Table of Contents
What is tonnage in injection Moulding?
The “tonnage” is the measure of force that is required to keep the tool closed during the injection process. This force is the main factor in determining the injection molding machine size required for producing the part.
How do you calculate shot weight in injection molding?
Let’s assume we have a shot weight of 40.6 gms. Thus, we can calculate volume as mass/density, which will be (40.6/1.52)= 26.71 cube centimeters. To calculate the injection stroke or shot size, we can put all values in the formula of shot volume, i.e., Shot Volume = π x r2 x Shot Size.
How do you calculate MHR for injection molding?
The machine hour rate is similar to the labour hour rate method and is used where the work is performed primarily on machines. If factory overhead is Rs 3, 00,000 and total machine hours are 1,500, the machine hour rate is Rs 200 per machine hour (Rs 3, 00,000 ÷ 1500 hours).
How is projected area mold calculated?
Mold Clamping Force Formula (F: tf) The total projection area is the total of the projected areas of the cavities and runners in relation to the parting surface. Therefore, this value varies depending on the number of items molded and on the runner layout. 400 × (16.0 + 5.0) ÷ 1000 = 8.4 (tf).
What is machine tonnage?
The “tonnage” is the maximum of clamping force that a injection molding machine can offer to keep the the injection tool tightly closed during the injection process. This clamping force ensure the mold won`t apart or getting loose and having products with sharps.
How do you calculate the size of Mould?
Multiply the number of fluid ounces of water by 1.8 to get the total cubic inches of the mold. For example, if your mold holds 12 ounces of water, 12 X 1.8 = 21.6 cubic inches. 21.6 cubic inches in the mold X 0.4 = 8.64 ounces of oils in that recipe.
How do you calculate Mould size for a plastic component?
The first step in determining appropriate clamp tonnage is to calculate the surface area of the part. This simply means getting the square inch area of the cavity by multiplying the length by the width. If it is a multi-cavity mold, multiply the number by the number of cavities.
How do you calculate MHR?
Machine hour rate is obtained by dividing the total running expenses of a machine during a particular period by the number of hours the machine is estimated to work during that period.