Horizontal and vertical disk and double disk and rotary table type surface grinding machines.
Koyo Machine Industries Company Overview

Koyo Machine Industries Co., Ltd. is represented in Europe by
Crystec Technology Trading GmbH

Crystec Company Overview
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Disk and Double Disk Surface Grinding Machines

For manufacturing of high precision metal parts and in order to achieve very good flatness, parallelism and surface finish, disk surface grinding machines are used. Important properties for those machines are precision, efficiency, rigidity, stability, stiffness and automation.
Single disk grinding machines use a rotary table to mount the parts while usually a vertical spindle grinding wheel is grinding the parts. On the same machine and using the same rotary table, also two spindles can be mounted, e.g. for coarse grinding and for fine grinding.
Double disk surface grinding machines use either horizontal or vertical spindles and the metal parts are ground same time from both sides. Many different types of part feeding and automation are available. Special case are double disk grinding machines for silicon wafers.

surface grinding machines with rotary table double disc horizontal spindle surface grinding machine double disc vertical spindle grinder
Rotary table type surface grinding machine: R type Horizontal double disk grinding machine: HD type Vertical double disk grinding machine: KVD type

Grinding Wheels and Dressing

HD grinding wheel

Disk surface grinding machines can be equipped with various types of grinding wheels. Grinding wheels can be made of Aluminiumoxide Al2O3, Silicon Carbide SiC, cubic Boron Nitride cBN od Diamond. cBN and diamond grinding wheels are very hard and can be used for high precision grinding of hard materials. Lifetime of these grinding wheels is very high. The bonding of the abrasive is done either vitrified, resin or ceramic. Grinding wheels are characterized by dimension, grit size and bond grade. Reshaping of the grinding wheels is done by dressing and truing. From Koyo, a special dressing and truing system is available as an option: electrical discharge truing E-dt.


Main Applications

Mass Production
e.g. bearings, bodies, brake disks, cages, cylinder planes, impellers, pistons, plates, rings, rods, rotors, sleeves, etc.
Special Applications
z.B. ceramic discs, piezo actuators, etc.

applications

Crystec Technology Trading GmbH, www.crystec.com, +49 8671 882173
line

HD-type Koyo horizontal double disk grinder.

Koyo's HD (Horizontal Disc) Series of surface grinders have a unique, highly-rigid and very stiff structure to ensure super-precision for heavy-duty grinding applications.

HD-3

HD-3
Compact type surface grinding machine, suitable for cBN and diamond wheel use.
HD-5

HD-5
Superior durability and heavy-duty grinding machine capability for a wide range of applications.
HD-7 & HD-10

HD-7 & HD-10
Rigid and stiff design, suitable for large workpiece grinding.

Special Features Available on HD Series Grinders:


Feed systems available for HD-type machines:

Thru-feed, through-feed Rotary Carrier Gun-feed Swing-arm
thru-feed automation, through-feed automation rotary carrier automation gun feed automation swing arm automation
Feeding for highly-efficient mass production of simple-shaped workpieces (bearings, piston rings, etc.)

Feeding for irregular-shaped workpieces and small components (connecting rods, rollers, cross-pins, etc.)

Feeding for oddly-shapedworkpieces and partial-surface grinding (brake discs, etc.)

Feeding for intricate workpieces and end face grinding (cross-pins, etc.)


Crystec Technology Trading GmbH, www.crystec.com, +49 8671 882173
line

KVD type Koyo vertical double disk grinder.

In the KVD (Koyo Vertical Disc) Series of surface grinders, large angular-thrust and ultra-precise roller bearings are used in the wheelspindle to ensure high-precision grinding.  The slim column design is ideal for space-saving integration with automatic machine loading/unloading and gauging systems.  These machines have gained world-wide acceptance in automotive, bearing, home appliance, and communications industries.

KVD-300II

KVD-300II
In Model KVD-300II is one of our most popular grinders.  Its rigidity makes it great for grinding difficult materials.
KVD-301 & KVD-302

KVD-301 & KVD-302
The KVD-301 is a single-surface grinder with high rigidity to ensure super-precision grinding and stability.
KVD-450

KVD-450
Model KVD-450 is highly rigid to ensure super-precision grinding and stability and is  designed to accommodate a wide variety of medium-sized workpieces.
KVD-580

KVD-580
Model KVD-580 is highly rigid to ensure super-precision grinding and stability and is designed to accommodate large workpieces.


Special Features Available on KVD Series Grinders:


Feed systems available for KVD-type machines:
Thru-feed, through-feed Rotary Carrier Oscillation In-feed
thru-feed, through-feed automation rotary carrier in-feed automation

Feeding for bearing rings, etc.

Workpieces are placed in pockets of the rotary carrier plate and pass between the upper and lower grinding wheels.  For ceramics, piston rings, roller bearings, gears, etc.

The combination of rotary carrier and oscillation functions used in this method achieve high efficiency.  For vanes, etc.

 

Swing-arm Double Swing-arm Collet Chuck
swing arm automation double swing arm automation collet chuck

Workpieces are placed in a fixture jig plate which swings to the center of the spindle for grinding. For rings, rotors, etc.

Used to meet special requirements of various workpieces. 
For gears, rollers, etc.

Clamped by collet chucks, workpieces are forced to rotate while the jig table swings 180° for grinding.   For   covers, etc.


Crystec Technology Trading GmbH, www.crystec.com, +49 8671 882173
line

R-type Koyo rotary table type surface grinding machine.

The R (Rotary Table) Series of surface grinders have been developed in response to customer demand. They come equipped with various capabilities to meet many grinding applications. The R-type machine is available in various sizes and with one or two spindles. Several smaller work pieces might be ground simultanously with one grinding wheel.

R-031

R-031

The R-031 surface grinding machine implements new technology by self-rotation of the part during grinding.

R-421 & R-422

R-421 & R-422
With the R-421 surface grinding machine, mirror finishes are achievable on small parts by providing full automation and vacuum chucking of the part while eliminating excessive lapping.
R-431

R-431
The R-431 surface grinder makes it possible to grind the top and bottom faces of a part using one spindle.
R-631

R-631
The R-631 surface grinder makes it possible to simultaneously load and unload parts during the grinding process.
R-632

R-632
The R-632 surface grinding machine has two grinding wheel heads for rough and finish grinding to achieve high accuracies and mirror finishes.  This machine was manufactured specifically for the IT, Automotive, and Household Electronics industries.
RV2

RV2
Full automation and high productivity can be achieved by the RV2. Synchronized mechanism between the table and the loader.


Special Features Available on R Series Grinders:

Machine Configurations for R Series Grinders:

single spindle
dual spindles
several work pieces
One spindle machine
Two spindles machine
Grinding several work pieces simultaniously
Crystec Technology Trading GmbH will be pleased to further discuss details with you.
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