What is the function of export progressive tool?2022-05-27
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
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:
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
- 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.