A method of obtaining a stepped hole details

 

(57) Abstract:

The inventive method of getting stepped bores in detail as follows. Produce partially filling the hole liner from the side opposite to the applied force. The annular ledge formed by extrusion from the degree of diameter equal to the diameter of the stage, with simultaneous formation over the face of the hardened liner layer and the hollow cavity. Then, applying an axial compression force to the end of the annular protrusion, produce filling the cavity with the formation of the supporting surface of the stage and then, removing the liner, apply axial force to the supporting surface of the stage. 7 Il.

The invention relates to metal forming, and more specifically to a method for producing a stepped hole in a sheet items, including hidden under mechanical point of connection.

A method of obtaining a stepped hole in which the workpiece is fixed on a base plate clamp and using a cutting tool to produce the removal of the required amount of material [1].

However, the known method does not allow to increase the strength characteristics of the parts with STU is analogo holes.

A method of obtaining a stepped hole in which perform the preliminary hole, make the filling, carry out the education level by squeezing the material around the perimeter of the preliminary hole and simultaneously forming an annular ledge followed by punching clean holes [2].

The known method does not provide sufficient hardening of the processed material due to the lack of isolation of the amount of deformation and, of course, its localization.

The basis of the invention is to provide a method of obtaining speed holes in parts that provides the required pererabatyvaemogo structure of the processed material through the formation of a local hardened layer consisting of two parts with different intensity hardening.

This problem is solved by a method of obtaining a stepped hole parts, which perform the preliminary hole, make the filling, carry out the education level by squeezing the material around the perimeter of the preliminary hole and simultaneously forming an annular ledge followed by punching finishing OTE applied force, the annular ledge formed by extrusion from the degree of diameter equal to the diameter of the stage, with simultaneous formation over the face of the hardened liner layer and the hollow cavity. Then, applying an axial compression force to the end of the annular protrusion, produce filling the cavity with the formation of the supporting surface of the stage and then, removing the liner, apply axial force to the supporting surface of the stage.

Implementation of the proposed method to obtain a stepped hole parts can improve the strength characteristics of the components with shaped cavities due to the intensification of the alternating deformation process pererabatyvaemogo structure of the processed material.

The technical result provided by the declared method is determined by the fact that the formation of the annular protrusion above the surface of the part is implemented by a scheme similar to the scheme backward extrusion. While the course material is localized at the surface of shear, and the prevailing here the deformation is deformation strain. During compression of the processed material, when a deforming force is applied to the annular surface of the ledge, preoblem is by distortion of the structure of the processed material as on the available surfaces of the shift, as well as in the adjacent layers. Thus, the two parts of the hardened layer and ensure increased durability as forming the hardened layer, and also details with shaped cavity.

In Fig.1 shows the initial position of the die tooling prior to application of axial force on the diameter, the smaller diameter step of Fig.2 - the stage of completion of the application of axial force on the diameter, the smaller diameter step, with the formation of the annular protrusion above the surface of the part of Fig.3 - initial position of the die tooling prior to application of axial force to the end surface of the annular protrusion, and Fig.4 - stage process completes the formation of the hardened layer, and Fig. 5 - stage process completes, education level, and Fig.6 - initial position of die tooling before punching clean holes; Fig. 7 - detail of a part with a stepped hole.

Sheet metal part 1, for example from an alloy B95 with preexisting hole of diameter d is placed on the plate 2. In hole details establish the liner 3 with length smaller thickness H of part 1, so that over a free end of the liner 3 is formed a cavity of diameter d and length h. Item 1 fix PR is Rami: diameter-speed - D1equal to the desired diameter of the future steps in part 1, the depth level h1and hole diameter Dabout. With the stage facing the surface of the workpiece, and during installation of the clamp 4 provides the alignment axis of the stepped hole relative to the axis of the liner 3. In the hole of the clamp 4 of diameter Daboutinstall the landing motion of the punch 5 (Fig.1).

Implementation of the invention is as follows.

When the impulse force of Pthe punch 5 in the first stage of the formation of the hardened layer is axial plastic compression of the material of the workpiece along a circular surface covered by the diameters d and dabout.

Since the diameter Daboutpunch 5 less than the diameter D1the upper clamp 4, it is possible expiration of the extruding material in the direction of the cavity with diameter d and in the direction of the free volume formed by the notch in the clamp 4.

At the final stage of the first stage (Fig.2) are formed in the hardened layer thickness h, placed between the liner 3 and the plug 5, and the annular projection with geometric dimensions: external diameter D1; inside is an increase in the material of the workpiece 1 during the formation of the 1st part of the hardened layer is localized on the surface of the second order with generatrix AB.

Then the clamp 4 is replaced by the clamp 6 with a hole having a diameter D1and the punch 5 is replaced by a plug 7 having a diameter, made by planting movement in relation to the diameter of the hole in the clamp 6. Thus, the plunger 7 is disposed on end surface of annular projection (Fig.3). After removal of the plug 5 from the workpiece 1 in the past is blind cavity above the hardened layer thickness h.

Next, form the second part of the hardened layer, which is applied impulse force to the end face of the plunger 7.

The result is a plastic compression of the processed material on the annular surface of the ledge. Due to the presence of one degree of freedom for the flow of the workpiece material, namely in the direction of the axis of the hollow cavity, it is at a certain stage of the process is carried out on the same surface of the second order with generatrix AB. The filling volume of the hollow cavity leads to the formation of the hardened layer thickness h** (Fig.4). In other words, at the final stage of the second stage of the formation of the hardened layer total thickness is h* + h**), but due to the alternating deformation of the processed material, the intensity of his hardening will be different. Obviously, in sochineniia the workpiece material while maintaining the same thickness, that and in the process provided by the prototype.

Next, replace the plate 2 on the matrix 8, obespechivala the alignment of its hole axis of the punch 7. Preparation remove the rod 3 and, applying an impulse force of Pto the end face of the plunger 7, produce education level required depth h2(Fig.5) during extrusion of the processed material into the hole of the matrix 8.

Then start punching clean holes. To this end, replace the clamp 6 clamp 9 and the plunger 7 to the punch 10. The last axis coaxial to the axis of the holes in the matrix 8. The impact of the efforts of the Pthe punch 10 provide high quality hole punch (Fig.6), which completes the technology of stepped holes (Fig.7).

P R I m m e R. the Method has been pilot tested upon receipt of the stepped hole mechanical point of connection to the sheet blanks of alloy WET thickness 6,0 mm Stepped holes had the following geometrical dimensions: hole diameter 4.0 mm; the diameter of the speed of 8.0 mm; depth of speed of 2.4 mm

The stamping step holes was carried out during the formation of the hardened layer in two stages: the first stage formed UE the apostrophes: outer diameter: 8.0mm; an inner diameter of 6 mm; the height (length) of 0.6 mm At the second stage produced the final formation of the hardened layer with a maximum diameter equal to 8.0 mm Stamping step holes made in steel snap (steel WA), made on 7-th degree of accuracy and had a hardness of HRC 56-58 units

As the Executive body of the used tool head with hosted her drummer weight 450 g

The power drive was magnetic impulse installation Miu-10.

Fixation of the workpiece in the die tooling carried out on a hydraulic press, developing maximum force of 40 kN.

The first, second stages of the formation of the hardened layer, the punching speed and punching clean holes were performed at energies discharge magnetic-impulse installations (IIM), respectively, 1.6 and 2.2, 2.5 and 2.0 kJ.

Metallographic analysis of the deformation zone (region hardened layer) confirmed the increased intensity of hardening of the processed material on average by 23% relative to the intensity of hardening of the material upon receipt of the same by the geometry of the stepped bores, but technology provided the prototype for the attachment of a responsible power sets in the construction of aircraft, ship structures, etc.

A method of OBTAINING a STEPPED HOLE PARTS, which perform the preliminary hole, make the filling, carry out the education level by squeezing the material around the perimeter of the preliminary hole with simultaneous formation of circular ledge with the subsequent punching clean holes, characterized in that produce partially filling the hole liner from the side opposite to the applied force, the annular protrusion is formed by extrusion from the degree of diameter equal to the diameter of the stage, with simultaneous formation over the face of the hardened liner layer and the hollow cavity, and then, applying an axial compression force to the end of the annular protrusion, make filling the cavity with the formation of the supporting surface of the stage and then, removing the liner, apply axial force to the supporting surface of the stage.

 

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