High precision casting tolerance. Casting tolerance grade is VDG P690 D1 class which means small maching allowance or no maching.

Good Casting surface; the casting surface can be Ra 1.6-3.2um.

It suit for many kinds of material and difficult parts, such as stainless steel, carbon steel alloy steel.

1. In order to get a smooth transition of different parts of castings, prevent sharp transition of different wall thicknesses, and reduce slag, iron beans and bubbles formed by eddy current at sharp corners, especially to prevent defects such as cracks in castings caused by shell overheating. We need to set a R at the intersection of parallel or intersecting walls

2. We need to set a proper R because too big or too small also cause defects on parts of  casting. Generally the R is according to the two walls thickness. If we Suppose two wall thickness are A and B, the R should be 1/3 -1/5 （A+B）.

1. Our factory have in this area about 10 years, and  Products involved many fields. Such as Auto parts, Marine hardware, construction hardware, and so on.

2. With ISO9000 Certification and T16949 System Certification.

3. With 1000T capacity a year and adequate machining ability, which helps us meet the quick demand.

                                                                            The difference between medium temperature wax and low temperature wax in lost wax casting

  In fact, the terms "medium temperature wax" and "low-temperature wax" belong to an early term for mold materials. Although many people still use this term today, strictly speaking, they should be called "medium temperature mold materials" and "low-temperature mold materials".

  With the rapid development of science and technology and industrial production, the application scope of investment casting technology is constantly expanding. Wax materials are difficult to synchronize in terms of performance and quantity compared to the rapidly developing investment casting industry. So various organic compounds, plastics, and inorganic salts were successively adopted. Some are added as fillers to the wax material, while others directly replace the wax material for mold making. Therefore, wax molds and wax materials are gradually being replaced by mold materials and investment molds. However, under normal circumstances, people still habitually refer to it as a "wax mold". However, this "wax model" is no longer the same as that "wax model".

  Due to the variety of mold materials and their different compositions, classification is also quite complex. There are two recognized classification methods:

  The first classification method is based on the thermal stability of the mold material. Thermal stability is an important performance of the mold material, which is closely related to its melting point. Generally speaking, the higher the melting point of the mold material, the higher its thermal stability; On the contrary, the lower the melting point, the lower its thermal stability. So, according to the melting point of the mold material, it can be divided into three categories: high melting point mold material, medium melting point mold material, and low melting point mold material. If considered from the perspective of thermal stability, it can be divided into high-temperature mold materials, medium temperature mold materials, and low-temperature mold materials.

  Therefore, what we usually refer to as low-temperature wax and high-temperature wax are clearly distinguished by the thermal stability of the mold or wax material. This is the first point.

  The second classification method is determined based on the composition of the matrix material of the mold material. According to the development of modern mold materials, they can be divided into wax based mold materials, rosin based mold materials, plastic mold materials, water-soluble mold materials, and filling mold materials.

The above classification method is based on the classification method of Wang Leyi's "Investment Casting Technology". The first classification method seems to be basically consistent in the information presented. However, the latter classification method varies from person to person: some online materials are divided into four categories: wax based molds, resin based molds, filler molds, and water-soluble molds; The "Practical Investment Casting Technology" edited by Jiang Buju is divided into non filler mold materials (wax based mold materials, resin based mold materials), filler mold materials, and water-soluble mold materials, which are basically consistent with the above classification; The following classification method comes from the "Practical Technology of Precision Casting" by Yamaya Yokota.

  Classification method of mold materials

In fact, no matter how the mold materials are divided, they never deviate from their roots. Basically, they are all similar. However, modern times have added a new type of mold material for rapid prototyping, which is a newly added type of mold material.

  Below, we will further elaborate on the centralized mold material of the first classification method.

  1. Low temperature mold material. The melting point of low-temperature mold materials is generally below 70 ℃, with low strength, poor thermal stability (30 ℃), large shrinkage, significant changes in mold size and shape with room temperature, and rough surface roughness. The mold material composed of 50% paraffin wax and 50% stearic acid commonly used in China is a typical example of this type of mold material. However, the production process of this type of mold material is simple, the mold material recovery rate is high, it can be reused, and the cost is relatively low. General paste pressing, manual operation, can be dewaxed with hot water. This type of mold material is usually used together with water glass adhesive.

2. Medium temperature mold material. Mainly composed of rosin wax based mold materials and filling mold materials, with a melting point between 70-100 ℃, high strength, good thermal stability (35 ℃), small shrinkage, good dimensional stability, and fine surface roughness and good replication performance when pressed in liquid state. Can be reused, with complex production processes and high costs. It can be dewaxed with water, steam or microwave. This type of mold material is usually used together with silica sol binder. Generally, wax injection machines are used for production.

3. High temperature mold material. Mainly rosin plastic based, plastic based, and salt based molding materials, with a melting point greater than 100 ℃. This molding material has high strength, good thermal stability, and small shrinkage, but the production process is complex and cannot be reused. Generally, flash firing method, water or organic solvents are used for removal. High cost. It is obvious that water-soluble mold materials and 3D printing mold materials belong to this category of mold materials. In the field of investment casting technology, high-temperature mold materials are described as follows: this type of mold material has a large amount of thermal expansion, and during demolding, the shell often fractures due to insufficient strength.