ROLLED WAVE MOLD FOR E USE? A MACHINE. ROLLING DESCRIPTION OF THE INVENTION The present invention relates generally to mold fingers for use in a corrugation apparatus. More particularly, the invention relates to a corrugation mold for use in a corrugation apparatus comprising a plurality of circumferentially spaced adjacent mold fingers, each of the mold fingers having an internally shaped surface and a cam surface that confronts in opposite manner to engage a cam of the corrugation apparatus. Specifically, the invention relates to a corrugation mold wherein the mold fingers have internal forming surfaces including a groove formed therein oriented along the longitudinal axis, wherein the groove has a length substantially equal to the length of the groove. the internal shaped surface. Waving machines for corrugating couplers on the end of hoses, such as couplings of one or two pieces of rod / bushing for hydraulic hose, are well known. It is well known in the production of hose assemblies to permanently secure a metal hose coupling at the end of a hose by crimping a bushing around a hose to cause the hose to be held firmly between the coupling sleeve and a coupler placed inside the hose. coupling The corrugated mold reduces the bushing in diameter to ensure the coupling to the end of the hose. The corrugation mold is typically constructed of a plurality of circumferentially spaced apart mold fingers. The corrugation mold typically has an internal surface that is substantially cylindrical and a cam surface facing in an opposite manner sized to engage a cam of the corrugation apparatus. The mold fingers are spaced from each other in an expanded mode to thereby allow the hose coupling which will be crimped to be placed in the center of the corrugation mold. The fingers of the mold are then operated, typically by a hydraulic ram of the corrugation machine, in the direction of the ferrule to be corrugated. This causes simultaneous radial inward movement of the fingers of the mold and a contraction of the corrugation mold. With the hose coupling bushing positioned within the center of the corrugation mold, radially inward deformation is performed to ensure coupling on the end of the hose. Wavy molds are typically constructed with eight mold fingers. The radial deformation caused by the eight-finger corrugation mold results in a deformation of eight segments coupled in the collar / bushing of the coupling. After undulating, the coupling sleeve has eight notches and eight protrusions. The eight protrusions are created from the material that flows between the eight fingers of the mold during the corrugation. After undulating with eight mold fingers, the internal diameter (ID) of the corrugated cap resembles an octagon. The apices of the octagonal conformation form potential filtration paths in the hose coupling. A hose coupling of the prior art,
U.S. Patent No. 5,267,758 assigned to Shah, et al., Solves the problem of potential filtration paths in the apices of the octagonal ID of the ferrule. The United States Patent NO. 5,267,758 discloses a cap containing a C-shaped insert. undulating in a hose, the C-shaped insert is bent to a substantially round conformation in contrast to the polygonal conformation. The C-shaped insert solves the potential filter path problem but is not used in all bushing product lines, due to the expensive added insert of the C-shaped insert. Hose bushes are still used that do not use the insert in C and thus still have the problem of potential filtration paths in the apices of the octagonal ID of the bushing. Although the insert in C of the Patent of the United States No. 5, 267,758 solves the problem of potential filtration paths as described above, there are other problems after undulating the cap containing the insert in the form of C. These other problems also exist with conventional ferrules that do not contain the insert in the form of C. When a ferrule is undulated with a corrugation mold constructed of eight mold fingers, eight protrusions of excess material are created which flow between the eight mold fingers during the corrugation. Due to the flow of material, there is a tendency for these protrusions not to be uniform and have sharp, unsafe edges. In many applications, the bushing of the same size is corrugated in a hose with the internal diameter of the same size (ID) but has a large range of external diameters (OD). For example, the bushing of the same size can be waved in 3/8 in. Hose DI with hose OD in the range of 0.62 to 0.80 in. The recommended wavy OD of a wavy bushing in ID of 3/8 in, 0.74 in of OD of hose is 0.89 in, while the recommended wavy OD of the bushing of the same size waved in 3/8 in of DI, 0.625 in in OF the hose is 0.81 in. The problems of projections mentioned above with non-uniform or pointed edges are more prominent in the network of the two examples. This is because when the wavy of the standard bushing to a smaller wavy ED, more metal must flow between the fingers of the mold than when rippling to a larger wavy De. When rippling the standard bushing to a smaller wavy ED, the eight-finger wavy may tend to be non-uniform or coarse due to insufficient pressure around the bushing during the corrugation process. As a result, the extra metal flow between the fingers of the mold can form non-uniform and pointed protrusions in the corrugated cap. The need remains, particularly in the area of sleeve machines for radially crimping the sleeve of a hose coupling at the end of a hose, by a corrugation method which solves the problems of uneven, pointed protrusions in a corrugated sleeve and trajectories of potential filtration in a cap that does not have an insert in C. Therefore, the present invention has as an object the provision of a mold finger used in a corrugation mold to corrugate a cap, which solves the problem of pointed projections, not uniform in the wavy sleeve. Another object of the present invention is the provision of a corrugated mold, formed of a plurality of mold fingers, used in a corrugation apparatus for corrugation of a sleeve, which provides improved roundness over the corrugation molds of the prior art. Another object of the present invention is the provision of a corrugation apparatus used to corrugate a ferrule, which solves the problem of pointy, non-uniform protrusions in the corrugated ferrule. Another object of the present invention is the provision of a method for corrugating which provides a rounder, more uniform waviness than the waviness methods of the prior art. Another object of the present invention is the provision of a corrugated sleeve having level projections, uniform and rounder than the corrugated sleeves of the prior art. To achieve the aforementioned and other objects and in accordance with the purpose of the present invention, as exemplified and broadly described herein, a mold finger, a corrugation mold, an apparatus for corrugation, a method for corrugation and a sleeve wavy thereof is provided. The invention relates to a mold finger and a corrugation mold comprising a plurality of circumferentially spaced mold fingers used in a corrugation apparatus, wherein the mold finger has an internal forming surface and a confronting cam surface in opposite form, and wherein at least one finger of the mold having the internal forming surface includes a groove formed therein oriented along the longitudinal axis. The invention also relates to a corrugation apparatus using inventive mold fingers, a method for crimping a sleeve with inventive mold fingers and a crimped sleeve by the inventive method. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification and in which similar numbers designate similar parts, illustrate preferred embodiments of the present invention and together with the description, serve to explain the principles of the invention. In the drawings: Figure 1 is a top plan view of a wafer mold of the prior art; Figure 2 is a top plan view of the corrugation apparatus exemplifying the invention without a sleeve in place; Figure 3 is an elongated top plan view of the corrugation apparatus exemplifying the invention, showing a crimping sleeve; Figure 4 is a top view of a mold finger exemplifying the invention; Figure 5 is a side view of a mold finger exemplifying the invention; Figure 6 is a perspective view of the mold finger of Figures 4 and 5; Figure 7 is a perspective view of a corrugation apparatus exemplifying the invention; Figure 8 is a sectional view of the corrugation apparatus of Figure 8, showing a sleeve to be corrugated; Figure 9 is a view of the assembled hose assembly after the sleeve has been crimped. With reference to Figure 1, a waving apparatus of the prior art is shown. Figure 1 shows a top plan view of a prior art corrugation apparatus generally indicated at 10. Figure 1 shows a corrugation mold 15, which comprises a plurality of circumferentially spaced prior art mold fingers 8, with an internally shaped surface 17, disposed radially about a longitudinal axis 22. A corrugated sleeve in the prior art corrugation apparatus 10 of Figure 1 can form uneven and pointed ridges on the corrugated sleeve, the disadvantages of which are solved by the present invention. With reference to Figures 2 and 3, there is shown in accordance with the present invention a corrugation mold 13 in a corrugation apparatus generally indicated at 11. The corrugation mold 13 is comprised of a plurality of circumferentially spaced mold fingers 18, with an inner forming surface 19, disposed radially about a longitudinal axis 22. The internal forming surface 19 includes a groove 21 formed therein, oriented along the longitudinal axis 22. As shown in Figures 2 and 3 , the circumferentially spaced apart mold fingers 18 are spaced apart. Figure 2 shows a corrugation mold according to the present invention prior to corrugation of a sleeve around a hose. Figure 3 shows the same corrugation mold during the corrugation process. In a prior art corrugating apparatus 10, as shown in Figure 1, there are eight spaces between the eight mold fingers 8 so that the metal of the sleeve flows during the corrugation process. In the corrugation apparatus 11 of the present invention, as seen in Figures 2 and 3, there are eight spaces between the eight fingers of the mold 18 as well as eight grooves 21 in the internal forming surface 19 of the fingers of the mold 18 so that the sleeve metal flows during the corrugation process. Figure 3 shows the metal flowing in these sixteen areas during the corrugation process. Although Figures 2 and 3 show a corrugation mold including eight mold fingers having an inner forming surface including a groove which is substantially cylindrical, the present invention is not limited to the use of eight mold fingers (e.g. , nine, twelve or sixteen fingers of mold are also contemplated) or to a substantially cylindrical groove; The present invention can be used in a corrugation mold with any number of slot configurations. Figures 4-6 show a more detailed view of the mold finger 18 of the present invention. As seen in the preferred embodiment of Figures 4-6, the mold finger 18 has an internally shaped surface 19 that includes a groove 21 formed therein oriented along the longitudinal axis 22, as shown in the Figures. 2 and 3. As seen in Figure 6, the slot 21 divides the mold finger 18 into two substantially equal portions 27L and 27R, each of which has a surface area. In a preferred embodiment, the mold finger 18 has a groove 21 with a width of about 5% to about 50% of the internal forming surface 19. The groove 21 must also have a depth of sufficient size to accommodate metal displaced from a corrugated sleeve. The depth of the groove will vary depending on the size of the sleeve to be crimped. An external diameter of final corrugation (DE) is measured with calibrators placed between the projections of the corrugated sleeve. In a more preferred embodiment, when a sleeve is corrugated to a final wavy diameter of 16.79 mm, the radius of the slot 21 located in the finger of the mold is 1 mm. In another more preferred embodiment, when a sleeve is crimped to a final wavy diameter of 19.89 mm, the radius of the slot 21 located in the mold finger is 1.25 mm. Other slot configurations that meet the requirements of the specific request are also covered. Figure 5 shows a side view of an embodiment of the inventive mold finger 18. The depth of the groove 21 can be observed in the shaded Figure 5, located on the internal forming surface 19 of the mold finger 18. It is also observed in Figure 5, the opposing facing cam surface 25, which is sized to engage a cam of a corrugation apparatus. The groove of inventive mold finger 18 can be formed by either grinding or milling a groove as a final machining operation before the fingers of the mold harden in the machining process. It is provided that any other method of forming a groove 21 in the internal forming surface 19 of the mold finger 18 can be used. The total perspective view of the corrugation apparatus, generally indicated at 40, with a hose coupling ready to be corrugated as seen in Figure 7. The corrugation apparatus 40 is interconnected through four corner loop rods 14 to a fixed cam 17. This cam 17 engages the opposite confronting cam surface 25 of the mold finger 18, as seen in Figure 5. A plurality of mold fingers 18 forming the corrugation mold can be observed in Figure 7, and slide-mounted within the corresponding traces 24 of the mold cone 20 for radially inward movement towards the longitudinal axis 22 of the corrugation apparatus 40. The cone of the mold 20 is generally cylindrical in shape and includes a base portion 26 which engages a piston shown in shadows at 28. The piston forms a part of a hydraulic ram 30 integral with the cylinder base 12. The ram 30 and the piston 28 are operable to moving the cone of the mold 20 and the corrugating mold axially upwards to the position shown in Figure 8 by a conventional hydraulic system, generally indicated at 36, including the pump 38, hydraulic lines 40, and hydraulic fluid. The cone of the mold is retractable with springs (not shown) from the wavy position of Figure 8 to the resting, resting position of Figure 7. In the rest position of Figure 7, a rod 66 of a coupling of hose sits on the platform 52. To move from the loading position, of the scanning of Figure 7 to the operational position of Figure 8, the pump 38 is activated and the ram 30 is operated in such a way that the piston 28 it moves up against the base 26 of the mold cone 20, causing it to move up axially. As soon as the opposite facing cam surface 25 of the mold fingers 18 strikes the cam 17, the fingers of the mold 18 are displaced radially inwardly along the traces 24 and against the coupler as shown in FIG. Figure 8. The stroke of the piston is fixed in a control box (not shown) in such a way that the radial degree of corrugation is pre-selected. Different mold fingers are used for different categorical sizes of hose and couplers. The corrugation apparatus shown in operation can be observed in Figure 8. In operation, a hose coupler, .50 generally indicated at 50, is assembled at the end of the hose 78. In the case of the two-piece coupler shown, the sleeve -74 is first inserted over the end of the hose 78, and then the threaded male rod 74 is completely inserted with the hose end 78 abutting against the arm of the rod 84, and the arm portion 86 of the sleeve abuts against the hexagon 88 of a coupler 51. The resulting corrugated sleeve 74 is shown in the Figure 9. Corrugation with the corrugation mold of the present invention, having sixteen locations for the metal to flow during the corrugation process, results in a corrugated sleeve 74 having sixteen protrusions 76 circumferentially spaced around the sleeve 74 (see also FIG. Figure 3). As mentioned above, the prior art sleeves corrugated with eight mold fingers may have a tendency to be non-uniform or coarse due to insufficient pressure around the sleeve during the corrugation process. As a result, the extra metal flow between the mold fingers can form non-uniform and pointed protrusions in the corrugated sleeve. With the finger of the mold of the present invention, the groove 21 in the inner forming surface 19 provides an additional place for the metal of the sleeve to flow during the corrugation process. This additional place for metal flow results in a more uniform waviness around the sleeve 74. The sixteen locations, instead of the eight locations of the prior art, for the metal to flow during the corrugation process also results in an internal diameter of the rounder sleeve (DI). After undulating with an eight-finger mold, the internal diameter (ID) of the corrugated sleeve resembles an octagon. The apices of the octagonal conformation form potential filtration paths in the hose coupling. Adding a slot 21 to each mold finger 18 changes the internal diameter (DI) of the sleeve from an octagonal shape to a rounder shape. The rounder shape helps create less of a potential filtration path problem since there are no more octagonal apices in the internal diameter (ID) of the sleeve. The aforementioned description and illustrative embodiments of the present invention have been shown in the drawings and described in detail in various modifications and alternative embodiments. It should be understood, however, that the aforementioned description of the invention is exemplary only, and that the scope of the invention is limited only to the claims as interpreted in view of the prior art. On the other hand, the invention described illustratively herein may be practiced in a suitable manner in the absence of any element el. which is not specifically described in the present.