CN210647734U - Wedge cross rolling mill for rolling and forming semi-axis sleeve capable of preventing rolled piece from deviating and rolling inside and outside - Google Patents

Abstract

The utility model discloses a wedge cross rolling mill for rolling and forming a semi-axis sleeve pipe with the advantages of preventing a rolled piece from deviating and carrying out opposite rolling inside and outside, which comprises an upper roller die, a lower roller die, a core die, a motor, a propulsion cylinder and a roller support; the method is characterized in that: the two ends of the core mold are respectively connected with a left rotating shaft and a right rotating shaft through square hole insertion blocks at the two ends, belt wheels on the left rotating shaft and the right rotating shaft are respectively connected with two transmission belt wheels on the same driving shaft through transmission belts for transmission, and the driving shaft is in driving connection with a driving shaft of a motor; a round baffle is fixedly arranged at the right end of the right rotating shaft and is matched with the end part of the piston rod of the propulsion cylinder; a limiting blocking rod is arranged on the roller support on the left side of the upper roller mold through a rotating pin, the middle of the limiting blocking rod is connected with the roller support on the left side of the upper roller mold through a tension spring, a resistance sleeve is arranged between the limiting blocking rod and the right rotating shaft, and the resistance sleeve is sleeved on a straight rod section of the core mold. The utility model discloses avoided the skew of rolled piece, the mandrel also withdraws from easily.

Description

Wedge cross rolling mill for rolling and forming semi-axis sleeve capable of preventing rolled piece from deviating and rolling inside and outside

Technical Field

The utility model relates to an improvement of the cross wedge rolling mill of rolling half shaft sleeve pipe, specifically speaking are the cross wedge rolling mill who prevents that the rolled piece is skew, inside and outside to the roll forming of the half shaft sleeve pipe roll of rolling, can prevent to impel to arouse the relative roll die of rolled piece to make axial displacement because of the axial of mandrel, influence the rolled piece precision, and the same direction rotation is done with last roll form to the dabber in addition, realizes rolled piece inner wall and outer wall to rolling, improves shaping speed.

Background

The semi-axis sleeve is used as an important part on an automobile rear axle and is required to bear complex alternating stress of load, the production process ensures reasonable streamline distribution of a rolled piece, compact internal organization of the rolled piece and high fatigue strength. The structure of the semi-axis bushing to be produced is shown in fig. 1: the structure of the device consists of a cylinder body 1, an annular step wall 2 with the diameter which is gradually reduced in a one-way mode from a big end to a small end on the outer wall, a horn hole 3 with the inner wall which is reduced in sequence from the big end to the small end, and a straight hole section 4; the total length of the semi-axis sleeve is 444.0mm, the diameter of the trumpet hole 3 is composed of three sections of 87.0mm, 83.8mm and 42.5mm, the distance from 87.0mm to 83.8mm is 26mm, the distance from 83.8mm to 42.5mm is 113.5mm, the diameter of the straight hole section 4 is 42.5mm, and the length of the straight hole section 4 is 304.5 mm.

At present, various reports are provided for the manufacturing process of the half-shaft sleeve, the simplest process is one-step casting forming, but the half-shaft sleeve formed by one-step casting is lack of extrusion force, so that the density of an internal structure is insufficient, the strength of the half-shaft sleeve is influenced, and the process is not basically adopted at present. The axle sleeve of the lorry at home and abroad is basically produced by adopting a forging process, but the forging process needs large forging equipment and special upper and lower dies, and the shape and the size of the upper die are consistent with those of the horn hole 3 and the straight hole section 4 on the inner wall of the cylinder 1; the inner hole of the lower die is consistent with the annular step wall 2 of the cylinder 1; the manufacturing process is complex, the material consumption is high, and the manufacturing cost is high.

With the development of technological progress, the cross wedge rolling process has been widely used for rolling automobile shaft parts, including half-axle sleeves, due to its advantages of high efficiency, material saving, environmental protection, etc.

The process for rolling the half-axle sleeve by cross wedge rolling comprises the following steps: 1. firstly, a cylindrical hollow billet 5 is cast, the structure of which is shown in fig. 2: the volume of the cylindrical hollow billet 5 is matched with that of the semi-axis sleeve to be rolled shown in figure 1, so that the rolling stub bar of the cylindrical hollow billet is minimum, the inner hole of the cylindrical hollow billet 5 is a straight hole, the aperture is 42.5mm, and the diameter of the inner hole is consistent with that of the straight hole section 4 of the semi-axis sleeve to be rolled; the outer diameter of the cylindrical hollow billet 5 is 110.0 mm; the length of the cylindrical hollow billet 5 is 305 mm; 2. the cross wedge rolling mold roller used for manufacturing has a molding angle of 30-45 degrees at the front section of the mold, an expansion angle of 4-7 degrees, a molding angle of 40-55 degrees at the rear section of the mold, and an expansion angle of 1.5-4 degrees; 3. and manufacturing a core rod, wherein the diameter of the core rod is 42.5mm and is consistent with the diameter of the inner hole of the cylindrical hollow billet 5. During rolling, heating the cylindrical hollow billet 5 to 900-1150 ℃, inserting a core rod into a straight hole in the cylindrical hollow billet 5, wherein the length of the core rod is greater than that of a semi-axis sleeve to be rolled, so that two ends of the core rod are exposed out of two ends of the cylindrical hollow billet 5, and meanwhile, after rolling forming, two ends of the core rod can still be exposed out of a rolled piece so as to be easily withdrawn from an inner hole of the rolled piece; after pushing a cylindrical hollow billet 5 with a core rod into the space between an upper wedge cross rolling die roller and a lower wedge cross rolling die roller, starting a rolling mill, wherein the cylindrical hollow billet 5 rotates and rolls while the two wedge cross rolling die rollers rotate and rolls, and when the two wedge cross rolling die rollers wedge to a forming die section from the beginning, a semi-axis sleeve blank with a central straight hole can be obtained; 4. then, a core mould with a conical head is inserted into a large-head-end straight hole of a half-shaft sleeve blank with a central straight hole by using a large rolling mill, and the shape of the outer wall and the diameter of each section of the core mould are consistent with that of a horn hole 3 and a straight hole section 4, wherein the inner wall of the core mould is sequentially reduced from the large-head end to the small-head end in the figure 1; and (3) loading the semi-axis sleeve blank with a central straight hole in a waste heat state into the lower die, inserting the core die into the inner hole of the semi-axis sleeve blank, and pressing down the core die through a forging press to change the central straight hole at the large head end of the semi-axis sleeve blank into the horn hole 3, thereby obtaining the semi-axis sleeve rolled piece. Obviously, the rolling process of the half-axle sleeve is superior to the forging process, but has obvious defects: firstly, the one-step forming still cannot be carried out, and special upper and lower dies need to be manufactured, so that the production process is still complex; secondly, in the forging process, an external mold matched with the step of the outer wall of the semi-axis sleeve blank and a core mold consistent with the inner hole of the semi-axis sleeve blank still need to be manufactured, and the manufacturing process is not obviously reduced; thirdly, the outer wall of the half-shaft sleeve is a hollow step shaft with the diameter being gradually reduced in a one-way mode from the large head end to the small head end, so that the wedge starting depth of the cross wedge rolling roller die is gradually increased from the large head end to the small head end and is extended in a one-way mode, and the one-way extension leads the deflection of force, so that the end head of a rolled piece is deflected, and the precision of the rolled piece is influenced; in addition, since the core mold is pressed, an ejector is also required for ejection, and ejection is also laborious.

It can be known from the search that in order to enable the half-axle sleeve to be rolled and formed at one time by a cross wedge rolling process, the chinese patent "light automobile rear axle half-axle sleeve and cross rolling machine thereof" filed by shenyang automobile manufacturers at 1987.07.22, patent No. CN87203484, discloses a rolling device which comprises a rolling die, a core die, a main running system, and a feeding and returning system, wherein the rolling die is adapted to the shape of the half-axle sleeve, the core die comprises a conical section and a straight rod section which are consistent with the shape of the inner hole of the half-axle, and the core die is pushed into the central straight hole of a rolled piece by a pushing device; the pushing device comprises a feeding box, a lead screw, a feeding mechanism, a material returning mechanism and a push rod, wherein the end part of the push rod is fixedly connected with the large end of the core die, the core die is pushed into a central straight hole of a rolled piece through the push rod in the rolling process, the outer wall of the rolled piece is rolled into a step shaft consistent with the outer wall of the semi-axis sleeve, and meanwhile, the inner wall of the straight hole of the rolled piece is rolled into a tapered hole and a straight hole consistent with the inner wall of the semi-axis sleeve, so that the rolling of the semi-axis sleeve is completed at one time. The patent has the advantages that: the rolling process is less, the upper die and the lower die are not manufactured, the working efficiency is improved, and the rolled piece can be rolled into a semi-axis sleeve blank at one time; the defects are as follows: 1. the structure is still complex, and the manufacturing cost is high; 2. because the core mold is pushed in one direction, the core mold is forced in one direction, and has obvious thrust to the rolled piece in the rolling process, so that the deflection of the acting force of the rolled piece is increased, and the precision of the rolled piece is further influenced; 3. the core die does not rotate relative to the rolled piece, so that the rolling speed is reduced, and meanwhile, the core die is extruded and is tightly contacted with the inner hole of the rolled piece, so that the difficulty of withdrawing the core die is increased.

Disclosure of Invention

The utility model aims to provide a semi-axis sleeve blank which has simple structure, convenient use and few rolling procedures, can roll a rolled piece into a semi-axis sleeve blank at one time and improves the working efficiency; in the rolling process, the core die cannot push the rolled piece obliquely when being pushed, so that the rolling epitaxial speed is increased, and the material density is improved; meanwhile, the core die can not be extruded with the rolled piece into a whole, and the core die is easy to withdraw, prevents the rolled piece from deviating and is rolled by the semi-axis sleeve which is rolled inside and outside.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the wedge cross rolling mill for rolling and forming the semi-axis sleeve pipe with the functions of preventing a rolled piece from deviating and carrying out opposite rolling comprises an upper roller die, a lower roller die, a core die, a motor, a propelling cylinder and a roller support; the surfaces of the upper roller die and the lower roller die are provided with rolling surfaces matched with the annular step wall on the outer wall of the half-shaft sleeve to be rolled, and two ends of the upper roller die and the lower roller die are respectively arranged on a rack of the cross wedge rolling mill through roller supports; the mandrel consists of a conical head section and a straight rod section, and the shape of the outer wall of the conical head section is consistent with that of the inner wall of the horn hole of the semi-axis sleeve to be rolled; the method is characterized in that: the two ends of the core mold are respectively provided with a square hole plugging block, the square hole plugging blocks at the two ends are respectively connected with a left rotating shaft and a right rotating shaft, the two ends of the left rotating shaft and the right rotating shaft are respectively provided with a bearing seat, belt pulleys are arranged on the left rotating shaft and the right rotating shaft, the belt pulleys on the left rotating shaft and the right rotating shaft are respectively connected with two driving belt pulleys on the same driving shaft through a driving belt for driving, and the middle part of the driving shaft is connected with a driving shaft of a motor through two conical gears which are meshed with each other; a round baffle is fixedly arranged at the right end of the right rotating shaft, and a thimble hole in the outer wall of the round baffle is matched with a thimble at the end part of a piston rod of the propulsion cylinder; a limiting blocking rod is arranged on the roller support on the left side of the upper roller mold through a rotating pin, the middle part of the limiting blocking rod is connected with the roller support on the left side of the upper roller mold through a tension spring, a resistance sleeve is arranged between the limiting blocking rod and a right rotating shaft, the resistance sleeve is sleeved on a straight rod section of the core mold, the diameter of an inner cavity of the resistance sleeve is consistent with that of the straight rod section of the core mold, the lower end of the limiting blocking rod is blocked at the left end face of the resistance sleeve, and the right end of the resistance sleeve is abutted to the left end face of the cylindrical hollow billet; the left rotating shaft and the right rotating shaft are both provided with belt wheel guide rails.

Bearing seats are arranged at two ends of the driving shaft.

The distance between the circular baffle at the right end of the right rotating shaft and the bearing seat at the right end of the right rotating shaft is equal to the length of the conical head section of the core mold.

The beneficial effects of the utility model reside in that: the resistance sleeve can offset the thrust of the conical head section of the core mould to the cylindrical hollow billet rolled piece, so that the offset of the cylindrical hollow billet rolled piece is avoided in the rolling process; the core die is actively rotated in the rolling process, so that the inner wall of the cylindrical hollow billet rolled piece and the outer wall of the rolled piece are simultaneously rolled, the forming speed of the rolled piece is improved, and the quality of the rolled piece is improved; because the core mould is always rotated, the tight extrusion of the inner hole of the rolled piece and the core mould is avoided, and the core mould is easy to withdraw.

Drawings

Fig. 1 is an enlarged schematic view of the axial sectional view of the structure of the half-axle sleeve to be produced by the present invention.

Fig. 2 is an enlarged schematic axial sectional view of the cylindrical hollow billet of the present invention.

Fig. 3 is a schematic view of the front view of the structure of the present invention.

Fig. 4 is an enlarged schematic top view of the structure of the core mold of the present invention.

Fig. 5 is an enlarged schematic view of the assembly structure of the motor and the driving shaft of the present invention.

Fig. 6 is a schematic view of the end face structure of the resistance sleeve of the present invention.

Fig. 7 is an enlarged schematic view of the assembly structure of the resistance sleeve, the limiting blocking rod and the tension spring of the present invention.

Fig. 8 is a schematic view showing the rotation states of the upper roll mold, the lower roll mold, the cylindrical hollow steel billet, and the core mold according to the present invention.

In the figure: 1. a cylinder; 2. an annular step wall; 3. a horn hole; 4. a straight hole section; 5. a cylindrical hollow billet; 6. an upper roller die; 7. a lower roll mold; 8. a core mold; 81. a conical head section; 82. a straight rod section; 9. a roll stand; 10. a square orifice splicing block; 11. a left rotating shaft; 12. a right rotating shaft; 13. a pulley; 14. a transmission belt; 15. a drive shaft; 16. a drive pulley; 17. a bevel gear; 18. a motor; 19. propelling the cylinder; 20. a thimble; 21. a round baffle plate; 22. a resistance sleeve; 23. a limiting stop bar; 24. a tension spring; 25. a pulley guide; 26. and a bearing seat.

Detailed Description

Referring to fig. 3, 4, 5, 6, 7 and 8, the present invention is manufactured so as to roll the half-shaft sleeve shown in fig. 1 by using the cylindrical hollow billet shown in fig. 2.

As shown in fig. 2, the central hole of the used cylindrical hollow billet 5 is a straight hole, the aperture is 42.5mm, and is consistent with the diameter of the straight hole section 4 in the semi-axis sleeve to be rolled, the outer diameter of the cylindrical hollow billet 5 is 111.0mm, and is consistent with the outer diameter of the big head end of the semi-axis sleeve to be rolled, and the length of the cylindrical hollow billet 5 is 305mm, so that the volume of the cylindrical hollow billet is matched with the volume of the semi-axis sleeve to be rolled, and the calculation can obtain the semi-axis sleeve to be rolled.

The wedge cross rolling mill for rolling and forming the semi-axis sleeve pipe with the functions of preventing a rolled piece from deviating and carrying out opposite rolling comprises an upper roller die 6, a lower roller die 7, a core die 8, a motor 18, a propulsion cylinder 19 and a roller support 9; the surfaces of the upper roller die 6 and the lower roller die 7 are provided with rolling surfaces matched with the annular step wall 2 on the outer wall of the half-shaft sleeve to be rolled, and the two ends of the upper roller die 6 and the lower roller die 7 are respectively arranged on a frame of the cross wedge rolling mill through roller supports 9; the core mold 8 consists of a conical head section 81 and a straight rod section 82, the shape of the outer wall of the conical head section 81 is consistent with the shape of the inner wall of the horn hole 3 of the semi-axis sleeve to be rolled, and the diameter of the straight rod section 82 is 42.5 mm; the length of the core mold 8 is 480 mm; the method is characterized in that: the two ends of the core mold 8 are respectively provided with square-hole insertion blocks 10, the square-hole insertion blocks 10 at the two ends are respectively connected with a left rotating shaft 11 and a right rotating shaft 12, the two ends of the left rotating shaft 11 and the right rotating shaft 12 are respectively provided with a bearing seat 26, belt wheels 13 are respectively arranged on the left rotating shaft 11 and the right rotating shaft 12, the belt wheels 13 on the left rotating shaft 11 and the right rotating shaft 12 are respectively connected with two driving belt wheels 16 on the same driving shaft 15 through driving belts 14 for transmission, and the middle part of the driving shaft 15 is connected with a driving shaft of a motor 18 through two conical gears 17 which are mutually meshed, so that when the motor 18 is started, the driving shaft 15 is rotated, the left rotating shaft 11 and the right rotating shaft 12 are driven to rotate synchronously and equidirectionally simultaneously, thereby driving the core mold 8 to rotate, and because the two ends of the core mold 8 are driven synchronously and equidirectionally simultaneously, the core mold 8 is prevented from, Deformation, and meanwhile, after the rolling process is finished, the core die 8 is always in a rotating state in the rolling process, so that the core die is prevented from being tightly extruded with the inner wall of a rolled piece, and the core die 8 is easy to withdraw; a round baffle plate 21 is fixedly arranged at the right end of the right rotating shaft 12, and a thimble hole on the outer wall of the round baffle plate 21 is matched with a thimble 20 at the end part of a piston rod of the pushing cylinder 19, so that when the piston rod of the pushing cylinder 19 extends, the thimble 20 is propped in the thimble hole of the round baffle plate 21 at the right end of the right rotating shaft 12, thereby pushing the core mould 8 to move leftwards, and the core mould 8 rotates while pushing a conical head section 81 of the core mould 8 into a straight hole of the cylindrical hollow billet 5, so that the straight hole of the cylindrical hollow billet 5 is rolled into a horn hole 3;

the roller support 9 at the left side of the upper roller mold 6 is provided with a limit stop rod 23 through a rotating pin, the middle part of the limit stop rod 23 is connected with the roller support 9 at the left side of the upper roller mold 6 through a tension spring 24, a resistance sleeve 22 is arranged between the limit stop rod 23 and the right rotating shaft 12, the resistance sleeve 22 is sleeved on a straight rod section 82 of the core mold 8, the diameter of an inner cavity of the resistance sleeve 22 is consistent with that of the straight rod section 82 of the core mold 8, the lower end of the limit stop rod 23 is stopped at the left end surface of the resistance sleeve 22, the right end of the resistance sleeve 22 is abutted to the left end surface of the cylindrical hollow steel billet 5, the extension resistance generated by the resistance sleeve 22 to the cylindrical hollow billet 5 offsets the thrust generated by the conical head section 81 of the core mould 8 pushed into the straight hole of the cylindrical hollow billet 5 to the cylindrical hollow billet 5, thereby avoiding the offset of the cylindrical hollow billet 5 relative to the mould;

the left rotating shaft 11 and the right rotating shaft 12 are both provided with belt wheel guide rails 25, the belt wheels 13 can move on the left rotating shaft 11 and the right rotating shaft 12 through the belt wheel guide rails 25, and when the propulsion cylinder 19 pushes the left rotating shaft 11 and the right rotating shaft 12 to move, the belt wheels 13 can axially move along the left rotating shaft 11 and the right rotating shaft 12 under the pulling force of the transmission belt 14, and meanwhile, the left rotating shaft 11 and the right rotating shaft 12 are driven to rotate.

The utility model discloses still implement through following measure: the outer diameter of the conical head section 81 of the core mold 8 from the big end to the small end is composed of three sections of 87.0mm, 83.8mm and 42.5mm, the distance from 87.0mm to 83.8mm is 26.0mm, and the distance from 83.8mm to 42.5mm is 113.5 mm.

Bearing seats are arranged at two ends of the driving shaft 15.

The distance between the circular baffle 21 at the right end of the right rotating shaft 12 and the bearing seat 26 at the right end of the right rotating shaft 12 is equal to the length of the conical head section 81 of the core mold 8, so that the propulsion cylinder 19 stops working when the conical head section 81 is pushed into a proper position.

The tension of the tension spring 24 can be adjusted according to the thrust generated by pushing the conical head section 81 into the cylindrical hollow billet 5.

When the utility model is used, the straight rod section 82 of the core mould 8 sequentially passes through the inner cavity of the cylindrical hollow steel billet 5 and the inner cavity of the resistance sleeve 22, and then the core mould 8 is connected between the left rotating shaft 11 and the right rotating shaft 12, so that the cylindrical hollow steel billet 5 is positioned between the upper roller mould 6 and the lower roller mould 7 for rolling; the propulsion cylinder 19 is started, the propulsion cylinder 19 pushes the core mold 8 to rotate and move left, when the cylindrical hollow billet 5 extends towards the left side due to rolling, the resistance sleeve 22 is pushed to move left, the left end of the resistance sleeve 22 pushes the lower end of the limit stop rod 23 to rotate outwards, when the right end face of the conical head section 81 of the core mold 8 is pushed into and is in a position perpendicular to the right end face of the cylindrical hollow billet 5, the propulsion cylinder 19 stops working, at the moment, the lower end of the limit stop rod 23 is separated from the left end face of the resistance sleeve 22, under the action of the tension spring 24, the lower end of the limit stop rod 23 can only slide along the upper surface of the resistance sleeve 22, the cylindrical hollow billet 5 cannot be prevented from extending due to thinning due to rolling, meanwhile, a certain resistance is provided, the formed section of a rolled piece becomes flat, and the material density of the rolled.

Claims (3)

1. The wedge cross rolling mill for rolling and forming the semi-axis sleeve pipe with the functions of preventing rolled pieces from deviating and performing opposite rolling comprises an upper roller die (6), a lower roller die (7), a core die (8), a motor (18), a propelling cylinder (19) and a roller support (9); the surfaces of the upper roller die (6) and the lower roller die (7) are provided with rolling surfaces matched with the annular step wall (2) on the outer wall of the semi-shaft sleeve to be rolled, and the two ends of the upper roller die (6) and the lower roller die (7) are respectively arranged on a frame of the cross wedge rolling mill through roller supports (9); the mandrel (8) consists of a conical head section (81) and a straight rod section (82), and the shape of the outer wall of the conical head section (81) is consistent with that of the inner wall of the horn hole (3) of the semi-axis sleeve to be rolled; the method is characterized in that: the two ends of the core mold (8) are respectively provided with a square hole plugging block (10), the core mold (8) is respectively connected with a left rotating shaft (11) and a right rotating shaft (12) through the square hole plugging blocks (10) at the two ends, the two ends of the left rotating shaft (11) and the right rotating shaft (12) are respectively provided with a bearing seat (26), the left rotating shaft (11) and the right rotating shaft (12) are respectively provided with a belt wheel (13), the belt wheels (13) on the left rotating shaft (11) and the right rotating shaft (12) are respectively connected with two transmission belt wheels (16) on the same driving shaft (15) through a transmission belt (14) for transmission, and the middle part of the driving shaft (15) is connected with a driving shaft of a motor (18) through two conical gears (17) which are meshed with each other; a round baffle plate (21) is fixedly arranged at the right end of the right rotating shaft (12), and a thimble hole on the outer wall of the round baffle plate (21) is matched with a thimble (20) at the end part of a piston rod of the propulsion cylinder (19); a limiting blocking rod (23) is arranged on a roller support (9) on the left side of the upper roller mold (6) through a rotating pin, the middle part of the limiting blocking rod (23) is connected with the roller support (9) on the left side of the upper roller mold (6) through a tension spring (24), a resistance sleeve (22) is arranged between the limiting blocking rod (23) and the right rotating shaft (12), the resistance sleeve (22) is sleeved on a straight rod section (82) of the core mold (8), the diameter of an inner cavity of the resistance sleeve (22) is consistent with that of the straight rod section (82) of the core mold (8), the lower end of the limiting blocking rod (23) is blocked at the left end face of the resistance sleeve (22), and the right end of the resistance sleeve (22) is abutted to the left end face of the cylindrical hollow billet (5); the left rotating shaft (11) and the right rotating shaft (12) are both provided with belt wheel guide rails (25).

2. The cross wedge rolling mill for rolling and forming of split axle sleeves for preventing deviation of rolled pieces and opposite rolling inside and outside according to claim 1, is characterized in that: and bearing seats are arranged at two ends of the driving shaft (15).

3. The cross wedge rolling mill for rolling and forming of split axle sleeves for preventing deviation of rolled pieces and opposite rolling inside and outside according to claim 1, is characterized in that: the distance from the round baffle (21) at the right end of the right rotating shaft (12) to the bearing seat (26) at the right end of the right rotating shaft (12) is equal to the length of the conical head section (81) of the core mould (8).

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