阅读说明：本技术 丁字臂下沉式镦粗模 (T-arm sinking type upsetting die ) 是由 张运军 倪权斌 陈天赋 晏洋 武建祥 李航 姚会婷 夏少仙 陈朝英 牛洪波 李海 于 2021-08-28 设计创作，主要内容包括：本发明涉及锻造模具技术领域,尤其涉及一种丁字臂下沉式镦粗模,其包括上模和下模,所述上模设置有用于吸纳镦粗瞬间冲击力的缓冲腔,所述缓冲腔为向上拱起的球冠状；所述下模设置有用于校正头部下部变形的校正腔和用于成型臂身的臂身型腔,所述臂身型腔的上部为带有拔模角的锥形腔,所述臂身型腔的下部设置有直径不变的正料型腔,所述正料型腔的下端设置有从上至下直径逐渐减小的收缩腔。本发明使丁字臂的头部的一部分在所述下模成形,从而在锻造时使所述下模的型腔对坯料进行包裹,并引导金属流向,所述正料型腔可以无需考虑圆钢的端面斜度,其包裹圆钢的圆周面从而无需人工校正就可以快速把圆钢放正,防止坯料弯曲、产生褶皱裂纹。(The invention relates to the technical field of forging dies, in particular to a T-arm sinking type upsetting die which comprises an upper die and a lower die, wherein the upper die is provided with a buffer cavity for absorbing upsetting instant impact force, and the buffer cavity is in the shape of an upwardly arched spherical crown; the lower mould is provided with the correction chamber that is used for rectifying head lower part deformation and the arm body die cavity that is used for the shaping arm body, the upper portion of arm body die cavity is the toper chamber that has the draft angle, the lower part of arm body die cavity is provided with the unchangeable material die cavity of just giving birth to of diameter, the lower extreme of material die cavity is provided with from last shrink chamber that reduces gradually to the diameter down. The invention enables a part of the head part of the T-shaped arm to be formed on the lower die, so that the die cavity of the lower die wraps the blank during forging and guides the flow direction of metal, the end face inclination of the round steel does not need to be considered by the material correcting die cavity, the circumferential surface of the round steel is wrapped by the material correcting die cavity, the round steel can be quickly corrected without manual correction, and the blank is prevented from being bent and generating fold cracks.)

1. T-arm sinking type upsetting die, which is characterized in that: the upsetting device comprises an upper die (1) and a lower die (2), wherein the upper die (1) is provided with a buffer cavity (11) for absorbing upsetting instant impact force, and the buffer cavity (11) is of an upward arched spherical crown shape;

the lower die (2) is provided with a correction cavity (21) for correcting the deformation of the lower part of the head and an arm body cavity (22) for forming an arm body, the cross section of the correction cavity (21) along the horizontal direction is circular, the radius of the cross section is gradually increased along a guide line (211) from bottom to top, the guide line (211) is a smooth curve, the height of the correction cavity (21) is 1/4-1/3 of the height of the head of a T-shaped arm, the lower part of the correction cavity (21) is attached to an upset workpiece, and a gap is reserved between the upper part of the correction cavity (21) and the upset workpiece;

the upper portion of arm body die cavity (22) is for having tapered cavity (221) of draft angle, the lower part of arm body die cavity (22) is provided with unchangeable material die cavity (222) of diameter, the upper end of tapered cavity (221) with the lower extreme of correction chamber (21) passes through circular arc transitional coupling, the lower extreme of material die cavity (222) is provided with from last shrink chamber (223) that gradually reduces of diameter down.

2. The t-arm drop-down heading die of claim 1, wherein: go up mould (1) and be provided with second correction chamber (12), the upper end of second correction chamber (12) with buffer chamber (11) pass through the fillet transition, the lower extreme of second correction chamber (12) with the lower terminal surface of going up mould (1) passes through the fillet transition, second correction chamber (12) with the handing-over department in correction chamber (21) is the parting face.

3. The t-arm drop-down heading die of claim 1, wherein: the radius of the spherical crown of the buffer cavity (11) is 185-360mm, and the height of the buffer cavity (11) is 5-10 mm.

4. The t-arm drop-down heading die of claim 1, wherein: the upper end of the guide line (211) is in round-angle transition with the upper end face of the lower die (2), the lower end of the guide line (211) is in round-angle transition with the upper end of the conical cavity (221), the included angle between the tangent line of any point of the guide line (211) and the horizontal plane is not less than 30 degrees, and the included angle is constant or larger from bottom to top.

5. The t-arm drop-down heading die of claim 4, wherein: the upper end of the guide line (211) is in transition with the upper end surface of the lower die (1) through a fillet with the radius of 10mm, and the lower end of the guide line (211) is in transition with the upper end of the conical cavity (221) through a fillet with the radius of 30 mm; the diameter of the cross section of the transition round angle of the upper end surface of the guide wire (211) and the lower die (1) along the horizontal direction is 15-20mm larger than the diameter of the head of the upset workpiece.

6. The t-arm drop-down heading die of claim 1, wherein: the draft angle of the tapered cavity (221) is 0.5 °.

7. The t-arm drop-down heading die of claim 1, wherein: the height of the material cavity (222) is less than 15% of that of the arm body cavity.

8. The t-arm drop-down heading die of claim 1, wherein: the shrinkage cavity (223) is in a spherical crown shape, the radius of the spherical surface of the shrinkage cavity (223) is 25-30mm, the height of the shrinkage cavity is 5-8mm, and the upper end surface of the shrinkage cavity (223) and the lower end surface of the positive material cavity (222) are in transition through a fillet with the radius of 12-20 mm.

9. The t-arm drop-down heading die of claim 1, wherein: the lower die (2) is provided with a material ejecting hole penetrating from the bottom to the shrinkage cavity (223).

10. The t-arm drop-down heading die of claim 1, wherein: the top surface of the lower die (2) is provided with a fixed-distance cushion block (3) for limiting the descending height of the upper die (1), and when the upper die (1) pushes against the fixed-distance cushion block (3) in the descending mode, the distance between the upper die (1) and the lower die (2) is 2/3-3/4 of the head height of the T-shaped arm.

Technical Field

The invention relates to the technical field of forging dies, in particular to a T-shaped arm sinking type upsetting die.

Background

The T-shaped arm is used as an automobile accessory, bears large load and various alternating stresses, needs very high strength, and is generally produced by forging, namely round steel is heated and then forged and processed; according to the T-shaped arm, a transverse rod is generally called a head part, a longitudinal rod is called a body part or an arm body, round steel is used as forging raw materials in practice, when the upsetting ratio is larger than 2.5 or the end face inclination of the round steel exceeds 1 degree, even if workers carefully operate, the blank still often has the defects of bending, folding, overlarge wrinkles and the like, so that the blank is scrapped, and great waste is caused. In view of the head of T arm and the section size difference of arm body are huge, when adopting the round steel to forge and press, need far exceed 2.5's upset ratio, in order not to cause the material internal defect and reduce the follow-up processing degree of difficulty, and the shaping is good pleasing to the eye, needs a science and can rapid prototyping's forging mould.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a T-shaped arm sinking type upsetting die which improves a die cavity, limits the skew of a round steel blank, wraps and guides the flow direction of metal, and extrudes sharp corners at two ends of the blank to prevent folding, thereby reducing the forging operation difficulty and improving the quality of a finished product.

The technical scheme adopted by the invention for solving the technical problems is as follows: a T-shaped arm sinking type upsetting die comprises an upper die and a lower die, wherein the upper die is provided with a buffer cavity for absorbing upsetting instant impact force, and the buffer cavity is of an upward arched spherical crown shape;

the lower die is provided with a correction cavity for correcting the deformation of the lower part of the head and an arm body cavity for forming an arm body, the cross section of the correction cavity along the horizontal direction is circular, the radius of the cross section is gradually increased from bottom to top along a guide line, the guide line is a smooth curve, the height of the correction cavity is 1/4-1/3 of the height of the head of the T-shaped arm, the lower part of the correction cavity is attached to an upset workpiece, and a gap is reserved between the upper part of the correction cavity and the upset workpiece;

the upper portion of arm body die cavity is the toper chamber that has the draft angle, the lower part of arm body die cavity is provided with the unchangeable material die cavity of diameter, the upper end in toper chamber with the lower extreme in correction chamber passes through circular arc transition joint, the lower extreme in material die cavity is provided with from last shrink chamber that reduces to the diameter gradually down.

Furthermore, go up the mould and be provided with the second chamber of correcting, the upper end in second chamber of correcting with the buffer chamber passes through the fillet transition, the lower extreme in second chamber of correcting with the lower terminal surface of last mould passes through the fillet transition, the second chamber of correcting with the handing-over department in chamber of correcting is the parting face.

Furthermore, the radius of the spherical crown of the buffer cavity is 185-360mm, and the height of the buffer cavity is 5-10 mm.

Furthermore, the upper end of the guide line is in transition with the upper end face of the lower die through a fillet, the lower end of the guide line is in transition with the upper end of the conical cavity through a fillet, the included angle between the tangent line of any point of the guide line and the horizontal plane is not less than 30 degrees, and the included angle is not changed or is larger from bottom to top.

Furthermore, the upper end of the guide wire is in transition with the upper end surface of the lower die through a fillet with the radius of 10mm, and the lower end of the guide wire is in transition with the upper end of the conical cavity through a fillet with the radius of 30 mm; the diameter of the cross section of the transition round angle between the guide wire and the upper end surface of the lower die along the horizontal direction is 15-20mm larger than the diameter of the head of the workpiece after upsetting.

Further, the draft angle of the tapered cavity is 0.5 °.

Further, the height of the material correcting cavity is less than 15% of the arm body cavity.

Furthermore, the contraction cavity is in a spherical crown shape, the radius of the spherical surface of the contraction cavity is 25-30mm, the height of the contraction cavity is 5-8mm, and the upper end surface of the contraction cavity and the lower end surface of the main material cavity are in transition through a fillet with the radius of 12-20 mm.

Furthermore, the lower die is provided with a material ejecting hole penetrating from the bottom to the shrinkage cavity.

Furthermore, a fixed-distance cushion block for limiting the descending height of the upper die is arranged on the top surface of the lower die, and when the upper die pushes against the fixed-distance cushion block downwards, the distance between the upper die and the lower die is 2/3-3/4 of the head height of the T-shaped arm.

The invention has the beneficial effects that: a T-shaped arm sinking type upsetting die comprises an upper die and a lower die, wherein the upper die is provided with a buffer cavity for absorbing upsetting instant impact force, and the buffer cavity is in the shape of an upward arched spherical crown; the lower die is provided with a correction cavity for correcting the deformation of the lower part of the head and an arm body cavity for forming an arm body, the cross section of the correction cavity along the horizontal direction is circular, the radius of the cross section is gradually increased from bottom to top along a guide line, the guide line is a smooth curve, the height of the correction cavity is 1/4-1/3 of the height of the head of the T-shaped arm, the lower part of the correction cavity is attached to an upset workpiece, and a gap is reserved between the upper part of the correction cavity and the upset workpiece; the upper portion of arm body die cavity is the toper chamber that has the draft angle, the lower part of arm body die cavity is provided with the unchangeable material die cavity of diameter, the upper end in toper chamber with the lower extreme in correction chamber passes through circular arc transition joint, the lower extreme in material die cavity is provided with from last shrink chamber that reduces to the diameter gradually down. The invention enables a part of the head part of the T-shaped arm to be formed on the lower die, so that the die cavity of the lower die wraps the blank during forging and guides the metal flow direction, the end face inclination of the round steel does not need to be considered by the material correcting die cavity, the material correcting die cavity wraps the circumferential surface of the round steel, the round steel can be quickly corrected without manual correction, and the blank can be prevented from being bent and generating fold cracks.

Drawings

FIG. 1 is a schematic structural view of a T-arm drop-down upsetting die of the present invention;

fig. 2 is a schematic structural view of a t-arm drop-down upsetting die according to the second embodiment.

Description of reference numerals:

1-upper die, 11-buffer cavity, 12-second correction cavity, 2-lower die, 21-correction cavity, 211-guide line, 22-arm body cavity, 221-conical cavity, 222-material correction cavity, 223-contraction cavity and 3-fixed-distance cushion block.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the scope of the invention.

The first embodiment.

As shown in fig. 1, a t-arm sinking type upsetting die comprises an upper die 1 and a lower die 2, wherein the upper die 1 is provided with a buffer cavity 11 for absorbing an instantaneous impact force of upsetting, the buffer cavity 11 is of an upwardly arched spherical crown shape, namely the buffer cavity 11 is a segment of a sphere, the buffer cavity comprises a part between a spherical crown surface at the upper part and a plane at the bottom, the plane at the bottom is a horizontal plane, during upsetting, the edge at the upper end of a round steel firstly butts against the spherical crown surface, when the upper die continues to descend, the buffer cavity 11 can enable part of metal to flow upwards relatively to play a buffering role, and as the upper end surface of the round steel is wrapped, the round steel can be centered and rounded, so that a blank can be prevented from flowing outwards only, and lateral bending is caused by a small lateral force during upsetting, thereby causing waste materials. The spherical crown shape prevents the blank from being instantaneously bent when the upper and lower dies are in contact.

In order to further prevent the round steel from bending or generating wrinkles and form the head of the T-shaped arm, the upper die 1 is provided with a second correcting cavity 12, the upper end of the second correcting cavity 12 is in fillet transition with the buffer cavity 11, and the lower end of the second correcting cavity 12 is in fillet transition with the lower end surface of the upper die 1; the second correcting cavity 12 can correct the head during upsetting and prevent the head from being severely deformed in a certain direction, so that the side surface is uniformly deformed in all directions during upsetting. The lower die 2 is provided with a correction cavity 21 for correcting the deformation of the lower part of the head and an arm body cavity 22 for forming an arm body, the cross section of the correction cavity 21 in the horizontal direction is circular, the radius of the cross section is gradually increased from bottom to top along a guide line 211, the guide line 211 is a smooth curve, the lower part of the correction cavity 21 is attached to a workpiece after upsetting, and a gap is reserved between the upper part of the correction cavity 21 and the workpiece after upsetting. In this embodiment, the lower end surface of the upper die 1 collides with the upper end surface of the lower die 2 during upsetting, and the joint of the second correcting cavity 12 and the correcting cavity 21 is the parting surface. The function of the correction cavity 21 is similar to that of the second correction cavity 12, but more importantly, analysis of upset waste shows that the head of the blank in a larger proportion of the waste is integrally twisted to one side, and the guide wire 211 can be used for guiding the head from the lower side in the invention to avoid the head from being twisted, namely, if the head has a tendency of being twisted to one side in the upsetting process, the head collides with the guide wire 211 and is further corrected under the action of the guide wire 211. This is also the most prominent improvement of the present invention.

The invention is an improvement to the existing T-arm upsetting die, it abandons the existing parting mode of parting face at the junction of head and arm body of the T-arm, set up the parting face in the head of the T-arm, namely a part of head of T-arm after shaping is on the said upper die 1, a part is on the said lower die 2, specifically, the T-arm after upsetting, the upper part of the head is in said buffer cavity 11 and said second correction cavity 12, the inferior part of the head is in said correction cavity 21, and the inferior part of the head in said correction cavity 21 accounts for 1/4-1/3 of the head of the T-arm; since the second correction cavity 12 and the correction cavity 21 are respectively located on the upper die 1 and the lower die 2, a junction between the upper die 1 and the lower die 2 is a junction between the second correction cavity 12 and the correction cavity 21, that is, a junction between the second correction cavity 12 and the correction cavity 21 is a parting surface. As is well known, the cross-sectional dimension of the head of the T-shaped arm is far larger than that of the arm body, so that when the round steel for forging the T-shaped arm is subjected to upsetting, the part protruding out of the lower die 2 is very long, and when the T-shaped arm is subjected to upsetting, the round steel is easy to bend or generate folds, and in the embodiment, a part of an original head cavity is sunk to the lower die 2, so that the upset round steel can be wrapped, and the round steel is prevented from being bent.

According to the invention, the material correcting cavity 222 with the constant diameter is arranged at the lower section of the arm body cavity 22, the round steel is initially placed into the lower die 2 after being heated, and the material correcting cavity 222 wraps the lower part of the round steel from the outer circumference, so that the round steel is automatically and coaxially aligned along with the material correcting cavity 222 under the gravity, manual alignment is not needed, the labor and the time are saved, the operation difficulty is reduced, and the probability that the round steel is skewed is also reduced.

In this embodiment, the guiding line 211 comprises a slant line and an arc line, and the concave side of the arc line faces the mold cavity, and in addition, the upper end of the slant line is tangentially combined with the arc line, the lower end of the slant line is combined with the tapered cavity 221 through an arc, and the upper end of the arc line is transitionally combined with the upper end surface of the lower mold 2 through an arc. When the round steel is upset, the peripheral metal of the round steel firstly collides with the curved inner wall formed by the oblique line, and the round steel is wrapped by the curved inner wall and is molded into a round table; when the round steel continues upsetting, the peripheral metal of the round steel collides with the curved inner wall formed by the arc, the round steel is limited to continue upsetting because the concave side of the curved inner wall of the section faces the die cavity, and the peripheral metal of the round steel is guided to flow upwards along the arc, so that the T-shaped arm head with a certain diameter is finally formed.

In this embodiment, the radius of the spherical crown of the buffer cavity 11 is 185-360mm, the height of the buffer cavity 11 is 5-10mm, and the radius of the transition fillet between the buffer cavity 11 and the second cavity 12 is 10 mm; the included angle between the lower oblique line of the guide line 211 and the horizontal plane is 30 degrees, the included angle between the tangent line of any point of the upper end arc line of the guide line 211 and the horizontal plane is not less than 30 degrees, and the included angle is larger and larger from bottom to top; the radius of a transition fillet between the upper end of the guide wire 211 and the upper end surface of the lower die 2 is 10mm, and the radius of a transition fillet between the lower end of the guide wire 211 and the upper end of the tapered cavity 221 is 30 mm; in addition, the diameter of the cross section of the guide wire 211 and the transition round corner of the upper end surface of the lower die 2 along the horizontal direction is 15-20mm larger than the diameter of the head of the workpiece after upsetting; the draft angle of the tapered cavity 221 is 0.5 °; the height of the positive material cavity 222 is less than 15% of the arm body cavity.

In order that one end of a taper hole machined in the arm body of the T-shaped arm cannot form a sharp corner in the subsequent flattening process, so that a product is folded and scrapped, the lower end of the material correcting cavity 222 is provided with a contraction cavity 223 with the diameter gradually reduced from top to bottom, the contraction cavity 223 is of a downward spherical crown shape, and the material correcting cavity 222 and the contraction cavity 223 are in transition through a fillet, so that a spherical end is formed at the bottom of the arm body of the upset T-shaped arm.

Example two.

This embodiment is the same as the first embodiment except that: as shown in fig. 2, the second correction cavity 12 of the upper mold is eliminated, the upper part of the head of the corresponding t-arm is changed into a free forming, the height of the head of the t-arm is limited by the height of the fixed distance pad 3, and the head is guided and corrected from the upper direction and the lower direction mainly by the buffer cavity 11 of the upper mold 1 and the guide line 211 of the lower mold. Other technical features of the present embodiment are the same as those of the first embodiment, and are not described herein again.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.