Rolling device for a bar

Abstract

The application discloses a bar rolling blanking device and belongs to the technical field of bar rolling, which comprises an upper die and a lower die, wherein the upper die comprises an upper die bottom plate, a punch and a pressing rod; the punch and the pressing rod are arranged below the upper die bottom plate; the lower die comprises a lower die bottom plate, a positioning support, a positioning wheel, a bearing support, a rolling wheel set and a floating positioner; the positioning support, the bearing support and the floating positioner are arranged above the lower die bottom plate; a limiting guide groove is formed in one side of the positioning support; the bearing support is hinged with the rolling wheel set on the side close to the positioning support; the floating positioner is located below the pressing rod and moves up and down along with the pressing rod. Compared with the prior art, the application has the advantages of simple manufacturing and installation, low maintenance cost, guaranteed blanking quality, reduced labor cost and labor intensity, and can be operated by using general stamping equipment such as punch presses or oil presses, without the need of using special equipment such as roll forging machines and wedge cross rolling machines.

Description

Technical Field

[0001] This invention relates to the field of bar rolling technology, and in particular to a bar rolling and billet forming apparatus. Background Technology

[0002] In the mechanical forging industry, hot forging often requires rolling of bar stock. Currently, specialized hot forging equipment such as roll forging mills and wedge roll mills are commonly used to roll bar stock. However, the purchase cost of specialized hot forging equipment such as roll forging mills and wedge roll mills is high, and highly skilled personnel who can operate specialized equipment are also required, resulting in high labor costs. In addition, the cost of subsequent maintenance is also high. Alternatively, simple modules are used, and punch presses are used for extrusion, which can produce defects such as sharp edges and wing-like defects in the billet shape, thus affecting the quality of the forgings. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the above-mentioned conventional technologies and provide a bar rolling blank device that can be installed on general-purpose stamping equipment such as punch presses or hydraulic presses, so as to achieve the same bar rolling effect as special hot forging blank equipment such as roll forging machines and wedge cross rolling mills.

[0004] The present invention provides a bar stock rolling blank preparation device, comprising an upper die and a lower die, characterized in that the upper die includes an upper die base plate, a punch, and a lower pressure rod; both the punch and the lower pressure rod are disposed below the upper die base plate; the punch is a plate-shaped structure with a bevel; the lower die includes a lower die base plate, a positioning bracket, positioning wheels, a bearing bracket, a rolling wheel assembly, and a floating positioner; the positioning bracket, the bearing bracket, and the floating positioner are disposed above the lower die base plate; a limiting guide groove is provided on one side of the positioning bracket to cooperate with the planar side of the punch, the limiting guide groove being located below the punch; the positioning bracket also has positioning wheels symmetrically arranged on both sides of the limiting guide groove, the positioning wheels being hinged to the positioning bracket; the bearing bracket is located on one side of the positioning bracket, and the punch is located between the positioning bracket and the bearing bracket; a rolling wheel assembly is hinged to the side of the bearing bracket near the positioning bracket; the floating positioner is located below the lower pressure rod, and the floating positioner moves up and down with the lower pressure rod; the floating positioner includes an axial positioning component.

[0005] Furthermore, the roller assembly includes two rollers, each roller mainly consisting of a mandrel and a sleeve; the mandrel is hinged to the bearing support at both ends by bearings, and the sleeve is slidably fitted outside the mandrel with a small clearance.

[0006] Furthermore, the bearing support is equipped with a water mist spraying device on the side of the rolling roller assembly away from the positioning support.

[0007] Furthermore, the floating positioner also includes a support rod, an angle steel seat, and a spring; the support rod passes through the lateral side of the angle steel seat and is fixedly connected to the lower mold base plate; the spring is fitted outside the support rod and is located between the angle steel seat and the lower mold base plate; the axial positioning assembly includes an adjusting rod and a limiting block; the limiting block is set on the angle steel seat and has a blind hole; the adjusting rod includes a screw part and a smooth rod part set at one end of the screw part; a nut is set on the outer side of the vertical side of the angle steel seat; the adjusting rod passes through the vertical side of the angle steel seat through one end of the smooth rod part and is inserted into the blind hole of the limiting block, and the screw part of the adjusting rod cooperates with the nut; a locking mechanism is provided between the adjusting rod and the limiting block.

[0008] The present invention provides a bar stock rolling blank forming apparatus that uses a combination of roller plate and two rollers to roll the bar stock. The upper die is designed with a punch with an extrusion angle as a roller plate, and the lower die is designed with a rolling roller assembly consisting of two rolling rollers. As the punch descends, the spatial distance between its extrusion surface and the two rolling rollers gradually decreases until the designed compression amount is reached. That is, during the downward movement of the punch, the blank is moved laterally and rolled and gradually formed under the action of the rolling roller assembly. The bushing, punch, and blank shape are all conformed. Compared with the two-roller combination used in existing dedicated equipment, the combination of roller plate and two rollers disperses the extrusion force.

[0009] The rolling working part of the punch is designed as a wedge. The greater the inclination, the greater the deformation and the faster the deformation speed of the bar stock relative to the same vertical movement length; conversely, the smaller the deformation and the slower the deformation speed. The deformation of the bar stock is controlled by the effective vertical movement distance of the punch. The wedge-shaped punch design, synchronized with the roller design, ensures the synchronicity and precision of the deformation process.

[0010] To mitigate the stress concentration on the rolling roller, it is designed as a combination structure of a mandrel and a sleeve, with a small-clearance sliding assembly between the mandrel and the sleeve. The sleeve is easier to manufacture, maintain, and improve compared to the modular roll forging modules on existing dedicated equipment, and it is also smaller and lighter.

[0011] The punch and rolling roller can be designed according to the actual needs of bar stock rolling, and can be of different styles such as raised in the middle, recessed in the middle, or reverse conical. All accessories can be flexibly assembled and mold changed.

[0012] A water mist spraying device is designed at the rear of the rolling roller assembly to cool the mold.

[0013] As can be seen from the above, this invention can be performed using general-purpose stamping equipment such as punch presses or hydraulic presses, eliminating the need for specialized equipment such as roll forging machines and wedge rolling mills. This invention is simple to manufacture and install, has low maintenance costs, and while ensuring the quality of the billet, it also reduces labor costs and labor intensity. Compared to specialized equipment, this invention also has the following advantages:

[0014] (1) The present invention uses a combination of roller plate and two rollers, which results in fast extrusion speed and reduced blanking time;

[0015] (2) The lower mold can be pre-installed, without occupying the working time of the production equipment;

[0016] (3) The extrusion amount can be adjusted in a timely manner according to the punch pressing amount, and the installation and debugging are convenient;

[0017] (4) The sleeve shape and punch shape can be designed in a variety of shapes;

[0018] (5) It provides a prerequisite for introducing robots to assist production and realize the automation of product forging technology. Attached Figure Description

[0019] The accompanying drawings disclose specific embodiments of the present invention, wherein,

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a front view of the present invention;

[0022] Figure 3 This is a left-side view of the present invention;

[0023] Figure 4 This is a right-side view of the present invention;

[0024] Figure 5 This is a rear view of the present invention.

[0025] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0026] 1. Upper die base plate; 2. Punch; 3. Lower pressure rod; 4. Lower die base plate; 5. Positioning bracket; 501. Limiting guide groove; 6. Positioning wheel; 7. Bearing bracket; 8. Roller roller assembly; 81. Mandrel; 82. Sleeve; 9. Floating positioner; 91. Axial positioning assembly; 911. Adjusting rod; 912. Limiting block; 913. Pin; 92. Support rod; 93. Angle steel seat; 94. Spring; 10. Water mist spraying device; A. Bar stock. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The bar stock rolling and billet forming apparatus provided by the present invention includes an upper die and a lower die.

[0031] The upper die includes an upper die base plate 1, a punch 2, and a lower pressure rod 3. Both the punch 2 and the lower pressure rod 3 are fixed to the bottom of the upper die base plate 1 by screws. The punch 2 is a plate-shaped structure with a bevel.

[0032] The lower mold includes a lower mold base plate 4, a positioning bracket 5, positioning wheels 6, a bearing bracket 7, a rolling wheel assembly 8, and a floating positioner 9. The positioning bracket 5 and the bearing bracket 7 are both fixed to the upper part of the lower mold base plate 4 by screws.

[0033] A limiting guide groove 501 is provided on one side of the positioning bracket 5, which mates with the planar side of the punch 2. The limiting guide groove 501 is located below the punch 2. When the punch 2 moves downward, the limiting guide groove 501, through its engagement with the planar side of the punch 2, provides a limiting and guiding function for the punch 2. Positioning wheels 6 are symmetrically arranged on both sides of the limiting guide groove 501 on the positioning bracket 5. The positioning wheels 6 are hinged to the positioning bracket 5. Before operation, the bar stock A is placed on the lower die, above the positioning wheels 6, which support the bar stock A.

[0034] The support bracket 7 is located on one side of the positioning bracket 5, and the punch 2 is located between the positioning bracket 5 and the support bracket 7. The support bracket 7 is hinged to the side of the positioning bracket 5 with a rolling roller assembly 8. The rolling roller assembly 8 includes two rolling rollers, each of which is mainly composed of a spindle 81 and a sleeve 82. The two ends of the spindle 81 are hinged to the support bracket 7 through heavy-duty rolling bearings, and the sleeve 82 is in a small clearance sliding fit outside the spindle 81.

[0035] This invention employs a combination of a roller plate and two rollers to roll bar stock A. The upper die features a punch 2 with an extrusion angle, serving as the roller plate. The lower die has a roller assembly 8 consisting of two rolling rollers. As the punch 2 descends, the spatial distance between its extrusion surface and the two rolling rollers gradually decreases until the designed compression amount is achieved. Compared to the two-roller assembly used in existing specialized equipment, the combination of the roller plate and two rollers disperses the extrusion force.

[0036] The rolling working part of punch 2 is designed as a wedge. The greater the inclination, the greater the deformation of the bar stock and the faster the deformation speed in the direction of the same vertical movement length; conversely, the smaller the deformation of the bar stock and the slower the deformation speed. The deformation of the bar stock is controlled by the effective vertical movement distance of punch 2. The wedge structure of punch 2 is designed synchronously with the rollers to ensure the synchronicity and accuracy of the deformation process.

[0037] To mitigate the stress concentration on the rolling roller, it is designed as a combination structure of mandrel 81 and sleeve 82, with a small-clearance sliding assembly between the mandrel 81 and sleeve 82. Sleeve 82 is easier to manufacture, maintain, and improve than the modular roll forging modules on existing dedicated equipment, and it is also smaller and lighter. The heavy-duty rolling bearings at both ends of the mandrel 81 are used to reduce the rolling pressure on the mandrel 81.

[0038] Punch 2 and rolling roller can be designed according to the actual needs of the bar stock A rolling, or different styles such as raised in the middle, recessed in the middle, or reverse cone. All accessories can be flexibly assembled and mold changed.

[0039] Before operation, bar stock A is placed on the lower die, and the rolling roller group 8 and auxiliary positioning roller 6 limit and fix bar stock A.

[0040] The support bracket 7 is equipped with a water mist spraying device 10 on the side of the rolling roller group 8 away from the positioning bracket 5, which is used for cooling the mold.

[0041] A floating positioner 9 is positioned above the lower mold base plate 4 and below the lower pressure rod 3. The floating positioner 9 includes an axial positioning assembly 91, a support rod 92, an angle steel seat 93, and a spring 94. The support rod 92 is a bolt, passing through the lateral side of the angle steel seat 93 and threadedly fixed to the lower mold base plate 4; a clearance is provided between the support rod 92 and the angle steel seat 93; the spring 94 is fitted around the support rod 92 and is located between the angle steel seat 93 and the lower mold base plate 4. The axial positioning assembly 91 includes an adjusting rod 911, a limiting block 912, and a pin 913. The limiting block 912 is placed on the angle steel seat 93 and has a blind hole and a through hole that mates with the pin 913. The adjusting rod 911 includes a screw section and a smooth rod section at one end of the screw section, with an annular groove on the smooth rod section that mates with the pin 913. A nut is welded to the outer vertical side of the angle steel seat 93; the adjusting rod 911 passes through the vertical side of the angle steel seat 93 at one end of its smooth rod portion and is inserted into the blind hole of the limiting block 912, with the threaded portion of the adjusting rod 911 engaging with the nut. The pin 913 is inserted into the through hole of the limiting block 912 and engages with the annular groove of the adjusting rod 911, thereby locking the limiting block 912 and the adjusting rod 911 and preventing them from disengaging.

[0042] As can be seen, the adjustment rod 911 is manually rotated, and the adjustment rod 911, in conjunction with the nut, adjusts the position of the limiting block 912. When the limiting block 912 is in the installation position, the pin 913 locks the adjustment rod 911 and the limiting block 912. Thus, the floating positioner 9, through the axial positioning component 91, and the auxiliary positioning wheel 6 axially limit the bar stock A before the operation of this invention. When the upper die descends, the extrusion surface of the punch 2 contacts the bar stock A, and the lower pressure rod 3 extrudes the angle steel seat 93, causing the floating positioner 9 to descend and disengage from the bar stock A and remain in a disengaged state until the punch 2 retracts. At the same time, the extrusion surface of the punch 2 delivers the billet to the two rolling rollers. After the billet is rolled, the punch 2 moves upward, the billet is withdrawn from between the two rolling rollers, the floating positioner 9 returns to the starting position, and the billet is lifted up. The billet is then removed from the mold manually or by a robot.

[0043] The specific usage of this embodiment is as follows:

[0044] Before operation, this invention can be installed on general-purpose stamping equipment such as punch presses or hydraulic presses. During operation, the heated bar stock A is first placed on the positioning roller 6 of the lower die. Bar stock A rests against the two rolling rollers of the rolling roller assembly 8 and the sleeve 82 (below), and is axially limited by the limiting block 912 of the floating positioner 9. Next, the upper die is driven downwards, the pressing surface of the punch 2 contacts the bar stock A, and the lower pressing rod 3 presses the angle steel seat 93, causing the floating positioner 9 to descend and disengage from the bar stock A, remaining in a disengaged state until the punch 2 retracts. Simultaneously, the extrusion surface of punch 2 delivers the billet to the two rolling rollers, and the positioning roller 6 disengages from the bar stock A. Then, punch 2 continues to descend, and the extrusion surface of punch 2 cooperates with the two rolling rollers to rotate the billet, while gradually increasing the extrusion amount to the designed compression amount to complete the rolling. Afterward, the upper die is driven to move upward and reset, punch 2 moves upward, the billet is withdrawn from between the two rolling rollers, the floating positioner 9 returns to the starting position, and at the same time lifts the billet. The billet is then removed from the mold manually or by a robot, completing one processing action.

[0045] In summary, this invention can be performed using general-purpose stamping equipment such as punch presses or hydraulic presses, eliminating the need for specialized equipment such as roll forging machines or wedge rolling mills. This invention is simple to manufacture and install, has low maintenance costs, and while ensuring the quality of the blank, it also reduces labor costs and intensity. Compared to specialized equipment, this invention also has the following advantages:

[0046] (1) The present invention uses a combination of roller plate and two rollers, which results in fast extrusion speed and reduced blanking time;

[0047] (2) The lower mold can be pre-installed, without occupying the working time of the production equipment;

[0048] (3) The extrusion amount can be adjusted in a timely manner according to the punch pressing amount, and the installation and debugging are convenient;

[0049] (4) The sleeve shape and punch shape can be designed in a variety of shapes;

[0050] (5) The rollers are equipped with a cooling device to reduce the surface temperature of the mold;

[0051] (6) The workpiece does not touch the ground, which is conducive to on-site 5S management and the safety of personnel and facilities;

[0052] (7) It provides a prerequisite for introducing robots to assist production and realizing the automation of product forging technology.

Claims

1. A bar stock rolling and billet forming apparatus, comprising an upper die and a lower die, characterized in that, The upper die includes an upper die base plate (1), a punch (2), and a lower pressure rod (3); both the punch (2) and the lower pressure rod (3) are located below the upper die base plate (1); the punch (2) is a plate-shaped structure with a slope; the lower die includes a lower die base plate (4), a positioning bracket (5), a positioning wheel (6), a bearing bracket (7), a rolling wheel assembly (8), and a floating positioner (9); the positioning bracket (5), the bearing bracket (7), and the floating positioner (9) are located above the lower die base plate (4); a limiting guide groove (501) is provided on one side of the positioning bracket (5) to cooperate with the planar side of the punch (2), the limiting guide groove (501) is located below the punch (2); the positioning bracket (5) is also symmetrically provided with positioning wheels (6) on both sides of the limiting guide groove (501), and the positioning wheels (6) are hinged to the positioning bracket (5); the bearing bracket (7) is located on one side of the positioning bracket (5), and the punch (2) is located between the positioning bracket (5) and the bearing bracket (7); the bearing bracket (7) is hinged with a rolling wheel group (8) on the side of the positioning bracket (5) close to the positioning bracket (5); the floating positioner (9) is located below the pressure rod (3), and the floating positioner (9) moves up and down with the pressure rod (3); the floating positioner (9) includes an axial positioning component (91).

2. The bar stock rolling and billet forming apparatus according to claim 1, characterized in that, The roller assembly (8) includes two rollers, each roller consisting of a spindle (81) and a sleeve (82); the two ends of the spindle (81) are hinged to the bearing bracket (7) through bearings, and the sleeve (82) is slidably fitted outside the spindle (81) with a small clearance.

3. The bar stock rolling and billet forming apparatus according to claim 1, characterized in that, The bearing support (7) is provided with a water mist spraying device (10) on the side of the rolling roller assembly (8) away from the positioning support (5).

4. The bar stock rolling and billet forming apparatus according to claim 1, characterized in that, The floating positioner (9) also includes a support rod (92), an angle steel seat (93), and a spring (94); the support rod (92) passes through the lateral side of the angle steel seat (93) and is connected and fixed to the lower mold base plate (4); the spring (94) is fitted outside the support rod (92) and is located between the angle steel seat (93) and the lower mold base plate (4); the axial positioning assembly (91) includes an adjusting rod (911) and a limiting block (912); the limiting block (912) is set on the angle steel seat (93). Above, a blind hole is provided on the limiting block (912); the adjusting rod (911) includes a screw part and a smooth rod part provided at one end of the screw part; a nut is provided on the outer side of the vertical side of the angle steel seat (93); the adjusting rod (911) passes through the vertical side of the angle steel seat (93) through one end of the smooth rod part and is inserted into the blind hole of the limiting block (912), and the screw part of the adjusting rod (911) cooperates with the nut; a pin (913) is provided between the adjusting rod (911) and the limiting block (912).

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