SU557884A1 - The method of cutting rolled to length and a stamp for its implementation - Google Patents

Description

one

The invention relates to metal cutting, in particular, to methods of finishing cutting of rolled metal, mainly bar for dimensional details.

Known methods for cutting rolled steel, mainly bar for measuring parts 1.

In this method, the bar is fed into the scissors until it stops and then pressed against the bottom HOJKy using a clamp. Then the upper knife is lowered and the bar is cut, which is previously pressed to the upper knife by a special device with a force proportional to the cutting force. The clamping rod to both knives is very significant and does not allow the material to flow in the axial direction.

This method of cutting metal provides a relatively high cutting quality, but does not provide high productivity, since cutting is performed only on one plane and, moreover, the interception and clamping of the bar with a particularly movable knife takes a lot of auxiliary time.

There is also known a method of cutting rolled products, including clamping the workpiece from two sides, local thinning of the workpiece in the area between the clamps and dividing it along the line of weakened section 2.

This cutting method also does not differ in high productivity.

The aim of the invention is to provide a method of fine cutting of rods into dimensional parts, providing higher performance, as well as a device implementing this method. This is achieved by localized thinning.

the blanks are made in close proximity to each of the clamps, and the separation is done by shifting a part of the blanks enclosed by a section with weakened sections. Such a way to be implemented

a stamp of a new construction containing a frame with a fixed knife fixed on it, a driving movable part with two cutting edges, an emphasis limiting the movement of the workpiece and a strung-off ejector of the workpiece 3.

The difference between the stamp that allows a new method to be implemented is that it is equipped with rooms and rooms located on either side of the movable part of the stamp at a distance of

less than the length of the part and driven from the movable part of the stamp by means of wedge mechanisms, the front one in the direction of rolling supply is provided with annular billet projections disposed at a distance of the part length from each other and at a distance two times the length of the part from the corresponding cutting edges of the base part of the stamp . FIG. 1 shows a scheme for cutting the workpiece; in fig. 2 is an end view of the workpiece during clamping and grooving; in fig. 3 - the scheme of clamping and cutting; in fig. 4 — bar cutting punch, front view; in fig. 5 - the same, - side view; in fig. 6 - dumper, side view; in fig. 7 - the same plan view; in fig. 8 is a front view of the manufactured part. The method of finishing cutting of rolled products, in particular rods, into dimensional parts includes clamping rod 1 (Fig. 1) in clamps 2 containing protrusions 3. Protrusions are pressed to the required depth into rod 1. In the proposed method, the clamps have two pairs of protrusions pressed into the rod simultaneously in two sections, at a distance of the workpiece length from each other. When an incision is made by indentation at the site of a weakened section, a local concentration of internal stresses is created, which increases the material's curvature in this section. Next, the bar moves to the next machining position (Fig. 3). Here it is clamped by clips 4 so that one clamp covers a part of the bar from the end to the notch, equal to the length of one blank, and the other part of the bar beyond the second notch. The bar is clamped with a force sufficient to prevent the metal from flowing in an axial direction. Thereafter, the bar is cut by the punch 5, which shifts the part of the bar between the clamps relative to the clamped parts. The increased material fragility in a weakened section ensures a clean cut surface. Practically cutting a rolled product, such as a bar, into dimensional workpieces using the method described above, can be done, for example, in the stamp shown in FIG. 4-7. The stamp contains the bottom plate 6, on which stands 7 and 8 are fastened, the lower halves 9 and 10 of the clamps, separated from the racks by plates 11, and the housing adjacent to the clamp 9. Between the housing 12 and the clamp 10 there is a gap for the passage of the punch equal to the size of the part. , and in the plate itself, a hole 13 of the same size is made in this place. On the uprights 7 and 8, the brackets 14 are fastened, into which the bases of the wedges 15 enter. The wedge is spring-loaded with springs 16, which with their second end abut against screws 17, providing the ability to adjust the degree of compression of the springs 16. The wedge 15 is equipped with limiters, which are pins 18 on the wedges x 15, running in the longitudinal holes of the brackets 14. On the axis 19 of the wedges 15, the rollers 20 are fastened. On either side of the lower halves 9 and 10 of the clips are springs 21, on which the upper halves of the 22 and 23 clips are fastened. And the upper and lower halves of the clamps are made according to the shape of the finished part. The upper half of the first clip 22 is further provided with protrusions 24, the lower half of the same clip has corresponding protrusions (not shown in the drawings) designed to loosen the bar section and create a concentrated voltage at the points where the bar is further cut. In addition, the upper half 22 contains shape-forming profiles 25, with which the figured deformations are transferred to the rod. Similar figures contains the upper half of the second clip 23. In the upper part of the clamps 22 and 23, axes 26 are fixed to the rollers 27, which interact with the wedges 15. In the rack 7 and the housing 12 there is a guide 28 which is bar-shaped and goes directly to the lower halves 9 and 10 of the clamps. In the rack 8 there is a protruding stop 29 in contact with the end of the bar lying in the clamp 10. The stop 29 is spring-loaded by a spring 30, the compression ratio of which is adjusted by a screw 31 and connected via a spring 30 to a brush 32 for issuing a signal to automate the workflow the number of parts, etc. On the bottom plate 6, the guide columns 33 and the impulse rod are also strengthened; the other ejector 34. The impulse ejector is mounted at the clamp 23 and contains a jaw 35 entering the housing 36, which is fixed on the bottom plate 6. On split On the shaft end of the rod 35 there is a roller 37 located on the axis 38. A rod 35 with a cylindrical bore through which the rod 39 is inserted, from the forked end of the rod the rod is bounded by a nut 40 screwed on it with a slip 41. From the other end the rod 39 projects from the rod and ends with the head 42 with the stop 43. The stop part of the head 42 is made in the shape of the rod being machined. A spring 44 is put on the rod 35, which at one end rests on the bifurcated part of the stem, and the other on the body 36. The second spring 45 is mounted on the part of the rod 39 protruding from the rod 35 and rests on the end of the rod and the stop 43. To the top plate 46 are attached bushing sleeves 47, which include guide columns 33, as well as shank 48 and punch 49. In the upper part of the punch 49, wedges 50 and 51 are reinforced, and in the lower knives 52. The upper plate 46 has a side brace 3, in the lower part which, on the axis 54, has a turning wedge 55, which interacts with the displaced and a roll breaker bracket 34. The turn of the wedge 55 down is limited by a stop 56 representing the protrusion on the rake 53. The wedge is spring-loaded spring 7, which at one end is attached to the pin in the wedge 55, and the other to the pin on the bracket 53. The whole die cycle i.e., the time for which the upper plate moves from the lowermost position to the uppermost one and back and proceeds in several stages. In the polishing of the stamp parts shown in FIG. 4 and 5, the cutting process is completed, the punch 49 has completely crossed the section of the bar and is in the lowest position. The part of the nrut under the knife cutter (punch), which is not held back after it has been cut, falls into the hole 13. The wedge 50 and 51, fixed on the punch 49 and interacting through the rollers 20 with the wedges 15, are separated with the lowest position of the upper plate wedge 15 to the farthest position from the punch 49. In this position, the wedge 15, through the rollers 27, presses on the clips 22 and 23 and the bar in the clips continues to be clamped. The wedge 55, fastened to the bracket 53, is also in the lowest position and the outer 57 is retracted to the stop 56. When the plate 46 moves upwards, the puaison n wedges 50 and 51 also rise. At the same time, a wedge 50 and 51 walks away from the rollers of the wedges 15, while those under pressure from the springs 16 rise upwards. As the wedges 15 move in the direction of the punch 49, their pressure on the rollers 27 and through them and clamps 22 and 23 ceases. Thus, as the nlits 46 move upward, the clips 22 and 23 rise, but due to the described wedge transmission, their speed is lower than that of the plate 46 and is designed so that the clips still hold the bar while the punch 49 is out of its cross section. This keeps the rod from being pressed along with the punch if it is sticking. At the same stage of the stamp operation, the manufactured part is removed by finding I1c in the clamp 23. The part from the clamp 23 is removed by the pulsed spring release device 34. The resetter works in the following manner. When the plate 46 moves upwards, a wedge 55 is fixed on the crown 53 53. When the roller 37 reaches, the wedge 55 rests on it, but since the stop 56 does not allow it to turn on the axis 54 and tilt down, the wedge 55 presses on the roller 37. Under the action of this force, the rod 35, compressing the spring 44. moves to the part that is in the clamp 23. Together with the rod 35, the rod 39, which is in niTOKe and spring-loaded spring 45, moves. After the head 42 is pressed into the part, the rod 35 , continuing to move forward, as a result of further raising the plate 46 begins to slump supper 45 (rod 39 remains at the same iepodvizhiym). At that moment, when the 22 bar 23 releases the bar, the ejector, thanks to the energized compressed spring 45, combs and pushes the part out of the clips 23 and 10. The spring 45 expands and pushes the rod 39 forward. The core of the head 42 strikes n throws out the item nz clamp. The movement of the rod is limited by the stop of the nut 40 with linch pin 41 into the rod 35. According to the pitch diagram of the stamp immediately after the part is dropped, the wedge 55 continues upwards and comes out of the interaction with the roller 37 and the spring 44 returns the rod 35 to its original position. The movement of the rod 35 back is limited by the uniration of the cutter 43 into the protrusions of the corus 36. Thus, the process of dropping a part over time is very short and does not require a large auxiliary time. Immediately after the stage described above, to fully depress the clamps, a new part of the bar should be fed into the die. The bar is fed when the plate 46 is moved from the half stroke to the extreme upper position and back to the half stroke to the lowest position. Bar feeding is done manually or by a special mechanism not shown in the drawings. When feeding, the bar moves forward as far as it will go. In doing so, he presses the protruding support 29 from the rack and sinks it. The stop 29 compresses the spring 30, the spring presses against the rod 32, the displacement of which can be used to synchronize the operation of the nodes of the line containing this chip. After feeding, the bar is clamped in the clamps. Clamping is as follows. When Itya 46 moves downward, the wedges 50 and 51, pass a free move, transfer the movement through the rollers 20 wedges m 15 and gradually squeeze them to the sides. The wedge 15, which is in constant contact with the rollers 27 at the clamps 22 and 23, is pressed against them as it moves, as a result of which the clamps, overcoming the resistance of the springs 21, lower and clamp the bar. At the same time, together with the plate 46, the punch 49 with the knives 52 moves downward. At the moment when the knives 52 reach the bar and the cutting process is started, the clamps 22 and 23 forcefully clamp the bar and press on it with a force that prevent metal flow in the axial direction and provide a preliminary notch in two sections with protrusions 24. At the same time, a wedge 55 goes down with the bracket 53. When moving past the ejector, the wedge, sliding off the roller 37, deflects upwards, turning around the axis 54. After the wedge a resetter roller will pass, returning spring 57 to its initial position. Upon further lowering of the plate 46, the punch completely crosses the bar, the shear and the part of the bar that is coming in relative to its clamped parts. This part of the bar falls into the hole 13. Then the tops of the slab rise and the work nickel is repeated. Thus, the proposed method of cutting rolled stock, such as a bar, ensures high productivity of this process, which is achieved through the use of shearing cutting, as well as the fact that the separation is carried out simultaneously in two sections. As a result, all elements of the stamp perform only a limited reciprocating movement, relatively high

speed of movement; simplicity of drive; automation of the process.

The use of a pulsed ejector, which instantly drops and nrmeylm at any pitch diagram, solves the difficult problem of removing a cut piece, unified into a fixed stop and bounded by clip elements, and also applies both manual and automatic material feed.

Thus, the proposed method and device provide high performance in the manufacture of parts.

In addition, due to the created weakened section with conceptual stresses formed by indentation, reliable clamping and bar feed to the stop provides high cut quality and high dimensional accuracy of the manufactured part.

Great effort is allowed to use them by imparting an appropriate configuration to obtain finished parts of complex shape, for example, with notches, grooves without further processing.

The proposed method, as well as the device, can be used for cutting and manufacturing parts of different configurations. To do this, it is enough just to give the appropriate shape to the clamps and the guide and put the clamps, knives and stop to the desired length.

Claims (3)

1. A method of cutting rolled products, for example, rods, into measured lengths, including clamping the workpiece from two sides, local thinning of the workpiece in the area between the clamps, and dividing it along the line of the weakened section, about tl and h, and so that in order to increase productivity and improvement in processing quality; local thinning of the workpiece is performed directly in front of the clamps, and separation is carried out by shifting the part of the workpiece that is enclosed between the weakened sections. 2. A stamp for carrying out the method of cutting rolled products, for example, rods, for measuring lengths according to claim I, comprising a station with a fixed knife fixed on it, a moving movable part with two cutting edges, a stop limiting the movement of the workpiece and a spring-loaded ejector of the workpieces, in that it is provided with clamps located on either side of the movable part of the die at a distance no less than the length of the part and irivodic from the movable part of the stamp by means of wedge mechanisms, with the front in the direction of rolling supply, the clamp is provided with annular billet projections located at a distance of the length of the part from each other and at a distance of two times the length of the part from the corresponding cutting edges parts shtampa. Sources of information taken into account at the examination: 1. Author's certificate of the USSR No. 219362, M. Cl.2 B 23 D 23/00, 1967. 2. USSR author's certificate No. 228480, M. Cl.2 B 23 D 23/00, 1967. 3. USSR author's certificate No. 428832, M. Cl.2 B 23 D 23/00, 1972. t I clL: i: iiil :: jz: uzn four. 7 / / / / I V ° 7; . ; ; 5 25 to 52} s 970 23 29 P 8 . 5J 514 f / v / J7 35 42 1