CN103658546A - Large-size shell core cast baking method - Google Patents

Abstract

The invention relates to a large-size shell core cast baking method, and belongs to the technical field of casting processes. The method comprises: (1) decomposing a large-size cast shell core into 2-3 or a plurality of small shell cores; (2) placing the decomposed shell cores on a baking rack to bake; (3) cooling the shell cores to a room temperature, and adhering the baked shell cores into the whole shell core by using an adhesive; (4) placing the whole shell core on the baking rack to carry out secondary baking; and (5) cooling and discharging out of the furnace. According to the method, the large-size cast shell core is decomposed into the plurality of the small shell cores, and single shell core baking, adhering and secondary baking are sequentially performed, such that the gas generation of the shell core can be effectively reduced, the quality problem that the cast has pores due to the high gas generation of the shell core can be effectively avoided, and the qualification rate of the product is improved.

Description

A kind of baking method of large-scale shell core foundry goods

Technical field

The present invention relates to a kind of baking method of large-scale shell core foundry goods, belong to Casting Technology field.

Background technology

During metallic mould casting large-size castings, when shell core size is large, shell core is in sealing or semi-enclosed situation, guarantee the intensity of shell core, the crust thickness of the peritonaeum resin sand shell core of blowing out is relatively thick, and high temperature alloy liquid is in when cast and the effect of shell core generation heat-flash, produce larger gas forming amount, a large amount of gases that shell core produces can not be got rid of completely, will enter into aluminium alloy, after alloy graining, in foundry goods, form pore, causing foundry goods scrappage is 40-67%.

Summary of the invention

The object of the invention is to provide a kind of baking method of large-scale shell core foundry goods, can reduce the gas forming amount of shell core, effectively reduces a large amount of gases that produce compared with large shell core and can not get rid of completely and enter into aluminium alloy, forms the quality problems of pore in foundry goods.

To achieve these goals, the present invention is by the following technical solutions:

A baking method for large-scale shell core foundry goods, is characterized in that: comprise the following steps:

(1) shell core of heavy castings is resolved into 2～3 or a plurality of less shell core.

(2) resolving into single shell core, be placed on baking rack, gap between shell core is not less than 10mm, oven furnace temperature pushes the baking rack of putting shell core well in oven and heats up and toast when being not less than 70 ℃, heating-up time is not less than 30 minutes, furnace temperature rises to 270 ± 10 ℃ of baking 1-1.5 hour, when shell core is baked to color, is dark-brown.

(3) shell core is cooled to room temperature, with adhesive glue, baked single shell core is bonded into whole shell core.

(4) whole shell core is placed on baking rack, oven furnace temperature pushes oven when being not less than 70 ℃, and the heating-up time is not less than 30 minutes, is warming up to 160 ± 10 ℃, toasts 0.5 hour.

(5) cooling, come out of the stove.

Method of the present invention is decomposed a plurality of by the shell core of heavy castings, carry out after single baking bonding, carry out again secondary baking, can effectively reduce the gas forming amount of shell core, while playing the large shape shell core of metal type cast foundry goods, effectively avoid causing greatly because of the gas forming amount of shell core the effect of the leachy quality problems of foundry goods, improved the qualification rate of product.

The specific embodiment

Below in conjunction with specific embodiment, the present invention is further illustrated, but described in claimed scope is not limited to.

The present invention is a kind of baking method of large-scale shell core foundry goods, it is characterized in that: comprise the following steps:

(1) shell core of heavy castings is resolved into 2～3 or a plurality of less shell core.

(2) resolving into single shell core, be placed on baking rack, gap between shell core is not less than 10mm, oven furnace temperature pushes the baking rack of putting shell core well in oven and heats up and toast when being not less than 70 ℃, heating-up time is not less than 30 minutes, furnace temperature rises to 270 ± 10 ℃ of baking 1-1.5 hour, when shell core is baked to color, is dark-brown.

(3) shell core is cooled to room temperature, with adhesive glue, baked single shell core is bonded into whole shell core.

(4) whole shell core is placed on baking rack, oven furnace temperature pushes oven when being not less than 70 ℃, and the heating-up time is not less than 30 minutes, is warming up to 160 ± 10 ℃, toasts 0.5 hour.

(5) cooling, come out of the stove.

Claims (1)

1. a baking method for large-scale shell core foundry goods, is characterized in that: comprise the following steps:

(1) shell core of heavy castings is resolved into 2～3 or a plurality of less shell core.

(2) resolving into single shell core, be placed on baking rack, gap between shell core is not less than 10mm, oven furnace temperature pushes the baking rack of putting shell core well in oven and heats up and toast when being not less than 70 ℃, heating-up time is not less than 30 minutes, furnace temperature rises to 270 ± 10 ℃ of baking 1-1.5 hour, when shell core is baked to color, is dark-brown.

(3) shell core is cooled to room temperature, with adhesive glue, baked single shell core is bonded into whole shell core.

(4) whole shell core is placed on baking rack, oven furnace temperature pushes oven when being not less than 70 ℃, and the heating-up time is not less than 30 minutes, is warming up to 160 ± 10 ℃, toasts 0.5 hour.

(5) cooling, come out of the stove.