Month: May 2022

The design of open and closed export progressive tool has only one, but very significant difference. The former have a special gap that receives excess metal squeezed out of the progressive tool strands.

This gap allows export progressive tool without the need to calibrate the mass of work pieces with high accuracy: excess metal (if any) is simply released into the flash and then removed.

Advantages and disadvantages of export progressive tool

Firstly, progressive tool in open dies is good to use much more frequently. In technological terms, Secondly, it is simpler, and the range of parts produced with its help is wider.

This type of hot die forging has no restrictions - neither in terms of the shape of the products, nor in terms of their mass, or in terms of the physical and chemical characteristics of the steels good to use, nor in terms of the technological complexity of the production process.

The disadvantages of export progressive tool are the increased consumption of metal and the need to perform the technological operation of trimming the flash.

Fleshless production of forgings

Closed export progressive tool have no gaps. The engravings of the stamp are connected tightly, excluding any possibility of releasing excess metal.

This means that the work piece must calculate as accurately as possible, otherwise the die simply will not close. Eventually, accuracy in fleshless progressive tool plays a very important role!

If the work piece needs complex processing, each next technological transition should begin only after trimming the flash. This increases the cost of products and slows down production.

To reduce the wear of fleshless dies

Moreover, mechanical and thermal loads on dies good to use in fleshless progressive tool are extremely high. That is why the service life of closed dies is about 5000 forgings.

The introduction of alloying export progressive tool into the composition of die steel and the application of thermal hardening techniques to freshly cast dies makes it possible to slightly increase their service life, but inevitably increases the price.

The manufacture of parts in them is usually divided into two stages

• Preliminary
• Final

The first performs on a preliminary stamp, which has a rougher relief. Furthermore, he tells the export progressive tool the basic parameters of its dimensions and assumes the main wear. In addition, the final fleshless dies have a more complex relief - they complete the deformation transformations of the export progressive tool, processing it with high accuracy.

Stamps for trimming flash

Further, flash trimming is a high-precision technological operation. Export progressive tool that are both cold and hot subject to it. Subsequently, the technology for trimming the outer and inner flash is fundamentally different: the outer flash scraps off, while the inner flash (bridges) knocks out.

Flash trimming comes in three types of dies:

• Simple;
• Consecutive;
• Combined

In this case, the matrices of trimming dies can be both solid and composite. The latter designed to work with details of complex curvilinear configuration. Due to their design, such stamps very often warp from heating, eventually losing their ideal shape. This can lead to jamming of blanks and punches.

The main parameters that must calculate before trimming the flash are

As well as, the dimensions of the export progressive tool gaps between the punch and the matrix, due to the shape of the part;

• Design and method of fastening the punch;
• Design and method of fastening the matrix;
• Type of strippers (good to use to remove the stripped flash);
• Impact force on the flash

In addition, the latter depends not only on the thickness of the formed flash, but also on the mechanical properties of the export progressive tool of which it composes.

The punch is an integral part of the trimming die

In fact, not only the cutting edge of the matrix, but also the punch, which can be both pressing and cutting, is of great importance for the quick and most complete trimming of the flash. Punches of the second type are much less common and are good to use only with forgings of small thickness (up to 2 mm).

Like the matrix, the punch is made for a specific forging, acting on its most mechanically strong areas. If the punch is not designed correctly, it can damage the product, causing it to significantly deform.

Export progressive tool dimensions

The final finishing of the punch is made by a metalwork method. The standard for it is a part or a control casting. Fitting to the matrix ​​​​produces in a similar way, in compliance with the gaps provided for by the technology.

High surface quality of forgings achieves by their cleaning. Cleaning is a technological procedure for removing scale, traces of rust, as well as a variety of contaminants from stamped parts and blanks. At the same time, violations of the shape and dimensions of products or changes in their physical and chemical properties should not allow.

Forgings can be cleaned in the following ways

• Export progressive toolmechanical cleaning;
• Jet-abrasive cleaning (subdivided into pneumatic-abrasive and hydro-abrasive).
• vibro-abrasive cleaning
• tumbling in drums
• shot cleaning
• etching;
• Export progressive tool for Fire cleaning.

Of all these methods, mechanical cleaning is the most widely good to use, the simplest in technical terms. However, this method is not acceptable in all cases. Pickling (chemical cleaning of forgings with sulfuric, hydrochloric or phosphoric acid) has the greatest versatility, although it is more expensive.

General information about the methods good to use today for cleaning forgings

Method name	Equipment for cleaning	Application area
mechanical cleaning	Stationary roughing and grinding machines, wearable electric grinding hand tools, as well as a variety of scrapers and brushes	· The method is universal for small, medium and large workpieces of simple shape and without recesses.
Hydro-abrasive cleaning	Drum and continuous conveyor hydraulic installations	· The method is optimal for removing surface defects of different depths, cleaning scale and dirt
Pneumo-abrasive cleaning	Sand throwers of various capacities	· export progressive tool Can be good to use for removing small surface defects and fine grinding

Conclusion export progressive tool

Lastly, there are also combined export progressive tool that simultaneously push the part through the die edge and extrude the webs. The calculation of such punches is especially difficult. The punch is fastened in two ways - directly on the press slide or on the adapter.

The first is preferable when working with large-sized work pieces, the second - with medium and small ones.

Types and methods of modern metal stamping

Firstly, metal stampings is a controlled deformation process in which a body changes its shape under the influence of excess pressure.

Thanks to this processing, metal products are given a wide variety of forms that they need to fulfill their functional duties. Parts of small thickness lend themselves to stamping, since it is very problematic to bend thick products.

COLD STAMPING OF METAL

There are two types of metal stamping: cold and hot. The first option involves processing the work piece without preheating it.

Metal stampings method is cheaper in terms of industrial production, since it does not require energy to bring the metal to a certain temperature. In this way, mainly thin sheets are processed, which are well affected even without heating.

The sheet metal cold forming process divides into several stages, each of which plays an important role in obtaining the final result.

At the initial stage

A compaction process performs, which reduces the ductility of the metal so that the product better holds the shape obtained as a result of stamping. Technologically, the process is a pressing of a metal blank under high pressure.

At the second stage

Products are annealed at temperatures of 550-620 degrees Celsius in special furnaces. This makes it possible to carry out the procedure of recrystallization of the metal lattice and the introduction of carbon atoms into it at the molecular level, which can significantly increase the strength of the metal.

The annealing time depends on the composition of the alloy and the dimensions of the work pieces. When the preparation is over, the product is sent to a cold metal stampings press, which will give it the desired shape.

The procedure method takes how many times?

In terms of time, the procedure takes a few seconds and does not require human intervention. The presses use special dies made of hard grades of steel, less often of other alloys. They design for long-term operation, during which they retain their original shape to the nearest millimeter.

This is very important, since metal stampings cold stamps for specific needs, and deviations in the shape of the finished product are unacceptable, as this can lead to mismatches with other parts.

This method is harmless to the operating personnel, since they do not have to be in an area with high temperatures. In addition, the absence of the need for preheating makes it quite easy to automate the workflow.

HOT METAL STAMPING

Hot metal stampings allows you to process thicker work pieces, since in a hot alloy intermolecular bonds are much weaker, and it lends itself better to bending. Before starting the procedure, metal products go through the same preparatory stages as in the case of cold stamping.

But metal stamping equipment is already significantly different. It consists of two main parts:

 

A furnace and a press 

The furnace is good to use to preheat the work piece to the red heat temperature. In this form, the alloy lends itself well to physical impact and at the same time there is no risk of burnout.

To create optimal conditions inside the furnace, modern machines equip with a high-precision automated control system. It only requires setting the initial parameters, which depend on the type of work piece.

Hot metal stamping is made from?

The computer will take care of the rest. Hot metal stampings presses are made from hard, high-alloy steel grades that undergo additional processing to increase resistance to thermal stress.

They must withstand a certain number of technological operations without losing their original characteristics, so it is very important to use the highest quality material for their production.

Hot metal stampings requires the direct participation of a person in the production process. The work piece cools quickly under normal conditions, so it must quickly deliver from the furnace to the metal stamping machine.

This is done by a worker who, with the help of blacksmith tongs, transfers the product to the right place.

Subject to the galvanizing procedure

Working in an environment with a constantly high temperature regime negatively affects the body, so it is necessary to correctly calculate the duration of shifts in order to minimize the harmful effects of conditions on workers.

Process automation also faces great difficulties and requires high costs, so it is practically not good to use anywhere.

No additional equipment is good to use to cool the parts, they cool down naturally. In most cases, after metal stampings, no additional processing of parts requires. The exception is products for the automotive industry. Sometimes when stamping sheet metal, it becomes necessary to cut off excess elements. For this, a special machine with a high-precision cutter is good to use.

LIQUID METAL STAMPING

In addition to the two listed methods, there is another one that is good to use much less frequently. It implies liquid metal stampings of metal or so-call pressure casting, when the alloy pours into a closed die in a liquid state, and the final formation of the product takes place already in solid form.

This makes it possible to obtain ideally shaped parts with improved mechanical properties. The high cost and complexity of the technological process prevent the widespread use of the method at this stage.

Metal stamping equipment

Metal stampings technology is good to use to produce a wide range of products for various industries. In this way, car body parts, various panels and finishing materials, housings for household appliances obtain.

Stamping is one of the oldest methods of metal processing that survives to this day. The technology change, but the principle remains the same as many years ago.

With the help of volumetric Metal stampings, products of the most diverse shapes obtain. These are special corners that are good to use in anchor bolting, and various elements for equipment, and parts good to use in the manufacture of devices, assemblies and assemblies for all industries.

Conclusion

Metal stampings products allow you to get a part of almost any shape, which cannot achieve with other types of processing. This has been successfully good to use in steel mills. It can quickly adapt to new market needs. You just need to make a stamp of the required shape and you can start producing new products.