Die set for closed forging

FIELD: plastic working of metals, possibly designing of technological tools for waste-free and slope-free forging of blanks such as bodies of revolution.

SUBSTANCE: die set includes upper and lower portions. Upper portion has body, insert, punch and self-aligning yoke suspended to punch by means of tie rods. Lower portion includes body, insert and knocking out member. Insert of lower portion is built-up one. It has stationary insert with cone cavity, movable insert-yoke joined with stationary insert along outer surface and having inner cylindrical surface; and insert-bottom. Joined surfaces of stationary insert and movable insert-yoke are formed with joining angle exceeding self-braking angle. On inner surface of movable insert-yoke shoulder is formed for supporting insert-bottom. Diameter of lower base of cone cavity of stationary insert is less than diameter of lower base of outer surface of movable insert-yoke by value determined according to given condition.

EFFECT: enhanced efficiency of forging process, improved accuracy of forged blanks, enhanced repairing capability of die set due to possibility for changing worn members.

3 cl, 3 dwg

 

The invention relates to the processing of metals by pressure, namely the hot bulk forming, and can be used as a stamp to waste (bezoblachnoy) and besuconas (without external stamping slope) stamping forging formed by bodies of revolution.

It is known that the use of die forging justified in serial and mass production. When using this method significantly increases productivity, reduces waste of metal, are provided with a high accuracy of shape and surface quality. These advantages are most fully realized when forging in closed dies. In addition to decreasing the amount of metal due to the absence of overflow, forgings have a more favorable structure, as well as fibers flow round the circuit forgings, and not pererezaetsya in place out of the metal in the scrap. The metal is deformed in the conditions of a comprehensive uniform compression for large compressive stresses, it allows to obtain a large degree of deformation and to stamp maloplastichnye alloys.

Stamping can be performed depending on the required accuracy, weight and complexity with various allowances, inlets and tolerances.

To forge the inlets include: overlap on impossible elements, stamping gradients, inner radii of curvature, jumpers hole.

Stanova the major grades are assigned in excess of the allowance, they increase the flow of metal during machining and weight forgings (Hot forging. Fighters CENTURIES, Trofimov, I. - M.: Higher school, 1982, s-203).

All allowances and overlaps appointed to the item, as a rule, have a mass comparable to the mass of the parts and removed by machining. Therefore, the reduction of mass stamping by eliminating any overlap is an important task.

Famous stamp for closed die forging (A.S. No. 565768, B 21 J 13/02. Private stamp / Antivenom, Weekendi and You) prototype, consisting of a lower part composed of the corps, strip and insert, and the upper part made of paste, trims and housings, as well as a self-extracting clips, fastened with tie rods at the top of the stamp, and in the process of deformation pressed against the lower part of the stamp with spring shock absorbers.

Famous stamp (prototype) has the following disadvantages:

- presence on the inner side surface of the lower insertion force gradient, which generates a similar emphasis on forging received this stamp: the increase in weight of forgings forgings;

- the presence of the spring shock absorbers, which during operation of the stamp will lose their elastic properties, i.e. will decrease the pressing force of the self-cage to lower the stamp, hence, extracting the clip may rise earlier than the deformed metal will fill the whole cavity of the stamp: the instability of the process.

The task to be solved by the invention is the manufacture of forgings without stamping gradients along the outer side surface, improving the accuracy and stability of the geometrical sizes of forgings, excluding them jamming in the stamp, increase maintainability and service life of the tool.

Technical result achieved in the implementation of the present invention is as follows:

- saving stamped metal by increasing the accuracy of forming the side surfaces of forgings: exception they stamping grades;

- improving the performance of the stamping process by eliminating time remove forgings, as well as the ease of extraction of forgings from stamp;

- improving the maintainability of the tool due to quick and cheap replacement for a failed element of the stamp.

This technical result is achieved by the fact that in the proposed stamp for closed die forging contains in the upper part of the housing, insert, punch and samostirayuschuyusya clip hanging from a punch with tie rods, and at the bottom of the enclosure, insert and wytaliba the spruce, characterized in that the lower inset team and consists of a fixed insert the tapered cavity, which is associated with the outer surface of the movable insert-holder having a cylindrical internal surface and insert the bottom, the angle of their mates made more angle-locking, in addition, on the inner surface of the movable insert-holder made the rib, which set box-bottom.

It is advisable that the diameter of the bottom of the internal cavity of the fixed insert was made smaller than the diameter of the bottom outer surface of the movable insert-clip on the value ΔD, which can be determined from the conditions:

where ΔD - the difference between the diameter of the bottom outer surface of the movable insert-holder and a diameter of the bottom of the internal cavity of the fixed insert, mm;

σSIMP.- the limit of elasticity, MPa;

E - the modulus of elasticity, MPa;

D is the diameter of the inner cylindrical surface of the movable insert-holder, mm;

It is advisable that the outer diameter of the insert bottom was made smaller than the diameter of the cylindrical surface of the movable insert-clip on the value ΔD.

The invention is illustrated by drawings, where figure 1 shows a General view of the die for closed forging section when fully see the caña parts of the stamp; figure 2 shows the mutual position of elements of the stamp at the moment of contact of the workpiece by the upper stamp (left) and closing the cavity stamp (right); figure 3 shows the degree of filling of the metal cavity stamp with the deformation of the original piece with nominal sizes (left) and deformation of the original piece with sizes in the plus tolerance zone (right).

Die for closed forging consists of (see figure 1):

the lower part comprising a housing 1, a fixed box 2 with growing up an internal cavity, a movable insert-clip 3 with the tapered outer cylindrical inner surface, the insert bottom 4, lying on the inner annular protrusion of the movable insert-holder 3, the washer 5 is fixed to the fixed box 2 by means of bolts 6 and the ejector 12;

upper parts, including the housing 7, box 8, the punch 9, extracting the clip 10, is suspended from the punch 9 with tie rods 11. Between the diameters of the bases of the movable insert-holder 3 and the fixed insert 2 in the initial position there is a difference ΔD (or one-sided gap δ). Between the movable insert the ferrule 3 and the fixed box 2 in the initial position (no load) is formed by the height of the gap h (figure 1) by the difference in diameters ΔD their bases. Between the side surfaces of the movable insert-holder 3 and insert the bottom 4 in the IP is the same position (without load) provided the diameter of the gap δ due to the difference in their diameters.

Stamp works as follows. Heated source of the workpiece 13 is loaded into the working cavity of the lower stamp formed movable insert the ferrule 3 and the insert bottom 4. During the course of the bar press down (2), the plunger 9 is moved down and in contact with the workpiece 13 passes through it, the force of the press on the bottom of the working cavity 4, which is due annular collar begins to move down the movable insert-clip 3 to hard contact with the fixed box 2 (the gap h is selected). Mobile-insert-clip 3 moving down, elastically compressed in the radial direction to the choice of the gap h and choose backlash δ. All gaps are selected before touching the deformed workpiece 13-side surface of the movable insert-holder 3. The transmitted force from the press securely holds the insert bottom 4 and the sliding insertion of the ferrule 3 is pressed to the fixed box 2 on the entire cycle of deformation of the workpiece.

In the upper part of the stamp: drop-down clip 10 moves down and closes the working cavity of the stamp before touching the deformed workpiece 13-side surface of the working cavity of the movable insert-holder 3. The initial pressing of the self-expanding cage 10 to the lower stamp is provided by the weight of the cage 10.

p> In the next moment the movement of the bar press down the plunger 9 is embedded in the workpiece 13 and begins the process of deformation occurring in conventional closed die. If the workpiece has a size in the plus tolerance zone, then after filling all prints stamp begins stage tostanoski. An exclusion of excess metal from the cavity of the die, resulting in a self-extracting ferrule 10 under the action of the vertical components of the pressure of the displaced metal on the inner inclined surface rises. In this case, the circuit forgings forgings formed compensatory cavity of height Hnlike samsennai the open groove of the stamp (figure 3). If the workpiece has dimensions nominal or minus tolerance zone, stage tostanoski missing and extracting the clip 10 does not rise.

At the end of the deformation process of the upper stamp is raised to its original position. The ejector 12 raises the finished stamping up. After removal of the load movable insert-clip 3 slides freely its outer conical surface the conical surface of the fixed insert 2 up and elastically expands in the radial direction (the gaps h and δ restored), forming the space required to remove the forming cavity of the die. Free upgrade movably the insert-holder 3 is achieved by the angle of the conical surface to the direction of load application, which must be greater angle locking (steel α≈13-16°). Ready stamping can be easily recovered. In the engraving of the stamp placed a new piece. Then the ejector 12 is lowered down. The stamp is ready for the next cycle of stamping.

Washer 5 serves as a stop for the vertical movement of the movable insert-clip 3.

The relationspecifies the relative permissible elastic deformation of the material of the movable insert-holder. In constructive terms, preferably the permissible deformation of the movable insert-holder to provide job-difference ΔD between the diameter of the bottom of the internal cavity of the fixed insert and the diameter of the bottom outer surface of the movable insert-holder.

In the stamping process moving the movable insert-clip at the beginning of the stroke of the punch assist in the centering relative to the working cavity of the tool.

At the end of the process of forming the movable insert-holder is easily removed from the fixed insert, with perhaps even their separation, because in the axial direction there is no rigid connection. This ensures pressing tool from damage. When the wear of the conical cavity of the fixed insert to compensate for the gap you can use the mobile-insert-holder with an increased diameter is m outer conical surface. The insert is the most loaded part of the stamp: work in tension-compression and subjected to increased wear. When the failure of the sliding insert is easily replaced, while retaining the stationary glass.

Thus, the proposed stamp allows you to:

to increase the yield by increasing the accuracy of forming the outer surfaces of forgings, exceptions have stamping grades;

to improve the accuracy of pressing due to self-align the top of the stamp relative to the axis of the lower part of the stamp at the beginning of the deformation process;

to improve the performance and reliability of the stamping process by reducing the retrieval time of the forging of the stamp;

to improve maintainability and service life of the stamp.

1. Stamp for closed die forging, containing the upper part, including the body, the insert, punch and samostirayuschuyusya clip hanging from a punch with tie rods, and lower parts, including the chassis, insert and eject, characterized in that the insert bottom part made the team and consists of a fixed insert with a conical cavity which carries with it the outer surface of the movable insert-holder having a cylindrical internal surface and insert the bottom mating surface of the fixed insert and the movable insert-holder made Soglom mates exceeding the angle-locking, and on the inner surface of the movable insert clip made the rib, which set box-bottom.

2. The stamp according to claim 1, characterized in that the diameter of the lower base of the conical cavity of the fixed insert is made smaller than the diameter of the bottom outer surface of the movable insert-clip on the value ΔD, which is determined from the following conditions:

where ΔD - the difference between the diameter of the bottom outer surface of the movable insert-holder and the diameter of the lower base of the conical cavity of the fixed insert, mm;

σSIMP.- the limit of elasticity of the material of the movable insert-holder, MPa;

E - the modulus of elasticity of the material of the movable insert-holder, MPa;

D is the diameter of the inner cylindrical surface of the movable insert-holder, mm

3. The stamp according to claim 2, characterized in that the outer diameter of the insert bottom is made smaller than the diameter of the cylindrical surface of the movable insert-clip on the value ΔD.



 

Same patents:

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EFFECT: reduced labor consumption of forging process, enhanced efficiency, less expenses for making tool.

3 cl, 4 dwg, 2 tbl

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6 cl, 7 dwg, 2 tbl, 1 ex

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2 dwg

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2 cl, 1 dwg

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5 cl, 9 dwg, 1 ex

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2 cl, 1 dwg, 1 ex

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9 dwg, 1 ex

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4 cl, 10 dwg

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EFFECT: enhanced manufacturing possibilities of method.

2 cl, 2 dwg, 2 ex

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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

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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

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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

FIELD: metallurgy; metal plastic working.

SUBSTANCE: invention can be used in form forging shops of metallurgical and machine-building plant in manufacture of vehicle wheels and like articles. Proposed tool contains die and punch holder with punch and knock-out with shaped part movable relative to die. Punch is enclosed by replaceable round holder with support flat and support surface. Die is provided with socket in upper part whose diameter corresponds to outer diameter of holder, and with support flat. Holder is installed for longitudinal displacement and engagement by its support flat and support surface with support flat of die and with punch holder, respectively. Shaped part of knock-out is made replaceable to provide possibility of making wheels of different type-sizes using one tool.

EFFECT: enlarged operating capabilities.

2 cl, 2 dwg

FIELD: plastic metal working with use of intensive plastic deformation, namely manufacture of nano-crystalline materials with improved degree of mechanical properties.

SUBSTANCE: die set includes slider and plate restricting inlet duct; stationary stop closing inlet duct and restricting together with plate outlet duct; ram and member for knocking out blank. Said member is joined with motion drive unit and it is mounted with possibility of introducing into additional through duct formed in slider. According to first variant of invention at initial position of slider its through duct is arranged in front of outlet duct. Slider may be shifter before starting pressing process by value exceeding size of through duct. According to second variant of invention through duct of slider is arranged in front of outlet duct in lower limit position of slider. Said cone-shape through duct of slider is closed by means of plug pressed-in to it.

EFFECT: improved design providing possibility for extracting last blank out of outlet duct before starting pressing of next lot of blanks.

2 cl, 5 dwg

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