RU2320485C2 - Press for forming auger blades - Google Patents

Abstract

FIELD: machine engineering, namely press equipment designed for bending sheet metal, possibly manufacture of auger blades.

SUBSTANCE: press includes housing, hydraulic cylinder kinematically coupled with one of units for fastening blank. Housing is in the form of closed power circuit inside which hydraulic cylinder is arranged. One end of hydraulic cylinder is joined with power circuit; its other end is joined with central shaft. Said central shaft is mounted inside stationary unit for fastening blank with possibility of lengthwise motion along it and it is fixed against rotation relative to it. Stationary unit for fastening blank is mounted in power circuit at side opposite relative to hydraulic cylinder and it is in the form of sleeve with Г-shaped cutout. Movable unit for fastening blank is in the form of sleeve secured to central shaft at side opposite relative to hydraulic cylinder. Units for fastening blank in zone of Г-shaped cutouts are provided with П-shaped clamps for placing in them blank of auger blade.

EFFECT: operational reliability, lowered size and mass of press.

6 dwg, 1 ex

Description

The invention relates to the field of general engineering, in particular to press equipment for bending sheet metal, and can be used in the manufacture of auger blades.

State of the art

A known hydraulic press containing a bed made in the form of a U-shaped or L-shaped power frame, a hydraulic cylinder kinematically connected with a punch and a matrix (Polytechnical Dictionary. - Moscow, "Soviet Encyclopedia", 1989, pp. 112, 118) .

The disadvantage of this design is the lack of operational suitability, which consists in a direct dependence of the force of pressing the punch on the die and the dimensions of the workpiece on the dimensions and weight of the bed, and therefore the entire press. Thus, when increasing the diameter of the piston and the pressure of the hydraulic cylinder or the dimensions of the workpieces, it is necessary to significantly increase the dimensions and weight of the bed.

A known method of forming the blades of propellers and a device for its implementation. The auger blades can be made in the same way as the propellers and impellers of water-jet propulsion devices, when single screw or auger elements are made, followed by welding them to the pipe. In this case, for the manufacture of a single screw or screw element, a flat sheet billet in the form of an annular sector with a solution angle of less than 180 ° is used, followed by a flexible billet in a stamp with screw forming surfaces (see patent of the Russian Federation No. 2008125 C1, B21K 3/04, 28.02. 1994). Potentially, this method can be used for the manufacture of blades without limiting the diameter and thickness of the sheet; in technical essence, this method and device are closest to the proposed device. However, the volumetric deformation of the blade requires a press with a large working force, and for each size of the auger blade requires its own dies. In addition, in this way it is impossible to manufacture a single element of a screw or screw with an arc of a helical spiral of more than 180 °, and for the manufacture of a multi-turn drill screw, a large number of single elements will be required, which makes its manufacture more expensive.

Disclosure of invention

The present invention is aimed at solving the technical problem of simplifying the design of the press, the implementation of the power frame and the kinematic connections of the hydraulic cylinder with the clamping nodes of the workpiece so that an increase in the bending force and dimensions of the workpiece for the manufacture of the blade would not significantly increase the size and weight of the machine.

The technical result achieved in this case is to increase operational reliability with low weight and dimensions of the press while increasing the power of the machine.

The achieved technical effect is ensured by the fact that in the press for the manufacture of auger blades containing a rectangular frame made in the form of a U-shaped power frame, a hydraulic cylinder kinematically connected with one of the workpiece clamping nodes, the rectangular frame is made in the form of a closed power circuit, inside of which is located a hydraulic cylinder, one end of which is connected to the power circuit, and the other end to the central shaft mounted inside the stationary workpiece attachment unit with the possibility of longitudinal movement along it and fixed against rotation relative to it, the fixed workpiece attachment unit is mounted in the power circuit from the side opposite the hydraulic cylinder, and is made in the form of a sleeve with a L-shaped cutout, made from the side opposite to the hydraulic cylinder, and located in the L-shaped cutout of the movable the workpiece attachment unit, also made in the form of a sleeve mounted on the central shaft from the side opposite to the hydraulic cylinder. The attachment points of the workpiece in the area of the L-shaped cuts are made with U-shaped grips for installing the workpiece in them for the manufacture of auger blades.

These features are essential and are in a causal relationship with each other with the formation of a stable set of essential features that uniquely characterize the claimed invention and sufficient to obtain the desired technical result.

So the presence of a central shaft and its location on the same axis with the bed and the workpiece allowed to unload the bed and transfer to this shaft all the load perceived by the bed. Thus, if the pressure is applied to the working stroke area of the hydraulic cylinder, the central shaft works in bending, and if it is in the return travel zone, then in tension. This allows you to find the best option to create the maximum bending effort of the workpiece for the manufacture of the blade, either by increasing the diameter of the piston of the hydraulic cylinder when the central shaft is in tension, or by increasing the diameter of the shaft when bending, while maintaining a sufficiently small diameter of the piston.

Brief Description of the Drawings

The invention is illustrated by a specific example, which, however, is not the only one, but clearly demonstrates the possibility of implementing the invention to obtain the desired technical result.

Figure 1 shows a General view of the press in assembled form;

figure 2 is a view of figure 1;

figure 3 is a General view of the press in disassembled form;

figure 4 is a section bB in figure 3;

figure 5 is a section bb in figure 3;

in Fig.6 is a section GG in Fig.3.

The best option of the invention

According to the invention, in a press for manufacturing auger blades containing a rectangular frame made in the form of a U-shaped power frame, a hydraulic cylinder kinematically connected to one of the workpiece clamping units, a rectangular frame made in the form of a closed power circuit, inside of which there is a hydraulic cylinder, one end of which connected to the power circuit, and the other end to the Central shaft mounted inside the fixed mounting unit of the workpiece with the possibility of longitudinal movement along it and fixed from rotation relative to it, the fixed workpiece mounting unit is mounted in the power circuit from the side opposite the hydraulic cylinder, and is made in the form of a sleeve with a L-shaped cut made from the side opposite to the hydraulic cylinder, and located in the L-shaped cut-out of the movable workpiece mounting unit, made also in the form of a sleeve mounted on the central shaft from the side opposite the hydraulic cylinder. The attachment points of the workpiece in the area of the L-shaped cuts are made with U-shaped grips for installing the workpiece in them for the manufacture of auger blades.

The following is a description of an example of a specific press.

Press for the manufacture of auger blades (1, 2) contains a bed made in the form of a sufficiently thick-walled pipe 1, one end of which is connected to a fixed workpiece attachment unit, made in the form of a sleeve 2 connected to a hollow shaft 3 and provided with a L-shaped cut 4 (FIG. 3) and a groove 5, thus forming a closed power circuit together with the hollow shaft 3 and the pipe 1. The other end of the pipe 1 is connected to the ear of the hydraulic cylinder 6 located inside the pipe 1, the other ear of the hydraulic cylinder is connected to the central shaft 7 located inside the hollow shaft 3, with the possibility of longitudinal movement along it and fixed against rotation relative to its plate 8 (Figs. 3, 5 ) located in the groove 5. At the other end of the central shaft 7 with the help of a finger 9, a longitudinally movable mounting unit for the workpiece is installed, made in the form of a sleeve 10 (Figs. 2, 3), equipped with a L-shaped cutout 11 located in figurative in cutout 4 of the sleeve 2. On the sleeve 2 in the area of the L-shaped cutout 4, a U-shaped gripper 12 fixed relative to the bed is fixed, intended to fix the blank therein for manufacturing the screw blade 13, made in the form of a flat annular blank with a radial slot, and on the sleeve 10, in the area of the L-shaped cutout 11, another U-shaped gripper 14 is fixed, in which the blank for manufacturing the auger blade 13 is also attached (Fig. 3).

Press works as follows.

An annular blank for the manufacture of auger blades 13 is installed in the U-shaped grippers 12 and 14, as shown in figure 2, 6. Then, by applying pressure to the working cavity of the hydraulic cylinder 6, the Central shaft 7 is moved with the sleeve 10 and the U-shaped fixed thereon capture 14. The sleeve 2 with a U-shaped capture 12 is stationary and the workpiece 13 takes with this movement of the sleeve 10 a predetermined geometric shape (figure 3). Upon extension, the workpiece 13, in the case of rotation of the sleeve 10 relative to the Central shaft 7 and the sleeve 2, will be extruded from the grippers 12, 14, violating the given geometric shape. The plate 8, located in the groove 5, and the finger 9, connecting the Central shaft 7 and the sleeve 10, will not allow the sleeve 10 to rotate relative to the sleeve 2 and the workpiece 13, remaining in the grippers 12, 14, will take a given geometric shape. After the manufacture of the blade, it is removed from the grippers 12, 14 and applying pressure to another cavity of the hydraulic cylinder 6, the press is brought to its initial position.

The invention allows not only to reduce the dimensions and weight of the press, but also to unify the equipment, i.e. abandon the classic design of the punch and the matrix for each size of the auger blades.

Claims (1)

A press for manufacturing auger blades containing a bed, attachment points of a workpiece and a hydraulic cylinder kinematically connected to one of the attachment points of a workpiece, characterized in that the bed is made in the form of a closed power circuit, inside of which is a hydraulic cylinder, one end of which is connected to the power circuit, and the other end - with a central shaft mounted inside a stationary unit for fastening the workpiece with the possibility of longitudinal movement along it and fixed from rotation relative to it, fixed l of the workpiece mounting is mounted in the power circuit from the side opposite the hydraulic cylinder, and is made in the form of a sleeve with a L-shaped cut made from the side opposite to the hydraulic cylinder, the movable workpiece mounting unit is made in the form of a sleeve with a L-shaped cut, mounted on the central shaft with of the side opposite the hydraulic cylinder, the attachment points of the workpiece, in the area of the L-shaped cuts, are equipped with U-shaped grips for installing the blanks of the auger blades in them.

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