CN103506574B

CN103506574B - The casting method of thin-walled Steel Casting in Investment Casting moulding by casting

Info

Publication number: CN103506574B
Application number: CN201210227767.9A
Authority: CN
Inventors: 吴金海
Original assignee: Jiashan Sinhai Precision Castings Co Ltd
Current assignee: Jiashan Sinhai Precision Castings Co Ltd
Priority date: 2012-06-27
Filing date: 2012-06-27
Publication date: 2015-11-25
Anticipated expiration: 2032-06-27
Also published as: CN103506574A

Abstract

The invention discloses a kind of casting method of thin-walled Steel Casting in Investment Casting moulding by casting; Its objective is the situation in order to avoid there is foundry goods shrinkage cavity, loose or casting deformation; It comprises the following steps: a, first to prepare many diameters be 0.5mm-1mm, and length is the thread metal object of 50mm-100mm, and at the thick wax of outer surface brushing one deck 0.1mm-0.2mm of above-mentioned thread metal object; B, then by the wax-pattern group after the thread metal object insertion group tree in previous step, insertion depth is 4mm-8mm; C, then by the thread metal object in previous step with wax-pattern group stickness paint slurry and be coated with hanging sand; D, to be formed after formwork on wax-pattern group surface, first destroy the part formwork of thread metal object other end head surface, extract thread metal object out, then carry out dewaxing, roasting; When e, last pour steel, the cavity formed after formwork extracts thread metal object is utilized to carry out drainage.The present invention improves casting qualified rate.

Description

The casting method of thin-walled Steel Casting in Investment Casting moulding by casting

Technical field

The present invention relates to a kind of casting method, particularly the casting method of thin-walled Steel Casting in Investment Casting moulding by casting.

Background technology

Steel-casting because of its mechanical performance high, low price, is widely used in the fields such as Aeronautics and Astronautics, boats and ships, electronics, five metals, pump valve; But because it is than great, this proportion is 7.8 grams/cm3, the weight such as the parts be assembled into by it or equipment are large, even occur overweight condition, constrain effect of parts and equipment to a certain extent.Therefore, in steel casting structural design, when not affecting mechanical performance, gradually to thin-walled, light-duty development, to alleviate the weight of parts or equipment, improve its effect.

But due to the intrinsic casting characteristics of steel casting, thin wall type foundry goods not easily moulding by casting, particularly wall thickness are less than the product of below 2mm, easily produce defects such as owing casting, cold shut, misrun, qualification rate is not high, has a strong impact on manufacturing schedule and increases production cost.

With regard to investment casting method, for the defect problem such as deficient casting, cold shut, misrun of thin wall type foundry goods, traditional method is by improving liquid steel temperature or improving poring rate or set up the methods such as cast drainage muscle; Wherein increase the method for cast drainage muscle, as shown in fig. 1.But these methods are with and are served negative issue simultaneously, as: the tendency increasing foundry goods shrinkage cavity, the defect such as loose, drainage muscle is pullled foundry goods and is caused distortion, increases processing cost etc.

Summary of the invention

The object of the invention is to solve the deficiencies in the prior art, a kind of situation avoiding occurring foundry goods shrinkage cavity, loose or casting deformation is provided, and the casting method of thin-walled Steel Casting in Investment Casting moulding by casting of production cost can also be reduced.

To achieve these goals, the casting method of the thin-walled Steel Casting in Investment Casting moulding by casting designed by the present invention, it comprises the following steps:

A, first to prepare many diameters be 0.5mm-1mm, and length is the thread metal object of 50mm-100mm, and at the thick wax of outer surface brushing one deck 0.1mm-0.2mm of above-mentioned thread metal object;

B, then by the wax-pattern group after the thread metal object insertion group tree in previous step, insertion depth is 4mm-8mm;

C, then by the thread metal object in previous step with wax-pattern group stickness paint slurry and be coated with hanging sand;

D, to be formed after formwork on wax-pattern group surface, first destroy the part formwork of thread metal object other end head surface, extract thread metal object out, then carry out dewaxing, roasting;

When e, last pour steel, the cavity formed after formwork extracts thread metal object is utilized to carry out drainage.

Another kind of casting method of the present invention, it specifically comprises the following steps:

A, first prepare many diameter 0.5mm-1mm, length is the fine rule of 50mm-100mm, require that the bending strength of above-mentioned fine rule is greater than 15Mpa, and scaling loss gasification temperature is lower than 800 DEG C simultaneously;

B, then the fine rule one end glue in previous step is bonded at group tree after wax-pattern group on, bond length is 4mm-6mm;

C, then by the fine rule in previous step with wax-pattern group stickness paint slurry and be coated with hanging sand;

D, to be formed after formwork on wax-pattern group surface, then carry out dewaxing, roasting, on formwork, form cavity after fine rule burning;

When e, last pour steel, the cavity in previous step is utilized to carry out drainage.

The casting method of the thin-walled Steel Casting in Investment Casting moulding by casting that the present invention obtains, when adopting the method to carry out moulding by casting, it does not only occur owing the situations such as casting, cold shut, misrun, can not cause again foundry goods shrinkage cavity, loose or distortion simultaneously, promote casting qualified rate; And enterprise's production cost can also be reduced.

Accompanying drawing explanation

Fig. 1 is the structural representation in conventional casting methods, formwork increasing cast drainage muscle;

Fig. 2 is that in embodiment 1, wax-pattern group plugs the schematic diagram after iron wire;

Fig. 3 is the structural representation at A-A place in Fig. 2;

Fig. 4 be in embodiment 1 formwork make after schematic diagram;

Fig. 5 is the structural representation at B-B place in Fig. 4;

Fig. 6 is that in embodiment 2, wax-pattern group plugs the schematic diagram after rigid plastics line;

Fig. 7 is the structural representation at C-C place in Fig. 6;

Fig. 8 be in embodiment 2 formwork make after schematic diagram;

Fig. 9 is the structural representation at D-D place in Fig. 8.

Detailed description of the invention

Below in conjunction with drawings and Examples, the present invention is further described.

Embodiment 1:

As shown in Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the casting method of the thin-walled Steel Casting in Investment Casting moulding by casting that the present embodiment provides, it comprises the following steps:

A, first to prepare many diameters be 0.5mm, and length is the straight iron wire of 50mm, and at the thick wax of outer surface brushing one deck 0.1mm of above-mentioned straight iron wire;

B, then by the wax-pattern group 3 after the straight iron wire insertion group tree in previous step, insertion depth is 4mm;

C, then by the straight iron wire in previous step with wax-pattern group 3 stickness paint slurry and be coated with hanging sand;

D, to be formed after formwork 4 on wax-pattern group 3 surface, first destroy the part formwork 4 of straight iron wire other end head surface, extract straight iron wire out, then carry out dewaxing, roasting;

When e, last pour steel, the cavity 5 formed after formwork 4 extracts straight iron wire is utilized to carry out drainage.

Embodiment 2

As described in Fig. 6, Fig. 7, Fig. 8 and Fig. 9, the casting method of the thin-walled Steel Casting in Investment Casting moulding by casting that the present embodiment provides, it comprises the following steps:

A, first prepare many diameter 1mm, length is the rigid plastics line of 100mm, and the bending strength of above-mentioned rigid plastics line is greater than 15Mpa, and scaling loss gasification temperature is lower than 800 DEG C;

B, then the rigid plastics line one end glue in previous step is bonded at group tree after wax-pattern group 3 on, bond length is 6mm;

C, then by the rigid plastics line in previous step with wax-pattern group 3 stickness paint slurry and be coated with hanging sand;

D, to be formed after formwork 4 on wax-pattern group 3 surface, then carry out dewaxing, roasting, on formwork 4, form cavity 5 after the burning of rigid plastics line;

When e, last pour steel, the cavity 5 in previous step is utilized to carry out drainage.

Rigid plastics common in above-mentioned has polyformaldehyde, polystyrene or Merlon etc.

Claims

1. a casting method for thin-walled Steel Casting in Investment Casting moulding by casting, is characterized in that, it comprises the following steps:

A, first prepare many diameter 0.5mm-1mm, length is the fine rule (6) of 50mm-100mm, the bending strength of described fine rule (6) be greater than 15MPa and scaling loss gasification temperature lower than 800 DEG C;

B, then fine rule (6) one end glue in previous step is bonded at group tree after wax-pattern group (3) on, bond length is 4mm-6mm;

C, then by the fine rule (6) in previous step with wax-pattern group (3) stickness paint slurry and be coated with hanging sand;

D, after wax-pattern group (3) surface forms formwork (4), then carry out dewaxing, roasting, on formwork (4), form cavity (5) after fine rule (6) burning;

When e, last pour steel, the cavity (5) in previous step is utilized to carry out drainage.