RU2026765C1 - Method of making blanks of long-measuring tools with ring members - Google Patents

Abstract

FIELD: cold plastic metal working. SUBSTANCE: blank is first subjected to cold plastic deformation by means of rolling between the profiled rolls and then to the multipass cutting out. The expansion of an oval hole cut out in the blank into a ring of round or elliptical shape is exercised. This ring and rack and pinion are bent off, the longitudinal part of the blank is curved in the plane of this blank. After that the blank is subjected to the cold volumetric plastic deformation by means of stamping. EFFECT: enhanced utilization factor of the material. 3 cl, 7 dwg

Description

 The invention relates to the field of cold metal forming, in particular to methods of cold plastic deformation, and may find application in the manufacture of cutting and clamping tools in the medical and tool industry.

 Closest to the invention is a method for manufacturing workpieces of long tools with ring elements and with a variable geometric cross-sectional shape along the length along which the original sheet workpiece is subjected to cold plastic deformation by rolling between profiled rolls and then the workpiece is cut out of it.

 The disadvantage of this method is the low utilization of the material.

 The technical result to which the invention is directed is to increase the utilization of the material.

 The specified technical result is achieved due to the fact that by the method of manufacturing blanks of long tools with ring elements and with a variable geometric cross-sectional shape along the length along which the original sheet blank is subjected to cold plastic deformation by rolling between profiled rolls and then the blank is cut out of it, according to the invention the workpiece is cut down in several transitions and at these transitions receive a ring with an oval hole and a rack, distribute this ring with obtaining as a result of a circular go elliptical shape and simultaneously or sequentially bending it and the cremallera relative to the longitudinal part of the workpiece, and then the workpiece is subjected to cold volumetric plastic deformation by stamping.

 Before and after cold volumetric plastic deformation by stamping, the longitudinal part of the workpiece is subjected to bending in the plane of this workpiece.

 The workpiece is cut down in several transitions, at these transitions a ring with an oval hole and a cremallier is obtained, this ring is simultaneously distributed to obtain a round or elliptical shape as a result, it is bent also and the cremallier, the longitudinal part of the workpiece is bent in its plane, and then the workpiece is subjected to cold volume plastic deformation by stamping.

 Figure 1-6 shows a diagram of the transitions of cutting and cold plastic deformation of the cut blanks on the transitions; Fig.7 - surgical clamp, General view.

 The method is as follows.

 Take a metal sheet (not shown) of constant thickness corresponding to the maximum thickness of the part of the manufactured tool. Cut the sheet into strips of constant width. The obtained strips are cut into rectangular blanks and each of the blanks is subjected to cold plastic deformation by rolling between profiled rolls having a certain geometric shape before the cutting operation, or the resulting strip, without cutting into blanks, is subjected to cold plastic deformation by periodic rolling between profiled rolls. As a result of rolling, a billet is obtained (in the case that a strip is obtained after periodic rolling, it is cut into billets) of variable thickness with an increased length compared to the original one and subjected to it (billet) by multi-transition cutting. After cutting down at the first transition, a blank 1 is obtained (Fig. 1). The cutting surfaces in this case are surfaces 2, 3, 4. In the second transition (FIG. 2), the cutting surfaces are surfaces 5, 6. In the third transition (FIG. 3), the cutting surfaces will be surfaces 7, 8 and in the fourth transition (FIG. .4) - surfaces 9, 10. Considering that during rolling and subsequent cutting of the workpiece, internal residual stresses were created that reduce the plastic properties of the metal required during subsequent stamping operations, the workpiece after cutting is subjected to low-temperature annealing. After annealing according to the first embodiment, an oval hole cut out in a strip blank is dispensed (Fig. 4) into a round or elliptical ring (Fig. 5) with simultaneous or sequential unbending of this ring and the cremallera relative to the longitudinal part in a special bending die. The resulting blank of this shape is subjected to cold plastic deformation by stamping in order to obtain the final geometric shape. Moreover, before or after cold volumetric plastic deformation, the longitudinal part of the obtained preform is bent in the plane of this preform (Fig.6). According to the second variant, the longitudinal part of the billet is bent simultaneously with the distribution of an oval hole cut out in a strip billet into a ring of elliptical or circular shape and bending it and the rack relative to the longitudinal part. After that, the workpiece is subjected to cold volumetric plastic deformation by stamping in order to obtain the final geometric shape.

 An example of a specific implementation of the method.

 Take a metal sheet of constant thickness, in this particular case, 4.5 mm, corresponding to the maximum thickness of the surgical clamp half (Fig.7). Cut the sheet into strips of constant width equal to 13 mm. The strip is cut into rectangular initial blanks with a length of 160 mm. Each of the blanks is subjected to cold plastic deformation by rolling between profiled rolls having a certain geometric shape. As a result of rolling, a blank of variable thickness is obtained with an increased length compared to the original. If a metal strip is rolled between profiled rolls, then it is cut into billets. The resulting billet is subjected to sequential cutting down for four transitions in special dies. After cutting down at the first transition, the workpiece shown in Fig. 1 is obtained. In this case, the cutting surfaces are surfaces 2, 3, 4. In the second transition (FIG. 2), the cutting surfaces are surfaces 5, 6. In the third transition (FIG. 3), the cutting surfaces will be surfaces 7, 8, in the fourth transition (FIG. .4) - surfaces 9, 10. The blank after cutting is subjected to low-temperature annealing. Then, according to the first embodiment, an oval hole cut out in a strip billet is distributed into a round or elliptical ring with simultaneous or sequential unbending of the rack and unbending the entire annular part relative to the longitudinal part. From the workpiece of the geometric shape shown in figure 4, get the workpiece with the geometric shape shown in figure 5. The operation is carried out in a special bending stamp. The resulting preform is subjected to cold volumetric plastic deformation by stamping in a stamp of volumetric stamping to ensure the exact geometric shape of the workpiece half surgical clamp with accurate dimensions and high-quality surface finish stamping. Moreover, before or after cold volumetric plastic deformation, the preform (Fig. 5) is subjected to plastic bending in a bending stamp to obtain a curved longitudinal part of the clamp (Fig. 6). Next, machining is performed along the contour. According to the second variant, the distribution of an oval hole cut out in a strip billet into a round or elliptical ring, the bending of this ring and the cremallera, as well as the bending of the longitudinal part of the billet in the plane of this billet, is performed simultaneously before cold plastic deformation.

 The method allows to obtain high-precision parts of complex geometric shape with high-quality finish of stamping surfaces, high metal utilization, high labor productivity and low manufacturing costs. The method allows to improve the sanitary and hygienic working conditions of workers, environmentally friendly, creates the prerequisites for automation and mechanization of the technological process of manufacturing tools.

Claims (3)

 1. METHOD FOR MANUFACTURING BILLS OF LONG-DIMENSIONAL TOOLS WITH RING ELEMENTS and with a variable geometric cross-sectional shape along the length, in which the initial sheet billet is subjected to cold plastic deformation by rolling between profiled rolls and then the billet is cut down several times, characterized in that at these transitions, they receive a ring with an oval hole and a cremallera, they distribute this ring, resulting in a round or elliptical shape and one it is bent or sequentially bent over it and the rack relative to the longitudinal part of the workpiece, and then the workpiece is subjected to cold volumetric plastic deformation by stamping.  2. The method according to claim 1, characterized in that before or after cold volumetric plastic deformation by stamping, the longitudinal part of the workpiece is subjected to bending in the plane of this workpiece.  3. A method of manufacturing blanks of long instruments with ring elements and with a variable geometric cross-sectional shape along the length, in which the initial sheet blank is subjected to cold plastic deformation by rolling between profiled rolls and then a blank is cut from it, characterized in that the blank is cut in several transitions and at these transitions receive a ring with an oval hole and a cremallera, at the same time distribute this ring with a round or elliptical shape, bending it dissolved and the focusing ring, bend the longitudinal portion of the preform in its strip, and the preform is then subjected to cold plastic deformation volume by stamping.

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