Preparation method of micro-welding mould quick used plaster casting mold

A gypsum and precision casting technology, used in clay preparation devices, chemical instruments and methods, manufacturing tools, etc., can solve the problem that it cannot be used for casting small parts with one-time forming, smooth surface and dimensional accuracy, and gypsum casting cannot meet the requirements of micro-investment molds. The requirements of precision casting, etc., to achieve the effect of prolonging the solidification time, small crystal size, and high dimensional accuracy

Inactive Publication Date: 2008-06-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the gypsum mold produced by the current preparation method cannot meet the requirements of micro-investment casting, an

Method used

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  • Preparation method of micro-welding mould quick used plaster casting mold
  • Preparation method of micro-welding mould quick used plaster casting mold

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specific Embodiment approach 1

[0008] Specific embodiment one: In this embodiment, the gypsum casting mold for micro-investment casting is carried out according to the following steps: 1. Mix α or β hemihydraulic gypsum with a particle size of less than 200 meshes and deionized water at a mass ratio of 1:36 to 42 Stir for 10-20s, then stir for 15-40s under vacuum; 2. Inject the gypsum slurry mixed in step 1 into an impermeable model for ultrasonic force field action; 3. After stopping the ultrasonic force field, in air atmosphere, room temperature Place it for at least 48 hours under the same conditions to obtain the gypsum casting mold for micro-investment casting; wherein in step 2, the ultrasonic force field is introduced from the lower part of the slurry, the time for the ultrasonic force field to act is 4 to 10 minutes, and the introduction power of the ultrasonic force field is 50 ~500W, the action frequency of the ultrasonic force field is 20~100KHz.

[0009] At present, the preparation method of gyp...

specific Embodiment approach 2

[0016] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the temperature of α or β hemihydraulic gypsum in step 1 is 18-25°C. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0017] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the temperature of the deionized water in Step 1 is 18-25°C. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a preparation method of a gypsum mould for the precision casting of a micro-melting mold, pertaining to a gypsum mould preparation method. The invention solves the problem that: the gypsum mould produced by the current preparation method can not meet the requirements for the precision casting of micro-melting and be used for casting once-forming micro elements which have finish surface and high size accuracy. The preparation method is that: 1. Alpha or Beta semi-hydraulic gypsum and deionized water are mixed and stirred; 2. the gypsum slurry mixed and stirred in step one is poured into a water-proofing model and applied by ultrasonic field; 3. micro-melting investment casting gypsum mould is obtained after the ultrasonic field is stopped and the gypsum slurry is placed in the air and at room temperature. The method of the precision casting of the micro-melting gypsum mould adopted by the invention changes crystal microstructure of the solidified gypsum slurry by means of adding physical field and reduces the crystal size so as to produce the gypsum mould which meets the requirement of micro-melting investment casting, and cast once-forming micro elements with bright surface and high size accuracy.

Description

technical field [0001] The invention relates to a preparation method of a gypsum casting mold. Background technique [0002] Investment casting begins by making a fusible pattern of fusible material that is comparable to the part being cast, usually by injecting wax into a reverse-engineered pattern, or by making it on top of wax pattern material. Modeling materials can be natural waxes, artificial waxes, polystyrene, mixtures of various waxes, or other thermoplastic materials, sometimes non-exclusively including some fillers such as fatty acids and plasticizers. Micro-investment casting refers to the casting of more precise tiny parts on the basis of investment casting. The mentioned tiny parts refer to castings whose outline size is only a few hundred microns, and the smallest fine parts are only tens of microns. It is impossible to carry out any mechanical cleaning and trimming after casting and forming of tiny parts. It must be cast and formed at one time. Therefore, th...

Claims

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Application Information

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IPC IPC(8): B28B1/00B28C1/02
CPCC04B28/146C04B2111/00939C04B2111/00137C04B28/147
Inventor 李邦盛杨闯任明星傅恒志
Owner HARBIN INST OF TECH
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