一, What is mold surface treatment
Surface treatment of injection moulds usually involves a set of steps that use physical or chemical methods to make the surfaces of moulded items stronger or change their qualities. The goal is not to change the mold's main structure, but to make its surface work better.
Some common purposes for surface treatment are to make the surface more resistant to wear and corrosion, to make demolding easier, to make the surface smoother, and to make the mould last longer. Surface treatment is mostly used on parts like cavities, cores, gates, and sliders that touch or rub on plastic melt a lot.
二,Is it necessary to handle
For moulds that are simple, have little output, and use mild plastic materials, like small-scale trial production moulds or low-end product moulds, the mould steel itself might sometimes be enough to suit the needs of the user.
But in the following cases, surface treatment is usually strongly suggested for injection moulds:Fibreglass and mineral fillers are examples of high-wear components that are found in plastic polymers.
三,The role of surface treatment
the wear resistance gets better. The mould cavity comes into touch with the plastic melt several times throughout the long-term injection moulding process. This is especially true for plastic that contains glass fibres, which will wear down the mould surface a lot. Surface treatment can greatly lower the rate of wear and extend the period between maintenance checks on mould accuracy. it is more resistant to corrosion. Some plastics give off corrosive gases when they are injected at high temperatures, which can cause the mould surface to rust or corrode over time. By treating the surface correctly
四,Common handling methods
Polishing is the simplest and most popular way to process a mould. It is generally used to make the mould cavity smoother and to make goods that look good. Most of the time, high-gloss moulds need to be polished several times.
Nitriding treatment makes the mould more resistant to wear and fatigue by adding a strong nitride coating to the surface. This makes it good for moulds that will be used for medium to high production.
Coating treatment is the process of putting a functional coating on the mold's surface. This makes the mould harder, more resistant to wear, and more slippery at the same time. People generally use it for moulds that are high-end or for particular uses.
五,Different mould needs
Moulds for appearance frequently need very smooth surfaces, and the quality of polishing directly influences how the product looks. So, extra attention is devoted to how smooth the surface is and how to polish it.
Engineering structural component moulds are primarily concerned with wear resistance and dimensional stability. To make the moulds last longer, they are generally treated with nitriding or coating.
During the design phase, high-yield moulds frequently think about surface treatment plans at the same time. This is to make sure that the mould works well over time in long-term continuous production.
六,The effect on the quality of the mould
The quality of injection moulding is directly affected by the mold's surface condition. Too much roughness on the surface can easily cause faults, scratches, or mould adhering; not enough performance on the surface can cause the product to wear out quickly when exposed to high temperatures and pressures
A good surface treatment can make the flow of melted plastic in the mould cavity smoother, cut down on defects like flow marks and weld lines, make the demolding process easier, and lower ejection resistance.Surface treatment of moulds not only influences how they look, but it also affects how well they hold their shape over time for high-precision goods.
七, How it affects the lives of moulds
Mould life is one of the most essential things to look at when judging how well an injection mould works as a whole. Surface treatment has a direct effect on mould life.
Moulds that aren't treated or processed correctly are likely to wear out, rust, peel, and have other difficulties over time. This means that they need to be repaired often and may even need to be thrown out early.
By treating the surface in a fair way, the wear rate can be greatly slowed down, and the need for maintenance can be decreased. In terms of total cost, it is typically cheaper than fixing mould all the time.
八, Cost and how well it works for the money
When deciding whether or not to have surface treatment, many clients are mostly worried about the expense. Surface treatment does make mould manufacture a little more expensive, but in the long run, it is typically highly cost-effective.
In mass production, surface treatment often pays for itself several times over by extending the life of the product, making it more stable, and lowering the number of defects.
