SU1637923A1 - Tool for simultaneously rolling thread and smooth cylindrical surface - Google Patents

Abstract

The invention relates to the processing of metals by pressure, and may be used for rolling threads on captive screws. The purpose of the invention is to increase the productivity of the treatment by balancing the forces of the knurling. The thread-rolling tool is made of two parts, with one part having a threaded surface and consisting of intake, calibrating and dropping sections, and the other smooth part of the die consists of a curvilinear working section, made in the form of a parabola and a calibrating section. In the process, the workpiece, getting into the working space between rolling tools, such as flat dies, experiences an increasing rolling force from the threaded part of the tool. As the full thread profile rolls in, the force decreases, and the rolling force in the smooth part of the workpiece grows in proportion to the force reduction in the thread rolling. 11 il.

Description

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This invention relates to the field of metal forming and can be used to make captive screws.

The purpose of the invention is to increase productivity by balancing the forces while rolling threaded and smooth cylindrical surfaces.

FIG. 1 shows a movable die; figure 2 is the same, top view; FIG. 3 shows a profile projection of a die; in fig. 4 - flat fixed die; figure 5 is a view of the plate from above; 6 shows a profile projection of a die; Fig. 7 is a diagram of the planetary shaping of products; on Fig - forming segment; figure 9 is the same, top view; in fig. 10 - forming roller; in fig. 11 - tearing a section of the knurling roller.

A thread rolling tool for simultaneously rolling a thread and forming a smooth cylindrical surface can be made either as a set of dies (see Fig. 1-5) or as a threaded roller and segment (see Fig.7-11).

When performing rolling tools in the form of rolling dies, the latter include two parts (threaded A and smooth B). The threaded part of the fixed plate consists of intake 1, calibrating 2 and dumping sections 3. The second part of the plates has smooth working 4 and calibrating 5 surfaces, with the working smooth surface in the depth of the die made in the form of a parabola 6 with the beginning of the objectionable section 1 and ending at the dumping Section 3, Calibration surface of the smooth section B is located

opposite the dropping part 3 of the threaded part A. When performing knurling tools in the form of a knurling roller 7 and segment 8 (see FIG. 7), the threaded surface 9 is performed on the knurling roller 7 along its entire periphery, and the smooth part of the knurling roller 7 is performed with working 10 and calibrating 11 sites. The rolling segment 8 has an intake 12, calibrating 13 and dropping 14 parts, and the workpiece 15 is installed between the roller 7 and the segment 8.

The rolling tool works as follows (for example, a roller-segment type tool).

The blank 15 is fed into the gap between the roller 7 and the segment 8, captured by the intake part 12 of the latter. When this smooth working surface 10 comes into contact with the workpiece and forms a cylindrical surface on the workpiece 15.

The force is distributed as follows: in the area of the intake part 12, the thread of the workpiece experiences only the forces of thread shaping. Then, in the calibrating part 13, when the shaping force on the threaded part of the workpiece becomes minimal, there is a gradual increase in the force on the smooth part of the tool both in height and indentation width in the shape of the parabolic curve 10.

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When the workpiece 15 is transferred to the drop part 14 of the knurling segment 8, the smooth calibrating section 11 experiences the greatest rolling force with the least effort from thread rolling, thereby ensuring uniform tool loading along the entire length, which allows increasing the machining performance of the workpieces .

Claims (1)

Claim tool for simultaneous rolling of threads and smooth cylindrical surface, made in two parts, one of which has a threaded surface consisting of entry gauge and ejecting sections, and the second has smooth working and calibration surfaces across the width of the tool and a curvilinear working surface in depth, characterized in that increasing productivity by balancing the forces while rolling the threaded and smooth cylindrical surfaces, the curvilinear working surface in the depth of the tool is made in the form of parabolas s with its beginning at the lead-in area and ending at the discharging section of the threaded surface, while the smooth calibration surface is located opposite the discharging section of the threaded surface. FIG. 2 (Puz.tf fig.Z FIG. 6 FIG. eight FIG. ten Phage. 9 FIG. eleven