CN101486074A - Disappearance core production method - Google Patents

Abstract

The invention discloses a disappearing core-making method, which is used for making a sand core with complex shape. The disappearing core-making method comprises the following steps: adopting foaming technology to manufacture low melting point materials into a sand core filler block according to the shape of a casting to be processed; placing the sand core filler block into a core-making die, fixing the sand core filler block with the die, and forming a core-making core box; adopting cold core box core-making technology to fill sand into the core box, and taking out a sand core and the sand core filler block which is connected with the sand core from the core box after the core sand is solidified; and roasting the sand core and the sand core filler block, and obtaining the sand core after the filler block disappears. Because the sand core with the complex shape is integrally formed, the casting processed by the sand core has stable dimension, high precision, light weight and high quality.

Description

Disappearance core production method

Technical field

The present invention relates to a kind of core manufacturing craft, be specifically related to a kind of disappearance core production method.

Background technology

In the prior art, the inner core that forms complex-shaped foundry goods is because the particularity of shape, and die for making core is difficult to one and makes, so inner core needs to be connected to form behind the split production, and the dimensional stability of the foundry goods that processes like this is lower.

Summary of the invention

The purpose of this invention is to provide a kind of disappearance core production method that integral production goes out complex-shaped core that is used for.

For achieving the above object, the technical solution used in the present invention is: a kind of disappearance core production method, be used to make complex-shaped core, and comprise following operation:

(1) shape according to foundry goods to be processed adopts foam process to make sand core filler block low melting material;

(2) above-mentioned sand core filler block is placed in the die for making core, and fixes, form the coremaking core box thus with mould;

(3) adopt cold core box core process, back-up sand in described core box, core sand solidify finish after, take out core in the described core box and be connected in sand core filler block on the described core;

(4) baking core and sand core filler block will promptly make core after the mistake of filling block burning.

Described low melting material adopts the foamed material of low melting point, high rigidity.

Because the present invention has adopted above technical scheme, its advantage is:, stablize precision height, foundry goods in light weight, quality height because this complex-shaped core is integrally formed by the casting dimension that core processes.

Description of drawings

The core that accompanying drawing 1 is produced for the present invention processes the front view of foundry goods;

Accompanying drawing 2 is for being made the front view of sand core filler block by the shape of foundry goods among the present invention;

Accompanying drawing 3 is connected the front view that forms the coremaking core box on the die for making core for sand core filler block among the present invention.

The specific embodiment

Further set forth process of the present invention below in conjunction with accompanying drawing.

Shown in accompanying drawing 1-3, a kind of disappearance core production method, be used to make complex-shaped core, Fig. 1 has shown a kind of special-shaped core, be used to process lid shape foundry goods with complicated inner cavity structure, the operation of this core production method is as follows: (1) adopts foam process to make identical shaped sand core filler block 2 low melting material according to the cavity shape in the foundry goods to be processed, and wherein low melting material adopts the foamed material of low melting point, high rigidity, as shown in Figure 2; (2) above-mentioned sand core filler block 2 is placed in the die for making core 4, and fixes, form coremaking core box 3 thus, multiple usual ways such as that the stationary positioned of sand core filler block 2 and mould 4 can adopt is bonding, bolting with mould 4; (3) adopt cold core box core process, after finishing back-up sands in the core box 3, core sand on the core shooter and solidifying, in core box 3, eject core 1, be connected with sand core filler block 2 on the core 1 simultaneously; (4) baking core 1 and sand core filler block 2 promptly makes core 1 filling block 2 burnt mistake in oxygen after.Core 1 processing foundry goods by this one makes can improve the foundry goods precision, stablizes casting dimension, reduces the weight of foundry goods, improves casting quality.

Claims (2)

1, a kind of disappearance core production method is used to make complex-shaped core, it is characterized in that: comprise following operation:

(1) shape according to foundry goods to be processed adopts foam process to make sand core filler block (2) low melting material;

(2) above-mentioned sand core filler block (2) is placed in the die for making core, and fixes, form coremaking core box (3) thus with mould;

(3) adopt cold core box core process, back-up sand described core box (3) in after core sand curing is finished, is taken out core (1) in the described core box and is connected in sand core filler block (2) on the described core (1);

(4) baking core (1) and sand core filler block (2) will promptly make core (1) after the mistake of filling block (2) burning.

2, disappearance core production method according to claim 1 is characterized in that: described low melting material adopts the foamed material of low melting point, high rigidity.

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