A method of manufacturing proposedly rod speed parts

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of parts like rivets, buildings thorn, shafts, axles and fingers on the cold machines. Cut off the workpiece length and consistently carry out its calibration with the extrusion basting, direct extrusion with obtaining hollow cavity at one end of the rod blank, the receiving speed of the semi-finished product by reducing the blanks in the matrix by crimping the wall of the hollow cavity and the calibration of the hollow cavity on the calibrating mandrel, and the final formation of the head at the other end of the rod. Crimping the wall of the hollow cavity is produced on the calibrating mandrel. The last feature floating in the deformation of the crimping of the conditions for the subsequent calibration of the friction forces between the mandrel and the wall of the hollow cavity, the retaining carried by a workpiece holder and not preventing the axial flow of the metal wall of the hollow cavity. The result is an increase tool life and improve the quality of the parts. 2 Il.

The invention relates to the processing of metals by pressure and can be used in the manufacture on dewysocki machines.

A known method of manufacturing proposedly rivets, which cut the rod billet gauge length and produce deformation in a few transitions with the formation of a head on one end of the rod and the hollow axial cavity on the other, in the process of deformation of the workpiece sequentially perform its calibration with the extrusion basting, direct extrusion with obtaining hollow cavity at one end of the rod blank, the reduction in the matrix with a tapered deforming part with the receiving speed of the material with a conical transition surface between the steps located at the lower end stage hollow cavity, the diameter, depth and wall thickness of which is equal to the corresponding parameters of finished parts, and the final design of the rivet head (see RF patent 2107574, CL 21 To 1/60).

The disadvantage of this method is the low resistance of the tool on the operations of direct extrusion of hollow cavity, the reduction in the matrix and in the final operation of forming the head, due to suboptimal true deformations in direct extrusion of hollow cavity. This method does not ensure the formation of a hollow cavity with SF conical deformation of the matrix. In addition, field tests showed that when the final design of the head part is not filling angle of the head from the side of the small stage, due to the high conical part, generated by reducing it to the previous transition. Reducing the height of the conical part due to the increase in the angle of reduction and crimping to improve the quality of the filling head with its precipitate results in an increase in non-uniformity of the wall thickness and the formation of folds due to compressive meridional and tangential stresses and bending at the exit of the conical deforming portion in the cylindrical calibrating.

The closest in technical essence to the proposed and achieved result is a method of manufacturing proposedly rivets, which cut the workpiece length and consistently carry out its calibration with the extrusion basting, direct extrusion with obtaining hollow cavity at one end of its shaft, the reduction in the matrix with a tapered deforming and output calibrating parts with obtaining step of semi-processed material located at the lower end stage hollow cavity and the final design of the head on the other end. Ed the military from the end of the smaller stages, without deforming the conical part of the matrix. Axial over the metal wall of the hollow cavity and form set by changing the contact friction or configuration of the output portion of the matrix in the following ratio of the sizes of the hollow cavity: S/Ddet>0,2, where S is the wall thickness of hollow cavity part; Ddet- the outer diameter of the hollow wall cavity (see RF patent 2175277, CL 21 To 1/60, 21 J 5/06).

The disadvantage of this method is the low resistance of the calibrating mandrel located outside the conical deformation of the matrix, as a result of acting on her butt load from the present wall thickness variation that occurs when crimp bulk. As the sizing mandrel is positioned outside of the conical deformation of the matrix, it is not involved in the process of crimping the blank and calibration blank arise shear deformation in the axial and radial directions and the load acting on the end face of the mandrel from deformable material having a wall thickness causes bending moments on the mandrel, which reduces its resistance. Furthermore, the method does not solve the task of filling heads in the outer corner side end face lesser degree to ocontainer the transition of its formation, oprawki and the deterioration of parts due to the presence and strengthening of shear deformation.

The objective of the invention is to increase tool life and improve the quality proposedly rod speed parts, in which the relative thickness of the walls of the hollow cavity S/Ddet>0.2 and the relative depth of the cavity hdet/ddet>2,5.

This object is achieved in that in the proposed method of manufacturing proposedly rod speed parts, including the segment of the workpiece length and sequentially carry out the calibration of the workpiece by extrusion basting, direct extrusion billet with getting on one end of the rod hollow cavity, the reduction in the matrix by crimping the wall of the hollow cavity, calibration holes on the frame and receiving speed of the intermediate product and the final shaping of the head on the other end of the semi-finished product, unlike the prototype of the calibrating mandrel have a "floating" in the deformation of the crimping i.e. directly in the conical part of the matrix, and then she held by the forces of friction and the influence of the workpiece, calibrate hollow cavity, with the axial flow of the metal wall of the hollow cavity prevents the frictional force created by the mandrel.

The essence of izobreteniyami when multioperational stamping on cold machines proposedly rod parts with relative wall thickness of 0.2; - Fig.2 - position of the workpiece and tool at the moment of contact between the workpiece and the mandrel when the crimping is "a", and at the time of forming the semi-finished product on the mandrel - "b".

When crimping the wall of the hollow cavity of the semi-finished product on a "floating" calibrating mandrel eliminates the impact load and axial stresses on its end face, reduces the deformation force and ensures that the process is uniform axial flow of the metal, which allows to increase the total angle of the conical part of the matrix60oby reducing its height, to eliminate not filling head for a subsequent position. The method allows to increase the depth of the calibrated cavity, the value of which may exceed 2.5 of its diameter, to reduce the relative wall thickness of the cavity to a value of S/Ddet=2, while the magnitude of the true strain at this operation by assigning within 0,36...0,51, providing maximum resistance floating mandrel, the stability of the process and high quality semi-finished product in their geometrical dimensions. In the final operation of forming the head part draught is achieved by filling angle by reducing the height of the conical part at the previous transition.

The proposed method allows for the measuring of deformations in the radial and axial directions pre-extruded hollow wall cavity and to increase the resistance of the pot.

The method is as follows from the rod or riot steel 10 with a tensile strength of 400 MPa cut the workpiece length and sequentially carry out the calibration of the workpiece draft up to the outer diameter of 6.65 mm alignment of the ends and squeezing basting, direct extrusion of hollow cavity inner diameter wall 4,22 mm, an outer diameter wall of 6.8 mm, a depth of 4.7 mm with the true deformation 0,482, the reduction in the matrix by crimping the wall of the hollow cavity on the floating calibrating mandrel with the true deformation of 0.51, with the inner diameter wall of the hollow cavity of 2.5 mm, an outer diameter wall 4,82 mm, corresponding parameters of finished parts, then calibrate the workpiece with simultaneous final formation of the head and chamfers on the size of the finished piece.

Thus, the claimed invention allows to increase the tool life and the quality proposedly core parts of stepped form in the manufacture of the cold machines.

Claims

A method of manufacturing proposedly rod speed parts, including the segment of the workpiece length and sequentially carry out the calibration of the workpiece with Vidalia the speed of the semi-finished product by reducing the blanks in the matrix by crimping the wall of the hollow cavity and the calibration of the hollow cavity on the calibrating mandrel, and the final shaping of the head at the other end of the rod, characterized in that the crimping of the wall of the hollow cavity is carried out on the calibrating mandrel, which have floating in the deformation of the crimping of the conditions for the subsequent calibration of the friction forces between the mandrel and the wall of the hollow cavity, the retaining carried by a workpiece holder and not preventing the axial flow of the metal wall of the hollow cavity.

 

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