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What kind of steel is good for bottle cap mould

2020-02-01

Beverage bottle cap mold material

  • 1. Longji standard mold base is selected.
  • 2. 2316 is a German corrosion-resistant steel.
  • 3. The advanced design of the top nozzle enables the automatic production of the die without the need for manual supervision.
  • 4. Reasonable and ingenious waterway design can shorten the molding cycle of products to less than 12 seconds.
  • 5. The professional computer software calculates the connection belt, the opening and closing cover's elasticity is very big.
Die materials p20718718h, 27382316, S136 are available for you to choose. Die base: 45 ＃ pre hardening & gt; 30 HRC cooling system optimized design of circulating water, improve production efficiency, reduce your cost, medium-term treatment and tempering, and improve hardness. After treatment nitriding (nitriding treatment temperature is low, deformation is very small, so it has high surface hardness (greater than HV850) and wear resistance without quenching) die life P20 normal use is not less than 300000 die times
cap mould steel

Selection principle of mould material for bottle cap

  • 1. Wear resistance
When the blank is plastic in the mold cavity, it flows and slides along the surface of the mold cavity, causing severe friction between the surface of the mold cavity and the blank, which leads to the failure of the mold due to wear. So the wear resistance of the material is one of the most basic and important properties of the mold.
Hardness is the main factor affecting the wear resistance. Generally, the higher the hardness of die parts, the smaller the wear amount and the better the wear resistance. In addition, the wear resistance is also related to the type, quantity, shape, size and distribution of carbide in the material.
  • 2. Strong toughness
Most of the working conditions of dies are very bad, some of them often bear large impact load, which leads to brittle fracture. In order to prevent the die parts from brittle fracture, the die should have high strength and toughness.
The toughness of die mainly depends on carbon content, grain size and microstructure.
  • 3. Fatigue fracture properties
In the process of die working, under the long-term action of cyclic stress, it often leads to 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 the die mainly depends on its strength, toughness, hardness and the content of inclusions in the material.
  • 4. High temperature performance
When the working temperature of the die is higher, the hardness and strength will decrease, which will lead to early wear or plastic deformation of the die and failure. Therefore, the die material should have high tempering stability to ensure that the die has high hardness and strength at working temperature.
  • 5. Cold and hot fatigue resistance
Some dies are in the state of repeated heating and cooling in the working process, which makes the surface of the cavity subject to tensile and pressure stress, causes surface cracking and peeling, increases friction, hinders plastic deformation, reduces dimensional accuracy, and leads to die failure. Cold and hot fatigue is one of the main failure modes of hot working dies, which should have high cold and hot fatigue resistance.
  • 6. Corrosion resistance
Some molds, such as plastic molds, because of the presence of chlorine, fluorine and other elements in the plastic, decompose and precipitate strong corrosive gases such as HCI and HF after being heated, which erode the surface of mold cavity, increase its surface roughness, and intensify wear failure.

Surface treatment technology of mould steel - bottle cap mould

Surface treatment technology of cap mould steel

In addition to the reasonable fit of matrix with enough high strength and toughness, the surface performance of steel mold is very important to the working performance and service life of steel mold. These surface properties refer to: wear resistance, corrosion resistance, friction coefficient, fatigue performance, etc. The improvement of these properties is very limited and uneconomical only depending on the improvement and improvement of the matrix material, and the surface treatment technology can often get twice the result with half the effort, which is the reason why the surface treatment technology has developed rapidly.
The surface treatment technology of steel mould is a system engineering which changes the shape, chemical composition, structure and stress state of steel mould surface through surface coating, surface modification or composite treatment technology to obtain the required surface performance. From the way of surface treatment, it can be divided into chemical method, physical method, physical chemical method and mechanical method. Although new treatment technologies aiming at improving the surface properties of steel die are emerging, the main nitriding, carburizing and hardening film deposition are widely used in steel die manufacturing.
Nitriding process includes gas nitriding, ion nitriding and liquid nitriding. In each nitriding mode, there are several nitriding technologies, which can meet the requirements of different steel grades and different workpieces. Because the nitriding technology can form the surface with excellent performance, and the nitriding process and the quenching process of die steel have good coordination. At the same time, the low nitriding temperature does not require intense cooling after nitriding, and the deformation of steel die is very small, so the surface strengthening of die is the earliest and most widely used nitriding technology.
The purpose of carburizing steel mold is to improve the overall strength and toughness of steel mold, that is, the working surface of steel mold has high strength and wear resistance. The technical idea is to replace the higher grade material with the lower grade material, i.e. through carburizing and quenching, so as to reduce the manufacturing cost.
At present, CVD and PVD are the mature deposition technologies. In order to increase the bonding strength of the film surface, a variety of enhanced CVD and PVI technologies have been developed. Hardening film deposition technology was first applied in tools (tools, cutting tools, measuring tools, etc.) with excellent results. Many tools have used coating hardening film as a standard process. Since 1980s, the technology of coating hardening film has been used in the mould. Under the current technical conditions,
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