Die set for flashless forging of blanks of hard-to-form-materials

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

 

The invention relates to a press-forging production, and is intended for stamping forging elongated with thickening and lateral appendages.

Famous stamp for bezoblachnoy stamping forging containing deforming punch, the matrix with a vertical connector installed between the lower and upper plates, a lifting mechanism of a matrix. Deforming punch mounted on the top plate. On the bottom plate is fixed to the housing made in the form of a clip. The matrix consists of a die-holder and removable volumetric. On the sides of volumetric symmetrically installed locking mechanism of volumetric, pivotally connecting each of them with the case. The locking mechanism of each volumetric made in the form of a pair of parallel levers mounted at an acute angle to the horizontal plane of the stamp (see USSR author's certificate No. 585910, M CL2B 21 J 13/02).

However, the locking mechanisms for volumetric known stamp have reduced stiffness and increased wear of the hinge joints, which significantly reduces the stability and service life of the stamp. In addition, at the time of forming the shock of contact with the lower die-holder plate perceived deforming punch that reduces its resistance and, accordingly, the reliability of the stamp. These shortcomings stamp lead to its unsuitability for stampout the difficult-to-deform materials.

Famous stamp for bezoblachnoy stamping forging of difficult-to-deform materials containing deforming punch, the matrix with the outer conical surface and a vertical connector, dividing it into volumetric race with an internal conical cavity. The matrix is installed in the holder can be moved relative to the conical cavity of the latter (see the book of Atroshenko A.P., V.I. Fedorov Hot stamping hard materials. - L.: engineering, 1979, s, RES).

The main disadvantages described stamp for bezoblachnoy stamping forging of hard materials is the absence of the possibility of conversion, as its design is not provided to adjust the clamping forces of polymetric that is necessary when replacing the matrix or clip after wear and regrinding the bevel surfaces; low life, because at the time of tostanoski matrix gets jammed into the conical cavity of the shroud and the rise of a matrix is difficult.

Closest to the proposed invention to the technical essence and the achieved result (prototype) is the stamp for bezoblachnoy stamping forging of difficult-to-deform materials containing deforming punch, two racks, made in the form of truncated pyramids with unilateral wedge slanted to install the matrix is within the appropriate two-way V-bevel and a vertical connector, the mount racks, made in the form of coupling bolts with spacers placed between the posts, and bolts securing the uprights to the base plate. Matrix installed in the racks can be moved relative to them (see the book of Atroshenko A.P., V.I. Fedorov Hot stamping trudnozapominaemyj materials. - L.: engineering, 1979, s, RES).

The design of this stamp allows after repeated regrinding inclined bevels racks and volumetric to carry out the changeover of the stamp.

The main disadvantages of the stamp for bezoblachnoy stamping forging of hard materials are low rigidity and reliability, as when punching hard materials large spacer efforts cause significant elastic deformation of the system “rack-matrix with attachment points in the form of coupling bolts and bolts of the uprights to the base plate; in addition, the unregulated descent matrix it jams between the wedge slanted racks at the time of tostanoski, which greatly accelerates the wear of the contact surfaces of the uprights and the matrix and makes it difficult ascent matrix after stamping.

The invention solves the problem of increasing the rigidity and reliability of the stamp for bezoblachnoy stamping forging of hard materials.

For pros who supply this technical result in the stamp for bezoblachnoy stamping forging of hard materials, containing deforming punch, the matrix with a vertical connector, dividing it into polimetrica, racks, made in the form of truncated pyramids with a wedge slanted to install the matrix, attachment fittings, racks, and matrix installed in the stalls and can move relative to them, the rack is made with two-way opposite wedge bevels, and under the matrix is hosted entered in the stamp elastic element, the value of the maximum compression which when force corresponding to the clamping force of volumetric racks, equal to the amount of lowering of the matrix for stamping.

The angles of the bevels of the racks and the size of the grounds stands is determined from the condition

where lp- estimated distance from the axis of the matrix to mount the rack to the base plate;

hp- the distance from the plane, combined with the support surfaces of the uprights until the mid-height of the stream matrix in its lower position;

hkr- the height of the mount stand to the base plate relative to the support surface of the rack,

α - the angle of the bevel in contact with the matrix surface of the rack.

The increase in the rigidity and reliability of the stamp for bezoblachnoy stamping forging is provided, firstly, the implementation supports two-way opposite wedge bevels and wedge mount large basis is any racks to the base plate, secondly, the introduction of the elastic element as a cushioning device to protect the press and stamp, especially deforming punch, overload, preventing jamming of the matrix between the wedge slanted racks at the time of tostanoski and facilitate lifting of the matrix in the inverse springback of the elastic element, and to provide controlled subsidence of the matrix in the stamping process.

The invention is illustrated by a drawing, which shows a stamp for bezoblachnoy stamping forging of difficult-to-deform materials in the context of: left : the original position of the stamp before stamping; on the right, the position of the stamp at the end of the stamping.

Stamp for bezoblachnoy stamping forging of hard materials contains deforming punch 1, a matrix with two-sided wedge bevel and a vertical connector, dividing it into polimetrica 2, which is formed stream for the installation of the workpiece. In polimetrica 2 posted by ejector 3 forgings, having the ability to move in the groove of one of the poles 4.

Hours 4 made in the form of truncated pyramids and equipped with two-way opposite wedge bevel. Matrix mounted wedge slanted in opposite wedge slanted racks 4 can move relative to these racks. External bevels article is EC 4 mated with nodes 5 mounting racks to the base plate 6, made in the form of the V-rails and screws.

Under the matrix posted elastic element 7, as well as the lifting mechanism is equipped with, for example, a pneumatic cylinder (not shown) and a hollow plunger 8. The maximum compression of the elastic element 7 when the force corresponding to the force clamping the floor matrices 2 racks 4, equal to the amount of lowering of the matrix for stamping. On the upper surfaces of the racks 4 installed hard fonstein 9. To collect forgings under the pusher 8 is a hopper (not shown).

The angles of the bevels of the uprights 4 and the size of the grounds is determined from the condition (1).

Stamp for bezoblachnoy stamping forging of trudnozapominaemyj materials is as follows:

In the initial position of the stamp matrix loosely based on the elastic element 7, ensuring full closure of volumetric 2. In formed by pilomatricoma 2 stream is set to blank. When the movement of the punch 1 down the workpiece is deformed. At the same time under the action of forging force matrix is lowered by wedge slanted racks 4, overcoming the resistance of the elastic deformation of the system “rack - matrix and the elastic element 7. As lowering of the matrix increases the clamping force of polymetric 2, reaching the regulated value at the time of tostanoski when the estimated amount of lowering of the matrix. This point, which corresponds to the maximum compression of the elastic element 4, further restricting the lowering of the matrix.

After stamping the matrix returns to its original position in the reverse springback of the elastic element 7, and then the pusher 8 rises to thrust brackets 9. This ensures the formation of a cavity between pilomatricoma 2, sufficient for the free removal of the forging. During lifting of the matrix end of the ejector 3, moving through the bevel groove of the rack 4, pushes the forging in the cavity between pilomatricoma 2. Under the action of its own weight forged through the hollow plunger 8 falls into the bunker.

Thus, the back pressure of the elastic element 7 limits the lowering of the matrix to a value corresponding to a required clamping volumetric 2. This eliminates the jamming matrix between the posts 4, which can significantly reduce the wear of the inclined surfaces of the uprights 4 and matrix and facilitates the rise of the matrix after forming as a result of the inverse springback of the elastic element 7 matrix returns to its original position. In addition, the use of the elastic element 7 as a shock-absorbing device protects against overloading of the press and stamp, especially deforming punch 1.

Calculation of parameters of the elastic element 7 is performed in the following order. Initially determines necessary to clamp the matrix size its about what Ascania on wedge slanted racks 4.

The clamping force can be found from the relation

Ptagy·Stag, (2)

where Rtag- efforts clip bolometric 2;

Stag- the surface area of the clamp bolometric 2;

σy- the limit of elasticity of the material of polymetric 2, determined according to Hooke's law

σy=ε · E (3)

where ε - the degree of elastic deformation of volumetric 2;

E - the modulus of elasticity of the material of volumetric 2.

The degree of elastic deformation is determined from the expression

wherenthe cross - sectional dimension of polimetrica 2 to stamping;

intothe cross - sectional dimension of polimetrica 2 after stamping;

lopthe magnitude of the lowering of the matrix;

α - the angle of the bevel in contact with the stand 4 the surface of the matrix.

Taking into account formulas (2) and (3) from the formula (4) receive

As you know, the clamping force of polymetric 2 for stamping in the matrix with a vertical connector reaches 75-100% of the effort (PPCs) stamping (see the book of Atroshenko A.L. and V.I. Fedorov Hot stamping hard materials. - L.: engineering, 1979, 146, third paragraph from the bottom).

Then the formula (5) to calculate required for clamping volumetric lowering matrices takes the form

For races is to maintain the magnitude of the lowering of the matrix and clamping parameters of the elastic element 7.

Application design racks 4 in the form of truncated pyramids with two opposite wedge bevels and wedge mount large grounds, calculated from the condition (1), provide direction vectors ravetastic spacer efforts made by the middle of the height of the stream matrix at the time of tostanoski, not above node 5 mounting rack 4 to the base plate of the stamp, which excludes the occurrence of overturning moment racks 4 action spacer efforts in the stamping process and thereby increases the rigidity and reliability of the stamp.

An example of the calculation of the elements of the stamp.

1. Calculation of parameters of the elastic element.

For stamping tee with a diameter equal to 32 mm, of steel grade ONT current clamping amounted to 420 TC. The cross-sectional dimension of polimetrica 2 to punching equal to 70 mm, the angle of bevel of the side surfaces α =7° ; modulus of elasticity of steel, E=2,1· 104kg/mm2; the surface area of the clamp bolometric 2 is 2800 mm2.

By the formula (6) we obtain

The value of the maximum compression of the elastic element, equal to the value (lop) lowering matrix for stamping, and the clamping force of volumetric Ptag=0,RPCs=315 TC with regard to design stamp sizes chosen, for example, the elastic element in the form of a set t is relatig springs.

2. The calculation of basic elements stamp

For constructive reasons, the distance from the supporting surface of the rack 4 to the mid-height of the stream matrix at the end of the stamping was hp=86 mm; the height of mount rack hkr=64 mm; the angle of the bevel in contact with the matrix surfaces of the uprights α = 7° .

By the formula (1) defined

Accept lp=180 mm, taking into account the previously detected structural elements of the stamp is calculated sizes of the bases of the uprights 4.

Thus, the use of racks in the form of truncated pyramids with two opposite wedge bevels with wedge fastening large grounds to the base plate of the stamp, designed from the ground up to ensure maximum stiffness design of the stamp, and the introduction of the elastic element as regulating the amount of lowering of the matrix and, in addition, a shock-absorbing device can significantly improve the rigidity and reliability of the stamp.

1. Stamp for bezoblachnoy stamping forging of difficult-to-deform materials containing deforming punch, the matrix with a vertical connector, dividing it into polimetrica, racks, made in the form of truncated pyramids with a wedge slanted to install the matrix, the attachment points of the uprights to the base plate, and the matrix is installed in racks with the possibility lane is a mix concerning them, characterized in that the rack is made with two-way opposite bevels, and under the matrix is hosted entered in the stamp elastic element, the value of the maximum compression which when force corresponding to the clamping force of volumetric racks, equal to the amount of lowering of the matrix for stamping.

2. The stamp according to claim 1, characterized in that the angles of the bevels of the racks and the size of the grounds stands is determined from the condition

where lp- estimated distance from the axis of the matrix to mount the rack to the base plate;

hp- the distance from the plane, combined with the support surfaces of the uprights until the mid-height of the stream matrix in its lower position;

hkr- the height of the mount stand to the base plate relative to the support surface of the rack;

α - the angle of the bevel in contact with the matrix surface of the rack.



 

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