DE2231714B2 - Table knives made by die forging - have grooved blanks for separation after completion of blades - Google Patents

Abstract

The table knife blades are made in pairs from blanks by forging. The knife blades are held together at the ends where the handle sill be subsequently fitted. The manufacturing process is simplified by completing the blades before separation into individual blades. This process prevents damage to the already fitted handle during the final stages of knife manufacture. The knife blades are die forged or rolled, cut to profile, hardened and ground. The finished knife blades are readily separated at the groove cut into the joining section. The finished blades are held together by their end where a handle is later fitted.

Description

The invention relates to a method for manufacturing fishing knives without a fishing rod of a blank in which two crop knife blade blanks are connected on the side of the later booklet, the following manufacturing steps being carried out: drop forging and / or rolling, cut. Separating, hardening. Ribbons.

From the DTPS 7 33 414 a method for the production of tongued crop knife blades is known, in which a profile band is first produced by rolling, which in cross section has two crop knife blade blanks corresponding to that on the side of the later booklets are connected by hinges protruding from the heads. The one in goiter shaping necessary shaping work, e.g. B. profile milling is carried out before the blanks are separated into individual workpieces. Any further processing, In particular, the grinding and other fine machining takes place after the blade blanks have been separated from one another.

Even with the manufacturing processes for knife blades that are currently customary in practice, these are processed individually. It is known, for example, to use blade blanks, so-called split pieces, from a steel strip. to split them off, then to heat them, to align them, to forge them into Cut the shape and press it flat. The resulting blade blank is then processed through several grinding operations. Finally, the contact surface for the handle is ground. The finished one The blade is inserted into the handle with the tang and firmly connected to it. so

In all common manufacturing processes, at least the fine and final machining, and usually even the entire machining, is carried out on the individual workpiece. This individual processing is not only relatively expensive; Rather, it has the major disadvantage that it is not possible to work the blades very precisely, especially in the crop area. This is because only the thin tang is available for tensioning or holding the blades during processing, which bends easily and also does not have an exact f> o Forms clamping surface. When connecting the blades to the handle, there are differences in dimensions between the bolster and the handle face, which are caused by the grinding of the Goiter must be balanced by hand. This is a very difficult and difficult one to do Process because the booklet must not be damaged when sanding, especially if it is a silver-plated handle.

The invention is based on the object of a method for producing attached crop knife blades to create, in which a raw part is assumed in which two goiter knives blanks on the Page of the later issues are related, drop-forged and / or in the further processing is rolled, cut, separated, hardened and ground, this process being more rationally feasible and in particular to more precisely machined blades should lead.

According to the invention, this object is achieved in that grooves are worked into the crooked point of the blade blanks directly connected to the crooks, and that the separation into individual blades only takes place after the essential shaping processing steps have been completed

In the method according to the invention, blade blanks are first produced, which are directly attached to the Goiters related. In the thickening that forms the bolster area of both blades, grooves are worked into which the double raw workpiece precisely can be stretched and held. All essential shaping processing steps are then executed on the double workpiece. This enables more efficient processing than the shaping the single blade and, above all, because of the fixed and correct clamping of the double blank in the Bolster area, a very precise processing of the two blades so that they then fit and without essential post-processing can be linked to the issue.

From OE-PS 66 216 it is already known to produce goiter-free knife blades, such as those used for example in pocket knives, from KUngen blanks that are connected in pairs and in this state are subjected to all essential shaping processing steps. Headless Blades provide sufficient contact surfaces for tensioning and holding the double blank precisely because they have essentially the same thickness over the entire length of the double blank. The transfer of the the OE-PS 66 216 known manufacturing process on the production of crop knife blades stood the Difficulty countering that the blanks of crop knife blades are a necessary for crop formation, have relatively irregular thickening, which makes a clean clamping impossible. Presumably that's why, despite the very old proposal of the OE-PS 66 216 crop knife blades always individually finished in order to attach the individual blades to the dated To be able to hold or tighten a goiter outgoing fishing rod

The invention is described below using an exemplary embodiment in conjunction with the drawing explained in more detail. It shows

F i g. 1 is a perspective view of a rolled profile from which crop knife blade blanks can be produced,

F i g. 2 shows a plan view of a steel strip suitable for producing split pieces for crop knife blade blanks;

F i g. 3 is a perspective view of an im In the course of the method according to the invention produced double blade blank and

F i g. 4 shows a plan view of a pair which have been finished by the method according to the invention, but are still knife blades not separated from each other.

In the method according to the invention play each other

the operations as follows:

First, a blade blank comprising two raw blades is made 1 generates in FIG. 3 one is shown. It consists primarily of a cross-section rectangular bar, which has a thickening of 2 s in the Uitte The two raw blades are arranged in such a way that the end of the booklet is towards the middle lie. The thickening 2 is used to form the crops.

The blade blank 1 can be obtained in various ways. In Fig. 1 shows a rolled profile, which it can easily be sheared off. This rolled profile has thickening on both sides of the middle a groove 3, which will later be etched for clamping and centering the blank. In Fig. 2 is a steel strip is shown, from which the blank in the form of so-called split pieces 4 are split off can. While the blank punched from the rolled profile is in the profile of the two connected blanks is already quite similar and only needs to be machined by grinding operations the split piece split off from the steel strip, as is customary in blade production, only by heating, Straightening, pre-cutting in the in F i g. 3 shown blank shape are brought to then by finish forging and shape cutting to achieve the initial state for the grinding operations. The middle one large-volume straight part 5 of the split piece 4 later forms the thickening 2 of the blank. In one out a split piece is produced, as shown in FIG. 3 is indicated by dashed lines for better clamping and centering a groove is incorporated before further processing. This groove can be machined without additional costs be incorporated into the operations of pre-forging and finish forging or rolling.

The in F i g. 3 shown blank is now finished on both sides in the usual way In the middle of the Thickening it is held by clamping elements.

In Fig. 4 shows the finished, but still interconnected knife blades. These are at their connection point after the essential shaping processing steps have been carried out separated from each other and welded to a handle on their goiter side

The invention is not restricted to the exemplary embodiment shown. It is therefore conceivable to use the blade blank made from rod material. To do this, the rod material is corresponding to the volume of two blades cut to length, heated once in the middle of the section and compressed to a thickening. Afterward the blank is passed through a roller. It is also conceivable to attach to the blade in the usual way to attach a hinge after finishing and then to fasten it in the handle.

1 sheet of drawings

Claims (1)

Claim: Method for manufacturing fishing knives without fishing rod, starting from a blank, in which S jcwei goiter knife blanks on the side of the later booklets are connected, with the following Manufacturing steps are carried out: drop forging and / or rolling, cutting, separating, Hardening, grinding, characterized in that grooves are worked into the blade blanks directly connected to the crooks, and that the cutting is carried out in Individual latches only take place after the essential shaping processing steps have been completed