Dive into CNC Technology: Operation Mechanics & Analýza nákladov

A quick introduction to CNC Technology

CNC (Počítačové numerické riadenie) technology is a cornerstone of modern manufacturing, enabling precise, automated machining processes across various industries.

CNC technology movements are based on the X, Y, a osi Z. The tool is positioned using stepper or servo motors,

which acts on the movements based on the code obtained from the original 3D model of the part you want to create – called the G-code.

Numerical controls describe how fast to move the spindle (the rotating part that spins the tool holder), which direction to move,

which tool to use (if the machine uses multiple tools and can switch between them), as well as other factors such as using coolant.

How CNC Machining Works？

CNC (Počítačové numerické riadenie) machining operates by translating design data from Computer-Aided Design (CAD) files into coded commands understood by a machine controller.

These commands instruct the machine tools on where and how fast to move.

Ten CNC obrábanie Spracovanie: From CAD to Parts

This process involves several steps:

• Návrh: Creating the part’s specifications with CAD software.
• Conversion: Transforming the design into G-code through CAM (Počítačom podporovaná výroba) softvér.
• Setup: Preparing the machine, setting up toolpaths, and fixing the workpiece in place.
• Obrábanie: Executing the programmed G-code on the material.
• Následné spracovanie: Finishing touches like deburring and surface treatment.

CNC Machining Materials

1. Metals in CNC Machining

Metals are among the most commonly machined materials due to their strength, trvanlivosť, and range of properties. Here’s a breakdown of the most frequently used metals:

Hliník

• Vlastnosti: Ľahký, odolný voči korózii, and easy to machine. It offers a good balance of strength and weight.
• Žiadosti: Letectvo, automobilové diely, electronic housings, a zdravotnícke pomôcky.
• Popular Alloys: 6061, 7075, a 2024 hliník.

Nehrdzavejúca oceľ

• Vlastnosti: Highly resistant to corrosion, zahrievať, and wear, making it durable even in harsh environments.
• Žiadosti: Zariadenia na spracovanie potravín, lekárske nástroje, chemical containers, and automotive parts.
• Popular Grades: 304, 316, a 17-4 PH.

Titán

• Vlastnosti: Exceptional strength-to-weight ratio, odpor, and high-temperature resistance.
• Žiadosti: Letectvo, lekárske implantáty, and automotive parts.
• Popular Grades: Známka 2 (commercially pure) and Ti-6Al-4V (zliať).

Mosadz

• Vlastnosti: Easy to machine with good strength and corrosion resistance. Brass also has excellent electrical conductivity.
• Žiadosti: Electrical components, príslušenstvo, a ozdobné časti.
• Popular Alloys: C360 (free machining brass).

Meď

• Vlastnosti: Excellent electrical and thermal conductivity, making it ideal for electronic components.
• Žiadosti: Electrical connectors, chladič, a radiátory.
• Popular Alloys: C110 (čistá meď) and C182 (chromium copper).

Odvoz

• Vlastnosti: A superalloy known for its ability to withstand extreme temperatures and high levels of stress without deforming or corroding.
• Žiadosti: Aerospace and gas turbine components, námorné aplikácie, a výmenníky tepla.
• Popular Grades: Odvoz 718 and Inconel 625.

2. Plastics in CNC Machining

Plastic materials are often chosen for CNC machining when lightweight, chemical resistance or electrical insulation is needed. Commonly used plastics include:

Absencia (Akrylonitrilbutadiénstyrén)

• Vlastnosti: Strong, tvrdý, and impact-resistant. ABS is easy to machine and widely used in various industries.
• Žiadosti: Automobilové komponenty, spotrebných produktov, and electronic housings.

Pomom (Polyoxymethylene or Acetal)

• Vlastnosti: High stiffness, nízky trenie, and excellent dimensional stability.
• Žiadosti: Výstroj, ložiská, and precision parts requiring low friction.

Nylon

• Vlastnosti: High strength and flexibility with excellent wear resistance.
• Žiadosti: Mechanical parts like gears, ložiská, and bushings.

Peek (Polyether Ether Ketone)

• Vlastnosti: High mechanical strength, chemický odpor, a tepelná stabilita, making it one of the most durable plastics.
• Žiadosti: Letectvo, lekársky, a automobilové komponenty, as well as electrical insulation parts.

Ptfe (Polytetrafluoroethylene or Teflon)

• Vlastnosti: Nízky trenie, chemický odpor, and high-temperature resistance.
• Žiadosti: Tuleň, gaskets, and non-stick coatings.

HDPE (Polyetylén)

• Vlastnosti: Durable, ľahký, and highly resistant to impact and moisture.
• Žiadosti: Nádrže, potrubia, and cutting boards.

3. Composites in CNC Machining

Composites are increasingly being used for CNC machining due to their high strength-to-weight ratio, odpor, a trvanlivosť. Some popular composite materials include:

Carbon Fiber-Reinforced Polymers (CFRP)

• Vlastnosti: Extremely strong, ľahký, and corrosion-resistant. Carbon fiber is often used in applications where both strength and weight reduction are critical.
• Žiadosti: Letectvo, športové vybavenie, and automotive parts.

Glass Fiber-Reinforced Polymers (GFRP)

• Vlastnosti: High strength and stiffness with excellent corrosion resistance.
• Žiadosti: Wind turbine blades, automobilové diely, and construction materials.

4. Ceramics in CNC Machining

Though less common, ceramics are used for their exceptional hardness, tepelná odolnosť, a odolnosť proti korózii. These materials are often chosen for specialized applications:

Alumina (Aluminum Oxide)

• Vlastnosti: Extremely hard and resistant to wear, zahrievať, a korózia.
• Žiadosti: Nástroje, electrical insulators, a zdravotnícke pomôcky.

Zirconia (Zirconium Dioxide)

• Vlastnosti: Excellent toughness, thermal insulation, a odolnosť proti opotrebeniu.
• Žiadosti: Dental implants, cutting tools, and high-temperature components.

How Much Does CNC Machining Cost?

CNC machining costs are influenced by a variety of factors, including material selection, design complexity, machining time, machine tool choice, objem výroby, labor costs, indirect costs, and scrap and rework.

Materiálové náklady

The type and cost of materials significantly impact CNC machining expenses.

High-performance alloys, such as titanium or stainless steel, are typically more expensive than plastics or softer metals.

Navyše, the machinability of the material influences costs, as more difficult-to-machine materials may require more time and resources.

Design Complexity

The complexity of part design directly affects machining costs. Complex geometries, tight tolerance requirements,

and special design features may necessitate advanced machining techniques and specialized tools, thereby increasing costs.

Machining Time

Machining time, which includes actual cutting time and setup time for tool changes and configurations, contributes to the cost.

Longer machining times lead to higher costs. Optimizing the machining process and enhancing production efficiency can reduce costs.

Machine Tools

The selection and management of machine tools significantly affect costs. The cost of cutting tools, their lifespan, and frequency of replacement all impact overall machining expenses.

Proper tool selection and maintenance are critical for cost control.

Volume and Batch Size

High-volume production can lower per-unit costs, as fixed setup costs are spread across more parts.

Small batch production may result in higher per-part costs due to the proportionally larger impact of setup time.

Mzdové náklady

The wages of skilled operators and engineers form part of CNC machining costs. Labor-intensive operations or parts with complex requirements may incur additional labor costs.

Indirect Costs

Indirect costs associated with CNC machining, such as facility expenses, utilities, and administrative costs, also influence the total cost.

Scrap and Rework

Effective quality control and inspection processes can minimize scrap rates and rework, leading to cost savings.

How to reduce/save CNC machining costs？

Reducing costs in CNC machining involves optimizing various aspects from design to execution.

Here are key strategies to help manage and decrease CNC machining costs effectively:

• Optimize Design to Minimize Complexity: During the design phase, avoid features such as thin walls, deep cavities, and sharp 90-degree corners, which can increase machining difficulty and costs.
• Select Appropriate Materials: Choose materials based on the functional requirements of the part, avoiding over-specification, and opt for materials that are easier to machine and less expensive.
• Limit the Depth of Cavities and Threads: Design with restricted cavity depths to reduce machining time and costs. Also, keep thread lengths minimal to avoid the need for specialized tools and added costs.
• Increase Wall Thickness: Thicker walls can improve machining stability and reduce costs. For metal parts, the suggested minimum wall thickness is greater than 0.8 mm, and for plastics, it’s more than 1.5 mm.
• Use Standard Tool Sizes: Design parts compatible with standard CNC tool sizes to minimize tool changeovers and machining time.
• Avoid Excessive Tolerances: Unless absolutely necessary, avoid defining tight tolerances, which can increase machining complexity and costs.
• Leverage Batch Production: Larger order quantities can spread fixed costs over more parts, lowering the cost per unit.
• Minimize Surface Finishing: Unnecessary surface treatments can add to the cost, so they should be determined based on the actual needs of the part.
• Invest in Automation and Technological Innovation: Spending on robotic automation and modern CNC technologies can enhance efficiency, reduce labor costs, and improve production quality.
• Optimize Machining Parameters: By fine-tuning parameters such as cutting speed, feed rate, and spindle speed, you can maintain quality while reducing energy consumption and costs.

Types of CNC machines

CNC (Počítačové numerické riadenie) machines come in a variety of types, each designed for specific functions in manufacturing. Here are the key types:

1. Mletie Machines: Used to remove material from a workpiece using rotating cutting tools. They can produce complex shapes and high-precision parts with multiple axes (až 5 osi).
2. CNC sústruhy: Specialize in producing cylindrical parts by rotating the workpiece while a stationary cutting tool removes material. They are ideal for crafting symmetrical components like shafts and fittings.
3. CNC Plasma Cutters: Use plasma (a high-temperature ionized gas) to cut through metals like steel, hliník, a mosadz. They’re typically used in fabrication shops for cutting sheet metal.
4. CNC Laser Cutters: Utilize a focused laser beam to cut or engrave materials with high precision. They are perfect for intricate designs and are often used in industries like aerospace and electronics.
5. CNC routery: Designed for cutting, carving, and engraving materials like wood, plasty, a mäkké kovy. They are commonly used in cabinetry, znamenie, and architectural modeling.
6. CNC Grinders: Employ abrasive wheels to finish surfaces or achieve a fine finish. These machines are essential for achieving high-tolerance parts in industries like automotive and aerospace.
7. CNC Electric Discharge Machines (EDM): Utilize electrical discharges or sparks to shape metals by eroding material from a workpiece. They are ideal for creating complex cavities or shapes in hard materials like steel.
8. CNC Waterjet Cutters: Use high-pressure water (often mixed with abrasives) to cut materials. Waterjets are used for cutting various materials, vrátane kovov, plasty, and stone, without generating heat.

CNC Machining Center vs. Ordinary CNC

CNC machines have revolutionized manufacturing, and there are distinct categories like CNC machining centers and ordinary CNC machines.
While both offer precision, automatizácia, Účinnosť, they serve different purposes and functions in the manufacturing process.
Let’s break down the key differences between a CNC machining center and an ordinary CNC machine.

1. Definition and Functionality

• CNC Machining Center: A CNC machining center is an advanced, multi-functional machine designed for a variety of operations such as milling, vŕtanie, tapping, and boring, all in a single setup.
  It is highly automated and equipped with a tool magazine for automatic tool changes, making it ideal for complex parts and multi-step manufacturing processes.
• Ordinary CNC Machine: Typically refers to basic CNC equipment like CNC lathes or mills that focus on specific tasks (Napr., otáčanie, mletie).
  These machines are generally more limited in functionality, capable of performing only one or two operations at a time, with fewer automated features.

2. Tool Capacity and Changeability

• CNC Machining Center: Comes with an automatic tool changer (ATC) that allows for multiple tools to be swapped out during operations without manual intervention.
  This feature enables the machine to perform a wide range of tasks in a single setup, drastically reducing downtime and increasing production efficiency.
• Ordinary CNC Machine: Most ordinary CNC machines require manual tool changes, especially lower-end models.
  While they provide precise machining, the lack of an ATC limits versatility and requires more frequent operator involvement, slowing down multi-step processes.

3. Workpiece Complexity

• CNC Machining Center: Ideal for highly complex workpieces that require multiple machining operations.
  These machines can handle intricate geometries, angled surfaces, and deep cavities, making them essential for industries such as aerospace, automobilový, a výroba zdravotníckych pomôcok.
• Ordinary CNC Machine: Best suited for simpler parts and operations that do not require multiple machining steps.
  These machines are effective for less complicated tasks such as turning, simple milling, or cutting.

4. Axes of Movement

• CNC Machining Center: Usually includes multi-axis capabilities, such as 3-axis, 4-osi, or even 5-axis machining.
  This allows for more flexible and dynamic movement, enabling the production of complex parts without having to reposition the workpiece multiple times.
• Ordinary CNC Machine: Generally operates on fewer axes, such as 2-axis or 3-axis.
  While still precise, these machines are more limited when it comes to creating parts with complicated geometries or multiple features.

5. Automation and Efficiency

• CNC Machining Center: Highly automated with minimal operator input, capable of running continuous production cycles.
  The integration of ATC and multiple axes significantly increases the efficiency of machining processes.
• Ordinary CNC Machine: Requires more manual intervention, especially when it comes to tool changes or switching between machining operations.
  While efficient for specific tasks, the overall automation and productivity are lower compared to machining centers.

6. Žiadosti

• CNC Machining Center: Widely used in industries where complex parts with high precision are required, ako napríklad letectvo, automobilový, and high-tech manufacturing.
  The ability to perform multiple operations in one setup saves time and reduces errors.
• Ordinary CNC Machine: Suited for industries that require simpler, less complex parts, such as general mechanical components, basic fittings, a hriadele.
  These machines are a good fit for small workshops or tasks where the level of complexity doesn’t justify the use of a machining center.

Factors Affecting the Price of a CNC Machine

• Technológia
• Materiálové náklady
• Production Costs
• Configuration
• Brand and Quality Assurance
• After-Sales Service

The Complete CNC Machine Price Guide – In Every Price Range

The cost of a CNC machine can vary widely, ranging from a few hundred dollars to several tens or even hundreds of thousands of dollars.

This significant price range is influenced by various factors, including the type of CNC machine, its size and rigidity, power and torque capabilities, the number of axes, and additional features.

 

CNC stroj	Price
Hobby-Level CNC Router	$200 - $3000
Professional CNC Router	$3K – $10K
Industrial CNC Router	$40K – $200K
Production CNC Router	$200K – $400K
Hobby-Level CNC Mill	$2K – 7K
Professional CNC Mill	$7K – $50K
Industrial 3-Axis Mill	$60K – $100K
Industrial 5-Axis Mill	$200K – $500K
Production Mill (Vertical Machining Center)	> $500K
Hobby-Level CNC Lathe	$2K – $12K
Professional 2-Axis CNC Lathe	$15K – $50K
Industrial 2-Axis CNC Lathe	$60K – $100K
Production CNC Lathe (Horizontal Machining Center With 7-13 Axes)	> $500K