SU1570817A2 - Method of producing extruded tubes with thickening - Google Patents

Abstract

The invention relates to the processing of materials by pressure, and more specifically to the production of pipes and profiles by pressing, and can be used in mechanical engineering, construction and other industries. The purpose of the invention is to improve the quality of products and the efficiency of the process. Before the initial mechanical fixation of the reinforcing sleeve 7 from the side of the main die 2, an annular cutting tool 8 is installed, and before the final fixation of the sleeve 7 with the base metal the pipe is pushed along the inside surface of the sleeve, cleaning it and its shape. An annular cutting tool is made detachable, and before final fixation of the sleeve, the base metal of the pipe is extruded into an annular gap formed by the inner contour of the annular cutting tool 8 and a smaller step of the needle 4. 5 Il.

Description

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The invention refers to the processing of metals by pressure, namely, the production of pipes and hollow profiles by extrusion, and can be used in mechanical engineering, construction, and other first industries.

The aim of the invention is to improve the quality of products and the efficiency of the process.

Fig „1 presents the scheme of the beginning of the process with the cutting tool installed; in fig. 2 is a diagram of the connection of the reinforcing sleeve after its stripping with the product; FIG. 3 shows the resulting connection of the reinforcing sleeve with the product after removal of the cutting tool; figure 4 - installation diagram of the cutting tool on the sleeve; in FIGS is an example of installation of a cutting tool.

An apparatus for carrying out the method comprises a container 1, a main matrix 2, a ram 3, a needle 4, a press washer 5, an abutment 6, a reinforcing sleeve 7, an annular retracing tool 8, a workpiece 9, chips - metal 10 removed from the inner surface of the sleeve and item 11,

A cylindrical bore with a diameter d is made from the left end of the reinforcing-cylindrical sleeve 7 (Fig. 4) on the inner surface. The annular cutting tool 8 has a shaped profile. The bushing 7 is threaded for insertion of the cutting tool 8 into it. For ease of removal from the product, the cutting tool can be made detachable

The method is carried out as follows.

In the groove of the sleeve 7 install the annular cutting tool 8 having a shaped profile. The reinforcing sleeve with the cutting tool is installed in the stop-clip 6, which is then fastened. Install the needle 4, fix it, give pressure to the ram.

The press material of the workpiece is extruded into the annular point between the die and the needle and abuts against the annular cutting tool 8, sealing the area of contact of the tool with the reinforcing sleeve ,. Under the pressure of the press material, the tool 8 is forced through the inner surface of the reinforcing sleeve, and its longitudinal profile is formed by

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metal removal and the press material of the workpiece is continuously squeezed out onto the sealed surface. The loosened metal 10 is advanced by the tool towards the outflow, and then rests against the shoulder of the support 6. The tool 8 takes up a position above the smaller needle level. In this case, a gap appears between the inner contour of the cutting tool and the smaller needle level, into which the press material is pressed, which forms the front nip for straightening the product, and the necessary pressure is maintained to connect the reinforcing sleeve to the base metal of the pipe (Fig. 2) .

Stop pressing. The stop 6 and the needle 4 are unfastened. Pressure is applied to the ram, the needle 4 is moved forward, the main stage is set at the point of the matrix 2 (FIG. 3).

Fix the needle and press the main section of the tube. Remove the stop-holder, annular cutting tool 8 and the removal of metal 10,

The shaped longitudinal profile provides additional fixation of the sleeve against rotation, and the collar in front and behind the sleeve, its axial fixation.

The tool can be installed in another way (Fig. 04).

The sleeve 7 is made without a groove and installed in the stop-holder, the end of the sleeve 7 impose a mounting ring 12, the outer diameter of which is equal to the inner diameter of the stop 6, and the inner diameter equal to the outer size of the annular cutting tool 7.

The needle 4 has at its front end a step of smaller diameter than the main working step.

Example. The D16 alloy billet prepared for pressing is heated to 320-450 С, installed in a container heated to 340-370 ° С. The reinforcing sleeve of steel or titanium alloy is made with a groove and heated to 250-380 ° C. An annular cutting tool is installed in the bore of the sleeve, the sleeve having the shaped profile is installed and fixed in the container. The extruded material is extruded into the gap formed by the die and the needle, moves the cutting tool, which, in turn, cleans the oxides of the mating surface of the sleeve from oxides, which provides a stronger grip of the sleeve and the extruded product of D16 alloy.

Claims (1)

The proposed method provides high-quality reinforced pipe products. Invention Formula The method of manufacture of extruded pipes with a refinement of ed. No. 145805 characterized in that, in order to improve the quality of products and cost-effectiveness, in the process of pressing, the bushing surface mates with the product by stripping with an annular cutting tool, which is set back to the bushing surface adjacent to it, while the tool is moved along the bushing - the product to be fitted. ////////BUT  H / L HUGLL E Sh FIG. 2 G /// H M H UU ////// 8o8wyb uuJukl  /////// hfig. 6 8 L Fy QOVV eleven G2 8 Fig s