top of page

Understanding Forging and Casting Release Agents
 

1. About Forging Release Agents

    1.1. Purpose of using release agent

       The reason for using the forging release agent is used to protect the forged surface and the tool surface and to facilitate the       

       forging work.

       § Distribute forging load
       § Resistant to sticking and separated smoothly
       § Cooling effect
       § Extend the life of the mold
       § Metal distribution support
       § Extended life of mold and tool
       § Attenuation of demoulding
       § Reduce friction
       § Helps to get the correct dimensions-works the same in forging or casting.

 

     1.2. Processes of Technology Development

        Forging Machine has been developed in various shapes to produce various forging products. However, it was necessary to meet              the following requirements and
        High quality forged lubricants have been developed.

 

        § Extended the life of the mold
        § Maintain the structure and surface of forged products
        § Maintain stable mass production system
        § Prevention of defective products
        §Eco-friendly products of forged lubricants that are not harmful to human body
        § Lubricant that is easily cleaned and removed from the mold surface

   

        However, the following problems were discovered in the development process.

 

        § Damage damage due to bursting, cracking, torsion and side wear
        § Irregular size of forged products
        § Feed-In Phenomenon
        § Structural structure
        § Irregular vertical and horizontal spray angle
        § Inaccurate spray timing adjustment

 

     1.3. Potential problems associated with release lubricants and their solutions

     

        § Continuous operation causes problems when the mold gradually overheats and is not properly cooled by lubricant.
           The mold is usually preheated between 180 ° C and 230 ° C during hot forging, and the forged product is heated up to 1200 ° C               to transfer hundreds of degrees of heat to the die.
           The mold must be kept between 250 ° C and 290 ° C to continue normal operation.
           When the mold is heated above the level, the mold begins to break. Therefore, the forging lubricant must have an excellent                     cooling effect and lower the temperature.

        § Forged lubricants should have a good coating effect. The temperature of the mold varies from 20% to 30% just before and after             forging, even if it is kept within the normal range.
           Lubricants must have a stable application effect at these rapid temperature changes.

        § Condition of mold back surface: Mold release lubricant should be removed immediately after forging. After good lubrication, the             mold is just as forged as oil
           It should be polished. If a release lubricant remains on the surface or edges, it may reinfiltrate and cause contamination.

        § Release lubricants must have a two-sided lubrication effect. The die release lubricant is the original liquid before it is sprayed                 and is coated on the product when it is dried by heat after spraying.
           During the coating process, good products cannot be produced without evenly lubricating both sides. Therefore, release               

           lubricants must have a double-sided lubrication effect.

         § Forging machines are mainly divided into hammer, press and upset types. Some die release lubricants are very effective for

           hammer type forgings that do not work with press type.
           This is because a larger impact is transmitted to the die and the product during hammer-type forging. At this time, the effect of

           this kind of lubricant acts as a die release.
           Such products have a low impact, especially when press forging, high quality products are effective.

         § The faster the spray, the better the application. As the mold heats up, some release lubricant evaporates as if it is spraying

            water on the heater stove.
            If the release lubricant does not adhere to the surface and scatters, there is no application effect. Oil can be added to prevent

            such spills.
            
The oil effectively helps the die release lubricant to be adsorbed on the die. In addition, the strong explosion of oil helps release              the mold.
            However, these powerful explosions can also cause serious cracks in the heated die.
            Oil or poor quality die release lubricants crack the die and look like capillaries as follows:

        § The letters on the manufactured product must be clearly readable. Some letters or numbers may be engraved on the product to              be manufactured.
            If the coating of the lubricant is too thick or unsuitable, fill the grooves of letters or numbers to prevent clean letters.

        § It is important to adjust the pH of forging lubricants. Forging machines are made of steel and nonferrous metals (copper and                   aluminum).
           Steel is generally corroded with acids, while non-ferrous metals are susceptible to alkalis.

        § The release lubricant must be highly dispersible and have the least amount of debris. Otherwise, the tank pipeline and spray                   nozzles will be clogged.

        § Too strong release effects can often cause the product to pop out of the mold during forging.
           To solve this problem, the spray amount of the die release lubricant must be reduced.

        § Most forged products stick to the top or bottom die. This happens when the release lubricant is not completely sprayed.
           In this case, it is necessary to spray the release lubricant once more on the sticky side of the die.

        § Well-type lubricants must be easy to wash. It must be easy to clean from greased skin or clothing.

스크린샷 2020-03-10 13.55.03.png
스크린샷 2020-03-10 14.01.04.png

1.4. Types of Release Agents

 

      § Graphite (graphite)
         ▪ Water Based and Oil Based
         ▪ Safe and non-toxic, lamella solid has excellent friction reduction properties
         ▪ Careful selection of particle type and size allows use over a very wide temperature range

 

      § Non-graphite system (non-graphite)
         ▪ Consists of soluble salts and polymers that perform under less severe conditions requiring lower levels of lubrication

   

      § Wax
         ▪ Conventional paraffin / mineral waxes used in light alloys
         ▪ These are used more often as additives to improve the performance of lubricants with polymers

 

      § Grease
         ▪ Traditional products often containing graphite
         ▪ Similar to oil, but convenient to use Low-volume and low-temperature applications

 

1.5. Lubricant carrier media

     There are several types of intermediates needed to lubricate molds and tools.
     It is important to select a suitable carrier considering the conditions such as the temperature, material, and forging composition of     

     the mold.

 

       § water
          ▪ Most commonly used.
          ▪ Spray must be applied to the die, creating a very safe and clean working environment.
          ▪ Water is added to the concentrated lubricant dispersion. This type of product is very economical.

 

       § Oil
          ▪ Used for more traditional carriers and agents used in inaccessible high temperature tooling or die areas.
          ▪ Oily products are often supplied already manufactured
          ▪ Excessive unburned oil forging can cause explosion / diesel in the die pocket and damage the die and forging.

 

       § Solvent
          ▪ Quick dry alcohol is used for tooling and pre-coating of billets and preforms that require a lubricating and protective coating.

             

1.6. Advantages of water based lubricants

          ▪ Easy to operate by using spray.
          ▪ As the water evaporates, the die surface is cooled to the wetting temperature so that the coating of lubricant can be formed well.
             A uniform coating allows lubricant to be delivered to the die surface.
          ▪ Safe, eco-friendly and user-friendly.
          ▪ Lower production cost per forging than other products.
          ▪ Better productivity.
          ▪ Reduce waste disposal costs.

§ Forging Equipment and Spraying Method
 

스크린샷 2020-03-10 16.09.02.png
bottom of page