Processing technology and tooling for extra-large spherical rollers with central through holes

Abstract

The present invention relates to a processing method and tooling for spherical rollers, and specifically to a processing technology and tooling for extra-large spherical rollers with a central through hole, including a dynamic centering chuck, including a chassis, a slider, a clamping jaw and a bolt; a plurality of clamping jaws are arranged at equal distances on the chassis, each of the clamping jaws is slidably connected to the chassis via a slider, a slideway is arranged at a position corresponding to the slider on the chassis, and the slider cooperates with the slideway and moves in the slideway; the slider is fixedly connected to the clamping jaw by bolts, and the clamping jaw is a double-step structure; a top device with a stop pad is inserted into the through hole of a workpiece, and the end face of the stop pad is used to press the end face of the workpiece to ensure that the top device can form a clamp and a push with the chuck to avoid failure of the top. The beneficial effect of adopting the above technical solution is to solve the error and under-positioning problems caused by repeated positioning of the workpiece during the processing.

Description

Technical Field

[0001] The invention relates to a processing technology and tooling for an extra-large spherical roller with a central through hole. Background Art

[0002] At present, in the process of machining extra-large spherical rollers with center through holes, repeated positioning of the workpiece causes errors and under-positioning problems. Summary of the invention

[0003] The purpose of the invention is to provide a processing technology and tooling for a super-large spherical roller with a central through hole.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an extra-large spherical roller processing tool with a central through hole, including a power centering chuck with a double-step structure, including a chassis, a slider, a clamping jaw and a bolt; a plurality of clamping jaws are arranged on the chassis at equal distances, each of the clamping jaws is slidably connected to the chassis through a slider, a slideway is arranged at a position corresponding to the slider on the chassis, and the slider cooperates with the slideway and moves in the slideway; the slider is fixedly connected to the clamping jaw by a bolt, and the clamping jaw is a double-step structure;

[0005] The power centering chuck is a three-jaw self-centering chuck;

[0006] The double-step structure is arranged from high to low from the edge of the chassis to the center of the chassis;

[0007] Furthermore, the double-step structure clamping jaws arranged from high to low respectively include a first right-angle step and a second arc step;

[0008] The first right-angle step is used for rounding the first side of the rolling element after rough turning, so that the outer diameter of the workpiece contacts the straight surface of the right-angle step;

[0009] When the second arc step is used to process the chamfer on the other side, the chamfer processed on the first side of the workpiece contacts the arc surface of the arc step;

[0010] Furthermore, the arc surface angle of the second arc step is preset to be the same as the fillet angle of the first side of the workpiece after machining; this can ensure the coaxial clamping of the workpiece and the chuck, and ensure the required accuracy of the machining workpiece;

[0011] Furthermore, in order to solve the problem of insufficient clamping positioning and production efficiency caused by the shortened length of the workpiece clamped by the clamping jaws, the chuck clamps one end of the workpiece through the clamping jaws, and a center device is provided at the other end of the workpiece, and the center device is inserted into the central through hole of the workpiece;

[0012] The top device and the chuck form a one-clamp-one-top mode;

[0013] The centering tip is a standard centering tip with a diameter of 28mm and a maximum hole diameter of Φ28㎜. When the diameter of the center hole of the supported rolling body exceeds Φ28㎜, the centering tip will fail.

[0014] Furthermore, in order to solve the problem of under-positioning in the Z-axis direction due to the failure of the machine tool tailstock center due to the large diameter of the rolling element center drill hole and the large spherical surface with extremely high end face, a threaded buckle is provided on the outer diameter surface of the center, and a stopper is provided on the outer diameter. The distance and position of the stopper are adjusted by the threaded buckle on the outer diameter surface of the center. When the hole diameter is larger than the outer diameter of the center, the end face of the stopper is used to press the end face of the workpiece, thereby expanding the processing range and strengthening the auxiliary support.

[0015] The diameter of the retaining pad is Φ120㎜, and the end face height is 30㎜; Φ8㎜ holes are evenly distributed at three points on the outer diameter of the retaining pad, and the holes are threaded. The mounting screws are used to adjust the end face flatness between the retaining pad and the large spherical roller, and at the same time fix the retaining pad to prevent displacement and rotation.

[0016] The processing technology of the spherical roller with a central through hole using the above tooling structure is as follows:

[0017] (1) Clamp the forging blank on an ordinary power centering chuck with only a right-angle step. The chuck's jaws clamp 1 / 3 of the blank's outer diameter to ensure that the clamp is in the best position required by the lever principle. Process the end face, outer diameter, and drill hole diameter of Φ30㎜ on one side. Due to the limitation of the drilling tool and the convenience of processing, the drilling length is half the length of the workpiece. After completing the above processing, turn the workpiece over and clamp the other side's end face, outer diameter, and drill hole diameter of Φ30㎜ for the second time. At this time, the positioning surface is the precision reference, and the coaxiality of the drill hole meets the process requirements.

[0018] The forging blank has a diameter of Φ151.5 mm and an end face height of 182.3 mm;

[0019] (2) A power centering chuck with a double-step structure is used. After completing the processing of step (1), the workpiece is clamped on the first right-angle step. During installation, the length of the clamped workpiece surface does not exceed the maximum coordinate of the R fillet of the end face of the workpiece. After clamping, the R fillet is processed. After the processing is completed, the workpiece is turned over and loaded into the arc surface of the pre-machined second arc step for clamping. The R fillet processing on the other side is performed, and the entire processing is completed.

[0020] In the above steps (1) and (2), after the clamping jaws have completed clamping the workpiece during each processing, the center device is inserted into the through hole of the workpiece at the processing end to form a one-clamp-one-top mode with the chuck, thereby ensuring that the workpiece is positioned more stably during the processing;

[0021] The length of the clamped workpiece surface is 2 to 5 mm, which is convenient for the cutting tool to complete the shaping. The remaining part is removed when processing the R fillet on the other side, so that a complete outer spherical surface can be obtained.

[0022] Since the workpiece diameter is Φ30㎜, after the clamping jaws complete the clamping of the workpiece, the center device with a stop pad will be inserted into the through hole of the workpiece, and the end face of the stop pad will be used to press the end face of the workpiece to ensure that the center device can form a clamping and pushing form with the chuck to avoid failure of the center.

[0023] The beneficial effect of adopting the above technical solution is to solve the error and under-positioning problems caused by repeated positioning of the workpiece during the processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the double-step structure power centering chuck of the present invention.

[0025] Figure 2 This is the structural diagram of a common power centering chuck.

[0026] Figure 3 This is a diagram of the top device structure.

[0027] Figure 4 This is the structural diagram of the top device baffle.

[0028] Figure 5 This is the finished structure diagram of the rolling element with a center through hole.

[0029] In the figure, 1, chassis, 2, slider, 3, clamping jaw, 4, first right-angle step, 5, second arc step, 6, top device, 7, stopper, 8, hole. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the accompanying drawings and embodiments. Example

[0031] An extra-large spherical roller processing tool with a central through hole comprises a power centering chuck, a chassis, a slider, a clamping jaw and a bolt; a plurality of clamping jaws are arranged at equal distances on the chassis, each of the clamping jaws is slidably connected to the chassis via a slider, a slideway is arranged at a position corresponding to the slider on the chassis, the slider cooperates with the slideway and moves in the slideway; the slider is fixedly connected to the clamping jaw via a bolt, and the clamping jaw is a double-step structure;

[0032] The power centering chuck is a three-jaw self-centering chuck;

[0033] The double-step structure is arranged from high to low from the edge of the chassis to the center of the chassis;

[0034] Furthermore, the double-step structure clamping jaws arranged from high to low respectively include a first right-angle step and a second arc step;

[0035] The first right-angle step is used for rounding the first side of the rolling element after rough turning, so that the outer diameter of the workpiece contacts the straight surface of the right-angle step;

[0036] When the second arc step is used to process the chamfer on the other side, the chamfer processed on the first side of the workpiece contacts the arc surface of the arc step;

[0037] In order to solve the problem of insufficient clamping positioning and production efficiency caused by the shortened length of the workpiece clamped by the clamping jaws, the chuck clamps one end of the workpiece through the clamping jaws, and a center device is provided at the other end of the workpiece, and the center device is inserted into the central through hole of the workpiece;

[0038] The top device and the chuck form a one-clamp-one-top mode;

[0039] The top is a standard top with a diameter of 28mm and a maximum hole diameter of Φ28㎜.

[0040] The processing technology of the spherical roller with a central through hole using the above tooling structure is as follows:

[0041] (1) Clamp the forging blank on an ordinary power centering chuck with only a right-angle step. The chuck's jaws clamp 1 / 3 of the blank's outer diameter to ensure that the clamp is in the best position required by the lever principle. Process the end face, outer diameter, and drill hole diameter of Φ30㎜ on one side. Due to the limitation of the drilling tool and the convenience of processing, the drilling length is half the length of the workpiece. After completing the above processing, turn the workpiece over and clamp the other side's end face, outer diameter, and drill hole diameter of Φ30㎜ for the second time. At this time, the positioning surface is the precision reference, and the coaxiality of the drill hole meets the process requirements.

[0042] The forging blank has a diameter of Φ151.5 mm and an end face height of 182.3 mm;

[0043] (2) A power centering chuck with a double-step structure is used. After completing the processing of step (1), the workpiece is clamped on the first right-angle step. During installation, the length of the clamped workpiece surface does not exceed the maximum coordinate of the R fillet of the end face of the workpiece. After clamping, the R fillet is processed. After the processing is completed, the workpiece is turned over and loaded into the arc surface of the pre-machined second arc step for clamping. The R fillet processing on the other side is performed, and the entire processing is completed.

[0044] In the above steps (1) and (2), after the clamping jaws have completed clamping the workpiece during each processing, the center device is inserted into the through hole of the workpiece at the processing end to form a one-clamp-one-top mode with the chuck, thereby ensuring that the workpiece is positioned more stably during the processing;

[0045] The length of the clamped workpiece surface is 2 to 5 mm, which is convenient for the cutting tool to complete the shaping. The remaining part is removed when processing the R fillet on the other side, so that a complete outer spherical surface can be obtained. Example

[0046] An extra-large spherical roller processing tool with a central through hole comprises a power centering chuck, a chassis, a slider, a clamping jaw and a bolt; a plurality of clamping jaws are arranged at equal distances on the chassis, each of the clamping jaws is slidably connected to the chassis via a slider, a slideway is arranged at a position corresponding to the slider on the chassis, the slider cooperates with the slideway and moves in the slideway; the slider is fixedly connected to the clamping jaw via a bolt, and the clamping jaw is a double-step structure;

[0047] The power centering chuck is a three-jaw self-centering chuck;

[0048] The double-step structure is arranged from high to low from the edge of the chassis to the center of the chassis;

[0049] Furthermore, the double-step structure clamping jaws arranged from high to low respectively include a first right-angle step and a second arc step;

[0050] The first right-angle step is used for rounding the first side of the rolling element after rough turning, so that the outer diameter of the workpiece contacts the straight surface of the right-angle step;

[0051] When the second arc step is used to process the chamfer on the other side, the chamfer processed on the first side of the workpiece contacts the arc surface of the arc step;

[0052] In order to solve the problem of under-positioning in the Z-axis direction caused by the failure of the tailstock center of the machine tool due to the large diameter of the rolling body center drill hole and the large spherical surface with super high end face, the workpiece diameter is Φ30㎜, the chuck clamps one end of the workpiece through the clamping claws, and a center device is provided at the other end of the workpiece. The center device with a stop pad is inserted into the through hole of the workpiece, and the end face of the stop pad is used to press the end face of the workpiece to ensure that the center device can form a clamp and a push with the chuck; the diameter of the stop pad is Φ120㎜, and the end face height is 30㎜;

[0053] The outer diameter of the retaining pad is evenly distributed with Φ8mm holes at three points, the holes are threaded, and the mounting screws are used to adjust the end surface flatness between the retaining pad and the large spherical roller, and at the same time fix the retaining pad to prevent displacement and rotation.

[0054] The processing technology of the spherical roller with a central through hole using the above tooling structure is as follows:

[0055] (1) Clamp the forging blank on an ordinary power centering chuck with only a right-angle step. The chuck's jaws clamp 1 / 3 of the blank's outer diameter to ensure that the clamp is in the best position required by the lever principle. Process the end face, outer diameter, and drill hole diameter of Φ30㎜ on one side. Due to the limitation of the drilling tool and the convenience of processing, the drilling length is half the length of the workpiece. After completing the above processing, turn the workpiece over and clamp the other side's end face, outer diameter, and drill hole diameter of Φ30㎜ for the second time. At this time, the positioning surface is the precision reference, and the coaxiality of the drill hole meets the process requirements.

[0056] The forging blank has a diameter of Φ151.5 mm and an end face height of 182.3 mm;

[0057] (2) A power centering chuck with a double-step structure is used. After completing the processing of step (1), the workpiece is clamped on the first right-angle step. During installation, the length of the clamped workpiece surface does not exceed the maximum coordinate of the R fillet of the end face of the workpiece. After clamping, the R fillet is processed. After the processing is completed, the workpiece is turned over and loaded into the arc surface of the pre-machined second arc step for clamping. The R fillet processing on the other side is performed, and the entire processing is completed.

Claims

1. The processing technology of extra-large spherical roller with central through hole is characterized by: The method comprises the following steps: (1) clamping the forged blank on an ordinary power centering chuck with only a right-angle step, wherein the jaws of the chuck clamp the outer diameter of the blank and the clamping length is 1 / 3 of the length of the workpiece, and processing the end face, outer diameter, and drilling diameter of Φ30㎜ on one side, wherein the drilling length is half of the length of the workpiece; after completing the above processing, turning the workpiece over, and clamping the end face, outer diameter, and drilling diameter of Φ30㎜ on the other side for a second time; (2) using a power centering chuck with a double-step structure, after completing the processing of step (1), clamp the workpiece on the first right-angle step again, and during installation, clamp the workpiece surface for a length of 2 to 5㎜, and after clamping, process the R fillet; after processing, turn the workpiece over, load the workpiece into the arc surface of the pre-machined second arc step for clamping, and process the R fillet on the other side, and the entire processing is completed; Among them, the clamping tooling of the processing technology includes a power centering chuck with a double-step structure, including a chassis, a slider, a clamping jaw and a bolt; a plurality of clamping jaws are arranged on the chassis at equal distances, each of the clamping jaws is slidably connected to the chassis through a slider, a slideway is arranged at a position corresponding to the slider on the chassis, and the slider cooperates with the slideway and moves in the slideway; the slider is fixedly connected to the clamping jaw by a bolt, and the clamping jaw is a double-step structure; The double-step structure is arranged from high to low from the edge of the chassis to the center of the chassis; the double-step structure jaws arranged from high to low respectively include a first right-angle step and a second arc step; the power centering chuck of the double-step structure clamps one end of the workpiece through the jaws, and a center device is provided at the other end of the workpiece, and the center device is inserted into the central through hole of the workpiece; The first right-angle step is used for rounding the first side of the rolling body after rough turning, and the outer diameter of the workpiece contacts the straight surface of the first right-angle step; the second arc step is used for rounding the other side, and the rounded corner on the first side of the workpiece contacts the arc surface of the second arc step; the arc surface angle of the second arc step is preset and is the same as the rounded corner angle of the first side of the workpiece after processing.

2. The process for processing an extra-large spherical roller with a central through hole according to claim 1 is characterized in that: The dynamic centering chuck with a double-step structure is a three-jaw self-centering chuck.

3. The process for processing an extra-large spherical roller with a central through hole according to claim 1 is characterized in that: The centering device and the power centering chuck with a double-step structure form a one-clamping and one-pushing mode.

4. The process for processing an extra-large spherical roller with a central through hole according to claim 3 is characterized in that: A threaded buckle is provided on the outer diameter surface of the top, and a stopper is provided on the outer diameter. The distance position of the stopper is adjusted by the threaded buckle on the outer diameter surface of the top. When the hole diameter is larger than the outer diameter of the top, the end face of the stopper is used to press the end face of the workpiece.

5. The process for processing an extra-large spherical roller with a central through hole according to claim 4 is characterized in that: The diameter of the retaining pad is Φ120mm, and the end surface height is 30mm; and Φ8mm holes are evenly distributed at three points on the outer diameter of the retaining pad.

Images