CN112727636A

CN112727636A - Forming die for combustion-limiting layer of small-diameter engine combustion chamber

Info

Publication number: CN112727636A
Application number: CN202011499032.2A
Authority: CN
Inventors: 杨三月
Original assignee: Inner Mongolia Aerospace Hongxia Chemical Co ltd
Current assignee: Inner Mongolia Aerospace Hongxia Chemical Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-04-30

Abstract

The invention relates to the field of solid rocket engines, in particular to a forming die for a combustion-limiting layer of a small-diameter engine combustion chamber, which comprises an upper male die, a female die and a lower male die, wherein the upper male die and the lower male die are embedded on the female die, the middle of the upper male die protrudes by 1.0mm, the middle of the lower male die is recessed by 0.6mm, the upper male die is connected with the female die through a bolt, the lower male die is connected with the female die through a bolt, and the female die is provided with a discharge groove. The forming die for the combustion-limiting layer of the small-diameter engine combustion chamber provided by the invention has the advantages of easiness in discharging, easiness in forming, easiness in demolding, complete forming structure and capability of meeting the process requirements for forming size. The dimensional and surface quality qualified rate of the formed flame-retardant layer is increased from 60% to 90%.

Description

Forming die for combustion-limiting layer of small-diameter engine combustion chamber

Technical Field

The invention relates to the field of solid rocket engines, in particular to a forming die for a combustion-limiting layer of a combustion chamber of a small-diameter engine.

Background

The forming of the flame-retardant layer is always carried out by using the traditional flame-retardant layer die, and the structure mainly comprises an upper male die, a female die and a lower male die. The mold with a simple structure can not effectively ensure the surface quality of the flame-retardant layer, so that the geometric dimension of the formed flame-retardant layer is considered, the material discharge after the material feeding is considered, and the material discharge and exhaust functions in the installation process of the upper male mold are considered. Because the slurry has high viscosity and is not easy to exhaust, if the column section is designed to be in a bottom die and female die structure for molding, bubbles in the slurry added in a natural state cannot be removed, and therefore, an upper male die, a female die and a lower male die structure are adopted. The existing mould structure has the following defects: 1) discharging is not smooth, 2) the end face structure design of the lower male die is unreasonable, and the thickness of the end face of the formed flame-retardant layer is easy to exceed the upper difference.

Disclosure of Invention

The technical problems to be solved by the invention are as follows:

the invention provides a forming die for a combustion-limiting layer of a small-diameter engine combustion chamber, which is easy to discharge, form and demold, has a complete forming structure, and meets the process requirements in forming size.

The technical scheme adopted by the invention is as follows:

a small diameter engine combustion chamber flame-retardant layer forming die, includes: the male die comprises an upper male die, a female die and a lower male die, wherein the upper male die and the lower male die are embedded on the female die, the middle of the upper male die protrudes by 1.0mm, the middle of the lower male die is recessed by 0.6mm, the upper male die is connected with the female die through a bolt, the lower male die is connected with the female die through a bolt, and a discharge groove is formed in the female die.

Further, the discharge gap between the upper male die and the female die is designed to be 0.15 mm.

The invention has the beneficial effects that:

the invention can realize easy discharge, easy molding, easy demoulding, complete molding structure and molding size meeting the process requirements. The dimensional and surface quality qualified rate of the formed flame-retardant layer is increased from 60% to 90%.

Drawings

FIG. 1 is a schematic structural diagram of a forming die of a combustion-limiting layer of a small-diameter engine combustion chamber.

FIG. 2 is a schematic view of a guiding and discharging structure.

The device comprises a bolt 1, an upper male die 2, a female die 3, a lower male die 4, a screw 5, a jackscrew 6, a guide section 7, a discharge groove 8 and a combustion-limiting layer 9.

Detailed Description

As shown in fig. 1, a small diameter engine combustion chamber combustion-limiting layer forming die comprises: the male die comprises an upper male die, a female die and a lower male die, wherein the upper male die and the lower male die are embedded on the female die, the middle of the upper male die protrudes by 1.0mm, the middle of the lower male die is recessed by 0.6mm, the upper male die is connected with the female die through a bolt, the lower male die is connected with the female die through a bolt, and a discharge groove is formed in the female die. The discharge gap between the upper male die and the female die is designed to be 0.15 mm.

As shown in figure 2, the amount of slurry contained in the discharge groove is 2 times of the volume of slurry actually discharged, the residual 1/2 space in the discharge groove is reserved for bubbles in the feeding slurry, the discharge gap between the upper male die and the female die is designed to be 0.15mm, excessive materials are easily extruded completely when the gap is large, the bubbles are easy to remain, the apparent quality of the solidified combustion-limiting layer is unqualified, and the slurry is discharged after the bubbles remain in the slurry when the gap is not more than 0.2mm, so that the product quality is ensured. When the mold is split, firstly, the material degree is considered to be large (the viscosity is 300-700 Pa.S), after the limit mold and the lower male mold are connected, slurry is added, bubbles wrapped in the added material are removed completely, and after comprehensive analysis, a section with a short column section is formed in a mode of connecting the limit mold and the lower male mold.

Claims

1. The utility model provides a minor diameter engine combustion chamber flame-retardant layer forming die which characterized in that includes: the male die comprises an upper male die, a female die and a lower male die, wherein the upper male die and the lower male die are embedded on the female die, the middle of the upper male die protrudes by 1.0mm, the middle of the lower male die is recessed by 0.6mm, the upper male die is connected with the female die through a bolt, the lower male die is connected with the female die through a bolt, and a discharge groove is formed in the female die.

2. The small-diameter engine combustion chamber combustion-limiting layer forming die of claim 1, characterized in that: the discharge gap between the upper male die and the female die is designed to be 0.15 mm.