RU2479371C1 - Tool for forming tubes at vertical press - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in making long steel tubes by hot forming at vertical press using glass grease. Proposed tool comprises container lower die unit, needle with holder and ram with die. Cores with taper end and head are radially arranged in die. Said cores may displace. Core heads are located on die outer side. Ring is fitted on die and aligned therewith. Ram has ledge with annular groove to support die. Tape ends of cores are fitted in ram annular groove and locked by said ring before and in forming. Said ring may be deformed by cores in shifting after forming during lift of ram to allow removal of die from ram.

EFFECT: expanded processing performances, reduced heat losses.

1 dwg

Description

The invention relates to the field of metal forming, and in particular to the manufacture of large pipes by hot pressing on vertical presses.

An analogue of the invention is a monolithic press stamp, the end of which is made in the form of a press washer (see, for example, Zholobov V.V., Zverev G.I., Perlin I.L. Metal pressing. - M., 1959 , 543 pages, on pages 307-312, fig. 228). The movable assembly of the tool consists of a stamp, a needle holder and a needle. The needle holder with the needle is attached to the stamp.

The disadvantages of the analogue include the impossibility of pressing steel using glass lubricants, since the ingress of glass lubricants between the stamp and the container during its cooling wedges the tool and causes its increased wear and premature destruction. Therefore, when pressing steel with glass lubricants, a stamp block is used with a separable stamp and a press washer.

The prototype of the invention is a stamp with a press washer supplied to the press together with the workpiece by the feeder blanks, which are pushed into the press with a press stamp (see, for example, Shevakin Yu.F., Gleiberg A.Z. Pipe production. - M ., Metallurgy, 1968, 248 pages, on pages 232-234, Fig. 119). The press tool consists of a container, a matrix unit, a needle with a needle holder and a stamp with a press washer.

The process of pressing non-ferrous metals and alloys is as follows. The matrix block is placed on the pressing axis, the container is pressed against the matrix block. A billet heated to a pressing temperature with a press washer is fed to the pressing axis. The press stamp pushes the workpiece into the container together with the press washer to the matrix unit. After pressing the workpiece and piercing with a needle, pressing is performed. After pressing, the pieces of the press product and the displacement of the matrix block press the remainder with the press washer is pushed out of the container with a press stamp. Then the press stamp and the needle with the needle holder are returned to their original position, and the matrix unit is fed to the pressing axis.

For pressing steel pipes, the sequence of operations is somewhat different. A lubricating washer placed at the matrix unit is fed into the container. The workpiece, heated to a pressing temperature, is coated with glass-lubricant on the inside and outside. After applying grease, the workpiece and the press washer installed behind it are fed to the pressing axis. The needle is moved through the press washer and the workpiece, which helps to fix the press washer. By moving the press stamp, the workpiece with the press washer is pushed into the container. After extrusion, the billets are pressed and pipes are extruded. After pressing, the needle with the needle holder is returned to its original position, the press stamp is pushed back, the pipe is cut and removed, the matrix block is moved from the pressing axis, and the press residue with the press washer is pushed out of the container with a stamp. Then the stamp is returned to its original position, and the matrix unit is served on the axis of pressing.

The disadvantages of the prototype include the inability to use the specified sequence of operations for pressing steel pipes on vertical presses with a piercing system. This is due to the difficulty of fixing the press washer on the stamp.

The technical result of the invention is the expansion of the technological capabilities of the press equipment by pressing steel pipes using glass lubricants on vertical presses with a piercing system and reducing heat loss from the heated billet and the time from feeding the heated billet to the container axis until the end of pressing.

The technical result is achieved by holding the press washer on the stamp before pressing and making it possible to remove the press stamp from the press washer when it is retracted to its original position. This is achieved due to the fact that the tool for pressing steel pipes on a vertical press using glass greases, containing a container, a matrix unit, a needle with a needle holder and a stamp with a press washer, is provided with pins that can be radially placed in the press washer, made with a tapered end and a head located on the outside of the press washer and a ring located on the press washer and coaxially with it on the side of the pin heads, the press stamp is made with a protrusion with a circular groove on which m, a press washer is installed, made with a collar, while the pins are installed with conical ends in the circular groove of the stamp and are secured against movement by means of the aforementioned ring in order to fix the press washer on the press stamp before and during pressing, while the ring is located supported by the collar of the press washer and made with the possibility of deformation by pins when they are displaced after pressing when lifting the stamp to ensure the exit of their conical ends from the circular groove of the stamp la and removably press washer with the ram.

The tool for pressing is presented in figure 1.

The tool contains a press stamp 1, pins 2, ring 3, a press washer 4, a needle 5, a container 6 with a workpiece 7, a grease washer 8 and a matrix unit 9.

Using the proposed design is as follows.

Before starting work, the tool is assembled. To do this, put on a press washer on the protrusion of the stamp and fix it with pins. To prevent the pins from popping out due to the weight of the press washer, they are fixed with a ring on the outside of the pins.

The grease washer is mounted on the matrix unit. After placing the workpiece in the container, the needle is fed into the cavity of the workpiece, then the workpiece is pressed and pressed by means of a stamp.

After pressing, the glass grease that has fallen into the gap between the container and the press washer holds the press washer and press residue at the matrix unit. When lifting the stamp, the pins are shifted towards the retaining ring, deform it and exit the groove of the protrusion of the stamp, separating it from the press washer. After removal of the pressed pipe (using a cutting device or a cutter), the press washer with the press residue is pushed out of the container with a press stamp.

It is advisable to use this technology when pressing large-sized steel pipes on powerful vertical hydraulic presses.

Thus, the present invention allows to expand technological capabilities and increase the durability of the pressing tool when pressing steel pipes with glass lubricants due to:

- fixing the press washer on the stamp before pressing and in the process of pressing;

- ensuring the removal of the press washer from the press stamp when it is lifted after pressing is completed and the press residue is pushed out with the press washer by the press stamp after lifting the container.

Claims (1)

A tool for pressing steel pipes on a vertical press using glass greases, comprising a container, a matrix unit, a needle with a needle holder and a stamp with a press washer, characterized in that it is provided with pins made radially placed in the press washer, made with the conical end and the head located on the outer side of the press washer, and the ring located on the press washer and coaxially with it on the side of the heads of the pins, the stamp is made with a protrusion with a circular groove on which a press washer is made with a collar, while the pins are installed with conical ends in the circular groove of the stamp and are secured against movement by means of the aforementioned ring to secure the press washer on the stamp before and during pressing, the ring being located with resting on the collar of the press washer and made with the possibility of deformation by pins when they are displaced after pressing when lifting the stamp to ensure the exit of their conical ends from the circular groove of the stamp and and press the puck to the ram.