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Water soluble mandrel moulding method of dipulse engine shell

The invention relates to a technology of an engine casing and a forming method, which is applied in the field of water-soluble core mold forming of a double-pulse engine casing, and can solve the problems of complex manufacturing technology of the core mould of the engine casing, damage to the metal part of the engine casing, long production cycle, and the like. Achieve the effect of low cost, short production cycle and less equipment investment

Active Publication Date: 2013-10-02
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the core mold manufacturing technology of this type of engine casing is very complicated, it has become the primary constraint for its promotion
The mandrel of the existing filament winding engine is mainly a metal skeleton gypsum mandrel, which is not only complicated in design, but also has a long production cycle, especially for the manufacture of structures with large aspect ratio, small openings, and multiple pulses, and cannot completely rely on the metal skeleton gypsum mandrel
In the face of this situation, some technicians try to use soluble salt core molds, but because salt core molds are corrosive, they will damage the metal parts of the engine casing, so it is generally not recommended to use them.

Method used

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  • Water soluble mandrel moulding method of dipulse engine shell
  • Water soluble mandrel moulding method of dipulse engine shell
  • Water soluble mandrel moulding method of dipulse engine shell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] see Figure 1 to Figure 5 , the water-soluble mandrel of the dual-pulse engine casing involved in the method of the present invention includes a partition plate 1, a mandrel 2, a shaft sleeve 3, a sand sleeve 4 and a lock nut 6.

[0025] The mandrel 2, the shaft sleeve 3 and the sand sleeve 4 are coaxially matched from the inside to the outside, and the sand sleeve 4 is divided into two parts, respectively corresponding to the first pulse zone (not shown in the figure) and the second pulse zone of the engine. The first pulse zone sand jacket 4.1 and the second pulse zone sand jacket 4.2 in the zone (not shown in the figure), the partition 1 is arranged between the first pulse zone sand jacket 4.1 and the second pulse zone sand jacket 4.2. Since the sand sleeve 4.1 in the first pulse area is relatively long, it is divided into two parts in the present embodiment, so that the sand sleeve 4 is divided into three sections on the whole, and the axle sleeve 3 is also divided ...

Embodiment 2

[0037] The present embodiment is basically the same as Example 1, the difference being: B, preparation of quartz sand mixed adhesive, said quartz sand mixed adhesive comprises the following components and parts by weight: 400 grams of quartz sand, 9.5 grams of polyvinyl alcohol, 0.5 grams of starch grams, 40 grams of water; when preparing the quartz sand mixed adhesive, first mix polyvinyl alcohol and starch to form a mixed powder, then mix the mixed powder with 60°C water and stir until a non-sticky solution is formed, and finally the particle size is 140 mesh quartz sand Stir to combine with the non-sticky solution.

Embodiment 3

[0039] The present embodiment is basically the same as Example 1, except that: B, prepare the quartz sand mixed adhesive, which includes the following components and parts by weight: 450 grams of quartz sand, 10 grams of polyvinyl alcohol, 0.6 grams of starch 50 grams of water; when preparing the quartz sand mixed adhesive, first mix polyvinyl alcohol and starch to form a mixed powder, then mix the mixed powder with 80°C water and stir until a non-sticky solution is formed, and finally the particle size is 180 mesh quartz sand Stir to combine with the non-sticky solution.

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Abstract

The invention discloses a water soluble mandrel moulding method of a dipulse engine shell. The method comprises the following steps of: A, preparing a separator, a dabber and a shaft sleeve matched coaxially; B, preparing a quartz sand mixed cementing compound which comprises the following components in parts by weight: 350-450 parts of quartz sand, 9-10 parts of polyvinyl alcohol, 0.4-0.6 part of starch and 30-50 parts of water; first, mixing polyvinyl alcohol and starch to form mixed powder, then, mixing and stirring the mixed powder with water to form grume-free liquor, and finally, stirring and mixing quartz sand with the grume-free liquor; C, moulding the quartz sand mixed cementing compound as a sand sleeve; D, curing the sand sleeve; E, processing the external surface of the sand sleeve and the inner end face of the sand sleeve; F, assembling the dabber, the separator, the shaft sleeve and the sand sleeve; and G, performing surface treatment for the sand sleeve. The method disclosed by the invention is simple in moulding process, short in production period and low in cost, satisfies the design demand, and is suitable for being widely applied to the technical field of moulding solid rocket engine shells.

Description

technical field [0001] The invention relates to the technical field of solid rocket motor casing molding, in particular to a method for molding a water-soluble mandrel for a double-pulse motor casing. Background technique [0002] Filament-wound motor shells represent the main development direction of solid rocket motors in the future, especially multi-pulse, large aspect ratio, and small opening winding motors have become a research hotspot. However, because the core mold manufacturing technology of this type of engine casing is very complicated, it has become the primary constraint for its promotion. The core mold of the existing filament winding engine is mainly a metal skeleton gypsum mandrel, which is not only complicated in design, but also has a long production cycle, especially for the manufacture of structures with large aspect ratios, small openings, and multiple pulses, and cannot completely rely on metal skeleton gypsum core molds . Faced with this situation, s...

Claims

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Application Information

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IPC IPC(8): B29C67/00B29C67/24
Inventor 魏虹霍文静张志斌邓德凤黄泽勇
Owner 湖北三江航天江北机械工程有限公司
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