A Method for Calculating the Cost of Turned Parts

Cost of turning parts

Due to the development of science and technology, the machinery for turning parts and components has changed a lot. From the traditional manual ordinary turning machinery (referred to as "ordinary lathes") to automatic turning machinery with cam mechanisms (referred to as "automatic lathes") and computer numerically controlled turning machinery (referred to as "CNC lathes" or "computer lathes"). These changes have greatly improved the overall machining accuracy, machining speed, and product consistency of the machined parts. Different types of turning equipment will have different costs for the same turning parts, so there will be different prices. Therefore, it is also a critical step to find suitable machining, which requires engineers who estimate the price of parts to have a high understanding of the processing machinery and the processing technology of the product. Reasonable manufacturing cost also has strict quality control standards.

No matter what kind of turning machine is used for processing, the price of turning parts can be easily calculated. The price of turned parts is calculated as follows: material cost + processing cost + post-processing cost (heat treatment, surface treatment, etc.) + packaging cost.

Cost of turning materials

The first item is the cost of materials, which is a very physical problem. Calculate the volume of the material required for the part and multiply it by the density of the material (the density of different materials is different, and the information is available online), and you will get the weight of the material to be processed. Then, according to the formula (component weight * material unit price = component material cost), the material cost of a single component can be obtained. This cost will not vary greatly in the valuation of different companies.

Machinist machining expenses

The second item is the processing fee, which requires the professional level of the appraisal engineer. The biggest difference in product valuation between companies is the processing fee. An appraisal engineer needs to understand the drawings of the parts to be processed, the processing technology of the products, the processing characteristics, and the advantages of various turning machine tools. Because different turning machine tools have different levels of processing accuracy and processing efficiency, the same process on different turning machine tools has different processing costs. The following is an estimate of the processing cost of parts from the lathe and the machining technology of the parts.

Calculate the price of turning parts

The first step is to choose a suitable turning machine (known as a lathe) to process the parts. Ordinary manual lathes have an advantage in quotation for parts with small quantities (such as single or several pieces) and without complex revolved surfaces. Due to their high processing efficiency, automatic lathes have a price advantage for large quantities of parts with small turning diameters and low precision requirements. For parts with large quantities, large size, and required precision, they can only be processed by CNC lathes. With such fierce competition nowadays, it is difficult to receive orders with high quotations. Therefore, choosing the right machine tool to process the parts will give a head start on the quotation.

Scientific processing technology of parts

The second step is that the process of machining parts should be reasonable, which has a lot to do with the technical level of the technicians operating the machine tools. It requires skilled programming technicians, fast programming, and reasonable process arrangements for different materials: reasonable processing lines (known as tool passes), fewer empty tool paths, suitable tools, and reasonable coordination of processing machine speed and feed for different raw materials. The combination of these elements will greatly improve the processing efficiency of the machine tool, and the quality of the product can also be guaranteed. Therefore, skilled machinists in the factory are another important factor in the competitive quotation of parts.

Whether it is a suitable lathe or a more skilled programming technician, it is all to reduce the processing time of parts. Because the processing cost is based on time, the general company's turning cost is 45 to 60 RMB per hour. Therefore, by estimating the processing time, the processing fee can be estimated. For example, to machining a CNC part, the clamping time is 0.5 minutes, and the processing time is 4 minutes. The company's charging standard is 1 RMB per minute (60 RMB per hour), so the processing cost is estimated to be 4.5 RMB.

Aftertreatment cost of parts

The third cost is post-processing cost, including heat treatment cost, surface finishing cost (electroplating, electrophoresis, anodizing, powder spraying, painting, QPQ, etc.), logo printing, etc. This fee is determined according to the customer's requirements; some have it, some don't. Regarding this fee, you can learn about some quotation benchmarks in the relevant industry. Heat treatment is generally priced by weight. There are two pricing methods for surface treatment: one is based on weight, and the other is based on the surface area of the parts. Generally, whichever of the two pricing models has the higher price will be used as the quotation for surface treatment.

The above briefly introduces the quotation estimate of cutting parts (turned parts), and some companies also add some management fees, profits, etc. This algorithm is generally the algorithm of large companies and is a bit more complicated. The difference from the simple quotation estimation algorithm is the calculation of processing costs. A simple estimation is to count these costs in the processing costs.

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