The method of forming a ball pin

 

(57) Abstract:

The invention relates to the field of cold forming processes core products with heads such as ball of the toes. The method of forming the ball of the thumb is that the first two transitions preliminary landing head stamp two conical section with the intermediate barrel-shaped element, to which a conical sections abut on large grounds. And on the first and second transitions volume of stamping heads set in a certain ratio relative to the volume of the sphere is ready finger, while the diameter of the larger base of its conical sections - in a certain ratio relative to the diameter of the sphere ready finger. The angle of the forming cones with the longitudinal axis of the workpiece set within certain limits for the first and second transitions. On the third transition draught form a core part of the finger and punched a spherical head. On the fourth transition reducing the area of the rod under the knurling thread. The technical result of the invention is to improve the stability of the stamping process.

The invention relates to the processing of metals by pressure and can be used for stamping the core product is in, namely, that the stamping of finger exercise for two transitions: the first transition, using the operation of direct extrusion, to form a cylindrical shank and a conical segment with a length not more than 1.2 original diameter of the workpiece, the second transition in the initial forming of the workpiece is fixed in a matrix on the entire surface of the previously formed on the first transition of the conical section and a cylindrical shank, and then punched a spherical head, conical and cylindrical sections of the rod (see ed.St. USSR N 1252010, 21 TO 1/00).

The disadvantages of this method are low tool life first transition due to the large degrees of deformation and forces during extrusion of the shank and the tapered section and the instability of the process of forming the spherical head due to longitudinal bending of the deformable section of the workpiece because of its great height.

The closest to the technical nature of the claimed object is a method of forming a ball pin for the three transitions. At the first transition of the pre-reducing terminal and provide the first preliminary landing heads, simultaneously forming cilindri is the volume finally stamped the spherical head. We formed on the first transition head higher ground adjacent to the core part. On the second transition again reducing the rod, forming the cylindrical and conical sections of the rod draft and implement the second preliminary landing head in the form of a cylinder and a cone with a large base, adjacent to the terminal. On the third transition punched a spherical head of a finger. (see "Development of technology for cold heading the ball stud for the conditions of small-scale production at JSC "MKZ"/ I., Gong, D. C. Krivosheev, P. E. Levchenko, etc.// Progressive solutions in the hardware industry. Sat. the scientific. Tr. Magnitogorsk, 1996, S. 94-97).

In the manufacture of ball finger on the above technologies in the stamping process are cases of curvature of the axis of the workpiece on a separate transitions, which reduces the stability of the process and product quality, as stamped spherical heads have folds and offset from the axis of the rod. The combination of the operations of reduction and landing heads on the second transition metal stamping reduce the resistance reducing matrix and ejector, as when transplanting the head end of the workpiece rests on the ejector and producirovanie castanheda re-reduction of the area under the action of a considerable effort on the ejector and calibrating the band of the matrix.

The basis of the invention tasked to develop such a method of manufacture of the ball stud, which would provide the necessary stability of the process by preventing bending of stamping blanks on the first and second transitions by reducing the height of the planted areas while increasing tool life for the reduction due to the reduction of effort on it.

This is achieved by the known method of forming finger including a preliminary reduction of the workpiece, the subsequent preliminary landing head for two transitions with simultaneous formation of cylindrical and conical sections, forming the core of the finger slump, the final reduction of the rod under the knurling thread and the final stamping of the spherical head of the finger, according to the invention, the first two transitions preliminary landing head stamp two conical section with the intermediate barrel-shaped element, to which a conical sections abut on large grounds, and on the first transition volume stamping head is set in the range of 0.6 - 0.75 volume of the sphere is ready finger, the diameter of the larger base of its conical sections take the main 5-9oon the second transition volume stamping head is set in the range of 0.8-0.9 volume of the sphere is ready fingers, the diameter of the larger base of its conical sections is equal to 0,75-0,85 diameter sphere ready finger, and the angle forming a conical sections with the longitudinal axis - 10-15oand the final reduction of the rod under the knurling thread is carried out after the final forming of a spherical head.

The invention is illustrated by drawings, where:

- Fig. 1 shows a process flow diagram punching ball for four transitions (original cylindrical billet; b - I transition stamping; - II transfer; g - III transition; d - IV transition);

- Fig. 2 - position of the workpiece and tool at the start and end time of forming a head on the first transition;

- Fig.3 - the same at the second junction;

- Fig.4 is the same at the third passage.

The method of forming a ball pin is as follows. Cut off from botofogo metal of the workpiece 1 in the form of a rod (Fig. 1A) is served on the first position of the press, where the matrix 2 (Fig. 1B and Fig.2) first pre-reduction shaft, and then when the bearing piece on the end of the ejector 3 in rabochikh sections 6 with the intermediate barrel-shaped element 7. Moreover, the conical sections 6 facing large bases towards each other and are associated with the bases of the intermediate barrel-shaped element 7. On the first transition volume stamping head is set in the range of 0.6 to 0.75 of the volume of the sphere of the finished product, which reduces the height of the stamping area of the workpiece and reduces the likelihood of buckling. Also, the diameters of d1large grounds conical sections 6 is chosen equal to 0.6-0.7 diameter D of the sphere of the finished product, and the angle1slope forming with the longitudinal axis of the billet - 5-9o. Using parameters d1and1less than the proposed limits increases the overall height of stamping on the second transition section of the workpiece, causing it to bend on this transition. When using parameters d1and1more of the claimed limits increases the likelihood of buckling at the initial phase I of the transition. Stamped on the first transition of the workpiece ejector 3 is removed from the matrix 2 and transferred to the second position stamping, where with the help of plug 8 (Fig. 1 and in Fig. 3) in the matrix 9 stamp head in the form of a cylinder 10 and the two conical sections 11 with the intermediate barrel section 12. The volume of the head is set within the Delia, and the angle2slope form to the longitudinal axis of 10-15o. If you use the parameters d2and2less than the claimed range, it increases the initial height of stamping on the third transition area of the workpiece, which leads to the curve of this plot in the landing of the spherical head. When d2and2more of the proposed limits is bending stamping area at the initial stage II transition. Then the workpiece ejector 13 is removed from the die holes 9 and transferred to the third position of the press, where a draft of conical form 14 (Fig. 1G and Fig.4) 15 and cylindrical sections of the rod and make final stamping of the spherical head 16. After this, the workpiece using the ejector 17 is removed from the matrix 18 and transferred to the fourth position in the press, where in the matrix 19 (Fig. 1D) perform the final reduction section 20 under the knurling thread, and the ejector 21 remove the product from the matrix 19.

Thus, the inventive method allows for the reduction of the height of stamping on the first and second transitions of sites to ensure the deformation of workpieces without curving the longitudinal axis, which improves product quality and process stability. Execution OPA due to a significant reduction efforts pushing.

Example. Ball pin upper hinge front suspension VAZ (item 2101-2904187-70) stamped on the four-press-machine QPBA-161 (firm "Malmedy", Germany) made of steel HIM. From botofogo metal, passed through a properly-specifies the device, cut off the source of the workpiece diameter 16,65 mm and a length of 130 mm On the first transition was reducible section of the rod to the diameter of 15.3 mm and stamped the crown in the form of a cylinder (diameter of 16.8 mm, height 16.5 mm) and two truncated cones with the intermediate barrel-shaped element. The volume of the forged head is 0.75 of the volume of the sphere, the angle of the forming cones1= 5and the diameters d1bases of cones of 20.6 mm, which is 0.6 of the diameter D of a sphere of a finger. On the second transition of the stamp head, identical to the head, is formed on the first transition, but with an angle2slope forming 10oand diameters of d2large grounds of 25.7 mm, which is 0.75 of the diameter D of the sphere finally punched in the head. On the third transition at the same time the draft has formed a core part of the finger in the form of a cylindrical section with a diameter of 17 mm and a conical section with an angle of taper 7oand finally stamped spetrum 12,97 mm under the knurling thread M 141,5. The stamping process proceeded steadily, the curvature of the workpieces on the first and second transitions were observed.

The method of forming a ball pin of a cylindrical workpiece, including a preliminary reduction of the workpiece, the subsequent preliminary landing head for two transitions with simultaneous formation of cylindrical and conical sections, forming the core of the finger slump, the final reduction of the rod under the knurling thread and the final stamping of the spherical head of the finger, wherein the first two transitions preliminary landing head stamp two conical section with the intermediate barrel-shaped element, to which a conical sections abut on large grounds, and on the first transition volume stamping head is set in the range of 0.6 - 0.75 volume of the sphere is ready finger, the diameter of the larger base of its conical sections is equal to about 0.6 - 0.7 of the diameter of the sphere finished finger, and the angle of the forming cones with the longitudinal axis of the workpiece is equal to 5 to 9oon the second transition volume stamping head is set in the range of 0.8 - 0.9 volume of the sphere is ready fingers, the diameter of the larger base of its conical sections pinoy axis - 10 - 15oand the final reduction of the rod under the knurling thread carried out after forming the spherical head.

 

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