Patent Publication Number: US-3875785-A

Title: Die for sizing rolled sections

Description:
United States Patent Anisimov et al.  
 DIE FOR SIZING ROLLED SECTIONS Inventors: Albert Viktorovich Anisimov,  
 Filed:  
 Mytischi. Novo-Mytischinsky Prospekt. 23/7, kv. I02. Moskovskaya Oblast. Mytischi&#39;. Nikolai Trifonovich Deordiev, ulitsa Fridrikha Engelsa, 42. kv. 40. Voronezh; Mikhail Zinovievich Ermanok, ulitsa Partizanskaya. 47. kv. l8. Moscow; Ivan Vasilievich Kononov, ulitsa Torpedo. 40, kv. 4. Voronezh; Vasily Sergeevich Kurbatov, ulitsa Tolbukhina, 8. Korpus 2. kv. 14. Moscow; Ivan Egorovieh Maslennikov, ulitsa Druz hinnikov. 26. kv. 82; Vladimir Nikiforovich Platonov, ulitsu 9 Yanvarya. 49, kv. 45. both of Voronezh; Viktor Ivanovich Ustinov, ulitsa Tolbukhina, 8. kv. 65. Moscow. all of USSR.  
 July [3, I973 App]. No.: 378.979  
 .15. Cl. 72/340; 72/464; 83/914 Int. Cl 821d 28/00 Primary E.\&#39;uminerC. W. Lanham Assistant E.t&#39;aminer.lames R. Duzan Attorney. Agent, or Firm-Waters. Roditi. Schwartz &amp; Nissen [57] ABSTRACT A die comprises plates moving towards each other in which portions of the female die are locatedv Fastened on the plates right behind the respective portion of the female die in the direction of movement of the article are knives to trim the base of the article on its lateral sides.  
 The installation of knives makes it possible to obtain the profile of the article for one pass with a preset accuracy of its geometrical dimensions.  
 2 Claims, 5 Drawing Figures DIE FOR SIZING ROLLED SECTIONS The present invention relates to plastic working of metals and. more particularly. to dies for sizing rolled sections.  
  It is most expedient that the die for sizing rolled sections. according to the present invention be installed on pulsating-load hydraulic presses. and be used for reducing and sizing rolled sections of various shapes from aluminium. steel. titanium and other alloys.  
  Known in the prior art is a die. comprising an upper and a lower plates moving towards each other. These plates are provided with slots for the split female die adapted to reduce and size rectangular pipes.  
  However. the prior-art die cannot be employed for sizing T-sections and providing articles of required quality. this being due to the fact that the flanges of the blanks have practically always different thicknesses and tolerances thereof. therefore. while sizing the rolled sections, each flange is stamped by applying with a different reducing coefficierrt, thereby entailing a prohibitive curvature in the articles, cracks and breakages.  
  To reduce and size T-sections which are hot-drawn through solid female dies. use is generally made at present of drawing mills.  
  It is irrational to stretch sections in these female dies for the reasons of:  
  a. low reducing coefficient (0.2-0.3 mm per pass for titanium-alloy sections);  
  b. increased deviations from nominal size of the finished article;  
 c. low tool durability;  
  d. difficulties in obtaining articles with flanges less than 1.00 mm thick;  
  e. necessity of finishing articles after the drawing operation.  
  An object ofthe present invention is to provide a die for sizing rolled sections which enables the sizing of rolled sections simultaneously with trimming their lateral sides to preset dimensions. thus making it possible to obtain the article for one pass with a required accuracy in the geometrical dimensions.  
  Another object of the present invention is to provide an increase in labour productivity.  
  A die has been proposed in accordance with the mentioned and other objects.  
  For attaining this object. the die for sizing rolled sections. comprising two plates moving towards each other and accommodating the female die whose impressions are somewhat larger than the dimensions of the finished article. incorporates, according to the invention, two pairs of knives for trimming. while sizing. the lateral sides of the article base in the direction parallel to its movement. for which purpose the first knives of each said pair are fastened to one of said plates right behind the respective portion of the female die and the other knives ofthese pairs facing the first ones. are fastened to the opposite plate. with the cutting angle of each pair of knives not exceeding the approach angle of the female die.  
  lfit is necessary to trim also the flange normal to the base, it is expedient that the plate accommodating the portion of the female die with the impression for the flange normal to the base. be used for installing right behind this portion of the female die at a distance equal to the height of the flange, a pair of additional knives for trimming the end of this flange in the direction parallel to its movement having a cutting angle not exceeding the approach angle of the female die. with one of the knives being connected through a wedge to the other plate for imparting movement to this knife in the direction perpendicular to the direction of the plate movement.  
  A die for sizing rolled sections. according to the present invention, makes it possible to trim the lateral sides of the section. once it has come outside the zone of the sizing die and impart the dimensions of the finished article thereto. In so doing. the sizing can be accomplished both in the cold and hot state.  
  The smith forging of the sections simultaneously with the trimming of the lateral sides thereof entails a maximum reducing coefficient (in the range of plastic deformation). an accuracy in geometrical dimensions. improved labour productivity and the possibility of sizing thin-webbed sections.  
  A specific embodiment of the present invention is given below with reference to the accompanying drawings, wherein:  
  FIG. I is a diagrammatic view of a hydraulic press with a die for sizing rolled sections installed thereon. according to the invention.  
  FIG. 2 is an enlarged scale cross-sectional view, taken on the line II-ll of FIG. 1.  
  FIG. 3 is a cross-sectional view. taken on the line III- III of FIG. 2.  
  FIG. 4 is a cross-sectional view taken on the line lV-IV of FIG. 2.  
  FIG. 5 is a cross-sectional view taken on the line V-V of FIG. 2.  
  The hydraulic press incorporates a frame 1 (FIG. 1) with a cylinder 2 located therein. The cylinder accommodates a piston 3 designed to perform reciprocating motion due to the pressure variation of the fluid in an above-piston cavity 4 and the constant pressure in a below-piston cavity 5.  
  The above-piston cavity 4 is communicated with a high-pressure manifold 6 and a pump 7 for the piston 3 to perform working stroke. and it is connected with a fluid-drain manifold 9 through pulsator 8 for pressure relief from the piston 3.  
  For the piston 3 to return to the initial position the below-piston cavity 5 is communicated through a check valve 10 to the high-pressure manifold 6. A bolster II is fastened to the frame 1. with a die 12 for sizing rolled sections being installed between the bolster II and the piston 3.  
  The die comprises a lower plate 13 connected to the piston 3 in order to impart reciprocating motion to the plate 13, and an upper plate 14 fastened to the bolster II.  
  The said plates accommodate a female die 15 (FIGS. 2. 3) adapted to size (stamp) T-sections. The female die consists of portions l6, l7 and 18 which have an approach angle a. The portions 16 and 17 of the female die 15 are installed on the upper plate 14, and the portion 18 on the lower plate 13.  
  To ensure a free sideways flow of the metal in the process of stamping a rolled section. the dimensions of the effective opening on the lateral sides are made larger than the dimensions of the finished article.  
  Located on the plates 13 and 14 right behind the sizing female die 15 are two pairs 19 (FIG. 4) and 20 of knives used to trim the base of the section. once it has come outside the zone of the sizing female die and an additional pair of knives 21 designed to trim the flange normal to the base of the section and installed at a distance equal to the height of the flange.  
  The pairs 19 and 20 of the knives contain knives 22 and 23 respectively fastened to the upper plate 14 and knives 24 and 25 fastened to the lower plate 13 opposite the former ones. A pair of additional knives 21 is installed in the upper plate 14 and is comprised of a movable knife 26 and a knife 27 rigidly fastened to the knife 22. To actuate the knife 26, it is connected to a wedge 28 interacting with the plates 13 and 14. All the pairs of knives have cutting angles [3 which are equal to or smaller than the approach angles B of the sizing female die 15.  
  To unobstructedly dispose of trimming the scrap from the area ofthe die 12, the said pairs of knives contain outlet grooves 29, 30. 31.  
  The die for sizing rolled sections. according to the present invention. operates in the following manner.  
  The pump 7 is acutated to supply fluid to the highpressure manifold 6 and then to the above-piston cavity 4 and through the check valve 10 to the below-piston cavity 5.  
 The highpressure manifold 6 and the abovepiston cavity 4 get periodically communicated through the pulsator 8 with the fluid-draining manifold 9.  
  On supplying fluid to the above-piston cavity 4, the piston 3 performs a working stroke. and when the said cavity is communicated with the fluid-draining manifold 9. the piston 3 returns to the initial position due to the action of the elastically-compressed fluid in the belowpiston cavity 5 held constantly by the check valve [0. Owing to this. the piston 3 together with the plate 13 fastened thereon reciprocates at a frequency of a few cycles per second. Concurrently, the portions l6. l7 and 18 of the female die 15 and the knives 22, 23 and 26 oscillate at the same frequency. The remaining knives 24. 2S and 27 are stationary fastened to the upper plate 14. The knife 26 is moved by the wedge 28 whose one plane interacts with the lower plate 13, and the other plane with the upper plate 14.  
  The blank (not shown in the drawing) is fed along the die 12 and is forged in the female die until it acquires the dimensions of a finished article. The metal flows at the moment of sizing (forging) both in the direction of feed and sideways. thus filling up the impressions in the female die 15 which have larger dimensions than those of the finished article. Owing to this. blanks with increased deviations in the flange thickness can be sub jected to sizing. The more intensively the surplus of meta] moves sideways. the larger the deviations of the flange thickness from the nominal size. Therefore. unlike the sizing of rolled sections. on. say. drawing mills.  
  4 their stamping in the present die 12 on a pulsating-load press can be accomplished with a different reducing coefficient for each flange, thereby increasing considerably the fitness of blanks and improving labour productivity.  
  On leaving the sizing female die 15, the lateral sides of the section are trimmed by the pairs of knives 19, 20 and 2! to the dimensions of a finished article in the di rection parallel to the movement of the article. As this takes place. the scrap proceeds along the grooves 29, 30 and 31 to the outlet. To ensure a free advance ofthe blank in the direction of supply. the cutting angles B are made equal to or smaller than the approach angles a of the sizing female die 15.  
  Thus. the die 12 provides for the obtaining of highquality finished articles with respect to the structure of the material. accuracy and surface finish. so that further treatment boils down to the final operation of straightening on a stretching machine.  
  A die. according to the present invention has been tested by installing it on a pilot prototype ofa pulsatingload hydraulic press developing a tonnage of 3 l5 tf for sizing rolled sections from titanium alloys.  
 We claim:  
  1. A die for sizing roller sections formed from a blank having a base and flange portions. comprising: two plates installed movably towards each other&#39;.a female die whose impressions are somewhat larger than the finished article. consisting of individual portions correspondingly located in said plates; two pair of knives for trimming the lateral sides of the base of said article while sizing it in the direction parallel to its movement. the first knives ofthe said pair being fastened to one of said plates right behind the respective portions of said female die in the directin of movement of the said article. and the remaining knives of said pair facing the first ones being fastened to the opposite plate. with the cutting angle of each pair of knives not exceeding the approach angle of the said female die.  
  2. A die as set forth in claim 1, wherein a pair of additional knives is mounted on the plate accommodating a portion ofa female die with impressions for the flange normal to the base of the article. the said knives being located right this portion in the direction of the movement of the article at a distance equal to the height of the end of this flange and being used for trimming the end of this flange in the direction parallel to its move ment. having a cutting angle not exceeding the approach angle of the female die. with one of the knives being connected through a wedge to the other plate, in order to impart movement to this knife in the direction perpendicular to the direction of the plate movement. l