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How to pull plastic injection mould core

To provide as safe and efficient a plastic injection mold as possible,the mold designer should specify the use of limit switches to confirm that moving core is in its forward or retracted position.These position signals can be used by the injection molding machine to ensure that the moving cores are properly positioned so as to not damage the molded parts or the injection mold during mold opening or part ejection.Furthermore,the mold designer should strive to design the moving core such that the injection mold opening or part ejection does not damage the mold if the moving core is improperly positioned.Consider,if the mold is opened and the part ejected with the moving core in itis forward position,it is nearby ejector sleeve and ejector blade.Obviously,this event is undesired and should not occur for a properly set molding process.However,such events do occur and molders greatly appreciate a robust injection mold design that can withstand intermittent abuse without reworking the ejector pins,blades,sleeves,or moving cores.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to Minimize Distortion of Moldings

Just as the ejection forces can cause stress and deflection in the ejection system components, the ejection forces can also stress and deflection in the plastic moldings. To avoid permanent distortion of the plastic moldings, the number,location,and design of the ejection components must be development to apply a low and uniform state of stress across the moldings. If the ejection force is uniformly distributed across many points in the mold cavity,then the molding will be uniformly ejected from the mold without any permanent distortion.If you need help,please contact me,Lisa. And my email is injectionmold2005@163.com    whatsapp/skype:+86 15617940830

Do you know cooling system design process

Given that there are multiple objectives in the design of the cooling system,it is not likely that every objective will be simultaneously optimized.The goal is for the plastic injection mold designer to reach a good compromise,such that fast and uniform cooling is achieved in a cost effective manner.The following seven step analysis is provided to support the plastic injection mold design decisions that have to be made.Afterwards,some common cooling issues and designs are developed.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

HOW TO ADJUST Plastic injection mould Dimensions

After the shear rate,pressure,drop,and gate freeze time have been calculated for an initial design,the type and dimensions of the injection mould gate can be modified to improve the design.For aesthetic and de-gating purposes,smaller gate sizes are desired.As the previous examples have shown,however,excessive shear rates may dictate the use of larger gate sizes.These shear rate calculations are dependent upon an assumed flow rate,and this flow rate will not be known until after the molder has optimized the process with the implemented mold. For this reason,the plastic injection mold designer should assume a reasonable flow rate for analysis,select a type of gate that can be enlarged, and specify dimensions that are “steel safe”.In this way, the size of the gates can be readily increased to reduce shear rates as needed.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to control Mold Wall Temperature?

The analyses and designs for cooling system are adequate for most injection molding applications.However,there are some applications in which the use of conventional cooling designs in unacceptable.Normally,the development of a solidified skin occurs when the hot polymer melt contacts the cold injection mold wall.In some molding applications,the solidified skin may lead to premature freeze-off of the melt in the cavity,excessive birefringence in the molded part,or inadequate levels of gloss or surface replication.In other applications,mold wall temperature fluctuations across the surface of the plastic injection mold cavity may lead to a lack of dimensional control.As such,some molding applications involving lenses,airplane cockpit canopies,optical storage media,and fiber reinforced materials may seek to improve the quality of the moldings through dynamic control of the mold wall temperature.Several different strategies are next discussed.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to select plastic injection mold base

After the core and cavity layout inserts have been initially sized,the plastic injection mold layout can be further developed and the mold base selected.It is critical to order a mold base with appropriately sized plates and materials,since any mistakes in the mold base selection can consume significant time and expense.To determine the appropriate size,the mold designer must first arrange the injection mold cavities and provide allowance for the cooling and feed systems.Afterwards,the mold designer should select a standard size from available suppliers and verify suitability with the molder’s molding machine.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How about Mold Base Supplier?

Plastic Injection Mold Base SupplierThe development of standardized Plastic Injection mold base designs is considered a significant advance in the history of the plastics molding industry.A majority of mold makers in the U.S.use standard mold bases to reduce the time and expense of creating molds.Furthermore,mold maintenance is simplified through the availability of standard mold components that are replaceable at the molder’s facility.It is noted that many mold makers do not use mold based for various reasons.Mold bases for very large parts,such as automobile body panels,may not be available as a standard product and so may require custom design and manufacture. Some mold makers believe that standard mold bases are inferior in quality,and strive to provide a better mold with higher quality or lower lifetime cost through the development of custom designs with proprietary components.At the other extreme,some mold makers can produce a simple but fully functional mold for less cost than just the standard mold base could be purchased in the United States.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How does climate change affect injection molding?

The difference is between summer and winter months. There is a difference due to the climate. Process conditions so far have not shown the improvement we need to match the physical property of parts injection molded in winter months where air is cooler and lower humidity.My first reaction to this - and admittedly slightly "outside of the box" - is that the ambient air that is between the advancing melt fronts will be rapidly compressed (to an extent dependent on how easily it vents versus how quickly the air volume is reduced) and heat up. Clearly, it is not going to reach as high a temperature in winter as in summer, nor will the lower amount of moisture it contains be as likely to get entrapped between the melt fronts and potentially weaken them as they join. In higher humidity conditions, apart from the increase in water content in the air in the tool void prior to fill, maybe you're getting condensation at times (if the press is held-up between shots), in which case you will be pushing lots of water into the weld-line. Worth noting, also, is that even if you have the same barrel settings and water temperature and flow settings throughout the year, actual conditions that the material encounters (precise melt temperature at point of entry into the injection mold and actual mold surface temperatures) will vary, because of the R.H. and temperature differences. Hire a thermal imaging camera at relevant times and look at the readings on the parts at point of ejection. You'll see differences, I'm sure.There are possibilities to employ vacuum-assisted venting (by default, this would pull moisture out with the air) in the injection mold void prior to fill. Also, as I've seen with multi-impression PET preform molding, air-conditioning enclosures around machines.I used to assist periodically in an injection molding shop in China, with 90% RH at 40°C (104°F) and had not been made aware of this problem. That is not to say, of course, that it wasn't there. I cannot see that heating the pellets before use will resolve this particular problem, even if advisable for other reasons. I'm certain it's nothing to do with the material's weather resistance.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

do you know more knowlege about plastic injection molding?

INJECTION MOLDING     Plastic  Injection moulding bre or Injection molding ame,is a manufacturing process for producing parts by injecting material into a mould. Injection moulding can be performed with a host of materials mainly including metals (for which the process is called  die-casting molding ,glasses elastomers .confections, and most commonly thermoplastic and thermosetting polymers. Material for the part is fed into a heated barrel, mixed, and forced into a moild cavity where it cools and hardens to the configuration of the cavity. After a product is designed, usually by an industrial designer or an engineer, moulds are made by a mould-maker (or toolmaker) from metal, usually either steel or aluminium, and precisino-machined to form the features of the desired part. Injection moulding is widely used for manufacturing a variety of parts, from the smallest components to entire boday panels of cars. Advances in 3D printing technology, using photopolymers which do not melt during the injection moulding of some lower temperature thermoplastics, can be used for some simple injection moulds.          Parts to be injection moulded must be very carefully designed to facilitate the moulding process; the material used for the part, the desired shape and features of the part, the material of the mould, and the properties of the moulding machine must all be taken into account. The versatility of plastic injection moulding is facilitated by this breadth of design considerations and possibilities.Hello,i am Cherry,if you need any help,pls contact me via email:injectionmold2008@163.com  Whatsapp:+86 15112289056

What Are Ejector Pins of plastic injection mould?

Ejector pins are long pins that are used in the injection molding industry to push the final molded product out of the mold. They are used forcefully to eject the solid part out of the plastic injection mold and are usually made of high-quality steel. They are also known as knockout pins, knock-out pins or KO pins.Typically, these pins are extended and retracted to force the part out of the molded cavity and are the cheapest means of ejection. The pins might leave marks behind, so they are usually applied only when the parts have sufficiently cooled down, to avoid the deforming the parts. Ejector pins of injection mould are available in various sizes and shapes, such as round, bevel-headed, straight and cylindrical. They can be customized and precision-engineered to suit the application. Important factors for one to consider when selecting pins are corrosion resistance, durability, tolerance and tensile strength.It’s important for the right type of mould ejector pins to be selected for efficient part production in plastic injection molding applications. There are three different types of ejector pins available. Each type possesses specific characteristics, and they are used in different environments. The most important factor that differentiates these pins is the temperature at which they can be used, because this affects their durability and life span. Pins made for low temperature environments will deteriorate rapidly when used in a high-temperature setting.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to choose injection mould ?

As far as i know, there are three factors  must be considered when choose the plastic injection machine for your products.1. Max mould length of a side must less than the space of tie bars.    how to estimate the mould dimensions for your product?    usually we can estimate the injection mould dimension as below:    length of mould:  length of your product add 300mm, if the product is very big then we   can add 400mm.    width of mould: width of your product add 300mm, if the product is very big then we can add 400mm.    height of mould: 2.5 times of product height, if the plastic injection mould has special demand, then we can add more, if the mould feeding type use hot runner system, then we should add runner plate thickness on.2. The weight of product (gram) must less than theoretical shot weight (gram) of the injection machine.    if your mould is multi-cavity, then the total product weight should less than the shot weight. otherwise your product could not be make perfectly.3.  Based on upper two factors,  we should also need to consider the clamping force. clamping force is difficult to estimate, we can estimate it by below:    Clamping force = projected area of product in the direction of opening and closing mould (cm²) ×the number of mold cavity×in-mold pressure (kg/cm²)    Projected area of product in the direction of opening and closing mould is generated by the product appearance size.   In-mold pressure is different with different materials, generally we can calculate it by 350-400 kg/cm².  if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

What about Vertical injection molding machine

Vertical injection molding machine: the arrangement of plastic injection mold clamping device and injection components is vertical.  Advantages: cover small area, easy assembly and disassembly, easy installation, plasticization can be more uniform.  Disadvantages: the molded product is not easy to automatically remove from the injection machine but need human force, difficult full automation and hard for large parts; high machine, difficult feeding and maintenance. Shot volume of this type of injection machine is generally below the 60 cm3. (small) if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

What about Horizontal injection molding machine

Horizontal injection molding machine: injection mold clamping device and the injection mould device is in a horizontal line arrangement.  Advantages: not high, easy operation and maintenance, high degree automation, stable installment. Disadvantages: cover large area at present, most of the injection molding machine adopts Horizontal form.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.comwhatsapp+8615958816137  skype:injectionmold2006@163.com

How to Improve The Life of Mold?

Speaking to users, improve the life of the mold can greatly reduce the cost of stamping. Factors affecting the life of the mold is as follows:  1. the type and thickness of material;  2. choose a reasonable time of entering the mold;  3. in the form of the plastic mold structure;  4. there is good lubrication when material stamp;  5. whether the mold through a special surface treatment;  6. the symmetry of the upper and lower turret;  7. rational use of adjusting pads;  8. whether the appropriate use of oblique edge injection mold;  9. machine mold base are damaged or intact.if you need help, pls contact me, I am Tea, my email is injectionmold2006@163.com