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Machines & equipment for sale

Loser Model 4255 8 Station Centreless Belt Grinding Machine

Direct From Site Clearance

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Please call on +44 (0) 1922 45 8000
Part of a Direct Site Clearance
JCB Hydraulic Bar, Hard Chrome Electroplating and Finishing Cell
Location
Uttoxeter, Staffordshire UK
Stock No
JCB035
Manufacturer
Loser
Model
4255
New or Used
Used (Second Hand)
R.P.M.
Variable
Hp/Kw
10/7.5 per head
Other Info
High capacity throughput machine
Location
Uttoxeter, Staffordshire UK
External Dimensions (WxDxH mm)
11900 x 3100 x 2900 + 16000 outriggers

Description

Loser Model 4255 8 Station Centreless Belt Grinding Machine

Model:  4255

Hp/Kw: 10 / 7.5

Other Info: High capacity throughput machine

External Size (W x D x H mm): 11900 x 3100 x 2900 + 16000 outriggers

Model 4255 is an 8 Station Continuous Centreless Belt Grinding Machine

Abrasive belt grinding offers the efficient surface finishing for tubular and stock bar products. The abrasive bands can achieve cutting capacities of up to 1.2 mm per meter and a surface finish to Ra 0.1 levels.

Application range:

The belt grinding machines from the Loser range are designed to improve the surface finish and dimensional accuracy of small, to large tubular parts; hydraulic, pneumatic and pressure cylinders; spindles, cylinders and rollers; engine components, stamped and sintered parts; deburring and edge finishing; removing scale; Teflon coating, processing before and after coating, etc.

Surface improvement and conditioning for: plating, descaling, decorative grinding, finishing, linishing, degreasing, cleaning, calibrating, deburring, satin finishing, brushing, polishing, mirror finishing, steel finishing, Metal polishing, Tube and bar polishing, removing defects, edge rounding, levelling, decorative finishes, and slag grinding.

Materials:

Hard chrome-finishes, Stainless steel, steel alloys, copper, brass, aluminium, zirconium, plated and sprayed coatings, ceramics, synthetics, etc.

Scope of use

Abrasive belt grinding is a "step-by-step" process and requires multiple passes to achieve the required finishes. The further away the desired finish is away from the raw finish will dictate how many belt heads are ideally needed.  

With a single headed machine, several passes using various abrasive belt grains would be required, but in this twin four headed finisher, bar and tube can be taken from scaled black bar to a ground finish in a single pass. 

Typically, high levels of material removal can be achieved with a 40-60 belt grain, average rates of material removal can be achieved within the range of 80-240 belt grain. These grains, however, leave a very rough surface structure. A visually more aesthetic finish is achieved with a belt grain of 280-400. Work pieces which are processed with the finest abrasive belts 400-600 grain belts are ideally suited for subsequent chrome-plating. Further polishing to mirror finish is also possible with specialist faced belts such as cork. 

For example:

Piston rods with a heat treated initial surface finish, which require an end finish of 0.15 - 0.2 µm Ra prior to chrome-plating are finished with a combination of the following grinding grains:

  1. 80 or 120
  2. 240 or 320,
  3. 400 or 600,
  4. 800 or cork belt.

Benefits

  • Quick and easy to set up and operate with its Siemens PLC controls and Siemens MP270 operator interface.
  • Advanced inbuilt features such as: pressure controlled grinding force, with wear compensation which extends the lifespan of the consumables
  • Manual adjustments for initial set-up
  • Manual offset with auto settings
  • Fully variable speed control of both belts and feed speeds.
  • Pneumatic tensioning of belts
  • Head relief setting to plunge the heads back for ease of belt changing
  • Multi-station systems perform several grinding operations economically and quickly in a single pass without the need to change belts.
  • The multi-station system increases the capacity and reduces the handling cost considerably, since several working cycles can be completed in one pass.
  • The multi system is modular and so can be expanded as production rates demand by adding and integrating up to 4 heads at a single time.
  • This enclosed version is complete with a noise, water and dust proof cabinet to maximise operating comfort and comply with highest safety standards.
  • Machine size changeover can be done manually or fully automatically through the PLC system, minimising the setup time and maximising the production and profit.
  • First class build components - all spindles, screws and bolts are made from stainless steel. This guarantees the maximum life span of the machine. 

 Limitations of the process

Precise machine adjustments allow for surface finish roughness to Ra 0.15-0.25­ but with differing base materials it is possible to achieve a surface roughness of up to Ra 0.04 with an experienced operator. 

Dry grinding increases the material removal, however, this cannot be used in many cases, since the grinding temperatures generated increases too high. This can cause bending in the bar, which prevents the maximum contact pressure being available. Dry grinding also reduces the service life of the grinding belt.

Working with water/emulsions provides greater benefits 

  • Eases the contact of the grinding belt
  • Reduces the temperature of the work piece
  • Reduces the risk that the pipe or bar becomes distorted
  • Extends the service life of the grinding belts,
  • Reduces the noise and prevents the development of dust

Handling:

Handling of the pipes and bars are as important as the grinding process itself. Unnecessary handling considerably inhibits the economy and speed of the system, so this system has been designed and built with a magazine feed, and combined with an automatic loading and unloading system, which qualifies the installation for fully automated operation. 

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Technical details of Centreless grinding machine model 4255

  • Diameter Range Ø10 - 150 mm
  • Belt grinding motors 7,5 kW / 10 HP
  • Belt dimensions 150 mm wide x 2500 mm long,
  • Workpiece transportation system by roller guides with a pinch roll drive system offering secure and precise transportation which eliminates any risk of spinning tubes
  • Patented pressure controlled grinding heads

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 Ancillary Equipment 

 Coolant lift tank with magnetic separator 

From the belt grinding machine, all coolant flows into a drop tank which is equipped with a drum type magnetic separator to filter the metal debris from the coolant flow. The filtered coolant tank is controlled by a level sensor for outgoing flow. 

Paper band filter

From the coolant lift tank, the metallic filtered solution is pumped over the filter bed of the paper band filter. 

The Paper Band Filter delivers a fully automatic 10 - 50 micron filtration system, suitable for the separation of fine particles from the coolant liquid.

Key features

  • Various grades of filter media available
  • Integral coolant pump for distribution directly to the grinding heads
  • Automatic indexing of the paper filter when fully loaded.
  • Easy disposal of the waste directly from the catchment tray.

Advantages

• Low running costs
The power required is minimal, as the filter only operates when the filter medium is contaminated, so only operates a few times a day. Rolls of filter paper may last many months and are competitively priced.

• Easy to install
The unit is free-standing and only needs a feed from the machine, and a mains electrical connection.

• Liquid life
Coolant life is greatly extended with reduced top up. Bacterial growth is inhibited by the efficient removal of contamination.

Labour saving
The roll of filter paper and collection bin only require occasional attention.

 

 

pdf icon Print / Download Loser Model 4255 8 Station Centreless Belt Grinding Machine Datasheet

Additional files

Pre Plate Linish Loser

Photographs taken prior refurbishment. Our refurbishment service is not available on all machines.