How to Select a Suitable Mold Steel for the Injection Moulds

Different mold steel has different performance, so different injection moulds use different steel. The question is how to select the suitable steel for the injection moulds?

Mold steel is divided into cold die steel , hot die steel, and plastic mold steel, be used to forging, punching, cutting, die-casting, etc.

For some import pre-harden mold steel, such like DIN1.2311, DIN1.2738, NAK80. The steel factory hardness can reach HRC32-40. They have high polish performance, deformation resistance, and pressure resistance. They widely used to table mould, large box mould, auto part mould, etc.

Domestic pre-harden steel, SC45#, SC50#, SC60#, P20, 718, P20H, 718H. The factory hardness is HRC32-37. They can beuse directly, and also can be make harden treatment if there has more hardness requirement. Such like nitridation, heat treatment.

However, there are some moldsteel that don’t have any hardness when the injection mould smaker got it. Import steel, DIN1.2344, DIN1.2316, H13, S136, S420, andmold steel made in China, 2316, S136, H13, 3Cr13, 4 Cr13, etc, they all need to quenching or nitriding to reach the necessary hardness after rough machining. The steels are stainless, suitable for rubber injection moulds that need corrosion resistance.

According to our mould manufacturing experience, most packaging mould, such like preform mould, cap mould, thin wall container mold, syringe molds, cutlery mold, PVC mold, etc. They                                                                        are normally made by high quality mould steel, S136, DIN1.2316. The similar feature of this mould is that they all have high output requirement, and stainless steel.These steel can guarantee a longer mould life than other general steel.

DIN1.2738, 718H, H13 is widely use for home appliance mold, commodity mold, auto part mold. For example, battery box mold, helmet mold, bucket molds, thick container mold, etc.

For some large mold, such like industry use bin mould, pallet mold, panel mold, multi crate mold, table mold, chair mould, bumper mould, etc. Because the most mould cost is on the steel, so customers will select P20 for the mould core and cavity. Besides, they easy machining than harder steel.

SC 45# is normally use for injection moulds base. Sometimes, it also use for some large mould core and cavity when customer doesn’t has longer mould lifer requirement.

When you are select the mold steel for your injection moulds, we kindly suggest you that, it is not the harder the better, or the expensive the better. You need to select a suitable mold steel for the injection moulds.

Sino Mould: A Leading Plastic Injection Tools Supplier in China

As we know, the plastic mould is called the mother of plastic products. All manufacturers produce the plastic products depend on plastic molds. So the competition in plastic molds filed has daily increased, if you are a plastic products manufacture, you must give up the old traditional ways to buy the exisiting product, you need a fresh product with your own idea. That’s means you need custom plastic molds. How to find a good custom plastic molds maker? This issue always puzzled many plastic products manufacture.

Sino mould is the leading plastic injection tools supplier in China. Due to our high quality injection tools, custom plastic molds, professional plastic molding service, Sino mould wins our customers’ trust and praise all over the world.

Why our Sino mould can soon become the leading injection tools supplier in China?

1. We accumulate 20 years experience in plastic mold design and manufacturing. And we can produce wide range of plastic injection molds.

2. We import many international advanced tooling machines. Such as CNC milling machine, Sodick precision EDM machine, wire cutting, etc.

3. We provide high quality moulds, timely delivery time, best after sales service and reasonable price for the worldwide customers.

4. We have our own R&D department to offer custom design for both product and mould design, to help customer save the designer cost.

5. We have mature quality management system to control the mould quality. And we established the project department to take charge for the order, from order confirmation to shipment. We will report the order status periodically.

6. We offer customers best after-sales service. After the mould shipped, the mold comes some problems in customers’ factory, when customer show us what’s the problem on mold, we will offer customer best way to solve the problem and we also can send engineer to customer’s factory if needed.

7. We offer customer not only a plastic mould or a custom mould, but a turnkey solution. And together with our Dakumar Machinery we have the ability to offer you factory building service.

As the leading injection Tools Supplier in China, We offer not only a custom mould but a custom solution. We have offered many custom solutions to our customers all over the world. Here I want to show you a water bottle production line case.

The custom solution manufacturer：SINO HOLDINGS GROUP

Client：XX ，

Country: XX ,

Project: build a water bottle factory, water bottle production line

Product: 500ml /1L/1.5L/2L water bottle

The plan of this project:

1. The plastic mould:

500ml /1L/1.5L/2L PET preform mould, plastic bottle mould, plastic cap mould, the mould cavities according to the product output.

2. The plastic injection molding machine: PET injection molding machine, bottle blowing machine.

3. The plastic injection related auxiliary machine: auto loader, water chiller, dehumidifying, drying and feeding machine, air compressor.

…

If you want to know more about our custom solution, don’t hesitate to contact us. Our high quality custom plastic molds are waiting for you.

Some Guidelines to Follow for the Disassembly of Plastic Injection Mould

If you demand long-life plastic injection moulds, it is insufficient if you only requires good mould from mold supplier; the life of the mold have great relationship with normal operation and maintenance, so a mature molding company usually have plastic mold engineer, who will responsible for mould repairing and maintenance; of course, plastic molds disassembly is a basic work in mold maintenance.

Do you know how to disassemble plastic molds? And what you should pay attention in moulds disassembly? When you disassemble theplastic moulds, you need to pay attention to following matters.

·         It is necessary to print the mould assembly drawings, clear up each of the parts in the plastic molds and the principle of operation as well as the assembly relationships.

·         According to the parts list on the assembly drawing, preparing the necessary disassembly tools.

·         Analysis the plastic injection moulds, learn the injection type, such as normal hot runner, valve gate or cold runner, and check the parting line and ejector system. Make a disassembly order list before do it.

·         When you disassemble the plastic molds, placing the mould on rubber mat or low hardness plane workbench. Parting surface to be parallel with the table; that means guide pin should perpendicular to the workbench. It can protect the mould parts, such as ejector pin, if the mould is not in correct direction, small pin will be easy to be bend.

·         Usually, you need to separated the cavity and core, and disassemble plastic injection moulds from back side, it means start disassembling from the ejection and injection systems.

·         If you don’t know about the mould well, you need to mark all the removed parts, and put in sequential, it will be convenient for installation and it can avoid mistake when you assembling the mould.

·         Tools to be used correctly make the force balance when you rotating or beating, don’t forcibly disassemble the undetectable parts.

·         If the tool needs to reach to cavity or core surface, be sure to use less hardness tool than the core cavity, usually, we suggest copper.

If you don’t have any mould engineer in your company, it is not rational to do plastic molds disassembly without any technical support. We suggest you send plastic injection moulds to local mould workshop, or do the plastic molds disassembly under guidance of mould manufacture.

A Brief Description on How to Custom Mould Efficiently and Successfully

If you want to get a good custom mold, many inexperienced customers normally like to find some professional mould manufacturers. But even if you find a good mould maker, you can’t express your needs well or you can’t have a good communication with the company, that’s also can cause bad results. So custom mould is also need some skills.

How to custom mold successfully? What’s problems will appear when custom mould? In custom mould process, which content must be discussed clearly? 

We will offer you a chair mould case to explain how to custom a good chair molds successfully, and what’s problems we can avoid on custom mold project.

Product:

If you want to custom a good mould, firstly, we need to know the product clearly. Such like whether the mould design is reasonable, whether the product on market can bring the profits, etc. How to save cost on the same product, for example, we can make the mould size smaller, use a smaller machine to manufacturing or the mould can use hot runner system to reduce the material cost and shorten the cycle time, etc. For plastic chair, the most important except the style, we also need to consider the chair strength, stacking condition, flash and the design is reasonable or not.

Mould design

Mold design rationality, will bring us great return benefit. Many times, we are wasting money on the mould because of the lack experience. 

The below information is the key point that we need to treat very seriously:

1.      Mould structure the simple the better

Because, for the simple mould, there will be less rub during the mould operation, then the mould life will be longer. When take chair mold as an example, some customers think the more interchangeable back inserts the better, and it will be excellent if all the chair back inserts and sit inserts can be interchangeable. However, that will make mould testing very complicated, and you will have a lot of trouble in your future mass production.

2.      High requirements for cooling system

High quality cooling system design can help you a lot on shorten the cycle time that obviously brings directly benefit and effective to the customer. Simpler and better than you hire a wise operating engineer.

3. The injection gate chooses!

Sometimes it will cause many problems from ignoring the injection forming on design, it is not good if only considered about the surface while not the mould. As we know if the mould with hot runner system, it without the waste material and improve the injection cycle time, but in order to reduce the cost that we will use the recycle material, while it with much impurity is not good for the hot runner. For chair mould, if adopt the famous brand such as YUDO, it’s a waste of the cost. If adopt the common hot runner system, they may not solve the problem, so even if they used the filter, also can not ensure the quality is 100%. In this way, we can choose the cold runner system, if design well for the injection gate location, it is easy to break off the tail and not leave the marks.

Machine selection

To custom mold is not only related to injection molds, actually injection molding machine selection is also a key point of a customized mould.

If you have enough budgets, please consider to choose a greater tonnage machine. A great tonnage machine will have stronger clamping force, it is very easy to solve the flash problem. If you are not able to choose a big machine, definitely you may face a lot of problem during long term manufacturing.

In order to avoid such problems happen, customer have to provide the mould making company detailed machine parameters.

This is our decades experience for clients’ customize mould, if you have more experience and better suggestion please contact us for exchange ideas and mutual-improvement. Sino Mould Co., Ltd one of the biggest mould company and a professional mold custom factory.