Single roll arc rolling mill and rolling method

Abstract

The present application relates to metal plastic forming process and equipment technical field, provide a kind of single-roller arc rolling mill and rolling method, the single-roller arc rolling mill includes rack, arc die, cantilever roller system, die radial press unit, die pressing unit, feeding unit;The roller of cantilever roller system is driven by servo motor and installed on rack, arc die is oppositely arranged with cantilever roller system, arc die can move radially relative to roller, for adjusting the radial clearance between arc die and roller;Die radial press unit controls the radial movement amount of arc die relative to roller;Die pressing unit fixes arc die;Bar blank is sent from feeding unit to the starting rolling position of roller, after forming in die ends, fall into finished product box.The present application has the advantages of compact overall structure, without special guide plate, high degree of automation, high production efficiency, low production cost, etc., has certain application prospect.

Description

Technical Field

[0001] This invention relates to the field of metal plastic forming technology and equipment, and in particular to a single-roll arc rolling mill and rolling method. Background Technology

[0002] Bearings are widely used in mechanical manufacturing and are a crucial basic mechanical component. Rolling elements, as vital components of bearings, are subject to strict control in their production and quality control, which is essential for ensuring bearing quality. With the development of the manufacturing industry, the technical requirements for rolling element production are constantly increasing. High efficiency, high quality, and green manufacturing are the future development directions for bearing rollers.

[0003] Currently, there are two main methods for producing rolling elements in my country. One is upsetting, where cold upsetting is often used for rolling elements with a diameter less than 20mm, and hot upsetting is used for rolling elements with a diameter greater than 20mm. Upsetting produces high-quality products, but has low production efficiency and the problem of mold wear is difficult to solve. The other method is turning, which produces low-quality products, has high material consumption, and low productivity, and is used when the requirements are not high.

[0004] Compared with other forming methods, single-roll arc rolling can improve the quality of rolling elements. It eliminates the need for baffles during production, resulting in high productivity and no material loss, making it the future trend for rolling element production. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-roll arc rolling mill and rolling method. It adopts a single-roll arc cold rolling process and equipment, which eliminates the need for baffle structures and realizes automated feeding and discharging, which can significantly improve material utilization, facilitate automated production, and significantly improve production efficiency.

[0006] The present invention adopts the following technical solution:

[0007] On one hand, the present invention provides a single-roll arc rolling mill, comprising a frame, an arc die, a cantilever roll system, a die radial pressing unit, a die clamping unit, and a feeding unit;

[0008] The cantilevered roller system includes a roller that is cantilevered and mounted on the main shaft.

[0009] The arc-shaped die is disposed opposite to the cantilevered roll system. The arc-shaped die can move radially relative to the cantilevered roll system to adjust the radial clearance between the arc-shaped die and the roll. The arc-shaped die and the cantilevered roll system cooperate to roll the bar stock.

[0010] The radial pressing unit of the die is used to control the radial movement of the arc-shaped die relative to the roll;

[0011] The mold clamping unit is used to restrict the axial movement of the arc-shaped mold and fix the arc-shaped mold in a set position;

[0012] The feeding unit is used for placing and feeding the bar billet;

[0013] The arc-shaped mold, cantilever roller system, mold radial pressing unit, mold clamping unit, and feeding unit are all mounted on the frame.

[0014] In addition to any of the possible implementations described above, a further implementation is provided in which the cantilevered roll system includes rolls, bearings, a reducer, and a servo motor; the servo motor is connected to the reducer, both the reducer and the bearing are mounted on the frame, the main shaft is mounted inside the bearing, the reducer output shaft is connected to the main shaft via a key, and the rolls are mounted on the main shaft to provide rolling power.

[0015] In addition to any of the possible implementations described above, a further implementation is provided in which the arc-shaped mold is a concave mold, a circular mold is provided on the roll, the circular mold is a convex mold, the arc-shaped mold and the circular mold are arranged opposite to each other, and the roll surface includes at least two forming wedges extending circumferentially; the arc-shaped mold and the circular mold are each provided with corresponding semi-forming dies, and two corresponding semi-forming dies form a complete forming die, the forming die being used to cross-roll multiple rolling parts from a metal bar blank in one operation.

[0016] In addition to any of the possible implementations described above, another implementation is provided in which both the arc-shaped mold and the circular mold include a wedge section, a forming section, a transition section, and a separation section along the circumferential direction.

[0017] The wedge section is used for wedging the metal rod blank;

[0018] The forming section is used to form a bar blank into a plurality of rolling elements connected at their ends;

[0019] In the transition section, the circular mold is provided with a break-off boss that gradually rises in the direction perpendicular to the circumferential direction of the roller surface, and the arc-shaped mold is provided with a break-off recess corresponding to the break-off boss; the break-off boss and the break-off recess cooperate to subject adjacent rolling elements to bending force and generate and expand separation cracks in the connecting part.

[0020] The separating section is used to cut off the connection between adjacent rolling elements to form several separate rolling element parts.

[0021] In addition to any of the possible implementations described above, another implementation is provided in which the height of the protrusion of the forming wedge gradually increases from 0 to a first set height in the wedge insertion section, remains unchanged at the first set height in the forming section, remains unchanged at the first set height or gradually increases in the transition section, and the height of the protrusion continues to increase to a second set height in the separation section.

[0022] In addition to any of the possible implementations described above, another implementation is provided in which the angle at which the breaking boss is gradually raised along the circumferential direction perpendicular to the roller surface ranges from 0° to 5°-7°.

[0023] In addition to any of the possible implementations described above, a further implementation is provided in which the radial pressing unit of the mold includes an adjusting screw, a scale, and a wedge; the wedge and the adjusting screw are in a transmission relationship, and rotating the adjusting screw drives the wedge to move up and down, thereby adjusting the radial gap between the arc-shaped mold and the roll; the scale is used to measure the downward movement of the wedge.

[0024] In addition to any of the possible implementations described above, another implementation is provided in which the mold clamping unit includes a mold pressure plate and screws. After adjusting the position of the arc mold, the mold pressure plate is fixed with screws, and the pressure of the mold pressure plate ensures that the arc mold does not move axially.

[0025] In addition to any of the possible implementations described above, a further implementation is provided in which the single-roll arc mill further includes a base, the frame is mounted on the base, and a drainage device is provided on the base.

[0026] In addition to any of the possible implementations described above, a further implementation is provided in which the single-roll arc mill further includes a discharge unit, the discharge unit including an arc-shaped receiving bucket and a finished product box, the arc-shaped receiving bucket being located at the discharge end of the arc-shaped die and mounted on the frame using screws.

[0027] On the other hand, the present invention also provides a single-roll arc rolling method for rolling rolling elements, the method using the single-roll arc mill described above, the method comprising:

[0028] S1. Adjust the radial movement of the arc-shaped die relative to the roll by using the radial pressing unit of the die, so that the radial gap between the arc-shaped die and the roll matches the diameter of the bar billet;

[0029] S2. Fix the axial position of the arc-shaped mold by means of the mold clamping unit;

[0030] S3. The bar stock is placed into the feeding unit, and at the outlet of the feeding unit, the bar stock is sent to the starting rolling position of the rolls.

[0031] S4. Rolling begins. The bar billet is rolled into finished rolling parts through four stages: wedging, forming, transition, and separation.

[0032] Wedge insertion: The rollers drive the circular die to rotate, and the blank metal bar is pushed in through the feed port. When it comes into contact with the arc-shaped die, the metal bar begins to rotate and enters the wedge insertion section.

[0033] Forming: As the metal bar blank is rolled in, it is rolled into several rolling bodies connected at the ends under the action of the forming holes of the forming sections of the circular and arc-shaped dies;

[0034] Transition: In the transition section, the break-off boss gradually rises in the direction perpendicular to the circumferential direction of the roller surface, the bending force on the rolling element increases, and cracks appear and expand at the tip of the V-groove of the rolling element connection.

[0035] Separation: In the separation section, the adjacent rolling element connecting parts break and separate along the tip of the V-groove, and several rolling element parts are removed from the mold.

[0036] In addition to any of the possible implementations described above, another implementation is provided in which the number of forming wedges is greater than 2, and the number of rolling elements formed in one step is 3, 5, 7 or 9; rolling elements of different diameters are rolled by adjusting the distance between the arc-shaped die and the circular die set on the roll through the die radial pressing unit; and rolling elements of different lengths are rolled by adjusting the spacing between two adjacent forming wedges.

[0037] The beneficial effects of this invention are as follows:

[0038] 1. It adopts an arc-shaped structure, and the overall structure of the rolling mill is simple and has good stability.

[0039] 2. Compared with dual-power vertical rolling mills, arc-type rolling mills only require one servo motor drive, resulting in smaller overall equipment space and lower cost.

[0040] 3. Using special molds greatly improves forming efficiency.

[0041] 4. The arc-shaped structure is easy to automate and has high production efficiency. Attached Figure Description

[0042] Figure 1 The diagram shown is a structural schematic of a single-roll arc mill according to an embodiment of the present invention.

[0043] Figure 2 The diagram shown is a schematic representation of the radial pressing unit and the clamping unit of the mold in the embodiment.

[0044] Figure 3 The diagram shown illustrates the positional relationship between the arc-shaped mold and the rolling mill roll in the embodiment.

[0045] Figure 4The diagram shows the arc-shaped mold and the circular mold in the embodiment.

[0046] Figure 5 The diagram shown is a schematic of the rolling process of the bar billet in the mold in the embodiment.

[0047] Figure 6 The diagram shown is a schematic representation of the unfolded circular mold in the embodiment.

[0048] Figure 7 The figure shown is a cross-sectional schematic diagram of the broken boss of the circular mold in the embodiment.

[0049] Figure 8 The figure shown is a cross-sectional schematic diagram of the arc-shaped mold breakage recess in the embodiment.

[0050] Figure 9 The diagram shown is a structural schematic of the feeding unit in the embodiment.

[0051] In the diagram: 1-base; 2-frame; 3-die radial pressing unit; 4-die pressure plate; 5-hopper; 6-servo motor; 7-reducer; 8-cantilever roller system; 9-main shaft; 10-finished product box; 11-wedge block; 12-adjusting screw; 13-pressure cover; 14-roll; 15-arc die; 16-bar billet; 17-diial dial; 18-screw. Detailed Implementation

[0052] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be considered in isolation, but can be combined with each other to achieve better technical effects.

[0053] like Figures 1-3 As shown, an embodiment of the present invention provides a single-roll arc mill, including a frame 2, an arc die 15, a cantilever roll system 8, a die radial pressing unit 3, a die clamping unit, and a feeding unit;

[0054] The cantilevered roller system 8 includes a roller 14, which is mounted on the main shaft 9 in a cantilevered state.

[0055] The arc-shaped die 15 is disposed opposite to the cantilever roll system 8. The arc-shaped die 15 can move radially relative to the cantilever roll system 8 to adjust the radial gap between the arc-shaped die 15 and the roll 14. The arc-shaped die 15 and the cantilever roll system 8 cooperate to roll the bar stock 16.

[0056] The radial pressing unit 3 of the mold is used to control the radial movement of the arc mold 15 relative to the roll 14;

[0057] The mold clamping unit is used to restrict the axial movement of the arc mold 15 and fix the arc mold 15 in a set position.

[0058] The feeding unit is used for placing and feeding the bar stock 16;

[0059] The arc-shaped mold 15, the cantilever roller system 8, the mold radial pressing unit 3, the mold clamping unit, and the feeding unit are all mounted on the frame 2.

[0060] In one specific embodiment, the cantilevered roller system 8 includes a roller 14, a bearing, a reducer 7, and a servo motor 6; the servo motor 6 is connected to the reducer 7 (by bolts), the reducer 7 and the bearing are both mounted on the frame 2, the main shaft 9 is mounted inside the bearing, the output shaft of the reducer 7 is connected to the main shaft 9 by a key, and the roller 14 is mounted on the main shaft 9 to provide rolling power.

[0061] In one specific embodiment, the arc-shaped mold 15 is a concave mold, and a circular mold is provided on the roll 14. The circular mold is a convex mold, and the arc-shaped mold 15 and the circular mold are arranged opposite to each other. The roll surfaces each include at least two forming wedges extending circumferentially. Both the arc-shaped mold 15 and the circular mold are provided with corresponding semi-forming dies. Two corresponding semi-forming dies form a complete forming die. The forming die is used to cross-roll the metal rod blank 16 in one pass to obtain multiple rolling body parts. Figure 3 , Figure 4 As shown.

[0062] In one specific embodiment, both the arc-shaped mold 15 and the circular mold include a wedge-in section, a forming section, a transition section, and a separation section along the circumferential direction; the circular mold unfolds as follows: Figure 6 As shown;

[0063] The wedge section is used for wedging the metal rod blank 16;

[0064] The forming section is used to form the bar blank 16 into a plurality of rolling elements connected at their ends;

[0065] In the transition section, the circular mold is provided with a break-off boss that gradually rises in the direction perpendicular to the circumferential direction of the roller surface, and the arc-shaped mold 15 is provided with a break-off recess corresponding to the break-off boss; the break-off boss and the break-off recess cooperate to subject adjacent rolling elements to bending force and generate and expand separation cracks in the connecting part.

[0066] The separating section is used to cut off the connection between adjacent rolling elements to form several separate rolling element parts.

[0067] The rolling process of bar billet 16 in the die is as follows Figure 5 As shown.

[0068] In one specific embodiment, the height of the protrusion of the forming wedge gradually increases from 0 to a first set height in the wedge insertion section, remains unchanged at the first set height in the forming section, remains unchanged at the first set height or gradually increases in the transition section, and the height of the protrusion continues to increase to a second set height in the separation section.

[0069] In one specific embodiment, the angle at which the break-off boss gradually rises along the circumferential direction perpendicular to the roller surface ranges from 0° to 5°-7°. The break-off boss and break-off recess are as follows: Figure 7 , Figure 8 As shown.

[0070] In one specific embodiment, the mold radial pressing unit 3 includes an adjusting screw 12, a dial 17, and a wedge 11. The wedge 11 and the adjusting screw 12 are in a transmission relationship. Rotating the adjusting screw 12 causes the wedge 11 to move up and down, thereby adjusting the radial gap between the arc-shaped mold and the roll. The dial 17 can display the precise downward movement of the wedge 11.

[0071] like Figure 2 As shown, the adjusting screw 12 and the wedge block 11 are connected by threads. The inclined surface of the wedge block 11 and the inclined surface of the die plate 4 are in left-right contact. When the arc die needs to be adjusted to the right, the adjusting screw 12 is rotated, and the wedge block 11 moves downward. The inclined surface of the wedge block 11 pushes the die plate 4 and the arc die 15 to move to the right to achieve the adjustment position. In this embodiment, the die plate 4 and the arc die 15 are fixedly connected. When a jamming failure occurs during the rolling process, the adjusting screw 12 is rotated in the opposite direction, and the wedge block 11 moves upward, that is, the arc die 15 is unloaded and can be manually removed.

[0072] In one specific embodiment, such as Figure 2 As shown, the mold clamping unit includes a mold pressure plate 4 and screws 18. The mold pressure plate 4 can restrict the movement of the arc mold 15 in the axial direction. After the position of the arc mold 15 is adjusted, the mold pressure plate 4 is fixed with screws 18. The pressure of the mold pressure plate 4 ensures that the arc mold 15 does not move in the axial direction.

[0073] In one specific embodiment, the single-roll arc mill further includes a base 1, the frame 2 is mounted on the base 1, and a drainage device is provided on the base 1.

[0074] In one specific embodiment, the single-roll arc mill further includes a discharge unit, which comprises an arc-shaped receiving hopper and a finished product box 10, such as... Figure 1 As shown, the arc-shaped receiving bucket is located at the discharge end of the arc-shaped mold 15 and is mounted on the frame with screws.

[0075] On the other hand, the present invention also provides a single-roll arc rolling method for rolling rolling elements, the method using the single-roll arc mill described above, the method comprising:

[0076] S1. Adjust the radial movement of the arc-shaped die 15 relative to the roll 14 by means of the die radial pressing unit 3, so that the radial gap between the arc-shaped die 15 and the roll 14 matches the diameter of the bar billet 16.

[0077] S2. Fix the axial position of the arc-shaped mold 15 by means of the mold clamping unit;

[0078] S3. The billet 16 is placed into the feeding unit, and at the outlet of the feeding unit, the billet 16 is sent to the starting rolling position of the roll 14.

[0079] S4. Rolling begins. The bar billet 16 is rolled into finished rolling parts through four stages: wedging, forming, transition, and separation.

[0080] Wedge insertion: The roller 14 drives the circular mold to rotate, and the blank metal rod 16 is pushed in at the feed port. When it comes into contact with the arc mold 15, the metal rod 16 begins to rotate and enters the wedge insertion section.

[0081] Forming: As the metal bar blank 16 is rolled in, it is rolled into several rolling bodies connected at the ends under the action of the forming die and the forming section of the circular die and the arc die 15.

[0082] Transition: In the transition section, the break-off boss gradually rises in the direction perpendicular to the circumferential direction of the roller surface, the bending force on the rolling element increases, and cracks appear and expand at the tip of the V-groove of the rolling element connection.

[0083] Separation: In the separation section, the adjacent rolling element connecting parts break and separate along the tip of the V-groove, and several rolling element parts are removed from the mold.

[0084] See the overall rolling process. Figure 5 .

[0085] In one specific embodiment, the number of forming wedges is greater than 2, and the number of rolling elements formed in one step is 3, 5, 7 or 9; rolling elements of different diameters are rolled by adjusting the distance between the arc-shaped mold 15 and the circular mold set on the roll 14 through the mold radial pressing unit 3, and rolling elements of different lengths are rolled by adjusting the spacing between two adjacent forming wedges.

[0086] The working principle of this invention is as follows:

[0087] The roller 14 is driven by a servo motor 6 and a reducer 7 to rotate the main shaft 9. The power roller has a cantilever structure. The arc-shaped mold 15 is positioned by the mold radial pressing unit 3 and then fixed by the mold clamping unit. The mold radial pressing unit 3 ensures the mold clearance and is equipped with a scale plate for precise control of the mold clearance. This invention has the advantages of convenient roller changing, simple overall equipment structure, space and cost saving, and high production efficiency. It can be used for mass production of bearing rollers and threaded shaft parts.

[0088] While several embodiments of the present invention have been provided herein, those skilled in the art should understand that modifications can be made to these embodiments without departing from the spirit of the invention. The above embodiments are merely exemplary and should not be construed as limiting the scope of the invention.

Claims

1. A single-roll arc-shaped rolling mill, characterized in that, The single-roll arc mill includes a frame, an arc die, a cantilever roll system, a die radial pressing unit, a die clamping unit, and a feeding unit; The cantilevered roller system includes a roller that is cantilevered and mounted on the main shaft; The arc-shaped die is disposed opposite to the cantilevered roll system. The arc-shaped die can move radially relative to the cantilevered roll system to adjust the radial clearance between the arc-shaped die and the roll. The arc-shaped die and the cantilevered roll system cooperate to roll the bar stock. The radial pressing unit of the die is used to control the radial movement of the arc-shaped die relative to the roll; The mold clamping unit is used to restrict the axial movement of the arc-shaped mold and fix the arc-shaped mold in a set position; The feeding unit is used for placing and feeding the bar billet; The arc-shaped mold, cantilever roller system, mold radial pressing unit, mold clamping unit, and feeding unit are all mounted on the frame. The roll is provided with a circular mold, which is a convex mold. The arc mold and the circular mold are arranged opposite to each other. The roll surface includes at least two forming wedges extending circumferentially. The arc mold and the circular mold are provided with corresponding semi-forming dies. Two corresponding semi-forming dies form a complete forming die. The forming die is used to cross-roll a metal bar blank to obtain multiple rolling parts in one operation. Both the arc-shaped mold and the circular mold include a wedge section, a forming section, a transition section, and a separation section along the circumferential direction; The wedge section is used for wedging the metal rod blank; The forming section is used to form a bar blank into a plurality of rolling elements connected at their ends; In the transition section, the circular mold is provided with a break-off boss that gradually rises in the direction perpendicular to the circumferential direction of the roller surface, and the arc-shaped mold is provided with a break-off recess corresponding to the break-off boss; the break-off boss and the break-off recess cooperate to subject adjacent rolling elements to bending force and generate and expand separation cracks in the connecting part. The separating section is used to cut off the connecting part between adjacent rolling elements to form several separate rolling element parts; The radial pressing unit of the mold includes an adjusting screw, a scale, and a wedge; the wedge is driven by the adjusting screw, and rotating the adjusting screw drives the wedge to move up and down, thereby adjusting the radial gap between the arc-shaped mold and the roll; the scale is used to measure the downward movement of the wedge. The mold clamping unit includes a mold pressure plate and screws. After adjusting the position of the arc mold, the mold pressure plate is fixed with screws. The pressure of the mold pressure plate ensures that the arc mold does not move axially.

2. The single-roll arc mill as described in claim 1, characterized in that, The cantilevered roller system includes rollers, bearings, a reducer, and a servo motor. The servo motor is connected to the reducer, and both the reducer and the bearing are mounted on the frame. The main shaft is installed inside the bearing, and the output shaft of the reducer is connected to the main shaft via a key. The rollers are mounted on the main shaft to provide rolling power.

3. The single-roll arc mill as described in claim 1, characterized in that, The single-roll arc mill also includes a base, the frame is mounted on the base, and a drainage device is provided on the base.

4. The single-roll arc mill as described in claim 1, characterized in that, The single-roll arc mill also includes a discharge unit, which includes an arc-shaped receiving bucket and a finished product box. The arc-shaped receiving bucket is located at the discharge end of the arc-shaped mold and is mounted on the frame with screws.

5. A single-roll arc rolling method for rolling rolling elements, characterized in that, The method uses a single-roll arc mill as described in any one of claims 1-4, and the method includes: S1. Adjust the radial movement of the arc-shaped die relative to the roll by using the radial pressing unit of the die, so that the radial gap between the arc-shaped die and the roll matches the diameter of the bar billet; S2. Fix the axial position of the arc-shaped mold by means of the mold clamping unit; S3. The bar stock is placed into the feeding unit, and at the outlet of the feeding unit, the bar stock is pushed to the starting rolling position of the rolls. S4. Rolling begins. The bar billet is rolled into finished rolling parts through four stages: wedging, forming, transition, and separation. Wedge insertion: The rollers drive the circular die to rotate, and the blank metal bar is pushed in through the feed port. When it comes into contact with the arc-shaped die, the metal bar begins to rotate and enters the wedge insertion section. Forming: As the metal bar blank is rolled in, it is rolled into several rolling bodies connected at the ends under the action of the forming holes of the forming sections of the circular and arc-shaped dies; Transition: In the transition section, the break-off boss gradually rises in the direction perpendicular to the circumferential direction of the roller surface, the bending force on the rolling element increases, and cracks appear and expand at the tip of the V-groove of the rolling element connection. Separation: In the separation section, the adjacent rolling element connecting parts break and separate along the tip of the V-groove, and several rolling element parts are removed from the mold.

6. The single-roll arc rolling method as described in claim 5, characterized in that, The number of forming wedges is greater than 2, and the number of rolling elements formed in one step is 3, 5, 7 or 9. Rolling elements of different diameters are rolled by adjusting the distance between the arc-shaped die and the circular die set on the roll through the die radial pressing unit. Rolling elements of different lengths are rolled by adjusting the spacing between two adjacent forming wedges.

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