RU1786125C - Arrangement for transferring workpieces from oven to hardening tank - Google Patents

Abstract

SUMMARY OF THE INVENTION: the device comprises a suspension with pivotally secured holders of parts, for example, knives, rails, a square casing, provided with wedges mounted on a square casing and guides with a wedge surface made with a bevel angle, which ensures self-braking of the wedge pair and comprehensive compression during fulfilling the conditions p 2 arctan f, where (the angle of oblique of the wedges; f is the coefficient of sliding friction coefficient of the material of the wedges. 4 ill.

Description

The invention relates to the heat treatment of metals and alloys and can be applied, in particular, for hardening flat knives of rectangular and non-rectangular cross section.

The closest technical solution to the proposed is a device for hardening products containing a quenching tank with guides, a suspension and a telescopic casing with centering pins.

However, the absence of strict fixation of the product due to the need to install products with a gap in the guides and the telescopic casing does not completely prevent deformation of the product during hardening, especially of non-rectangular knives, and also does not eliminate the deformation of the product when it is captured from the furnace after heating.

- The aim of the invention is to improve the quality of products due to their comprehensive fixation.

Figure 1 schematically shows the proposed device, General view; figure 2 - cross section aa in fig. 1; in Fig.Z - section bB in Fig.1; figure 4 - node I in figure 1.

The device comprises a device for holding the knives in the furnace and a device for gripping and transporting the knives in the quenching bath. The device for holding knives in the furnace contains a truss 1 and a suspension bracket 2 mounted on it with articulated holders of 3 knives, guides 4. The device for gripping and transporting knives is a square casing 5 on which guides 6 of the traverse 7 are mounted guide rails 8, wedge 9, guide rails 10 with a wedge surface, connected to the traverse of the autostrop by rope 11. The angle of inclination of the wedges is selected from the condition

 arctan f, where p is the bevel angle of the wedges;

f is the coefficient of friction slip of the material of the wedges.

with

with

VI 00

about

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In this case, the relative movement of the wedges cannot begin under the influence of stresses. Plastic deformation of the knives during hardening due to the friction forces of the wedge pairs, which ensures reliable fixation of the knives 12 from four sides. The casing 5 is equipped with stops 13.

The device operates as follows. ..

The knife holding device is mounted by truss 1 on a shelf in the upper part of the furnace. The knives 12 are laid between the pivotally mounted holders of the knife 3 on the suspension 2. After heating the knives in the furnace to a predetermined temperature, the furnace lid opens and the knife gripping device is lowered into the hole of the truss 1. The fixture is guided by guides 4 and along. as the ends lower the walls of the square casing 5, the knife holders 3 rotate, releasing the knives that enter the gap between the wedge surfaces sufficient for two knives to enter freely. The gap is formed due to the fact that the autostrop is released and the wedge guides connected to the traverse of the autstrop 7 by the rope 11 are pulled up and apart to the sides by the guide bars 8. The gripping device. This is lowered on the stops 13, but the traverse of the autostrop 7 along the guides of the autostrop 6 and the wedge squares 10 connected to it continue to lower until the knives are clamped by the wedge surface -. mi and the latch of the autostrop will not work. Due to the self-braking of the wedge pairs, the knives are fixed on four sides.

Then. The knives pressed in the adaptation

transported to a quenching bath (on

not shown). As you go up

the fixtures, the knife holder 3 are returned to their original position. After hardening, the knives, without removing them from the device, are loaded into the furnace on vacation. A new cycle begins with loading the new knives in an addition to hold the knives in the furnace using the gripper (in reverse order).

Formula from the acquisition A device for transferring products from the furnace to the quenching tank containing a casing, fixing elements, guides placed on the supporting surface of the furnace or tank, characterized in that, in order to improve the quality of the products due to their comprehensive fixation, it is equipped wedges fixed on the inner surface of the casing, guide rails with grooves located in the upper and lower parts of the casing, and the fixing elements are made in the form of longitudinal guides with the ability to move with the wedge surface w, associated with the wedges, and the surface of the wedges is made with a bevel angle, which ensures the self-braking of the wedge pair with the fulfillment of the condition.

 arctg f; where is the bevel angle of the wedges;

f is the slip friction coefficient of the wedge material. .

W. ...

FIG 2

Editor

Compiled by N. Aseeva Tehred M. Morgenthal

Proofreader N. Revska