A tooling for drilling slanted holes in gears

Abstract

This invention relates to a tooling for drilling inclined holes in gears, belonging to the field of inclined hole drilling tooling. It includes a pressure cap, a connecting device, and a drill bushing. The workpiece is positioned between the pressure cap and the connecting device. The pressure cap has a mating boss that matches the end face of the inclined hole on the workpiece. The mating boss has a mounting hole, the axis of which coincides with the axis of the inclined hole. The drill bushing is positioned within the mounting hole. This invention clamps the workpiece between the connecting device and the pressure cap. The pressure cap has drill bushings matching the position and number of inclined holes to be machined on the workpiece. The drill bushings are close to the entry point of the inclined surface on the workpiece. By using the drill bushings, the drill bit is protected, preventing slippage and breakage on the inclined surface at the entry point. The workpiece, clamped between the pressure cap and the connecting device, can be fixed at various angles, ensuring the axis of the inclined hole is vertically aligned to complete the machining of the desired inclined hole.

Description

Technical Field

[0001] A tooling for drilling inclined holes in gears belongs to the field of tooling for drilling inclined holes. Background Technology

[0002] In some ring-shaped parts, such as gears, design requirements necessitate the machining of multiple inclined holes. The entry point is an inclined plane, and the dimensions and positions of these holes have strict requirements. Currently, the gear is typically clamped horizontally and then adjusted to the angle corresponding to the inclined holes using a universal drilling machine (or machined using a multi-axis machining center / drill-tapping center). In this method, the drill bit is initially inclined when it contacts the gear's entry point. The inclined holes are usually small, and the drill bit is thin. As the drill bit initially penetrates the gear, it experiences an unbalanced force, making it prone to slippage, deflection, and vibration during feed. This affects the dimensional and positional accuracy of the inclined holes, and may even prevent machining altogether. Furthermore, the drill bit is susceptible to bending or breakage due to the deflected force, resulting in low machining efficiency and significantly impacting the gear's product quality. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a tooling for drilling inclined holes in gears that can both protect the drill bit and improve the machining accuracy of inclined holes.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: the tooling for drilling inclined holes in gears includes a pressure cover, a connecting device and a drill sleeve. The workpiece is placed between the pressure cover and the connecting device. The pressure cover is provided with a mating boss that matches the end face of the inclined hole of the workpiece. The mating boss is provided with a mounting hole. The axis of the mounting hole coincides with the axis of the inclined hole. The drill sleeve is placed in the mounting hole.

[0005] Preferably, the workpiece is provided with a locking boss, and a locking groove is formed inside the locking boss, with the locking boss disposed in the locking groove.

[0006] Preferably, the inner diameter of the mounting hole is smaller than the outer diameter of the drill sleeve.

[0007] Preferably, the connecting device includes a bearing, a connecting shaft, a bearing housing, and a nut. One end of the connecting shaft passes through the workpiece, the pressure cap, and is connected to the nut. The other end of the connecting shaft is connected to the bearing. The bearing is located inside the bearing housing. The nut presses the pressure cap, clamping the workpiece between the pressure cap and the connecting shaft.

[0008] Preferably, it also includes a clamp that holds the bearing seat, so that the axis of the drill bushing is set vertically.

[0009] Preferably, the connecting shaft is provided with a bearing section, a support section, a mating section and a connecting section. The bearing section is located at the end and connected to the bearing. The support section, the mating section and the connecting section are arranged sequentially away from the bearing section. The workpiece passes through the mating section and is set on the support section. The diameter of the support section is greater than the diameter of the mating section, which is greater than the diameter of the bearing section and greater than the diameter of the connecting section.

[0010] Preferably, the workpiece is provided with a through hole for the connecting shaft to pass through, the length of the through hole is greater than the length of the mating section, the inclined hole connects to the through hole, and the port of the inclined hole connecting to the through hole is located in the cavity formed by the connecting section and the through hole.

[0011] Compared with existing technologies, the beneficial effects of this technical solution are:

[0012] This invention uses a connecting device and a pressure cap to clamp the workpiece between them. The pressure cap is equipped with a drill sleeve that matches the position and number of the inclined holes to be processed on the workpiece. The drill sleeve is close to the entry point of the inclined surface of the workpiece. By using the drill sleeve to protect the drill bit, it is prevented from slipping or breaking on the inclined surface at the entry point of the workpiece. The workpiece is clamped between the pressure cap and the connecting device, which can achieve fixation at various angles, so that the axis of the inclined hole is set vertically, thereby completing the processing of the desired inclined hole on the workpiece. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a tooling for drilling inclined holes in gears according to the present invention.

[0014] Figure 2 This is a schematic diagram of the structure of the pressure cap of this utility model.

[0015] Figure 3 This is a schematic diagram of the connecting shaft of this utility model.

[0016] Figure 4 This is a schematic diagram of the bearing housing of this utility model.

[0017] Among them: 1. Pressure cap 101, mating boss 102, mounting hole 103, engaging groove 2, drill sleeve 3, gear 301, oblique hole 302, engaging boss 4, bearing 5, connecting shaft 501, bearing section 502, support section 503, mating section 504, connecting section 6, bearing seat 7, nut. Detailed Implementation

[0018] Figures 1-4 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figures 1-4 The present invention will be further described below.

[0019] Reference Figures 1-2The tooling for drilling inclined holes in gears includes a pressure cover 1, a connecting device, and a drill sleeve 2. The workpiece is placed between the pressure cover 1 and the connecting device. The pressure cover 1 is provided with a mating boss 101 that matches the end face of the inclined hole 301 of the workpiece. The mating boss 101 is provided with a mounting hole 102 for mounting the drill sleeve 2. The axis of the mounting hole 102 coincides with the axis of the inclined hole 301.

[0020] Specifically, the workpiece of this utility model is a gear 3. A groove is provided parallel to the circumference on the upper end face of the gear 3. The side of the groove near the center line of the gear 3 is a conical surface, with an angle of 45° between the conical surface and the center line. A slanted hole 301 is drilled on the conical surface, with a diameter of 3mm. The angle between the center line of the slanted hole 301 and the center line of the gear 3 is 70°. A locking boss 302 is formed by an upward protrusion at the center of the gear 3, and the pressure cap 1 is fastened onto the locking boss 302.

[0021] The pressure cap 1 is disc-shaped, with a downward protrusion on its lower side forming a mating boss 101 that matches the inclined surface of the gear 3. A locking groove 103 is formed inside the mating boss 101, and a locking boss 302 is positioned within the locking groove 103. The mating boss 101 is positioned within the groove, with the side of the mating boss 101 closest to the inclined surface serving as the mating surface, thus securing the pressure cap 1 to the upper side of the gear 3. Three countersunk holes are evenly distributed along the circumference of the mating boss 101. A mounting hole 102 is positioned at the center of each countersunk hole, matching the position of the inclined hole 301, and the centerline of the mounting hole 102 coincides with the centerline of the inclined hole 301.

[0022] The drill sleeve 2 of this invention is made of T10 steel, which has excellent wear resistance. It is installed inside the mounting hole 102, the inner diameter of which is smaller than the outer diameter of the drill sleeve 2. The drill sleeve 2 is clamped tightly in the mounting hole 102, and the outer side is tightened by bolts. The drill bit extends into the drill sleeve 2 to drill on the inclined surface of the gear 3, completing the drilling of the inclined hole 301. The diameter of the inclined hole 301 is 3mm. The drill bit is very thin, and the drill sleeve 2 protects the stability of the drill bit during the drilling process, making it less likely to break.

[0023] Reference Figures 3-4 The connecting device includes a bearing 4, a connecting shaft 5, a bearing housing 6, and a nut 7. The connecting shaft 5 is a stepped shaft, and it is provided with a bearing section 501, a support section 502, a mating section 503, and a connecting section 504. The bearing section 501 is located at the end and is rotatably connected to the bearing 4. The bearing 4 is located inside the bearing housing 6. The support section 502, the mating section 503, and the connecting section 504 are arranged sequentially away from the bearing section 501. The gear 3 passes through the mating section 503 and is placed on the support section 502. The diameter of the support section 502 is larger than the diameter of the mating section 503, which is larger than the diameter of the bearing section 501, which is larger than the diameter of the connecting section 504.

[0024] The gear 3 is provided with a through hole for the connecting shaft 5 to pass through. The length of the through hole is greater than the length of the mating section 503. The inclined hole 301 is connected to the through hole. The distance between its connecting opening and the upper end face of the gear 3 is less than the distance between the upper end face of the mating section 503 and the upper end face of the gear 3. When the drill bit passes through the through hole, it will drill into the mating section 503 because the length of the mating section 503 is too long.

[0025] The pressure cap 1 is also provided with a through hole for the connecting shaft 5 to pass through. The upper end of the connecting section 504 is provided with a thread. After the connecting shaft 5 is connected to the bearing 4, gear 3 and pressure cap 1 from bottom to top, it is threadedly connected to the nut 7. The nut 7 presses the pressure cap 1, thereby clamping the gear 3 between the pressure cap 1 and the support section 502.

[0026] This invention utilizes a radial drilling machine to drill a slanted hole 301. The vise of the radial drilling machine clamps the bearing seat 6, causing the entire gear 3 to be inclined relative to the tooling, while keeping the axis of the drill sleeve 2 vertical, thus improving the accuracy of the slanted hole 301. During the drilling process, the degrees of freedom between the connecting shaft 5 and the bearing 4 are not controlled. The drill bit and drill sleeve 2 are vertically positioned, and the drill sleeve 2 self-aligns the position of the slanted hole 301. Experiments have shown that by not controlling the degrees of freedom between the connecting shaft 5 and the bearing 4, and through self-alignment, the drill bit can be effectively protected, reducing the risk of breakage.

[0027] Work process:

[0028] First, install the bearing 4 and bearing housing 6 onto the connecting shaft 5. Then, clamp the bearing housing 6 using the vise of the radial drilling machine and adjust the vise angle. Next, install the gear 3 and the pressure cover 1 onto the connecting shaft 5 and press the pressure cover 1 so that the pressure cover 1 and gear 3 engage and fit against the support section 502 of the connecting shaft 5. Finally, tighten the nut 7 to clamp the gear 3 with the entire tooling.

[0029] After clamping, a radial drill is used to machine the inclined hole 301. The pressure cap 1 serves as a drill template, and the drill sleeve 2 guides the drill bit. Drilling directly on the conical surface will not cause slippage or offset, and it can ensure the axial dimensions and angles of the inclined hole 301. After drilling one inclined hole 301, the connecting shaft 5 is rotated to make the next inclined hole 301 face the drill bit.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.

Claims

1. A tooling for drilling inclined holes in gears, characterized in that: The device includes a pressure cap (1), a connecting device, and a drill sleeve (2). The workpiece is placed between the pressure cap (1) and the connecting device. The pressure cap (1) is provided with a mating boss (101) that matches the end face of the inclined hole (301) of the workpiece. The mating boss (101) is provided with a mounting hole (102). The axis of the mounting hole (102) coincides with the axis of the inclined hole (301). The drill sleeve (2) is placed inside the mounting hole (102).

2. The tooling for drilling angled holes for gears according to claim 1, characterized in that: A locking boss (302) is provided on the workpiece, and a locking groove (103) is formed inside the locking boss (101). The locking boss (302) is located in the locking groove (103).

3. The tooling for drilling angled holes for gears according to claim 1, wherein: The inner diameter of the mounting hole (102) is smaller than the outer diameter of the drill sleeve (2).

4. The tooling for drilling angled holes for gears according to claim 1, wherein: The connecting device includes a bearing (4), a connecting shaft (5), a bearing seat (6), and a nut (7). One end of the connecting shaft (5) passes through the workpiece (3), the pressure cap (1), and is connected to the nut (7). The other end of the connecting shaft (5) is connected to the bearing (4). The bearing (4) is set inside the bearing seat (6). The nut (7) presses the pressure cap (1) to clamp the workpiece (3) between the pressure cap (1) and the connecting shaft (5).

5. The tooling for drilling angled holes in a gear according to claim 4, wherein: It also includes a clamp that holds the bearing seat (6) so that the axis of the drill bushing (2) is set vertically.

6. The tooling for drilling angled holes in a gear according to claim 4, wherein: A bearing section (501), a support section (502), a mating section (503), and a connecting section (504) are provided on the connecting shaft (5). The bearing section (501) is located at the end and connected to the bearing (4). The support section (502), the mating section (503), and the connecting section (504) are arranged sequentially away from the bearing section (501). The workpiece passes through the mating section (503) and is located on the support section (502). The diameter of the support section (502) is greater than the diameter of the mating section (503), greater than the diameter of the bearing section (501), and greater than the diameter of the connecting section (504).

7. The tooling for drilling angled holes in a gear according to claim 6, wherein: The workpiece is provided with a through hole for the connecting shaft (5) to pass through. The length of the through hole is greater than the length of the mating section (503). The oblique hole (301) connects to the through hole, and the port of the oblique hole (301) connecting to the through hole is located in the cavity formed by the connecting section (504) and the through hole.

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