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Appearance Quality Standard of Silica Sol Castings

Update On Sep 29.2022

With the development of the world's casting industry and the improvement of casting technology, customers have higher and higher requirements for casting factories. The consideration of our customers can be understood by us as an experienced casting factory. We are aware that only those who keep improving themselves could survive in the competitive global market. We Besser Casting have always put our customers in the first place as our business philosophy, and strive to meet the needs of our customers. However, many customers who are not very familiar with castings do not understand the appearance defects of the products, and take it for granted that the casting products should be defect-free. In this article, we mainly talk about the appearance quality judgment standard of the casting blank of the silica sol process.

1. Cold barrier
The reason for the formation of cold barrier is generally the low temperature of molten iron and slow pouring speed, which leads to the condensation of molten steel before the mold shell is fully filled in the small structure of the casting, resulting in casting defects of the small structure. The cold barrier will reduce the strength of the casting, affect the mechanical properties of the casting, and even break the casting in severe cases. Therefore, our silica sol castings absolutely do not allow the cold barrier to exist on the surface of the casting.
Appearance Quality Standard of Silica Sol Castings
2. Cracks
The reason for the formation of cracks is that during the solidification and shrinkage of the casting, the shrinkage is blocked due to the inconsistent cooling rate of each part. When the resistance exceeds the material strength limit, the casting will crack. The hazard of cracks is similar to that of cold insulation, and it also reduces the strength and mechanical properties of the casting. Therefore, we do not accept cracks on the surface of the product.
Appearance Quality Standard of Silica Sol Castings
3. Insufficient pouring
Insufficient pouring of castings is generally due to the complex structure of the castings and the small channels in the membrane shell, which leads to insufficient flow of molten steel in some places. Insufficient pouring seriously affects the appearance of castings, so it is absolutely not allowed to be accepted.
Appearance Quality Standard of Silica Sol Castings
4. Holes 
Holes here include gas holes, sand holes and shrinkage holes. Without affecting the performance of the casting, we are allowed to accept one hole with a diameter of 0.5mm and a depth of 0.5mm within the range of Φ50mm, while casting with more than one hole is deemed unqualified.

Appearance Quality Standard of Silica Sol Castings
5. Succulents 
Succulents are mainly manifested as iron beans, flashes and bulges on the surface of castings. Succulents generally do not affect the strength of the castings, but flashes and bulges are not allowed on the surface of our silica sol castings. Without affecting the assembly performance of the castings, we are allowed to accept 1 iron bean with a diameter of 0.5mm and a height of 0.5mm within the range of Φ50mm, and casting with more than 1 iron bean is deemed to be unqualified.
Appearance Quality Standard of Silica Sol Castings
6. Bumps
In the process of casting shot blasting or transportation in the factory, the product and the product collide with each other to cause slight bumps. Without affecting the assembly performance of the casting, we are allowed to accept bumps within the range of Φ50mm with a length of 1mm, a width of 0.5mm, and a depth of 0.5mm.
Appearance Quality Standard of Silica Sol Castings
The defects above can be summarized as follows:

Ningbo Besser Power Technology Co., Ltd.

Standard of Casting Appearance Quality

Defect

Level

A

B

C

Cold Barrier

Not allowed

Not allowed

Not allowed

Crack

Not allowed

Not allowed

Not allowed

Holes

Gas Hole

 Within the range of Φ100mm, one gas hole with Φ0.5mm and the depth within 0.5mm is allowed

 Within the range of Φ50mm, one gas hole with Φ0.5mm and a depth of 0.5mm or less is allowed

Within the range of Φ50mm, 3 gas holes of Φ0.5mm and the depth within 0.5mm are allowed

Sand Hole

Within the range of Φ100mm, one sand hole with Φ0.5mm and a depth of 0.5mm or less is allowed

 Within the range of Φ50mm, one sand hole with Φ0.5mm and a depth of 0.5mm or less is allowed

Within the range of Φ50mm, 3 sand holes with Φ0.5mm and the depth within 0.5mm are allowed

Shrinkage Hole

Within the range of Φ100mm, one shrinkage hole with Φ0.5mm and a depth of 0.5mm or less is allowed

 Within the range of Φ50mm, one shrinkage hole with Φ0.5mm and a depth of 0.5mm or less is allowed

Within the range of Φ50mm, three shrinkage holes with Φ0.5mm and a depth of 0.5mm or less are allowed

Succulents

Flash

Not allowed

Not allowed

Acceptable without affecting the assembly

Bulge

Not allowed

Not allowed

Acceptable without affecting the assembly

Iron bean

Within the range of Φ100mm, 1 iron bean with Φ0.5mm and height within 0.5mm is allowed

Within the range of Φ50mm, 1 iron bean with Φ0.5mm and height within 0.5mm is allowed

Within the range of Φ50mm, 3 iron beans with Φ0.5mm and height within 0.5mm are allowed

Bump

Not allowed

Within the range of Φ50mm, it is allowed to accept bumps with a length of 1mm, a width of 0.5mm, and a depth of 0.5mm or less

Acceptable without affecting the assembly

Our silica sol castings generally adopt B-level standards. During the inspection process, if a defect exceeds the B-level accuracy requirements, we will judge it as unqualified.


Of course, the standard is inflexible. We Besser Casting can also develop multiple and flexible casting solutions that meet customer requirements for customers to choose from according to their different needs.


Casting is complicated. Working in casting industry, we almost spend every day in solving casting quality problems and preventing casting quality problems. Fortunately, we Besser Casting have a professional team dedicated to casting defects, and we strictly follow the standards in the management and control of casting quality problems. We have a dream to grow together with the company, to be fully equipped and supported, to be acknowledged and appreciated by customers.

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