Drag Finishing

Walther Trowal® Drag Finishing Machines

M-TMD 4/1  /  M-TMD 4/2  /  M-TMD 6/2

Order Online or by Phone at  888-683-6180

The drag finishing systems developed by Trowal represent a special technology for surface finishing:

• high value, delicate components
• parts with many contours and complex geometry
• extremely hard materials which are difficult to machine

The applications for the Trowal drag finishing technology range from aggressive grinding to surface smoothing and high gloss polishing of decorative parts.

Examples: surgical implants, turbine blades, precision parts e.g. pumps and compressors,  parts made from hard metal, sintered parts, etc.

M-TMD 4/1

Phone us at 888-683-6180 for a quote!

For surface finishing of high value, delicate components, parts with many contours and complex geometry and extremely hard materials.

Functional principle - The components are attached to special fixtures and "dragged" in a planetary movement through a bed of grinding or polishing media.  Compared to vibratory finishing, the process provides up to 40 times higher  grinding performance.  The work pieces are individually attached onto fixtures and, therefore, cannot  impinge on each other.

Technical features

• Compact design requiring very little space
• Main rotary station driven by robust gear motor
• Raising/lowering of the rotary drive system with positive spindle drive
• Lining of the work bowl with highly wear resistant polyurethane
• Quick change of media, e.g. from grinding - to polishing media by simple replacement of movable work bowls
• User-friendly control with 10 different processing programs
• Frequency converter for variable speed adjustment

Work stations - At choice singe rotary station or 2 rotating work stations or Planetary drive with up to 5 work stations.

Tooling stations - Adapter shaft with bayonet locking device or Tooling station "MS" for mechanical coupling and pneumatic unlocking of the work piece fixtures.

M-TMD 4/2 and M-TMD 6/2

Phone us at 888-683-6180 for a quote!

For edge preparation (Honing) of cylindrical carbide tools.

For surface finishing of end mills, drill bits, milling cutters and cylinder roller cutters made of hard metal carbide or CBN.

Application - The Drag Finishing Technique developed by Walther Trowal is a special process for mass finishing of:

• high value and delicate components
• sophisticated geometries and contoured parts
• extremely hard and difficult to machine materials

The field of application for the drag finishing technique covers a wide range from heavy metal removal and edge breaking to fine finishing and surface improvement as well as high luster polishing of visible surfaces.

Functional Properties - The tools are fixtured on special holders and dragged through a still standing abrasive media mass. The individual tool holders may also rotate separately.

• up to 40 times faster metal removal verses vibratory finishing
• components do not touch nor damage during process

Technical Characteristic

• compact, space saving design
• main drive by strong geared motor or servo motor
• lowering / lifting of rotary main gear via spindle drive / ball spindle drive
• fast exchange of abrasive media by replacement of portable work bowl
• user friendly industrial PC with unlimited number of programs
• variable speed adjustment of all drive motors by frequency control
• possible upgrading for automatic loading / unloading systems

The Processing Targets

• produce a defined and reproducible cutting edge radius on cylindrical tools
• improve the quality in the flute and on the clearance angle surface
• improve lifetime of cutting tools with selected edge preparation
• remove uncontrolled debris from surface and polish after coating

The Advantages

• extremely precise edge radiusing in short cycle times
• fully reproducible process performance
• surface improvement of flute and clearance angle area
• up to double lifetime improvement when machining tough materials
• improvement of durability of coated material after edge preparation
• production cost savings with proper edge preparation

Machine Features

• rotary gear driven by main motor or servo motor
• individual tool holders driven by separate motor
• rotation speed and direction individually selectable
• precise submersion adjustment of tools in abrasive media
• rapid movement of lowering / lifting device by ball spindle drive
• fast and easy replacement of portable abrasive media bowl

Tool Clamping Stations

• mechanical clamping and pneumatic disconnect chucks with collets
• special chucks covering a range of tool diameters for automatic load / unload
• up to 4 clamping stations on M-TMD 4/2 and up to 6 clamping stations on M-TMD 6/2