Magnetic plates is a type of machine tool that is used on metal—cutting machines to fix workpieces made of ferromagnetic materials during processing by cutting or grinding a tool. tool.

The workpieces are fixed on the plate by a magnetic field, without mechanical action, which eliminates damage to the part. Magnetic plates are manufactured according to GOST 16528-87, there are accuracy classes H, P, B, A, C, with manual or remote control.

Types of magnetic plates

According to the principle of creating a powerful magnetic field, all plates are divided into two types:

• mechanical, simply referred to as magnetic plates;

The magnetic mechanical plate is represented by a set of permanent magnets arranged in such a way that the clamping of the part is created by a magnetic field. In the switched-on state, its power lines pass through the poles of the magnets, the steel inserts of the upper part and the body of the fixed workpiece. Turning off such a plate is performed by shifting the matrix with permanent magnets relative to the steel magnetic circuits, as a result, the magnetic flux through the workpiece sharply weakens, freeing the part. The movement of the block with magnets is controlled by an eccentric mechanism driven by an outward-facing handle.

The main advantages of a mechanical magnetic plate are:

One of the varieties of a mechanical magnetic plate are the so-called sine plates, which ensure the position of the workpiece at an angle to the plane of the table. There are single-turn and double-turn sine plates. Single-rotations allow the part to tilt along one axis, double-rotations, respectively, on both.

• electromagnetic, in which the magnetic field is created by electric magnets.

An alternative to the mechanical, electromagnetic plate of machine tools instead of permanent magnets is represented by electromagnets powered by an external power source. There is a distinction between ordinary ones with a standard distance between the poles and small-pole ones with shortened interpolar spaces. The latter are widely used in machines that process small parts.

The advantages of an electromagnetic plate are considered to be:

However, there is one significant drawback – in the event of a power failure, the workpiece is torn off the work surface.

Magnetic plate design with manual switching

The principle of operation of the magnetic plate

The plate is switched on and off by moving the central magnetic assembly A. When the magnets are aligned with the steel plates on the upper plate B, the magnetic forces are directed at the fixed part. When the magnetic assembly is shifted relative to the plate, the magnets "lock" onto each other, and the attraction of the part does not occur.

Basic dimensions of magnetic plates according to GOST16528-87

Other types of magnetic plates

Single-turn sinus plates

Two-turn sinus plates

Rectangular reinforced plates (PMSPU)

In terms of gravity, this type of product significantly exceeds the "ordinary" GOST plates. The specific gravity is at least 180 N/cm2.>. The remaining characteristics (except for weight) comply with GOST 16528-87.

Round plates

For round worktable machines

Application of magnetic plates

It is advisable to use magnetic plates when you need to fix a small part. An important advantage of this fastening method is the accuracy of installation during the entire processing period of the product. As a rule, magnetic plates of various types are not included in the basic equipment of the machines and they have to be purchased separately. The main parameters to consider when choosing are:

Choosing a magnetic plate based on the above parameters allows you to choose the best option for specific machines.

Manufacturers of Magnetic Plates

1. GOST 16528-87

2. https://mekkain.ru

3. https://p-s-m.ru

4. https://redmag.ru

5. https://sar-snab.ru

6. https://irvelprom.ru

7. https://npp-magnit.ru