SU1222376A1 - Apparatus for expansion by rolling of axially symmetric articles - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to the manufacture of rolling products having the form of rotation bodies.

The purpose of the invention is to expand the technological capabilities, increase productivity and increase the utilization rate of the metal.

The drawing shows a diagram of the device.

The device contains a matrix 1, mounted in the housing 2 and secured with the cover 3. In the same case, the mandrel 4 is installed. The screw 5 on which the spring 6 is fitted is intended to limit the front axial limit movement of the mandrel 4.

An ejector 7 fixed on the cylinder rod of the machine extrusion (not shown) is placed in the gap between the die 1 and the mandrel 4. The rolling roll 9 is intended for rolling the workpiece 8 placed between the mandrel 4 and the die i with an abutment into the ejector 7. mounted on the pinch (not shown), mounted in the housing 10, which is placed on the movable head of the machine 11.

The housing 2 is fixed to the spindle 12 of the face of the machine tool (not shown). The matrix 1 is fixed in the housing 2 rigidly or with the possibility of axial movement limited by stops.

The working surface of the matrix 1 corresponds to the shape of the part of the outer surface of the rolled billet 8, which is in contact with the matrix during the rolling process. The matrix i limits the deformation of the part of the workpiece 8 in the tangential and radial direction.

The axial movement of the mandrel 4 to the initial working position is provided by a spring 6 or a transmitting device, for example a hydraulic cylinder or a pneumatic cylinder. The movement of the mandrel 4 in the process of rolling the workpiece 8 is achieved either by using the same devices or by using the roll roll 9.

The working surface of the mandrel 4 corresponds to the shape of the inner surface of the rolled billet 8. The configuration of the inner and outer surfaces of the ejector 7 repeats, respectively, the configuration of the working surfaces of the mandrel 4 and the die 1.

Roller roll 9 overlaps in the diametral plane the end of the mandrel 4. The minimum overlap of the mandrel 4 by the roll roll 9 is determined by the strength characteristics of the materials of which the die and mandrel are made, and the maximum overlap is limited by the radius of the end of the mandrel.

The device works as follows.

The rolling roller 9 is used to roll out the workpiece 8 installed between the mat

0

with

0 5

The staple 4 and the mandrel 4 all the way to the ejector 7. To stabilize the beginning of the rolling process of the mandrel 4 is held in the extreme forward position by the spring 6, which simultaneously presses the mandrel 4 against the rolling roll 9 at the initial stage of rolling to prevent the formation of a radial hammer.

As the flange of the workpiece 8 forms during the process of rolling, the rolling roll 9 is displaced axially in the direction of the spindle 12, while the rolling roller 9 is in constant contact with the mandrel 4, which moves in the same direction at a speed not exceeding the speed of movement roll 9. After completion of the rolling process, the movable head 11 with the roll roll 9 is retracted from the roll blank 8.

By moving the cylinder outwardly with the ejector 7, the rolled billet 8 is pressed first from the matrix 1, and at this time the mandrel 4 moves with the billet 8 at the same speed. After pressing out the blank 8 from the matrix i, the mandrel 4 is fixed in the extreme forward position with the help of screw 5 and further P1IM of the ejector 7, the blank 8 is pressed from the mandrel 4. Accelerated idle displacement of the ejector 7 to its initial position is carried out by the extrusion cylinder stem.

The setup of the device for the next size with equal inner and outer xT. The dimensions of the original billet is carried out as follows.

The outer diameter of the flange of the rolled part is adjusted by moving the body 10 with the roller 9 along the movable head 11. The height of the workpiece is adjusted by moving in the axial direction the ejector 7 and the mandrel 4. The position of the mandrel is fixed by the screw 5.

The matrix I can be fixed rigidly (i.p. 1) or with the possibility of axial movement, in which case the movement of the matrix I is limited, for example, by the case and the cover. The roll 9 can be installed with respect to the axis of the part at an angle of 90-180 ° and have a different shape, for example conical or cylindrical. Depending on the machine design, the rotation drive may be on the spindle of the face or movable head.

The proposed device will be tested when rolling out parts with an outer copper flange for electrovacuum devices.

Parts are made from billet billets with an outer 135, inner 100 diameters and a height of 36.5 mm. Parts rolling is carried out on the MRB-35 machine by a cylindrical roller, installed so that its axis of rotation is at an angle of 90 ° relative to the axis of rotation of the workpiece, and on a special SBMZ 119000 machine with a tapered roller with an axis of rotation at an angle of 170 ° to blanks.

Rings 26 mm high are manufactured with a flange having an outer diameter of 180 and a height of 6 mm.

After the equipment has been rebuilt (reinstalled the roll roll and ejector), ring parts with a height of 14.5 mm are made with a flange having an outer diameter of 220 and a height of 6 mm.

The diametral dimensions of the sub-turret part of the parts of both sizes are the same and are respectively 135 and 100 mm.

The adjustment time of the equipment from one size to another is 10-15 minutes, which is on average 3 times less than the time required to replace the roll roll and mandrel.

When rolling out the parts on the MRB-35 machine, the deformation force is 25 tons for parts with an outer diameter of 180 mm flange, for parts with an external diameter of 220 mm - 32 tons, the rotation speed of the roll roller is 40 rpm. When rolling parts on a SBMZ 119000 machine, the deformation force in both cases does not exceed 25 ts, the rotational speed of the workpiece is 50 rpm. The pressing force of the workpiece is halved and does not exceed 5 tons.

The time of pressing out and returning the ejector to the initial position is reduced by about 3.5 times compared to the same indicators for the commonly used tool and does not exceed 10 s for one part. Each machine is made of 200 parts of each size.

By improving the surface quality and increasing the dimensional accuracy of the rolled blanks, the allowances for subsequent machining from 1.5–2 mm per side to 0.5 mm are reduced, which makes it possible to increase the material utilization rate by an average of 5%. In addition, by reducing the allowances, improving the quality of the flange surface, as well as eliminating the axial flow, the labor intensity of subsequent cutting operations is reduced.

The use of the invention improves productivity by reducing tool strokes and eliminating the time spent on installation and removal of a special tool for pressing out the rolled stock by 10-15%. In addition, it allows you to expand the technological capabilities of the tool by manufacturing parts of different sizes on the same tool, as well as increasing the metal utilization rate by an average of 5% due to the improved quality of parts and the maximum approximation of the sizes of rolled blanks to the size of the finished part.

Other advantages of the invention include the unification of an expensive and demanding tool: dies, mandrels and rolls according to the standard sizes of the blanks. This reduces the cost of making a responsible and expensive roll tool.

The use of the device according to the invention makes it possible to reduce the forces arising during rolling, thereby increasing the durability of the rolling tool and, consequently, reducing the metal consumption and the cost of the rolling tool.

Claims (1)

DEVICE FOR LAYOUT AXISYMMETRIC PRODUCTS, containing a matrix mounted on one spindle, a mandrel, a roll, mounted on another spindle at an angle 90-180 ° to the axis of rotation of the workpiece, characterized in that, in order to expand technological capabilities, increase productivity and increase the utilization of metal, it is equipped with an ejector installed between the matrix and the mandrel with the possibility of axial adjustment relative to the axis of rotation of the matrix, the mandrel is installed with the possibility of axial movement in the process of rolling and pressing out the workpiece, and the rolling roll - with the possibility of radial movement relative to the axis of rotation of the mandrel and along toyannogo contact with the end face of the mandrel during rolling. (Oh yu yu FD <1