Machining method for improving chamfer circle run-out precision of hard turning roller and spring pressing rod used for achieving method

Abstract

The invention discloses a machining method for improving the chamfer circle run-out precision of a hard turning roller and a spring pressing rod used for achieving the method, and belongs to the field of roller chamfer machining. The method solves the technical problems that in the existing roller machining process, mechanical arm positioning belongs to rigid connection, and positioning errors existing in the clamping process cannot be corrected, and comprises the following steps that S1, a roller is conveyed to the center of a chuck connected with a machine tool spindle, and the chuck clamps the roller in the radial direction; s2, the roller is jacked tightly in the axial direction through a spring pressing rod; s3, loosening the chuck; s4, the chuck corrects the radial offset of the roller and clamps the roller in the radial direction; s5, the spring pressing rod returns to the mechanical zero point; and S6, the machine tool spindle rotates, and roller chamfering machining is completed. The auxiliary feeder of the spring pressing rod is a hollow cylinder, the ram is flexibly connected with the auxiliary feeder, threads are arranged on the outer side face of the auxiliary feeder, and the nut is arranged on the outer side of the auxiliary feeder in a sleeving mode through the threads. The roller machining method is used for roller machining.

Description

Technical Field

[0001] The invention relates to a processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller and a spring pressure rod for realizing the method, and belongs to the field of roller chamfering processing. Background Art

[0002] As the requirements of equipment for bearing performance indicators become higher and higher, the accuracy level of bearing components such as rings and rolling elements is also increasing. The "hard turning chamfering" process of rollers has undergone major precision adjustments. The existing lathes and tooling can no longer meet the requirements of chamfering circle runout within 0.8%, and the stability of processing quality cannot be maintained during automated continuous processing, which has brought certain difficulties to the production and manufacturing of high-precision bearings.

[0003] The three-jaw pneumatic chuck that comes with the machine tool has too much clearance and its rigidity does not meet the requirements, resulting in an inward or downward pulling force when clamping the workpiece. This clamping method seriously affects the processing accuracy. If the product deviates when the robot is loading, the chuck clamping cannot correct the product deflection, and the processed product will cause the chamfer runout to exceed the tolerance.

[0004] In summary, the positioning of the robot in the existing roller processing process is a rigid connection, and there is a technical problem that the positioning error existing in the clamping process cannot be corrected. Summary of the invention

[0005] The present invention aims to solve the technical problem that in the existing roller processing process, the positioning of the manipulator is a rigid connection and the positioning error existing in the clamping process cannot be corrected, and further provides a processing method for improving the chamfer circle runout accuracy of hard-turned rollers and a spring pressure rod for implementing the method.

[0006] The technical solution of the present invention is a processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller, which comprises the following steps:

[0007] S1. Send the roller to the chuck connected to the machine tool spindle, and the chuck clamps the roller in the radial direction;

[0008] S2, tighten the roller axially through the spring pressure rod;

[0009] S3, the chuck is loose;

[0010] S4, the chuck corrects the radial offset of the roller and clamps the roller in the radial direction;

[0011] S5, the spring pressure rod returns to the mechanical zero point;

[0012] S6. The machine tool spindle rotates to complete the roller chamfering process.

[0013] As another improvement of the present invention, step S1 includes the following sub-steps:

[0014] S1-1, the manipulator sends the roller to the chuck connected to the machine tool spindle;

[0015] S1-2, the hydraulic ejector rod installed on the manipulator presses the roller axially;

[0016] S1-3, the chuck clamps the roller in radial direction;

[0017] S1-4, hydraulic ejector rod is retracted;

[0018] S1-5. The robot returns to the mechanical origin.

[0019] As another improvement of the present invention, the roller chamfering process in step S6 is performed by turning.

[0020] As another improvement of the present invention, the chuck connected to the machine tool spindle adopts a six-jaw pneumatic chuck.

[0021] The present invention also provides a spring pressure rod, which includes a striker, an auxiliary loader and a nut. The auxiliary loader is a hollow cylinder. The striker is flexibly connected to the auxiliary loader. The outer side of the auxiliary loader is provided with a thread. The nut is threadedly mounted on the outer side of the auxiliary loader.

[0022] As another improvement of the present invention, an oil pressure damper is radially installed inside the auxiliary loader, and the impact head is installed on the head of the auxiliary loader through the oil pressure damper.

[0023] As another improvement of the present invention, the impact head is made of rubber.

[0024] Beneficial effects of the present invention:

[0025] 1. The present invention improves the processing method to ensure that the precision of the radial runout of the processed product is within 0.008mm. In order to ensure that the clamping force generated by the chuck is consistent during the clamping process, a six-jaw pneumatic chuck is customized and a six-jaw clamping method is adopted. In this way, no pulling force in other directions is generated during the clamping process, ensuring the precision of the circular runout of the clamping positioning.

[0026] 2. The impact head is flexibly connected to the auxiliary loader, and a spring oil pressure damper connection is used to ensure flexible connection. The manual loading environment is simulated to ensure that there is enough space to correct the product when the chuck is clamped, so that the product offset can be corrected when the chuck is clamped.

[0027] 3. After the product is processed by the processing method of the present invention for improving the chamfer circle runout accuracy of hard-turned rollers, it is tested that the chamfer circle runout of the hard-turned rollers is improved from 0.02mm to 0.005mm, and the chamfer circle runout difference of the same roller is improved from 0.02mm to 0.005mm, which is significantly improved compared with the previous process method. The accuracy fully meets the process requirements, and the quality is stable during the processing, and the processing efficiency and the qualified rate of finished products are also greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a spring pressure rod of the present invention.

[0029] Figure 2 It is a structural diagram of a six-jaw pneumatic chuck. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0031] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described as a processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller, characterized in that it comprises the following steps:

[0032] S1. Send the roller to the center of the chuck connected to the machine tool spindle, and the chuck clamps the roller in the radial direction;

[0033] S2, tighten the roller axially through the spring pressure rod;

[0034] S3, the chuck is loose;

[0035] S4, the chuck corrects the radial offset of the roller and clamps the roller in the radial direction;

[0036] S5, the spring pressure rod returns to the mechanical zero point;

[0037] S6. The machine tool spindle rotates to complete the roller chamfering process.

[0038] A six-jaw pneumatic chuck was customized, and an integrated collet was selected to ensure rigidity. A six-jaw clamping method was adopted, so that no pulling force in other directions would be generated during the clamping process, ensuring the accuracy of the circular runout of clamping and positioning.

[0039] In the existing processing method, the hydraulic ejector is used to feed the product when the robot clamps the product. The pressure is relatively high, there is no room for product correction, and the connection with the chuck is hard and hard. The chuck cannot correct the product deviation like manual feeding, resulting in product deviation.

[0040] This solution simulates the manual loading environment by improving the processing method to ensure that there is enough space to correct the product when the chuck is clamped, so that the product offset can be corrected when the chuck is clamped. Compared with the previous process method, it has been significantly improved, the accuracy fully meets the process requirements, and the quality is stable during the processing, and the processing efficiency and finished product qualification rate are also greatly improved.

[0041] Specific implementation method 2: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that step S1 includes the following sub-steps:

[0042] S1-1, the manipulator sends the roller to the center of the chuck connected to the machine tool spindle;

[0043] S1-2, the hydraulic ejector rod installed on the manipulator presses the roller axially;

[0044] S1-3, the chuck clamps the roller in radial direction;

[0045] S1-4, hydraulic ejector rod is retracted;

[0046] S1-5. The robot returns to the mechanical origin.

[0047] Specific implementation method three: Combination Figure 1 and Figure 2 The present embodiment is described. The present embodiment is different from the first embodiment in that the roller chamfering process in step S6 is performed by turning.

[0048] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that the chuck connected to the machine tool spindle adopts a six-jaw pneumatic chuck. The six-jaw pneumatic chuck is directly connected to the machine tool spindle by screws to form an integrated chuck to ensure rigidity. The six-jaw chuck is used to increase the clamping area, so that no pulling force in other directions is generated during the clamping process, ensuring the accuracy of the circular runout of the clamping positioning.

[0049] Specific implementation method five: Combination Figure 1 and Figure 2This embodiment is described. This embodiment provides a spring pressure rod, which is used in a processing method of a specific embodiment. A spring pressure rod includes a striker 1, an auxiliary feeder 2 and a nut 3. The auxiliary feeder 2 is a hollow cylinder. The striker 1 is flexibly connected to the auxiliary feeder 2. The outer side of the auxiliary feeder 2 is provided with a thread. The nut 3 is sleeved on the outer side of the auxiliary feeder 2 through the thread. The nut is a hexagonal nut. The spring pressure rod is installed and fixed by the nut. The striker 1 is flexibly connected to the auxiliary feeder 2. The roller is axially pressed by the striker of the spring pressure rod; the chuck is loosened; the chuck corrects the radial offset of the roller and clamps the roller radially; the environment of manual feeding is simulated to ensure that there is enough space to correct the product when the chuck is clamped, so that the product offset can be corrected when the chuck is clamped.

[0050] Specific implementation method six: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the fifth embodiment is that a hydraulic damper is radially installed inside the auxiliary loader 2, and the impact head 1 is installed on the head of the auxiliary loader 2 through the hydraulic damper. The spring hydraulic damper connection method is selected to ensure flexible connection, simulate the manual loading environment to ensure that there is enough space to correct the product when the chuck is clamped, and the product offset can be corrected when the chuck is clamped. Other components and connection relationships are the same as those of the fifth embodiment.

[0051] Specific implementation method seven: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the fifth embodiment is that the impact head 1 is made of rubber. The function is to ensure that there is enough space when the clamp is clamped. The other components and connection relationships are the same as those of the fifth or sixth embodiment.

[0052] Combination Figure 1 to Figure 2 The working principle of the present invention is described:

[0053] The roller is sent to the chuck connected to the machine tool spindle, and the chuck clamps the roller radially; the impact head of the spring pressure rod tightens the roller axially; the six-jaw pneumatic chuck of the chuck is loosened; when the six-jaw pneumatic chuck is clamped again, the radial offset of the roller is corrected and the roller is clamped radially; the spring pressure rod returns to the mechanical zero point; the machine tool spindle rotates to complete the roller chamfering process. After testing, the chamfering circle runout of the hard-turned roller has increased from 0.02mm to 0.005mm, and the chamfering circle runout difference of the same roller has increased from 0.02mm to 0.005mm, which is significantly improved compared with the previous process method. The accuracy fully meets the process requirements, and the quality is stable during the processing, and the processing efficiency and finished product qualification rate are also greatly improved.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller, characterized in that It includes the following steps: S1. Send the roller to the center of the chuck connected to the machine tool spindle, and the chuck clamps the roller in the radial direction; S2, tighten the roller axially through the spring pressure rod; S3, the chuck is loose; S4, the chuck corrects the radial offset of the roller and clamps the roller in the radial direction; S5, the spring pressure rod returns to the mechanical zero point; S6. The machine tool spindle rotates to complete the roller chamfering process.

2. A processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller according to claim 1, characterized in that: Step S1 includes the following steps: S1-1, the manipulator sends the roller to the center of the chuck connected to the machine tool spindle; S1-2, the hydraulic ejector rod installed on the manipulator presses the roller axially; S1-3, the chuck clamps the roller in radial direction; S1-4, hydraulic ejector rod is retracted; S1-5. The robot returns to the mechanical origin.

3. A processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller according to claim 1, characterized in that: The roller chamfering process in step S6 is performed by turning.

4. A processing method for improving the runout accuracy of the chamfering circle of a hard-turned roller according to claim 1, characterized in that: The chuck connected to the machine tool spindle adopts a six-jaw pneumatic chuck.

5. A spring pressure rod, characterized in that: The spring pressure rod is used to implement a processing method for improving the runout accuracy of the chamfer circle of a hard-turned roller as described in claim 1. The spring pressure rod comprises a striker (1), an auxiliary feeder (2) and a nut (3). The auxiliary feeder (2) is a hollow cylinder. The striker (1) is flexibly connected to the auxiliary feeder (2). The outer side of the auxiliary feeder (2) is provided with a thread. The nut (3) is threadedly mounted on the outer side of the auxiliary feeder (2).

6. A spring pressure rod according to claim 5, characterized in that: An oil pressure damper is radially installed inside the auxiliary loader (2), and the impact head (1) is installed on the head of the auxiliary loader (2) through the oil pressure damper.

7. A spring pressure rod according to claim 5, characterized in that: The impact head (1) is made of rubber.

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