SU670463A1 - Press for pressing hollow profiles - Google Patents

Description

(54) PRESS FOR PRESSING HOLLY PROFILES

The sectional view along A-A in FIG. one; in fig. 3 is a section along BB in FIG. one; in fig. 4 shows a section along BB in FIG. one.

The press consists of a power crosshead /, a vypolnka in the wil of a closed frame, at the front end of which there is a hollow with an oval hole 2 press stamp 3, fixed by means of a pin 4, entering into hole 5 in the press stamp 3; external cannula 6, fixed in the needle holder 7; piercing traverse 8 with t gami 9 and guided by 10, fixed on the power traverse /; the holder 11 with screws 12, 13 and wedges M, 15, mounted on the piercing yoke 8; calibrating, with her, needles 16, entering into external needle 6 and screwing into needle holder 17; sleeves 18 and 19 placed in the needle holder 7 of the outer needle 6 and serving as guides for the needle holder 17 with a calibrating needle 16; central traverse 20 installed inside the piercing traverse 8 and having a right 21, fixed on the central traverse 20 of the alita 22 with a T-shaped groove 23, providing a shaky mix, needle holder 17; spherical tip 24 and bolster 25, on which the needle holder 17 rests.

The press works as follows. Before the start of pressing, the required value of the needles displacement relative to the axis of the press is determined for a given type of profile, ensuring a uniform flow of the extruded metal. After that, by turning the screw 12, the wedge 14 is raised, releasing the holder //. By turning the screw, the wedge / 5 is lowered until the holder 11, together with the needle holders 7 and 17, a. Also, needles 6 and 16 will not be offset relative to the axis of the press by a predetermined amount. Then, using a screw 12, the wedge 4 is lowered until it stops in the holder 11, which ensures its fixation on the piercing yoke 8. Thus, simultaneous displacement of the needles 6 and 16 relative to the axis of the press in the direction of the larger axis OO of the oval hole 2 of the press stamp is carried out 3 while maintaining their parallelism with the axis of the press, which is a prerequisite for the normal operation of the needles. The position of the oval hole 2 of the press stamp 3 is strictly oriented relative to the power beam 1 with the help of the pin 4 and the hole 5 in the press stamp:. Equipping the needle holder 17 with a spherical heel 24 and a tipping 25 allows eliminating the effect of distortions between the needle holder 17 and the cross arm 20 on the press operability when the needles are displaced during the pressing and when the cross arm 20 moves.

After the needles are displaced, the force bar / lowers idling. In this process, a huss-clamp 3 is inserted into the hole.

The floor preparation is similar to the press washer (not shown in the drawing). At the same time, the traverses 8 and 20, using cylinders, the traverses 8, placed on the force beam / (not shown), are lowered along the guides / O and 2 / relative to the power t-raverse /.

Moving traverse 8 down limit limit gi 9.

At the same time, the outer needle, passing through the press washer and the workpiece, stops at a certain distance from the die, and the calibrating needle 16 enters the matrix point, forming a working annular profile-forming hole.

Next, the pressing of the stamp 3 and the calibrating needle 16 is carried out with the external needle 6 fixed. During the pressing, the external needle 6 protects the relatively thin needle 16 from the force effect of the pressed metal along the entire length, except for the calibrating portion of the deformation zone. At the same time, due to further movement of the needle (as the billet is extruded with a deformation zone, there are constantly contacting new unheated areas of the needle 16, which can reduce its ability to overheat and its early failure.

After the extrusion is completed, the press washer and press residue are removed from the container, the force yoke 1 and the needles 6 and 16 fall back to the starting position, and the pressing cycle is repeated.

The use of the invention will improve the performance of the press by increasing the durability of the needles and reducing the time lost to replace them.

In addition, the ability to install needles in the position of the force equilibrium relative to the matrix point will improve the quality of the finished profile by reducing its thickness variation, which makes it possible to increase the yield by 1.2-1.5 times.

Claims (2)

1. A press for pressing hollow profiles containing a force bar with a hollow press stamp, a piercing bar installed inside it with an external needle needle entering the press stamp, and a central bar placed inside the piercing bar with a calibrating needle entering the external needle , characterized in that, in order to increase productivity and improve quality when pressing asymmetrical profiles, it is equipped with a mechanism for the controlled movement of the outer needle in a direction perpendicular to the axis of the press, transverse The die section of the press stamp is made in the form of an oval, the large axis of which is located in the direction of movement of the outer TIP and UT Q CJ up-iTiTJ . 2 A press according to claim 1, characterized in that the calibration needle is mounted on a needle holder with a spherical support. Sources of information taken into account in the examination: 1- Somov B.S. Pipe-profile presses, “Mashinostroenie, p. 1972, p. 57-s. 2. USSR author's certificate No. 268137, cl. 49 h And, 1969. Yu ipuz. g