A method for manufacturing a double-edged rotary drum cutter shaft

Abstract

This invention relates to the field of flying shear equipment, specifically a manufacturing method for a double-edged rotary drum cutter shaft. The method includes: optimizing the heat treatment allowance diagram of the cutter shaft; rough grooving the shear blade mounting surface, without opening the two ends of the groove; heat treating the workpiece shaft according to the optimized heat treatment allowance diagram to ensure the allowance meets the set requirements; configuring a counterweight: machining a counterweight according to the outer dimensions of the groove on the shear blade mounting surface, and placing the counterweight in the rotating body to restore the outer contour and center of gravity of the rotating body; and using an angle plate for auxiliary positioning: setting an angle plate on the transmission side, and using a dial indicator to calibrate the auxiliary reference hole axis of the angle plate to be parallel to the machine tool shaft. This invention solves the technical problems of the surface hardness of the double-edged rotary drum cutter shaft after machining not meeting design requirements, the impact of unbalanced inertial forces on machining accuracy during turning, and the difficulty in controlling the parallelism and compound angle errors of the shear blade mounting surface and locking cylinder.

Description

Technical Field

[0001] This invention relates to the field of flying shear equipment, specifically a method for manufacturing a double-bladed rotary drum cutter shaft. Background Technology

[0002] The "double-bladed rotary drum cutter shaft" is a crucial component of rotary drum flying shear equipment, used for cutting the head, tail, and segments of steel plates in continuous rolling mill production lines. It is made of 42CrMo forgings, weighs between 20 and 50 tons, and the workpiece's overall length varies from 5 to 9 meters, with a diameter exceeding φ1030mm. (See attached image.) Figure 1 Delivery drawing for a precision-machined double-edged rotary drum cutter shaft. The part has high precision and a complex structure, presenting numerous manufacturing challenges. Existing technology is as follows:

[0003] The manufacturing process of a "double-edged rotary drum cutter shaft" mainly includes steps such as "forging - rough turning - quenching and tempering - semi-finish turning - semi-finish milling - finish turning - finish milling". It uses free forging to form the blank, which can only produce simple shaft types. Current technology, during the quenching and tempering process, produces shaft types with a remaining allowance on the outer diameter (see...). Figure 2 (Existing technology quenching and tempering allowance diagram). Although this process method provides good workpiece rigidity and reduces heat treatment deformation during heat treatment, it has the following problems:

[0004] 1. After quenching and tempering heat treatment, the workpiece needs to be machined to remove a large amount of material to obtain the complex shape of the double shear blade mounting surface ⑤ and the locking cylinder hole ③. The maximum material removal is about 180mm or more (see...). Figure 2 After removing the excess material, the hardness of the working surface and the hardness of the outer circle surface differ significantly. After tempering using existing technology and subsequent removal of the excess material, the overall mechanical properties of the shear blade mounting surface and the locking cylinder mounting surface cannot meet the design requirements. The hardness at this location differs from that at the maximum point on the shaft diameter by more than 100 HB. Furthermore, the overall rigidity of the workpiece is poor, and the deflection during the turning process is too large, reducing the turning accuracy of the outer circle of the shaft diameter and failing to meet the design accuracy requirements.

[0005] 2. After heat treatment, the large cutting volume machining generates machining stress on the workpiece. In order to ensure the final finished dimensions, subsequent dimensional stabilization treatment is required, which increases manufacturing costs and manufacturing cycle.

[0006] II. See also Figure 1 Delivery drawing of the precision-machined double-edged drum cutter shaft. The design precision requirements for the double-edged drum cutter shaft are very high. Due to the removal of a large allowance on the shear blade mounting surface, the following problems exist:

[0007] 1. The center of gravity of the rotating component of the "double-edged rotary drum cutter shaft" does not coincide with the axis of rotation during turning. During turning, a balance block is required to reduce vibration caused by centrifugal force and wear on the machine tool spindle bearings. Existing technology uses a balance block on the machine tool faceplate to eliminate the impact of imbalance on turning accuracy. However, the imbalance generated after machining the shear blade mounting surface ⑤ area is significant. Each shear blade requires a counterweight of over 1060 kg after grooving to meet the balance requirements. The faceplate counterweight method is difficult to meet the requirements for large tonnage counterweights. This method can only reduce centrifugal force during turning, but cannot completely eliminate the impact of imbalance. A new counterweight method needs to break through existing technology to make the workpiece's center of gravity coincide with the axis of rotation of the lathe spindle, reduce the impact of unbalanced inertial forces during turning, and ensure machining accuracy. Optimizing the counterweight method is the technical problem that this invention aims to solve.

[0008] 3. The shear blade mounting surface ⑤ and the locking cylinder hole ③ have parallelism and composite angle requirements. They are machined using a boring machine. According to the existing technology, the machined surface correction method is used for secondary clamping. Due to machine tool system errors and clamping errors, it is difficult to guarantee the parallelism and angle tolerance between the two shear blades. It is necessary to design special tooling to eliminate the comprehensive error of secondary clamping.

[0009] Therefore, the technical problems to be solved by this invention include: 1. Exploring a reasonable heat treatment and tempering method to solve the technical problems of surface hardness not meeting design requirements and uneven hardness after machining of the "double-edged rotary drum cutter shaft", and ensuring the stability of the product's internal quality; 2. Solving the problem of unbalanced inertial force affecting machining accuracy during the turning of the "double-edged rotary drum cutter shaft"; 3. Solving the problem of difficulty in controlling the parallelism and compound angle error of the shear blade mounting surface ⑤ and locking cylinder hole ③ of the "double-edged rotary drum cutter shaft". Summary of the Invention

[0010] To address existing technical challenges such as the surface hardness of the double-edged rotary drum cutter shaft failing to meet design requirements after machining, the impact of unbalanced inertial forces on machining accuracy during turning, and the difficulty in controlling the parallelism and compound angle errors of the shear blade mounting surface and locking cylinder, the main process methods adopted in this invention are as follows:

[0011] A method for manufacturing a double-edged rotary drum cutter shaft includes: optimizing the heat treatment allowance diagram; configuring a counterweight; and using an angle plate for auxiliary positioning.

[0012] Furthermore, optimize the heat treatment allowance diagram of the cutter shaft: rough groove the mounting surface of the shear blade, without opening the two ends of the groove; heat treat the workpiece shaft according to the optimized heat treatment allowance diagram so that the allowance meets the set requirements.

[0013] Furthermore, configure the counterweight: process the counterweight according to the outer dimensions of the shear blade mounting surface groove, and place the counterweight in the rotating body to restore the outer contour and center of gravity of the rotating body;

[0014] Furthermore, angle plate auxiliary positioning: An angle plate is set on the transmission side, and the auxiliary reference hole axis of the angle plate is aligned with the workpiece axis by a dial indicator.

[0015] Furthermore, the maximum allowance for the cutter shaft during heat treatment is less than 40mm. (See [reference needed]). Figure 3 The maximum allowable length is 36mm.

[0016] Furthermore, before quenching and tempering, it also includes rough turning of the outer diameter of each section of the tool shaft; after quenching and tempering, it also includes semi-finish turning of the outer diameter of each section of the tool shaft and semi-finish milling of the tool groove.

[0017] Furthermore, before counterweighting, the shear blade mounting surface, locking cylinder hole, and locking cylinder mounting bolt hole are pre-roughly machined; counterweight blocks are machined according to the weight of the workpiece's double shear blade mounting surface after removing the excess and the groove's outer dimensions; counterweight blocks are then placed on the double shear blade mounting surface by connecting the bolts.

[0018] Further, steel plates are cut and several sets of bolt holes are drilled; round steel bars are welded onto the steel plates in a 9*220 size layout, consistent with the size of the locking cylinder holes on the workpiece.

[0019] Furthermore, the auxiliary reference hole includes 4-φ100H6.

[0020] Furthermore, the outer circle of the angle plate is corrected by using a dial indicator to ensure that the coaxiality error between it and the outer circle of the workpiece bearing stop is within a certain range, and the orientation of the auxiliary reference hole axis is consistent with the orientation of the workpiece's cutting groove; the angle plate is then assembled with the workpiece using bolts and pins.

[0021] Furthermore, after aligning the auxiliary reference hole axis of the angle plate with the machine tool spindle through the wire guide, the shear blade mounting surface, locking cylinder hole, and locking cylinder hole mounting bolt hole are precision machined.

[0022] Furthermore, the lifted workpiece is rotated 90°, and after the axis of the other auxiliary reference hole of the angle plate is aligned with the machine tool spindle by using a dial indicator, the shear blade mounting surface, locking cylinder hole, and locking cylinder hole mounting bolt hole on the other side are precision machined.

[0023] Furthermore, the outer circle of the angle plate is φ1000H6, including 4-φ100H6 auxiliary reference holes, 6-φ40 through holes, and 2-φ30H7 pin holes.

[0024] The present invention has the following beneficial effects:

[0025] I. See also Figure 3The new tempering allowance diagram optimizes the tempering allowance diagram by performing rough machining of the double-edged groove before tempering, thereby improving the overall mechanical properties of the workpiece surface and ensuring that the surface hardness of each area of ​​the workpiece meets the design requirements. The technical effects are as follows: 1. The workpiece shear blade mounting surface ⑤ achieves good overall mechanical properties after tempering. After the part undergoes semi-finishing and finishing processes to remove the allowance, a hardened layer with high hardness can still be retained on the surface. This solves the technical problems of low and uneven hardness after grooving the workpiece shear blade mounting surface ⑤ in the original technology. The new technology ensures that the hardness of each working surface after finishing meets the design requirements of HB200-240. 2. The groove ends are not open, which can enhance the rigidity of the workpiece and reduce the deformation of the part during the tempering process.

[0026] II. See Figure 1 The finishing delivery drawing shows that the counterweight scheme of this invention uses the counterweight block to restore the outer contour and center of gravity of the rotating body, which completely solves the influence of unbalanced inertial force in turning. When turning is performed using this method, the radial runout of the transmission end ⑥ and the operating side ⑦ relative to the bearing stop ① (reference A) and the bearing stop ② (reference B) can be controlled within 0.02mm / AB, which meets the design accuracy requirements.

[0027] III. See also Figure 7 and 8 This invention, using an angle plate as an auxiliary correction datum, solves the problem of ensuring parallelism and compound angle errors during secondary clamping of the shear blade mounting surface in boring machine machining. The angle plate is assembled with the workpiece using bolts and pins. During subsequent secondary clamping, the workpiece's clamping position can be adjusted by adjusting the auxiliary support. After correcting the auxiliary datum hole of the angle plate with a dial indicator, the workpiece is clamped and the double shear blade mounting surface and hole system are boring, thus resolving errors caused by secondary clamping during workpiece machining. This method can control the parallelism of the shear blade mounting surface within 0.1 / AB mm and the compound angle error within 0.05°, meeting design accuracy requirements. Attached Figure Description

[0028] Figure 1 This is a delivery drawing of the precision-machined double-edged rotary drum cutter shaft in this invention;

[0029] Figure 2 This is a heat treatment margin diagram in the existing technology;

[0030] Figure 3 This is the conditioning margin diagram in this invention;

[0031] Figure 4 This is a schematic diagram of the pre-processing plan for the shear blade mounting surface before counterweight in this invention;

[0032] Figure 5 This is a schematic diagram of the counterweight manufacturing process in this invention;

[0033] Figure 6 This is a schematic diagram of the counterweight assembly in this invention;

[0034] Figure 7 This is a schematic diagram of the angle plate design in this invention;

[0035] Figure 8 This is a schematic diagram of the angle plate assembly in this invention.

[0036] The numbers in the diagram are as follows: 1. Bearing stop 1; 2. Bearing stop 2; 3. Locking cylinder hole; 4. Locking cylinder mounting bolt hole; 5. Shear blade mounting surface; 6. Transmission side; 7. Operating side;

[0037] 9. Round steel; 10. Steel plate; 11. Counterweight bolt hole; 12. Handling bolt; 13. Counterweight. Detailed Implementation

[0038] Please see Figure 3 The new tempering allowance diagram, through the optimization of the tempering allowance diagram process measures, improves the comprehensive mechanical properties of the workpiece surface, so that the working surface hardness of each area of ​​the workpiece meets the design requirements.

[0039] The purpose of quenching and tempering is to give the workpiece good comprehensive mechanical properties. A key factor affecting the quality of quenching and tempering is the hardenability of the steel. While 42CrMo is a quenched and tempered steel with relatively high hardenability, its critical diameter is 42–85 mm when water-quenched at 20℃ and 30–60 mm when oil-quenched. Based on these figures, under ideal heat treatment conditions, the allowance on one side of the workpiece should not exceed the steel's critical hardenability value of 85 mm / 2. Otherwise, after heat treatment and subsequent allowance removal, the final finished surface will lack a hardened layer, failing to meet design requirements.

[0040] Before tempering, the mounting surface of the double shear blades is rough-grooved, with approximately 60mm of allowance left at both ends of the groove. This enhances the workpiece's rigidity and reduces deformation during tempering. The maximum allowance for the workpiece during tempering is less than 40mm (36mm in this invention). This ensures that even after semi-finishing and finishing processes to remove the allowance, a hardened layer with high hardness can still be retained on the surface.

[0041] The new technology optimizes the tempering allowance diagram and performs roughing machining on the double-edged groove before heat treatment, solving the technical problems of low and uneven hardness of the workpiece shear blade mounting surface ⑤ after grooving in the original technology. This allows the shear blade mounting surface ⑤ and the locking cylinder mounting surface ③ of the "double-edged rotary drum cutter shaft" to obtain good comprehensive mechanical properties after tempering, and the surface of each workpiece meets the hardness requirement of HB200~240 after finishing.

[0042] Please see Figure 4-6The schematic diagram of the counterweight shows that the technology of this invention uses the counterweight to restore the outer contour and center of gravity of the rotating body, thus solving the problem of unbalanced inertial forces during turning. Applying this method to turning operations, the radial runout of the transmission end ⑥ and the operating side ⑦ relative to bearing stop ① (reference A) and bearing stop ② (reference B) can be controlled within 0.02mm / AB, meeting the design accuracy requirements.

[0043] The specific method is as follows: 1) See Figure 4 A schematic diagram of the pre-machining plan for the shear blade mounting surface before counterweighting; the double shear blade mounting surface ⑤, locking cylinder hole ③, and locking cylinder mounting bolt hole ④ of the workpiece are pre-roughly machined; 2) See Figure 5 A schematic diagram of the counterweight manufacturing process is provided. The counterweight is machined according to the weight of the workpiece after removing the excess material from the double shear blade mounting surface ⑤ and the outer dimensions of the groove; 3) See [reference needed] Figure 6 Schematic diagram of counterweight assembly, showing the counterweight mounted on the double shear blade mounting surface ⑤. Use the bolt The counterweight is assembled with the workpiece as a whole. The counterweight restores the shape and center of gravity of the rotating body, thus solving the problem of unbalanced inertial forces during turning.

[0044] Please see Figure 5 The manufacturing diagram shows: 1. Steel plate ⑩ is processed and cut according to the shape shown in the diagram, and bolt holes for the counterweight are drilled. A total of 4*9 sets are used to ensure the outer dimensions of steel plate ⑩ and the bolt holes of the counterweight. 1. The hole spacing is consistent with the workpiece; 2. The round steel ⑨ is welded to the steel plate ⑩ in a 9*220 size layout, which is consistent with the size of the locking cylinder hole on the workpiece.

[0045] See Figure 1 The delivery drawing shows the precision machining of the double-bladed rotary drum cutter shaft. Based on the design requirements of the parallelism and compound angle of the double shear blade mounting surface and the locking cylinder, and combined with the machine tool machining principle, an "angle plate" is designed and manufactured. The "angle plate" is used to correct the compound angle and centerline position of the shear blade mounting surface and the locking cylinder, thus solving the error caused by secondary clamping during the workpiece machining process.

[0046] In this solution, the double shear blades of the "double-edged rotary drum cutter shaft" are machined using a boring machine. Due to the limited machining range of the boring machine, it is necessary to first machine one shear blade mounting surface and the locking cylinder hole system of the "double-edged rotary drum cutter shaft". Then, the workpiece is lifted, rotated 90°, and corrected and clamped before boring the other shear blade mounting surface and the locking cylinder hole system. The workpiece needs to be clamped twice to complete the machining of the double shear blades.

[0047] In existing technology, after the workpiece is hoisted and clamped twice, the shear blade mounting surface is corrected according to the already machined shear blade mounting surface before another shear blade is machined. This method ignores the errors of the clamping and positioning elements, as well as the off-center load of the machine tool table or the clearance of the guide rails, resulting in the accuracy of the shear blade mounting surface and the locking cylinder hole system machined in the two stations not meeting the design requirements.

[0048] For workpieces with limited machining range requiring secondary clamping and high precision requirements between two workstations, an auxiliary reference is needed as a subsequent correction reference to ensure the consistency of the reference in the workpiece during the preceding and following machining processes.

[0049] Please see Figure 7 The schematic diagram of the angle plate design shows that the "angle plate" serves as an auxiliary correction reference in this invention. The relationship between the two shear blade mounting surfaces and the locking cylinder hole system of the double-edged rotary drum cutter shaft is transferred to two sets of φ100 holes on the angle plate. Subsequent machining of the double shear blades is performed using these two sets of φ100 holes for correction. The specific implementation method is as follows: The "angle plate" is assembled to the workpiece shaft end via bolt connections and pin positioning. During subsequent secondary clamping and machining, the workpiece's clamping position can be adjusted by adjusting the auxiliary support. The axis of the φ100 auxiliary reference hole on the angle plate is aligned parallel to the machine tool spindle using a dial indicator. After ensuring that both clamping states are consistent with the axis orientation of the angle plate holes, the workpiece is clamped, and the shear blade mounting surface and locking cylinder hole system of the workpiece are boring.

[0050] The technology of this invention only requires correction using the two sets of φ100H6 holes on the angle plate during the secondary clamping process, so that the secondary clamping position of the workpiece is based on the angle plate. This eliminates the influence of machine tool error and fixture error on machining accuracy. This method only requires ensuring that the manufacturing accuracy of the angle plate meets the requirements. The method is simple and easy to operate, and can meet the processing needs of small batches and large batches. It has high processing efficiency, low requirements for machine tool accuracy, and easy-to-guarantee machining accuracy.

[0051] Angle plate design schematic diagram, requirements are as follows: 1. The outer circle of the angle plate, φ1000h6, serves as the reference for alignment with the workpiece coaxiality. The outer circle dimension design accuracy is better than grade 6, and the cylindricity is better than 0.01mm; 2. The circumferential radial composite angle hole, 4-φ100 H6, requires a dimensional accuracy better than grade 6. The included angle of the hole axis at 7° and 90° should be consistent with the composite angle of the workpiece shear blade mounting surface, and the angle error should be controlled within 0.02°. 3. See Figure 8 The angle plate assembly diagram shows that the angle plate is connected to the workpiece with bolts. Utilizing the 8-M36 bolt holes on the workpiece shaft end face, corresponding 6-φ40 through holes and 2-φ30H7 pin holes are designed on the thickness plane of the angle plate for engagement with the workpiece shaft end bolts and for positioning with tapered pins. This ensures that no displacement occurs between the angle plate and the workpiece during processing, guaranteeing an accurate and constant positional relationship between them.

[0052] The process steps for making the angle plate are as follows: 1. Select steel plate for cutting and fabrication; 2. Use a high-precision CNC boring and milling machine to process the angle plate according to the design requirements, controlling the accuracy of the outer circle φ1000h6 and the circumferential radial 4-φ100H6 holes; 3. Use a coordinate measuring machine to inspect the accuracy of the angle plate according to the design requirements; 4. On the machine tool, correct the coaxiality error between the outer circle φ1000h6 of the angle plate and the outer circle of the workpiece bearing stop to within 0.01 mm, then make two φ30H7 holes, and install the locating pins after fitting.

[0053] Example

[0054] The double-edged rotary drum cutter shaft is made of 42CrMo forgings. The manufacturing process mainly includes "forging-rough turning-rough milling-quenching and tempering treatment-semi-finish turning-semi-finish milling-finish turning-finish milling" and other processes.

[0055] This invention provides a manufacturing method for a double-edged rotary drum cutter shaft. Through innovative breakthroughs in key technical difficulties, it ensures that the final machining accuracy and comprehensive mechanical properties of the workpiece meet design requirements. The specific implementation method is as follows:

[0056] I. Rough processing before conditioning

[0057] 1. See Figure 3 New tempering allowance diagram, rough machining of the outer diameter of each section;

[0058] 2. See Figure 3 New tempering allowance diagram, rough milling groove.

[0059] II. Conditioning

[0060] According to the heat treatment process specifications, the workpiece is heat-treated in the furnace.

[0061] III. Semi-finishing after tempering

[0062] 1. See Figure 1 The final machining delivery drawing is provided, with a 2-3mm allowance. The outer diameter of each section is semi-finished by precision machining.

[0063] 2. See Figure 1 The final delivery drawing is finished, leaving a 2-3mm allowance, and the double-edged groove is semi-finish milled.

[0064] 3. See also Figure 4 A schematic diagram of the pre-processing plan for the shear blade mounting surface before counterweighting. Leave a 2-3mm allowance according to the delivery drawing, and process the locking cylinder hole ③ and the locking cylinder mounting bolt hole ④.

[0065] IV. Making the Balance Weights

[0066] 1. See Figure 4 A schematic diagram of the pre-processing plan for the shear blade mounting surface before counterweight; computer modeling and calculation of the weight to be removed from the double shear blade mounting surface and the locking cylinder mounting surface of the workpiece.

[0067] 2. See Figure 5 A schematic diagram of the counterweight construction is provided. The counterweight is constructed based on the weight to be removed from the double-edged groove of the workpiece and the external dimensions of the groove, as shown below:

[0068] 1) Steel plate ⑩ is cut and fabricated according to the shape shown in the figure, and bolt holes for the counterweight are drilled. A total of 4*9 sets are used to ensure the outer dimensions of steel plate ⑩ and the bolt holes of the counterweight. The hole spacing should match the workpiece.

[0069] 2) The round steel bar ⑨ is welded onto the steel plate ⑩ in a 9*220 size layout, which is consistent with the size of the locking cylinder hole on the workpiece.

[0070] 3. See also Figure 6 Assembly diagram of counterweight, using bolts. Connect the two blades together and place a counterweight on the mounting surface ⑤ of the double-bladed shear. The shape and center of gravity of the rotating body are restored by using counterweights to solve the problem of unbalanced inertial forces during turning.

[0071] V. Shaft Diameter Precision Turning

[0072] 1. See Figure 6 A schematic diagram of the counterweight assembly, showing the counterweight positioned at the double slot;

[0073] 2. Correct the workpiece according to the outer diameter of the bearings at both ends, and then precision machine the outer diameter of each section to meet the requirements of the precision machining delivery drawing.

[0074] 3. Remove the workpiece from the machine tool, remove the counterweight, and hoist it to the boring machine to machine the double-edged groove.

[0075] VI. Construction of the Angle Plate

[0076] See Figure 7 Angle plate making diagram for production

[0077] 1. Made from steel plates;

[0078] 2. High-precision CNC boring and milling machines and lathes are used for machining, and the plates are manufactured according to the design requirements, controlling the accuracy of the outer circle φ1000h6 and the circumferential radial holes 4-φ100 H7;

[0079] 3. Use a coordinate measuring machine to inspect the accuracy of the angle plate according to the design requirements;

[0080] VII. Precision boring of double-edged grooves

[0081] 1. The workpiece is hoisted onto the boring machine, placed on the rotary table, and clamped on the V-block. The bearing stops ① and ② at both ends of the workpiece are aligned, with the error within 0.02mm. The pressure plate is then used to firmly press the workpiece.

[0082] 2. Hoisting angle plate, refer to Figure 8 Assemble the angle plate according to the assembly diagram. Use a dial indicator to check that the coaxiality error between the outer circle of the angle plate φ1000h6 and the outer circle of the workpiece bearing is within 0.02 mm. The axis of the 4-φ100H6 hole is aligned with the double-edged groove of the workpiece. Make two φ30H7 holes and install the locating pins after assembly.

[0083] 3. After the axis of the φ100H6 hole on the wire gauge calibration angle plate is parallel to the machine tool spindle, finish machine the blade shear mounting surface ⑤;

[0084] 4. Install the angle milling head, straighten it twice with the angle milling head, make it parallel to the axis of the locking cylinder mounting surface ③ hole to be machined, and finish machine the locking cylinder mounting surface and hole;

[0085] 5. The overhead crane tilts the workpiece 90°.

[0086] 6. After the axis of the φ100H6 hole at another 90° position on the wire gauge calibration angle plate is parallel to the machine tool spindle, finish machine the blade shear mounting surface ⑤;

[0087] 7. Install the angle milling head, straighten it twice with the angle milling head, make it parallel to the axis of hole ③ on the locking cylinder mounting surface to be machined, and finish machine the locking cylinder mounting surface and hole.

Claims

1. A method for manufacturing a double-edged rotary drum cutter shaft, characterized in that, Includes the following steps: (1) Optimize the heat treatment allowance diagram of the cutter shaft: rough groove the mounting surface of the shear blade, and do not open the two ends of the groove; heat treat the workpiece shaft according to the optimized heat treatment allowance diagram so that the allowance meets the set requirements. (2) Configure counterweight: Process counterweight according to the outer dimensions of the shear blade mounting surface groove, and place the configured counterweight in the rotating body to restore the outer contour and center of gravity of the rotating body; (3) Angle plate auxiliary positioning: An angle plate is set on the transmission side, and the axis of the auxiliary reference hole of the angle plate is aligned with the machine tool axis by using a dial indicator; The outer circle of the angle plate is corrected by using a wire gauge to ensure that the coaxiality error between it and the outer circle of the bearing stop of the workpiece is within a certain range, and the orientation of the auxiliary reference hole axis is consistent with the orientation of the cutting groove of the workpiece. The angle plate is assembled with the workpiece using bolts and pins for positioning. After aligning the auxiliary reference hole axis of the angle plate with the machine tool spindle through the wire gauge, precision machine the shear blade mounting surface, locking cylinder hole, and locking cylinder hole mounting bolt hole. After the workpiece is lifted and rotated 90°, and the axis of the other auxiliary reference hole of the angle plate is aligned with the machine tool spindle through the dial indicator, the shear blade mounting surface, locking cylinder hole, and locking cylinder hole mounting bolt hole on the other side are precision machined.

2. The manufacturing method of the double-edged rotary drum cutter shaft according to claim 1, characterized in that, The maximum allowance of the cutter shaft during heat treatment is less than 40mm.

3. The manufacturing method of the double-edged rotary drum cutter shaft according to claim 1, characterized in that, Before quenching and tempering, it also includes rough turning of the outer diameter of each section of the tool shaft; after quenching and tempering, it also includes semi-finish turning of the outer diameter of each section of the tool shaft and semi-finish milling of the tool groove.

4. The manufacturing method of the double-edged rotary drum cutter shaft according to claim 1, characterized in that, Before counterweighting, the shear blade mounting surface, locking cylinder hole, and locking cylinder mounting bolt hole are pre-roughly machined; counterweight blocks are machined according to the weight of the workpiece's double shear blade mounting surface after removing the excess and the groove's outer dimensions; counterweight blocks are then placed on the double shear blade mounting surface by connecting the bolts.

5. The manufacturing method of the double-edged rotary drum cutter shaft according to claim 1, characterized in that, Cut the steel plate and drill several sets of bolt holes; weld the round steel bars to the steel plate in a 9*220 size layout, which is consistent with the size of the locking cylinder hole on the workpiece.

6. The manufacturing method of the double-edged rotary drum cutter shaft according to claim 1, characterized in that, The auxiliary reference holes include 4-φ100H6.

7. The method for manufacturing a double-edged rotary drum cutter shaft according to claim 1, characterized in that, The outer circle of the angle plate is φ1000 H6, including 4-φ100H6 auxiliary reference holes, 6-φ40 through holes, and 2-φ30H7 pin holes.

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