CN113788605B - Long glass tube compression molding method for initiating explosive device sealing body - Google Patents
Long glass tube compression molding method for initiating explosive device sealing body Download PDFInfo
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- CN113788605B CN113788605B CN202111006815.7A CN202111006815A CN113788605B CN 113788605 B CN113788605 B CN 113788605B CN 202111006815 A CN202111006815 A CN 202111006815A CN 113788605 B CN113788605 B CN 113788605B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B19/00—Other methods of shaping glass
- C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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Abstract
A long glass tube compression molding method for initiating explosive device sealing bodies comprises the following steps: sieving glass powder; pressing and forming a glass tube blank: manufacturing a blank making die, and pressing the screened glass powder into a glass tube blank with a specified size by adopting the blank making die; the glass tube blank is arranged, stuck and presintered to form a long glass tube with certain mechanical strength and capable of being used for assembling a sealing body. The problems of low assembly efficiency, high labor cost and poor appearance and electrical performance of the sealing body caused by assembling the short glass tube can be solved.
Description
Technical Field
The invention relates to a long glass tube compression molding method for a initiating explosive device sealing body.
Background
The glass tube is a key component of the initiating explosive device glass sealing body, and the electrode needle and the shell are sintered into a whole through the solidification of glass in the high-temperature sintering process, so that the glass sealing body has good sealing performance; meanwhile, insulation between the shell and the pole needle is realized by means of insulation effect of glass materials.
The related patent documents or literature reports about the press molding of glass tubes for sealing bodies are very few, the traditional sealing body glass tube molding mode is to granulate glass powder and then press the glass powder into short glass tube blanks (the length is less than or equal to 3 mm), or press the short glass tube blanks into plate-shaped glass tubes, then process the short glass tube blanks into the glass tubes with specified dimensions through mechanical means such as drilling and cutting, and the like. To solve this problem, CN202011409415.6 discloses a process for drawing molten glass out of a mold to obtain a glass tube, which mainly comprises the steps of preparing raw materials, heating and melting to obtain glass melt, cooling, naturally dropping the glass melt through the mold to obtain a glass tube, cutting the preliminarily hardened glass tube into glass tubes of equal length, annealing to obtain a glass tube finished product, and the like, so as to realize the preparation of glass tubes of any length. However, this process has the following problems:
(1) The process is mainly aimed at the preparation of high borosilicate glass tubes. The glass tube raw material for initiating explosive device sealing body is electric vacuum glass or iron sealing glass powder, the glass powder is softened and has low strain temperature, the temperature reduction and solidification process of the molten glass is fast, the fluidity is difficult to control, the mold filling process is influenced, and the defects of insufficient and uncontrolled molding of the molten glass in a mold, easy formation of block missing, material missing and the like are caused.
(2) The process is difficult to ensure the dimension 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 preliminarily hardened glass tube is cut into equal-length glass tubes in the vertical dropping process. The inner diameter and the outer diameter of the glass tube for the initiating explosive device sealing body are phi 1 and phi 2.1 respectively, the inner hole is small, the wall of the glass tube is thin, the ventilation mode is difficult to ensure the consistency of the inner diameter and the outer diameter of the glass tube and the wall thickness, and meanwhile, the glass tube of the initiating explosive device sealing body is low in toughness and large in brittleness, and the end face quality 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 initiating explosive device sealing body production arrangement has the characteristics of small batch, multiple batches and variety change, and the processes of heating, melting, cooling, blank making, cutting, annealing and the like are repeatedly carried out for blank making in the mode, so that the process flow is long, the efficiency is low, and the initiating explosive device sealing body production requirement cannot be met.
Disclosure of Invention
The invention solves the technical problems that: the method solves the problems of block and material shortage and difficult size guarantee in the glass tube, meanwhile, the long glass tube is adopted to avoid the problems of low production efficiency and poor quality of finished products caused by splicing of short glass tubes, and further solves the technical problems of poor sealing performance and insulating performance of the sealing body caused by poor quality of the glass tube.
The technical scheme of the invention is as follows: a long glass tube compression molding method for initiating explosive device sealing bodies comprises the following steps:
sieving glass powder;
pressing and forming a glass tube blank: manufacturing a blank making die, and pressing the screened glass powder into a glass tube blank with a specified size by adopting the blank making die;
and (3) performing row-bonding presintering on the glass tube blank to form a long glass tube with certain mechanical strength and capable of being used for assembling a sealing body.
Further, the glass powder sieving is specifically to adopt 40-mesh and 70-mesh sample sieving to obtain the glass powder with the granularity of 40-70 meshes.
Further, the glass powder sieving specifically comprises the following steps:
firstly, screening glass powder by a 40-mesh sample screening sieve, and selecting 40-mesh undersize products;
and then further screening the 40-mesh undersize by using a 70-mesh sample screening sieve, and selecting the oversize of the 70-mesh sample screening sieve, namely the glass powder with the granularity of 40-70 meshes.
Further, 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 die comprises an upper die, a middle die, a lower die and a core die;
step (2), fixing a lower die on a lower die holder, sleeving a core die long pore on the lower die and fixing the core die on a vibration seat, wherein the core die can vibrate up and down along with the vibration seat;
step (3), installing and fixing the middle die on a middle die holder, sleeving a lower die and a core die on a middle hole of the middle die, keeping the end face of the core die and the end face of the middle die to be level, spreading the tail ends of the conveying pipes of the charging barrel on the middle die and the middle die holder, and naturally dropping glass powder into a gap between the middle die and the core die through the conveying pipes when pressing a glass blank;
step (4), fixing the upper die in an upper die holder;
starting a blank making machine, regulating pressure according to the length of a glass tube to be pressed, enabling an upper die to move downwards, applying pressure to glass powder by matching with a lower die, maintaining pressure for a certain time, after the pressure maintaining is finished, enabling an upper die to move upwards, enabling a conveying pipe and a core die to move downwards along with a middle die and a middle die seat synchronously, enabling the tail end of the conveying pipe to move forwards along the end face of the middle die to eject the pressed and formed glass tube blank after the conveying pipe moves to the distance of the length of the glass tube to be pressed, and regulating the length of the pressed glass tube blank by controlling the distance of the downward movement of the middle die, so as to realize long glass tube pressing;
and (6) after the glass tube blank is ejected, synchronously moving the material conveying pipe and the core mold upwards along with the middle mold for resetting, moving the tail end of the material conveying pipe backwards along the end surface of the middle mold and enabling glass powder to flow into a gap between the middle mold and the core mold, and repeating the steps (5) to (6) to continuously press the next glass tube.
Further, the step of performing row-bonding presintering on the glass tube blank comprises the following steps:
step (1), starting a row of adhesive pre-sintering furnaces, setting the temperature T of the row of adhesive pre-sintering furnaces to be 500 ℃, and starting to heat;
step (2), the glass tube blank is paved 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 put into the middle of a hearth, timing is started, and after the heat preservation time reaches the set time of 40 minutes, the container is taken out of the hearth;
continuously setting the furnace temperature T to 700 ℃ and starting to heat;
step (4), when the temperature is raised to 700 ℃ and stabilized, placing the glass tube blank subjected to the adhesion discharge and the container in 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 of 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 press forming process of the glass tube blank, the inner diameter of the glass tube is determined by the size of the core mold, the wall thickness of the glass tube is determined by the clearance between the core mold and the middle mold, the length of the glass tube is determined by the downward movement displacement of the middle mold and the middle mold seat, and finally the size of the glass tube is determined.
Further, when the iron-seal glass powder is subjected to adhesion pre-sintering, the temperature of the glass tube blank and the stainless steel container is raised to 150 ℃ along with the furnace, the heat is preserved for 20min, then the temperature is continuously raised to 600 ℃ along with the furnace, the heat is preserved for 40min, the stainless steel container is taken out, and the pre-sintering is performed for 10-15 min at 700 ℃.
Compared with the prior art, the invention has the advantages that:
(1) The glass powder raw material is directly pressed, and a die is not required to be used for making blanks after glass is melted, so that the problems of block missing and material missing in the glass tube caused by difficult die filling due to the fact that the initiating explosive device sealing body glass powder raw material is softened, the strain temperature is low, the cooling solidification speed is high are avoided, 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 adopting a mechanical mode to process the glass tube 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 downward moving distance of the middle mould, long glass tubes (more than 6 mm) can be pressed, the quality of a sealing body is prevented from being influenced by splicing short glass, meanwhile, the assembly efficiency is improved by adopting long glass, and the production cost is reduced;
(4) The method has the characteristics of flexible process and simple flow, is suitable for small-batch and multi-batch production of initiating explosive device sealing bodies, can flexibly adjust the specifications of pressed glass blanks according to the specifications of sealing holes of the sealing bodies to be processed, and can rapidly press corresponding quantities according to the quantity of the sealing bodies to be processed.
Drawings
FIG. 1 is a process flow diagram of a method for press forming a long glass tube for initiating explosive device seals according to the present invention;
FIG. 2 is a diagram of a construction of an initiating explosive device matched glass seal;
FIG. 3 is a diagram of a construction of an initiating explosive device non-matching glass seal;
FIG. 4 is a diagram of a middle mold;
FIG. 5 is a diagram of the upper die structure;
FIG. 6 is a view showing the structure of the lower die;
FIG. 7 is a diagram of a core mold structure;
fig. 8 is a schematic diagram of the final assembly of the blank mold.
Detailed Description
In order to better understand the technical solutions described above, the following detailed description of the technical solutions of the present application is provided through the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limit the technical solutions of the present application, and the technical features of the embodiments and embodiments of the present application may be combined with each other without conflict.
The following describes in further detail the method for press forming a long glass tube for a initiating explosive device sealing body provided in the embodiments of the present application with reference to the accompanying drawings of the specification, and specific implementation manners may include (as shown in fig. 1 to 8): sieving glass powder, press forming, arranging and sticking the glass tube blank and presintering.
Further, the glass powder is screened by adopting 40-mesh and 70-mesh sample screening, and the glass powder with the granularity of 40-70 mesh is selected, so that the glass powder with the granularity has good fluidity and can ensure the density of pressed glass blanks;
in one possible implementation manner, the pressing and forming step uses a blank making mold to press the screened glass powder into a glass tube blank with a specified size, and the blank making mold comprises an upper mold, a middle mold, a lower mold and a core mold, and specifically comprises the following steps:
(1) The lower die is fixed on the lower die holder, the core die long pore is sleeved on the lower die and fixed on the vibration seat, and the core die can vibrate up and down along with the vibration seat;
(2) The middle die is installed and fixed on a middle die holder, the lower die and the core die are sleeved on a middle hole of the middle die, the end face of the core die is kept flush with the end face of the middle die, the tail end of a charging barrel conveying pipe is flatly paved on the middle die and the middle die holder, and glass powder naturally falls down into a gap between the middle die and the core die through the conveying pipe when a glass blank is pressed;
(3) Fixing an upper die in an upper die holder;
(4) Starting a blank making machine, wherein the upper die moves downwards to apply pressure to glass powder in cooperation with the lower die and maintain the pressure for a certain time, after the pressure maintaining is finished, the upper die moves upwards, the conveying pipe and the core die synchronously move downwards along with the middle die and the middle die seat, after the conveying pipe moves to a specified distance, the tail end of the conveying pipe moves forwards along the end face of the middle die to eject the pressed glass tube blank, and the length of the pressed glass tube blank is adjusted by controlling the downward moving distance of the middle die, so that the aim of pressing long glass tubes is fulfilled.
(5) After the glass tube blank is ejected, the material conveying pipe and the core mold synchronously move upwards to reset along with the middle mold, the tail end of the material conveying pipe moves backwards along the end face of the middle mold, glass powder flows into a 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 one possible implementation mode, in the glass tube row adhesion presintering step, the row adhesion temperature is 500+/-20 ℃ and the time is more than or equal to 40min; the presintering temperature is 700+/-20 ℃ and the presintering time is 10-15 min.
In the scheme provided by the embodiment of the application, the method for pressing and forming the long glass tube for the initiating explosive device sealing body mainly comprises the following steps: sieving glass powder, press forming and pre-sintering the glass tube blank. The glass powder is screened by a 40-mesh and 70-mesh sample screening, pressed into a glass tube blank by a blank making die and a powder forming machine, and then subjected to adhesion elimination and presintering. The invention focuses on the compression molding process, and other processes belong to the conventional processes.
Example 1
For the preparation of the sealing glass tube of fig. 2, the implementation steps of the invention are as follows:
1. and selecting glass powder with granularity of 40-70 meshes by a sieving method. Firstly, screening glass powder by a 40-mesh sample screening sieve, and selecting 40-mesh undersize products; and then further screening the 40-mesh undersize by using a 70-mesh sample screening sieve, and selecting the oversize of the 70-mesh sample screening sieve, namely, the glass powder with the granularity of 40-70 meshes, wherein the glass powder in the interval has good fluidity, can ensure that the gap between a core mold and a middle mold is filled in the natural falling process, and ensures the compactness of a glass blank.
2. The blank making process of pressing the glass tube blank by using the blank making die is as follows:
(1) Weighing glass powder, if 1000 parts of the sealing body with the structure shown in fig. 2 are produced, 400 g of the sieved glass powder is required to be weighed, and the glass powder is poured into a charging barrel;
(2) Mounting a blank making mold, as shown in fig. 8, fixing a lower mold 86 on a lower mold seat 84, sleeving a long pore of a core mold 81 on the lower mold 86 and fixing the core mold on a vibration seat 82, wherein the core mold 81 can vibrate up and down along with the vibration seat 82; the middle die 85 is installed and fixed on the 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 face of the core die 81 is kept flush with the end face of the middle die 85, the tail end of a charging barrel conveying pipe 89 is flatly paved on the middle die 85 and the middle die holder 87, and glass powder naturally falls into a gap between the middle die 85 and the core die 81 through the conveying pipe 89 when a glass blank is pressed; fixing the 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 for the sealing body with 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 to be matched with the lower die 86 to apply pressure to glass powder and keep the pressure for a certain time, after the pressure is kept for 2-3 seconds, the upper die 88 moves upwards, the material conveying pipe 89 and the core die 81 move downwards along with the middle die 85 and the middle die seat 87 synchronously, after the material conveying pipe 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 the pressed and formed glass tube blank, and the length of the pressed glass tube blank can be adjusted by controlling the downward moving distance of the middle die 85, so that the aim of pressing long glass tube is achieved.
(4) After the glass tube blank is ejected, the feed pipe 89 and the core mold 81 in fig. 8 synchronously move upwards along with the middle mold 85 for resetting, the tail end of the feed pipe 89 moves backwards along the end surface of the middle mold 85, glass powder flows into the gap between the middle mold 85 and the core mold 81, and the process is repeated to continuously press the next glass tube.
3. The process of arranging, sticking and presintering the glass tube blank is as follows
(1) Starting a row-sticking presintering furnace, setting the temperature T of the row-sticking presintering furnace to be 500 ℃, and starting to heat;
(2) The glass tube blank is paved 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 put into the middle of a hearth, timing is started, and after the heat preservation time reaches the set time of 40 minutes, the container is taken out from the hearth;
(3) Continuously setting the furnace temperature T to 700 ℃ and starting to rise the temperature;
(4) When the temperature is raised to 700 ℃ and stabilized, placing the glass tube blank subjected to the adhesion discharge and the container in 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 of 10-15 minutes;
(5) And after the glass tube is naturally cooled to room temperature, the glass tube is taken down for processing the initiating explosive device glass sealing body.
Example 2
For the preparation of the sealing glass tube of fig. 3, the implementation steps of the invention are as follows:
1. glass frit is prepared. The glass powder raw material for the non-matched glass sealing body of the initiating explosive device is iron sealing glass powder, and the glass powder has good fluidity, can ensure that the gap 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 the glass blank, so that the glass powder does not need to be screened.
2. The blank making process of pressing the glass tube blank by using the blank making die is as follows:
(1) Weighing 200 g of glass powder, and pouring the glass powder into a charging barrel 89 if 1000 parts of the sealing body with the structure shown in fig. 3 are produced;
(2) Mounting a blank making mold, as shown in fig. 8, fixing a lower mold 86 on a lower mold seat 84, sleeving a long pore of a core mold 81 on the lower mold 86 and fixing the core mold on a vibration seat 82, wherein the core mold 81 can vibrate up and down along with the vibration seat 82; the middle die 85 is installed and fixed on the 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 face of the core die 81 is kept flush with the end face of the middle die 85, the tail end of a charging barrel conveying pipe 89 is flatly paved on the middle die 85 and the middle die holder 87, and glass powder naturally falls into a gap between the middle die 85 and the core die 81 through the conveying pipe 89 when a glass blank is pressed; fixing the 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 for the sealing body with the structure shown in the figure 3 is 5.6+/-0.1 mm, the blank making pressure is 2.03-2.35 TON, the upper die 88 is moved downwards to be matched with the lower die 86 to apply pressure to glass powder and keep the pressure for a certain time, after the pressure is kept for 2-3 seconds, the upper die 88 is moved upwards, the material conveying pipe 89 and the core die 81 are moved downwards along with the middle die 85 and the middle die seat 87 synchronously, after the material conveying pipe is moved to a specified distance of 5.6+/-0.1 mm, the tail end of the material conveying pipe 89 is moved forwards along the end surface of the middle die 85 to eject the pressed glass tube blank, and the length of the pressed glass tube blank can be adjusted by controlling the downward moving distance of the middle die 85, so that the aim of pressing long glass tube is achieved.
(4) After the glass tube blank is ejected, the feed pipe 89 and the core mold 81 in fig. 8 synchronously move upwards along with the middle mold 85 for resetting, the tail end of the feed pipe 89 moves backwards along the end surface of the middle mold 85, glass powder flows into the gap between the middle mold 85 and the core mold 81, and the process is repeated to continuously press the next glass tube.
3. The process of arranging, sticking and presintering the glass tube blank is as follows
(1) Starting a row-sticking presintering furnace, and setting the temperature T of the row-sticking presintering furnace to 150 ℃;
(2) The glass tube blank is flatly paved in a stainless steel container, the glass tube blank and the stainless steel container are put into the middle of a hearth together, and the temperature is raised to 150 ℃ along with a furnace, and the heat is preserved for 20min;
(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 to 600 ℃ along with the furnace, and preserving heat for 40min; after the heat preservation time reaches a set value, taking out the container from the hearth;
(3) Continuously setting the furnace temperature T to 700 ℃ and starting to rise the temperature;
(4) When the temperature is raised to 700 ℃ and stabilized, placing the glass tube blank subjected to the adhesion discharge and the container in 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 of 10-15 minutes;
(5) And after the glass is naturally cooled to room temperature, taking down the glass for processing the initiating explosive device glass sealing body.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (3)
1. The long glass tube compression molding method for the initiating explosive device sealing body is characterized by comprising the following steps of:
sieving glass powder;
pressing and forming a glass tube blank: manufacturing a blank making die, and pressing the screened glass powder into a glass tube blank with a specified size by adopting the blank making die;
performing row-bonding presintering on the glass tube blank to form a long glass tube with certain mechanical strength and capable of being used for assembling a sealing body;
the glass powder sieving is specifically to adopt 40-70 mesh sample sieving to obtain glass powder with granularity between 40 and 70 mesh;
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 die comprises an upper die, a middle die, a lower die and a core die;
step (2), fixing a lower die on a lower die holder, sleeving a core die long pore on the lower die and fixing the core die on a vibration seat, wherein the core die can vibrate up and down along with the vibration seat;
step (3), installing and fixing the middle die on a middle die holder, sleeving a lower die and a core die on a middle hole of the middle die, keeping the end face of the core die and the end face of the middle die to be level, spreading the tail ends of the conveying pipes of the charging barrel on the middle die and the middle die holder, and naturally dropping glass powder into a gap between the middle die and the core die through the conveying pipes when pressing a glass blank;
step (4), fixing the upper die in an upper die holder;
starting a blank making machine, regulating pressure according to the length of a glass tube to be pressed, enabling an upper die to move downwards, applying pressure to glass powder by matching with a lower die, maintaining pressure for a certain time, after the pressure maintaining is finished, enabling an upper die to move upwards, enabling a conveying pipe and a core die to move downwards along with a middle die and a middle die seat synchronously, enabling the tail end of the conveying pipe to move forwards along the end face of the middle die to eject the pressed and formed glass tube blank after the conveying pipe moves to the distance of the length of the glass tube to be pressed, and regulating the length of the pressed glass tube blank by controlling the distance of the downward movement of the middle die, so as to realize long glass tube pressing;
after the glass tube blank is ejected, synchronously moving the material conveying pipe and the core mold upwards along with the middle mold for resetting, moving the tail end of the material conveying pipe backwards along the end surface of the middle mold and enabling glass powder to flow into a gap between the middle mold and the core mold, repeating the steps (5) to (6), and continuously pressing the next glass tube;
the step of pre-sintering the glass tube blank in a row-sticking way comprises the following steps:
step (1), starting a row of adhesive pre-sintering furnaces, setting the temperature T of the row of adhesive pre-sintering furnaces to be 500 ℃, and starting to heat;
step (2), the glass tube blank is paved 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 put into the middle of a hearth, timing is started, and after the heat preservation time reaches the set time of 40 minutes, the container is taken out of the hearth;
continuously setting the furnace temperature T to 700 ℃ and starting to heat;
step (4), when the temperature is raised to 700 ℃ and stabilized, placing the glass tube blank subjected to the adhesion discharge and the container in 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 of 10-15 minutes;
step (5), after the glass tube is naturally cooled to room temperature, the glass tube is taken down for processing the initiating explosive device glass sealing body;
in the press forming process of 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 clearance 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 seat, and finally the size of the glass tube is determined;
the blank making pressure is 2.03 to 2.35TON, and the pressure is maintained for 2 to 3 seconds.
2. The method for press forming a long glass tube for a sealing body of an initiating explosive device according to claim 1, wherein the sieving of the glass frit specifically comprises the following steps:
firstly, screening glass powder by a 40-mesh sample screening sieve, and selecting 40-mesh undersize products;
and then further screening the 40-mesh undersize by using a 70-mesh sample screening sieve, and selecting the oversize of the 70-mesh sample screening sieve, namely the glass powder with the granularity of 40-70 meshes.
3. The method for press molding a long glass tube for a sealed body of an initiating explosive device according to claim 1, wherein: when the iron-seal glass powder is subjected to discharging and sticking presintering, the temperature of the glass tube blank and the stainless steel container is raised to 150 ℃ along with the furnace, the heat is preserved for 20min, then the temperature is continuously raised to 600 ℃ along with the furnace, the heat is preserved for 40min, the stainless steel container is taken out, and presintering is performed for 10-15 min at 700 ℃.
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| JP3500987B2 (en) * | 1998-10-27 | 2004-02-23 | 松下電工株式会社 | Molding equipment for cylindrical molded products |
| CN112573831A (en) * | 2020-12-08 | 2021-03-30 | 赣州中瓷科技有限公司 | Glass bead for fixing filament of incandescent lamp and preparation process thereof |
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