A method of manufacturing billets long tools with ring elements

 

(57) Abstract:

Usage: in cold metal forming, particularly when the methods of cold plastic deformation, and can find application in the manufacture of cutting and crimping tools in medical and tool industry. Effect: increase the utilization of the material. The inventive preparation is subjected to cold plastic deformation by rolling between the profiled rollers, then mnogovershinnoe cutting, produce hand cut in the workpiece oval hole in the ring is circular or elliptical in shape, unbend this ring and knob and produce bending of the longitudinal side of the workpiece in the plane of the block, after which the workpiece is subjected to cold volumetric plastic deformation by punching. 2 C. p. 1 C.p. f-crystals. 7 Il.

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

Most near and variable geometric cross-sectional shape along the length, according to which source the sheet is subjected to cold plastic deformation by rolling between the profiled rolls and then cut down preset from it.

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

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

This technical result is achieved due to the fact that according to the method of manufacturing billets long tools with ring elements and variable geometric cross-sectional shape along the length on which the original sheet blank is subjected to cold plastic deformation by rolling between the profiled rolls and then cut down preset from it, according to the invention the workpiece is cut down for a few transitions, and these transitions have the ring with oval hole and knob, give this ring to make the round go elliptical and simultaneously or sequentially unbend it and knob relative to the longitudinal side of the workpiece, and then the workpiece is subjected to cold volumetric plastic deformeable lengthwise of the billet is subjected to bending in the plane of the block.

The chipped out a few transitions, these transitions have the ring with oval hole and knob, at the same time give this ring to receive a round or elliptical as a result, unbend it and knob, bend the longitudinal portion of the blank in its plane, and then the workpiece is subjected to cold volumetric plastic deformation by stamping.

In Fig.1-6 presents the scheme of transitions cutting and cold plastic deformation of the cut workpiece by the transitions of Fig.7 is a 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 developed tool. Cut the sheet into strips of constant width. The resulting strip is cut into rectangular blanks and each of the blanks before the cutting operation is subjected to cold plastic deformation by rolling between the profiled rollers having a specific geometric shape, or the received band, not cutting on the workpiece is subjected to cold plastic deformation by periodically rolling between profilecopy strip, cut it into shapes) of variable thickness with increased length compared to the original and put it (blank) mnogovershinnoe cutting. After logging on the first transition receive the blank 1 (Fig. 1). The cutting surfaces are surfaces 2, 3, 4. At the second transition (Fig.2) the cutting surfaces are surfaces 5, 6. When the third transition (Fig.3) cutting surfaces are surfaces 7, 8, and the fourth transition (Fig.4) - surfaces 9, 10. Given that when the rolling and subsequent cutting of the workpiece were created internal residual stresses, reducing plastic properties of metal required for subsequent stamping operations, the workpiece after cutting is subjected to low-temperature annealing. After annealing in the first embodiment produces hand carved in strip harvesting oval holes (Fig.4) in the ring is circular or elliptical in shape (Fig.5) with simultaneous or sequential fold this ring and cremallera relative to the longitudinal part in a special bending stamp. The obtained preparation of this form is subjected to cold plastic deformation by stamping in order to obtain the final geometric shape. Moreover, before or after the tee this billet (Fig.6). According to the second variant bending, longitudinal sections of the workpiece are performed simultaneously with hand cut in the strip harvesting oval hole in the ring is circular or elliptical in shape and fold it and cremallera relative to the longitudinal part. After this, the workpiece is subjected to cold volumetric plastic deformation by stamping in order to obtain the final geometric shape.

A specific example of implementation of the method.

Take the sheet metal of constant thickness, in this case 4.5 mm, the corresponding maximum thickness of half a surgical clamp (Fig.7). Cut the sheet into strips of constant width equal to 13 mm Strip cut into rectangular initial billet length 160 mm Each billet is subjected to cold plastic deformation by rolling between the profiled rollers having a specific geometric shape. In the rolling receive a workpiece of variable thickness with increased length compared to the original. If rolled between the profiled rollers metal strip, then cut into billets. The resulting billet is subjected to successive cutting four re the values of cut in this case is the surface 2, 3, 4. At the second transition (Fig.2) the cutting surfaces are surfaces 5, 6. When the third transition (Fig.3) cutting surfaces are surfaces 7, 8, the fourth transition (Fig.4) - surfaces 9, 10. The workpiece after cutting is subjected to low-temperature annealing. Then in the first embodiment produces hand carved in strip harvesting oval hole in the ring is circular or elliptical in shape with simultaneous or sequential fold cremallera and fold the entire annular part relative to the longitudinal part. Of the workpiece geometric shape shown in Fig.4, to receive the workpiece with the geometry depicted in Fig.5. The operation is carried out in a special bending stamp. The resulting billet is subjected to cold volumetric plastic deformation by forging the stamp forming processes, ensuring precise geometric shape of the workpiece halves surgical clamp with accurate dimensions and high quality surface finish stamping. Moreover, before or after cold volumetric plastic deformation of the workpiece (Fig.5) is subjected to plastic bending in a bending stamp for a curved longitudinal side of the clamp (Fig.6). Next make IU the aqueous holes in the ring is circular or elliptical in shape, the fold of this ring and cremallera, and bending the longitudinal side of the workpiece in the plane of this procurement are performed simultaneously and before the cold plastic deformation.

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

1. A METHOD of MANUFACTURING BILLETS LONG TOOLS WITH RING ELEMENTS and variable geometric cross-sectional shape along the length at which the original sheet blank is subjected to cold plastic deformation by rolling between the profiled rolls and then cut her a workpiece, wherein the workpiece is cut down for a few transitions, and these transitions have the ring with oval hole and knob, give it a ring which results in circular or elliptical in shape and ignoramous the workpiece cold volumetric plastic deformation by stamping.

2. The method according to p. 1, characterized in that before or after cold volumetric plastic deformation by forming a longitudinal portion of the workpiece is subjected to bending in the plane of the block.

3. A method of manufacturing billets long tools with ring elements and variable geometric cross-sectional shape along the length at which the original sheet blank is subjected to cold plastic deformation by rolling between the profiled rolls and then cut her a workpiece, wherein the workpiece is cut down for a few transitions, and these transitions have the ring with oval hole and knob, at the same time give this ring to obtain circular or elliptical in shape, unbend it and knob, bend the longitudinal portion of the blank in its ploskosti, and then the workpiece is subjected to cold volumetric plastic deformation by punching.

 

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