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

Casting core making material and core making method

A technology of core material and core bone, which is applied in the field of casting core materials, can solve problems such as high cost of modeling, mold clamping and grinding, difficulty in cleaning and grinding, and increased production hours, so as to reduce cleaning and grinding hours, save storage and Maintenance operation, the effect of improving product qualification rate

Inactive Publication Date: 2019-09-20
NINGBO YONGXIANG CASTING
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the process of casting oil cylinder parts, in order to ensure the stability of the casting quality, the forming chill iron is chosen to be placed in the core making process, which makes it difficult to clean and polish, and greatly increases the difficulty of modeling
[0003] The traditional casting method uses forming direct chill iron, there are many influencing factors, it is not easy to control, and the defects cannot be completely eliminated
For example, when the outer contour of the casting is arc surface or curved surface, it is not easy to detect and find defects by ultrasonic (UT) flaw detection. The defects are exposed during final processing, making the parts unusable and scrapped, resulting in increased costs and long production cycles, which will seriously affect Agreement delivery date
[0004] In addition, the following problems still exist in the use of forming cold iron: 1. It is necessary to make cold iron molds, which increases the production man-hours; 2. The cost of the shape, mold closing, pouring, unpacking, and polishing of the cold iron itself is relatively high; 3. Preservation and molding Chilling iron requires a lot of manpower and space; 4. There must be gaps between the forming chilling irons, which may cause the sand to be not tightly packed and the strength of the sand mold to be low, resulting in defects in the casting; 5. Difficulty placing the chilling iron during molding 6. Due to grinding and deformation of the forming cold iron, the fit with the mold is not tight, resulting in excess or lack of material in the casting

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
  • Casting core making material and core making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The weight percentage composition of the foundry core material of embodiment 1 comprises: steel shot 60%, carbon particle 20%, in the present embodiment, take sawdust as carbon particle, the balance is silica sand, and wherein, the particle diameter of steel shot is 0.5~1.5 mm, the particle size of carbon particles <1.0 mm. The steel shot is recovered from the waste steel shot produced by the shot blasting machine, and the iron content of the waste steel shot is 92%, and the silica sand is recovered from the old sand produced by the shot blasting machine.

Embodiment 2

[0029] The weight percentage composition of the foundry core material of embodiment 2 comprises: steel shot 55%, carbon grain 25%, in the present embodiment, take carbon block particle as carbon grain, surplus is silica sand, and wherein, the particle diameter of steel shot is 0.5% ~1.5 mm, the particle size of carbon particles <1.0mm. The steel shot is recovered from the waste steel shot produced by the shot blasting machine. The iron content of the waste steel shot is 95%, and the weight of the 20-30 mesh steel shot in the waste steel shot is 55-65%; the silica sand recovery Old sand produced after shot blasting by shot blasting machine.

Embodiment 3

[0030] Embodiment 3, the core making method using the foundry core making material of embodiment 1 as raw material, comprises the following steps:

[0031] (1) Mix the raw materials of the core-making material evenly and add them to the sand mixer. After stirring well, add alkaline phenolic resin as an adhesive. The volume ratio of the added alkaline phenolic resin to the core-making material is 1.0: 20. Stir fully again to obtain the prepared iron sand;

[0032] (2) Place the core bone in the core box, and the side wall of the core bone is pre-opened with multiple vent holes with a diameter > 10 mm. According to the shape of the casting, fill the prepared iron sand around the core bone and tamp it. The thickness of the iron sand filled between the outer surface of the bone and the inner surface of the core box is 35 mm;

[0033] (3) Continuous input of CO to multiple exhaust holes through the transmission conduit 2 Air for 10 minutes to harden the filled iron sand to obtain...

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
particle diameteraaaaaaaaaa
thicknessaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a casting core making material. The casting core making material comprises, by weight percentage, 55%-65% of steel shots, 15%-25% of carbon granules and the balance silica sand. The particle size of each steel shot ranges from 0.5 mm to 1.5 mm, and the granule size of each carbon granule is smaller than 1.0 mm. The casting core making material can be used instead of conventional formed direct or indirect chill iron, the casting defects such as shrinkage cavities and shrinkage porosity of castings are effectively overcome, the molding difficulty is reduced, the cleaning and polishing labor time of the castings is shortened, the production efficiency of the castings is obviously improved, and the product quality of the castings is guaranteed. The casting core making material is particularly suitable for the castings with the high quality requirements and the regions where the chill iron is difficult to place or clean, such as pressure vessel or oil cylinder parts with guide pillar holes and the castings with long and thin holes formed in the side walls, the number of the casting defects is effectively reduced, or the casting defects are effectively overcome, and the product percent of pass is improved. The compressive strength of a sand core which is obtained according to a core making method is 2.9 MPa or above, and the pouring requirements of the castings are completely met.

Description

technical field [0001] The invention relates to the technical field of casting core making materials, in particular to a casting core making material and a core making method. Background technique [0002] During the production process of castings, shrinkage porosity and shrinkage cavities of castings are often encountered, especially some pressure vessels or oil cylinder parts near the middle hole and side walls are prone to shrinkage porosity and shrinkage cavity defects. Especially in the process of casting oil cylinder parts, in order to ensure the stability of the casting quality, the forming cold iron is chosen to be placed in the core making process, which makes cleaning and grinding difficult, and greatly increases the difficulty of modeling. [0003] The traditional casting method uses forming direct chill iron, which has many influencing factors, is difficult to control, and cannot completely eliminate defects. For example, when the outer contour of the casting is...

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 Applications(China)
IPC IPC(8): B22C1/00B22C9/10B22D15/00
CPCB22C1/00B22C9/10B22D15/00
Inventor 李冠昕杨天祥陈晓群许立玉施闵雄何金鹏丁成才马俊杰
Owner NINGBO YONGXIANG CASTING
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