Method for positioning and grinding inner hole on three-jaw chuck through outer teeth

Abstract

The invention discloses a method for positioning and grinding an inner hole on a three-jaw chuck by using external teeth, which comprises the following steps of: calculating the diameter of a measuring bar according to the modulus and the pressure angle of a clamped gear, and then selecting the diameter of the measuring bar from the diameter approaching values of the measuring bars with national standard specifications; calculating the size of an M value of the gear detected by the measuring bar, and then converting the M value into the size of the outer diameter of the measuring bar; preparing a soft jaw to be installed on a three-jaw chuck, and turning the clamping inner diameter of the three-jaw chuck according to the outer diameter size value of the measuring bar; and the tooth blank of which the measuring bar is arranged in each tooth groove is arranged in the three-jaw chuck, so that the rapid correction of the tooth-shaped axis is completed. The method is simple and good in manufacturability and machining correction efficiency, has wide popularization and practical value, is applied to the rapid tooth profile correction method of the cylindrical gear subjected to carburizing and quenching, and is suitable for outer tooth positioning correction of the pitch circle of the gear and grinding or finish turning of the inner hole and the end face of the gear.

Description

Technical Field

[0001] This invention relates to a method for grinding internal holes using external teeth on a three-jaw chuck. Background Technology

[0002] In the high-precision gear machining process with hardened tooth surfaces, the intermediate carburizing and quenching processes cause deformation of the tooth profile and the central datum hole 1, such as... Figure 1 As shown, the deviation δ between the actual pitch circle 2 and the central reference hole 1 of the gear tooth affects the gear tooth. If the actual pitch circle 2 is not corrected before correcting the central reference hole 1, it will cause uneven distribution of the allowance during gear grinding, and may even cause the gear tooth surface to be scrapped. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a simple method for grinding internal holes using external teeth on a three-jaw chuck.

[0004] The technical solution of this invention to solve the above-mentioned technical problems is: a method for external tooth positioning and grinding of inner holes on a three-jaw chuck, a method for correcting the outer diameter of a measuring rod by placing multiple measuring rods in the tooth grooves, calculating the outer diameter of the measuring rods, and clamping them using a three-jaw chuck, specifically including the following steps:

[0005] 1) Calculate the diameter φ1 of the gauge bar based on the module and pressure angle of the clamping gear, and then select it from the range of gauge bar diameters close to those in the national standard specifications;

[0006] 2) Calculate the M value of the gear as measured by the gauge bar, and then convert the M value into the outer diameter φM of the gauge bar;

[0007] 3) Prepare the soft jaws to be installed on the three-jaw chuck, and machine the clamping inner diameter of the three-jaw chuck according to the outer diameter dimension φM of the measuring bar;

[0008] 4) Load the tooth blank with the measuring bar in each tooth groove into the three-jaw chuck to complete the rapid correction of the tooth profile axis.

[0009] In the above method of positioning and grinding the inner hole on a three-jaw chuck using external teeth, the method for calculating the diameter φ1 of the measuring rod differs for different modules and pressure angles in step 1).

[0010] In the above method of positioning and grinding the inner hole on a three-jaw chuck using external teeth, in step 2), the M value is calculated according to the method for calculating the M value in the "Machining Process Handbook".

[0011] In the above method of positioning and grinding the inner hole on the three-jaw chuck using the external teeth, in step 4), to solve the problem of installing multiple measuring rods at the same time, holes are drilled in the measuring rods and they are connected in series using elastic ropes.

[0012] The beneficial effects of this invention are as follows: This invention utilizes a method for correcting the outer diameter of a measuring rod by placing multiple measuring rods in the tooth groove, calculating the outer diameter of the measuring rods, and clamping them with a three-jaw chuck. This method is simple, has good processability and machining correction efficiency, and has broad applicability and practical value. This invention is applied to a rapid tooth profile correction method for cylindrical gears after carburizing and quenching. This method is suitable for external tooth positioning correction of gear pitch circle, grinding or precision turning of gear inner hole and its end face. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the deviation δ between the actual pitch circle of the tooth and the central reference hole.

[0014] Figure 2 This is a schematic diagram of a three-jaw chuck clamping its teeth by positioning them using a measuring bar.

[0015] Figure 3 This is a schematic diagram of the assembly process.

[0016] Figure 4 This is a schematic diagram showing the conversion of the M value into the outer diameter φM of the gauge bar.

[0017] Figure 5 A schematic diagram showing how to machine the inner diameter of a three-jaw chuck to accommodate the outer diameter φM of the measuring bar.

[0018] Figure 6 This is a schematic diagram showing the state of the gear blank after it has been loaded into the three-jaw chuck.

[0019] Figure 7 This is a schematic diagram of a measuring bar connected in series using elastic ropes. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] A method for grinding internal holes using external teeth on a three-jaw chuck, and a method for correcting the outer diameter of a measuring bar by placing a tooth groove in the measuring bar (e.g.) Figure 2 Multiple gauge bars 3 are placed in the toothed grooves, and the outer diameter of the gauge bars is calculated. A three-jaw chuck is used for clamping. The assembly process is as follows: Figure 3 As shown. Specifically, it includes the following steps:

[0022] 1) Calculate the diameter φ1 of the gauge bar 3 based on the module and pressure angle of the clamping gear 4, and then select a value close to the national standard gauge bar diameter. The gauge bar diameter calculation procedure is shown in Table 1:

[0023]

[0024] 2) Calculate the M value dimension of the gear as measured by gauge bar 3, and then convert the M value into the outer diameter dimension φM of the gauge bar, such as... Figure 4As shown. The M-value was calculated according to the method for calculating the M-value in the "Machining Process Handbook".

[0025] 3) Prepare the soft jaws to be installed on the three-jaw chuck 5. Machine the inner diameter of the three-jaw chuck according to the outer diameter φM of the measuring bar. Figure 5 As shown.

[0026] 4) Load the tooth blank with measuring bar 3 into the three-jaw chuck 5, thus completing the rapid alignment of the tooth profile axis. Figure 6 As shown.

[0027] When using this method, the following should be noted: the calculation method for the diameter φ1 of the bar is different for different modules and pressure angles, and the calculation method for the inner diameter φM of the three-jaw chuck is also different. The clamping force should not be too large when clamping the gear blank, because the allowance and cutting force are small during finishing, and clamping deformation should be avoided and reduced.

[0028] To solve the problem of installing multiple measuring rods 3 simultaneously, holes are drilled in the measuring rods 3 and they are connected in series using elastic ropes 6, such as... Figure 7 As shown, this solves the problem of not being able to take care of both the top and bottom.

[0029] This invention utilizes a method for correcting the outer diameter of a measuring rod by placing multiple measuring rods 3 in the tooth groove, calculating the outer diameter of the measuring rod, and clamping it with a three-jaw chuck 5. This method is simple, has good processability and machining correction efficiency, and has wide applicability and practical value. This invention is applied to a rapid tooth profile correction method for cylindrical gears after carburizing and quenching. This method is suitable for external tooth positioning correction of gear pitch circle, grinding or precision turning of gear inner hole and its end face.

Claims

1. A method for grinding internal holes using external teeth positioning on a three-jaw chuck, characterized in that, The method of calibrating the outer diameter of a gauge bar by placing multiple gauge bars in the toothed grooves, calculating the outer diameter of the gauge bars, and clamping them using a three-jaw chuck includes the following steps: 1) Calculate the diameter φ1 of the gauge bar based on the module and pressure angle of the clamping gear, and then select it from the range of gauge bar diameters close to those in the national standard specifications; 2) Calculate the M value of the gear as measured by the gauge bar, and then convert the M value into the outer diameter φM of the gauge bar; 3) Prepare the soft jaws to be installed on the three-jaw chuck, and machine the clamping inner diameter of the three-jaw chuck according to the outer diameter dimension φM of the measuring bar; 4) Load the tooth blank with the measuring bar in each tooth groove into the three-jaw chuck to complete the rapid correction of the tooth profile axis.

2. The method for grinding an inner hole using external teeth on a three-jaw chuck according to claim 1, characterized in that, In step 1), the method for calculating the diameter φ1 of the bar differs for different modules and pressure angles.

3. The method for grinding an inner hole using external teeth on a three-jaw chuck according to claim 1, characterized in that, In step 2), the M-value is calculated according to the method for calculating the M-value in the "Machining Process Handbook".

4. The method for grinding an inner hole using external teeth on a three-jaw chuck according to claim 1, characterized in that, In step 4), to solve the problem of installing multiple measuring rods at the same time, holes are drilled in the measuring rods and they are connected in series using elastic ropes.

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