Device for hardening holes

 

(57) Abstract:

Device for hardening of holes can be used to harden the holes, for example bolted, by means of surface plastic deformation. At the same time, two-way reinforcement of the edges of the holes through the two punches. Both plugs have a Central through hole, and a single induction-dynamic actuator in the form of a flat current-carrying coil, copper disk mounted on one of the punches, and pre-charge capacitive energy storage. Punches and coil mounted on a common shaft, which is inserted into hardened hole. With one punch with a fixed copper disk has a code landing on the rod. This punch is mounted on the rod so that the copper disk was located next to the coil. Another punch, located on the opposite side hardened hole, has a rigid threaded mount on the rod. 2 Il.

The invention relates to the processing of materials and products from them, namely, devices hardening metal by methods of surface plastic deformation.

One of the most important structural elements, CLASS="ptx2">

The known device processing internal poverhnosti holes rocketcam [1], comprising a power element with balls or rollers.

A common feature of the analogue and the claimed device is the presence of strong reinforcing block.

The described device is quite effective, however, inconvenient to operate, especially in the field (not in the steel mills) in the processing of previously drilled holes, have low productivity. The disadvantage is the need to adjust desktop size rolling depending on the source of the diameter of the hole.

Also known similar devices containing hydraulic radial press with a punch to harden previously captured frame and the roller rolling.

A common feature of the analogue and the inventive device are the existence of a punch.

These devices implement both technology of surface hardening of the holes, therefore, can be implemented as appropriate for weight and performance. However, they have low productivity and can't handle holes without chamfers.

Prototype technical susn is of the edges.

A common feature of the prototype and the claimed invention is the presence of a punch.

This device has a high efficiency hardening of bolt holes, measured in absolute value and relative increase in the fatigue limits of bolted joints.

The drawback is the large size and weight and, as a consequence, the impossibility to use in the field (operational) conditions.

The purpose of the invention is the improved resistance of structural engineering elements having apertures, for example bolted, fatigue.

The goal is achieved using the method of surface plastic deformation of the holes. In many cases, a device for hardening should work not only in stationary(Zavodsky) conditions, but also in operational, i.e. directly in the process of maintenance of any machine-building complexes or products. For example, it is expedient to consolidate the bolt holes in the rails in the field. Thus it is possible to prolong the service life of the rail without replacing them.

Therefore, first, the requirement of small mass and size parameters of the device hardening, katoh, device hardening should have a sufficiently high performance, otherwise it may be economic feasible.

The technical result that can be obtained by carrying out the claimed invention, is to reduce the weight, dimensions and performance.

The essential features characterizing the invention include the punch, however, unlike the prototype, made with a Central hole and firmly attached to the annular disc made of a material with high electrical conductivity, added flat ring current coil, the conclusions of which is connected via a key element to the capacitive energy storage device, a rod threaded on one end and a power part of enlarged diameter at the other end, and a second punch, made in the form of a cap nut, and the shaft is installed in hardened hole in such a way that on the one hand holes on the rod freely installed coil and the first punch, but on the other hand on the rod wound on the thread of the second punch.

Signs, distinctive features of the prototype include the presence of two punches instead of one, and has a Central skou. Also added a flat ring current coil, the conclusions of which is connected to the newly introduced key element and a capacitive energy store. Additionally there is a rod with threads on one end and a power part of enlarged diameter on the other. These elements have the following mutual arrangement. The rod is installed in hardened hole so that one side of the hole to the specified shaft freely mounted a coil and the first punch, and on the other side wound on the thread of the second punch.

The set of essential features, including two punch with a common drive (mechanical connection), allows for two-sided coating of holes, which reduces the number of operations and improves performance.

The only element that secures the device in place is the punch, made in the form of a cap nut. The convenience and ease of fastening also determine the increase in productivity. Union nut can be secured even without the key, manually. The device does not require long preparation work and installation.

When using, for example, rail is isawanya one drive (coil, copper disc and capacitive energy storage are induction-dynamic drive) to initiate movement of the two plungers defines a low weight and small dimensions of the device.

For example, to improve the fatigue resistance of railroad rails in the area of the bolt holes on 50% of the required device hardening with dimensions of 140 x 230 mm and weight of 6 kg (without capacitor Bank). The capacitor Bank in this case has a size of approximately 420 x 300 x 190 mm and a weight of 32 kg

For charging capacitor banks can be used the standard scheme with one - or full-wave rectifier.

In Fig. 1 presents the proposed device; Fig. 2 - power unit (without capacitive energy storage and the scheme of its charge).

The device comprises a cylindrical rod 1 with the power part (thickening) 2 large diameter, which is integral with the shaft or has a tight fit on the rod. The rod 1 free set of flat circular current-carrying coil, consisting of an electrically insulating frame 3 and winding 4 and the plug 5. Reinforcing portion 6 of the plug 5 can be made of higher quality metal. The punch 5 is rigidly clucene through the key element 8, for example, closing an electrical contact to a pre-charged capacitive drive 9 energy. On the other end of the rod 1 and the thread is wound, the second plug 10 made in the form of a cap nut.

Reinforcing edge punches made in the form of rounded chamfers.

The device operates as follows.

The rod 1 are installed on the coil (frame 3 with the winding 4 and the plug 5 is inserted into hardened hole, such as bolt hole in the rail the rail. On the other hand on the rod 1 wind the punch 10 and tighten it with a wrench. This rounded shaped edges of the punches is partly to get in a hardening of the hole.

Copper disc 7 with nearby current windings 4 are induction-dynamic drive. To effect the hardening of the hole (pulse load) close contact (item 8). Then pre-charged capacitive drive 9 energy (capacitor Bank) is discharged to the coil 4. In the copper disk 7 will be the induction of electric currents that interact with the current in the winding 4 will result in rejection of the disk 7 with the plug 5 from the coil.

Under the Oia, acting on the coil will be transmitted through the force part 2 of the rod 1. The rod 1 will move, pulling the plug 10. The punch 10 will hit harden the hole from the opposite side.

The mass of the punch 5 and the power section 2 of the rod 1 must be equal to the strain hardening harden the holes on both sides was the same.

DEVICE FOR HARDENING of the HOLES containing the punch, characterized in that, in order to reduce size and weight and improve performance, the device has a flat annular current coil, the conclusions of which is connected to the capacitive energy storage device, a rod threaded on one end and a power part of enlarged diameter at the other end and more punch in the form of a cap nut, and the main punch is made with a Central hole and with a fixed disk of a material with high electrical conductivity, while the coil and the main punch freely mounted on the rod, and the extra punch on the threaded rod.

 

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