SU977088A1 - Mill for cross rolling of hollow shaped products - Google Patents

Description

(54) MILLING PROCESSING MILL FOR HOLLY PROFILE PRODUCTS

one

The invention relates to the processing of metals by pressure, in particular to the structures of mills for cross-helical rolling of high-precision thin-walled sections.

A mill for transverse rolling of hollow section products is known, comprising two working stands, between which a feed mechanism with two mandrels, left and right loading devices, two heating devices and two unloading devices 1 are installed with the possibility of reciprocating.

The layout of the mill equipment was not allowed to reduce the time for loading products, and only provided the imposition of a loading cycle in one working stand with a rolling cycle in another. And although the mill in question provided an increase in productivity, however, the reserve for reducing the proportion of time spent on auxiliary operations was not fully utilized by this mill design. A structural disadvantage of the loading devices of this mill is the complex movement of the loading lever with the prism (first turn of the lever, and then extension of the prism on the rolling axis). how

practice has shown that the time of the lever rotation is 6–7 s and the prism advance time is 3–4 s, i.e. the total loading time of the workpiece is on average 10 seconds, while the rolling time is 25-30 seconds. An increase in the speeds of rotation of the lever and the extension of the prism to the rolling axis did not give positive results, since this led to a failure of the mill due to the ejection of the blanks.

10 A cross-rolling mill of hollow section products is known, comprising a working stand mounted on a frame with a drive of its reciprocating movement along the rolling axis, a centering device, a product loading and unloading mechanism, a receiving table and a dispensing table 2.

A disadvantage of the known construction of a cross-rolling mill for hollow sectional products is that its design allows one to successfully automate

Claims (2)

20, the process of loading and unloading products does not fully utilize the possibility of reducing the time for recharging the mill, since the table moving in the transverse direction from the rolling axis is placed between the hydraulic cylinders of the drive for moving the working stand. This circumstance causes a significant amount of stroke of the table moving cylinders when installed at the rolling position, which is associated with unproductive loss of time and, consequently, reduces the productivity of the mill. Another disadvantage of the known construction of the cross-rolling mill for shaped products is that the layout of the loading and unloading devices is not rational, since the billets and rolled products are placed on the loading and unloading tables parallel to the rolling axis. This increases the size of the mill width, which leads to the unjustified use of overproductive productive plondadi. The purpose of the invention is to increase the productivity of the mill by combining the loading and unloading mechanisms into one unit. To achieve this goal, the cross-rolling mill of hollow sections, containing a working stand installed on the frame with its reciprocating movement along the rolling axis, a centering device, loading and unloading mechanisms, a receiving table and a discharge table, are equipped with comb-shaped ones in front of the working stand. prisms with a shaft, 1-pivotally mounted on the frame with the possibility of movement along its own axis, and the receiving table and the issuing table are located opposite to each other relative to the shaft axis. When this comb prisms are fixed at an angle to one another. FIG. 1 shows a cross-section mill of hollow shaped articles, plan view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is a view along arrow B in FIG. 2 in the initial position of the loading and unloading product; in fig. 4 - the same at the time of dosing the workpiece and receiving the rolled product; in fig. 5 - the same at the moment of transfer of the workpiece to the rolling axis, and the product to the unloading axis; in fig. 6 - the same at the time of transfer of the product to the issuing table. The cross-rolling mill of hollow sections consists of a common bed 1 along which the working stand 2 moves from the drives 3. On the bed 1 there is also a node 4 of the mandrel 5 and a drive 6 of rotation of the mandrel 5. Inside the mandrel 5 there is a puller 7 connected through the sub-nodule 8 with the rod 9 of the drive 10. On the other hand, from the working room 2 years on the base 1 are installed the pusher And blanks, the receiving table 12 and the table 13 of the issuance. Between the pusher 11 and the working stand 2 are placed the loading 14 and the unloading 15 devices. The loading 14 and unloading 15 devices are made in the form of comb prisms, fixed at an angle to one another and pivotally mounted on the shaft 16 provided for the vertical movement of the actuator 17. The loading 14, the unloading 15 devices can be rotated by the actuator 18. The device operates as follows. By turning on the drive 17, the comb prisms 14 and 15 are lifted and the workpiece 19 is removed by the loading prism 14 from the receiving table 12. Previously, the previously rolled workpiece 20 is placed in the unloading prism 15 by the puller 7 of the products. the shaft 16, the workpiece 19 is located along the rolling axis, after which the pusher 11 moves in the axial direction and is put on the mandrel 5. The pusher 11 simultaneously centers the mandrel 5. The rollers of the working stand 2 are reduced to the required The second dimension includes the drive 6 of rotation of the mandrel assembly 4 and the drive 3 moving along the guides of the frame 1 of the working stand 2. After rolling the product, the rolls of the working stand 2 are diluted, the drive 6 of rotation of the mandrel 5 turns off and turns on the drive 10, which with its rod 9 by means of a bearing node 8 and the puller 7 removes the product 20 on the discharge prism. Then the cycle repeats. The proposed cross-rolling mill of hollow sections as compared with the best samples of similar equipment allows drastically reducing (by 30) the time of auxiliary operations for loading and unloading blanks, which corresponds to an increase in mill productivity by 5-8%. This is achieved due to the special design of the loading and unloading unit. The device also makes it possible to reduce the necessary production areas, since loading and unloading tables are conveniently located and arranged in the mill, in which the workpieces are located perpendicular to the axis of rolling. The completion of the cross-rolling mill of hollow sections in the manner proposed above ensures an increase in mill productivity by 5–8%, reduces the required production area by 10–15 / o and improves the service of the mill during operation. Claims I. A cross-rolling mill of hollow sections containing a working stand installed on a frame with its reciprocating movement along the rolling axis, a centering device, mechanisms for loading and unloading products, a receiving table and a dispensing table, characterized in that increasing the mill's productivity, it is equipped with comb-shaped prisms fixed in front of the working stand with a shaft hinged on the frame that can be moved along its own axis, and the receiving table and the dispensing table olozheny opposite to each other relative to the shaft axis. 2. A mill according to claim 1, characterized in that the comb prisms are fixed at an angle to one another. Information sources, taken into account in the examination 1. USSR author's certificate number 363532, cl. B 21 B 19/00, 08.31.70. 2. USSR author's certificate No. 846014, cl. B 21 N 1/18, 10.25.79 (prototype). P (rig. 14 eight( (rig 5 In and city 6