CN205270745U - Fire -retardant insulation riser of aviation machine casket magnesium alloy casting - Google Patents

Abstract

The utility model discloses a fire -retardant insulation riser of aviation machine casket magnesium alloy casting relates to metal processing technology field, and the improvement of concretely relates to fire -retardant insulation riser of aviation machine casket magnesium alloy casting structure is technological. Including aviation machine casket foundry goods, there is the rising head above the aviation machine casket foundry goods, be magnesium oxide inlayer rising head in the rising head, magnesium oxide inlayer rising head appearance is the toper of invering, and big, lower little stairstepping hole is gone up to magnesium oxide inlayer rising head hole, there is conical aluminium silicate heat preservation magnesium oxide inlayer rising head outside. The utility model provides a magnesium alloy aviation machine casket during fabrication, when as cast rising head diameter one regularly, highly great, the rising head is out of shape, influences product quality's problem.

Description

Aviation casing magnesium alloy cast fire-retardant heat insulation rising head

Technical field

This utility model relates to metal working technical area, is specifically related to the improvement opportunity of aviation casing magnesium alloy cast fire-retardant heat insulation dead head structure.

Background technology

Magnesium alloy has lightweight, and specific strength and specific stiffness are high, and damping shock absorption is good, capability of electromagnetic shielding and perfect heat-dissipating, the advantages such as casting forming function is excellent, and machining property is good, and therefore magnesium alloy is adapted in specific field application, for instance aviation field. Magnesium alloy is inhaled with its height and is made an uproar ability, good forming processing performance than performance, prominent vibration damping and the feature such as be easily recycled, and is described as the green structural material in 2l century. But the chemical property of magnesium is active, strong with the affinity of oxygen, the oxide-film of densification can not be formed after high-temperature oxydation. Therefore, magnesium alloy is prone to oxidizing fire in melting, liquid forming and heat treatment process, it is desirable to provide effective fire-resisting protection. At high temperature, especially fire-retardant under molten condition is for magnesium and alloy thereof: adopt method physically or chemically, forms effective protection aquiclude on its surface, completely cuts off air on the one hand, stops magnesium evaporation on the one hand, reaches to slow down oxidation, fire-retardant purpose. From the twenties in 20th century, magnesium alloy is just applied at aerospace field.

The aviation casing using magnesium alloy can alleviate weight, improves the mobility of aerospace vehicle, reduce oil consumption, brings considerable economic benefit.

During fabrication, the effect of insulated feeder is the feeding efficiency improving rising head by extending rising head setting time to the aviation casing of magnesium alloy. In Foundry Production, arranging one of rising head important measures being to ensure that casting quality, its Main Function is that foundry goods is carried out feeding. According to modulus calculation, casting alloy typically requires the rising head identical with foundry goods volume to be carried out feeding this means that in Foundry Production the metal of nearly 50 to carry out melting again, improves casting quality and rising head utilization rate. Insulated feeder can be adopted. Insulated feeder is by controlling rising head heat waste, extends riser metal liquid setting time, improves riser supplement shrink efficiency. This is possible not only to save riser metal liquid, and to improving casting quality important in inhibiting. The shape of existing insulated feeder is generally adopted cylindrical and two kinds of forms of kidney-shaped. Owing in casting process, technological parameter is difficult to constant, so the diametric(al) of insulated feeder is reduced to about 0.8 times, highly constant. Owing to insulated feeder and foundry goods volume need certain ratio, so rising head diameter one timing, highly relatively big, rising head deforms, and affects product quality.

Summary of the invention

This utility model provides aviation casing magnesium alloy cast fire-retardant heat insulation rising head, and this utility model solves the aviation casing of magnesium alloy during fabrication, and when rising head diameter one timing of casting, highly relatively big, rising head deforms, the problem affecting product quality.

For solving the problems referred to above, this utility model adopts the following technical scheme that aviation casing magnesium alloy cast fire-retardant heat insulation rising head, including aviation casing foundry goods, has rising head above aviation casing foundry goods; Being magnesium oxide internal layer rising head in rising head, magnesium oxide internal layer rising head profile is inverted taper, and magnesium oxide internal layer rising head endoporus is the stepped bore of upper big, lower small; The aluminium silicate heat-insulation layer of taper is had outside magnesium oxide internal layer rising head.

This utility model advantage: the aviation casing of magnesium alloy is at the cone shape that the insulated feeder cast is ladder, and top major diameter rising head can hold more raw material, and riser height can reduce, convenient manufacture. Rising head adopts aluminium silicate heat-insulation layer, high insulating effect, the constant product quality of production.

Accompanying drawing explanation

Fig. 1 is this utility model structural representation.

Symbol description in figure: aviation casing foundry goods 1, rising head 2, shrinkage cavity 3, aluminium silicate heat-insulation layer 4, magnesium oxide internal layer rising head 5.

Detailed description of the invention

By best embodiment, this utility model is described in detail below��

As it is shown in figure 1, aviation casing magnesium alloy cast fire-retardant heat insulation rising head, including aviation casing foundry goods 1, above aviation casing foundry goods 1, there is rising head 2; Being magnesium oxide internal layer rising head 5 in rising head 2, magnesium oxide internal layer rising head 5 profile is inverted taper, and magnesium oxide internal layer rising head 5 endoporus is the stepped bore of upper big, lower small; The aluminium silicate heat-insulation layer 4 of taper is had outside magnesium oxide internal layer rising head 5. Insulated feeder is the cone shape of ladder, and rising head is formulated according to designing requirement with parts connecting portion diameter, and top major diameter rising head can hold more raw material, and riser height can reduce, and convenient manufactures. The wall thickness of insulated feeder; The wall thickness of insulated feeder is the key factor affecting feeding effect. Too thin moulding difficulty, and heat insulation effect is poor; Too thick that heat insulation effect impact is little, but increase cost, general wall thickness takes the 18-20 of rising head diameter, the thinnest cannot be less than 20mm. Aluminium silicate is with hard paste grog for raw material, is the heat insulating material replacing asbestos, the heatproof of aluminium silicate wool: 800-1200 degree Celsius.

Insulated feeder of the present utility model has following characteristics: 1, have good heat-insulating property; 2, there is good high-temperature flame-proof performance; 3, there is good chemical stability under high temperature; 4, there is enough dry strength, wet strength; 5, use procedure does not produce environmental pollution, meet environmental requirement; 6, cheap, raw material sources is extensively, easily purchase.

Last it is noted that obvious, above-described embodiment is only for clearly demonstrating this utility model example, and is not the restriction to embodiment. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without also cannot all of embodiment be given exhaustive. And the apparent change thus amplified out or variation are still among protection domain of the present utility model.

Claims (1)

1. aviation casing magnesium alloy cast fire-retardant heat insulation rising head, including aviation casing foundry goods, has rising head above aviation casing foundry goods; It is characterized in that, be magnesium oxide internal layer rising head in rising head, magnesium oxide internal layer rising head profile is inverted taper, and magnesium oxide internal layer rising head endoporus is the stepped bore of upper big, lower small; The aluminium silicate heat-insulation layer of taper is had outside magnesium oxide internal layer rising head.