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Mould steel

How to evaluate the right material and design for prototype molds

Making prototype molds is as much an art as it is a science and there are a range of feasible mold types that can be utilized in order to develop prototype parts. A few of the typical variants include the following:MUD (Master Unit Die) Molds:This type of mold includes a standard injection molding frame that utilizes a number of inserts in order to define the shape of the internal cavity (and thus the eventual part). MUD inserts can be manufactured via CNC machine or an Electric Discharge Machine (EDM) depending on the material requirements of the mold inserts themselves. If you are injection molding with a plastic that has a very high molding temperature, if you are executing an unusually high number of cycles, or if you are working with parts that have very complicated or fine surfaces, you may need to use inserts with more robust material properties. Depending on the material required, CNC machines may not be able to make the required cuts. An EDM machine can typically accomplish the cuts when a CNC machine is not sufficient.Advantages: The large upside to using Master Unit Die Molds is that it lowers total cost and turnaround time for prototype revisions. The inserts can be easily removed, redesigned, and re-inserted while leaving the larger part of the tool in the injection mold machine. For this reason, if there is a requirement for significant debugging and/or adjustment to the injection molded part then the MUD inserts are a great option.Disadvantages: There are disadvantages to using injection molding as a methodology for rapid prototype revisions in general. Note that such a statement is not really a criticism of MUD Molds per say but rather an endorsement (in those cases where it is possible) to rapid prototype via iterative 3D printing and/or CNC machine cuts. Once such a course of action has been taken, however, it may still make sense to prototype test the injection molding process itself as there are always unexpected eventualities that perhaps were not discovered in, for example, 3D printing.Notes: The use of “slides” or “cams” is not unusual if the part design includes an undercut that requires molding. Slides and cams are moving parts within the mold that allow or restrict access to particular areas within the tooling (and thus facilitate the desired shape of the part). The use of slides or cams can facilitate ejection of certain areas of plastic that might otherwise be trapped in the tooling.Aluminum Mold Tooling:Solid aluminum tooling is often a final deliverable for a project. In other cases, aluminum tools are designed such that potential changes can still be made during the development process (e.g. if prototype iterations are to be made during injection molding). In general, aluminum tools are easier to machine than steel tooling and so iterative design changes are typically less burdensome.Advantages: Aluminum is a very strong conductor of heat (it heats up and cools down very quickly). The fact that it cools down so quickly is what makes it particularly useful for injection molding (a cyclical process). Quicker cooling generally means more cycles in a given amount of time and therefore, faster production. Note: Production time isn’t typically the highest priority when prototyping parts so this may or may not be a relevant issue. In any case, it is good to understand and may help to inform decisions when it comes to full scale injection molded manufacturing.Another advantage of aluminum tooling is that it could potentially improve the flow of material through the mold. Better flow properties can be a significant advantage because you are decreasing the risk of defective parts that ultimately cost you money. Many injection molding defects can be avoided by working with experienced engineers that utilize moldflow software like Solidworks Plastics (read more here). You can read about the ten most common injection molding defects here. Additionally, here is a quick video of an injection mold cycle where the molten plastic is flowing from the gate (point of entry) through the entire part.Disadvantages: Aluminum tooling cannot replicate certain prototypes perfectly - particularly those requiring special finishes. You cannot polish aluminum as well as steel, so if really high-gloss surfaces are required, steel is usually a better choice. Note, you can still get a really good polish on aluminum, just not as good as steel. Additionally of note, polished finishes are typically not the focus during prototype processes. If this is not an important consideration for this phase then aluminum is not necessarily a poor choice. That said, the ability to produce a finished surface directly from the mold is something to consider when moving towards production and the selection of a production tool.A second disadvantage to aluminum tooling is that it is less robust than a steel tool. Although a good aluminum tool can produce from one hundred to even one hundred thousand parts without degradation, when comparing apples-to-apples, steel is typically much more robust. The lifespan of an aluminum tool depends on the molding temperature, the number of cycles, and the intricacies of the part itself. An additional consideration with aluminum is the particular alloy being used. Some of the aluminum alloys in the 7000 series, for example Aluminum 7075-T6, are very robust - and are even comparable to steel in some material properties.Steel Mold Tooling:Steel tools are typically used for full scale production (high volume manufacturing) rather than as a prototyping mold. They are generally considered an upgrade over MUD or aluminum tooling. When working on a steel tool the designer is typically focusing on production issues rather than part design. Large concerns might include mold flow properties, gate location, location and number of vents for trapped air, cycle time, and the material properties of the particular plastic being used.Advantages: Steel molds have very long lifespans and it is for this reason that they are most often used in production. While steel is less thermally conductive than aluminum, it is much more robust as a general rule. Typical injection mold temperatures, even with short cycle time, will not have an adverse affect on the tool itself.  Disadvantages: Steel tools are typically extremely complex and precise. They are either used for production or are one step away from it and so the tolerance for errors is very small. Mistakes in production are very costly and so it is incumbent on the design and development team to get everything exactly right in the pre-production iterative process.Conclusion:There are a vast number of considerations to mull over when evaluating the right material and design for prototype molds. Three common options are the Master Unit Die (MUD), aluminum tooling, and steel tooling. Each have their advantages with regard to cost, efficiency, quality, rapid prototype capability, iterative design capability, scale, and finishing requirements. We evaluate each project for the correct combination of quality, price, and suitable use. If you have questions please don’t hesitate to contact our team for their expertise.

What’s ejector sleeves?

The function of an ejector sleeve is similar to that of an ejector blade,in that both are typically used to push on a vertical section of the molded part.The design of the ejector sleeve varies significantly,however,since it is a hollow cylinder that slides along a fixed core pin to provide an ejection force at the bottom surface of a plastic injection molded boss.Ejector sleeves are very effective components for part ejection,since they push on a stiff portion of the part at a location where friction forces between the molding and the core occur.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to facilitate mold usage

Molding machine operations should be able to operate the injection mold with minimal information.The number of external connections should be kept to a minimum,and preferably two(one inlet and one outlet)per mold half.If more than two connections are required,then the connections should be labeled”in”and”out”to help the operator avoid forming a dead circuit.To avoid damage to the cooling system,all external components should be recessed to avoid direct contact with tie bars,work tables,or other items.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to choose good material for your mold?

            How to choose good material for your mold?       1.For the appearance of product quality requirements, mold longevity, mass production, and the molding parts material selection are as follows: a) high-grade imported steel cavity to be high mirror polishing performance, such as 718 (P20+Ni), NAK80 (P21), are pre hardened state, without heat treatment. B) core can be used in low-grade imported P20 or P20+Ni steel, such as 618, 738, 2738, 638, 318 and so on, are pre hardened state; mold of small batch production, can also be used for domestic plastic injection mold steel or S50C, S55C and other imported high-quality carbon steel. .     2. for the general appearance of the product quality requirements of the mold, the molding parts and materials are as follows: a) small, precision mold cavity and core are selected mid-range imported P20 or P20+Ni steel. B) of large and medium sized mold, the plastic molding has no special requirements on steel, the cavity can be used in low-grade imported P20 or P20+Ni steel; core can use low-grade imported or imported high-quality carbon steel P20 steel S50C, S55C etc., can also be used for domestic plastic mold steel. (c) for the cavity of the etched pattern, the 2738 (738) grade P20+Ni should be avoided when the ground grain is etched. .       3. on appearance quality requirements of the internal structure, the molding material has no special requirements on steel, the forming parts material selection are as follows:       a) for large and medium sized mold, imported P20 or P20+Ni steel cavity can be used low, can also be imported high quality carbon steel S55C, S50C or P20 domestic or P20+Ni plastic mould steel; core can use imported or domestic high-quality carbon steel.       b) for small die, if high yield, complex structure, import P20 or P20+Ni steel cavity can be used low, also can choose the domestic P20 or P20+Ni plastic die steel; core can be domestic plastic mould steel.       c) for small moulds with relatively simple structure and low output, the cavity core can be made of domestic plastic mould steel or high quality carbon steel.Hello,i am Cherry,if you need any help,pls contact me via email:injectionmold2008@163.com  Whatsapp:+86 15112289056

How to choose the correct gate type and the correct mold steel?

The plastic injection mold material mainly depends upon the annual shot quantity requirement. But it also depends upon part design and part plastic material.For shot quantity requirements of less than 500,000 prehardened tool steel (called P20) is most commonly used for cores and cavities and the mould base.Although mild steel could also be used for the injection mould base as well.This steel is cheap.Also, aluminium is growing in popularity in the automotive sector.Aluminium is much easier to machine and handle compared with tool steel so the cost of manufacture is less.Cycle times are also better but mold maintenance is critical to ensure part quality – anybuild up of residue will damage the shut off surface and cause part flashing.Anything above 500,000 the use of thru hardened tool steels such as H13 or H11 should be considered for the cores and cavities. These materials will produce quality parts for much longer than P20 or aluminium because mould wear is less.For corrosive environments such as when molding PVC plastic, stainless steel tool steels can also be used in mold construction. Stainless steels will minimize corrosion.In addition to the above, part design & mould design play a role in material selection.. Some part designs will require moving or rotating components in the mould design. One option is to use nitriding steels so that “pick up” or damage does not occur when plastic mould components move relative to each other. Examples of nitriding steels are P20 & H13.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to choose material for stamping mold parts

Reasonable selection of  mold material and correct heat treatment process are the key toensure the life of die. Take stamping mold for example,how should we choose the material for stamping mold parts in mold processing? In short,we should take the following conditions into consideration:1.Batch production2.Material property3.Lower production cost4.Developing special die steel5.Considering the production and use of stamping dies in Chinaif you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

Mold Material Selection

          As part of the mold base and materials procurement process.the various types of metals must also be selected.Just as there are many different plastics suitable for injection molding,there are many ferrous and non-ferrous metals that are suitable for use in injection molds.          Some of the more common metals and their properties are provided in Appendix B.Of all these metals,AISI P20 is the most common due to it's favorable combination of properties.However,P20 is sometimes improperly specified in many molding applications since other metals would provide better performance,lower mold molding making cost,or materials will be discussed.    Hello,i am Cherry,if you need more details,pls contact me by email:injectionmold2008@163.com.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

What kind of steel do you use for plastic mouldings?

We can use any type of steel appointed by customer or popular in the market.Such as P20, 718, 8407, NAK80, H13, S136, DIN 1.2738, DIN 1.2344, etc.

What kind of steel do you use for plastic mouldings?

We can use any type of steel appointed by customer or popular in the market.Such as P20, 718, 8407, NAK80, H13, S136, DIN 1.2738, DIN 1.2344, etc.

What is the normal steel for injection mold and what is their usages?

What is the normal mold steel for injection mold and what is their usages?P20 - general requirements of the plastic mold steel, produced in the United States, can be electric erosion operation, the factory state pre-hardened HB270-300, quenching hardness HRC52.718 - high standard plastic injection mold steel, produced in Sweden, suitable for electric erosion operation, the factory state pre-hardened HB290-330, quenching hardness HRC52.Nak80 - high mirror, high precision plastic mold steel, produced in Japan Datong strain, the factory state pre-hardened HB370-400, quenching hardness HRC52.S136 - anti-corrosion and mirror polishing effect mold steel, produced in Sweden, the factory state pre-hardened HB H13 - ordinary die-casting mold steel, for aluminum, zinc, magnesium and alloy die-casting, hot stamping die, aluminum extrusion die.SKD61 - advanced die-casting mold, produced in Japan Hitachi strain. After Ballast re-melting technology, its life is longer than H13, used for hot stamping die, aluminum extrusion die.

What is the character of 718H mould steel?

718H injection mould steel is one of the mould steel.718H mould steel has 40%s carbon element.718H steel plate like other injection mould steel plate.718H steel plate often used in the machinery, radio instrumentation, electrical, electronics and other industrial sectors in the manufacturing part of the main processing tools. 718H mould steel Application:718H mould steel is the machinery, radio instrumentation, electrical, electronics and other industrial sectors in the manufacturing part of the main processing tools. Mould steel can be made into cold-mold steel, hot-rolled mould steel and injection plastic mold steel .injcetion mold, injection mould factory, China injection mould manufacture, plastic injection products producing

What is P20 mold Steel?

There are #45, p20, 718, 2738, H13, S136  6 different steels for mould making, different price for different character and quality. And P20 is the cheapest steel for mould  making, Today, We discuss P20 at first.P-20 mold steel polishes out smother than tool steel which help with the release of molded plastic parts.  P-20 is mold quality alloy steel supplied in the prehardened condition. Special melting and refining practices are utilized to produce a uniform product with exceptional cleanliness. These characteristics allow P-20 to be polished to an extremely high finish required for plastic molding. The material is tested to rigorous tool steel standards to ensure uniformity of structure and freedom from defects. P-20 is supplied prehardened to 262/321 BHN. The balanced alloy composition of P-20 ensures a uniform cross-sectional hardness.Injection mold factory