Stamp for hot stamping crankshaft
The invention relates to the field of forging machinery, particularly to dies for hot die forging of crankshafts. Stamp for hot stamping crankshaft comprises upper and lower die plates, articulated by means of guide elements, and tool inserts made with them in prints, mounted on the die plates. The stamp is supplied with power clamping elements located in the tool inserts. Power elements form a closed retaining surface around the knee necks of the shaft while forming other elements. The result is the reduction of the sizes of the gears during transportation. 2 C.p. f-crystals, 7 Il.
The invention relates to the field of forging machinery, particularly to dies for hot die forging of crankshafts.
Famous stamp for hot stamping of a crankshaft, comprising upper and lower die plates, articulated by means of guide elements, bearing fixed on them instrumental insert made with them in prints. (see, for example, A. N. Bryukhanov, zwesten stamp for stamping forging crankshaft, where procurement of the pre-deformed car arrives at the first position of the stamp and then stamp her shape crankshaft (see, for example, Sementi Century. And., Acaro I. L., Volosov N. N. Advanced technology, equipment and automation of forging and stamping production of KAMAZ. - M.: Mashinostroenie, 1989, S. 227, Fig. 118).
The disadvantage of stamps is that the deformation of the original piece is in the open stamped with the expiration of the metal in the scrap perpendicular to the side surfaces of forgings, which rod in the neck of the crankshaft is formed of an arbitrary orientation of the surface of the fibers, resulting in early wear of the connecting rod journals of the crankshaft during operation.
The closest technical solution of the stamp for hot stamping crankshaft adopted for the prototype, is the technical solution of the stamp, as described in article Kruk A. T. Production of forgings for crankshafts automotive engines. The magazine “die Forging production. Processing of metals by pressure.” No. 12, 2002, S. 7-14. The prototype has the same drawbacks as the analogue, in addition, the main disadvantage of it is that it does not allow use of the tool inserts.
These drawbacks are eliminated by the fact that the stamp is supplied with power clamping elements located in the instrumental inserts, forming a closed retaining surface around the knee necks of the shaft while forming other elements.
In addition, power clamping elements are made detachable from the ring circuit of the knee necks of the shaft and mounted on an elastic force supports.
Comparative analysis with known technical solutions dies for hot stamping crankshaft showed that the proposed stamp provides for holding the workpiece during the finalized surface of the knee necks and the subsequent expiration of the material in the instrumental inserts for preliminary and final stamping, does not allow access to the outside surface of the fibers of the knee roots, and leaves them directed parallel to the axis of the shaft, which significantly increases the strength of the crankshaft, and hence its durability. In addition, the stamp provides deliberately oriented direction of the fibres of the material, as it allows bending of the workpiece at the first position.
The inventive stamp is illustrated by drawings, where Fig.1 is a view of an artillery shell exploded aimmah elements prior to the deformation of the metal; Fig.4 - section b-B bending inserts; Fig.5 is a cross - section In bending inserts along the longitudinal axis of the crankshaft; Fig.6 - section G-G inserts to volumetric strain; Fig.7 - cross section d-D die inserts (Fig.1).
Stamp for hot stamping crankshaft contains the lower die plate 1, the upper die plate 2, the guide elements 3 and 4, is made in the form of columns and bushings, base plates 5 and 6 to install the tool inserts 7, 8 - for flexible billet crankshaft, 9, 10 for pre - deformation and 11, 12 for the final deformation. Instrumental insert 7, 8, 9, 10, 11, 12 equipped with power clamping elements 13, 14, 15, 16, 17, 18, carrying out ring closure knee necks 19, 20, 21, 22 of the crankshaft, not allowing radial expiration material knee necks. When this power clamping elements 13 for bending the insertion of the stamp and 15, 17 for deforming tool inserts are fixed, and the power elements 14 for bending the insertion and 16, 18 for deforming tool inserts are movable supported on the supporting elastic force elements 23, 24, 25. The stamp is equipped with ejectors 26, 27, 28, lifting the workpiece on the level mirrors stamp.
Stamp hot on the size of the diameters of the connecting rod journals is placed on the protruding lower fixed power elements 13 bending tool insert 7 laminated knee tails 19, 20, 21, 22. Turn the press and the slide (Fig. not shown) secured on the upper half of the punch moves down. During the course of the slide down the top power clamping elements reach the bottom of the power clamping elements, imposed their end surfaces to each other, forming a tightly closed ring around the knee-necks 19, 20, 21, 22 of the crankshaft, as shown in Fig.3. Under the influence on the one hand the efforts of the press, and on the other counter supporting force of the elastic elements 23 creates a closure force of the clamping elements. Upon further movement of the slide and the upper half of the stamp down is flexible billet crankshaft, but closed annular forming surface around the knee-necks 19, 20, 21, 22 do not allow radial expiry of the material. Having extreme lower position of the slide (Fig. not shown) is returned to its extreme upper position. Stamp and tool box 7, 8 open open power clamping elements 13, 14, releasing the workpiece. Next, the workpiece is shifted to the instrumental insert 9, 10 pre, then 11, 12 for final stamping. This procurement as well as in bending, are placed on the lower power elementami 16, 18, forming around the knee-necks 19, 20, 21, 22 closed annular cavity, not allowing radial flow of metal. The material of the workpiece located between the knee tails, deformed instrumental inserts 9, 10, 11, 12, filling the cavity of the stream and forming the other elements of crankshaft forgings. After lifting of the press slide ejectors 26, 27, 28 raise the forging at the level of the mirror die inserts. Force clamping force clamping elements 13, 14, 15, 16, 17, 18 is determined by the force of the elastic support force elements, above which on the operations of the task force deformation, elastic support force elements 23, 24, 25 subside within the path of deformation, not allowing power clamping elements as to be opened and to deform the material of the knee necks.
Thus, the inventive stamp provides power circuit obtained by the method of rolling and other methods billet crankshafts by keeping them behind the knee of the cervix in the tool does not allow arbitrary direction of the surface fibers of the knee necks when forming other portions of the crankshaft and thereby provides increased strength and durability of the crankshaft is containing a series of upper and lower die plates, articulated by means of guide elements, and tool inserts made with them in prints, mounted on the die plates, characterized in that it is equipped with power clamping elements located in the instrumental inserts, forming a closed retaining surface around the knee necks of the shaft while forming other elements.
2. Stamp on p. 1, characterized in that the power clamping elements are made detachable from the ring circuit of the knee necks of the shaft.
3. Stamp on p. 1, characterized in that the power clamping elements mounted on elastic supports.
FIELD: metal working.
SUBSTANCE: hard alloy matrix has casing, bushing pressed in the case and hard alloy insertion. Bushing has multifaced hole. Hard alloy insertion is composed by several sections made in form of trapezoidal-section prisms which have cut angles at their non-working edges. Number of sections corresponds to number of faces of item to be headed. Cuts of angles are made symmetrically to faces of working edge. Slits are made in several places of multifaced hole bushing at the ponts where faces cross each other.
EFFECT: improved resistance of matrix; simplified assembly.
3 cl, 1 dwg
FIELD: forging and forming processes and equipment, namely manufacture of elongated forgings with thickened portions and lateral branches.
SUBSTANCE: die set includes deforming punch, die with vertical parting, struts in the form of truncated pyramids having wedge-shaped slopes for mounting die; units for securing struts to supporting plate. Die is placed in struts with possibility of motion relative to them. Struts have double-sided mutually opposite slopes. Elastic member is placed under die. Maximum compression value of said elastic member by means of effort corresponding to effort of clamping die halves in struts is equal to value of descending die at forging process.
EFFECT: enhanced reliability and rigidity of die set.
2 cl, 1 dwg, 1 ex
FIELD: plastic working of metals, possibly operations for finish working of forgings of double-end box nut wrenches.
SUBSTANCE: die set includes upper and lower plates with guiding columns, punch for punching operation mounted on upper plate, stripper, lower die for punching, half-open trimming lower die and trimming punch. Trimming lower die is mounted on upper plate; it has cutting edge and cavity arranged behind collar of cutting edge and designed for freely placing forging of nut wrench. Trimming punch is mounted on lower plate and it has embracing supporting surface for fixing forging at trimming and straightening operations.
EFFECT: enhanced quality of forging.
9 dwg, 1 ex
FIELD: plastic working of metals with use of intensive plastic deformation, production of nano-crystalline materials with improved mechanical properties.
SUBSTANCE: die set includes band in which cone insert having several parts is pressed; lower support; inlet and outlet ducts; ram. According to first variant of invention contours of parts of cone insert are restricted by means of two mutually normal planes and cone surface portion cut by said planes. Crossing line of said planes does not coincide with symmetry axis of cone surface. Inlet duct is formed by faces of cone insert parts arranged normally one relative to other and mutually joined; walls of said duct are in the form of portions of said planes. According to second variant of invention contours of cone insert parts are restricted by radius surface, by two mutually crossing planes and portion of cone surface cut by said planes. Crossing planes are mutually normal or they are inclined one relative to other by angle 120°. Axis of radius surface coincides with crossing line of said planes. Faces of cone insert parts are mutually joined; inlet duct is formed by their radius surfaces and outlet duct is formed by radius grooves.
EFFECT: lowered number of parts, reduced consumption of material for making cone insert.
4 cl, 10 dwg
FIELD: plastic working of meals, possibly manufacture of hollow parts such as sleeves, tubes, bushes by cold pressing out.
SUBSTANCE: method comprises steps of plastic deforming of blank at translation and rotation of deforming tool; realizing said motions of tool from separate drive units; setting speed of translation less than that of rotation and selecting relation of said speed values less than 2.5.
EFFECT: enhanced manufacturing possibilities of method.
2 cl, 2 dwg, 2 ex
FIELD: plastic working of metals, namely processes for pressing out shapes of aluminum base alloys, constructions of pressing out tools.
SUBSTANCE: method comprises steps of making blank, heating, hot pressing out of blank through die, heat treatment of shape. At pressing out blank is subjected in upper p[art of die to additional shearing deformations due to twisting it by angle in range 40 - 50° relative to axis of die. Die includes deforming cone, working rectangular collar and outlet zone. Deforming cone has two helical protrusions in the form of trapezium. Upper base of said trapezium is equal to length of rectangle of working collar; its lower base consists 1.5 - 2 of parts of said length value. Rotation angle of upper cross section of protrusion relative to its lower cross section is in range 40 - 50° relative to axis of die. In longitudinal cross section said protrusions are in the form of parabola.
EFFECT: possibility for making rectangular aluminum alloy shapes with enhanced mechanical characteristics and low anisotropy of their properties, improved design of die.
2 cl, 4 dwg, 1 ex, 1 tbl
FIELD: plastic working of metals, possibly forging ingots and billets in hydraulic forging presses.
SUBSTANCE: apparatus includes two holders of upper and lower strikers having inclined surfaces. Said holders are kinematically coupled with two holders of lateral strikers having inclined surfaces corresponding to those of holders of upper and lower strikers. Four strikers are secured to respective holders by means of clamps and tightening studs. Each of upper and lower strikers has two working portions mutually divided by cutout. Each of lateral strikers has one working portion entering cutouts of upper and lower strikers. At least one adjusting plate is placed between holder of lower striker and lower striker. Lower striker is secured to its holder by means of two Г-shaped clamps. Inclined surfaces of said clamps are forced to inclined surfaces of holder of lower striker; riffled surfaces of said clamps are forced to two friction plates arranged on lateral surfaces of lower striker. Pins passing through openings of adjustment plates and entering openings of holder of lower striker are mounted in lower striker.
EFFECT: lowered cost of making tool, reduced time period for readjustment of it.
2 cl, 5 dwg
FIELD: plastic working of metal, possibly in forging shops of metallurgical and machine engineering plants for making wheels of automobiles and similar articles.
SUBSTANCE: tool includes die, punch, knocking out member with shaped portion, unit for stepped regulation of bottom thickness and height of cup. Said unit is in the form of apparatuses for changing length of punch and depth of die. In upper part of punch female type yoke with through stepped opening is mounted. In upper part of die there is seat whose diameter dimension corresponds to outer diameter of yoke. Depth of die is changed by means of apparatus in the form of flat ring arranged over shaped portion of knocking out member. Apparatus for changing length of punch is in the form of flat round gasket arranged inside yoke over punch. Punch has in its upper portion large-diameter step corresponding to diameter of large step of yoke opening.
EFFECT: possibility for producing by means of one tool semi-finished products of wheels with different combinations of width and thickness values.
3 cl, 3 dwg