KVR-GV / KVR-G / VPU-EG / KVR VACUUM CHUCKS

Product catalog summary

Overview of Vacuum Chucks (Model KVR)

Vacuum chucks utilize atmospheric pressure to hold workpieces by creating a vacuum inside the chuck. They are suitable for machining nonmetallic and nonmagnetic materials such as plastics, aluminum, brass, stainless steel, ceramics, and glass. These chucks are commonly used in grinding and cutting applications.

Key Features

Adjustable suction holes on the chuck face allow customization of the effective holding area to match workpiece shapes via thread valves and valves.
Suction holes include cross grooves to expand the vacuum acting area, reducing the number of thread valves needed and improving work efficiency.
The chuck work face is made of iron, enabling self-grinding to maintain parallelism and allowing the use of magnetic devices as workpiece stoppers.
Special suction hole layout adapters can be installed to suit specific workpieces and procedures.
These chucks can be mounted on magnetic chucks for enhanced versatility.
No internal heat sources or moving parts ensure high precision machining.

Model Variants

KVR-D (Thread Valve Type): Allows setting an effective holding area tailored to workpiece shapes with combined adjustment of thread valves and valves. Cross-shaped suction grooves reduce the number of thread valves, enhancing efficiency.
KVR-H (Small Hole Type): Features φ4 mm holes spaced at 8 mm pitches on the holding face. Available upon request.

Operating Principles and Precautions

The vacuum chuck operates by exhausting air inside the chuck using a vacuum pump, creating a pressure differential that holds the workpiece by atmospheric pressure. The maximum achievable vacuum pressure difference is approximately 80 kPa (600 mmHg), corresponding to a holding force of about 0.8 kgf/cm².

For example, a workpiece with a 100 cm² holding area can be held with approximately 800 N (80 kgf) of force. However, rough or distorted workpiece surfaces can cause leaks, significantly reducing holding power. Leak prevention measures are necessary for such cases.

Heat generated during machining can deform workpieces, especially thin stainless steel plates, which are difficult to hold due to thermal deformation. Users should consider machining methods carefully and consult the manufacturer if needed.

Technical Specifications

Model	Nominal Dimensions (mm/in)	Top Plate (B₁ × L₁)	Hole Pitch (P)	Bottom Plate Height (h)	Mass (kg/lb)	Applicable Vacuum System
KVR-2D1018	100×175 (3.93×6.89)	100×175	20 mm (staggered layout)	70 mm (2.75 in)	9 kg (19 lb)	VPU-E10, VPU-E20, VPU-D20
KVR-2D1325	125×250 (4.92×9.84)	125×250	20 mm	121 mm (4.76 in)	15 kg (33 lb)	VPU-E10, VPU-E20, VPU-D20
KVR-2D1515	150×150 (5.90×5.90)	150×150	20 mm	146 mm (5.74 in)	11 kg (24 lb)	VPU-E10, VPU-E20, VPU-D20
KVR-2D1530	150×300 (5.90×11.8)	300×245	20 mm	320 mm (12.6 in)	22 kg (48 lb)	VPU-E20, VPU-D20
KVR-2D1545	150×450 (5.90×17.7)	450×405	20 mm	470 mm (18.5 in)	33 kg (72 lb)	VPU-E20, VPU-D20
KVR-2D2035	200×350 (7.87×13.7)	200×350	20 mm	196 mm (7.71 in)	34 kg (74 lb)	VPU-E20, VPU-D20
KVR-2D2050	200×500 (7.87×19.6)	500×465	20 mm	520 mm (20.4 in)	49 kg (108 lb)	VPU-E20, VPU-D20
KVR-2D3060	300×600 (11.8×23.6)	300×600	20 mm	296 mm (11.6 in)	88 kg (194 lb)	VPU-E20, VPU-D20

Note: Clamp parts are included in the models.

Summary

The KVR vacuum chucks provide a versatile and precise solution for holding a wide range of materials during machining processes. Their adjustable suction system, iron work face, and compatibility with magnetic devices enhance their functionality. Users must consider surface conditions and thermal effects on workpieces to ensure optimal holding performance.