The method of hot die forging billet housing tie rod

 

The invention relates to the processing of metals by pressure and can be used in hot forging billet housings tie rods. Produce heat stamping area of the original piece, pre-punching head for three transition with grip in polimetrica and final stamping head in the form of a Cup with a transition area to the terminal, which has an oval cross-section. On the first and second transitions of the pre-punching to form a head in the form of two cones connected by large grounds. The diameter of the bases of 1,21,4 the diameter of the original piece, obtained at the first transition, and 1.71,9 the diameter of the original piece for the head obtained at the second transition. The height of each cone is 1.82,0 the diameter of the original piece for the head obtained at the first transition, and 1.61,7 the diameter of the original piece for the head obtained at the second transition. On the third transition pre-punching to form a spherical head with a transition area veroobrazno shape with a radius of 0.3of 0.4 of the diameter of the original saute ensures the stability of the stamping process, reduce scrap and metal saving. 1 Il.

The invention relates to the processing of metals by pressure and can be used in hot forging billet housings tie rods.

A known method of manufacturing a billet housings tie rods, comprising heating the workpiece, the cross-klinovuyu rolling of the workpiece with the formation of a core section and a spherical head, which is carried out in special mills cross-wedge rolling, and hot stamping head in the form of a Cup presses (Shchukin C. J., Kozhevnikov, Century, Rudovich A. O. New in the cross-wedge rolling / Forging and stamping production, 1999, No. 3, S. 35-37). Low quality of the workpieces after cross-wedge rolling, especially in areas along the axis that is experiencing tensile stresses, leading to the formation of cracks and voids, is a significant disadvantage of the known technical solutions. Another disadvantage is that the process is carried out on the lines, including the mill cross-wedge rolling and press, which together occupy valuable floor space.

The closest to the technical nature of the claimed object is a method of hot stamping zag the I. L. Forging and stamping production of the Volga automobile plant. - M.: Mashinostroenie, 1977, S. 108, Fig.41). In accordance with the known method on the first transition are forming a conical head with a large base, adjacent to the rod, the diameter of which is (1,51,6) d0and height (56) d0where d0the diameter of the original piece. On the second transition stamp conical head, the height of which (34) d0and the larger diameter base (1,92,0) d0. Stamped on the first and second transitions conical heads have a volume equal to the volume of the head billet tie rod with fin and an allowance for machining. On the third transition are stamping the spherical head with the transitional conical section to the terminal. Before submitting to the fourth position stamping the workpiece rotate in a vertical plane 90. On the fourth move permanently stamp the blank body of the tie rod, forming the head of the handpiece in the form of a Cup and part of the transition to the rod with an oval cross-section.

A disadvantage of the known technical restivo on the first and second transitions. Causes buckling are, first, aperpendicular end of the original piece longitudinal axis, which is sure to a certain extent occurs when a segment of the blanks from the rod, secondly, the larger the relative height of the stamping area (56 diameters of the original piece), as the volume of stamping stations by known techniques practically equal to the volume permanently stamped head. The curvature of the workpieces on the first and second transitions leads to the formation of folds (terminals), failure to complete the punch with one hand and the formation of a Burr on the other in the heads formed on the second transition, which, in turn, causes a decrease in the quality of the products and even the formation of marriage. Another disadvantage of the known technical solutions associated with increased consumption of metal due to significant Burr, which is formed during the final stamping billet tie rod in the zone of transition from the head to the rod, so as stamping the plot is irrational form and inflated volume.

The basis of the invention the task is to develop a method of manufacturing a billet tie rods, which would ensure the stability of the stamping process, snizeni nuamah plots as well as saving metal by reducing scrap in the zone of transition from the head to the rod by optimizing the shape of the transition area on the third jump.

This is achieved by the fact that in the known method of hot die forging billet tie rods from the cylindrical source procurement, including heat stamping area of the original piece, pre-punching head for three transition with grip in polimetrica and final stamping head in the form of a Cup with a transition area to the terminal, which has an oval cross-section, and the third transition pre-forming head to form a spherical head with a transition area, the first and second transitions of the pre-punching to form a head in the form of two cones connected by large grounds, the diameter of which is 1.21,4 the diameter of the original piece for the head obtained at the first transition, and 1.71,9 the diameter of the original piece for the head obtained at the second transition, and the height of each cone is 1.82,0 the diameter of the original piece for the head obtained at the first transition, and 1.6of 0.4 of the diameter of the original piece, and clamp the workpiece in polimetrica carried out locally at the site, paired with the stamping head.

The invention is illustrated in the drawing, which shows a diagram of the technological process of hot stamping billet housing tie rod.

The method of hot stamping billet housing tie rod as follows. A cylindrical workpiece, cut off from the rod or botofogo metal press-scissors, placed in the inductor, where heat build preparation section. Special ticks-emphasis billet grab for nongravity the site and placed on the position of the first passage forming horizontal forging machines (GCF), where the lateral movement of the slide clamp in polimetrica at site 1, and when the movement of the main working of the slide stamp head in the form of two cones 2, paired on large grounds, the diameter of which is (1,21,4) d0and the height of each cone (1,82,0) d0. The volume of stamping area of the workpiece is (0,550,65) of the volume finally punched in the head and upper Grand is the first slide of the semi-finished product is exempt from stamp and with the help of ticks focus is moved to the second position GCF, where is the second preliminary stamping head in the form of two connected across a larger base of the cone 3. While the workpiece is clamped by pilomatricoma on site 4. Stamped cone has a height (1,61,7) d0and the diameter of the large base (1,71,9) d0and total volume of cones is (0,750,85) on the volume permanently stamped head. On the third transition of the workpiece clamped in polimetrica at site 5 and punched a spherical head 6 with toroidal section 7, the radius of which is 0.30.4 diameter of the original piece. On the fourth transition make final punching head 8 in the form of a Cup with a transition area 9 to the terminal oval cross-section.

Thus, the application of the proposed method allows for the reduction of the height of stamping on the first and second transitions plots, and local grip to make it without deformation of the curvature of the longitudinal axis, which improves product quality and process stability. Stamping on the third position of the spherical head with toroidal transition to the core with a radius equal to src="https://img.russianpatents.com/chr/247.gif">6% reduces the flow of metal through the use of blanks of smaller length.

Example. The workpiece housing thrust steering system of automobiles VAZ (item 2101-3003057) stamped on horizontal forging machine model BB-1134 (plant TKO, ,Ryazan) steel 40. The original billet with a diameter of d0=18 mm and length l0=215 mm cut from a rod of metal at the press-scissors. Plot billet length 160...170 mm was heated in the coil to a temperature of 1050-1150C. At the first position GCF stamp head in the form of a double cone with the larger diameter of the base of the D1=24 mm and a height of H1=34,5 mm At the second transition stamped crown in the form of two cones whose diameters large grounds D2=32 mm, and the height of each cone H2=31 mm At the third transition stamped spherical head with a sphere radius R=20 mm and toroidal transition area of the rod with radius r=7,5 mm Before stamping blanks on the first, second and third passages she clamped by pilomatricoma for the area adjacent to the stamping head. On the fourth transition perform the final shaping of the body of the tie rod with the formation of the head in the form of a Cup and a transition area to the terminal oval Poperechnaya folds and unilateral Burr was not observed. I finally stamped billet overflow in the zone of transition from the head to the shaft is minimal.

Claims

The method of hot die forging billet housing tie rod from the cylindrical source procurement, including heat stamping area of the original piece, pre-punching head for three transition with grip in polimetrica and final stamping head in the form of a Cup with a transition area to the terminal, which has an oval cross-section, while the third transition pre-forming head to form a spherical head with a transition area, wherein the first and second transitions of the pre-punching to form a head in the form of two cones connected by large grounds, the diameter of which is 1.21,4 the diameter of the original piece for the head obtained at the first transition, and 1.71,9 the diameter of the original piece for the head obtained at the second transition, and the height of each cone is 1.82,0 the diameter of the original piece for the head obtained at the first transition, and 1.61,7 from timeeverything stamping form a toroidal shape with a radius 0.3of 0.4 of the diameter of the original piece, and clamp the workpiece in polimetrica carried out locally at the site, paired with the stamping head.

 

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