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Too low a clamping force can lead to flash or non-filled parts. Too high a clamping force can lead to mold damage. 14 Clamping tonnage/force The projected area is multiplied by a factor (injection pressure) from 1 5 tons/inch2 (13.8 68.9 MPa) to determine the total amount of clamp tonnage required.
In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Normally, the force rating is stated in tons, e.g. a 200 ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons.
This force is required in order to keep the mold closed during the injection process, which is the primary purpose of the clamp unit. Normally, the force rating is stated in tons. So, a specific machine having a rating of 200 tons is capable of producing a maximum clamping force equivalent to a total of 200 tons.
Aug 04, 2008· The clamping force needed can be calculate with the projected area of the cavity times the melt pressure. The projected area of the cavity is the sum of the area of all of the surfaces projected perpendicularly onto the parting plane. ... Youre talking for injection molding but I'm in injection-blow molding, my mold is keep hot so the melt didn ...
Sep 04, 2018· 2. How to calculate clamping force injection molding? The clamping force is proportional to the projected area of the molding, runner and must be opposed by the clamping force. Although a proportion of the pressure produced by the injection cylinder is transmitted to the cavity, various losses occurring in the heating cylinder, nozzle and gate.
To choose right injection molding machines for under developing plastic moulds, we not only need to consider for plastic injection machine injection volume, tie bar distance and min. and max. mold height to put the molds inside, sometimes we also need to check about machine clamping force if enough for plastic molding.
Jan 21, 2019· I need to understand the calculation method for the clamping force needed depending on the part dimensions, cavity, and machine pressure injection. Here is what I have: 1.- See the part dimensions attached. note: dimensions in inches Part weight: 46 grs. 2.- The number of cavities is 4 3.- The machine pressure injection is 213 Mpa.
Aug 01, 2020· This calculation formula is the most precise clamping force calculation for injection moulding without professional software that works on the computer. Clamping Force Calculation method 4: Use CAE software to calculate the clamping force (MOLDFLOW, etc.). The main basis for the classification of injection molding machines is the clamping force.
memo. This formula is used to calculate the force required to clamp the mold halves during injection molding. Generally, the cavity pressure inside the mold is within the range of approximately 300 to 500 kgf/cm 2.The total projection area is the total of the projected areas of the cavities and runners in relation to the parting surface.
May 22, 2020· Since we rate injection molding clamp forces in tons, we will need to divide the 6,000 ppsi by 2000 lb, which gives us 3 tons/in². You can now use this clamp force to multiply by the total projected area to establish the recommended clamp force for your mold. This formula can also be found in …
Oct 04, 2008· Injection molding machines are usually characterized by the tonnage of the clamping force that they provide. The clamping force, indicates the amount of force that the clamping unit can apply to the mold to keep it securely closed during the injection of the molten plastic, picture below shown injection machine from Nissei with type NEX80 (80 ton)
In injection molding, finding the right tonnage can be tricky. Just because a moulding machine can produce a clean looking part without flash it doesn’t mean the clamp is enough. For any particular part, there are a range of clamp tonnages than can produce parts that appear to be ok.
Use the first calculator below to find the shot weight of an injection mould tool. The next step is to find a screw and barrel assembly that has the right capacity for the shot weight so that quality parts can be made. Scroll down to the injection capacity calculator to work out whats right for your needs.
The clamping force required to keep the mould closed during injection must exceed the force given by the product of injection pressure and projected area of all impressions, runners and gate. Lower clamping values can be used with these machines.
Clamping Force Calculator is a tool to calculate the Clamping Force in the injection molding machine based on the different area’s like part projected area, runner projected area, cavity pressure and number of cavities.
Since we rate injection molding clamp forces in tons, we will need to divide the 6,000 ppsi by 2000 lb, which gives us 3 tons/in². You can now use this clamp force to multiply by the total projected area to establish the recommended clamp force for your mold. This formula can also be found in Fig. 2 below.
Sep 18, 2020· Importance of Clamping Force in Injection Molding. Clamping force in injection molding is an important factor because it acts against the separation or swelling force of molding liquid. In order to shape the product in the desired manner, the material must pack against the mold walls. Clamping force serves the purpose of material packing.
Dec 03, 2018· Mold flow analysis will help you determine the volume of your part and runner while determining any factors that would cause safety issues. 3. Know how much clamping force or pressure is required. Pressure plays a significant role in the overall quality of a plastic part. Pressure keeps the mold closed during the injection process.
Clamping Force Calculator. Number of cavities: Part projected area (in²): Runner projected area (in²): Shot projected area (in²): ... Thermal diffusivity (in²/hr): Injection temperature: Mold temperature: Ejection temperature: Theoretical cooling time (s): Correction factor: Corrected cooling time (s): Thermal Diffusivity Calculator ...
Apr 17, 2020· Clamping force of injection molding machine . In the production process of injection molding machine, the raw material will be in a high pressure situation is quickly injected into the mold, thus producing a violent expansion of the pull force, this force may be the impact of opening and closing die limit, resulting in the end of production, and then another kind of force is needed to suppress ...
Sep 18, 2020· The tonnage of an injection molding machine refers to the clamping force rate of the injection mold machine. For example, a 50-ton machine can produce a clamping force that is equivalent to 50 tons. Size is also important in injection-molded machines, as the larger the tonnage rate, the larger the machine.
Q: For big PP parts with undercuts, how do you evaluate the additional clamping force needed to keep the wedges (slides) closed and avoid flash? I want to develop a method to predict Injection Mould Clamping force for big PP parts with a lot of undercuts (8 big wedges in the mould). At the moment, I am using moldflow to predict tonnage but I am always missing 25% in comparison to the real life!
May 14, 2017· Injection Molding – Determining Clamp Tonnage Requirements The clamp unit of an injection molding machine is rated by the maximum amount of clamp force that the machine is capable of producing. Clamp force is required in order to keep the mold clo...
The clamp end of the machine is responsible for providing force to counter all of the pressure that is applied from the injection unit. How much tonnage is applied, location of the force, type of clamping mechanism, and size of mold base all affect the success of the molding process. Determining the correct tonnage is not a simple task.
The clamping force of a plastic injection molding machine is directly proportional to the projected area runner, molding, and it must be in opposition with the clamping force. Mathematically, the clamping force formula that acts on an injection molding machine to cause it to close is calculated as;
Jan 20, 2019· Vmax: Shot size of injection molding machine; Vp : Volume of single product and gate, runner, sprue. II. Calculate follow clamping force of injection molding machine. To understand clamping force, you can see clamping force of injection molding machine N = SP/F F: Maximum clamping force of injection molding machine (N). P: Max inject pressure ...
Jul 30, 2020· How to Calculate Clamping Force for Injection Molding. Clamping force alludes to the force put into a mold by the unit of clamping of an injection molding machine. To keep the mold closed, this force must contradict the extrication force due to the injection of liquid plastic into the mold. Ordinarily, the force rating is stated in tons, e.g. a ...
Jun 25, 2019· Injection molding industry super handy little tool Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. The required clamping force can […]
Clamp Tonnage and Cavity Pressure Calculator The principle of pressure amplification also acts on the mold cavities. If we are running the screw and injection unit at 750 psi hydraulic we would get 750 x 14.52 or 10,890 psi leaving the nozzle and entering the mold. This force per
Apr 20, 2012· Injection molding machines are usually characterized by the tonnage of the clamping force that they provide. The clamping force, indicates the amount of force that the clamping unit can apply to the mold to keep it securely closed during the injection of the molten plastic, picture below shown injection machine from Nissei with type NEX80 (80 ton)