A drilling device and method for a rocker arm part

Abstract

The present invention discloses a drilling device and method for rocker arm parts, belonging to the technical field of machining. The drilling device includes a base, a drill template, a fixed drill bushing, a positioning boss with a hole, a main positioning pin, a main support platform, an auxiliary support platform, an L-shaped pressing plate with a hole, a column, a fastening nut, a pressing bolt, a positioning pin, an L-shaped pressing plate, an adjustable drill bushing, a lever and a support rod. The processing precision of the present invention is high. By using this device, positioning can be carried out through the machined holes and the casting reference surface, and the processing stiffness can be improved through multiple auxiliary supports to prevent processing deformation, thereby improving the drilling precision and efficiency of parts. The drilling device has a simple structure, is convenient to operate, has low manufacturing and maintenance costs, is suitable for batch production, and significantly improves production efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and particularly relates to a drilling device and method for a rocker arm part. Background Art

[0002] As Figure 1 shown, it is an important structural part on an aircraft, and the machining accuracy of this part plays an important role in the function. This part is made of cast steel, with a complex spatial structure, many spatial dimensions, and high dimensional accuracy and position accuracy for some mating surfaces, reaching H8 level accuracy. Especially for the relative position accuracy of holes a, b, and c as shown in Figure 2 , if the design requirements are not met, the mating quality will be seriously affected. At the same time, since this product is a series of components with similar structures, only the height H is different, and other structures and machining requirements are the same. Traditionally, multiple sets of drilling devices are required to complete the drilling operation, which occupies a large area for tooling storage and is not easy to operate. When machining the above hole positions, since this product is a casting, the quality of the non-machined surface is unstable, and the overall size is small, it is difficult to determine a reliable positioning surface. At the same time, during machining, an assembled fixture is often used. The assembly cycle of the assembled fixture is long and it is heavy, which is not conducive to efficient production. Therefore, during the machining of this part, batches or large quantities of products are often scrapped due to the existence of the above factors. Summary of the Invention

[0003] In order to solve the above problems in the prior art, the present invention designs a special drilling device that can quickly complete the clamping, positioning, and machining of the rocker arm part, and ensure the machining accuracy.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A drilling device for a rocker arm part, comprising a base 1, a drill template 2, a fixed drill bushing 3, a hole-bearing positioning boss 4, a main positioning pin 5, a main support platform 6, an auxiliary support platform 7, a hole-bearing L-shaped pressing plate 8, a column 9, a fastening nut 10, a pressing bolt 11, a positioning pin 12, an L-shaped pressing plate 13, an adjustable drill bushing 14, a lever 15, and a support rod 16.

[0006] The base 1 is made of steel and has an overall square structure, serving as a support and installation platform for all components. It is provided with several bolt holes for installation and fastening and positioning blind holes for positioning.

[0007] The structural form of the drill template 2 is as shown in Figure 9 , and it is provided with mounting holes 2-3 for installing the adjustable drill bushing 14; a depression 2-1 is provided at the lower position of the drill template 2 for overconstraint when installing the part; a boss 2-2 is provided in the middle of the drill template 2, and it is provided with a through hole 2-4 for avoiding the drill bit during machining and bolt holes 2-5 for installing the auxiliary support platform 7.

[0008] The described fixed drill bushing 3 is installed in the hole 2-6 on the drill template 2 and is used to guide the drill bit during drilling.

[0009] The described positioning boss 4 with a hole is in the shape of a stepped shaft. Its small-diameter end is fixedly installed on the base 1, and a pin hole is provided at the large-diameter end of the positioning boss 4 with a hole for the installation of the main positioning pin 5, which plays a role in positioning the hole c of the rocker arm part.

[0010] The described main support platform 6 is in the shape of a stepped shaft. A thread is provided at its small-diameter end, which is screwed into the bolt hole of the base 1. The height of the support on the Q surface of the rocker arm can be adjusted by screwing, which is used to improve the stiffness of the rocker arm during drilling and prevent deformation.

[0011] The described auxiliary support platform 7 is in the shape of a stepped shaft. A thread is provided at its small-diameter end, which is screwed into the bolt hole 2-5 on the drill template 2. The height of the support on the P surface of the rocker arm can be adjusted by screwing, which plays a role in improving the stiffness of the rocker arm during drilling and preventing deformation.

[0012] The described L-shaped pressing plate 8 with a hole, the column 9 and the fastening nut 10 form a set of pressing devices; among them, the column 9 is a cylindrical part with threads at both ends. One end of it is fixedly connected to the bolt hole on the base 1, and the other end passes through the through hole on the L-shaped pressing plate 8 with a hole and is connected to the fastening nut 10, pressing the L-shaped pressing plate 8 with a hole on the L surface of the rocker arm; a rectangular hole is provided on the L-shaped pressing plate 8 with a hole for the drill bit to pass through during drilling.

[0013] The described L-shaped pressing plate 13, the column 9 and the fastening nut 10 form another set of pressing devices; one end of the column 9 is fixedly connected to the bolt hole on the base 1, and the other end passes through the L-shaped pressing plate 13 and is connected to the fastening nut 10, pressing the L-shaped pressing plate 13 on the S surface of the rocker arm to prevent the rocker arm from moving during drilling.

[0014] The described pressing bolt 11 presses the drill template 2 on the base 1. The positioning pin 12 passes through the pin hole at the lower end of the drill template 2 and enters the pin hole on the base 1, playing a positioning role to prevent the position change of the drill template 2 caused by use and improve the accuracy.

[0015] The described adjustable drill bushing 14 is a replaceable drill bushing. For other rocker arm parts with the same structure but only different heights, such as Figure 1 , drill bushings with corresponding lengths can be replaced according to the different heights H to ensure the accuracy and stability of drilling.

[0016] The described lever 15 is a slender rod-shaped part, which is used to adjust the support height of the main support platform 6 or the auxiliary support platform 7 for convenient operation.

[0017] The described support rod 16 is arranged at the lower part of the base 1 and is used to support the operation platform to make the drilling process more comfortable and convenient.

[0018] A method of drilling using the above drilling device, comprising the following steps:

[0019] (1) Install the rocker arm part to be processed on the positioning device. At this time, the Y surface of the rocker arm part fits with the upper surface of the positioning boss 4 with a hole, and the main positioning pin 5 passes through the hole c of the rocker arm part and enters the central hole of the positioning boss 4 with a hole. The N surface of the rocker arm part leans against the vertical surface of the drill template 2 to restrict circumferential rotation.

[0020] (2) Adjust the heights of the main support platform 6 and the auxiliary support platform 7 respectively through the lever 15 so that they are respectively positioned on the Q surface and the P surface of the rocker arm part to improve the overall machining stiffness.

[0021] (3) The pressing device composed of the L-shaped pressing plate 8 with a hole, the column 9 and the fastening nut 10 presses and is arranged on the L surface of the rocker arm part; another set of pressing devices composed of the L-shaped pressing plate 13, the column 9 and the fastening nut 10 presses and is arranged on the S surface of the rocker arm part. The pressing operation is realized through the fastening nut 10 to complete the fastening.

[0022] (4) Process the holes a and b respectively under an ordinary bench drill.

[0023] The beneficial effects of the present invention are:

[0024] 1) High machining accuracy: Using this device, it can be positioned through the machined hole c and the casting reference surface N, and the machining stiffness is improved through multiple auxiliary supports to prevent machining deformation, thereby improving the drilling accuracy and efficiency of the parts.

[0025] 2) The drilling device has a simple structure, is easy to operate, has low manufacturing and maintenance costs, is suitable for batch production, and significantly improves production efficiency. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the rocker arm part to be processed, where (a) is the front view and (b) is the top view.

[0027] Figure 2 It is a three-dimensional view of the rocker arm part to be processed.

[0028] Figure 3 It is a schematic structural diagram of the rocker arm installed on the drilling device.

[0029] Figure 4 It is the front view of the drilling device.

[0030] Figure 5 It is the top view of the drilling device.

[0031] Figure 6 It is a schematic diagram of the front side structure of the drilling device (hiding the pressing device and the part to be processed).

[0032] Figure 7 Schematic diagram of the back structure of the drilling device (the clamping device and the part to be machined are hidden).

[0033] Figure 8 Schematic diagram of the installation of the rocker arm on the drilling device (the clamping device is hidden).

[0034] Figure 9 Structural diagram of the drill template

[0035] In the figure: 1 base, 2 drill template, 3 fixed drill bushing, 4 positioning boss with hole, 5 main positioning pin, 6 main support platform, 7 auxiliary support platform, 8 L-shaped pressing plate with hole, 9 column, 10 fastening nut, 11 pressing bolt, 12 positioning pin, 13 L-shaped pressing plate, 14 adjustable drill bushing, 15 lever, 16 support rod, 2-1 depression, 2-2 boss, 2-3 mounting hole, 2-4 through hole, 2-5 bolt hole, 2-6 hole Specific implementation mode

[0036] The following further describes the specific implementation mode of the present invention in combination with the accompanying drawings and technical solutions.

[0037] It should be understood that the attached drawings are not drawn to scale, but are merely a suitably simplified drawing method for illustrating the basic principles and various features of the present invention. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, directions, positions, and shapes, will be partially determined by the specific application and use environment. In the multiple attached drawings, the same or equivalent components (elements) are labeled with the same reference numerals.

[0038] A drilling device for a rocker arm part includes a base 1, a drill template 2, a fixed drill bushing 3, a positioning boss with hole 4, a main positioning pin 5, a main support platform 6, an auxiliary support platform 7, an L-shaped pressing plate with hole 8, a column 9, a fastening nut 10, a pressing bolt 11, a positioning pin 12, an L-shaped pressing plate 13, an adjustable drill bushing 14, a lever 15, and a support rod 16. When drilling, the following steps are taken:

[0039] (1) Install the rocker arm part to be machined on the positioning device. At this time, the Y surface of the rocker arm part fits with the upper surface of the positioning boss with hole 4, and the main positioning pin 5 passes through the hole c of the rocker arm part and enters the central hole of the positioning boss with hole 4. The N surface of the rocker arm part leans against the vertical surface of the drill template 2 to restrict circumferential rotation.

[0040] (2) According to the characteristic that the surface heights of the castings are inconsistent, adjust the heights of the main support platform 6 and the auxiliary support platform 7 respectively through the lever 15 so that they are respectively fixed on the Q surface and the P surface of the rocker arm part to improve the overall machining stiffness.

[0041] (3) The pressing device composed of the perforated L-shaped pressing plate 8, the column 9 and the fastening nut 10 presses on the L surface of the rocker arm member; another set of pressing devices composed of the L-shaped pressing plate 13, the column 9 and the fastening nut 10 presses on the S surface of the rocker arm member. The pressing operation is realized through the fastening nut 10 to complete the fastening.

[0042] (4) The holes a and b are respectively machined under an ordinary bench drill.

[0043] (5) When it is necessary to replace the rocker arm member to be drilled with different heights H, in order to ensure that the drill bushing has a good guiding effect and prevent the drilling from deflecting, it is necessary to replace the adjustable drill bushing 14 with a more appropriate height, and then complete the drilling process according to the above steps.

Claims

1. A drilling device for a rocker arm part, characterized in that, the device includes a base (1), a drill template (2), a fixed drill bushing (3), a positioning boss with a hole (4), a main positioning pin (5), a main support platform (6), an auxiliary support platform (7), an L-shaped pressing plate with a hole (8), a column (9), a fastening nut (10), an L-shaped pressing plate (13) and an adjustable drill bushing (14); the base (1) is a support and installation platform for all components, and is provided with a plurality of bolt holes for installation and fastening and positioning blind holes for positioning thereon; the drill template (2) is installed on the base (1), and an adjustable drill bushing (14) is installed on its top; a depression (2-1) is provided at a position below the drill template (2) for overconstraint when installing the part; a boss (2-2) is provided in the middle of the drill template (2); the fixed drill bushing (3) is installed on the drill template (2) for guiding the drill bit during drilling; the positioning boss with a hole (4) is in the shape of a stepped shaft, its small-diameter end is fixedly installed on the base (1), and a pin hole is provided at the large-diameter end for installing the main positioning pin (5) to play a positioning role for the hole c of the rocker arm part; the main support platform (6) is in the shape of a stepped shaft, its small-diameter end is provided with a thread and is screwed into the bolt hole of the base (1), and the height of supporting the Q surface on the rocker arm part is adjusted by screwing; the auxiliary support platform (7) is in the shape of a stepped shaft, its small-diameter end is provided with a thread and is installed on the boss (2-2) of the drill template (2), and the height of supporting the P surface on the rocker arm part is adjusted by screwing; the L-shaped pressing plate with a hole (8), the column (9) and the fastening nut (10) form a set of pressing devices; wherein, the column (9) is a cylindrical part with threads at both ends, one end of which is fixedly connected to the bolt hole on the base (1), and the other end passes through the through hole on the L-shaped pressing plate with a hole (8) and is connected to the fastening nut (10) to press the L-shaped pressing plate with a hole (8) on the L surface of the rocker arm part; the L-shaped pressing plate (13), the column (9) and the fastening nut (10) form another set of pressing devices; one end of the column (9) is fixedly connected to the bolt hole on the base (1), and the other end passes through the L-shaped pressing plate (13) and is connected to the fastening nut (10) to press the L-shaped pressing plate (13) on the S surface of the rocker arm part.

2. A drilling device for a rocker arm part according to claim 1, characterized in that, the drilling device further includes a lever (15), and the lever (15) is an elongated rod-shaped part for adjusting the support height of the main support platform or the auxiliary support platform.

3. A drilling device for a rocker arm part according to claim 1 or 2, characterized in that, the drilling device further includes a support rod (16), and the support rod (16) is arranged at the lower part of the base (1) for supporting the operation platform.

4. A drilling device for a rocker arm part according to claim 1 or 2, characterized in that, the drill template (2) is pressed and installed on the base (1) through a pressing bolt (11), and the positioning pin (12) passes through the pin hole at the lower end of the drill template (2) and enters the pin hole on the base (1) to play a positioning role.

5. A drilling device for a rocker arm part according to claim 3, characterized in that, the drill template (2) is pressed and arranged on the base (1) through the pressing bolts (11), and the positioning pins (12) pass through the pin holes at the lower end of the drill template (2) and enter the pin holes on the base (1) to play a positioning role.

6. A drilling device for a rocker arm part according to claim 1, 2 or 5, characterized in that, a through hole for avoiding the drill bit during processing is provided on the boss (2-2); a rectangular hole is provided on the L-shaped pressing plate with holes (8) for the drill bit to pass through during drilling.

7. A drilling device for a rocker arm part according to claim 1, 2 or 5, characterized in that, the adjustable drill bushing (14) replaces the drill bushing with a corresponding length according to the different heights of the rocker arm part to ensure the accuracy and stability of drilling.

8. A drilling method using the drilling device according to any one of claims 1-7, characterized in that, the method comprises the following steps: Step 1: Install the rocker arm part to be processed on the positioning device. At this time, the Y surface of the rocker arm part is attached to the upper surface of the positioning boss with holes (4), and the main positioning pin (5) passes through the hole c of the rocker arm part and enters the central hole of the positioning boss with holes (4). The N surface of the rocker arm part abuts against the vertical surface of the drill template (2) to restrict circumferential rotation; Step 2: Adjust the heights of the main support table (6) and the auxiliary support table (7) respectively through the lever (15) so that they are respectively fixed on the Q surface and the P surface of the rocker arm part to improve the overall machining stiffness; Step 3: A pressing device composed of a L-shaped pressing plate with holes (8), a column (9) and a fastening nut (10) is used to press and set on the L surface of the rocker arm part; another pressing device composed of an L-shaped pressing plate (13), a column (9) and a fastening nut (10) is used to press and set on the S surface of the rocker arm part; Step 4: Process the holes a and b respectively under an ordinary bench drill.

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