Stamp for closed die forging

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used as a stamp for wasteless and low-waste stamping forging. Stamp for closed die forging consists of upper and lower parts. The upper part is made in the form of a punch rectangular cross-section with a restrictive collar. The lower part represents the body from growing up an internal cavity and a self-aligning element. Self-aligning element consists of longitudinal and transverse wedge-shaped strips and provided with sealing elements in the form of longitudinal and transverse strips. In a longitudinal sealing elements mounted sealing knives. Longitudinal wedge-shaped strips self-aligning element is installed with vertical scroll up with the formation of the compensation chamber. The angle of the transverse wedge-shaped strips self-aligning element for 2-3oless friction angle. Sealing elements mounted for sliding on the lateral surfaces of the punch. The inner surface of the sealing elements is made with a slope of 2-3o. In the

The invention relates to the processing of metals by pressure, namely the drop-forging and can be used as a stamp to waste (without overflow) and low-stamping forging with an elongated axis without stamping gradients.

Famous stamp for closed die forging (A. C. the USSR 1602601, B 21 J 13/02. Stamp for closed die forging / A. N. Levanov // Opening. Of the invention. 1990. 40. S. 40) prototype comprising upper and lower plates (top and bottom), and also placed on the bottom plate of the clip from extending to the opposite plate inclined inner cavity. It has placed inside the casing in contact with her self-aligning element composed of mutually perpendicular longitudinal and transverse wedge-shaped bars with the vertical inner surfaces of the relation between a polyline in the plane of the parting line with a straight sealing portion which is made at an angle to the longitudinal direction of the strap, which is determined using the above formula. Longitudinal and transverse wedge-shaped strips are installed with the possibility of a joint limited slip each corresponding inclined surface of the shroud in the direction of increasing the e derived from the conditions of transition strips from the state of locking deformable metal to slide upon reaching the desired degree of filling of the stamp.

Famous stamp (prototype) has the following disadvantages:

a) you must use billet increased accuracy as when using blanks standard accuracy on stamping equipment with rigid kinematics of the Executive body in case of overdose of the metal billet is overloading the machine and stamp, as well as their jamming;

b) in case of overdose of the metal billet is the education side of the Burr between the upper plate and straps;

in complex pair (link) the longitudinal and transverse strips, of which is self-aligning element, the formation of gaps under load and, as a consequence, edge burrs, as well as jamming of the stamp.

The task is to design a stamp for closed die forging, providing savings of metal due to the complete elimination of mechanical Burr, regardless of the accuracy of the dosing volume of the metal of the billets, and precluding jamming of forging machines or the stamp C is covered die forging, containing in the upper part of the punch rectangular cross-section with a restrictive collar, the lower part of the housing with the growing up of the internal cavity, and installing the element, consisting of longitudinal and transverse wedge-shaped strips, sealing elements, the sealing knives, is achieved by the fact that in the deformation process eliminates the formation of Burr in the coupling plug with tapered straps self-aligning element through the use of sealing elements, the pair of sealing elements and punch - through tightly pressed sealing elements to the punch and incline 2-3oon the inner surface of sealing elements, and the coupling of the longitudinal and transverse wedge-shaped strips self-aligning element, and the pair of sealing elements by using the sealing knives, as well as the fact that at the stage of tostanoski eliminates jamming of the forging machine and stamp due to the fact that the sealing elements have an angle of inclination1not less than twice the friction angle, and due to the formation of the compensation cavity height s between the longitudinal wedge-shaped straps self-aligning alemannische solutions to the prototype shows what is claimed stamp for closed die forging differs from the prototype.

In the prototype, the upper part of the stamp is a flat plate and the plane of the connector stamp perpendicular to the direction of the stroke. Therefore, the interlocking halves of the stamp and its full locking is achieved only at the final stamping. Therefore, under tostanoski possible leakage of excess metal in the gap in the plane of the connector. In the proposed stamp locking cavity is carried out before stage tostanoski due to the tight pressure sealing elements to the punch, longitudinal and transverse wedge slides are self-aligning element on the surface of their contact with the vertical surface of the connector of the stamp.

In the prototype in a complex parting lines, wedge-shaped laths (the plan) provides a straight line segment of a contact made at an angle to the longitudinal direction of the slats, in the proposed stamp contact the longitudinal and transverse wedge-shaped strips self-aligning element is in one transverse plane. In addition, a longitudinal wedge-shaped strips self-aligning sealing element is equipped with knives.

sizes of forgings in the process of lifting wedge-shaped strips, in the proposed stamp compensation excess metal is also due to the formation of the compensation chamber in the lifting wedge-shaped strips self-aligning element.

These distinctive features provide improved quality forgings. Thus, this solution meets the criterion of "novelty".

In Fig. 1 shows a stamp for closed die forging in section and a top view; Fig.2 - stamp for closed die forging in section and side view at the initial deformation; Fig.3 - o knife, mounted on the longitudinal sealing elements of Fig.4 - o knife Assembly with the sealing element of Fig.5 - o knife, mounted on a longitudinal wedge-shaped bars; Fig.6 - o knife Assembly with the wedge bar.

The upper part of the stamp contains the punch rectangular cross-section 1 with the restrictive collar 2, installing the element, consisting of 3 longitudinal and transverse 4 wedge-shaped strips, sealing elements 5, the sealing knives 6 and 7, rod 8, fasteners 9. The lower part of the stamp has a body 10 with an expanding up the internal cavity of the USA 10. When the movement of the punch 1 down 3 longitudinal and transverse wedge 4 trims under the action of its own weight down and fall into the cavity of the housing 10. Upon further movement of the punch 1 down sealing elements 5 rest against the wedge-shaped strips 3 and 4 (Fig.2). Sealing elements 5 are slidable on the plunger in a vertical direction. Moreover, the elements 5, is pressed against the plug by means of spring-loaded fasteners 9, the motion of the punch down 1 are in a state of pressing to a wedge-shaped strips 3 and 4 throughout the deformation process. The surface of the contact pressure elements and wedge-shaped strips is at some angle 1to the vertical, which should be twice the angle of friction, this will help to eliminate jamming in the process of movement of the punch down. The magnitude of the friction angle can be determined by literary reference data (Kragelskii I. C., Vinogradova, I. E. the coefficient of friction. M: Motor Cycle", 1955. 188 C.) or test results of friction by method (derjaguin B. C. What is friction. M.: Izd-vo an SSSR, 1959. S. 243). On the inner surface of the sealing element 5 has a slope of 2-3othat allows you to improve the contact between weidu them. The angle selected 2-3oas the angle is less than 2odoes not provide a reliable contact between the sealing elements 4 and the punch 1, and the angle more than 3ocontributes to increased wear on the contact between them. In the coupling of the longitudinal and transverse sealing elements 5 are sealing knives 6 (Fig.3), excluding the flowing of metal between them. The contact reliability is achieved through the installation of the blades 6 on the longitudinal sealing elements with podpruzhinennom during their contact with the transverse sealing elements and pressure to the contact surface by a deformable material. The blades 6 can be fastened to the sealing elements 5 (Fig.4), for example, by a method of pressing. Sealing elements 5 (Fig. 2) ensure the retention of the wedge-shaped strips 3 at the initial deformation, as in the process of forming the contact surface of the metal with tapered straps 3 possible premature rise up. After touching the plug 1 of the workpiece 11 begins the process of deformation of the workpiece, filling the cavity of the die, the contact of the workpiece with the working surfaces of the wedge-shaped bars 3, 4 and forming the contact surface of the workpiece with the straps. When this pin is undertaken on the longitudinal bars 3 (Fig.6) similar to the knives on the sealing elements 5. In the deformation process of a longitudinal wedge-shaped strips 3 (Fig.1) are in a state of locking of a deformable material, the casing and the sealing elements 5. This phenomenon is explained by the fact that the strap 3 on the one hand act normal voltage e, helps them to rise up (Fig.1), on the other hand on the strap are shear stresses , holding them in their original position (additional retention efforts wedge-shaped strips have sealing elements 5). It is known (contact friction in the processing of metals by pressure / A. N. Levanov, C. L. Kolmogorov, S. P. the Burkin, etc. M.: metallurgy, 1976. 416 C.), the ratio /p voltage plastic friction on the working surface of the strap to the normal stress decreases with increasing stress p as increase the degree of filling of the cavities of the stamp (decrease h) (Fig.1). Therefore, when a given value of h, which should not exceed the radius of rounding of the corners of the drawing, forging, wedge-shaped strips 3 can move from being self-locking in surface contact with a deformable workpiece in a state of slip. When this happens the rise of wedge-shaped strips 3 up to some value of s (Fig.1), DHL is an open-stamping. The value of h depends on the angle of the wedge-shaped bars 3 (angle ), conditions of friction on the contact surfaces of the wedge-shaped strips 3 with a deformable metal and the housing 10, and on the rheological properties of a deformable metal. Therefore, by selecting the appropriate angle and friction conditions at the contact, after tostanoski obtain the required (specified by drawing forgings) dimensions forgings. By the beginning stage of tostanoski sealing elements 5 should advocate punch at distance h if the total harvest maximum. In this case, the end stage tostanoski sealing elements 5 will be on the same level with the punch. During lifting wedge-shaped strips 3 is formed of a compensation cavity between the slats 3 and the bottom part of the inner surface of the housing 10, which can drain the excess metal blanks, which are then cut into the stamp for cutting Burr. Wedge-shaped strips 4 have the angle of 2-3oless friction angle, therefore, do not rise up under the action of stresses R, they serve to facilitate easy removal of the forging die. If the volume of the workpiece is equal to the volume forgings or lower the tolerance, the rise of wedge-shaped strips 3 to occur n the transportation of sealing elements 5 in the initial position, as well as the lifting up of wedge-shaped strips 3 and 4, after the forging is removed from the cavity of the stamp.

1. Stamp for closed die forging, containing the upper part, made in the form of a punch rectangular cross-section with a restrictive collar, the lower part of the body with growing up an internal cavity and a swivel element, consisting of longitudinal and transverse wedge-shaped strips, characterized in that it is provided with sealing elements in the form of longitudinal and transverse strips installed on the side surfaces of the plug and sealing knives mounted in the longitudinal sealing elements and a longitudinal wedge-shaped bars self-aligning element.

2. Stamp on p. 1, characterized in that the longitudinal wedge-shaped strips self-aligning element is installed with vertical scroll up with the formation of the compensation chamber and connected with the transverse wedge-shaped straps self-aligning element on the sides parallel to the cross section of the stamp, and the angle of inclination of the transverse wedge-shaped strips self-aligning element for 2-3oless friction angle.

m surfaces punch in the vertical direction and angle of inclination, greater than the angle of friction of not less than two times, and the inner surface of the sealing elements is made with a slope of 2-3o.

 

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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

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