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Pretoughening and Carburising or Case Hardening

Pretoughening

The process of through-hardening steels and then finish machining them is time consuming and expensive; to avoid this, prehardened or pretoughened steels have been developed,the effect the steel is heat-treated in a similar way to normal through-hardened steels but it is tempered back to a lower hardness.
For example, tempering at a temperature of 200 °C gives a hardness of approx* 50 Rc, while tempering at 600 °C gives a hardness of around 30 Rc. The big advantage is that while steel at 50 Rc cannot be milled or turned, material at 30 Rc can be. This means that all machining can be carried our without any need for further heat treatment. A commonly used version of pretoughened steel is A/Sf P20. The main reason for using pretoughened steel is that it does not have to undergo subsequent heat treatment hence avoiding the risk of distortion from a full hardening process.
Clearly, however, the through-hardened AISI H13 at 50 Rc is better suited to long-running tools than the pretoughened AISI PZ0 at 30 Rc .The lower the hardness of the steel,the quicker it will wear and suffer damage.P20 steel can, however, be subsequently treated with implantation to increase surface hardness by up to 15%. Pretoughened steels would normally be chosen where the risk of distortion on delicately forms is unacceptable- It would also be selected for medium-run jobs where the cost does not jusrify full hardening and finishing operations.

Carburising or Case Hardening

This process is a carry-over from the days when suitable alloy steels were unavailable. It consists of heating low-carbon steel (mild steel) in a carbon-rich gas, in a liquid (cyanide salt bath) or in a container filled with a form of carbon material. The carbon ingresses into the surface of the steel, where a hard structure is formed giving a component with a hard surface and a tough, more flexible interior. Modern hardening techniques have largely superseded carburising but there is a trend towards the use of this technique in recent years where the advantages of the hard skin and soft core are attractive.
Carburising may be used to advantage where any deflection of components is taking place such that through-hardened parts may break much earlier, A disadvantage of carburising is that it is quite prone to distort parts, so that subsequent machining is required to combat this effect, Carburised parts are not suitable for heavy direct loading applications where they will fail. For such loading conditions, the through-hardened alloy steels should be used. Carburiying is used frequently for surface hardening of cavities and puncht’s for very large mold tools where through-hardening would not be possible- This proccsy is also used fur hardening cavities that have been hohbed.

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Extend the service life of die casting molds

Extend the service life of :

 

Due to the long-term use and high injection speed of the die-casting mold, after a period of use, there will be more or less deposits on the core and cavity of the die-casting mold. These deposits adhere firmly to the surface of the core and cavity, and the hardness is quite high, making it difficult to remove. These deposits are combined with a small amount of die-cast metal, coolant and mold release agent impurities under high temperature and pressure. In the process of removing these deposits, we should use mechanical methods or grinding methods to remove them. During the removal process, other surfaces of the die-casting mold should not be damaged to avoid dimensional changes.

 

Periodic maintenance of the die-casting mold can keep the die-casting mold in a very good working condition. The maintenance of die-casting molds is very necessary, which can effectively slow down the generation time and extension speed of mold cracks and increase the service life of the mold.

 

 

 was founded in 1987, is leading full-service die Casting Tooling, , , Gravity casting manufacturer. We are a solution provider offering a wide array of capabilities and services that include engineering support, designing, molds, complex CNC machining, impregnation, tumbling, chrome, powder coating, polishing, assembly and other finishing services. We will work with you as partners not just suppliers.

 

  – Full Service in Die Casting & Machining Since 1987

  – Die Casting Machine from 180 to 4400 tons

  – 1500+ Set of Casting Parts Exported Overseas

  – Trusted By Top Brandings in Automotive & Medical Industry

  – IATF 16949 Certificated Factory

  – Famous“Die Casting City in China”

  – Well-trained Staff Will Support You Efficiently From RFQ to Shipment.

 

What is the melting point of silicone rubber?

silicone rubber is a highly active adsorbent material, is an amorphous substance, its chemical molecular formula is mSiO2-nH2O Because it is a hydrate, the temperature is too high will first lose crystalline water, the loss of crystalline water is not called silica, but called silica Therefore, silica only the highest use temperature, no melting point, silica: SiO2 is also known as silica. It is widely distributed in nature, such as quartz, quartz sand, etc. White or colorless, with high iron content is light yellow. Density 2.2 ~ 2.66. Melting point 1670 ℃ (scale quartz); 1710 ℃ (square quartz). Boiling point 2230 ℃, the relative dielectric constant is 3.9. 
The maximum temperature for regeneration of various industrial silica gel should not exceed the following limits.
Coarse pore silica gel shall not be higher than 600℃.
Fine pore silica gel shall not be higher than 200°C.
Blue gum indicator (or discolored silica gel) shall not be higher than 120℃.
Silicone aluminum rubber shall not be higher than 350 ℃.
After the regeneration of silica gel, its moisture is generally controlled at 2% or less can be put back into use

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    Does daily wear mask harmful to the skin

    Wearing an airtight mask for a long time will make the droplets during breathing and taChinaing form a local hot and humid environment around the mouth, causing dust and bacteria in the environment to adhere to the mask easily. In addition, if the mask is not replaced regularly, the pores will be blocked and the acne will be formed, resulting in the phenomenon of "mask pox". Moreover, urban pollution is becoming more and more serious. When choosing to wear masks, more and more people use fashionable masks with a sense of design and give up disposable masks. This has increased the hidden danger of facial skin. If you do not regularly clean the masks, masks are easy to hide dirt and increase the risk of acne.

     

    How to prevent the harm of mask to skin:

     

    Don't ignore chin acne. Always clean and replace the mask. In addition to avoid long face mask acne, should also pay attention to "Chin pox", it is best to wear a disposable mask with good air permeability, which is clean and hygienic. And the mask with too thick and poor air permeability, especially in the sultry environment, is easy to stimulate the skin near the chin. If it is an ordinary mask, it should be cleaned or replaced from time to time to avoid the growth of bacteria.

     

     

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    What are the characteristics of zinc alloy die casting?

    The main added elements of zinc alloy die-casting are aluminum, copper and magnesium. Zinc alloys can be divided into deformation and cast zinc alloys according to the processing technology. Cast zinc alloys have good fluidity and corrosion resistance, and are suitable for die-casting instruments and auto parts. Shell etc.

    Features of :

    • (1) The proportion is large.
    • (2) Good casting performance, it can die-cast precision parts with complex shapes and thin walls, and the surface of the castings is smooth.
    • (3) Surface treatment can be carried out: electroplating, spraying, painting.
    • (4) When melting and die-casting, it does not absorb iron, does not corrode the pressure, and does not stick to the mold.
    • (5) It has good mechanical properties and wear resistance at room temperature.
    • (6) Low melting point, melting at 385℃, easy to die-casting.

    PTJwas founded in 1987, is leading full-service die Casting Tooling, aluminum die casting, zinc die casting, Gravity casting manufacturer. We are a solution provider offering a wide array of capabilities and services that include engineering support, designing, molds, complex CNC machining, impregnation, tumbling, chrome, powder coating, polishing, assembly and other finishing services. We will work with you as partners not just suppliers.

    •   – Full Service in Die Casting & Machining Since 1987
    •   – Die Casting Machine from 180 to 4400 tons
    •   – 1500+ Set of Casting Parts Exported Overseas
    •   – Trusted By Top Brandings in Automotive & Medical Industry
    •   – IATF 16949 Certificated Factory
    •   – Famous“Die Casting City in China”
    •   – Well-trained Staff Will Support You Efficiently From RFQ to Shipment.

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    Are Food Grade Silicone Cake Molds Better Than Other Baking Molds?

    What is the difference between food grad silicone cake mold and normal silicone cake molds? This question is very easy.Food grade silicone cake mold is a kind of cake baking mold made of food grade silicone rubber which FDA approved that it can direct contact with food. Is more safe and reliable. As it is know to all, there is hidden danger of diseases if we ate contaminated food.Baking cake mold trays are such important tools we use frequently. Many toxic chemical substances will enter in our body with cake if the cake baking mold we use for baking is toxic.Though bake molds which never be test by FDA is more cheaper, it is higher risk. Health is priceless. You may save 1 dollar on cake molds, however, you may pay thousands dollars for your health.Food grade silicone cake molds, is heat resistant, odorless and non-toxic. It is better than normal silicone molds. 

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    Plastics CEOs on the hot seat in 2021

    Let’s call 2021 the year of big decisions for CEOs.Here are just a few of the questions they face: Do you require masks and vaccinations, encourage them, or make them optional? How do you handle people working virtually vs. showing up in person?Policies on work travel are also in flux, as well as whether to host visits from suppliers and customers.These were easy decisions a year ago. Companies simply followed the guidance from the Centers for Disease Control and Prevention, in addition to state or local regulations.But now CEOs are facing tough choices on questions where literally everyone has an opinion. And often the opinions are strongly held. Considering what’s at stake, that’s not a surprise.Last year everyone followed the rules and adapted. This year is different. So how do you make difficult decisions?Part of my pandemic routine has included listening to podcasts from Harvard Business Review and Northwestern’s Kellogg School of Management. They tackle important issues like how to support stressed-out employees and manage people virtually.The more I listen, the more I’m convinced that we’re seeing real changes in the way we work and that things aren’t ever going back to “normal.”Of course the situation at manufacturers may be a lot different than I see at a business newspaper publishing company. So how will your companies deal with the changes?CEO readers will, no doubt, listen to the experts and consult with workers, colleagues and their senior leadership teams. But the big decisions often come down to one person. As the famous sign on Harry Truman’s desk in the Oval Office said, “The buck stops here.”With that in mind, I’d like to invite CEOs to participate in our seventh annual CEO issue, which will be published Sept. 6. We want to profile current and retired industry CEOs, similar to our recent Women Breaking the Mold and Rising Stars special issues. Once again, we are looking for people with president or CEO titles at plastics companies. That includes both processor and supplier companies, both inside and outside of North America. As always, diversity is strongly encouraged.This year, we are adding some more questions about how CEOs are dealing with the coronavirus pandemic. That’s in addition to asking CEOs to share their stories about how they ended up in plastics, to talk about mentors who have helped along the way and to share their advice with workers considering a career in the industry.Go to to fill out the survey. Submissions must be received by Aug. 16. Don Loepp is editor of Plastics News and author of the Plastics Blog. Follow him on Twitter @donloepp.Do you have an opinion about this story? Do you have some thoughts you’d like to share with our readers? Plastics News would love to hear from you. Email your letter to Editor at Staying current is easy with Plastics News delivered straight to your inbox, free of charge. Subscribe to Plastics News Plastics News covers the business of the global plastics industry. We report news, gather data and deliver timely information that provides our readers with a competitive advantage.Customer Service:

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    Precautions for the use of die-casting molds

    The correct use of can not only extend the life of aluminum alloy die-casting molds, but also improve the quality of products. So what should be paid attention to in the process of using aluminum alloy ?

    1. Clean the parting surface of the mold. If there are flashes that are not removed in time, the parting surface of the mold is easy to collapse, causing aluminum to run out during the production process, which not only increases the cost of die casting, wastes aluminum materials, and product quality It is also unstable, and at the same time increases the probability of work-related injuries.

    2. Use of mold cooling system. When the mold cooling water is used correctly, it not only prolongs the life of the mold, but also improves the production efficiency, effectively prolongs the life of the mold, saves the die-casting cycle, improves product quality, and reduces the use of mold release agents.

    3. The mold must be preheated during the start of production to prevent the cold mold from suddenly encountering hot molten metal from tortoise cracks.

    4. If the mold is equipped with neutron control, it is forbidden to connect the signal line between the die-casting machine and the mold to prevent the die-casting mold from being damaged.

    Common cooling methods for :

    For the life of the die-casting mold, it is also more important to cool down in time when the temperature of the die-casting mold is high. The cooling methods of die-casting molds include water cooling, air cooling, heat pipe cooling and indirect cooling.

    1. Water cooling: Cooling water channels are provided on the die-casting mold to allow circulating water to pass into the molding insert or core to take the heat out of the mold. Water-cooling has high cooling efficiency, which can effectively reduce the surface temperature of the cavity, but it increases the complexity of the die-casting mold structure. It is mainly used for molds that require large heat dissipation. In order to avoid condensation on the surface of the cavity, the temperature of the cooling water should be higher than room temperature.

    2. Air cooling: For parts that are difficult to be cooled by water in the die-casting mold, air cooling can be used, which can be blown by a blower or compressed air. Air cooling can not only cool the die-casting mold, but also blow the paint uniformly, disperse the volatilized gas of the paint, and reduce the porosity of the casting. The cooling temperature of air cooling is much lower than that of water cooling.

    3. Heat pipe cooling: mainly used for small parts that are difficult to directly cool with cooling water. In the small parts that need to be cooled, use the heat pipe to export the special heat, and then use the cooling water to cool the heat pipe.

    4. Indirect cooling: In the hot section of the die-casting mold of the mold temperature machine, indirect cooling can be stopped with alloys with high heat transfer coefficient (ammonium bronze, tungsten-based alloy, etc.), and the ammonium bronze pin is screwed into the fixed core and the end of the copper pin With cooling fins to enhance the cooling effect.

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    The environmental protection product: silicone tubings

    silicone tubings are widely used in our daily life, the features of silicone tubings are as following:

    1.Healthy and environmental protection, no smell and shockproof;

    2.Good elasticity, high tear strength, good flatness, resistance to high temperature strength;

    3.Non-toxic,wear-resistant, slip resistance, anti-aging, corrosion resistance and durability;

    The kinds of silicone tubings include flame retardant silicone tubings, clear silicone tubings, colorful silicone tubings, weaving silicone tubings, hardness silicone tubings, soft silicone tubings, heatproof silicone tubings, food grade silicone tubings, platinum silicone tubings, medical silicone tubings, and transparent.

    Comprehensive news about silicone and casting

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    procedures for developing a new plastic product

    procedures for developing a new Plastic product

    Below we list a fairly standard sequence of steps that you will probably have to go through in the course of designing and making a new product You can use it as a checklist to make sure you don’t overlook some vital step when planning the work, or when it has begun. But you may well have to depart from it in particular cases, and not all the steps will always be necessary.

    The brief

    Write it out clearly.State the problem, rather than specifying the product you’re aiming at, which will limit your imagination.
    Specify what costs are acceptable.

    Research

    Study the activity in which the problem arises, the people who will be using your product, and the environment in which it will be used. Study possible materials and methods of moulding.

    Study possible materials and methods of moulding.
    Look at existing products that are used to aid this activity.
    Get relevant ergonomic information ,that is information relevant to the efficient carrying out of the activity, such as measurements of reach, or thrust, or frequency of use, or users’ bodily dimensions.
    Find out if there is a relevant  Standard.

    Specification

    Prepare a technical specification outlining the performance required.
    Decide, as far as possible at this stage, what materials and processes could be used. 
    Make tests on materials and processes if necessary.
    Estimate costs and confirm that they are within your limits.

    Design

    Sketch possible shapes for the product
    Sketch details, joints, etc, and methods of fixing typical sections, and possible assembly methods.
    Decide on the most suitable design.
    Prepare a general arrangement drawing.
    Make a cardboard model — full-size if possible, otherwise to scale.
    Test the model if possible.
    Modify it if necessary.
    Make detailed drawings of mouldings and moulds.
    Show how mouldings are to be assembled.

    Making

    Make moulds
    Make mouldings, trim to shape and fit components.
    Assemble complete product.

    Test and evaluate

    Test the product, using a typical operator in proposed working environment.
    Photograph the product in use.
    Prepare a critical report.

    Redesign

    Suggest areas where the product needs to be changed, make drawings to show improvements, and repeat as much of the sequence as necessary from the design stage.

    April 21, 2020 plastic mold

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