(1) The mould meets the requirements of working conditions.

1.Abrasion resistance

When the blank is plastically deformed in the mould cavity, it flows and slides along the surface of the cavity, causing severe friction between the surface of the cavity and the blank, which causes the mould to fail due to wear. Therefore, the wear resistance of the material is one of the most basic and important properties of the mould.

Hardness is the main factor affecting wear resistance. In general, the higher the hardness of the mould parts, the smaller the amount of wear and the better the wear resistance. In addition, abrasion resistance is also related to the type, quantity, form, size and distribution of carbides in the material.

2.Toughness

Most of the working conditions of the mould are very harsh, and some often bear large impact loads, which leads to brittle fracture. In order to prevent the mould parts from being suddenly brittle during work, the mould must have high strength and toughness.

The toughness of the mould mainly depends on the carbon content, grain size and microstructure of the material.

3.Fatigue fracture performance

During the work of the mould, under the long-term effect of cyclic stress, it often causes fatigue fracture. Its forms are small energy multiple impact fatigue fracture, tensile fatigue fracture contact fatigue fracture and bending fatigue fracture.

The fatigue fracture performance of a mould is mainly determined by its strength, toughness, hardness, and the content of inclusions in the material.

4.High temperature performance

When the working temperature of the mould is higher, the hardness and strength will be reduced, leading to early wear of the mould or plastic deformation and failure. Therefore, the mould material should have high resistance to tempering to ensure that the mould has higher hardness and strength at the working temperature.

 

5.Cold and hot fatigue resistance

Some moulds are in the state of repeated heating and cooling during the work process, which causes the surface of the cavity to be stretched and pressure to change the stress, causing surface cracking and peeling, increasing friction, hindering plastic deformation, and reducing dimensional accuracy, which results mould failure. Cold and hot fatigue is one of the main forms of failure of hot work moulds, and this type of mould should have high cold and hot fatigue resistance.

6, corrosion resistance

When some moulds, such as plastic moulds, work, due to the presence of chlorine, fluorine and other elements in the plastic, after heating, they will analyze and analyze strongly erosive gases such as HCI and HF, which will erode the surface of the cavity of the mould, increase its surface roughness, and increase wear and tear.

(二) the mould meets the process performance requirements

The manufacturing of moulds generally requires several processes such as forging, cutting, and heat treatment. In order to ensure the manufacturing quality of the mould and reduce the production cost, its material should have good forgeability, machinability, hardenability, hardenability and grindability; it should also have small oxidation, decarburization sensitivity and quenching Deformation and cracking tendency.

1.Forgeability

It has low resistance to hot forging deformation, good plasticity, wide forging temperature range, low tendency for forging cracking, cold cracking and precipitation of network carbides.

2, annealing processability

The spheroidizing annealing temperature range is wide, the annealing hardness is low, the fluctuation range is small, and the spheroidizing rate is high.

 

3.Machinability

Large amount of cutting, low tool wear and low surface roughness.

4.Sensitivity to oxidation and decarburization

When heated at high temperature, it has good oxidation resistance, slow decarburization speed, is not sensitive to the heating medium, and has a small tendency to generate pits.

5, hardenability

After quenching, it has uniform and high surface hardness.

6, hardenability

After quenching, a deeper hardened layer can be obtained, and it can be hardened with a mild quenching medium.

7, quenching deformation and cracking tendency

The conventional quenching volume changes little, the shape is warped, the distortion is slight, and the tendency of abnormal deformation is low. Conventional quenching has low sensitivity to cracking, and is not sensitive to quenching temperature and workpiece shape.

8.Grindability

The relative loss of the grinding wheel is small, and the maximum grinding amount without grinding is large. It is not sensitive to the quality of the grinding wheel and the cooling conditions, and is not easy to wear and crack.

(三) the mould meets the economic requirements

When selecting the material for the mould, the principle of economy must be considered to reduce the manufacturing cost as much as possible. Therefore, on the premise of satisfying the use performance, first choose the lower price, can use carbon steel without alloy steel, can use domestic materials without imported materials.

In addition, the production and supply of the market should be considered when selecting the materials. The steel types to be selected should be as small and concentrated as possible, and easy to purchase.

 

 

Yuhuan Shengjiu Mould Co., Ltd. is a professional China manufacturer and supplier of    Medical Mould   . The main production and supply: syringe moulds, safety needle moulds, oxygen mask moulds, needle-free injection nozzles, Vaginal Speculum Mould and other medical mould products. And provide customers with a complete mould configuration program to help and improve the production of disposable medical equipment. According to the requirements of the market and customers, Shengjiu Company has developed a new medical mould with a full hot runner system, and has developed various new scientific medical equipment for customers. We have strict quality control throughout the production process of our products, making our products a safe choice for everyone. Welcome to buy: http://www.medicalmould.net/