PRESSES AND ROLLERS

PRESSES

DORST supplies presses for a variety of applications:

AXIAL POWDER PRESSES

They enable forming of parts close to their final contour. Advantages: High-performance, cost-effective, no reworking of parts and easy maintenance. They can have an accuracy of up to ±0.001 mm. Depending on the type of drive they can be mechanical with pressing force from 60 to 700 kN, servo-driven from 150 to 1600 kN and positioning accuracy of ±0.001 mm, or hydraulic with pressing force from 1200 to 16000 kN and positioning accuracy of ±0.01 mm.

APPLICATIONS
Forming carbide cutting tips and cermets (lathes), bearings, camshafts. Line automation options are supplied from powder feeding to part palletising.

ISOSTATIC POWDER PRESSES

Isostatic powder presses enable fully automated forming of components close to their final shape, thus making it possible to produce design geometries in large quantities without compromising quality.

For round, square, rectangular and oval ceramic parts up to 480 mm, 1 to 3 cavities with a closing force of 2000 to 7000 kN and isostatic pressure of 300 bar.

For thin-walled technical ceramic pipes with a thickness of 1.2 to 2 mm and a maximum length of 350 mm with a closing force of 400 to 600 kN and an isostatic pressure of 2000 to 2300 bar.

For thick pipes and thin and heavy technical ceramic rods up to 450 mm in length with a closing force of 600 kN and isostatic pressure: 2000 bar.

For shafts, axles, tubes, bushings, nozzles, spheres up to 8 cavities with a closing force of 600 kN and an isostatic pressure of 2000 bar.

APPLICATIONS
Household tableware and ceramics, solid-state ceramic electrolyte substrates for sodium-sulphur or sodium-nickel-chloride batteries (ZEBRA batteries). Line automation options are available including granulate supply, the press and the tool system.

PRESSURE CASTING SYSTEMS

They enable the forming of articles close to their final shape, making it possible to produce uniform geometries with considerable demands on casting and design in medium or large quantities in a cost-efficient way without compromising quality.

For sanitary ware with pressing force from 600 to 3000 kN, 2- to 7-piece moulds, 2 to 6 cycles/h.

For tableware with pressing force from 1200 kN, 2-piece mould, 10 to 40 cycles/h.

APPLICATIONS

Crockery, vases, bottles, hollow or solid casting, lavatories, washbasins, kitchen sinks, shower trays and ceramic slip basins. Robotised line.

SIZING PRESSES

These high rigidity machines enable final forming of parts with great accuracy and cold reshaping after pressing and sintering. Their modular and compact design provides a positioning accuracy of ±0.01 mm. DORST TECHNOLOGIES’ CNC sizing presses deliver extraordinary rigidity and stability, both of which are prerequisites for maximum precision and productivity in daily use. The machine design allows short set-up times in case of product changes, either by using interchangeable die sets or by making the changes directly in the press’s working area. DORST TECHNOLOGIES’ machine portfolio consists of hydraulic CNC presses which feature pressing forces of 1200 kN to, 12000 kN with positioning accuracy of ±0.01 mm.

A selection of integrated automation systems ranging from several system variants to modern robot solutions is available for synchronised, time-accurate feeding plus part recognition, alignment and identification. The high degree of flexibility in part automation design makes it an economically attractive option.

APPLICATIONS

Already pressed / sintered parts. Line automation options are available (fast loading, recognition and alignment, part identification, oiling stations, etc.).

VACUUM EXTRUSION PRESSES

Particular robustness, durability and wear resistance are the prominent features of the DORST vacuum extrusion presses we offer which have been specially developed in terms of both machine design and technical engineering for the extrusion of heavy or very abrasive materials. The presses can be used almost universally and operated anywhere, whether horizontally or vertically, depending on the application.

Key features include a central vacuum chamber for high-density materials and modern frequency-controlled electric drives and the possibility of very precise sectional temperature control of the material on both the feed and press side to achieve high-quality production results with high repeatability. A modern, network-capable process control system is used for visualisation, operation and evaluation of all process data.

DEBURRING SYSTEMS

DORST supplies deburring systems in its FLEXCELL16 and 16A models. Precision powder press with integrated automation for the production of pressed parts made of hard metal, technical ceramics, metal powder or other powder materials. All the press’s axis drives are in the lower, encapsulated machine housing, perfectly protected from dust and contamination. The unique direct power transmission from the rigid lower machine section to the upper press crosshead meets the highest requirements for accuracy and concentricity over the entire stroke. The press is fitted with high-resolution force measurement which delivers full control at every stage of the cycle, especially when demoulding micro or delicate pressed parts.

ROLLERS

Lippert has developed NC-roller technology for the ceramics industry with maintenance-free three-phase servomotors which perform all vertical and horizontal axis movements by means of high-precision screw ball rollers. The stability of the guide ensures highest product quality. This technology is implemented in a wide range of rollers for every task in these series:

Single roller
Single and double roller with turntable
Carousel production line
Bowl, cup and plate production line

ADVANTAGES
The Lippert NC-rollers technical concept allows very variable and fine settings options, the highest precision in roller head movements and exactly reproducible production processes. In terms of production, this means:

Best plastic shaping procedure for each specific article
Producing extraordinary and complicated articles
Reduced thickness for very thin and fine porcelain and bone china
Reliable high product quality over time
Extremely fast retooling times as the product line changes instantly
Simultaneous production of different products with double-head rollers