Preparation group mold and preparation method of tinfoil cover plate for initiating explosive device

Abstract

The invention relates to a group mold for preparing a tin foil cover plate for an initiating explosive device and a preparation method, and solves the problem of low preparation production efficiency of a traditional initiating explosive device cover plate. The group mold comprises a tin foil mold, a rubber plate, a hardboard and a bakelite plate. The method comprises the following steps: brushing 15% shellac varnish on the surface of a tin foil with the same size as a tin foil mold, brushing 45% rosin shellac varnish after airing, keeping the shellac varnish in a semi-dry state, paving on the tin foil mold, sequentially placing a rubber plate, a hardboard and a bakelite plate on the tin foil mold, and stacking a plurality of groups of molds together according to the process and the mold sequence, so as to obtain a finished product. And the rubber plate is extruded and deformed to punch the tin foil into 50 holes of the tin foil mold, the tin foil and the mold are taken down after punching is completed, and the tin foil cover plate is prepared. After the tin foil is prepared, the tin foil can be directly pressed into a product through the mold, and the production efficiency and the product quality of initiating explosive devices can be improved.

Description

Technical Field

[0001] The invention belongs to a method for making a tin foil cover sheet for explosive devices, and relates to devices such as a mold, a rubber plate, a cardboard and a bakelite board used in the preparation process of the tin foil cover sheet. The method uses the punching principle of a press to realize the preparation of multiple tin foil sheets at a time. Background Art

[0002] The cover sheet is one of the commonly used components in the structure of pyrotechnics. The specific process is to press-fit the cover sheet after the product is loaded with pressurized medicine, so as to ensure the sealing performance of the product. Common cover sheet materials include fabric, paper and metal. The existing technology adopts a single-shot punching method to prepare the cover sheet in advance, and then the cover sheet is passed through a mold or directly loaded into the product. This production process is suitable for the production of single-shot products. For the production of group mold products, because multiple cover sheets need to be pressed at one time, the cover sheet needs to be loaded into the mold in advance, and then the cover sheet is pressed into the product through the mold, which seriously restricts the production efficiency of the pyrotechnic group mold. At the same time, because the cover sheet is prepared in advance, it is directly loaded into the product during production or loaded into the product after a second mold. This process is easy to cause the cover sheet to fall off and deflect, affecting the yield rate of pyrotechnics. Summary of the invention

[0003] The preparation of traditional pyrotechnic cover sheets is carried out by single punching, which is not suitable for batch production lines and group mold production lines due to production efficiency issues, and will also cause quality problems. The purpose of the present invention is to complete the preparation of multiple cover sheets at one time through a special cover sheet preparation mold and auxiliary device, and the cover sheet preparation mold can be matched with the product mold, so as to complete the press-fitting of multiple cover sheets at one time, thereby improving the efficiency and yield rate of the pyrotechnic group mold production line.

[0004] The present invention is achieved by the following technical solutions:

[0005] A group mold for preparing a tin foil cover sheet for pyrotechnics comprises a tin foil mold, a rubber plate, a cardboard and a bakelite board. The tin foil mold comprises a tin foil board, which is connected to a first edge strip and a second edge strip by inlaying and fixed by screws. The tin foil board is provided with a plurality of holes according to the hole positions of the combined mold for producing pyrotechnics and the size of the tin foil cover sheet, including 50 tin foil holes and 8 mold positioning holes.

[0006] The cardboard is a composite cardboard, the bakelite is a synthetic bakelite, and the rubber plate is made of aviation rubber, and the sizes are consistent with the tinfoil mold.

[0007] A method for covering tin foil with explosives, comprising the following steps: brushing 15% shellac paint on the surface of tin foil with the same size as that of a tin foil mold, brushing 45% rosin shellac paint on the surface of the tin foil after the surface is dried, keeping the shellac paint in a semi-dry state, and then spreading it on the tin foil mold, placing a rubber plate, a cardboard and a bakelite board on the surface in sequence, stacking several groups of molds together according to the above process and mold sequence, putting them into a press for pressing, squeezing and deforming the rubber plate to punch the tin foil into 50 holes of the tin foil mold, removing the tin foil and the mold after completion, and preparing the tin foil covering.

[0008] After the tin foil is prepared, it can be directly pressed into the product through a mold, which is helpful to improve the production efficiency and product quality of explosives. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of a group mold for preparing a tin foil cover sheet of the present invention;

[0010] Figure 2 It is a schematic diagram of a tinfoil mold of the present invention. DETAILED DESCRIPTION

[0011] The group mold for preparing the tinfoil cover sheet of the present invention comprises four components including a bakelite board 1, a cardboard 2, a rubber board 3 and a tinfoil mold 4. The tinfoil mold 4 comprises a tinfoil plate 5, a plurality of holes arranged according to the hole positions of the combined mold for producing pyrotechnics and the size of the tinfoil cover sheet, including 50 tinfoil holes, the hole sizes of which are the same as the outer dimensions of the tinfoil to be prepared, and another 8 mold positioning holes; the tinfoil plate 5 is connected to the side strip 1 6 and the side strip 2 7 by an inlay manner and fixed by screws.

[0012] The rubber sheet 3 is made of aviation rubber and its size is consistent with the tin foil mold 4. After being deformed by pressure, the tin foil can be punched into the hole of the tin foil mold 4; the cardboard 2 is a composite cardboard, and the bakelite board 1 is a synthetic bakelite. Their sizes are consistent with the tin foil mold 4, and they play a supporting and pressure-balancing role in the preparation process.

[0013] The preparation process is to brush 15% shellac on the surface of a large tin foil of the same size as the tin foil mold 4, and then brush 45% rosin shellac after it is dried, keep the shellac in a semi-dry state, and then spread it on the tin foil mold 4, and then place a rubber sheet 3, a cardboard 2 and a bakelite board 1 on it in sequence. According to the above process and mold order, several groups of molds are stacked together, put into a press for pressing, and the rubber sheet 3 is squeezed and deformed to punch the tin foil into 50 holes of the tin foil mold. After completion, the tin foil and other molds are removed, and the tin foil cover is prepared. During production, the punched tin foil mold is combined with the pyrotechnic mold, and the product is pressed into it at one time through a specific device.

[0014] Through this preparation method, 50 rounds of preparation can be completed at one time according to the installation size requirements of the tin foil cover sheets, and all the tin foil cover sheets are kept in the mold without falling or deflecting. It takes an average of 10 seconds to prepare each mold of tin foil cover sheets, and it takes an average of 8 seconds to press each mold (50) of tin foil cover sheets into the pyrotechnics, which promotes the efficiency improvement of the group mold production line.

Claims

1. A group mold made of tin foil cover sheet for explosives, characterized by: It includes a tin foil mold, a rubber plate, a cardboard and a bakelite board. The tin foil mold includes a tin foil board. The tin foil board is connected to the side strips 1 and 2 by inlaying and fixed by screws. The tin foil board is provided with a number of holes according to the hole positions of the combined mold for the production of pyrotechnics and the size of the tin foil cover sheet, including tin foil holes and mold positioning holes.

2. The method for preparing a group mold of a tin foil cover sheet for explosives according to claim 1 is characterized in that: The cardboard is a composite cardboard, the bakelite is a synthetic bakelite, and the rubber plate is made of aviation rubber, and the sizes are consistent with the tinfoil mold.

3. A method for covering a pyrotechnic device with tin foil, characterized in that: Brush shellac on the surface of tin foil of the same size as the tin foil mold, and then brush rosin shellac after it is dried, keeping the shellac in a semi-dry state, and then spread it flat on the tin foil mold, and place rubber sheets, cardboard and bakelite boards on them in sequence, and stack several groups of molds together according to the above process and mold order, and put them into a press for pressing. The rubber sheet is squeezed and deformed to punch the tin foil into the hole of the tin foil mold. After completion, remove the tin foil and the mold, and the tin foil cover is ready.

4. A method for covering a tin foil sheet for explosives according to claim 3, characterized in that: Brush 15% shellac on the surface of tin foil of the same size as the tin foil mold, and then brush 45% rosin shellac after it dries.

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