Centerless Grinders

TO-60Ⅱ

A high cost performance machine with enhanced options and multi functionality
Also with improved workability and a lower price compared to conventional machines

Outer diameter of workpiece：
φ3～120

Grinding wheel diameter：
φ610×405×φ304.8

Machine dimensions：
2880×1550×2000

SigmaⅡ

A high performance machine that handles from infeed multi-cavity grinding to throughfeed super abrasive grinding

Outer diameter of workpiece：
φ2～50

Grinding wheel diameter：
φ455×205×φ228.6

Machine dimensions：
2450×1500×1950

TO-6040T-FC-TF

A centerless machine with a constant center of threading
Only one machine setup needed even for long workpieces

Outer diameter of workpiece：
φ20～60

Grinding wheel diameter：
φ610×405×φ304.8

Machine dimensions：
3130×1500×2150

Angular centerless grinding machine

TO-5010S-AR

Stable and simultaneous grinding of the workpiece end face is possible on the periphery of the grinding wheel.
A high efficiency machine for grinding small-diameter long workpieces

Outer diameter of workpiece：
φ3～40

Grinding wheel diameter：
φ510×100×φ228.6

Machine dimensions：
2100×1400×2000

TO-6020S-AR

Stable and simultaneous grinding of the workpiece end face is possible on the periphery of the grinding wheel.
A high efficiency machine for grinding small-diameter long pieces

Outer diameter of workpiece：
φ3～80

Grinding wheel diameter：
φ610×205×φ304.8

Machine dimensions：
2820×1850×2000

SigmaⅡ

A high performance machine that handles from infeed multi-cavity grinding to throughfeed super abrasive grinding

Product video

Features

Utilizes a fixed work rest method to keep the loading position constant
Equipped with NC measures as its standard
Depending on the grinding load and accuracy, the grinding wheel shaft can be either cantilevered or double-sided.
By increasing the rigidity of the regulating wheel frame, it can used for a wide range of applications, from multiple grinding to super-abrasive grinding.

Anti-collision control

This Grinding Machine is equipped with a function that recognizes position information as its standard, so even individuals unfamiliar with the machine can use it with peace of mind.

Image of Anti-collision control

Product video

Centerless Grinders
official YouTube channel

Solution

Conveyer

Parts feeder

Gantry loader

Stocker

Grinding performance data


Dimensions	φ23×L80	φ22×L27	φ1×φ2×L33	φ37×L33
Material	SCM440H	—	Tap material	SCM415
Roundness	3.0	1.5	10.0	4.0
Cylindricity（μm）	2.0	2.5	10.0	4.0
Surface roughness（μm）	Rz0.3	Ra0.25	Ry3.2	Ra0.6

※The values are based on requirements.

*Please view the table by scrolling horizontally

A case study

System composition

Click to enlarge image

Performance data of the improvement

graph

Customers having issues with improving roundness

The issue

The customer wants to further improve roundness with infeed grinding

After implementation

By implementing our Centerless Grinder that specializes in roundness as well as by reviewing the grinding process, the roundness was improved by 27%. Because of the improved roundness, the outer diameter dimensions were stabilized and productivity was improved.

Specifications

Machine specification

		SigmaⅡ 4020T	SigmaⅡ 4520S	SigmaⅡ 4515S	Sigma 4015T
Grinding performance	Processing diameter	φ2～50mm	φ3～60mm		φ1～50mm
Grinding performance	Processing length	200mm	200mm	145mm	145mm
Scale feedback		○	○	○	●
Bearing structure		Double-sided	Cantilevered		Double-sided
Grinding wheel	Dimensions	φ405×205×φ228.6	φ455×205×φ228.6(7A type)	φ455×150×φ228.6	φ405×150×φ228.6
	Minimum diameter	φ310	φ360		φ310
	Maximum peripheral speed	3000m/min	3000m/min		3000m/min
	Motor capacity	11kw	7.5kw(11kw)	7.5kw(11kw)	7.5kw(11kw)
Adjustment wheel	Dimensions	φ305×205×φ177.8	φ305×205×φ177.8	φ305×150×φ177.8	φ305×150×φ177.8
	Minimum diameter	φ255mm			φ255mm
	Driving system	Belt reducer			Belt reducer
	Revolution per minute	1～750rpm			1～750rpm
	Motor capacity	3.5kw (AC servo motor)			3.5kw (AC servo motor)
Machine dimensions		2450×1500×1950（※）			2450×1500×1950（※）
Machine weight		4500kg			4500kg