Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A preparation method based on composite fiber reinforced investment casting shell

A technology of composite fiber and investment pattern, which is applied in the direction of casting molding equipment, casting mold, casting mold composition, etc., can solve the problems affecting the quality of precision castings, poor air permeability, and shell deformation, so as to improve the air permeability of the shell and improve the air permeability properties, the effect of enhancing the strength of the shell

Inactive Publication Date: 2018-02-16
NANCHANG HANGKONG UNIVERSITY
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of technology, investment casting can produce larger, more precise, thinner and stronger products, but there is a relationship between strength and air permeability of the investment casting shell, in order to ensure the strength of the precision casting shell , often increase the thickness of the mold shell, resulting in difficulty in heat dissipation, coarse grains, poor air permeability, and difficulty in filling the mold. The pouring temperature of the molten metal must be increased, which intensifies the degree of reaction between the mold shell and the metal, which greatly affects the surface quality of the product. At the same time, the high temperature of the molten metal causes serious deformation of the shell, which affects the quality of precision castings

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A preparation method based on composite fiber reinforced investment casting shell
  • A preparation method based on composite fiber reinforced investment casting shell

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0023] Specific implementation mode one: a kind of preparation method based on composite fiber reinforced investment casting mold shell of this embodiment is carried out according to the following steps, such as figure 1 Shown:

[0024] Step 1, preparation of composite fibers: first put ceramic fibers and nylon fibers with a diameter of 10 μm and a length of 2 mm into ethanol, then put them into an ultrasonic cleaner for cleaning for 15 minutes, and then put them into a hydrochloric acid solution with a concentration of 5 mol / L Soak in water for 25 minutes, then wash with water and dry to complete the preparation of the composite fiber.

[0025] Step 2, surface layer: add alumina powder to silica sol according to the mass ratio of alumina powder to silica sol (2.7:1), stir evenly, and then add the refractory composite fiber prepared in step 1 according to the mass percentage of (5%) is added to it, and it is stirred evenly by a combination of ultrasonic vibration and mechanic...

specific Embodiment approach 2

[0029] Specific implementation mode two: a kind of preparation method based on composite fiber reinforced investment casting mold shell of this embodiment is carried out according to the following steps, such as figure 1 Shown:

[0030]Step 1, preparation of composite fibers: first put ceramic fibers and nylon fibers with a diameter of 6-18 μm and a length of 2-16 mm in ethanol, then put them in an ultrasonic cleaner for 10 minutes, and then put them in a concentration of 0.5 mol / L hydrochloric acid solution for 30 minutes, then washed with water and dried to complete the preparation of composite fibers;

[0031] Step 2, surface layer: according to the mass ratio of corundum powder and silica sol (2:1), add corundum powder into silica sol, stir evenly, and then add the composite fiber prepared in step 1 according to the mass percentage (3% ) into the surface layer slurry, and stir it evenly with a combination of ultrasonic vibration and mechanical stirring (ultrasonic frequen...

specific Embodiment approach 3

[0035] Specific implementation mode three, such as figure 1 shown;

[0036] Step 1, preparation of composite fibers: first put ceramic fibers and nylon fibers with a diameter of 6-18 μm and a length of 2-16 mm in ethanol, then put them in an ultrasonic cleaner for 20 minutes, and then put them in a concentration of 10 mol / L hydrochloric acid solution for 10 minutes, then washed with water and dried to complete the preparation of the composite fiber.

[0037] Step 2, surface layer: add alumina powder to silica sol according to the mass ratio of alumina powder to silica sol (3:1), stir evenly, and then add the refractory composite fiber prepared in step 1 according to the mass percentage of (15%) is added to it, and it is stirred evenly by a combination of ultrasonic vibration and mechanical stirring (ultrasonic frequency: 20kHz~80kHz, mechanical stirring speed: 120r / min~180r / min), forming a surface layer slurry; The wax model is dipped into the surface layer slurry for hangi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
lengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

A preparation method based on composite fiber reinforced investment casting mold shell, which adopts ceramic and nylon composite fiber reinforced investment casting mold shell, which can not only enhance the shell strength and improve the permeability of the mold shell, but also solve the problem of traditional process preparation. The problem of poor air permeability caused by the increase of the thickness of the mold shell in order to ensure its strength; for the production of high-melting-point complex structural integral castings, the micropores formed by nylon organic fibers after the mold shell is calcined can improve the mold shell air permeability, while ceramics The inorganic fibers are retained in the shell to strengthen the shell strength; it solves the problem of the dispersibility of the composite fiber slurry, so that the composite fibers can be well intertwined and evenly dispersed in the slurry, which is conducive to the uniform coating and hanging of the slurry in the shell. The steps are simple and easy to operate; the invention enhances the strength of the mold shell and improves the air permeability of the mold shell on the basis of ensuring a certain wall thickness of the mold shell, thereby laying a good foundation for the metal pouring of the investment casting mold shell.

Description

technical field [0001] The invention relates to the field of special casting, in particular to a method for preparing a precision casting shell based on composite fiber reinforced investment casting. Background technique [0002] Investment casting, as a near-net shape technology of materials, can not only cast parts with very complex shapes, but also cast combined and integral castings. It is often used in the forming of complex aviation, aerospace, and automotive industry heat-resistant components. With the development of technology, investment casting can produce larger, more precise, thinner and stronger products, but there is a relationship between strength and air permeability of the investment casting shell, in order to ensure the strength of the precision casting shell , often increase the thickness of the mold shell, resulting in difficulty in heat dissipation, coarse grains, poor air permeability, and difficulty in filling the mold. The pouring temperature of the m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C7/02
Inventor 芦刚严青松余欢卢百平毛蒲
Owner NANCHANG HANGKONG UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com