The method of operation of the equipment in welding workpieces

 

(57) Abstract:

The invention relates to the processing of metals by pressure, in particular to the settlement of the blanks on the press with two movable desks in the process of manufacturing allocating wheels. The objective of the method is to reduce the number of auxiliary operations on sedimentary press, as well as improving the accuracy of centering the workpiece relative to the punch. The method of operation of the equipment at upsetting the workpieces to the press with two movable tables in the manufacturing process of allocating wheels includes laying the piece on the first table and supply it in the working area prior to precipitation, the combination of pre-mounted workpiece with a calibration ring, and her draught of it, centering the calibration ring on the second table in front of the bulk of the workpiece by the punch, descaling, feed the calibration ring in the working area of the second table, the bulk of the workpiece by the punch in the calibration ring on the second table, lifting beam press with punch and moving the second table from the work area to remove the workpiece from the calibration ring. The combination of pre-mounted billet floating gauge ring exercise put oncol billet yoke raise, strike the punch, raise gauge ring with the workpiece on the second table with the simultaneous removal of scale and center it on the punch. 2 Il.

The invention relates to the processing of metals by pressure and can be used in ferrous metallurgy in the manufacture of solid-rolled wheels.

A known method of manufacturing billets stampanato wheels using equipment for precipitation, according to which, after precipitation in the calibration ring blank with the ring relative to the center of the desktop press, and then carry out the bulk metal punch (ed. St. N 852430, class B 21 1/28, B 21 K 1/32). The main disadvantage of this method is the low accuracy of centering of the punch relative to the workpiece, which leads to dimensional deviations of the elements of solid-rolled wheels.

As a prototype adopted a method of operation of the equipment at upsetting the workpieces to the press with two movable tables in the manufacturing process of solid-rolled wheels, which includes laying the piece on the first table and supply it in the working area prior to precipitation, the combination of pre-deposited billet floating gauge ring and her draught of it, the flow in the working area of the second table, the bulk of the workpiece by the punch in the calibration ring on the second table, lifting beam press with punch and moving the second table from the work area to remove the workpiece from the ring (Bibik, A. and others, the Production of railway wheels. M. metallurgy, 1982, S. 73-75). From all 19 operations on sedimentary press manufacturing operations make up only 15% of the Remaining support. This reduces the productivity of the press makes its narrow link in the entire process chain equipment forging-rolling line wheel shop. The main disadvantage is idle desktop when moving empty calibration ring from the second table first before upsetting the billet in a floating ring on the first table, and then transfer the ring with the workpiece back to the second table for the pickup. Also increases the cycle time press the necessity of removing scale from the workpiece and tube plates after precipitation in the ring. Another significant disadvantage is indirect centering of the punch relative to the workpiece before rectification: the calibration ring with the workpiece relative to the center of the second table, table center deadlocks with respect to an axis of the press and the punch also using Tupi and and as a consequence, leads to such defects as the thickness of the rim and raznesennost hub.

The objective of the invention is to reduce the number of auxiliary operations on sedimentary press with two desks, as well as improving the accuracy of centering of the punch relative to the workpiece before rectification.

The task is solved in that in the method of operation of the equipment at upsetting to press with two movable tables in the manufacturing process of solid-rolled wheels, including laying the piece on the first table and supply it in the working area prior to precipitation, the combination of pre-deposited billet floating gauge ring and her draught of it, centering the calibration ring on the second table in front of the bulk of the workpiece by the punch, descaling, feed the calibration ring in the working area of the second table, the bulk of the workpiece by the punch in kalibrovochnom ring on the second table, lifting beam press with punch and moving the second table from the work area to remove the workpiece from the calibration ring, the combination of pre-mounted billet floating gauge ring carried by its gripping and lifting bar press, out punch, raise gauge ring with the workpiece on the second table with the simultaneous removal of scale and center it on the punch.

The proposed method differs from the known for the following features:

the location of the calibration ring at upsetting him workpiece;

the order of combining the calibration ring and pre-deposited preform before upsetting her in the ring;

the order of movement of the bar, punch, gauge rings, centering gauge rings before the bulk of the workpiece.

In Fig. 1 presents a scheme of successive technological and auxiliary operations in welding wheel blanks on the proposed method, Fig. 2 the same according to the method of operation of the equipment at upsetting the workpieces to the press with two desks.

In Fig. 1 and 2 taken designations: 1 source procurement, 2 first Desk, 3 axle press, 4 traverse the press with the upper sedimentary stove, 5 gripping pliers, 6 gauge ring, 7 second Desk, 8 - sliding mounting plate, 9 stub left, 10 impasse right, 11 blank after the preliminary precipitation, 12 punch for the pickup of the workpiece 13 - centering element (seat in sny mechanism for removing blanks from the second table.

The method consists in the following. Heated to the temperature of deformation of the workpiece 1 is served on the nominated from the press first table 2 (Ref. 1, figs.1). Under pressure on the axis 3 in the upper position is clamp plate 4 with the gripping tongs 5, the calibration ring 6 is placed on the second table 7. Both table mounted on a sliding plate 8, which is fixed by the stub 9. It should be noted that the first and second tables are structurally executed the same and is equipped with interchangeable flat tube plates. The calibration ring 6 is freely laid on the second table 7 and is floating. The first table 2 with the original workpiece 1 is served under the press by moving the sliding plate 8 to its emphasis in the deadlock 10 (Ref.2). Movement of the bar 4 down carry out a preliminary draft of the workpiece smooth plates for breaking scale on the side (POS.3). Then besieged the workpiece 11 capture 5 ticks and raise above the first table 2 (Ref.4), then under the press serves the second table 7 with calibration ring 6 (Ref.5). After laying the workpiece 11 on the second table 7 in the calibration ring 6 perform the final draft of the workpiece in the floating ring 6 until filling is complete the metal (Ref. 6). In the end what rootelem 13 (established on the Foundation) center gauge ring 4 with the workpiece relative to the plunger 12. This direct alignment gauge rings with the workpiece by introducing a movable conical stem tapered undercut on the calibration ring provides highly accurate alignment of the punch and the workpiece, which guarantees the absence of acceptance of the deviations of the varying wall thickness of the hub and the rim thickness variation in the finished wheel. Simultaneously with the centering, i.e., when raised above the table of the calibration ring, billet and tube plates air blow out the secondary scale (POS.7). Further on the second table are vacuumed metal plug (POS. 8), the rise of the crosshead and plunger in the upper position, the laying of the original piece on the first table (POS. 9). The cycle then repeats the first table with the original workpiece served under the press, with the second table is removed (from the calibration ring) of the workpiece after the pickup, from the press take a punch. In further preparation transfer on broaching press for punching holes on the forming press to form the hub and a portion of the drive wheel on the mill roll wheel diameter and on the last unit to calibrate the wheel on all elements.

Using the proposed method of operation of the equipment at upsetting the billet both the SSA to 27 C) and improving the accuracy of the pickup billet 1.5 times (reduce scrap wheels and repair grinding 10%).

Example. In the process of manufacture of railway wheels 957 mm under conditions of wheel shop Nizhny Tagil metallurgical plant used sedimentary press with a force of 3000 tons with two desks, mounted on a single slide plate. The original billet height of 300 and 500 mm in diameter were placed on brought forward from beneath the press of the first table, and then submit it under pressure until it stops moving plate in a deadlock. The table with the workpiece was mounted on the axis of sedimentary press, movement of the bar down carried out a preliminary draft of the flat plates to a height of 200 mm and a diameter of 640 mm After this, the workpiece pneumatically captured by the convex side surface of ticks and raised above the first table to a height of 250 mm, and under the press filed a second table with a calibration ring, the height of 125 mm and an inner diameter of 820 mm, loosely laid flat on the bottom tube plate.

The workpiece was placed on the table in the ring, mites is centered about the axis of Centrovital with an accuracy of 20 mm and only after that were two systems of flat plates. When this calibration floating ring has shifted from the axis of Centrovital 15 mm. Traverse the upper sediment is offered the ring blank is raised below the table level to a height of 85 mm, aligning it relative to the punch, which was also filed on the axis of the press. In this position, the ring was made sduw air secondary scale with billet and tube plates. Misalignment of the punch and the workpiece was 1.5 mm, which is quite acceptable. The calibration ring with the workpiece down to the second table and the course traverses down carried out the rectification of the middle part of the workpiece to a depth of 25 mm, and then raised traverse in the upper position, the punch out of the press, and on the first table was placed next to the original piece. The first table filed under press to lock the sliding plate to the right dead end, the crane was removed from the second table of the calibration ring blank after the pickup and the cycle of press operation was repeated. The total time of the cycle of operations on the press 26 S. In further preparation was sewn on press 500 ie was formed on the press 7000 ie rolled on the mill and grooved on the press 3000 ie Received wheel had stable dimensions (raznesennost wheel does not exceed 1.5 mm in valid 4 mm, the thickness of the rim 1.0 mm against valid 2 mm).

The method of operation of the equipment at upsetting the workpieces to the press with two movable tables in the manufacturing process of rolled kewanee pre-mounted billet floating gauge ring and her draught of it, centering calibration ring on the second table in front of the bulk of the workpiece by the punch, descaling, feed the calibration ring in the working area of the second table, the bulk of the workpiece by the punch in the calibration ring on the second table, lifting beam press with punch and moving the second table from the work area to remove the workpiece from the calibration ring, characterized in that the combination of pre-mounted billet floating gauge ring carried by its gripping and lifting bar press, subsidence in the calibration ring is conducted on the second table, and before the bulk of the workpiece traverse lift, punch down, raise gauge ring with the workpiece on the second table with the simultaneous removal of scale and center it on the punch.

 

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FIELD: instrument engineering.

SUBSTANCE: according to the method the blank of hanger is made taking direction of rolled stock into account. Then blank is subject to thermal processing, both sides of blank are cleared from material and hanger is formed by means of double-sided shaped embossing. According to the first variant of the method, blank is subject to heat-cyclical processing prior to double-sided embossing. According to the second variant, double-sided shaped embossing is made in two steps and heat-cyclical processing is performed between those two steps.

EFFECT: prolonged life of hanger; increased service life of press tool.

2 dwg, 2 ex

FIELD: plastic working of metals, possibly in forging shops of metallurgical and machine engineering plants for manufacturing automobile wheels and similar products.

SUBSTANCE: method comprises steps of preparing initial blank; forming of it intermediate semi-finished product in the form of cup having shaped bottom, wall and in zone of transition of wall to bottom - thickened portion defined at inner side of cup by surface of revolution, by annular protrusion on outer end of bottom and by flange on end of wall; making central protrusion on inner end of bottom; forming flange on wall by applying axial effort to its end for increasing thickness of wall having constant diametrical size at inner side; then finally shaping blank due to expanding annular protrusion on bottom of cup for forming other flange. Blank is finally shaped during two stages. At first stage height of central protrusion of bottom is increased due to radial motion of bottom material from its center and simultaneously thickness of said protrusion and diametrical size of bottom with flange are decreased, part of wall adjoined to bottom is thickened. At second stage sleeve is calibrated from inside for achieving final diametrical size of its cavity. Then bushings are subjected to heat treatment and mechanical working.

EFFECT: enhanced strength characteristics of reduced-cost wheels.

3 cl, 3 dwg, 2 ex

FIELD: plastic working of metals, possibly in forging shops of metallurgical and machine engineering plants for making motor vehicle wheels and similar articles.

SUBSTANCE: method comprises steps of preparing initial blank; then forming intermediate semi-finished product in the form of cup having shaped bottom, wall, thickened portion in zone of wall-bottom transition restricted at inner side of cup by surface of revolution, by annular protrusion on outer end of bottom and by flange on end of wall; forming flange of wall due to applying axial effort to its end at increasing wall thickness while keeping stable diametrical dimensions at inner side of wall; then finally shaping bushing due to expanding wall until final diametrical dimensions of its flange and deforming annular protrusion on cup bottom to other flange; restricting the last in peripheral zone of its outer end by cone surface of revolution having apex in axis of bushing; selecting conicity angle of said surface in predetermined range; realizing heat treatment of formed bushings.

EFFECT: enhanced strength characteristics of wheels in condition of cyclic loading during exploitation.

2 dwg, 1 ex

FIELD: plastic working of metals, possibly in forging shops of metallurgical and machine engineering plants for making motor vehicle wheels and similar products.

SUBSTANCE: method comprises steps of preparing initial blank; forming intermediate semi-finished product in the form of cup with flange on end of wall and with annular protrusion on outer end of bottom; forming flange of wall due to increasing thickness of wall near its end at constant diametrical dimensions at inner side of wall; then finally shaping blank with two beads; forming ne bead due to deforming flange of cup wall at expanding wall from inside at least in zone of its end; forming other bead due to expanding annular protrusion to cone at conicity angle of inner surface of protrusion in end zone exceeding conicity angle in zone adjacent to cup bottom; determining geometry sizes of semi-finished product and final blank according to given relations; then performing heat treatment and mechanical working of products.

EFFECT: significantly decreased cost of small lots of products.

2 dwg, 1 ex

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