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How to sharpen guillotine knives

Category : BLOG

The processing of materials requires them to be properly sized already at the stage of preparing the raw material. One of the most frequently used solutions is guillotine cutting, i.e. it takes place with the use of blades lowered in the vertical plane, which penetrates the cut structure due to pressure. An important element of this type of machines are the cutting edges used in them, which must retain their geometry and at the same time guarantee the appropriate strength. As they wear out during operation, their shape must be reproduced by the process of sharpening guillotine knives. Let’s see what it looks like.

What is involved with the use of guillotine blades?

The geometry of the guillotine blades and the type of alloy they are made of depends on the type of materials being cut. In the case of cutting cellulose products, as well as products of the printing industry, they can even be made of tool steel, and their sharpening consists in obtaining an inclined edge at an angle depending on the hardness of the products handled. Similar rules apply to cutting plastics and wood-based products, e.g. veneers. When it comes to cutting sheet metal, the material used to make the knife must be harder. It can be, for example, high-speed steel, but also an alloy with the addition of cemented carbide. The blades are often coated to increase hardness. For cutting metal, the angle at which the knives are sharpened is usually close to 90 °.

Who can sharpen guillotine knives?

Sharpening guillotine knives requires experience and the use of appropriate equipment that will be able to plan the surface of the cutting edge with the required precision, and at the same time handle the hardness of the material used. This service is performed only by companies with advanced metal processing facilities. For many years, MultiMasz has been producing custom-made guillotine blades for steel cutting and sharpens blades for sheet metal processing.

How to get parts for Russian lathes?

Category : BLOG

Lathes are commonly used in various industries machine tools that are used to perform machining. Thanks to their use, it is possible to carry out finishing machining of objects in the shape of solids of revolution (e.g. shafts, balls, internal and external threads or cones). In order for lathes to function efficiently, ensuring efficient and effective work, they must be maintained in impeccable technical condition. As in the case of other machines, the most important role in keeping them in motion is played by regular technical inspections, during which all necessary repairs are made. Some worn parts of lathes can be regenerated, others need to be replaced with new ones.

How do lathes work?

The operation of lathes is quite simple. The workpiece to be machined on this machine is first clamped in the chuck or centers. Turning is done by putting it in rotation. During subsequent rotations, its surface is gradually cut with a specialized machining tool. Currently, an increasingly popular solution is the use of numerically controlled lathes, i.e. CNC machine tools.

What to do when you need to buy spare parts for a Russian lathe?

The condition for repairing the lathe is the purchase of appropriate parts. If you use a Russian lathe or boring and milling machine in your facility, it is important to source parts from Russian manufacturers. Thanks to this, you can be sure that they will fit perfectly, guaranteeing smooth, effective and trouble-free operation. Since many years our company has been cooperating with eastern manufacturers of machines and equipment, thanks to which we have prepared a wide range of various spare parts for Russian lathes for our customers. You will find parts for both universal center lathes 1K62, 1M63, 1M65 and vertical lathes 1512, 1516, 1525.

You can buy mechanical and electrical parts from us, such as: shaft mounted clutches, electromagnetic brakes, clutch plates, pneumatic clutches, brush holders, clutch shafts, friction plates, discs, gears and shafts, valves and distributors, oil pumps, oil filters, step selectors or slide switches for vertical lathes.

Part and components of grinding machines. Components overview

Category : BLOG

Grinding is one of the operations in metalworking, thanks to which the required parameters of the part are obtained both in terms of accuracy and surface quality. There are many types of grinders due to the method of processing as well as the type and shape of the part to be machined. Therefore, grinders are built for grinding rollers, for grinding flat surfaces, tool grinders for small but precise details or regeneration, e.g. by sharpening tools. There are also grinders for grinding machine bodies, which are characterized by the ability to process large-size details while maintaining the required machining accuracy.

Basic types of grinding machines used in production:

  • Cylindrical grinding machines external/internal
  • o Center ginders (e.g. A440, E450, E550, SWA25, SWB25, BUA)
    o Centerless grinders (e.g. MC50, SASL200)
  • Surface grinders (e.g. SPC20, SPD30, SPD40, SAB100W)
  • Tools grinders (e.g. NUA25)
  • Special grinders

Unfortunately, like any device – and especially a machine that is expected to work stably and accurately – the grinder also requires constant supervision over the wear of its elements, and in order to ensure the continuity of operation, it is necessary to additionally ensure proper inspection of the machine and replacement of wearing parts. It is important to remember – as with any repair – to use only parts from trusted suppliers who are able to ensure their proper quality, which will ensure further trouble-free use of the grinder in accordance with its intended purpose and expected performance.

What are the most common spare parts for grinding machines?

  • Headstocks with rolling and sliding bearing spindles
  • Bodies with sliding guides
  • Travel drive screws with bearings
  • Machine control hydraulic cubes
  • Grinding wheel holders mounted on spindles
  • Table turning bumpers
  • Operating levers
  • Components of the machine’s hydraulic system (solenoid valves, pumps, pressure gauges, hoses, filters, etc.)
  • Arbors for static balancing of grinding wheels
  • Grinding drivers
  • Electromagnetic tables for surface grinders
  • Bearings

Check also: Jotes grinding machines.

What are the most important recommendations when using metal grinding machines

Category : BLOG

Metal processing requires the use of specialized machines in order to obtain the appropriate accuracy of parts and their quality. The final accuracy of the parts is achieved thanks to the use of stationary grinders in the technological cycle.
Thanks to the selection of appropriate grinding machines and the use of appropriate cutting tools (grinding wheels), we can process virtually any material, achieving very high accuracy of details.

What are the basic types of stationary grinders

Grinders are machines that allow processing of wrkpiece made of various materials and of various shapes while maintaining the required accuracy and surface quality. We can distinguish surface grinders (e.g. Polish production SPC20, SPD30, SPD40, or SAB100W carousel grinder with a round rotary table), cylindrical grinders with the possibility of grinding holes (e.g. SWA25, E450Np licensed by the German company SCHAUDT), tool grinders, e.g. NUA25), and centreless grinders for grinding cylinders characterized by very high efficiency in serial and repeat production).

How to properly use a metal grinding machine?

The stationary grinders offered on the market today are very functional, efficient and accurate tools. Nevertheless, if we do not take care of the correct use of our machine, we can expect a reduction in the accuracy of machining, and even frequent failures. Grinders, just like any other machines, are intensively used and the lack of supervision over their proper technical condition may cause frequent downtime due to the need for repairs. In extreme cases, in case of improper operation of machines, the technical condition of the machines deteriorates very quickly and forces costly major repairs to be carried out in order for the grinder to regain its functionality and accuracy. At the same time, working on a damaged machine poses a threat to the health and life of both the operator and co-workers staying next to the processing station.

How to perfectly choose a magnetic chips separator for a grinding machine?

One of the factors that enable the desired grinding results to be obtained in the grinding process is the proper selection of the coolant and keeping it clean. Improper coolant can cause, among other things, the formation of corrosion centers on already finished parts. For this purpose, it is recommended to use magnetic coolant separator (magnetic filter) in the coolant system, which clean cooling fluid from the residues formed during the grinding process. It is important to always choose only the highest quality products, which is what MultiMasz offers. The Polish MMA series magnetic filters are perfect for the processing of magnetic materials, because the coolant purification process is carried out by a drum with magnets capturing impurities, and the cleaned coolant can be reused. Due to the fact that the filter works in a closed circuit, we achieve significant savings in the amount of used coolant.

When selecting the size of filters, the efficiency of the machine’s coolant system should be taken into account. To select the correct size, check the maximum capacity of the coolant pump mounted on the coolant tank and the filter capacity must be greater than the pump capacity.

What parts do metal milling machines consist of?

Category : BLOG

A metal milling machine is a device that is indispensable for metalworking. Thus, it should be an important part of every metalworking workshop equipment. Milling machine is a kind of specialized machine tool, thanks to which one can realize precise machining of different metal parts and details. With its help you can give shape to metal parts. Without a reliable metal milling machine, such parts as threads, profiles, spindles, gears or keyways, for example, could not be created.

Metal milling machine can perform such work as:

  • shaped milling – in this case, the cutting edges must be located on a rotating body with a complex outline,
  • cylindrical milling – in this type of milling, blades with cutting edges arranged on the surface of a cylinder are used,
  • face milling – during this type of machining, the axis of rotation of the cutter is perpendicular to the surface on which the machine tool is set.

How is a metal milling machine built?

What can we say about the key components of a milling machine. We can distinguish here the body, the console (in the case of a console milling machine), the cross slide, the table, the speed and feed box, the electric motor, the spindle, the sliding (cantilever) bar, the center support, the edge support and the stiffening bars. An extremely important component of the modern metal milling machines is the swivel head. The swivel head for milling machine allows to machine the material precisely at different angles, even in very hard-to-reach places. Not less important tool of any metal milling machine is the cutter, which is shaped like a rotating solid, which gives the final form to the workpiece.

At MultiMasz Company you will find reliable accessories and tools for milling machines – not only swivel milling heads, but also new slotting heads for milling machines, dividing heads and machine vices.

There are three most popular types of metal milling machines: vertical, horizontal and universal.

Modern milling machines are made of very resistant to intensive use of materials, so they are characterized by long life and reliability. They can be equipped with electronic control modules that provide easy, intuitive operation, as well as high-performance cooling systems, a central lubrication system and a 3-axis digital position readout.

Criteria for selecting steady rest for a lathe

Category : BLOG

Thanks to machining one can produce parts with high dimensional accuracy and an excellent level of surface finishing, as long as it is carried out using equipment with the right performance characteristics. When it comes to the lathes, not only the machine itself is important, but also the tools we use, as well as accessories that facilitate the desired precision, including the use of an appropriate steady or follow rest.

What is the role of the lathe steady rest?

Turning machining involves the removal of excess chips from the workpiece, which is put into rotation with a strictly set number of revolutions, using a lathe knife with an appropriately shaped cutting edge and moved along a carefully selected path with a properly set feed speed. During the entire process, the material is affected by forces related to the rotary motion itself, as well as the work of the turning knife, which can result in deviation from the axis of rotation in accordance with the direction of the feed, that is, sideways as well as upwards, which is a consequence of the resistance posed to the cutting edge by the structure being machined. In the case of workpieces of small size, most of the impacts of this kind are offset by stable seating in either the center or the chuck, and sometimes the combination of chuck and center. If, on the other hand, the workpiece lenght is much longer, and the rigidity of the clamping system and the material itself proves to be too small, vibrations will occur. The way to deal with this problem is to use a device called a lathe steady rest which provides an additional point of support, thereby increasing stability and minimizing the risk of vibrations leading to the appearance of machining inaccuracies.

What are the common types of rest used in the lathe?

Lathe supports come in two basic variants – fixed steady (steady rest) or movable (follow rest). Fixed supports are installed on the guides of the lathe bed, which makes it not change its position in relation to the workpiece, limiting the range of motion of the tool. This means that the fixture must be changed if the entire surface of the workpiece needs to be shaped. Movable supports – follow rests – are attached to the lathe slide, which makes it change its position during turning, maintaining a constant distance from the lathe knife. Steady and follow rest can be equipped with 3 or 4 axis positioning elements They are also made in hydraulic self-centering versions, which improves handling, automating the positioning process.

A wide range of tooling for machine tools can be found in the offer of the company MultiMasz POLAND. It offers not only the purchase of fixed and movable supports, but also vibration isolators, setting wedges and coolant lines, among others.