RU2523645C2 - Device for reeling and flanging of hollow parts - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: movable mechanism with folding roller, mandrel with drive and props with crossbar mounted thereat are arranged at the bed. Besides, there are working roller with two independent drives and hydraulic cylinder with gas chamber arranged at said crossbar to develop constant force to be applied by working roller to workpiece. Note here that one of said independent drives controls said crossbar while another one initiates to turn of said props.

EFFECT: precise shape of finished parts.

5 dwg

Description

The invention relates to the processing of metals by plastic deformation to obtain hollow shells of sheet metal.

A device for rotary hoods is known, consisting of a frame with fixing elements of the workpiece mounted rotatably, rolling rollers moving along the forming frame. On a small diameter of the frame there are grooves whose length does not exceed the size of the technological allowance of the manufactured part. The number of grooves, their dimensions are calculated, and the maximum depth of the groove is located at the end of the frame and then decreases towards a large diameter of the frame (Patent RU No. 50447, B21D 22/16, Publ. 20.01.2006).

The main disadvantage is the unacceptable deviation of the shape of the obtained product from the profile of the frame due to the deformation of the workpiece during processing.

Close in design and principle of operation is a machine for rolling metal. The machine contains a mandrel with the ability to rotate, an instrumental roller acting on the workpiece from a metal sheet and pressing the sheet to the mandrel. The machine contains linear drives that control the instrumental roller, an operating switch for working in manual or automatic mode, a memory unit. (Application US No. 2007/0271982, B21D 22/14, publ. 29.11.2007).

The main disadvantage of the device is the inaccuracy in the shape of the resulting product due to variable deformations of the workpiece during plastic deformation due to the technological tolerance on the workpiece.

The objective of the invention is to improve the quality of products and reduce costs.

The task is ensured by the fact that the device for rolling hollow products contains drives, a mandrel and a tool roller. The tool roller further comprises a hydraulic cylinder with a gas cavity, which creates a constant force of action of the tool roller on the workpiece during plastic deformation. The hydraulic cylinder mounted on the traverse has two independent drives for controlling the tool roller. In addition, the device comprises a movable mechanism with a flanging roller for flanging the edges of the workpiece.

Figure 1 shows a General view of the device.

Figure 2 shows a front view of the device.

Figure 3 shows a side view.

Figure 4 shows a top view.

Figure 5 shows the roller clamping mechanism.

A device for rolling out hollow products includes a base 1, on which a rotation motor 2 is mounted, transmitting rotational movement through belt drives 3 and 4 to mandrel 5 (Figs. 1, 2). The traverse 6 is mounted on racks 7 with the possibility of movement and is controlled by the drive 8. The racks 7 are controlled by the drive 9 (Fig. 3) and rotate around the axes 10 and 11 (Fig. 3) installed on the base 1. A mechanism for preloading the tool roller is installed on the traverse 6 12 (figure 2, 5) to the workpiece 13. The mechanism of preloading the tool roller 12 (figure 5) includes a hydraulic cylinder 14 (figure 5), pivotally mounted on the axis 15, and on the other hand, on the axis 16 of the lever 17. Based on 1, a movable mechanism 18 (Figs. 1, 2, 3) with a flanging roller 19 (Figs. 1, 3, 4) is installed.

The device operates as follows.

The workpiece 13 is mounted on the mandrel 5 (Figs. 1, 2, 3) and the rotation motor 2 of the mandrel 5 is turned on. Using the drive 8 (Fig. 2), the tool roller 12 is brought together with the traverse 6. In one of the cavities of the hydraulic cylinder 14 (Fig. .5) supply liquid, the lever 17 is rotated together with the tool roller 12, providing the necessary deformation of the workpiece 13 (figure 2). In the second cavity of the hydraulic cylinder 14 (Fig. 5), there is gas under pressure, which, compressing, forms a gas spring. The drive 9 (FIGS. 3, 4) of turning the racks 7 is turned on, in the axes 10 and 11 (FIGS. 2, 3, 4), the workpiece 13 is rolled out. The drives 8 and 9 are controlled by the tool roller 12 along the mandrel 5. The tool roller 12 acts normal to the tangent at the point of impact on the workpiece 13 mounted on the mandrel 5. The constant force of the tool roller 12 on the workpiece 13 and the mandrel 5 is provided by the gas spring of the hydraulic cylinder 14. When changing the thickness of the workpiece 13 within the technological tolerances and with an increase in the thickness of the workpiece 13 nstrumentalny roller 12 moves by acting through lever 17 on the cylinder 14 compressing the gas therein, for small movements of the tool roll 12, the compression of gas does not lead to a pressure increase, i.e. the force with which roller acts tool 12 on the workpiece 13 is not changed. When the thickness of the workpiece 13 is changed within technological tolerances and when the thickness of the workpiece 13 is reduced, the gas cavity of the hydraulic cylinder 14 expands, which does not lead to a decrease in pressure, that is, the force with which the tool roller 12 acts on the workpiece 13 does not change. After the rolling process is completed, the drives 8 and 9 return to their original position, the fluid pressure in the hydraulic cylinder 14 is released. The movable mechanism 18 and the flanging roller 19 installed on the base 1 are brought in, the rotation motor 2 of the mandrel 5 with the workpiece 13 is turned on, the edges of the workpiece 13 are flanged. After the flanging is completed, the rotation motor 2 is turned off, the movable mechanism 18 with the flanging roller 19 is retracted, the finished product is removed from the mandrel 5.

The technical result consists in increasing the accuracy of the shape of the obtained products due to the constancy of the forces acting in the process of plastic deformation of the workpiece.

Claims (1)

A device for rolling out and flanging hollow products, comprising a movable mechanism with a flanging roller mounted on the base, a mandrel with a drive and racks with a traverse installed on them, as well as a tool roller with two independent drives that allow it to move along the mandrel, and a hydraulic cylinder mounted on the said traverse with a gas cavity creating a constant force of the tool roller on the workpiece, and one of the said independent tool roller drives is made with possible the axle control the traverse, and the other - turning the racks.

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