This process is used for the production of seamless stainless steel tubes, which are made of alloyed alloys with low ductility. To stitch them together on the mill virtually impossible. The extrusion of such tubes is either on a horizontal mechanical presses, either on the vertical mechanical. For pressing some low-plasticity steels and alloys is very important constant speed pressing. Hydraulic compression moulding consists of two stages: the first is the firmware of the workpiece, the second squeezing of the finished product. When used with vertical mechanical method, all these operations are performed on one press. Practice and drilling of workpieces on drilling machines in the case when pipe made from high-alloy materials. The same approach is relevant when the diameter of the socket at least 50 mm.
Vertical mechanical presses
They are used for machining of workpieces with Ø 80 — 160 mm and length up to 400 mm. Before extrusion the billet is heated to t° 1000−1280°C. Then, using a small compression in diameter of about 2−3.5%, obytnom the machine with the heated workpiece is removed from the scale. After that, the workpiece diameter must be less than the diameter of the inner sleeve of the container press 1.5−2 mm. Then to the product down the outer slide, the stamp device and the inner slide with the mandrel in the form of a needle. Then made the grimace of metal with the stamp device. This is to ensure that «extra» metal that deforms and fills the container to remove.
After this stop stamp device. Mandrel-needle under the action of the inner slide stitches in the product opening, which should correspond to the inner diameter of the pipe. While in the inner hole of the matrix includes the end of the mandrel, which pushes a small metal part having the shape of a round tube. As a result, between the end of the mandrel and the die is formed an annular gap, which is equal to the cross section of the hot pipe. Then stamp the device is lowered due to the pressure on him outside of the RAM. Along with this comes the extrusion of the metal through the same annular gap, which gives shape to the pipe.
When the squeezing is finished, the container is a metal part in a press residue, which is cut with a special hand-carved device and is pushed out of the press. Under the action of gravity pipe rolls down the inclined chute for further reduction.
To buy, price
In stock, LLC «Electrocentury-steel» a wide range of high-quality metal standard and custom sizes. Supply stainless steel pipe of various brands in retail and wholesale. All the party goods have the quality certificate on conformity to requirements of standards and technical conditions. The certificate is marked manufacturer, brand alloy, the melting number, chemical composition and mechanical properties. Implementation of orders in the shortest possible time. Wholesale buyers are offered preferential discounts.