- The calculation formula for reasonable use of materials for sheet metal processing parts
- How to calculate the cost of sheet metal processing (how experienced sheet metal processing quotes are calculated)
- Common Calculation Formulas for Sheet Metal Processing
- The calculation formula for sheet metal processing rolled round
- Calculation formula of sheet metal processing pressed dead edge
- The calculation formula for sheet metal processing 90° bending
- The calculation formula for sheet metal processing non-90° bending
- Calculation formula of sheet metal processing segment difference
- Calculation formula for sheet metal processing bending compensation method
The calculation formula for sheet metal processing requires much attention, and there may be a few errors. Sheet metal processing belongs to a process, which is the processing of steel, aluminium and copper plates. Sheet metal processing can be folding, riveting, splicing, shearing, punching/cutting/composite, forming and so on, which are processed according to the customer’s needs. This article mainly includes the commonly used sheet metal processing process-related cost calculation methods.
The calculation formula for reasonable use of materials for sheet metal processing parts
In the production process of sheet metal processing parts, the reasonable use of materials can effectively reduce production costs and improve the competitiveness of enterprises. Experienced sheet metal factories will continuously optimize the material utilization rate and the method of reasonable material use.
(1) Material utilization rate of sheet metal processing parts
The material utilization rate can be calculated by volume ratio or mass ratio, but the area is the simplest. The formula for calculating the material utilization rate is as follows.
Η – material utilization rate, 100%.
N – the number of parts on the plate and pieces.
S1 – an area of a single part, mm2.
S – an area of the plate used, mm2.
(2) The method of reasonable material use for sheet metal processing parts
The material can be reduced, and a good set can improve utilization. For example, if the parts shown in Fig. 5-11(a) are laid out according to the first scheme shown in Fig. (b), only 6 parts can be nested, and the utilization rate of materials is 60%; if the second scheme shown in Fig. (c) is used, 9 parts can be nested, and the utilization rate of materials is 90%.
(1) The nesting of steel plates. Steel plate nesting has centralized under the row of nesting methods and parts of the whole method; see Table 5-19.
Concentrated under the method: the same material and the same thickness of the parts together, the overall arrangement, size with, make full use of.
The row of nesting method: according to the shape of the parts using straight row, pair of rows, single row, diagonal row, multi-row and other ways.
Parts of the whole spell method: in the case of process permitting, the use of small spells the whole structure.
(2) the method of profile nesting. The nesting of profiles is relatively simple, and the long-short matching method is used. Usually, the longer-size material is placed first, and then the shorter-size material is placed, and after strict calculation, the shortest remaining material is made.
How to calculate the cost of sheet metal processing (how experienced sheet metal processing quotes are calculated)
The manufacturing underwriting price of sheet metal is calculated by operating time.
Laser cutting $8/M per small hole at $1
CNC billing $5/Min
CNC bending calculation $1 per side double for large side
Cold work welding calculation is $ 70 per day, 50KG per day per worker as the basis
The above calculation method requires high comprehensive quality and an excellent understanding of industry dynamics, i.e. difficult to operate.
The following sheet metal calculations are empirical calculations that do not consider the manufacturing process.
Material price = Unfolded drop kilos x market material price
Processing cost calculation: without considering process, tax, overhead and freight
Baseline calculation: $3,200/T cold rolled sheet metal t = 2.0 1804-m Grade 7 IT7
Cold work processing cost: $8.0~8.4/KG, workers make more than 50KG per worker
Cold work includes the following: grinding machine cutting, old shear bed, old bending machine, flame perforation, old electric welding, and outsourcing price of $7.2~7.5/KG.
The above processing factor base is set to 1.
CNC shearing, CNC punching, CNC bending, CO2 protection welding, the outsourcing cost to take the coefficient 2.5 ~ 3.5, and according to the number of processes, complexity to consider the coefficient of taking up and down.
Laser cutting is 2 times punching.
When the plate is not equal to 2, the processing cost is calculated as equal to 2
When the plate is less than 1.2, the processing cost is multiplied by 2.5~3.5
When the market price of the material fluctuates, the processing cost base remains unchanged.
If the plate metal production is in full assembly, with no welding, the counting coefficient multiplied by 0.75 ~ 0.85 is generally large.
If the tolerance level is increased to 1804-f, the counting factor is multiplied by 1.5~2.
For batch cleaning of burrs, multiply the counting factor by 1.1 to 1.5.
The price of surface spraying is 20~30 USD/m2.
15~20 USD/m2 for the three-degree painting of the surface.
With special requirements, and manufacturing and processing difficulties, the finished product rate must be considered, and the finished product rate coefficient must be multiplied.
The above-approved price is the standard approved price; the scrap rate is within 3%, the profit is roughly 285%, and after deducting the tax, the profit is about 18#%. If there is a requirement for profit, the corresponding multiplication factor is added to the approved price, which should not be less than 1.75
Common Calculation Formulas for Sheet Metal Processing
The calculation formula for sheet metal processing rolled round
Calculated by internal dimensions: L+2π(r+0.4T)*θ/360, where the arc of the rolled circle can be measured and marked out directly in CAD. (θ is the angle of the rolled circle)
Calculation formula of sheet metal processing pressed dead edge
Bending compensation method: Calculated according to the inner dimension: L1+L2+L3+……+Ln+1.6T×n (n is the number of bending times)
Bending deduction method: Calculated by outer dimensions: L1+L2+L3+……+Ln -0.4T×n (n is the number of bending times)
The calculation formula for sheet metal processing 90° bending
Bending compensation method: Calculated by inner dimensions: L1+L2+L3+……+Ln+0.4T×n (n is the number of bending times)
Bending deduction method: Calculated by outer dimensions: L1+L2+L3+……+Ln-1.6T×n (n bending times)
The calculation formula for sheet metal processing non-90° bending
Calculated by internal dimensions: L1+L2+L3+……Ln+0.4T×(θ/90°)×n(n number of bends, θ is the angle of bending=180°-angle of the part)
Note: Non-90° bending can only be calculated according to the inner dimensions
Calculation formula of sheet metal processing segment difference
Straight edge segment difference (H≤3.5T)
Bending compensation method: Calculated according to the inner dimension: L1+L2+H (H is the height of segment difference)
Bending deduction method: calculated by the outer dimensions: L1 + L2 + H-2T (H is the height of the segment difference)
Bevelled segment difference (H≤3.5T)
Calculation formula for sheet metal processing bending compensation method
Calculated by internal dimensions: L1+L2+l+T (l is the height of the segment difference alignment mark)
Note: Non-90° bending can only be calculated according to the inner dimensions
When H>3.5T, according to the normal one positive and one negative two bending processes, not considered a segment difference
The above are some cost calculation methods related to sheet metal processes commonly used by ANPLLO. If you have questions, please message or contact us directly. If you need sheet metal processing cooperation, you can send drawings directly to our email or contact us online for cooperation.