Real-time temperature and pressure change detection device and method for press-fitting energetic material

Abstract

The invention discloses a real-time temperature and pressure change detection device and method for a press-fitting type energetic material, and relates to the technical field of press-fitting detection. Comprising an outer die sleeve and an inner die sleeve which are sleeved into a whole in the radial direction, an upper punch and a lower punch which are arranged on the upper portion and the lower portion of the inner side of the inner die sleeve respectively, a side face contact type temperature and pressure sensor arranged on the inner side of the inner die sleeve, and a temperature and pressure sensor arranged on the lower punch, the pressure testing device is characterized in that the outer die sleeve and the inner die sleeve are of a combined die sleeve structure in the radial direction, a granular mixture loading space is formed between the two-section inner die sleeve and the lower punch, and the side face contact type temperature and pressure sensor and the temperature and pressure sensor are disassembled and assembled on the outer die sleeve through the split type inner die sleeve. The pressure testing device has the technical advantages that the pressure testing device adopts a double-die-sleeve structure, and the outer die sleeve and the inner die sleeve adopt a combined die sleeve structure in the radial direction; the inner die sleeve is designed into a two-section symmetrical structure, so that the sensor can be conveniently placed and taken down; the square through groove is designed on the outer die sleeve, so that the end parts of the temperature and pressure sensor and the side contact type temperature and pressure sensor can be conveniently led out, and the press fitting and detection operation process is simpler.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pressing detection, in particular to a device and method for detecting real-time temperature and pressure changes of a pressing type energetic material. BACKGROUND

[0002] With the continuous progress and development of ammunition warheads, various new and complex geometric structure propellants emerge, and the propellant quality level will have higher requirements, which drives the pressing engineering basic application technology field research to have more needs, and the pressure and temperature distribution of the pressing part in the pressing process and the change rule with time are understood, so as to design a reasonable warhead charging structure and guide the design of the pressing die and the determination of the pressing method.

[0003] At present, the existing technology can only reflect the downward pressure on the propellant through the pressure of the pressing machine and reflect the temperature of the propellant through the heating die sleeve. There is no actual scheme to test the acting force and temperature of the bottom surface, wall surface and interior of the propellant. How to master the flowability rule of the granular body pressing becomes an important direction for the development of the pressing process technology field. How to provide a means for detecting the pressing force of the granular body according to the structure characteristics and test method of the real-time pressure change detection device of the pressing process becomes a technical problem that the technical personnel in the field urgently need to solve. SUMMARY

[0004] The device provides a device and method for detecting real-time temperature and pressure changes of a pressing type energetic material, so as to obtain the real-time pressure and temperature changes in the pressing process. The device improves the traditional pressing die from the perspective of test use, so as to obtain the real-time pressure and temperature distribution and change in the pressing process, and further research the pressing process technology method. The specific implementation manner is as follows: The device for detecting real-time temperature and pressure changes of a pressing type energetic material comprises: An outer die sleeve and an inner die sleeve are radially sleeved, and the inner die sleeve is arranged in a split type on the inner side of the outer die sleeve; An upper punch and a lower punch are respectively arranged on the upper side and the lower side of the inner side of the inner die sleeve, and a space for loading the granular body is formed between the two split inner die sleeves and the lower punch, and the upper punch is axially pressed on the granular body in the loading space; A side contact type temperature and pressure sensor is arranged on the inner side of the inner die sleeve, and a temperature and pressure sensor is arranged on the upper punch, and the side contact type temperature and pressure sensor and the temperature and pressure sensor are disassembled and assembled on the outer die sleeve through the split inner die sleeve.

[0005] Based on the above technical scheme, by selecting the radial fit of the inner and outer sleeves, the fit of the upper and lower punches and the inner sleeve, and the fit of the material return sleeve and the upper punch, a series of assembly problems caused by the improper fit of the mold are avoided. The device is designed using Creo three-dimensional modeling, and the finite element software Abques is used to ensure the reliability and safety of the real-time pressure-temperature change detection device for pressure assembly. Preferably, the device further comprises an ejection sleeve arranged on the upper punch and a material return sleeve arranged on the workbench of the oil press. The material return sleeve and the lower sleeve form a material return space. When the upper end surface of the material return sleeve contacts the upper plate of the external oil press, the ejection sleeve ejects the two halves of the inner sleeve from the outer sleeve into the inner hole of the material return sleeve to complete the material return. The granular body can be an inert granular body or a granular body containing energetic materials.

[0006] Based on the above technical scheme, the following special technical treatment is required for the sleeve parts: the material used should be a forged blank, and the carbonized carbide needs to be refined by punching. The heat treatment hardness of the mold should be controlled at HRC 58-62. The finishing process should avoid grinding burns. The mold should be subjected to non-destructive testing, and the upper and lower sleeves should not have cracks or other defects. If the mold working surface is plated with hard alloy, it should meet the requirements of WJ541-1988. Considering the radial expansion of the propellant grain, the design diameter of the mold can be reduced by the amount of expansion.

[0007] Preferably, the outer sleeve and the inner sleeve, the inner sleeve and the upper punch, and the inner sleeve and the lower punch are all gap-fitted.

[0008] Preferably, the inner side of the inner sleeve is formed with an axial punch cavity, and the side wall of the axial punch cavity is formed with an inner arc groove for installing a side contact type temperature and pressure sensor.

[0009] Preferably, the side of the outer sleeve and the side of the inner sleeve are respectively provided with a first square through groove and a second square through groove.

[0010] Based on the above technical scheme, the tolerance of the gap fit is H10 / d9, which can achieve positioning and reliable mold removal.

[0011] Preferably, the temperature and pressure sensor has two types of selection and arrangement methods: First, the lower punch is provided with a lateral through mounting groove at the top, and the temperature and pressure sensor is a horizontal contact type temperature and pressure sensor laid in the mounting groove, and the lead-out end passes through the first square through groove and the second square through groove.

[0012] Second, the lower punch is provided with a through long rectangular hole in the axial direction, and the temperature and pressure sensor is a vertical contact type temperature and pressure sensor, which passes through the long rectangular hole and the probe end extends into the top of the lower punch.

[0013] The method for detecting the real-time temperature and pressure changes of pressure-assembled type energetic materials comprises the following steps: Step 100, screen the bulk material with the pressure assembly condition to achieve the required particle size distribution, use the American 10 mesh sieve, and remove the particles with a size greater than 2.05 mm to improve the flowability of the bulk material; Step 200, to improve the compressibility of the test object, place the bulk material and the mold in the oven for oven holding to prepare for the pressure assembly work; Step 300, before the test, the temperature and pressure sensor and the side contact temperature and pressure sensor are respectively bonded to the grooves of the lower punch and the inner mold sleeve using adhesive, and the excess adhesive is cleaned, and the lead end of the sheet temperature and pressure sensor is passed through the outer mold sleeve and the inner mold sleeve; Step 400, place and align the outer mold sleeve, the inner mold sleeve and the lower punch on the oil press; Step 500, pour the bulk material into the inner mold sleeve in turn and spread it evenly, place the upper punch, rotate it appropriately and observe whether the test device is in the pressure center of the oil press, and then complete the preparation work of the test and pressure assembly operation; Step 600, according to the compressibility of the bulk material and the working speed of the pressure assembly, the pressure assembly operation is carried out; Step 700, after the pressure assembly reaches the designed density, the test and pressure assembly operation is completed; Step 800, place the material removal sleeve and the ejection sleeve to prepare for the mold removal operation of the oil press; Step 900, after the mold removal of the oil press is completed, use tools to pry open the two halves of the inner mold sleeve, and take out the temperature and pressure sensor and the side contact temperature and pressure sensor; Step 1000, clean the adhesive in the installation groove of the inner mold sleeve and the lower punch for the next work cycle.

[0014] In summary, the present application has the following beneficial technical effects: 1. The pressure test device of the present application adopts a double mold sleeve structure, the outer mold sleeve and the inner mold sleeve adopt a combined mold sleeve structure in the radial direction, and the inner mold sleeve is designed as a two-halves symmetrical structure to facilitate the placement and removal of the sensor; 2. The present application has a simple structure, a square through slot is designed on the outer mold sleeve, which facilitates the lead-out of the end of the temperature and pressure sensor and the side contact temperature and pressure sensor, and makes the pressure assembly and detection operation process simpler; 3. In the present application, a sheet-shaped high-precision contact temperature and pressure sensor is selected, which fully utilizes the flexibility of the sensor material and collects signals from the temperature and pressure sensor and the side contact temperature and pressure sensor. 4. In the present application, the inner and outer mold sleeves are placed on the same side and two square slots are respectively opened, to facilitate the lead-out of the temperature and pressure sensor and the side contact temperature and pressure sensor from the device. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1is the structural diagram of the present application Figure 1 ; Figure 2 is the structural diagram of the present application Figure 2 ; Figure 3 is the structural diagram of the present application Figure 4 is the structural diagram of the present application Figure 5 is the structural diagram of the present application Figure 6 is the structural diagram of the present application Figure 7 is the structural diagram of the present application Figure 8 is the structural diagram of the present application Figure 9 is the structural diagram of the present application Figure 1 ; Figure 10 is the structural diagram of the present application Figure 2 ; Figure 11 is the structural diagram of the present application Figure 12 is the structural diagram of the present application Figure 13 is the structural diagram of the present application Figure 14 is the structural diagram of the present application

[0016] Explanation of reference signs: 1, outer sleeve, 2, lower punch, 3, horizontal contact temperature and pressure sensor, 4, inner sleeve, 5, upper punch, 6, side contact temperature and pressure sensor, 7, vertical contact temperature and pressure sensor, 8, ejection sleeve, 9, material return sleeve, 10, propellant grain, 101, hot water tank, 102, first square through slot, 201, oblong hole, 202, mounting groove, 401, axial punch cavity, 402, second square through slot, 403, inner arc groove. DETAILED DESCRIPTION

[0017] The specific embodiment of the present application is described below in combination with the drawings and examples: It should be noted that the structure, proportion, size, etc. shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the present application. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose of the present application, should still fall within the scope of the disclosed technology.

[0018] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship is also considered as the implementation range of the present application without substantial change of the technical content.

[0019] The following will be described in detail in combination with the drawings Figures 1-14 The present application is further described in detail.

[0020] The present application discloses a device and method for detecting real-time temperature and pressure changes of press-packed energetic materials.

[0021] Embodiment 1 Referring to Figures 1 to 7 The present embodiment discloses a device for detecting real-time temperature and pressure changes of press-packed energetic materials, which comprises an outer sleeve 1 and an inner sleeve 4 radially sleeved together, an upper punch 5 and a lower punch 2 respectively arranged on the upper and lower sides of the inner sleeve 4, an ejection sleeve 8 arranged on the upper punch 5 and a material removal sleeve 9 arranged on the workbench surface of an oil press, and a side contact type temperature and pressure sensor 6 arranged on the inner side of the inner sleeve 4 and a temperature and pressure sensor arranged on the lower punch 2. In the structure, the inner sleeve 4 is arranged in a split type on the inner side of the outer sleeve 1, and the space for loading the granular body is formed between the two split inner sleeves 4 and the lower punch 2. The axial pressing action of the upper punch 5 is applied to the granular body in the loading space. The side contact type temperature and pressure sensor 6 and the temperature and pressure sensor complete the disassembly and assembly on the outer sleeve 1 through the split type inner sleeve 4.

[0022] The material removal sleeve 9 and the lower sleeve form a material removal space. After the upper end surface of the material removal sleeve 9 contacts the upper plate of the external oil press, the two split inner sleeves 4 are ejected from the outer sleeve 1 to the inner hole of the material removal sleeve 9 to complete the material removal.

[0023] The outer sleeve 1 and the inner sleeve 4, the inner sleeve 4 and the upper punch 5, and the inner sleeve 4 and the lower punch 2 are all gap fitted. The inner side of the inner sleeve 4 forms an axial punch cavity 401, the side wall of the axial punch cavity 401 forms an inner arc groove 403 for mounting the side contact type temperature and pressure sensor 6, and the side of the outer sleeve 1 and the side of the inner sleeve 4 are respectively provided with a first square through groove 102 and a second square through groove 402.

[0024] In combination with Figure 12, the red position in the side contact temperature and pressure sensor 6 is the temperature measuring point, and the background gray part is the pressure measuring point; the side contact temperature and pressure sensor 6 includes three groups of tap lines arranged side by side, each group of tap lines includes long, medium and short tap lines, and the end point positions of the tap lines are arranged with temperature measuring points; the side part of the side contact temperature and pressure sensor 6 is also integrated with a square pressure measuring point with a side length of 56mm, and the longitudinal spacing between the three temperature measuring points in the structure is 20.6mm, and the horizontal spacing between the adjacent groups of temperature measuring points is 20.6mm.

[0025] Example 2 Referring to Figures 8 to 10 and Figure 13 , based on example 1, this embodiment also discloses a real-time temperature and pressure change detection device for pressure-packed energetic materials, and the temperature and pressure sensor is a horizontal contact temperature and pressure sensor 3 laid in the mounting groove 202, the mounting groove 202 is provided in the top of the lower punch 2 in the structure, and the lead-out end of the horizontal contact temperature and pressure sensor 3 passes through the first square through groove 102 and the second square through groove 402 in turn.

[0026] In combination Figure 13 , the probe end of the horizontal contact temperature and pressure sensor 3 is laid flat, wherein the red position is the temperature measuring point, and the background gray part is the pressure measuring point; the horizontal contact temperature and pressure sensor 3 includes three groups of tap lines arranged side by side, each group of tap lines includes long, medium and short tap lines, and the end point positions of the tap lines are arranged with temperature measuring points; the side part of the horizontal contact temperature and pressure sensor 3 is also integrated with a square pressure measuring point with a side length of 44.7mm, and the longitudinal spacing between the three temperature measuring points in the structure is 16.3mm, and the horizontal spacing between the adjacent groups of temperature measuring points is 15.4mm.

[0027] Example 3 Referring to Figures 1 to 7 and Figure 14 , based on example 1, this embodiment also discloses a real-time temperature and pressure change detection device for pressure-packed energetic materials, and the temperature and pressure sensor is a vertical contact temperature and pressure sensor 7, the vertical contact temperature and pressure sensor 7 passes through the long hole 201 in the axial direction of the lower punch 2, and the probe end of the vertical contact temperature and pressure sensor 7 extends into the top of the lower punch 2, in order to facilitate wiring, the vertical contact temperature and pressure sensor 7 is in the shape of an L-shaped fold line as a whole, and it does not pass through the outer sleeve 1 and the inner sleeve 4.

[0028] In combination Figure 14, the probe end of the vertical contact type temperature and pressure sensor 7 is vertically placed, wherein the red position is the temperature measurement point, and the background gray part is the pressure measurement point; the vertical contact type temperature and pressure sensor 7 includes two groups of tap lines arranged side by side with lateral offset, each group of tap lines includes long and short tap lines, and the end point positions of each tap line are arranged with temperature measurement points; the vertical contact type temperature and pressure sensor 7 further integrally has a rectangular pressure measurement point with a length of 38mm and a width of 15.2mm, the longitudinal spacing between the long and short temperature measurement points in the structure is 17.9mm, the lateral spacing between adjacent long temperature measurement points of different groups is 8.4mm, and the longitudinal spacing between adjacent long temperature measurement points of different groups is 8.9mm.

[0029] Example 4 Referring to Figures 1 to 11 Based on the above embodiment, the embodiment further discloses a real-time temperature and pressure change detection method for press-packed energetic materials, and the method comprises the following steps: Step 100, screening the granular body with press-packed conditions to achieve the required particle size distribution, using a U.S. 10 mesh sieve to remove particles with a size greater than 2.05mm; to improve the flowability of the granular body; Step 200, placing the granular body and the mold in the oven for oven heat preservation; Step 300, before the test, the temperature and pressure sensor and the side contact type temperature and pressure sensor 6 are respectively bonded to the grooves of the lower punch 2 and the inner mold sleeve 4 using an adhesive, and the excess adhesive is cleaned, and the lead end of the sheet-shaped temperature and pressure sensor is passed through the outer mold sleeve 1 and the inner mold sleeve 4; Step 400, placing and adjusting the outer mold sleeve 1, the inner mold sleeve 4 and the lower punch 2 on the oil press; Step 500, pouring the granular body into the inner mold sleeve 4 in turn and spreading it evenly, placing the upper punch 5, appropriately rotating and observing whether the test device is in the pressure center of the oil press, and then completing the preparation work of the test and press packing operation; Step 600, according to the compressible ratio of the granular body and the working speed of the press packing, the press packing operation is carried out; Step 700, after the press-packed grain 10 reaches the designed density, the test and press packing operation is completed; Step 800, placing the material removal sleeve 9 and the ejection sleeve 8, the ejection sleeve 8 acting on the upper punch 5, preparing for the ejection operation of the oil press; Step 900, after the ejection of the oil press is completed, the two halves of the inner mold sleeve 4 are pried open using a tool, and the temperature and pressure sensor and the side contact type temperature and pressure sensor 6 are taken out; Step 1000, cleaning the adhesive in the installation groove 202 of the inner mold sleeve 4 and the lower punch 2, and entering the next work cycle.

[0030] Example 5 Referring to Figures 1 to 12, based on embodiment 1, the embodiment also discloses a real-time temperature and pressure change detection device for pressing type energetic materials, the inner side of the two-part inner mold sleeve 4 is provided with the two-part inner mold sleeve 4, but the arrangement direction of the side contact type temperature and pressure sensor 6 is opposite, and the side contact type temperature and pressure sensor 6 is arranged on both sides, so that the wall surface force and temperature during the whole pressing process can be tested.

[0031] Many other changes and modifications can be made without departing from the concept and scope of the application. It should be understood that the application is not limited to a particular embodiment, and the scope of the application is defined by the appended claims.

Claims

1. A device for real-time temperature and pressure change detection of press-fit energetic materials, characterized in that, include: An outer mold sleeve (1) and an inner mold sleeve (4) are radially fitted together, and the inner mold sleeve (4) is arranged in a segmented manner on the inner side of the outer mold sleeve (1); An upper punch (5) and a lower punch (2) are respectively provided on the upper and lower sides of the inner mold sleeve (4). The two halves of the inner mold sleeve (4) and the lower punch (2) form a space for loading granules. The upper punch (5) applies axial pressure to the granules in the space. A side-contact temperature and pressure sensor (6) is located inside the inner mold sleeve (4), and a temperature and pressure sensor is located on the lower punch (2). The side-contact temperature and pressure sensor (6) and the temperature and pressure sensor are assembled and disassembled on the outer mold sleeve (1) through the split inner mold sleeve (4).

2. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 1, characterized in that, It also includes an ejector sleeve (8) on the upper punch (5) and a material ejector sleeve (9) on the hydraulic press worktable. The material ejector sleeve (9) and the outer mold sleeve (1) form a material ejection space. After the upper end face of the material ejector sleeve (9) contacts the upper plate of the external hydraulic press, the ejector sleeve (8) pushes the two inner mold sleeves (4) out of the outer mold sleeve (1) into the inner hole of the material ejector sleeve (9) to complete the material ejection.

3. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 2, characterized in that, The outer mold sleeve (1) and the inner mold sleeve (4), the inner mold sleeve (4) and the upper punch (5), and the inner mold sleeve (4) and the lower punch (2) are all clearance fits.

4. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 3, characterized in that, An axial cavity (401) is formed on the inner side of the inner mold sleeve (4), and an inner arc groove (403) for mounting the side contact type temperature and pressure sensor (6) is formed on the side wall of the axial cavity (401).

5. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 4, characterized in that, The outer mold sleeve (1) side and the inner mold sleeve (4) side are respectively provided with a first square through groove (102) and a second square through groove (402).

6. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 5, characterized in that, The top of the lower punch (2) is provided with a laterally conductive mounting groove (202). The temperature and pressure sensor is a flat contact temperature and pressure sensor (3) laid flat in the mounting groove (202), and its lead-out end passes through the first square through groove (102) and the second square through groove (402) in sequence.

7. The device for real-time temperature and pressure change detection of press-fit energetic materials according to claim 5, characterized in that, The lower punch (2) has an axially connected rectangular hole (201). The temperature and pressure sensor is a vertical contact temperature and pressure sensor (7). The vertical contact temperature and pressure sensor (7) passes through the rectangular hole (201), and its probe end extends into the top of the lower punch (2).

8. A method for real-time temperature and pressure change detection of press-fit energetic materials, characterized in that, The method is based on the real-time temperature and pressure change detection device for press-fitted energetic materials as described in any one of claims 1 to 5, and the method includes the following steps: Step 100: Screen the granular materials that are ready for pressing to achieve the required particle size distribution. Use a US standard 10-mesh sieve to remove particles with a size ≥2.05mm. Step 200: Place the granules and the mold in an oven and keep the oven warm; Step 300: Before the press test, the temperature and pressure sensor and the side contact temperature and pressure sensor (6) are respectively glued to the grooves of the lower punch (2) and the inner mold sleeve (4) with adhesive. After cleaning up the excess glue, the lead end of the sheet temperature and pressure sensor is passed through the outer mold sleeve (1) and the inner mold sleeve (4). Step 400: Place and align the outer mold sleeve (1), the inner mold sleeve (4), and the lower punch (2) on the hydraulic press. Step 500: Pour granules into the inner mold sleeve (4) and spread them evenly. Place the upper punch (5) upright, rotate it appropriately, and observe whether the testing device is in the pressure center of the hydraulic press. Then complete the preparation work for testing and pressing. Step 600: Perform the pressing operation according to the compressibility ratio of the granules and the pressing feed speed; Step 700: After the press-fitting reaches the design density, the testing and press-fitting operations are completed. Step 800: Place the ejector sleeve (9) and the ejector sleeve (8) to prepare for the demolding operation of the hydraulic press; Step 900: After the hydraulic press demolding is completed, use a tool to pry open the two inner mold sleeves (4) and take out the temperature and pressure sensor and the side contact temperature and pressure sensor (6). Step 1000: Clean the adhesive in the mounting groove (202) of the inner mold sleeve (4) and the lower punch (2) and enter the next working cycle.

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