Formula for the volume of a rectangle or square for mold making – Volume = Length x Width x Height * The data above is according to the experience. This is a Volumetric Calculation. Calculation for mould volume. This calculator is designed to give the approximate values and identify the conditions that would allow condensation to form, leaving vulnerability for mold, mildew or rot. clamping force = clamping force constant x projected area of ​​the product. For every inch of depth over one inch, we need to increase the clamping force calculation by 10%. Kry January 21, 2017 at 7:35 am - Reply. To get the amount of oils, multiply that number by 0.4, Designed by Elegant Themes | Powered by WordPress. To get the amount of oils, multiply that number by 0.4 This paper analyzed the price composition based on the standard man-hour method of plastic mould. Injection Molding 2. It`s not for precise calculation. For a more accurate calculation contact your moulding machine supplier. Assuming we need 2 m 3 of concrete for M20 Concrete Mix, (Mix Ratio, M20 = 1 : 1.5 : 3) Total Part of the Concrete = 1+1.5+3 = 5.5 Parts. 9 x 12 x 1.25 = 135 x 0.4 = 54 ounces of oils. However, as the market becomes more and more subdivided, the clamping force of the machine can no longer fully evaluate the size of the machine, and more and more special machines have begun to appear. W: The total amount of shot weight (the weight of a single product x the number of points + the weight of the nozzle) V: Maximum injection speed of injection molding machine (grams/second) t: a driven time for the screw to start and stop. P=350bar*S(cm^2)/1000. For a new part you need to consider how well the mould cooling can be. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. As shown in the picture is a round PC plastic lamp holder, its outer diameter is 220mm, the wall thickness range is 1.9-2.1mm, and it has a pin-shaped center gate designed. For other groups of plastics, we should multiply the corresponding multiplication constant K. (3) Determine the numerical value of PC cavity pressure. Use the following calculator to get an estimate of the tonnage required to mould a rectangular or round part. The figure provides the relationship between cavity pressure and wall thickness and process/wall thickness ratio. Extruder Mold Pressure Inject Pack gate solidifies Extrude Solidify part solidifies Open Mold Eject Part Close Mold 1. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Use this calculator to find the number of parts produced per hour given cycle time & number of cavities in the mould. If you would prefer grams simply multiply the ounce measure by 28.35. For the water amount, I use twice the amount of lye. Example: Your part … Therefore, the clamping force is the main parameter to measure the machine, but when judging a machine, it depends on the comprehensive evaluation of other parameters. The interfaces of injection moulding parameters are created by using the graphics in Microsoft Visual Basic 2008. From the figure, it can be seen that the wall thickness of 1.9mm, and the cavity pressure of the injection piece with the process/wall thickness ratio of 105:1 is 160 Bar. The screw can be thicker, the thread can be deeper, the mold opening distance is larger, and the mold opening and closing speed is slower. For example, when I produce thick-walled products, I need a large amount of glue and a small clamping force. The rigidity of the injection molding machine template is higher. To get the amount of oils for your recipe, multiply that number by 0.4, Example: width: 9″ length: 12″ height: 1.25″ Learn how to calculate mold material needed for any project. Concrete Ingredients Calculation. All of the following and more are other variables that can greatly change the injection moulding cycle time: number of cavities in the mould The clamping force calculation of the injection molding machine is a compulsory course for all the injection molding engineers. So choose a 150T injection molding machine will be okay. The cavity pressure is affected by the following factors, (4) The viscosity characteristics of the plastic used, 3.1 Grouping of flow characteristics of thermoplastics. Pi = 3.14, radius is half the diameter (width across the circle). we do need calculation Assistance in our mold design, but I have to thank for sharing your experience. The calculation gives you the volume of the container in cubic inches, which you then multiply by 0.4 to get the total amount of oils needed. If the clamping force is too small, it will cause the product to have flash or lack of material. , The clamping force should be high, the screw should be small, the opening distance should be small, and the opening and closing distance should be fast. Use CAE software to calculate the clamping force (MOLDFLOW, etc.). The mold plate of the injection molding machine can be slightly rigid and the clamping force can be small. Please send me the excel calculator. Your Message As in the above application, The injection molder clamping force should be 350*410/1000=143.5T. Generally, the cavity pressure inside the mold is within the range of approximately 300 to 500 kgf/cm 2. Pi = 3.14, radius is half the diameter (width across the circle). At the end of the project, the Mould Calculations Software is created. In the past, the clamping force of large machines was large, and that of small machines was small. This is the traditional way of thinking. Using the inside dimensions of your mold, multiply the width by the length, then multiply that number by the height or thickness you want your soap to be. This is different from the design idea of ​​a traditional machine. This calculation formula is the most precise clamping force calculation for injection moulding without professional software that works on the computer. Mold Making and casting is a very satisfying activity. Basic Formula of Shrinkage D' = D x(1+shr) with D' is dimension after shrinkage D is dimension before shrinkage shr is shrinkage (in persen %) so to calculate shrinkage we can use formula shr = (D'/D)-1 from this basic formula we can develop by substitute with other formula The clamping force of the injection molding machine, also known as the clamping force, is the key to the molding of injection products. CRITIQUE OF OUR MOLD-FILLING CALCULATION Our calculation was fairly nasty, yet we made so many assumptions that the calculation is … Example would be pen barrels w/o core cooling. Clamping Force Calculation Formula 2:  Empirical formula 2. Therefore, Cement Quantity = (Cement Part / Concrete Parts ) * Concrete Volume Fill in the remainder of the of the soap calculator and hit calculate. For the example above: 54oz x 28.35g/oz = 1530.87g Or rounded properly: 1531g of oils. The largest melt flow resistance occurs at the thinnest wall thickness (ie 1.9mm), so the value of 1.9mm should be used when calculating the required injection pressure. The formulae of injection moulding parameters are input into the software, in the form of computer coding. Empirical formula: the core idea-to calculate the clamping force through the clamping force constant, Calculation formula: If the bore size is 2 inches; rod size 1 inch and the stroke is 20 inches and our available core circuit oil volume It seems that clamping force is the main indicator to measure the size of the machine. The projected area (S) is the largest area viewed along the opening and closing of the mold. This is for the free Quick Steel Weight and Cost Calculator. For a round mold, such as a PVC pipe, the volume can also be calculated by using this formula: Pi x radius x radius (again) x height. Below we will explain how to calculate clamping force with 4 clamping force formula one by one. Mould material costs can be calculated by mould size and material prices. For a small fee the molder will shoot your desired resin into the mold and then use the parts to calculate a precise shrinkage for your material in a similar profile to your product. Custom Injection Molding part cost calculator. (1) Calculation of process/wall thickness ratio, Process / wall thickness = the longest process of molten material / the thinnest part wall thickness = 200mm/1.9mm=105:1, (2) Application of cavity pressure/wall thickness graph. mold cost is a very important factor for every mold project. The relative viscosity grades of each group of plastics are as follows: 3.3 The cavity pressure is determined by the ratio of wall thickness, process and wall thickness, Look up the table and get P0•P=P0•K (multiplication constant), For example injection application:   clamping force calculation of how big machine it will need for polycarbonate (PC) lamp holder. Mold Clamping Force Formula (F: tf) p (kgf/cm 2 ): Cavity pressure inside the mold. Tell: +86-139 2617 0572. Above are 4 methods to calculate the clamping force for an injection molding machine. Reduce the cycle time by just 1 second to see how many moreparts can be made per hour. Cindy December 6, 2016 at 1:59 am - Reply. 1) empirical formula: Mold locking force = average pressure per unit area of forming space projection area of forming space coefficient =330kg/cm length of finished product width of finished product 1.5. It is often easier to change them all to the same unit before starting. Add a little extra for hang-up. Clamping Force Calculation Formula 2: Empirical formula 2. Chvorinov's rule is an applied physics relationship first expressed by Czech engineer Nicolas Chvorinov in 1940, that relates the solidification time for a simple casting to the volume and surface area of the casting. (4) Projected area value of PC lamp holder, S=π×Lamp holder outer diameter 2/4=3.14×22×22/4 (cm2)=380cm2. Plaster Mold Volume Calculator. Deane September 2, 2015 at 11:39 pm - Reply. Note: 1. Injection Mould = (6~10)*material cost Forging mould, plastic mould = 6*material cost Die-casting mould = 10*material cost Injection Mould Quotation Estimate. The main basis for the classification of injection molding machines is the clamping force. As in the above application, The injection molder clamping force should be 350*410/1000=143.5T. If the depth of the part is greater than 1 inch, we have to factor this into our calculation. Hydraulic Speed Calculator Calculation of cylinder extend & retract time (unscrewing core coupled with rack & pinion system in mold). 1. Office: Room 404, Longxin mansion, No.500 LongXi Road, Liwan District, Guangzhou, China Ti=W/20~50%V + t. Ti: total injection molding cycle time. This calculator is to be used as a guide and the results are not guaranteed. There and many injection molding machine tonnage calculation formulae. The more parts made per hour the lower the partcost. Keep records so that wastage can be kept to a minimum. There are 2 simple clamping force formula and 1 precise clamping force formula we mostly used in daily working. A (cm 2 ): Total projection area. For a round mold, such as a PVC pipe, the volume can also be calculated by using this formula: Pi x radius x radius (again) x height. Formula for a Square/Rectangle Mold: Length x Width x Height Example: You have a mold box that needs to be filled up 9" x 4" x 2" = 72 cubic inches in order to completly cover your original/part. So a 150T injection molding machine should be okay for this application. Always take care to use the same units in a calculation. Factory: B1 Intelligent Industrial Park, Hongling Road, Nanhai, Foshan, Guangdong,China 528000, Clamping Force Calculation for Injection Molding Machine, Alleycho Precision Mold Technology Co., Ltd, Cycle Time Calculation for Plastic Parts Injection Molding, PCO Neck Finish and Difference between PCO1881 & PCO1810, Plastic Recycling Symbol on Plastic Products, Key Technologies for PET Preform Injection Molding, Guidelines for How to Choose a Plastic Mold Maker in China, Alleycho Will Visit Arabplast Dubai during 5th~8th Jan 2019. kp=clamping force constant (t/cm2), Home → Injection Molding → Clamping Force Calculation for Injection Molding Machine. The unit of length and width of the finished product is cm; 2. Too big clamping force will result in a waste resource and will cause premature aging of hydraulic components and mechanical structure wear. Projection area 2． Cavity pressure. The above two clamping force calculation formula are rough calculation methods, the following is a more accurate calculation method: There are two important factors to calculate the clamping force: 1. Let’s talk about the calculation method of the clamping force in injection molding. This formula is used to calculate the force required to clamp the mold halves during injection molding. Compared with the first group, the viscosity of PC is 1.7-1.9 times of theirs, and the different viscosity is reflected in the cavity pressure, so the cavity pressure for the production of PC lamp holders should be 160bar×K (PC viscosity grade), P=160×1.9bar=304bar For safety reasons, we take 1.9 times. Back to Top. Measure the inner dimensions of the mould and calculate. For example, when we make PVC, PA, PS products, the screw design has its own characteristics. Volume of a block : Length x width x height Romany September 5, 2015 at 4:28 am - Reply. Plug that number into a lye calculator (I like SoapCalc), along with the oils & percentages, and you will have your recipe! This calculator is useful for calculating the volume of epoxy resin to mold or encapsulate an object in a rectangle or to calculate the amount of silicone needed to make your own mold. So, for a 3-inch PVC tube mold that is 6 inches high, the calculation is: 3.14 (Pi) X 1.5 (radius) X 1.5 (radius) X 6 (height) The volume of any cylinder is calculated using Pi X radius X radius X height. Each of the above groups of plastics has a viscosity (flowability) grade. We had prepared an excel format clamp tonnage calculator for the injection moulding machine tonnage calculation. thanks for sharing your experience on this issue, actually For the calculation of mold cost, each mold company has it’s own cost accounting. the cottles used to surround the model being molded). memo. * Above plastic viscosity the most pick up value for experience injection machine`s tonage calculation. There is no generic formula for this and wall thickness is only one of many variables. Now using the same formula subtract the cubic inches (volume) of your part. Thank you! At this time, the design is different. For Cement, Sand and Coarse Aggregate. The longest flow of parts is 200mm. mould design calculation [free download] mould design calculation design and development of mould calculation software ... manual calculation for injection moulding operation is time consuming and intends to make a miscalculation because of many parameters that need to be considered. This does not refer to the thickness of the wall, but to the total depth of the part. These conditions can occur anytime and anyplace, even in the arid desert (where we are) if conditions such as swamp coolers are present. p=clamping force (t); You can fill below contact form and get it free. Depending on the customer's request, the requirements determine the materials selection and heat treatment process; Theoretical Metal Weight Calculation Formula (30 Types of Metals) Metals & Materials / 3 minutes of reading If you’re working in the metalworking industry, even you’re engineers, you will try to find one calculator to help you calculate the weight of various metals and steels including ms plate, gi sheet , structural steel, ms angle, mild steel, steel bar, square tube, angle, aluminum etc. It should be noted here that all The data are all using the first group of plastics. The production of precision products requires very high equipment repeatability. Mold spring categories include extra light load (yellow), light load ( blue), medium load ( red), heavy load (green),extra heavy load （ brown). But when I make thin-walled products, I need high clamping force, small melt volume, small mold opening distance, and short cycle time. Once you have used the calculation for mold volume to determine how much oil your recipe will need, you simply put that number into section 2 of SoapCalc and then input the percentages of your oils in the recipe into sections 6 and 7. There are 4 clamping force calculation formulae to calculate the clamping force of an injection molding machine: Clamping Force Calculation Formula 1: Empirical formula 1, Clamping force (T) = Clamping force constant Kp*product projected area S (CM*CM).