CNC Machining Services for Metal Parts in China

Manufacturing revolves around the machining of metal parts, a fundamental process that transforms raw materials into precision components. With the rise of global manufacturing, Chinese CNC machining service providers have become major players in the production of these crucial parts. Understanding the complexities of metalworking is essential for companies seeking to obtain high-quality parts at competitive prices.

Metalworking is a process of altering the dimensions and properties of components made of alloys to create parts with desired sizes and shapes. This process has various types, primarily distinguished by the type of material being worked (e.g., metal alloys are typically used in milling) and technical characteristics (e.g., milling is generally more efficient at material removal than plastic machining). Furthermore, the type of tools used is also a significant factor affecting the machining outcome.

Metalworking operations are widely accepted and can be broadly categorized into the following main types:

• Milling: Removing material using a rotary cutting tool to form a desired shape.
• Grinding: Removing material using abrasives, typically used to improve surface finish.
• Waterjet Cutting: Cutting material using a high-pressure stream of water; suitable for a variety of materials.
• Turning: Removing material by rotating the workpiece and using a fixed cutting tool; divided into conventional and Computer Numerical Control (CNC) turning.

• Bending: Changing the shape of plastics to meet specific needs.
• Stamping: Cutting plastic materials into specific shapes using dies.
• Stretching: Forming films or molded parts by stretching plastic materials.
• Forging: Shaping plastic materials by applying pressure.

• Annealing: Reducing the hardness of materials through heating and slow cooling, improving machinability.
• Saturated Element Treatment: Changing the microstructure of materials through heat treatment to enhance their properties.

Each metalworking process produces metal parts with different properties and shapes:

Focuses on the degree of material removal, resulting in parts that are typically much lighter than the original material block and possess the desired shape. These parts are custom-made to meet specific customer requirements and can satisfy the needs of various applications.

Allows changes in the shape of the part (such as stamping and bending) without altering the initial volume of the object. This means that the mass remains unchanged or nearly the same before and after plastic processing, suitable for applications where maintaining material volume is crucial.

The main purpose is to impart additional predefined characteristics to the object. For example, annealing can increase the hardness and rigidity of machined metal parts; while anodizing is commonly used on aluminum to improve surface finish and corrosion resistance.

The overall characteristics of metalworking can be described using another term: material removal. At its core is the removal of excess material until the part reaches the desired shape and dimensions. Currently, we can identify three main types of metalworking:

• Milling (performed on automatic or CNC machine tools)
• Turning (also automatic or CNC operation)
• Grinding (also automatic or CNC operation)

The machining of metal parts changes the shape of the raw material by removing material—for example, milling machines use cutting tools to cut the material. Due to the wide variety of tools available, modern milling machines can remove large amounts of material in a short time.

Furthermore, milling can be classified according to the direction of the cutting face as circumferential milling and facing milling, and according to the direction of the workpiece as opposing milling and facing milling. It is worth noting that milling (especially milling performed by computer numerical control) can produce parts of almost any shape and form.

Turning, a type of milling machining, works by removing excess material from a rotating workpiece using a specialized cutting tool (tool head or drill bit). This metalworking method can be categorized based on the direction of tool movement (i.e., the surface of the workpiece) into external turning (usually the mainstream method—the tool moves on a specific support) and internal turning (sometimes called "boring"—the tool moves inside the workpiece). Grinding is often considered one of the final steps in part machining, resulting in a smoother surface while also removing a small amount of material.

It's worth noting that what we call "metalworking" can be performed using manually controlled tools (such as traditional machine tools) or computer-controlled tools (called "CNC machining").

1. Q: Are you a trading company or manufacturer?
   A: We are a factory.
2. Q: How can I obtain a quotation?
   A: To receive a quotation, please send us drawings in formats such as IGS, DWG, STEP, etc., along with a detailed PDF. If you have any specific requirements, please include them in the request, and we will provide professional advice for your reference.
3. Q: What if I don't have a drawing?
   A: In such cases, you can provide us with samples or drawings. Rest assured, we will ensure the safety and confidentiality of any provided drawings.
4. Q: What is your delivery time?
   A: Normally, it takes 7-14 days for the parts to be ready. We have systems in place to ensure timely delivery.
5. Q: How do you ship the products? What are the packing details?
   A: For small quantity orders, we have partnerships with courier services like TNT, FEDEX, UPS, etc. For larger quantities, air or sea shipment options are available. We have standard packing details, but if you have any specific requirements, we are willing to assist you.
6. Q: Do you provide samples? Is there an extra charge?
   A: Yes, we can provide samples, but there may be an extra charge for them.
7. Q: What are your payment terms? How can I make the payment?
   A: Our payment terms are 50% T/T (bank transfer) in advance, with the balance payment due before shipment. If you have any other questions, please feel free to contact us.