Mill for cross-wedge rolling

 

(57) Abstract:

Usage: the invention relates to the processing of metals by pressure. The inventive mill for cross-wedge rolling, comprises a frame, a composite rolling mill placed in her upper and lower instrument panels and the mechanism of their wedging. Rolling crate made in the form of the upper bearing beam associated with the frame side cheeks by placing them through the cheeks prestressed pins, provided with screw jacks and conical shroud rings of providermessage material. The wedging mechanism is located under the lower tool plate and made of at least a pair of adjustable V compounds, one of which has a wedge pair with the friction angle, the smaller the angle-locking, and the other with the friction angle, large angle locking. At this camp get parts with high dimensional accuracy by increasing the reliability of operation of the mill. 1 C.p. f-crystals, 4 Il., table 1.

The invention relates to the processing of metals by pressure, particularly to mills for cross-wedge rolling axial parts of the stepped profile.

Sustentacular shafts with clips and flat movable tooling plate, based their reasons on clip eccentric shaft [1].

This mill has a significant size due to the presence of ribs surrounding the casing, and mounted in the housing shaft with clips. The design of the mill provides rigidity to 100 t/mm, which does not solve the problem of obtaining above the seventh grade accuracy. System wedging known mill imperfect and cumbersome in design.

Known analogues, the closest one is the design of the mill, taken as a prototype, containing instrumental plates with the mechanism of their wedging placed in rolling stands, made in the form of spatial, i.e. formed by the transverse beam placed on it one of the instrumental plates and pairs of levers connected between a bed and pins [2].

Known design mill has insufficient stiffness due to the anisotropy of the mechanical properties of the structural elements of the stand, resulting spacer rolling forces lead to the formation of large quantities of deflection of the upper and lower instrument panels.

Such kinematics of the mill reduces the possibility gender the reliability and prone to jamming.

The basis of the invention is to improve the dimensional accuracy of rolling parts by increasing the reliability of the mill, the increase in the rigidity of its design and manufacturability of the elements of the rolling stands and Assembly of its nodes.

This is achieved by the fact that in the camp for cross-wedge rolling, containing rolling mill placed in her upper and lower tooling plates, the wedging mechanism of tooling and adjusting shut height, rolling crate made in the form of the upper bearing beam associated with the frame side cheeks by placing them through the cheeks prestressed pins, provided with screw-jacks, and a cone-shaped retaining rings from providermessage material, and a wedging mechanism is located under the lower tool plate and made of at least a pair of adjustable V compounds, one of which has a wedge pair with an angle of friction, a smaller angle locking, and the other has a wedge pair with the friction angle, large angle locking.

Preferably, the lower mill tooling plate and two wedge pairs were attached to Alina scheme proposed mill; in Fig. 2 is a view along arrow A in Fig. 1; Fig. 3 - section b-B in Fig. 1; Fig. 4 - section b-b of Fig. 1.

The proposed mill comprises a frame 1 on which is mounted a composite rolling mill 2, made in the form of the upper bearing beam 3 that is associated with the frame 1 side cheeks 4 by placing them through the cheeks 4, the yoke 3 and the frame 1 prestressed pins 5 and coocooboonah retaining rings 6 steel providermessage material. In the guide beam 7 3 posted by the slider 8, through the rod 9 is associated with the hydraulic actuator 10 and the bearing of the upper tool plate 11 with the upper wedge tool 12. The mechanism 13 wedging is located under the lower tool plate 14 with the lower wedge tool 15 for rolling the workpiece 16.

The mechanism 13 wedging mill is made at least of a pair of adjustable V compounds, one pair of wedges 17 and 18 of which has a coupling between the friction angle, the smaller the angle locking.

The lower tooling plate 14 and a pair of wedges 17, 18 and 19, 20 are attached to the frame 1 by means of skipped through them rods 21 and calibrated springs 22 compression. A pair of wedges 17, 18 and 19, 20 is equipped with independent coil results in metricheskoi thread. A pair of wedges 19, 20 is equipped with independent coil actuator 24 for coarse adjustment of the shut height of the mill, for example, in the form of quick-release Jack with a special thread rectangular, trapezoidal, etc.

Performance wedging mill it is also necessary to reduce the time of contact of the wedge tool 12, 15 hot workpiece, because when prolonged contact of the tool 12, 15 with the workpiece in the area of the jamming occurs vacation hardened tool that leads to marriage and the failure of the tool.

A pair of wedges 19, 20 provided with tabs 25 position: working position - the position rasklinila.

The helical actuator 24 in conjunction with the tabs 25 position contributes to the performance of the exceptions provisions of the wedging mill during the rolling process, without removing the specified rate of rolling.

The latches 25 provisions automate precision adjustment of the shut height of the mill without changing the dimensional accuracy wakatani products. Combining elements rolling stands, including the frame 1, the side cheeks 4 and the carrier beam 3, by means of prestressed high-strength pins 5, banded the ti increased rigidity in comparison with analogues. Preliminary voltage high-strength pins 5 is achieved by the establishment of tensile stresses torque tightening the nuts 26 and the application of their conical rings 6. The base ring 6 internal conical surface G on the outer conical surface D of the pin 5 and under free boarding boarding cylindrical hole 27 cheeks 4 provides the fixation of the given force of tension in the material strength of the pin 5. This type of connection with pre-stress creates in the design of the frame diagram of the stress-strain state of compression, a compensating voltage tension arising from the spacer rolling forces. This helps to improve the dimensional accuracy of products.

In addition, the load pins screw jacks - holders 28, in the direction of the spacer rolling forces, mounted in the frame 1 and the traverse 3. This design build rolling stands forms a gapless connection between its constituent elements, which are aimed at increasing its rigidity.

Mill for cross-wedge rolling is as follows.

The source of the workpiece 16 serves on the axis of rolling between clinomimetite stroke to slide 8 for guide rails 7. The slider 8, which carries the upper tool plate 11, produces a straight course along the beam 3 and introduces a wedge tool 12 in the workpiece 16.

Due to friction forces arising between the instruments 12, 15 and the workpiece 16, the latter is put into rotation, which is forming by rolling. Upon completion of the forward stroke of the RAM 8 is fully laminated workpiece 16 falls from the tool 12, 15 and the slider 8 return return stroke to the starting position.

In the case of underheating or raznozazornost workpiece 16 in the process of rolling the magnitude of the spacer efforts may exceed the load capacity, which can lead to jamming of the workpiece 16 between the instruments 12, 15. In this case, an automatic switching mechanism 13 wedging, Autonomous drive 24 which is in the form of quick-release Jack rasklinivanie instantly a couple of wedges 19, 20, which contributes to the coupling between friction angle, large angle locking. In the result of wedging the workpiece 16 drops of the tools 12, 15. After that, without additional adjustment of the wedges 19, 20 of the actuator 24 will return to its working position with the mounting base adjustment by clamps 25. Then the process n the I value of the compression stress, recorded in the design of the rolling stands 2 in the process of its Assembly. Describes the work of the mill allows you to ensure dimensional accuracy of the products in the specified hard field tolerance.

The Union of the lower tool plate 14, the wedges 17, 19, 20 with the frame 1 by means of skipped through them rods 21 and calibrated springs 22 compression produce in order to exclude the Assembly clearances in the above construction and to carry out the desired amount of tension between the joint elements for their reliable operation. The use of calibrated springs 22 compression allows to damp the magnitude of the spacer efforts arising in the process of rolling parts without reducing their dimensional accuracy.

Example. To perform the rolling speed of the shafts of steel 35 with a diameter of 60 mm, the Maximum degree of compression on one of the deformed sections was equal to 2.0. The ratio of length to diameter was 3.0.

Rolling was carried out on the mill base and the claimed design. The tolerance on the drawing was 0.36 mm Rolled batch of parts from 100 pieces or more.

The data of comparative modes of rolling on the well-known mill and the claimed design of the mill are summarized in table.

As follows from the table is up 1.2-2.4 times.

1. Mill for cross-wedge rolling, containing instrumental plates with the mechanism of their wedging placed in rolling stands, made in the form of spatial, i.e. formed by the transverse beam placed on it one of the instrumental plates and pairs of levers interconnected and bed pins, wherein the pins are made pre-stressed, equipped with screw jacks and shroud rings of providermessage material, having an internal conical surface, and the mechanisms of the wedging tool plates located under other tooling plate and made of at least a pair of adjustable V compounds, one of which has a wedge resistance with friction angle, the smaller the angle-locking, and the other with the friction angle, large angle locking.

2. The mill under item 1, characterized in that the lower tooling plate and a pair of V-joints attached to the frame by means of skipped through them and tie rod calibrated springs.

 

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1 tbl

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4 dwg, 1 ex, 1 tbl

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1 tbl, 2 dwg

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