High Accurate VMC640 Vertical Machining Center Cnc Milling Machine

Core Characteristics of the VMC640 Machining Center

The VMC640 is a very classic and versatile Vertical Machining Center (VMC). Its model is typically interpreted as: VMC (Vertical Machining Center), 640 (generally refers to an X-axis travel of 600mm and a Y-axis travel of 400mm, though some manufacturers may define it as 700mm or 800mm; '640' is a common generic model name).

It is a workhorse for machining small to medium-sized parts and is extremely widely used in industries such as mold & die, precision parts, automotive, aerospace, and 3C.

Core Features of the VMC640 Machining Center

I. Structural Layout and Rigidity Characteristics

1. C-Frame Structure

   • This is the most common structure for vertical machining centers. The spindle head moves along the column (Z-axis), offering good rigidity and easy accessibility for operation.

   • Base components like the bed, column, and table are typically made of high-strength cast iron and undergo artificial aging treatment to effectively relieve internal stresses, ensuring long-term stability and accuracy retention.

2. High-Rigidity Guideway System

   • Mainstream configurations use linear guideways from Taiwanese/Japanese brands to achieve high-speed movement and low friction.

   • Some models emphasizing heavy-duty cutting capability may opt for box ways or a combination of linear guides and hard ways to balance rigidity and speed.

3. Precision Ball Screws

   • The three axes are usually driven by precision-grade ball screws with pre-stretching at both ends to minimize the impact of thermal expansion on accuracy.

   • The screws are directly coupled to the servo motors via couplings, ensuring high transmission efficiency and fast response.

II. Performance and Configuration Characteristics

1. Spindle System

   • Speed Range: Typically equipped with a 8,000 - 12,000 rpm servo spindle, capable of handling most materials from steel and cast iron to aluminum alloys.

   • Drive Method: Powered by a high-power AC servo spindle motor via a synchronous belt or gear drive, providing good low-speed torque and high-speed power.

   • Core Components: Utilizes high-speed, high-precision spindle bearings from Taiwanese/Japanese brands and is equipped with an oil cooler for forced spindle cooling, effectively controlling thermal deformation and ensuring stability for high-precision machining.

2. Tool Magazine System

   • This is one of the signature features of the VMC640. The most common types are disc-type (umbrella) magazines or carousel-type (arm-type) magazines, with a capacity typically of 16, 20, or 24 tools.

   • Tool Change Method:

     • Disc-type: Simple structure, low failure rate, but relatively slower tool change speed (usually 7-10 seconds).

     • Carousel-type: Faster tool change speed (usually 2-3 seconds), higher efficiency, and the mainstream choice for modern machining.

3. CNC System

   • Commonly equipped with mainstream domestic and international CNC systems, such as:

     • Japan's Fanuc: Extremely high stability, dominant in the market.

     • Germany's Siemens: Powerful functions, particularly advantageous for complex surfaces and 5-axis programming.

     • China's GSK, HNC, etc.: High cost-effectiveness and good localized service.

4. Axis Travel and Table

   • Typical Travel: XYZ ≈ 600*400*500 mm (varies by manufacturer).

   • Table: Usually a T-slot table, sized to match the travels, with strong load-bearing capacity.

III. Technical Advantages and Application Characteristics

1. High Precision and High Stability

   • Through quality manufacturing and assembly, coupled with laser interferometer error compensation, it typically achieves positioning accuracy within ±0.005mm and repeatability within ±0.003mm.

   • Fully enclosed guards prevent coolant and chip splash, ensuring a safe and clean working environment.

2. Wide Machining Adaptability

   • Capable of performing various operations like milling, drilling, tapping, boring, and contouring, allowing for multi-side machining in a single setup.

3. High Cost-Effectiveness and Low Maintenance Cost

   Specification data

    

    

   • As a mature model, the VMC640 has a large market presence, readily available spare parts, relatively low maintenance costs, and offers high overall value.

   • 

   Specification of vertical machining center
   Item	VMC640	VMC850	vmc855	VMC1060
   Size of worktable(length×width)mm	800*300	1000×500	1000*550	1300×600
   T slot (mm)	5-18x100	5-18x100	5-18x90	5-18×100
   Max loading weight on worktable(KG)	400	600	600	1000
   X-Axis travel(mm)	600	800	800	1000
   Y-Axis travel(mm)	400	500	500	600
   Z-Axis travel(mm)	450	500	500	600
   Distance between spindle nose and table(mm)	105-550	105-605	120-620	100-700
   Distance between spindle center and column(mm)	450	550	540	667
   Spindle taper	BT40	BT40	BT40	BT40
   Max. spindle speed( rpm)	8000/10000/12000
   Spindle motor power(Kw)	5.5KW	7.5/11kw	7.5/11kw	11/15kw
   Rapid feeding speed: X,Y,Z axis m/min	16/16/16 (24/24/24 liner guideway)
   Fast cutting speed m /min	10m/min
   Positional accuracy	±0.005 mm
   Repeat positional accuracy	±0.003 mm
   Auto Tool changer type	16/24arm type auto tool changer
   Air pressure	0.6 Mpa
   Machine weight	4000KG	5500KG	5800KG	7500KG

   • The VMC640 Machining Center can be considered the "All-Rounder" and "Backbone" in the field of vertical machining centers. It may not be the absolute best in any single performance metric, but it strikes an excellent balance between precision, speed, rigidity, price, and stability.

     For most small and medium-sized manufacturing enterprises, the VMC640 is a "workhorse for ROI," capable of covering over 80% of their machining needs. Whether for producing single-piece/small-batch molds or medium-batch production parts, it can reliably get the job done.