moves forwards along the end surface of the middle die 85 to eject a pressed glass tube blank, and the length of the pressed glass tube blank can be adjusted by controlling the distance of the middle die 85 moving downwards, so that the long glass tube can be pressed.

(4) After the glass tube blank is ejected, the material conveying pipe 89 and the core mold 81 move upward and reset synchronously with the middle mold 85 in fig. 8, the tail end of the material conveying pipe 89 moves backward along the end surface of the middle mold 85, and simultaneously, the glass powder flows into the gap between the middle mold 85 and the core mold 81, the process is repeated, and the next glass tube is pressed continuously.

3. The glass tube blank row-bonding presintering process comprises the following steps

(1) Starting a viscosity-discharging pre-burning furnace, setting the temperature T to be 500 ℃, and starting to heat;

(2) the glass tube blank is flatly laid in a stainless steel container, when the temperature is slowly raised from room temperature and stabilized to 500 ℃, the glass tube blank and the stainless steel container are placed in the middle of a hearth, timing is started simultaneously, and after the heat preservation time reaches the set time of 40 minutes, the container is taken out of the hearth;

(3) continuing to set the temperature T of the furnace to 700 ℃ and starting to heat up;

(4) when the temperature rises to 700 ℃ and is stable, putting the glass tube blank subjected to the adhesive discharge together with the container into the middle of the hearth, simultaneously starting timing, and taking out the container from the hearth after the heat preservation time reaches the set time for 10-15 minutes;

(5) and after the glass tube is naturally cooled to the room temperature, taking down the glass tube for processing the initiating explosive device glass sealing body.

Example 2

Aiming at the preparation of the sealing body glass tube in the figure 3, the implementation steps of the invention are as follows:

1. glass powder is prepared. The glass powder raw material for the initiating explosive device non-matching glass sealing body is iron sealing glass powder which has good fluidity, can ensure that the clearance between the core mold 81 and the middle mold 85 in the figure 8 is filled in the natural falling process, and ensures the compactness of a glass blank, so the glass powder does not need to be sieved.

2. Pressing a glass tube blank by using a blank making mould, wherein the blank making process comprises the following steps:

(1) weighing glass powder, if 1000 pieces of the sealing body with the structure shown in FIG. 3 are produced, 200 g of glass powder needs to be weighed, and pouring the glass powder into a charging bucket 89;

(2) installing a blank making mold, as shown in fig. 8, fixing a lower mold 86 on a lower mold base 84, sleeving a long pore of a core mold 81 on the lower mold 86 and fixing on a vibration base 82, wherein the core mold 81 can vibrate up and down along with the vibration base 82; the middle die 85 is installed and fixed on a middle die holder 87, the lower die 86 and the core die 81 are sleeved on a middle hole of the middle die 85, the end surface of the core die 81 is flush with the end surface of the middle die 85, the tail end of a material conveying pipe 89 of a charging bucket is tiled on the middle die 85 and the middle die holder 87, and glass powder naturally falls through the material conveying pipe 89 and flows into a gap between the middle die 85 and the core die 81 when a glass blank is pressed; securing an upper die 88 in an upper die holder 90;

(3) starting a blank making machine, adjusting the pressure of the blank making machine, wherein the length of a glass tube used by the sealing body of the structure shown in fig. 3 is 5.6 +/-0.1 mm, the blank making pressure is 2.03-2.35 TON, the upper die 88 moves downwards in fig. 8 to be matched with the lower die 86 to apply pressure to glass powder and maintain the pressure for a certain time, after the pressure is maintained for 2-3 s, the upper die 88 moves upwards, the material conveying pipe 89 and the core die 81 move downwards along the middle die 85 and the middle die base 87 synchronously, after the glass tube moves to the specified distance of 5.6 +/-0.1 mm, the tail end of the material conveying pipe 89 moves forwards along the end face of the middle die 85 to eject the glass tube blank which is subjected to press forming, and the purpose of pressing the glass tube is realized by controlling the distance of the middle die 85 moving downwards to adjust the length of pressing the glass tube.

(4) After the glass tube blank is ejected, the material conveying pipe 89 and the core mold 81 move upward and reset synchronously with the middle mold 85 in fig. 8, the tail end of the material conveying pipe 89 moves backward along the end surface of the middle mold 85, and simultaneously, the glass powder flows into the gap between the middle mold 85 and the core mold 81, the process is repeated, and the next glass tube is pressed continuously.

3. The glass tube blank row-bonding presintering process comprises the following steps

(1) Starting a viscosity-discharging pre-burning furnace, and setting the temperature T to be 150 ℃;

(2) the glass tube blank is flatly laid in a stainless steel container, the glass tube blank and the stainless steel container are placed in the middle of a hearth, the temperature is raised to 150 ℃ along with a furnace, and the temperature is kept for 20 min;

(3) when the heat preservation time reaches a set value, setting the temperature of the furnace to 600 ℃, continuously heating the glass tube blank and the stainless steel container along with the furnace, heating the glass tube blank and the stainless steel container to 600 ℃ along with the furnace, and preserving the heat for 40 min; after the heat preservation time reaches a set value, taking out the container from the hearth;

(3) continuing to set the temperature T of the furnace to 700 ℃ and starting to heat up;

(4) when the temperature rises to 700 ℃ and is stable, putting the glass tube blank subjected to the adhesive discharge together with the container into the middle of the hearth, simultaneously starting timing, and taking out the container from the hearth after the heat preservation time reaches the set time for 10-15 minutes;

(5) and after the glass is naturally cooled to the room temperature, taking down the glass for processing the glass sealing body of the initiating explosive device.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.