A forging press clamping device for shaft forging

Abstract

The present application relates to shaft forging processing technical field, specifically to a kind of forging press clamping device for shaft forging processing, it includes clamping seat, for being connected with the movement mechanism of forging press;Two oppositely arranged clamping arms, one end of each clamping arm is hinged with clamping seat;Clamping drive mechanism is connected between the clamping seat and clamping arm, for driving clamping arm swing, to clamp or release shaft blank;Floating clamp jaw, one end of each clamping arm away from clamping seat is provided with floating clamp jaw.The present application can change the line contact into surface contact, ensure the circumferential and axial positioning accuracy of shaft blank during forging, so that positioning block can actively enhance clamping force when forging impact occurs, avoid the circumferential and axial displacement of shaft blank, ensure the forging accuracy of shaft blank, while avoiding the deformation of positioning block due to high temperature when contacting high-temperature shaft blank, keep the clamping adhesion of positioning block and shaft blank during continuous forging.

Description

Technical Field

[0001] This invention relates to the field of shaft forging technology, and more specifically to a forging press clamping device for shaft forging. Background Technology

[0002] Shaft forging refers to a manufacturing technology that shapes shaft parts through forging processes. It utilizes forging machinery to apply pressure to heated metal blanks, causing them to undergo plastic deformation, thereby obtaining shaft blanks or finished products with higher strength, toughness, and fatigue resistance. It is commonly used to manufacture critical components that bear heavy loads, such as engine crankshafts and drive shafts.

[0003] In the drawing or upsetting processes of large shaft forgings, forging presses repeatedly and under heavy loads apply pressure to high-temperature shaft blanks using upper and lower anvils. Existing clamping devices are typically simple V-block or clamp structures, which present the following problems when clamping shaft blanks for forging:

[0004] The V-shaped block clamp structure has line contact or narrow surface contact with the surface of the high-temperature shaft blank. During forging, it needs to withstand a large axial force, which makes it prone to circumferential or axial sliding. It can also deform due to high temperature, resulting in displacement of the forging position, reduced fit between the clamping device and the high-temperature shaft blank, affecting the forging accuracy of the shaft blank, and causing unstable clamping. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a forging press clamping device for shaft forging, which effectively solves the problems of small contact area between the V-block or clamp structure and the high-temperature shaft blank, easy circumferential or axial sliding during forging, resulting in forging position deviation; and the change in shape of the clamping surface and decrease in fit after thermal expansion of the clamping device, further aggravating clamping instability and affecting forging accuracy.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a clamping device for a forging press used in shaft forging, comprising:

[0008] Clamping seat, used to connect with the motion mechanism of the forging press;

[0009] Two opposing clamping arms, one end of each clamping arm being hinged to a clamping seat;

[0010] A clamping drive mechanism is connected between the clamping seat and the clamping arm, and is used to drive the clamping arm to swing in order to clamp or release the shaft blank.

[0011] A floating gripper is provided at the end of each gripping arm away from the gripping seat. The floating gripper includes:

[0012] The claw body is fixedly connected to the clamping arm;

[0013] A positioning block is floatingly disposed on the side of the claw body facing the shaft blank, and is used to press against the circumferential surface of the shaft blank under the drive of the clamping arm. The surface of the positioning block facing the shaft blank is a concave arc surface.

[0014] Multiple anti-slip teeth are provided on the concave arc surface.

[0015] Furthermore, the floating gripper also includes:

[0016] An elastic reset component is disposed between the claw body and the positioning block, which is used to drive the positioning block to reset to the initial relative position with the claw body when the clamping arm releases the shaft blank;

[0017] The claw body has a guide groove on the side facing the positioning block, and a rectangular tube is slidably connected inside the guide groove. The positioning block is provided with a guide shaft that slidably engages with the rectangular tube.

[0018] Furthermore, the floating gripper also includes:

[0019] The wedge-shaped block is fixedly connected to the claw body;

[0020] The positioning block is provided with a transmission inclined block that abuts against the wedge block.

[0021] Further, the elastic reset member includes:

[0022] The first pressure spring is fixedly connected between the positioning block and the rectangular tube;

[0023] The second pressure spring is fixedly connected between the rectangular tube and the inner wall of the guide groove.

[0024] Furthermore, the anti-slip teeth extend along the axial direction of the shaft blank, and a plurality of the anti-slip teeth are arranged at intervals along the circumferential direction of the shaft blank. The cross-section of the anti-slip teeth is triangular, and the apex of the anti-slip teeth faces the circumferential surface of the shaft blank.

[0025] Furthermore, the floating gripper also includes:

[0026] Cooling channels are formed inside the positioning block;

[0027] The cooling channel has an inlet and an outlet disposed on the positioning block;

[0028] The cooling channel includes:

[0029] The cooling channel section is located inside the positioning block;

[0030] A liquid cooling pump is fixedly installed on the outer wall of the claw.

[0031] A flexible connecting pipe is used to connect the liquid cooling pump to the inlet and outlet of the cooling channel section.

[0032] Furthermore, the clamping drive mechanism includes:

[0033] A hydraulic cylinder, wherein the cylinder body of the hydraulic cylinder is hinged to the clamping seat, and the piston rod of the hydraulic cylinder is hinged to the clamping arm;

[0034] A locking assembly is disposed between the cylinder body and the piston rod; the locking assembly includes:

[0035] A locking sleeve is fixedly connected to the cylinder body. A front locking block is rotatably connected to the inner wall of the locking sleeve, and a rear locking block is fixedly connected to the inner wall of the locking sleeve.

[0036] The stop block is fixedly connected to the piston rod.

[0037] Furthermore, the locking component also includes:

[0038] A perforation is formed on the front locking block, and the abutment slides with the front locking block through the perforation;

[0039] A drive motor is fixedly connected to the outer peripheral wall of the locking sleeve. A gear is fixedly connected to the output end of the drive motor. An arc-shaped toothed plate that meshes with the gear is fixedly connected to the outer peripheral wall of the front locking block. A movable hole is opened on the side wall of the locking sleeve. The arc-shaped toothed plate slides with the side wall of the locking sleeve through the movable hole.

[0040] The technical solution provided by this invention has the following advantages compared with the known prior art:

[0041] In this invention, a floating gripper is provided. When the gripping arm drives the floating gripper to swing in an arc, the positioning block can adaptively float relative to the gripper body along the radial direction of the shaft blank. This allows the concave arc surface of the positioning block to gradually conform to the circumferential surface of the shaft blank during the gripping process, thereby changing the line contact of the gripping into a surface contact and ensuring the circumferential and axial positioning accuracy of the shaft blank during the forging process.

[0042] In this invention, a wedge block and a transmission inclined block are provided. When the shaft blank is subjected to the axial impact force of forging, the axial impact force is transmitted to the transmission inclined block through the positioning block. The inclined surfaces of the transmission inclined block and the wedge block cooperate to convert the axial impact force into a radial force acting on the positioning block. The radial force drives the positioning block to move further towards the shaft blank, so that the clamping force of the positioning block on the shaft blank is positively correlated with the axial impact force of forging. This allows the positioning block to actively enhance the clamping force when the forging impact occurs, avoid circumferential and axial displacement of the shaft blank, and ensure the forging accuracy of the shaft blank.

[0043] In this invention, a cooling channel is provided. By opening the cooling channel inside the positioning block and setting an elastic connecting pipe to connect the liquid cooling pump and the cooling channel section, the coolant forms a circulating flow inside the positioning block, so as to continuously remove the heat of the positioning block and prevent the positioning block from deforming due to excessive temperature when it comes into contact with the high-temperature shaft blank, thus maintaining the clamping fit between the positioning block and the shaft blank during the continuous forging process.

[0044] In this invention, a locking assembly is provided. When the shaft blank is subjected to the axial impact force of forging and transmitted to the piston rod through the clamping arm, the retraction tendency of the piston rod drives the abutment block to move. The abutment block forms abutment limit with the front locking block and the rear locking block respectively, so as to restrict and fix the piston rod, block the further transmission of the impact force to the hydraulic cylinder, and realize the bidirectional locking of the piston rod. With the help of the floating jaw, a double clamping and locking of the shaft blank can be formed, thereby ensuring the stability of the clamping posture of the clamping device at the moment of forging impact, and further ensuring the forging accuracy of the shaft blank. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0046] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0047] Figure 2 This is a schematic diagram of the clamping arm structure in this invention;

[0048] Figure 3 This is a schematic diagram of the floating gripper structure in this invention;

[0049] Figure 4 This is a cross-sectional view of the claw body structure in this invention;

[0050] Figure 5 This is a schematic diagram of the positioning block structure in this invention;

[0051] Figure 6 This is a schematic diagram of the hydraulic cylinder structure in this invention;

[0052] Figure 7 This is a cross-sectional view of the locking sleeve portion structure in this invention;

[0053] Figure 8 These are exploded and sectional views of the piston rod structure in this invention;

[0054] Figure 9 This is a cross-sectional view of the positioning block structure in this invention.

[0055] Reference numerals: 1. Clamping seat; 2. Clamping arm; 3. Clamping drive mechanism; 31. Hydraulic cylinder; 311. Cylinder body; 312. Piston rod; 32. Locking assembly; 321. Through hole; 322. Drive motor; 323. Gear; 324. Arc-shaped toothed plate; 325. Movable hole; 33. Locking sleeve; 331. Front locking block; 332. Rear locking block; 34. Abutment block; 4. Floating gripper; 41. Grip body; 42. Positioning block; 43. Concave arc surface; 44. Anti-slip teeth; 45. Elastic reset component; 451. First pressure spring; 452. Second pressure spring; 46. Guide groove; 47. Rectangular cylinder; 48. Guide shaft; 49. Wedge block; 410. Transmission inclined block; 411. Cooling channel; 4111. Cooling channel section; 4112. Liquid cooling pump; 4113. Elastic connecting pipe; 412. Inlet; 413. Outlet. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0057] The present invention will be further described below with reference to embodiments.

[0058] Example 1

[0059] Reference Figures 1 to 8 A forging press clamping device for shaft forging includes a clamping seat 1, two oppositely arranged clamping arms 2, a clamping drive mechanism 3, and floating jaws 4.

[0060] The clamping base 1 is fixedly connected to the motion mechanism of the forging press, such as the feeding mechanism, to move or rotate the clamping device as a whole. Two clamping arms 2 are arranged opposite each other, with one end of each clamping arm 2 hinged to the clamping base 1 via a pin, allowing the clamping arm 2 to swing around the hinge point. A clamping drive mechanism 3 is connected between the clamping base 1 and the clamping arms 2, used to drive the clamping arms 2 to swing, thereby achieving the action of clamping or releasing the shaft blank.

[0061] Each clamping arm 2 is equipped with a floating gripper 4 at its end away from the clamping seat 1. The floating gripper 4 includes a gripper body 41, a positioning block 42, and multiple anti-slip teeth 44. The positioning block 42 is floatingly disposed on the side of the gripper body 41 facing the shaft blank, and is used to directly press against the circumferential surface of the shaft blank under the drive of the clamping arm 2. The surface of the positioning block 42 facing the shaft blank is configured as a concave arc surface 43, the radius of curvature of which matches the diameter range of the shaft blank to be clamped, to increase the contact area. Multiple anti-slip teeth 44 are disposed on the concave arc surface 43 to increase the coefficient of friction and prevent the shaft blank from sliding.

[0062] The anti-slip teeth 44 extend axially along the shaft blank, and multiple anti-slip teeth 44 are arranged at intervals along the circumference of the shaft blank. The cross-section of the anti-slip teeth 44 is triangular, and the apex of the anti-slip teeth 44 faces the circumferential surface of the shaft blank. During the clamping process, the anti-slip teeth 44 can embed into the oxide scale or tiny unevenness on the surface of the shaft blank, forming an effective anti-slip resistance, while avoiding serious scratches on the shaft blank substrate.

[0063] Example 2

[0064] The floating gripper 4 also includes an elastic reset member 45. A guide groove 46 is provided on the side of the gripper body 41 facing the positioning block 42, and a rectangular tube 47 is slidably connected to the inner side of the guide groove 46. A guide shaft 48 is provided on the positioning block 42 that slidably engages with the rectangular tube 47.

[0065] Specifically, one end of the guide shaft 48 is fixed to the positioning block 42, and the other end extends into the rectangular tube 47 and can slide along the axial direction of the rectangular tube 47. The elastic reset member 45 is disposed between the claw body 41 and the positioning block 42, and is used to drive the positioning block 42 to reset to the initial relative position with the claw body 41 when the clamping arm 2 releases the shaft blank.

[0066] The elastic reset component 45 includes a first pressure spring 451 and a second pressure spring 452. The first pressure spring 451 is fixedly connected between the positioning block 42 and the rectangular tube 47, specifically sleeved on the guide shaft 48, with one end abutting against the positioning block 42 and the other end abutting against the inner end face of the rectangular tube 47. The second pressure spring 452 is fixedly connected between the rectangular tube 47 and the inner wall of the guide groove 46, with one end abutting against the outer end face of the rectangular tube 47 and the other end abutting against the bottom of the guide groove 46. By setting the first pressure spring 451 and the second pressure spring 452, not only is the floating reset function of the positioning block 42 realized, but a double buffering effect is also provided, which can effectively absorb the impact load at the moment of clamping the shaft blank.

[0067] The floating gripper 4 also includes a wedge block 49 and a transmission inclined block 410. The wedge block 49 is fixedly connected to the gripper body 41, and the transmission inclined block 410 is disposed on the positioning block 42 and abuts against the wedge block 49. When the shaft blank is subjected to the axial impact force of forging, the axial impact force is transmitted to the transmission inclined block 410 through the positioning block 42. The inclined surface of the transmission inclined block 410 and the wedge block 49 cooperate to convert the axial impact force into a radial force acting on the positioning block 42. The radial force drives the positioning block 42 to move further towards the shaft blank, so that the clamping force of the positioning block 42 on the shaft blank is positively correlated with the axial impact force of forging. This allows the positioning block 42 to actively enhance the clamping force when the forging impact occurs, avoiding circumferential and axial displacement of the shaft blank and ensuring the forging accuracy of the shaft blank.

[0068] Example 3

[0069] The floating gripper 4 also includes a cooling channel 411 formed inside the positioning block 42. The cooling channel 411 has an inlet 412 and an outlet 413 located on the positioning block 42. The cooling channel 411 includes a cooling channel section 4111, a liquid cooling pump 4112, and a flexible connecting pipe 4113. The cooling channel section 4111 is formed in a meandering manner inside the positioning block 42 to increase the heat exchange area. The liquid cooling pump 4112 is fixedly mounted on the outer wall of the gripper body 41. The flexible connecting pipe 4113 connects the liquid cooling pump 4112 to the inlet 412 and outlet 413 of the cooling channel section 4111. The flexible connecting pipe 4113 is made of high-temperature resistant metal flexible hose to accommodate displacement changes when the positioning block 42 floats.

[0070] During operation, the liquid cooling pump 4112 drives the coolant, which can be heat transfer oil, to form a circulating flow inside the positioning block 42, so as to continuously remove the heat of the positioning block 42 and prevent the positioning block 42 from deforming due to excessive temperature when in contact with the high-temperature shaft blank, thus maintaining the clamping fit between the positioning block 42 and the shaft blank during the continuous forging process.

[0071] Example 4

[0072] The clamping drive mechanism 3 includes a hydraulic cylinder 31 and a locking assembly 32. The cylinder body 311 of the hydraulic cylinder 31 is hinged to the clamping seat 1, and the piston rod 312 of the hydraulic cylinder 31 is hinged to the clamping arm 2. The locking assembly 32 is disposed between the cylinder body 311 and the piston rod 312.

[0073] Specifically, the locking assembly 32 includes a locking sleeve 33 and a stop block 34. The locking sleeve 33 is fixedly connected to the cylinder body 311, and a front locking block 331 is rotatably connected to the inner wall of the locking sleeve 33. A rear locking block 332 is also fixedly connected to the inner wall of the locking sleeve 33. The stop block 34 is fixedly connected to the piston rod 312. A through hole 321 is provided on the front locking block 331, and the stop block 34 slides with the front locking block 331 through the through hole 321. A drive motor 322 is fixedly connected to the outer peripheral wall of the locking sleeve 33, and a gear 323 is fixedly connected to the output end of the drive motor 322. An arc-shaped toothed plate 324 that meshes with the gear 323 is fixedly connected to the outer peripheral wall of the front locking block 331. A movable hole 325 is provided on the side wall of the locking sleeve 33, and the arc-shaped toothed plate 324 slides with the side wall of the locking sleeve 33 through the movable hole 325.

[0074] When the hydraulic cylinder 31 drives the piston rod 312 to extend or retract, causing the clamping arm 2 to swing and complete the clamping, the drive motor 322 starts and drives the arc-shaped toothed plate 324 to rotate through the gear 323, thereby causing the front locking block 331 to rotate at a certain angle. At this time, the through hole 321 on the front locking block 331 is misaligned with the abutment block 34, and the solid part of the front locking block 331 prevents the abutment block 34 from retracting. At the same time, the rear locking block 332 restricts the excessive extension of the abutment block 34, thereby realizing the bidirectional mechanical locking of the piston rod 312. With the help of the floating gripper 4, a double clamping and locking of the shaft blank can be formed, thereby ensuring the stability of the clamping posture of the clamping device at the moment of forging impact, and further ensuring the forging accuracy of the shaft blank.

[0075] The working principle of this invention is as follows:

[0076] When clamping the shaft blank is required, the motion mechanism of the forging press moves the clamping device to the position of the shaft blank. The hydraulic cylinder 31 of the clamping drive mechanism 3 is activated, the piston rod 312 extends and drives the two clamping arms 2 to swing towards each other. The floating jaw 4 moves with the clamping arms 2, and the concave arc surface 43 of the positioning block 42 first contacts the circumferential surface of the shaft blank. During the contact process, the positioning block 42, according to the actual diameter and surface shape of the shaft blank, slides along the rectangular cylinder 47 via the guide shaft 48 and the rectangular cylinder 47 slides along the guide groove 46, achieving adaptive floating adjustment, so that the concave arc surface 43 fits tightly with the surface of the shaft blank. At the same time, the anti-slip teeth 44 press against the surface of the shaft blank, providing sufficient friction.

[0077] During the forging process of the shaft blank, the shaft blank is subjected to axial impact force and acts on the positioning block 42. The wedge block 49 and the transmission inclined block 410 interact to generate additional clamping force, making the positioning block 42 clamp the shaft blank more firmly. In the clamping state, the locking assembly 32 mechanically locks the piston rod 312 of the hydraulic cylinder 31 to prevent the clamping force from weakening. At the same time, the liquid cooling pump 4112 starts, and the coolant circulates in the cooling channel section 4111 to cool the positioning block 42.

[0078] When the blank needs to be released, the locking assembly 32 releases the locking limit of the abutment block 34, the piston rod 312 of the hydraulic cylinder 31 retracts, and the clamping arm 2 swings in the opposite direction. Under the combined action of the first pressure spring 451 and the second pressure spring 452 of the elastic reset member 45, the positioning block 42 returns to its initial relative position with the claw body 41, completing one clamping cycle.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A clamping device for a forging press used in shaft forging, characterized in that, include: Clamping seat (1) is used to connect with the motion mechanism of the forging press; Two opposing clamping arms (2), one end of each clamping arm (2) is hinged to the clamping seat (1); The clamping drive mechanism (3) is connected between the clamping seat (1) and the clamping arm (2) and is used to drive the clamping arm (2) to swing so as to clamp or release the shaft blank; Floating grippers (4), each of the gripping arms (2) is provided with a floating gripper (4) at one end away from the gripping seat (1), the floating gripper (4) comprising: The claw body (41) is fixedly connected to the clamping arm (2); The positioning block (42) is floatingly disposed on the side of the claw body (41) facing the shaft blank, and is used to press against the circumferential surface of the shaft blank under the drive of the clamping arm (2). The surface of the positioning block (42) facing the shaft blank is a concave arc surface (43). Multiple anti-slip teeth (44) are provided on the concave arc surface (43); The floating gripper (4) also includes: An elastic reset member (45) is disposed between the claw body (41) and the positioning block (42) for driving the positioning block (42) to reset to the initial relative position with the claw body (41) when the clamping arm (2) releases the shaft blank; The claw body (41) has a guide groove (46) on the side facing the positioning block (42), and a rectangular tube (47) is slidably connected inside the guide groove (46). The positioning block (42) is provided with a guide shaft (48) that slidably engages with the rectangular tube (47). The floating gripper (4) also includes: A wedge-shaped block (49) is fixedly connected to the claw body (41); The positioning block (42) is provided with a transmission inclined block (410) that abuts against the wedge block (49). The elastic reset member (45) includes: The first pressure spring (451) is fixedly connected between the positioning block (42) and the rectangular tube (47); The second pressure spring (452) is fixedly connected between the rectangular tube (47) and the inner wall of the guide groove (46).

2. The clamping device for a forging press used in shaft forging according to claim 1, characterized in that, The anti-slip teeth (44) extend along the axial direction of the shaft blank, and a plurality of the anti-slip teeth (44) are arranged at intervals along the circumference of the shaft blank. The cross-section of the anti-slip teeth (44) is triangular, and the apex of the anti-slip teeth (44) faces the circumferential surface of the shaft blank.

3. The clamping device for a forging press in shaft forging according to claim 1, characterized in that, The floating gripper (4) also includes: Cooling channels (411) are formed inside the positioning block (42); The cooling channel (411) has an inlet (412) and an outlet (413) provided on the positioning block (42). The cooling channel (411) includes: Cooling flow channel section (4111) is formed inside the positioning block (42); A liquid cooling pump (4112) is fixedly installed on the outer wall of the claw body (41); A flexible connecting pipe (4113) is connected between the inlet (412) and outlet (413) of the liquid cooling pump (4112) and the cooling flow channel section (4111).

4. The clamping device for a forging press for shaft forging according to claim 1, characterized in that, The clamping drive mechanism (3) includes: Hydraulic cylinder (31), the cylinder body (311) of the hydraulic cylinder (31) is hinged to the clamping seat (1), and the piston rod (312) of the hydraulic cylinder (31) is hinged to the clamping arm (2); A locking assembly (32) is disposed between the cylinder (311) and the piston rod (312); The locking component (32) includes: A locking sleeve (33) is fixedly connected to the cylinder body (311). A front locking block (331) is rotatably connected to the inner wall of the locking sleeve (33), and a rear locking block (332) is fixedly connected to the inner wall of the locking sleeve (33). The abutment block (34) is fixedly connected to the piston rod (312).

5. The clamping device for a forging press in shaft forging according to claim 4, characterized in that, The locking assembly (32) further includes: A perforation (321) is provided on the front locking block (331), and the abutment (34) slides with the front locking block (331) through the perforation (321); A drive motor (322) is fixedly connected to the outer peripheral wall of the locking sleeve (33). A gear (323) is fixedly connected to the output end of the drive motor (322). An arc-shaped toothed plate (324) that meshes with the gear (323) is fixedly connected to the outer peripheral wall of the front locking block (331). A movable hole (325) is opened on the side wall of the locking sleeve (33). The arc-shaped toothed plate (324) slides with the side wall of the locking sleeve (33) through the movable hole (325).

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