A prefabricated fragment polyurethane adhesive sealing device and a prefabricated fragment manufacturing method

Abstract

The application discloses a prefabricated fragment polyurethane glue fixing and sealing device and a prefabricated fragment manufacturing method. The device is characterized in that a bottom cover is arranged on a fixing base, a mold core is arranged on the bottom cover, a mold core groove is arranged on the middle part of the mold core, an outer shell is arranged in the gap outside the mold core, an upper cover is arranged on the upper end of the outer shell, and a pressing block is connected to the lower end of a pressing rod penetrating through the upper part of the fixing base. The prefabricated fragment is manufactured through the steps of applying vaseline ointment, pasting cow leather paper, placing fragments, prefabricating fragments, removing the mold core and taking the prefabricated fragments. The prefabricated fragment has good anti-vibration effect, can achieve the effect of uniform scattering of the fragments during use, has high tool processing efficiency, simple manufacturing method and low processing cost, and has high reliability during use.

Description

TECHNICAL FIELD

[0001] The present application relates to preformed fragments, in particular to a polyurethane glue sealing device for preformed fragments, and a method for manufacturing preformed fragments using the device. BACKGROUND

[0002] The preformed fragments of the preformed fragment warhead are preprocessed into the required shape and size, and are adhered to the inner cavity of the warhead shell or the inner liner outside the charge by resin. After the explosion of the explosive, the preformed fragments are thrown out to drive the preformed fragments to fly at high speed to damage the target. The shape of the preformed fragments includes tile type, cube, sphere, and short rod. The preformed fragment warhead has the characteristics that the size and shape of the killing preformed fragments are regular, and the explosion energy of the explosive is not used to split the preformed fragments, the energy utilization rate is high, and the killing effect is good.

[0003] The processing and manufacturing of the preformed fragments are generally divided into two types: one is to process a network of grooves on the surface of the metal by mechanical processing, so as to facilitate the formation of the preformed fragments after the explosion. The other is to arrange the preformed fragments in order by using a mold, and to seal the preformed fragments by using epoxy resin or silicone glue to manufacture the preformed fragments. In the actual processing and use process, the above methods have the following disadvantages:

[0004] 1. The preformed fragments with network grooves are easily caused to be unevenly split, and the sizes are inconsistent when the preformed fragments are broken under stress, and the processing cost is high;

[0005] 2. The density of the epoxy resin glue or the silicone glue is 1.2 g / cm 3 Although the above methods can achieve the effect of uniform flying of the preformed fragments, the weight of the sealing glue directly affects the number of the preformed fragments due to the limitation of the weight of the preformed fragments. The heavier the sealing glue is, the fewer the number of the preformed fragments is;

[0006] 3. The preformed fragments manufactured by using the epoxy resin glue or the silicone glue need to be assisted by drying equipment for curing, otherwise the curing time is more than 24 hours in the natural state, and the preformed fragments are not easy to be demolded after curing, and the preformed fragments are easily damaged by forcibly demolding. SUMMARY

[0007] The technical problem to be solved by the present application is to provide a polyurethane glue sealing device for preformed fragments and a method for manufacturing preformed fragments by using the low density (0.3-0.8 g / cm 3 ) characteristics of the polyurethane glue. The number of the preformed fragments is increased under the limited weight requirement of the preformed fragments, the demolding of the preformed fragments is simple by using the sealing device, the density is controllable, and the requirements of good processability and low cost are met.

[0008] To solve the above technical problems, the technical scheme adopted by the present application is: a prefabricated fragment polyurethane glue sealing device, comprising a fixed seat, a bottom cover is arranged on the fixed seat, a mold core is arranged on the bottom cover, a mold core groove is arranged in the middle of the mold core, an outer shell is sleeved on the outside of the mold core, and an upper cover is arranged on the upper end of the outer shell; a pressing block or a fragment pressing block is connected to the lower end of the pressing rod passing through the upper part of the fixed seat.

[0009] The height of the outer shell is greater than the height of the mold core.

[0010] A mold core material returning seat and a prefabricated fragment material returning seat are further arranged on the fixed seat.

[0011] The present application uses the prefabricated fragment polyurethane glue sealing device to produce a prefabricated fragment, and the method comprises the following steps:

[0012] (1) Apply vaseline ointment: uniformly apply vaseline ointment to the outer wall of the mold core, the inner wall of the outer shell, the recesses of the upper cover and the bottom cover;

[0013] (2) Paste kraft paper: cut the kraft paper according to the size of the wall surface of the mold core outer wall and the outer shell inner wall surface, and paste them on the mold core outer wall surface and the outer shell inner wall surface respectively by means of vaseline ointment;

[0014] (3) Place fragments: install the mold core on the bottom cover, sleeve the outer shell on the mold core, and then orderly place the fragments in the gap between the outer shell and the mold core;

[0015] (4) Prefabricated fragment forming: mix polyurethane AB glue at a ratio of 1:1 and stir quickly, pour it into the mold core groove of the mold core before foaming, cover the upper cover, place it in the fixed seat, rotate the pressing rod downward until the pressing block presses the upper cover tightly, the polyurethane glue reacts and expands in the mold core groove of the mold core, flows into the gap between the outer shell and the mold core along the gap between the upper end of the mold core and the upper cover, and forms a prefabricated fragment after the polyurethane glue is solidified;

[0016] (5) Remove the mold core: remove the upper cover and the bottom cover, place the mold core, the fragments and the outer shell sealed together on the mold core material returning seat and fix them in the fixed seat, rotate the pressing rod to push the mold core out of the prefabricated fragment;

[0017] (6) Take the prefabricated fragment: place the prefabricated fragment and the outer shell taken out of the mold core on the prefabricated fragment material returning seat and fix them in the fixed seat, rotate the pressing rod to push the prefabricated fragment out of the outer shell, and the prefabricated fragment production is completed.

[0018] In step (2), the thickness of the kraft paper is 0.2 mm.

[0019] In step (4), the polyurethane glue solidification time is 30 min.

[0020] The polyurethane glue solid sealing device for prefabricated fragments and the prefabricated fragment manufacturing method designed by the technical scheme have the following beneficial effects:

[0021] 1. The prefabricated fragments sealed by the polyurethane glue have hollow bubbles in the structure, have good anti-vibration effect, and can achieve the effect of uniform scattering of the fragments during use;

[0022] 2. The solid sealing tool has high processing efficiency, especially in scientific research tests, and has low processing cost and flexible structure change;

[0023] 3. Under the condition of the same structure and quality requirement, the density of the polyurethane glue is controlled, and the remaining weight is distributed to the fragments, so that the number of fragments is effectively increased. For example, in the same volume of a cylinder with a diameter of 40 mm and a height of 40 mm, the mass of the silica gel material is 60.3 g (density: 1.2 g / cm 3 ), the mass of the polyurethane glue material is 40.2 g when the density of the polyurethane glue material is 0.8 g / cm 3 , and the difference between the two is 20.1 g. Assuming that the fragment is a steel ball with a diameter of 4 mm (0.26 g per ball), 77 fragments can be added to the weight of 20.1 g;

[0024] 4. The prefabricated fragments manufactured by the present application can be stored for up to 10 years indoors;

[0025] 5. The manufacturing method has simple process and low processing cost, and has high reliability during use. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Fig. 1 shows the structure of the polyurethane glue solid sealing device for prefabricated fragments;

[0027] Figure 2 Fig. 2 shows the schematic diagram of the mold core material removal;

[0028] Figure 3 Fig. 3 shows the schematic diagram of the prefabricated fragment material removal;

[0029] Figure 4 Fig. 4 shows the schematic diagram of the prefabricated fragment workpiece manufactured by the present application.

[0030] In the figure: 1-pressing rod, 2-fixing seat, 3-pressing block, 4-upper cover, 5-mold core groove, 6-leather paper, 7-mold core, 8-fragment, 9-outer shell, 10-bottom cover, 11-mold core material removal seat, 12-fragment pressing block, 13-prefabricated fragment material removal seat. DETAILED DESCRIPTION

[0031] The following is a detailed description of a polyurethane adhesive sealing device for prefabricated fragments and a method for manufacturing prefabricated fragments according to the present invention, with reference to the accompanying drawings.

[0032] The present invention is a polyurethane adhesive sealing device for prefabricated fragments, see Figures 1 to 3 , including a fixed seat 2, a bottom cover 10 is provided on the fixed seat 2, a core 7 is provided on the circular groove of the bottom cover 10, a core groove 5 is provided in the middle of the upper part of the core 7, an outer shell 9 is provided on the outside of the core 7, the height of the outer shell 9 should be greater than the height of the core 7, and an upper cover 4 is provided on the upper end of the outer shell 9, and the upper cover 4 can be covered on the upper cover 4. The lower end of the pressure rod 1 passing through the upper part of the fixed seat 2 is connected to a pressure block 3 or a fragment pressure block 12, and the pressure rod 1 is threadedly connected to the fixed seat 2. The present invention is also provided with a core ejection seat 11 and a prefabricated fragment ejection seat 13, and the core ejection seat 11 and the prefabricated fragment ejection seat 13 are both hollow cylinders, and the upper end of the cylinder is annularly concave. The present invention is connected to a pressure block 3 or a fragment pressure block 12 at the lower end of the pressure rod 1, and the radius of the fragment pressure block 12 is larger than the radius of the pressure block 3. When the lower end of the pressure rod 1 is replaced with the pressure block 3, the pressure block 3 is not only used to compress the upper cover 4, but also used to push the mold core 7 out of the prefabricated fragment. When the lower end of the pressure rod 1 is replaced with the fragment pressure block 12, the fragment pressure block 12 is used to push the prefabricated fragment out of the shell 9.

[0033] The present invention utilizes the polyurethane adhesive sealing device of the prefabricated fragment to make the prefabricated fragment, see Figures 1 to 4 , including the following steps:

[0034] (1) Apply vaseline ointment: Apply vaseline ointment evenly to the outer wall of the mold core 7, the inner wall of the shell 9, the upper cover 4 and the grooves of the bottom cover 10;

[0035] (2) Paste kraft paper: cut the corresponding kraft paper 6 according to the size of the outer wall of the core 7 and the inner wall of the shell 9. The thickness of the kraft paper 6 is 0.2 mm. Use vaseline ointment to stick them on the outer wall of the core 7 and the inner wall of the shell 9 respectively.

[0036] (3) Place the fragments: Install the core 7 on the bottom cover 10, put the shell 9 on the core 7, and then place the fragments 8 in the gap between the shell 9 and the core 7 in an orderly manner;

[0037] (4). Prefabricated fragment forming: Take polyurethane AB glue mixed according to 1:1, and quickly stir evenly, pour into the mold core groove 5 of the mold core 7 before foaming. Cover the upper cover 4, place it in the fixed seat 2, rotate the pressure rod 1 downward until the pressure block 3 presses the upper cover 4 tightly; the polyurethane glue reacts and expands in the mold core groove 5 of the mold core 7, flows into the gap between the shell 9 and the mold core 7 along the gap between the upper end of the mold core 7 and the upper cover 4, and forms a prefabricated fragment after the polyurethane glue is cured for about 30 minutes (polyurethane AB glue is similar to the couple). AB glue is the alias of two-liquid mixed hardening glue. One liquid is this glue, and the other liquid is hardening agent. The two liquids must be mixed to harden. It is a room temperature hardening glue, so it is a room temperature hardening glue. It is commonly used in industry. AB glue is the name of two-component adhesive, and there are AB glues of acrylic, epoxy, polyurethane and other components on the market);

[0038] (5). Remove the mold core: remove the upper cover 4 and the bottom cover 10, and place the mold core 7, the fragment 8 and the shell 9 fixed together on the mold core material removal seat 11, and fix them in the fixed seat 2; rotate the pressure rod 1, so that the pressure block 3 pushes the mold core 7 out of the prefabricated fragment;

[0039] (6). Take the prefabricated fragment: place the prefabricated fragment and the shell 9 removed from the mold core 7 on the prefabricated fragment material removal seat 13, and fix them in the fixed seat, rotate the pressure rod 1, so that the fragment pressure block 12 pushes the prefabricated fragment out of the shell 9, that is, the prefabricated fragment is completed.

Claims

1. A method for making prefabricated fragments by using a polyurethane adhesive sealing device for prefabricated fragments, characterized in that The polyurethane glue solid sealing device of the prefabricated fragment includes a fixing seat, characterized in that a bottom cover is arranged on the fixing seat, a mold core is arranged on the bottom cover, a mold core groove is arranged in the middle of the mold core, an outer shell is sleeved on the outside of the mold core, and an upper cover is arranged on the upper end of the outer shell; a pressing block or a fragment pressing block is connected to the lower end of the pressing rod passing through the upper part of the fixing seat, the height of the outer shell is greater than the height of the mold core, a mold core material withdrawing seat and a prefabricated fragment material withdrawing seat are further arranged on the fixing seat; The prefabricated fragment manufacturing method includes the following steps: (1) Apply vaseline ointment: uniformly apply vaseline ointment on the outer wall of the mold core, the inner wall of the outer shell, the recesses of the upper cover and the bottom cover; (2) Paste kraft paper: cut the kraft paper according to the size of the outer wall of the mold core and the inner wall of the outer shell, and paste the kraft paper on the outer wall of the mold core and the inner wall of the outer shell respectively by relying on the vaseline ointment; (3) Place fragments: install the mold core on the bottom cover, sleeve the outer shell on the mold core, and then orderly place the fragments in the gap between the outer shell and the mold core; (4) Prefabricated fragment forming: mix polyurethane AB glue at a ratio of 1:1 and stir quickly, pour the mixed polyurethane AB glue into the mold core groove of the mold core before foaming, cover the upper cover, place it in the fixing seat, rotate the pressing rod downward until the pressing block presses the upper cover tightly, the polyurethane glue reacts and expands in the mold core groove of the mold core, flows into the gap between the outer shell and the mold core along the gap between the upper end of the mold core and the upper cover, and forms a prefabricated fragment after the polyurethane glue solidifies; (5) Remove the mold core: remove the upper cover and the bottom cover, place the mold core, the fragments and the outer shell solidified together on the mold core material withdrawing seat and fix them in the fixing seat, rotate the pressing rod to push the mold core out of the prefabricated fragment; (6) Take the prefabricated fragment: place the prefabricated fragment and the outer shell taken out of the mold core on the prefabricated fragment material withdrawing seat and fix them in the fixing seat, rotate the pressing rod to push the prefabricated fragment out of the outer shell, and the prefabricated fragment manufacturing is completed.

2. A method of manufacturing a prefragmented polyurethane glue pot seal device according to claim 1, characterized in that In step (2), the thickness of the kraft paper is 0.2 mm.

3. A method of manufacturing a prefragmented polyurethane glue pot seal device according to claim 1, characterized in that In step (4), the curing time of the polyurethane glue is 30 minutes.

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