Gear hobbing machine tool rest capable of hobbing internal gear and external gear

Abstract

A gear hobbing machine tool rest capable of hobbing an internal gear and an external gear is characterized in that an internal gear hobbing cutter bar is mounted on the tool rest, an internal gear hobbing cutter is mounted on the internal gear hobbing cutter bar through a bearing, the internal gear hobbing cutter is driven by a universal joint and a transmission shaft or a gear, and the internal gear hobbing cutter and a workpiece to be machined do generating motion to machine the internal gear. An external gear can be machined by installing accessories such as an external gear rolling hob and a cutter bar shaft. The tool rest can be used for machining external gears, internal gears and internal and external helical gears with different helical angles and helical directions. The gear hobbing device is particularly suitable for machining large and ultra-large internal gears, good in practicability, low in production cost, wide in application range and capable of being installed on both new and old gear hobbing machines.

Description

Technical Field

[0001] This invention pertains to machine tool equipment, and particularly relates to gear processing equipment. Background Technology

[0002] Currently, gear machining methods generally include: hobbing, gear shaping, gear milling, and heavy-duty gear turning. Among these, hobbing is the most widely used method. Hobbing is simple to operate, has high processing efficiency, high precision, and a wide processing range, but it cannot process internal gears. Gear shaping can process both internal and external gears, but its processing efficiency is low. When machining helical gears, a guide rail with the same angle as the gear and the shaping tool is required, and the helix angle and direction of rotation cannot be easily changed, making it very inflexible. Gear milling has low processing efficiency and poor precision. Heavy-duty gear turning equipment is very expensive and its application is limited. Summary of the Invention

[0003] This invention employs a method of mounting an internal gear hobbing cutter bar on the hobbing machine tool holder, with a dedicated internal gear hobbing cutter mounted at the end of the cutter bar. The internal gear hobbing cutter enters the inner side of the internal gear for generating machining. This solves the problem that current hobbing machines cannot process internal gears. The solution adopted in this invention is to mount an internal gear hobbing cutter bar on the hobbing machine tool holder when machining internal gears. The dedicated internal gear hobbing cutter is mounted at the end of the cutter bar via a bearing. The internal gear hobbing cutter is connected to the power spindle on the tool holder via a universal joint and a transmission rod or gear. The power spindle drives the internal gear hobbing cutter to perform generating machining on the internal gear. By adjusting the hobbing machine settings, internal gears with different numbers of teeth, modules, helix angles, and helix angle directions can be machined. This is particularly suitable for machining large and extra-large internal gears. When machining external gears, a traditional external gear hobbing cutter bar shaft, external gear hobbing cutter, bearing, or independent bearing support can be mounted on the tool holder to machine external gears. Attached Figure Description

[0004] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a cross-sectional view of the internal gear hobbing cutter holder, the internal gear hobbing cutter, and the workpiece being machined. Figure 2 This is a cross-sectional view of an internal gear hob driven by a gear. Figure 3 This is a structural diagram of an internal gear hob driven by a universal joint. Figure 4 This is a structural diagram of an internal gear hob installed below the center line of the tool holder. Figure 5 This is a structural diagram of an internal gear hob located at the center of rotation of the tool holder at a certain angle to the tool holder. Figure 6 This is a structural diagram of an internal gear hob located at the center of the tool holder. Figure 7 This is a structural diagram of the power gearbox located at the upper end of the internal gear hobbing cutter bar. Figure 8This is a structural diagram of a hob for mounting external gears on a tool holder. In the diagram: 1. Internal gear hob holder; 2. Internal gear hob; 3. Bearing; 4. Universal joint; 5. Tool holder; 6. Small slide of the hobbing machine; 7. Workpiece; 8. Workpiece table; 9. Power gearbox; 10. Drive shaft; 11. Splined shaft; 12. T-slot; 13. Positioning groove; 14. External gear hob holder shaft; 15. Bearing bracket; 16. Bearing; 17. External gear hob; 18. Drive gear. Detailed Implementation

[0005] Figure 1 In the embodiment shown, a tool holder (5) with a rotation adjustment angle is installed on the small slide (6) of the gear hobbing machine. The internal gear hobbing cutter bar (1) is installed on the tool holder (5), and the internal gear hobbing cutter (2) is installed on the internal gear hobbing cutter bar (1) through the bearing (3). The internal gear hobbing cutter (2) located inside the workpiece (7) on the workpiece table (8) and the workpiece (7) complete the machining of the internal gear.

[0006] exist Figure 2 In the embodiment shown, power is transmitted through a transmission gear (18) to drive an internal gear hob (2) to cut the workpiece (7).

[0007] exist Figure 3 In the illustrated embodiment, the internal gear hob (2) is connected to the power gearbox (9) via a universal joint (4), drive shaft (10), and the axis of the internal gear hob (2) is arranged at a certain angle to the axis of the drive shaft (10), so that the workpiece (7) does not interfere with the internal gear hob shank (1) and the drive shaft (10) within a certain machining stroke. Power is transmitted through the power gearbox (9), spline shaft (11), universal joint (4), and drive shaft (10) to drive the internal gear hob (2) to rotate for cutting.

[0008] exist Figure 4 In the illustrated embodiment, the internal gear hobbing cutter (2) is located below the rotation center line of the tool holder (5), and the internal gear hobbing cutter bar (1) is fixed to the tool holder (5) via the T-slot (12) and the positioning slide (13). The internal gear hobbing cutter bar (1) can move left and right on the tool holder (5) via the positioning slide (13). After adjusting the angle of the tool holder (5), the internal gear hobbing cutter bar (1) moves to the corresponding position on the tool holder (5) so that the center of the internal gear hobbing cutter (2) is kept on the rotation center line of the workpiece table (8). By adjusting the angle and position of the tool holder (5) and the internal gear hobbing cutter bar (1), internal spur gears and internal gears with different helix angles can be machined.

[0009] exist Figure 5In the illustrated embodiment, the internal gear hob (2) is installed at a certain angle to the tool holder (5), and the internal gear hob (2) is located at the angular rotation center of the tool holder (5). The internal gear hob bar (1) can be fixed on the small slide (6) of the gear hobbing machine. By adjusting the angle of the tool holder (5) to keep the internal gear hob (2) and the workpiece (7) at the correct angle, the internal gear with the corresponding screw angle can be machined.

[0010] exist Figure 6 In the embodiment shown, the internal gear hob (2) is located at the angular rotation center of the tool holder (5), the axis of the internal gear hob (2) is parallel to the tool holder (5), the power gearbox (9) is located on the axis of the internal gear hob (2), the internal gear hob bar can be fixed on the small slide plate (6) of the gear hob, and the internal gear with the corresponding helical angle can be processed by adjusting the angle of the tool holder (5).

[0011] exist Figure 7 In the embodiment shown, the power gearbox (9) is located on the side of the hobbing cutter bar (1), and the axis of the spline shaft (11) is nearly parallel to the axis of the hobbing cutter bar (1). The use of a short transmission shaft (10) reduces the space occupied by the transmission shaft (10) of the hobbing cutter bar (1) and the hobbing cutter (2), and reduces the interference between the transmission shaft (10), the hobbing cutter bar (1), and the workpiece, making it suitable for machining internal gears with longer lengths.

[0012] exist Figure 8 In the illustrated embodiment, a bearing bracket (15) is mounted on the tool holder (5), and the external gear hobbing cutter shaft (14) is mounted on the bearing bracket (15) via a bearing (16). An external gear hobbing cutter (17) is mounted on the external gear hobbing cutter shaft (14). The bearing bracket (15) can move left and right on the tool holder (5) via a T-slot (12) and a positioning slide (13). Power is transmitted through the power gearbox (9), which drives the external gear hobbing cutter shaft (14) to rotate the external gear hobbing cutter (17), thereby achieving the cutting of external gears.

Claims

1. A gear hobbing machine tool head capable of hobbing both internal and external gears, characterized in that, The gear hobbing machine is provided with a cutter holder with rotary adjustment angle installed on the small carriage, the inner gear hobbing cutter bar is installed on the cutter holder, the inner gear hobbing cutter is installed on the inner gear hobbing cutter bar through bearings, the inner side of the workpiece on the workpiece table is machined by the inner gear hobbing cutter, power drives the inner gear hobbing cutter to cut the workpiece through transmission gears, the inner gear hobbing cutter is connected with the power gear box through the universal joint transmission shaft, the axis of the inner gear hobbing cutter and the transmission shaft is at a certain angle, power drives the inner gear hobbing cutter to rotate for cutting through the power gear box spline shaft, universal joint and transmission shaft.

2. A hobbing machine tool holder according to claim 1, characterized in that The inner gear hobbing cutter is below the angle rotary center line of the cutter holder, the T-shaped slot and the positioning sliding groove for fixing the inner gear hobbing cutter bar are arranged on the cutter holder, the inner gear hobbing cutter bar can move left and right on the cutter holder, the angle of the cutter holder and the position of the inner gear hobbing cutter bar are adjusted, and the inner gear with different helix angles and rotation directions is cut.

3. A hobbing machine tool holder according to claim 1, characterized in that The inner gear hobbing cutter is at a certain angle with the cutter holder, the inner gear hobbing cutter is located at the angle rotary center of the cutter holder, and the inner gear hobbing cutter bar is fixed on the cutter holder and the small carriage of the gear hobbing machine.

4. A hobbing machine tool holder according to claim 1, characterized in that The inner gear hobbing cutter is located at the center position of the cutter holder, and the axis of the inner gear hobbing cutter is parallel to the center line of the cutter holder.

5. A hobbing machine tool holder according to claim 1, characterized in that The power gear box is located above the inner gear hobbing cutter bar, and the axis of the spline shaft is parallel to the axis of the inner gear hobbing cutter bar.

6. A hobbing machine tool holder according to claim 1, characterized in that The cutter holder is provided with the cutter bar shaft, bearings, bearing supports and outer gear hobbing cutter for cutting the outer gear.

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