RU2457917C1 - Device for spring hardening by aging in compressed condition - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to machine building, particularly, to device for spring hardening by aging in compressed condition. Proposed device comprises top and bottom inserts, barrel to accommodate said inserts and punch with ball surface to get in contact with top insert ball surface. Bottom insert is arranged to rotate about barrel axis while top insert rotates and displaces along barrel axis and allows its axis to deviate from punch axis. Insert end face surfaces have stop with depth making at least spring turn height and follow spring extreme turn end shape. Insert stop edge is rounded at point of contact with spring first work turn to rule out dents on first turns.

EFFECT: longer life of springs.

2 dwg

Description

The invention relates to devices for increasing the resource of springs by the method of plastic processing and can be applied in industries manufacturing and using springs - at enterprises of the military-industrial complex, mechanical engineering, aircraft manufacturing, the automotive industry, and agricultural machinery.

Known devices for contact covering the springs described in the USSR copyright certificates No. 198747, 348792, 419660, 486233, 643684, 815346, 825253, US Pat. RU 2251036, US Pat. RU 2251037, US Pat. RU 2286556, US Pat. RU 2296968. A device is also known by application No. 2007109504 [1, p. 72 ... 73].

The closest are the device according to the application No. 2007109504, containing a cup for mounting the inserts and between them the test spring, a punch with a ball surface in contact with the ball surface of the upper liner, the lower liner, the lower liner mounted for rotation relative to the axis of the glass, and the upper - with the possibilities of such rotation and movement along the axis of the glass and the possibility of deviation of its axis from the axis of the punch, characterized in that the inner diameter of the glass is made in size ranging from the diameter a compressed spring to the diameter of the wound spring, and on the ends of the liners there are surfaces with an emphasis of depth not less than the height of the coil of the spring, repeating the profile of the ends of the extreme turns of the spring to use the end moment of the spring when tilting.

When testing this device, it was noted that the sharp edge of their stops formed during the processing of the liners leaves sharp dents in the first working turns of the spring, thus cutting the metal fibers, which creates the prerequisites for the development of cracks and destruction of the spring during operation.

The technical result of the invention is to improve the device and increase the life of the springs.

The technical result is achieved due to new elements and their new connections for contacting the springs, namely, the device contains a cup for installing the inserts and the test spring between them, a punch with a spherical surface in contact with the spherical surface of the upper liner, the lower liner, and the lower the liner is installed with the possibility of rotation relative to the axis of the glass, and the upper one with the possibilities of such rotation and movement along the axis of the glass and the possibility of deviation of its axis from the axis of the punch, and on the ends of the shells, surfaces are made with an emphasis of a depth not less than the height of the coil of the spring and repeating the profile of the ends of the extreme turns of the spring, and differs in that the edge of the stops of the shells is rounded at the point of contact with the first working coil to prevent dents on the working coil of the spring when contact mocking.

When applying loads of contact shear (10 ... 300F ₃ ), the gap between the coils is selected and the coils are compressed along the line of their contact with each other, as a result of which the spring, changing the curvature of the coil, interacts with the inner diameter of the cup and the stops at the ends of the inserts. Clamped by the mating surfaces of the liners and the ends of their stops, the coils are in contact with each other and with the inner diameter of the glass. After that, the process of plastic hardening of the coil of the spring is carried out by axial forces of 10 ... 300F ₃ . In this case, the rounded edge of the stops of the liners does not touch the spring coils and therefore does not leave dents on the working coils.

Thanks to this improvement of the device, the metal of the coils is not cut, which contributes to an increase in the resource of the springs, including those working with shock or power contact of the coils.

Figure 1 shows the device; figure 2 presents a view of A.

The device consists of a punch 1 and a cup 2, in which the test spring 3, the upper shell 5 and the lower shell 6 are placed. The ends of the compressed spring are in contact with the corresponding surfaces and stops 4 at the ends of the shells 5 and 6, and the coils are in contact with the inner surface of the cup 2.

The device operates as follows. The device is mounted on a fixed table of the press, and the punch 1 is fixed to the upper movable plate of the press. The test spring 3 is inserted into the cup 2 so that the ends of the spring are in contact with the mating surfaces and stops 4 of the ends of the liners 5 and 6. Then, the punch 1 is lowered by the movement of the press, causing the spring 3 to compress, increasing its outer diameter until all its coils will not come into continuous contact with the inner surface of the cup 2. Due to the contact of the ends of the spring with the stops of the ends of the liners and the contact of the coils of the spring with the inner surface of the cup, the compressed spring will take the correct geometric shape . Due to the presence of a spherical surface on the punch 1 and the upper liner 5, the press force is evenly distributed along the diameter of the compressed spring through the mating surfaces of the liners. In this case, the rounded edge of the liner stop does not touch the first working turn and does not leave a dent on it. After the required exposure under load, the punch is lifted, the spring is removed from the device.

The advantage of the claimed device relative to the known lies in the fact that the rounded edge of the liner stop does not leave dents on the first working turns of the spring during contact gouging to prevent breakage of the first turns of the springs during operation and to increase their service life.

Information sources

1. Tebenko Yu.M. Problems of production of high-speed springs and ways to solve them. Monograph. - Stavropol: LLC “Data World”, 2007, - 152 p.

2. Kryukov B.N. On the effect of contact stresses from the collision of coil springs on their survivability. / B.N. Kryukov // Production and Technical Bulletin. - 1977. - No. 4. - S. 58-61.

Claims (1)

A device for contact covering the springs containing the upper and lower liners, a cup for installing the liners in it and between them springs and a punch with a spherical surface in contact with the spherical surface of the upper liner, while the lower liner is mounted to rotate relative to the axis of the glass, and the upper with the possibility of rotation and movement along the axis of the glass and deviation of the axis from the axis of the punch, and the glass is made with a size of internal diameter ranging from the diameter of the compressed spring to the diameter of the wound spring They are, and on the ends of the shells, surfaces with a stop are made, repeating the profile of the ends of the extreme turns of the spring and with a depth of not less than the height of the coil of the spring, characterized in that the stops of the shells at their contact with the first working coil of the spring are made with rounded edges to prevent dents from leaving them at the first working turns of the spring and eliminating breakage of the first turns of the spring during operation.

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