Centerless grinding and polishing

Applications:

Surface improvement and conditioning for : plating, descaling, decorative grinding, finishing, linishing, degreasing, cleaning, calibrating, deburring, satin finishing, brushing, polishing, mirror finishing, superfinishing, microfinishing, removing defects, edge rounding, levelling, decor finish, precision cutting, slaggrinding

Workpiece and parts:

tubes, bars, pipe, profiles for furniture industry, decorative stainless, shop interior, engine components, axles, precision engine parts, paper tubes, fiber and kevlar tubes, golf shafts, stainless tube, heat element, door handle, peeled bar, hydraulic cylinder rod, telescopic cylinders, chrome bar, steel bar, boiler tube, rods

Models:

RPS 374 for part diameter up to 150 mm

RPS 376 for part diameter up to 250 mm

RPS 377 for part diameter up to 500 mm

Flat grinding machine

Applications:

Surface improvement and conditioning for : plating, descaling, decorative grinding, finishing, linishing, degreasing, cleaning, calibrating, deburring, satin finishing, brushing, polishing, mirror finishing, superfinishing, microfinishing, removing defects, edge rounding, levelling, decor finish, precision cutting, slaggrinding

Workpiece and parts:

Strip, tubes, squares and profiles for furniture industry, decorative stainless, shop interior, engine components, sintered metal parts, punched, laser cut, sheet metal, stamping, double disc ground parts, textile parts, ceramic parts,

Models:

FS 384 for parts 150 x 100 mm

FS 386 for parts 150 x 150 mm

FS 387 Heavy Duty for parts 300 x 300 mm

FS 384 Low Cost for parts 150 x 100 mm

Flatgrinding

Quick and easy operation with computer controls and pressure controlled grinding. Wear compensation on buffing and polishing wheels. Pressure control maximizes the life of the consumable items.

Applications:

Surface improvement and conditioning for : plating, descaling, decorative grinding, finishing, linishing, degreasing, cleaning, calibrating, deburring, satin finishing, brushing, polishing, mirror finishing, superfinishing, microfinishing, removing defects, edge rounding, levelling, decor finish, precision cutting, slaggrinding

Workpiece and parts:

Strip, tubes, squares and profiles for furniture industry, decorative stainless, shop interior, engine components, sintered metal parts, punched, laser cut, sheet metal, stamping, double disc ground parts, textile parts, ceramic parts,

Models:

FS 384 for parts 150 x 100 mm

FS 386 for parts 150 x 150 mm

FS 387 Heavy Duty for parts 300 x 300 mm

FS 384 Low Cost for parts 150 x 100 mm

Wheel deburring

De-Burring with Loeser Brushing Machine

* Can be fully automated with tremendous labor savings

* Very reliable and repeatable process

* Produces excellent deburring results in all areas of wheel

* Process not only removes burr but also generates a rounded edge

* Removes primary burrs without producing secondary burrs = RESULT IS A RADIUS

* Process is very safe for workers

* Salt spray test is easy to perform because of evenly broken round “edges“

* Passes “Kesternich-Test“ when machine is set correctly = 480 hours

LOESER Method - effect on Surfaces

* Complete surface is brushed evenly

* Effect of nicks is clearly reduced due to removal of surface oxide layer

* No additional operation is needed; procedure is performed together with de-burring

* Wheels are clean after brushing operation

* High life expectancy of brushing machines

SUMMARY

The Loeser brushing process ultimately results in greater life expectancy of the wheel. The close up view shows before and after deburring of a window edge using the Loeser brushing process. The clearly shown burr-free radiused edge provides the best possible condition for the coating application and protection. Brushing also improves the face surfaces and allows the protective coating to cover all areas evenly. This strongly improves the life expectancy of the wheel. Test like the “Kesternich-Test“or salt spray test verifie this improvement. This combined with realizing a sizable reduction in manpower makes Loeser machines the best possible choice for return on investment

Hardening of the surface is necessary for work pieces exposed to severe work conditions such as hydraulic cylinder rods on earth moving equipment. This process makes the surface much more resistant to scraping, gouging, and denting caused by hard objects striking the outside diameter.

his process is mainly used on hydraulic cylinders; other applications include ball screws to increase the wear resistance in the ball track and other round parts.

The technology is based on the induction hardening process. Induction hardening uses eddy currents to produce heat on the surface of the work piece. Eddy currents are evoked by one or more induction coils with high frequency alternating current.

The number of induction coils used, is determined by the required through feed speed, depth of hardness and the diameter of the bars or pipes.

A continuously running transport system feeds the steel bars through the induction coils at a consistent speed.

Specifically engineered transport system, controlled by the PLC, is designed for maximum efficiency and production. The extremely accurate and repeatable spiral movement insures consistent hardness and hardening depth throughout the complete bar.

The outer surface heats up to the required hardening temperature. Deeper layers will not reach this temperature during the short heating period and therefore will not be hardened.

Immediately after heating, the bar or tube is quenched with an emulsion or with water. The quenching medium is applied by an automatically operating quencher.

A quantity of bars is initially loaded onto a load table equipped with an automatic operating magazine loader. The magazine loader picks up the bar and places it onto the in feed transport conveyor where it then travels through the hardener and exits the machine on the exit transport conveyor. The bar is then automatically lifted off the exit transport conveyor and placed onto the unload table. The process automatically repeats leaving the minimum amount of distance between bars for maximum efficiency. After quenching, the residual cooling agent is removed from the bars using an air blow off device. The guide roll system moves the bars to an ejector. The bars are retained in an outfeed magazine. The effective hardening depths depend on the required operating conditions. It is possible to reach a depth of approx. 2,5mm. Hardening results also depend on the material up to 700 HV/60HRC. Depending on application these values may vary. Additional induction coils allow further hardening depth. Depending on the hardening temperature it is possible to vary the surface hardness. Throughput speed varies depending ont the diameter of the part. Smaller diameters feed faster than larger diameters proportionetly.

Developing the chrome plating technology and designing a process reliable chrome plating machine was an important step for Loeser on the road to becoming a supplier of complete systems in the market of surface optimization of bars and pipes.

Through type chrome plating is used to seal with a galvanic chrome layer on the surface of parts that are produced for mechanically demanding applications. Many mechanical parts, like cylinders, mechanical guides or press punches can be produced simply and economically. Chromium plating is an electrochemical process, used to seal the surface of a metal with a coat of chrome. For mechanical use or respectively for protection, the thickness of the chromium coating ranges between a few hundredths and a few tenths of a millimeter.

In the past the work pieces were dipped into a tank filled with chromium acid. The tank was equipped with lead anodes, attached to the positive pole of a rectifier. The work piece had to be attached to the negative pole of the rectifier. However this procedure poses several major problems:

While the bars leave the chromium bath, some of the chromium acid liquid can drop to the floor;

Large tanks are filled with many thousand liters of chromium acid;

The guidelines for appropriate handling of chromium acid are kept very strictly all over the world;

Strict official approval proceedings are required.

The reduction of the amount of chrome bath solution in regard to reducing pollution is an absolute necessity;

The thickness of the chromium layer is hard to control.

Te position of the anodes is radially symmetrical with respect to the bars. herefore the chromium layer is not consistent.

Due to the distribution of the lines of force the chromium layer increases in areas that experience a stronger flow of the electric current.

The procedure generates a product of lesser quality that consumes a large amount of chromium and entails environmental damage.

Loeser developed a through type chrome plating machine, which solves these problems elegantly.

Roll grinding and center type grinding

Rollgrinding machines turn the workpiece on driven rolls and center type machines hold the part between center,cone or chuck and tailstock. Between centers tight tolerances can be achieved and heavy stock removal can be applied also on light parts. The roll grinding machines with the roller bed are easy and quick to load and unload and can handle parts without center. On both systems the grinding head is travelling along the workpiece.The heads can be configured with belt grinding, polishing, stone grinding, superfinish and microfinish with tape as well as with lapping stones

Applications:

Surface conditioning prior to surface coating or plating. Finishing of coated surfaces like HVOF spray coatings, chrome plated rolls, rubber coatings and ceramic coatings. Stripping of hard materials like ceramic or chrome plated printing rolls for quick rework. Fine superfinishing of rotogravoure rolls prior to copper plating or engraving. Grinding, polishing, superfinishing and microfinishing of pressure rolls, sleeves, anilox rolls or printing rollers used in the graphic industry.

Hydraulic cylinder surface preperation for extended life times of the product lip seals and o-rings.

Tolerance grinding and grinding to specific shapes in the HSD machines. Decorative grinding and preperation of special surface textures for increased life time of doctor blades in printing machines. Descaling and removing of turning marks prior to ultrasonic testing for billerts and steel rolls and bars for steel works. Therefore machines with roller bed are most suitable.

Microfinish down to Ra < 0.004 µm on mirror polished rolls for the film and foil industry. Polishing operations for the rolls used in paper mills.

Workpiece and parts:

paper rolls, rotogravoure rolls, cylinders, printing rolls, sleeve rolls, billets, drums, rubber rolls, steel work rolls, calander rolls, anilox rolls, ceramic rolls, HVOF rolls, granit rolls, telescopic cylinders, axles, hydraulic bars, tubes, pipes...

Models:

New Generation 2007 : High Speed Dechrome and Finish for diameter up to 500 mm and weight 2,5 ton

HSD tolerance grinding with belt and stripping of chrome

HSDSF beltgrinding and superfinish/microfinish for all operations at once

HSD Stone beltgrinding and stonegrinding for creating curved rolls

HSF Super Finish and Microfinish for mirror polished rolls

ZSP 377 Belt grinding machine between centers for large rolls diameter 1000 mm and up to 14 meter long

ZSPR 377 Belt grinding machine with driven roller guide for heavy parts with quick and easy load/unload