A forging tool and forging method for a large flange die for a large shaft end with a large shaft diameter ratio

Abstract

The present invention relates to a die forging tool and a forging method for a large flange at the end of an end shaft with a large shaft diameter ratio. The forging tool comprises an upper jaw body and a lower jaw body. The upper jaw body is provided with a mounting hole whose axis is parallel to the end shaft. The front and rear sides of the upper jaw body are respectively provided with pin holes. A support platform extending outward from the side of the jaw body is provided below the pin hole. The top surface of the support platform is provided with a downwardly concave arc. An arm is passed through the mounting hole. The arm comprises an arm rod extending into the mounting hole and a clamping block fixed to one end of the arm rod. The clamping block is provided with a clamping arc facing the large flange at the end of the shaft and matching the outer diameter of the large flange at the end of the shaft. The tooling of the present invention is simple to manufacture and has a large opening space. It can be extended under a movable crossbeam for rotation operation. It is suitable for clamping forgings with larger diameters and smaller cross-sectional thicknesses. It saves a large number of gasket sets and does not need to manufacture a special rotating platform with holes. It reduces the labor intensity of workers and improves production efficiency, thereby improving economic benefits.

Description

Technical Field

[0001] The invention relates to the technical field of forging production, and in particular to a die forging tool and a forging method for a large flange die at an end shaft with a large shaft diameter ratio. Background Art

[0002] The end shaft forgings with large end face and large shaft diameter ratio include large wind turbine main shafts, operating side and transmission side shaft heads on papermaking machinery, etc. The large flange diameter of the shaft end is between 1000 and 2000 mm, the flange thickness is between 120-300 mm, and the total length of the shaft body is between 2000 and 4000 mm. The forging of the end shaft generally adopts the method of first drawing the shaft body and then forging the shaft end flange with a tire mold. This method uses too many tooling, such as gasket sets, special rotating platforms with holes, tire molds, etc., and is limited by the stroke of the press, so it is not easy to achieve a longer end shaft. If the large flange of the shaft end is forged first, and then the slender shaft body is drawn, after the fish-mouth jaws of the forging operator clamp the outer diameter of the shaft end flange, due to the thin thickness of the flange, the clamping is unstable, and it is difficult to draw the shaft body from the root where the flange and the shaft body are connected, and the jaw opening is large. During rotary forging, it is limited by the space of the press column and the movable crossbeam of the press, and the end shaft forming is difficult to achieve. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a forging tool and a forging method for a large flange die for an end shaft with a large shaft diameter ratio. The tool has stable clamping and a large rotation operation space, can forge various types of end shaft forgings, and uses fewer molds and tooling.

[0004] The present invention is achieved through the following technical scheme, which provides a die forging tool for a large flange at the end of a shaft with a large shaft diameter ratio, comprising an upper jaw body and a lower jaw body symmetrically mounted on an operating machine, the upper jaw body being provided with a mounting hole whose axis is parallel to the end shaft, the front and rear sides of the upper jaw body being respectively provided with pin holes which extend relatively and are perpendicular to the mounting hole, a support platform extending outward from the side of the jaw body being provided below the pin hole, the top surface of the support platform being provided with a downwardly concave arc; an arm is passed through the mounting hole, the arm comprising an arm rod extending into the mounting hole and a clamping block fixed to one end of the arm rod, the clamping block being provided with a clamping arc which faces the large flange at the end of the shaft and matches the outer diameter of the large flange at the end of the shaft.

[0005] In this solution, arms are inserted into the upper jaw body and the lower jaw body through mounting holes, and the two arms form a clamping force on the shaft end flange, which facilitates the installation and replacement of the arms. By setting pin holes and support platforms, the upper jaw body and the lower jaw body are installed on the operating machine by inserting pin shafts, and supported by the support platform, which works together with the pin shaft to ensure the reliability of the fixation of the upper jaw body and the lower jaw body; the arms are installed in the mounting holes through arm rods, and the shaft end flanges are clamped by the clamping arcs of the two clamping blocks, which increases the contact area between the clamping blocks and the flanges, ensuring sufficient clamping force, and the upper and lower anvils of the press can be close to the root of the flange to avoid interference with the movable crossbeam of the press when the operating machine drives the jaw bodies to rotate.

[0006] As an optimization, the top surface of the upper jaw body is provided with a limit platform extending upward. By providing the limit platform, the upper jaw body is limited from excessively moving outward, and the upper jaw body and the lower jaw body are symmetrically arranged, thereby avoiding an excessively large clamping opening and ensuring that the movable crossbeam of the press is not restricted during rotary forging.

[0007] As an optimization, the mounting hole penetrates the upper jaw body in the axial direction. This optimization solution makes the mounting of the arm more secure and not easy to fall off, and reduces the difficulty of processing the mounting hole.

[0008] As an optimization, the arm and the clamping block are an integrated piece. The arm and the clamping block of this optimization solution are an integrated piece, which improves the structural strength of the arm and provides the possibility of increasing the clamping force.

[0009] As an optimization, the arm is a round rod. The arm of this optimization solution is a round rod, which reduces the difficulty of processing the arm, and the arm can be rotated during the clamping process so that the clamping arc is completely fitted with the flange, reducing the installation requirements of the arm angle.

[0010] As an optimization, the projection of the arc top of the clamping arc along the axial direction of the arm is located within the cross section of the arm. The setting of this optimization scheme avoids interference between the arm and the press, ensuring the smooth progress of the rotary forging.

[0011] As an optimization, the width of the clamping block along the length direction of the arm is 1 to 2 times the thickness of the large flange at the shaft end. The optimized clamping block thickness setting makes the upper and lower anvils of the press closer to the flange root when forging the shaft body, and the jaws of the operating machine will not touch the movable crossbeam of the press when rotating, ensuring the smooth progress of forging.

[0012] A method for forging using the forging tool comprises the following steps:

[0013] (1) The heated blank is upset and stretched, the upset and stretched blank is placed in a special tire mold, the large flange at the end of the end shaft is forged on a press, and then demolded;

[0014] (2) Install the upper jaw body and the lower jaw body on the manipulator through the pin holes and the support platform, and then insert the arm rods of the two arms into the mounting holes of the upper jaw body and the lower jaw body respectively, and make the two clamping arcs face each other;

[0015] (3) The operating machine drives the upper jaw body and the lower jaw body to move relative to each other, so that the two clamping arcs clamp the outer cylindrical surface of the large flange at the shaft end. The outer cylindrical surface of the large flange is completely in contact with the clamping arc, the contact area is large, and the clamping is firm;

[0016] (4) Pull out the long shaft on the anvil;

[0017] (5) The end shaft is forged. During forging, the operator drives the upper jaw body and the lower jaw body to rotate as a whole, thereby driving the end shaft to rotate, making the forged end shaft more uniform.

[0018] The beneficial effects of the present invention are:

[0019] 1. The tooling is simple to make, with a large opening space, and can be inserted under the movable beam for rotation operation, which is suitable for clamping forgings with larger diameters and smaller cross-section thicknesses;

[0020] 2. The forging operation is simple. After the large flange at the shaft end is forged in the die, the upper and lower anvils can be used to lengthen the shaft body. Compared with the usual practice, it saves a large number of gasket sets and does not need to make a special rotating platform with holes, which reduces the labor intensity of workers, reduces production costs, improves production efficiency, and thus improves economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is the front view of the upper jaw body;

[0023] Figure 3 for Figure 2 Left view of

[0024] Figure 4 for Figure 2 A top view of

[0025] Figure 5 This is the front view of the arm;

[0026] Figure 6 for Figure 5 Right view of;

[0027] Figure 7 for Figure 5 A top view of

[0028] As shown in the figure:

[0029] 1. Upper jaw body, 11. Mounting hole, 12. Support platform, 13. Limit platform, 14. Pin hole, 2. Lower jaw body, 3. Arm, 31. Arm rod, 32. Clamping block, 4. Press movable crossbeam, 5. Upper anvil, 6. Large flange at shaft end, 7. Lower anvil. DETAILED DESCRIPTION

[0030] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0031] like Figure 1 The forging tooling for a large flange die at the end of a shaft with a large shaft diameter ratio is shown, comprising an upper jaw body 1 and a lower jaw body 2 symmetrically mounted on an operating machine. The operating machine can drive the upper jaw body 1 and the lower jaw body 2 to move relative to and away from each other, and can also drive the upper jaw body 1 and the lower jaw body 2 to rotate as a whole to rotate the end shaft and realize rotary forging. The operating machine adopts existing technology.

[0032] The upper jaw body 1 is provided with a mounting hole 11 whose axis is parallel to the end axis. The mounting hole 11 penetrates the upper jaw body axially. The front and rear sides of the upper jaw body are respectively provided with pin holes 14 extending relatively and perpendicular to the mounting hole. Below the pin hole is provided a support platform 12 extending outward from the side of the jaw body. The top surface of the support platform 12 is provided with a concave arc. During installation, the upper jaw body is connected to the execution part of the manipulator using a pin shaft passing through the pin hole, and the arc on the support platform is clamped on the corresponding mounting axis of the manipulator to prevent the upper jaw body from rotating around the pin shaft.

[0033] The top surface of the upper jaw body is provided with a limit platform 13 extending upward. The limit platform 13 is provided when passing through to prevent the clamping opening from being too large and interfering with the movable crossbeam 4 of the press.

[0034] An arm 3 is penetrated in the mounting hole 11, and the arm 3 includes an arm rod 31 extending into the mounting hole and a clamping block 32 fixed to one end of the arm rod. The arm rod is a round rod, and the mounting hole is a round hole. The clamping block 32 is provided with a clamping arc facing the large flange 6 at the shaft end and adapted to the outer diameter of the large flange at the shaft end. The projection of the arc top of the clamping arc along the axial direction of the arm rod is located in the cross section of the arm rod, and the width of the clamping block along the length direction of the arm rod is 1 to 2 times the thickness of the large flange at the shaft end.

[0035] In order to improve the strength of the arm, the arm rod 31 and the clamping block 32 of this embodiment are integrated.

[0036] The method for forging using the forging tool of this embodiment includes the following steps:

[0037] 1. The heated blank is upset and stretched, and the upset and stretched blank is placed in a special tire mold, and the large flange at the end of the end shaft is forged on the press, and then demolded;

[0038] 2. Install the upper jaw body and the lower jaw body on the manipulator through the pin holes and the support platform, and then insert the arm rods of the two arms into the mounting holes of the upper jaw body and the lower jaw body respectively, and make the two clamping arcs face each other;

[0039] 3. The manipulator drives the upper jaw body and the lower jaw body to move relative to each other, so that the two clamping arcs clamp the outer cylindrical surface of the large flange at the shaft end. The outer cylindrical surface of the large flange is completely in contact with the clamping arc, with a large contact area and a firm clamping;

[0040] 4. Pull out the shaft body on the anvil, and use the upper anvil 5 and the lower anvil 7 of the press to clamp the root of the large flange at the shaft end for pulling out;

[0041] 5. Forge the end shaft. During forging, the operator drives the upper jaw body and the lower jaw body to rotate as a whole, thereby driving the end shaft to rotate, making the forged end shaft more uniform.

[0042] When forging is performed using the forging tool, after the large flange at the shaft end of the forging blank is forged in the die, the upper and lower anvils are used to draw the long shaft body. Compared with the forging method in the prior art, a large number of gasket sets are saved, and there is no need to make a special rotating platform with holes, which reduces the labor intensity of workers, reduces production costs, improves production efficiency, and thus improves economic benefits.

[0043] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A forging method using a large-diameter-ratio end shaft with a large flange die forging tool, characterized in that: The large-diameter-ratio end-shaft large-flange die forging tooling comprises an upper jaw body (1) and a lower jaw body (2) symmetrically mounted on an operating machine, the upper jaw body (1) being provided with a mounting hole (11) whose axis is parallel to the end shaft, the front and rear sides of the upper jaw body being provided with pin holes (14) extending relatively and perpendicular to the mounting hole, a support platform (12) extending outward from the side of the jaw body being provided below the pin hole, the top surface of the support platform (12) being provided with a downwardly concave arc; an arm (3) is passed through the mounting hole (11), the arm (3) comprising an arm rod (31) extending into the mounting hole and a clamping block (32) fixed to one end of the arm rod, the clamping block (32) being provided with a clamping arc facing the large flange (6) at the end of the shaft and matching the outer diameter of the large flange at the end of the shaft; During installation, use the pin shaft passing through the pin hole to connect the upper jaw body to the execution part of the manipulator, and clamp the arc on the support table on the corresponding installation shaft of the manipulator to prevent the upper jaw body from rotating around the pin shaft; The top surface of the upper jaw body is provided with a limit platform (13) extending upwards, and the limit platform is provided to limit excessive outward movement of the upper jaw body; The arm (31) and the clamping block (32) are an integral part, the arm is a round rod, and the projection of the top of the clamping arc along the axial direction of the arm is located within the cross section of the arm; The forging method comprises the following steps: 1) Put the roughened and stretched blank into the die, forge the large flange at the end of the shaft, and then demold it; 2) Install the upper jaw body and the lower jaw body on the manipulator, and then insert the arm rods of the two arms into the mounting holes of the upper jaw body and the lower jaw body respectively, and make the two clamping arcs face each other; 3) The operating machine drives the upper jaw body and the lower jaw body to move relative to each other, so that the two clamping arcs clamp the outer cylindrical surface of the large flange at the shaft end; 4) Pull out the long shaft on the anvil; 5) Forge the end shaft. During forging, the operating machine drives the upper jaw body and the lower jaw body to rotate as a whole, thereby driving the end shaft to rotate.

2. A forging method using a large-diameter-ratio end shaft and large-flange die forging tooling according to claim 1, characterized in that: The mounting hole (11) penetrates the upper jaw body along the axial direction.

3. A forging method using a large-diameter-ratio end shaft and large-flange die forging tooling according to claim 1, characterized in that: The width of the clamping block along the length direction of the arm is 1 to 2 times the thickness of the large flange at the shaft end.

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