When quoting the prototype project, it is necessary to select the appropriate processing method according to the characteristics of the parts in order to complete the prototype project faster and better. At present, it is mainly engaged in prototype processing, CNC lathe processing, 3D printing, filming, fast molds, etc… Today we will talk about the difference between CNC lathe processing and 3D printing.
First of all, 3D printing is a material increase technology, and CNC lathe processing is a material reduction technology, so they are very different in materials.
1. Differences in materials
Three-dimensional printing materials mainly include liquid resin (SLA), nylon powder (SLS), metal powder (SLM), gypsum powder (full-color printing), sandstone powder (full-color printing), wire (D FM), sheet (LOM), etc. .. Liquid resin, nylon powder and metal powder occupy the vast majority of the industrial 3D printing market.
The materials used in CNC lathe processing are all plates, which are plate-like materials. By measuring the length, width and height of the parts + wear, the plates of the corresponding size are cut for processing. 3D printing is used for processing materials of CNC lathes. Generally, hardware and plastic plates can be processed by CNC lathes, and the density of the molded parts is higher than that of 3D printing.
2. Differences in parts due to the forming principle
As we mentioned earlier, 3D printing is a kind of additive manufacturing. Its principle is to cut the model into N layers/N multi-points, and then stack them layer by layer/point-by-point in order, just like building blocks. same. Therefore, 3D printing can effectively process and produce parts with complex structures, such as hollow parts, while CNC is difficult to realize hollow parts processing.
Numerical control is a kind of subtractive manufacturing. Through high-speed operation of various tools, the required parts are cut out according to the programmed tools. Therefore, CNC lathe processing can only have rounded corners of a certain arc, but can not directly process right angles, which can be realized by wire cutting/spark technology. External right-angle CNC numerical control lathe processing is no problem. Therefore, the internal right-angled parts can be considered to choose 3D printing processing and production.
It is also the surface. If the surface area of the part is relatively large, it is recommended to choose 3D printing. CNC lathe processing of the surface is very time-consuming, and if the programming and operating machine masters are not experienced enough, they cannot leave clear patterns on the parts.
3. Differences in operating software
Most of the 3D printing slicing software is easy to operate, even a layman can use the slicing software proficiently for a day or two under professional guidance. Because the slicing software is very easy to optimize, the support can be automatically generated, which is why 3D printing can reach individual users.
Numerical control programming software is much more complicated and requires professionals to operate it. People with zero foundation generally need to learn about half a year.. In addition, a CNC operator is required to operate the CNC machine.
Because programming is very complicated, a component can have multiple CNC machining schemes, and 3D printing will only place a small part of the processing time consumables, which is relatively objective.
4. Differences in post-processing
There are not many choices for 3D printing parts after processing, generally they are grinding, spraying, deburring, dyeing and so on.
After machining parts with CNC lathes, in addition to polishing, oil spraying, deburring, there are also electroplating, silk screen printing, printing, metal oxidation, laser carving, sandblasting, etc.