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Glass drilling

Saturday, January 19th, 2019

Glass drilling

 

 

 

Introduction

 

The standard tool used to drill on glass is a core drill ( Belgium standard) with ½ inch fitting. Different lenght are available, but the more common is 75 mm for a new tool. The diamond activ part has a lenght between 10 and 12 mm.

 

The first problem met drilling on glass was the chips created by the core drill on the glass bottom face. The pressure from the core drill causes glass breaking out at the end of the drilling. To solve this problem, glass was firstly drilled on a face on few millimeters and after reversed and drilled exactly at the same place.

 

The first drilling machines was machines coming from mechanical industry, with a “ water box ” addition to drive the water for the cooling inside the core drill.

 

To prevent damages or accidents during drilling, the machines suppliers has proposed drilling machines with 2 opposed spindles on line allowing drilling from the both sides without moving the glass.

 

 

 

Double spindle drilling machine from Janbac

 

The working cycle is

-Water opening for the lower spindle

-Fast climbing for the lower spindle up to somr millimeter from the glass

-Proper climbing speed to drill and drilling on few millimeters

-Lower spindle way down, water stop and core drill protection.

-Water inside the top spindle

-Fast descent till the glass surface

-Proper drilling speed adjustement

-Drilling till the bottom glass surface

-Glass carrot eviction

-Spindle rising and water stop

 

The working cycle can be manual, semi-automatic or automatic with remote control in case of large glass.

 

 

The lower core drill drills 1/3 of the glass thickness for medium glass thickness ( 8, 10 mm). But ½ for 2 mm and ¼ or less for 12 mm and over.

 

The spindles have changed over the years. Firstly mecanic, after hydrolic, then electric and now electric with servomotors for a best accurency

 

Main machine stypes present on the market

To-day the suppliers propose 3 different way to drill on glass

-Horizontal machines

-Vertical machines

-Drilling with a CNC machine

 

1/The horizontal drilling machines

-Mono-spindle : you have to reverse the glass and to drill

-The opposite double-spindles machines : the more common on the market

-The multi-spindles machines with 2 or more ( 3,4,6) opposite double-spindles  : intented to market where several different holes have to be performed  on the same glass. These machines can be positionned in line with a double edger, even if the drilling lower speed cycle reduce the double edger speed.

 

 

Multi-spindles machines from Janbac

 

2/The vertical drilling machines

These machines were introduced on the market by the Autrian Company Schraml, 15 years, under the Topdrill trademark.

 

 

 

Vertical drilling machine fromTopdrill

 

 

Contrarily the horizontal double spindle drilling machines where the drilling heads are fix, here the double spindles move on Y axe.

The main advantages for vertical drilling

-Place saving : Interesting for smallest machines, but not real for the ùore important ‘ones because teh inlet and outlet conveyors.

Les principaux avantages de ce type de machines sont

-The drilling is automatic : the glass is installed on teh inlet conveyoe and the hole is automatically carried out from teh data intered inside the control panel.

-Drilling on line and less glass manula handling : the glass can come directly from an other vertical machine ( edging, sandblasting machine..) and sent automaticaly to a washing machine. Less handling means less scratches and accidents

-Water recovering : the water drops vertically after tools cooling and is easy to recover.

 

But this machines type meet some inconveniences :

-It is not possible to drill more than 2 different diameters ( but some machines propose now a tools store with automatic changing).

-It is difficult to have the two spindles perfectly on line

-The cooling is less efficient, the water leaving fastly the core drills.

-The glass is installed on one edge, causing some vibrations and more scratches during drilling.

 

The machines has one or two double spindles, the second one being often replaced by a milling spindle. Possibility to have an automatic tools store

 

The vertical drilling machines meet a real succes from customers, mainly for the smallest machines. They represent an important need on the market.

 

3/Drilling on CNC machines

Here the market is not the same. The idea is not to use a CNC machine as a drilling machine, but to complete process a glass on the same machine including holes.

To solve the scratches problem at the drilling end two possibilities are offered on the market.

-A software and a special tool allowing to drill and after to remove the scartches with only one tool.

-An option allowing to start to drill under the glass and to finish the drilling by the top.

 

 

Intermac option to drill with CNC machine

 

Drilling parameters

1/Advance speed

The advance speed for glass drilling is about one millimiter per second for diameters between 10 and 30 mm. For lower and larger diameters the speed has to be reduced

The drilling speed is also connected with:

-The core drill supplier

-The dressing

-The cooling

-The drilling machine

-The glass

 

2/The spindle rotation speed

Strictly connected with core drill diameter and with the supplier ( Each supplier has his own rotation speed table).

Happily the modern drilling machines are supplied with electronic variator allowing to adjust immediatly the roation speed after core drills changes.

The older machines are equiped with a pulleys/Belts system not easy to use.

 

 

Main available options

1/Hole positionning

a/Laser : a laser installed in the upper spindle center indicate with a luminous point on the glass the place where to drill. The glass has to be marked. indique par un point sur le vitrage, l’endroit où se fera le perçage. Cela implique de marquer sur le verre le centre de l’endroit à percer. The water on the glass can disturb a proper positionning. The laser has to be adjusted on a regular base.

 

b/Equerres manuelles :des butées avec indicateur millimétrique sont positionnée d’un côté et sur l’arrière de la table où s’effectue le perçage. L’opérateur pousse le verre contre les butées pour positionner correctement le verre.

 

c/Butées automatiques : les coordonnées du trou à percer sont entrées sur le pupitre de la perceuse. Les butées se déplacent automatiquement. Le verre est positionné manuellement ou automatiquement contre les butées.

 

 

2/Milling

Il s’agit là de l’évolution récente des perceuses vers des centres perçage/fraisage capables de réaliser à la fois des trous et des encoches, en particulier dans le cas des perceuses verticales. La broche de fraisage est souvent différente car elle nécessite davantage de puissance et  de couple et des vitesses de rotation plus élevées que celles requises dans le cas du perçage.

 

 

Drilling, milling Janbac machine

 

3/Automatic dressing

Option permettant à intervalle régulier d’amener les forêts devant un baton d’affutage.

 

4/Compensation d’usure des outils et mesure de la longueur des forêts

Le seul système qui demeure est un calibrage manuel sur une pièce de métal ou de verre d’épaisseur connue.

Lors d’un changement de forêt ou après un certain nombre de trous on descend manuellement le forêt sur la surface de référence. La perceuse enregistre la côte par différence de pression et adapate son cycle de perçage en fonction de la nouvelle longueur de forêt détectée.

 

 

5/ Magasin d’outils et changement automatique

 

 

Conclusion

Grinding wheels for flat glass processing

Saturday, January 30th, 2016

Types of grinding wheels and tools for the processing of flat glass

 

Article written in collaboration with Dott. Renato Genocchio

 

 

There are many aspects to consider when considering a shaping operation of flat glass with diamond tools and polishing tools.

First there are the words used whose meaning can vary depending on who is talking about it.

 

The experiences of those working in this sector are different (and even contradictory in some cases) and in addition, given that there is no specific literature about it – there are only general articles in industry publications examining only the most general aspects of shaping operations – it is not easy to objectively establish a solid foundation for a common language.

 

And it is often the customers starting from their experience, sometimes passed on from generation to contradict everything the tools producers live every day.

 

So sometimes the simple naming of types of tools for glass can be a problem. It is normal, for example, called “polished” the bakelite bonded diamond wheels that have many functions other than to polish glass. It is only the wheels with synthetic binder (rubber, polyurethanes, polyesters) with abrasives such as silicon carbide, corundum and cerium oxide in which this task is allotted.

Or better, if we want to be really precise, we should speak of true polishing as in the case of cerium oxide grinding wheels, since they are an alternative to felt working with liquid cerium oxide. They only have a polishing action while the other grinding wheels with abrasive silicon carbide or aluminum oxide (corundum) have at least one double abrasive and polishing which, in the case of large particle size of the abrasive (from 40 to 80 Mesh) is undoubtedly more abrasive as polishing.

 

So we propose to classify the families of wheels for glass in 4 categories:

 

1) metal bonded Diamond wheels

2) Diamond wheels binder resin (thermosetting resins normally phenolic or melamine)

3) Circles abrasive silicon carbide, aluminum oxide or similar with synthetic binder.

4) abrasive wheels Cerium Oxide with synthetic binder

5) or compact spiral Felt, wool or synthetic, working with liquid cerium oxide.

 

The first two types of grinding work on mandrels with variable speed of rotation between 2800 and 3500 revolutions per minute while the other three working with moving pins equipped with a pressure device, and with a rotational speed between 1400 and 2800 revolutions per minute, although there are polishing wheels can work even in variable-speed mandrels.

 

Usually shaping operations are carried out without using all five types above,

 

Considering the usual working of, I would propose the following classification:

a) Bevel

b) Forming gasket on vertical or bilateral straight (cup wheels)

 

c) Shaping round seal with straight vertical or bilateral (peripheral grinding wheels)

 

d) Forming glass seal with numerical control machines

 

We will examine each case to determine generally the types of tools and the most common problems.

 

 

 

 

 

 

 

 

 

 

 

 

 

 Types of grinding wheels and tools for the processing of flat glass

 

Article written in collaboration with Dott. Renato Genocchio

 

 

There are many aspects to consider when considering a shaping operation of flat glass with diamond tools and polishing tools.

First there are the words used whose meaning can vary depending on who is talking about it.

 

The experiences of those working in this sector are different (and even contradictory in some cases) and in addition, given that there is no specific literature about it – there are only general articles in industry publications examining only the most general aspects of shaping operations – it is not easy to objectively establish a solid foundation for a common language.

 

And it is often the customers starting from their experience, sometimes passed on from generation to contradict everything the tools producers live every day.

 

So sometimes the simple naming of types of tools for glass can be a problem. It is normal, for example, called “polished” the bakelite bonded diamond wheels that have many functions other than to polish glass. It is only the wheels with synthetic binder (rubber, polyurethanes, polyesters) with abrasives such as silicon carbide, corundum and cerium oxide in which this task is allotted.

Or better, if we want to be really precise, we should speak of true polishing as in the case of cerium oxide grinding wheels, since they are an alternative to felt working with liquid cerium oxide. They only have a polishing action while the other grinding wheels with abrasive silicon carbide or aluminum oxide (corundum) have at least one double abrasive and polishing which, in the case of large particle size of the abrasive (from 40 to 80 Mesh) is undoubtedly more abrasive as polishing.

 

So we propose to classify the families of wheels for glass in 4 categories:

 

1) metal bonded Diamond wheels

2) Diamond wheels binder resin (thermosetting resins normally phenolic or melamine)

3) Circles abrasive silicon carbide, aluminum oxide or similar with synthetic binder.

4) abrasive wheels Cerium Oxide with synthetic binder

5) or compact spiral Felt, wool or synthetic, working with liquid cerium oxide.

 

The first two types of grinding work on mandrels with variable speed of rotation between 2800 and 3500 revolutions per minute while the other three working with moving pins equipped with a pressure device, and with a rotational speed between 1400 and 2800 revolutions per minute, although there are polishing wheels can work even in variable-speed mandrels.

 

Usually shaping operations are carried out without using all five types above,

 

Considering the usual working of, I would propose the following classification:

a) Bevel

b) Forming gasket on vertical or bilateral straight (cup wheels)

 

c) Shaping round seal with straight vertical or bilateral (peripheral grinding wheels)

 

d) Forming glass seal with numerical control machines

 

We will examine each case to determine generally the types of tools and the most common problems.

 

 

 

 

 

 

New web site for wheels for glass processing machines

Tuesday, May 6th, 2014

Vedip, a web site for wheels for flat glass processing is now on line.

 

The wheels are manufactured in Italy an delivered directly  every where in Europe.  Are already on line the wheels for around 100 glass processing machines coming from the main 20 machines suppliers (Bavelloni, Glaston, Bovone, Intermac, Schiatti, Lattuada, Zafferani, Baudin, Denver, Forel, CMS, Besana, Bavellino..).

 

For more information contact directly Vedip.

http://www.vedip.com

info@vedip.com

Phone 00 33 782 39 43 34

Web site to buy wheels for glass processing

Tuesday, April 15th, 2014

A new web site, Vedip, is now on line to propose to buy diamond wheels for flat glass processing machines  directly on Internet.

 

The wheels are manufactured in Italy and delivered everywhere in Europ. The are around 750 different wheels available on line (diamond cup wheels; peripheral diamond wheels, polishing wheels with rubber bond, stone wheels for arris polishing or for CNC machines…) for the more important machines and machines manufacturers present on the flat glass processing market.

 

Vedip

 

http://www.vedip.com

New wheels production line for Bovone diamond tools for Bavelloni machines

Sunday, June 19th, 2011

Bovone Diamond tools (BDT) has started the production on its new production line dedicated to diamond, stone and polishing wheels for straight line edging and bevelling machines from the Italian machine supplier Bavelloni.

This line produce diamond wheels for float and laminated glass, stone wheels, polishing wheels and bright polishing wheels (white wheels).

Original diamond and polishing wheels for Bavelloni glass processing machines

Friday, April 8th, 2011

If you are looking for orginal diamond and polishing wheels for Bavelloni straight-line edging machines ( MD/4, MD/5, PR/88, CR1111, PRV99, GEMY 6, GEMY 8, GEMY 11, GEMY V10, GEMY V11) and for Bavelloni straight-line bevelling machines (B73CN, B73CNS, B75CN, B75CNS, MAX50, MAX60, MAX80), manufactured in Europe, please contact info@comascotec.com to receive an offer.

Siapi, from selling to manufacturing

Thursday, March 31st, 2011

The company started in 1929 selling tools for automotive industry. In 1971, the Italian company from Milan entered on manufacturing markets for metal, glass and later stone and started to produce polishing wheels.

The company is ISO 9001 from 1997 and has alos the OSA certification:

 

Tools range:

For glass:

-Resin peripheral polishing wheels

-Rubber and polyurethane cup wheels

-Rubber and resin seaming wheels

-Resin ingraving wheels

 

For stone
-Polishing wheels for marble, granite and ceramic

-Wheels for porcelain

 

Italomole, the reference for peripheral polishing

Monday, March 28th, 2011

Located in Milan south, the Italian company, polishing wheels manufacturer for flat glass industry has fastly growed surfing on the CNC machines wave.

Leader for peripheral polishing with its famous wheels BD and BStar, the company has always developed its wheels range entering on straight-line edging machines market, on incision market, on bright polishing market and recently on diamond wheels and tools market with its branche Vitralux.

Now the company offers a comprehensive tools rang:

-Wheels for incision

-Peripheral wheels

-Wheels for threads

-Cup wheels

-Outline wheels

-Felts

-Polishing wheels

-Diamond wheels with Vitralux
 

BSA (Bando) diamond tools suppliers for very hight speed processing

Thursday, March 24th, 2011

The Machine manufacturer from Japan has a branche BSA manufacturing diamond tools for very hight speed processing.

 High quality diamond tools are of current demand for high speed and high efficiency glass processing under very tight accuracy.
As a glass processing machine manufacturer, Bando proposes high quality diamond tools which fullfill all the requiremnent and customer’s demand. The products manufactured with high manufacturing technology realize improvement on your process efficiency.

The company BSA is ISO 9001

Mole Moreschi

Wednesday, March 23rd, 2011

 

 

The Italian Bologna-based tools producer for flat glass industry has started 30 years ago to manufacture grinding wheels and diamond tools for glass processing companies

Thank to its close cooperation with De Beers group Mole Moreschi offers a wide range of standart and specilized tools and wheels.

Concerning the polishing wheels they are really manufactured in Italy allowing fast delivery and hight quality level. They can be supplied with a metalic plate where teh wheel is glued or enterely in rubber.

During the last Glasstec exhibition, in Dusseldorf the company has introduced a new wheels range for cutting, covering the entire range of inquiries, from float glass to laminated glass, with continuous crown as weel than segmented crown, silenced or not.

 

  

Les blogs sur le façonnage du verre, de la pierre, machines et outils, marbreries et miroiteries:

Façonnage verre et pierre, machines et outils

Stone and glass processing, machines and tools

Meules et outils pour la transformation du verre plat, de la pierre, miroiterie et marbrerie

Wheels and tools for glass and stone processing, glass and stone industry

Applications du verre dans le photovoltaïque

Foires et évènements pour le marché du verre plat et la miroiterie

 

 

 

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