DE1023535B - Device for inductive hardening of elongated round parts, such as drills or the like. - Google Patents

Description

GERMAN

For the continuous inductive hardening of long stretched Round parts, such as drills, single or multi-turn heating conductors are known in which such a workpiece can be inserted and heated therein. The single-wind heating conductors are suitable bad for heating such workpieces, especially when it comes to high-speed steels with high Hardening temperatures and long holding times, because the heating is too fast and under certain circumstances is going on unevenly. For these reasons, the feed method is also not suitable for Hardening of such workpieces, since temperatures of around 1300 ° are required for this, for example.

To improve the above-mentioned method, a multi-turn heating conductor is already so large designed that several workpieces find space in it, each of which is in the heating on The most advanced deterrent was expelled and replaced by a new, cold one. at such multi-turn heating conductors of larger cross-section occur both high potential differences inside as well as outside the working group, so that isolation difficulties exist. aside from that the high inductance of such a coil is disadvantageous; the tuning of the generator's resonance circuit is made more difficult.

According to the invention there is now a device for the continuous inductive hardening of elongated Ruodteile proposed, which is characterized in that two each other on something more as a workpiece diameter parallel opposite flat sheets are provided as heating conductors, which are preferably to achieve a meandering current flow with slots in the feed direction are provided, and that in the lower, slightly inclined sheet metal heat-resistant rods, for example from Quartz, on which the workpieces are at the same distance from both halves of the inductor move due to their own gravity in the feed direction.

The drawing explains an embodiment of the invention. In the figure, 1 and 1 'represent the two opposite sheets of the heating conductor. 2 and 2 'are the connections for the feed the high-frequency energy ,, which is connected in a special way according to the invention with the heating conductor are. 3 are the slots in the metal sheets. These slots are in the direction of flow and in the direction of advance Work pieces. The slots can only be provided in one sheet metal as well as in both. 4 are quartz rods, which are embedded in the lower sheet and on which the workpieces due to the slight inclination the device to the horizontal and their own gravity roll down one behind the other. 5 are more Device for inductive hardening

of elongated round parts,

like drills or the like.

Applicant:

LICENTIA Patent Administration - G. m. B. H., Hamburg 36, Hohe Bleichen 22

Dr.-Ing. Kurt Kegel, Berlin-Wilmersdorf,
has been named as the inventor

Quartz rods against which the finished heated workpiece rests before it is ejected by hand or by a mechanical ejector, for example 6, which can be controlled by a control pyrometer. The control pyrometer controls the ejector depending on the temperature of the workpiece, which is optically monitored by the device.

A suitably arranged feed device 7, which can for example consist of an inclined plane 8 and a magazine 9, completes the device according to the invention.

The cooling of the heating conductor according to the invention is expediently carried out by soldered-on cooling tubes that are flowed through by a coolant, for example water. To simplify the drawing is the cooling device is not shown.

For quenching, the workpieces are removed from the device by hand or by a controlled one Ejector thrown out directly into a quench bath, the · water, oil or other suitable Medium 'contains.

Workpieces made of high-speed steel can advantageously be of a type known per se to improve the structure Subcooling treatment in a cold solution consisting of. Carbonated snow and acetone ,, at about -70 to -75 ° C.

Claims (6)

Patent claims: 1. Device for the continuous inductive hardening of elongated round parts, in which The heating conductor consists of two current-fed sections, between which the sections to be heated are located Workpieces are, characterized in that two each other to slightly more than workpiece diameter parallel opposite plane 709 877/223 Sheets are provided as heating conductors, which are preferably used to achieve a meander-shaped Current course are provided with slots in the feed direction, and that in the lower, slightly inclined lying sheet metal heat-resistant rods, for example made of quartz, are embedded on which the Workpieces at the same distance from both halves of the inductor due to their own gravity in the feed direction 'move. 2. Apparatus according to claim 1, characterized in that for feeding the workpieces to the heating conductor there is an expediently inclined plane on which the workpieces, coming from a storage magazine, roll due to their own gravity. ¹ p 3. Device according to claims 1 and 2, characterized in that the heated workpieces be ejected by hand. 4. Device according to claims 1 and 2, characterized in that the heated workpieces be ejected by means of an ejector. 5. Apparatus according to claim 4, characterized in that that an ejector is provided which is controlled by an optical control pyrometer will. 6. Device according to claims 1 to 5, characterized in that a quenching bath, preferably water or oil bath, is provided into which the ejected workpieces fall. Considered publications:
German Patent No. 862,200;
British Patent No. 717 067.
Journal "Werkstattechnik u. Maschinenbau", October 1951, p. 404. 1 sheet of drawings © 709 877/223 1.58