Special cutter device for machining end face of pin shaft hole of rotary platform of excavator
By designing a special tooling device and adopting an eccentric cutter head and CNC programming, the problem of low precision and efficiency in machining the end face of the pin hole on the excavator's slewing platform was solved, achieving efficient and precise machining of the pin hole end face.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG LISHIDE MACHINERY
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-01
AI Technical Summary
In the existing technology, the machining accuracy of the pin hole end face of the excavator slewing platform is substandard and the efficiency is low. In particular, the pin hole end face of the boom lower hinge point and boom cylinder mounting support is prone to burning the tool during machining, resulting in poor surface roughness and failing to meet the design requirements.
A special tool device was designed, including an eccentric tool head and a tool holder. Through CNC programming, the boring machine spindle moves and rotates along the trajectory of the inner wall of the pin hole. Combined with the eccentric structure and the reasonable diameter of the tool holder and the size of the tool head, efficient countersinking is achieved.
It significantly improves the machining accuracy and efficiency of the pin hole end face, with a surface roughness of Ra6.3 and a machining efficiency increase of 12 times, meeting the design requirements.
Smart Images
Figure CN224182143U_ABST
Abstract
Description
A special tool device for machining the end face of the pin hole of an excavator slewing platform Technical Field
[0001] This utility model relates to the field of machining technology, specifically a special tool device for machining the end face of the pin hole of an excavator slewing platform. Background Technology
[0002] The slewing platform, as an important component of an excavator, is used to place and support excavator parts. Its upper part houses all other components except the chassis, mainly including the working device assembly, engine assembly, and hydraulic assembly. The slewing platform has two sets of pivot holes: one at the front end of the longitudinal middle section for the lower hinge point of the boom (boom mounting support hole), and two sets of boom cylinder mounting support holes.
[0003] To ensure proper installation of the pin shaft and tightening of the pin shaft fixing bolts, the end faces of the boom lower hinge point (boom support hole) of the slewing platform and the end faces of the mounting support holes of the two sets of boom cylinders must be countersunk to meet the installation and positioning requirements of the boom lower hinge point and the boom cylinder lower hinge point. This ensures that the fixed pin shaft is correctly installed in place and that the pin shaft fixing bolts are tightened to withstand sudden loads and impacts, and to prevent abnormal noises from occurring between the end face of the pin hole of the boom lower hinge point and the end face of the pin hole of the slewing platform. Summary of the Invention
[0004] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a special tool device for machining the end face of the pin hole of the excavator slewing platform.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A special tooling device for machining the end face of a pin hole on an excavator slewing platform includes a tool, a tool holder, and a cutter head. The tool is installed in a tool fixing groove of the cutter head, and the cutter head fixing hole of the cutter head is connected to the tool holder. The cutter head has an eccentric cutter head fixing hole, and a tool fixing groove is provided at the end of the outer wall of the cutter head away from the cutter head fixing hole. The outer wall of the cutter head has a fastening groove surface, which includes a tool fastening surface and a tool holder fastening surface. The tool fastening surface has a tool fastening threaded hole communicating with the tool fixing groove, and the tool holder fastening surface has a tool holder fastening threaded hole communicating with the cutter head fixing hole. A first fastening screw is internally threaded into the tool holder fastening threaded hole to lock the tool holder, and a second fastening screw is internally threaded into the tool fastening threaded hole to lock the tool.
[0007] Furthermore, the axis of the tool holder fastening threaded hole passes through the axis of the tool disc fixing hole.
[0008] Furthermore, both the first and second fastening screws are internal hexagon screws.
[0009] Furthermore, two tool fastening threaded holes are provided along the direction of the tool fixing groove, and two tool holder fastening threaded holes are provided along the axial direction of the tool disc fixing hole.
[0010] Furthermore, the outer wall of the end of the tool holder connected to the cutter head is provided with an axial tool holder milling surface, and the inner wall of the cutter head fixing hole is provided with a side plane, and the tool holder milling surface mates with the side plane of the inner wall of the cutter head fixing hole.
[0011] Furthermore, the side plane of the inner wall of the cutter head fixing hole is parallel to the tool holder fastening surface and the tool holder milling surface, and the tool holder fastening surface and the tool fastening surface form an obtuse angle structure.
[0012] Furthermore, the cutter extends from both ends of the cutter head, and both ends of the cutter are ground with a main cutting edge and a secondary cutting edge.
[0013] Furthermore, an extension steel plate is welded to the side of the cutting tool. The extension steel plate is thinner than the cutting tool and is connected to the cutting tool fixing groove of the cutting head.
[0014] Furthermore, it also includes a tool holder taper shank, wherein the end of the tool holder away from the cutter head is connected to the tool holder taper shank, and the boring machine spindle is connected through the tool holder taper shank.
[0015] Compared with the prior art, the present invention has the following advantages:
[0016] This specialized tooling device performs countersinking on the pin hole end face, improving the surface finish and ensuring the required machining accuracy in terms of roughness, dimensional accuracy, and form and position tolerances for the end face of the boom lower hinge point (boom support hole) of the rotary platform and the pin shaft end faces of the two sets of boom cylinder mounting supports. The countersinking surface roughness reaches Ra6.3, the tool speed is 200 r / min, and the feed rate is 0.2 mm / r. Its practical effect is significant, with machining efficiency approximately 12 times that of the original tool. Attached Figure Description
[0017] Figure 1 is a schematic diagram of the structure of the part of the rotary platform where the pin hole end face needs to be countersunk.
[0018] Figure 2 is a schematic diagram of the tool device for machining the end face of the uninnovated front pin hole.
[0019] Figure 3 is a structural schematic diagram of a special tool device for machining the end face of the pin hole of an excavator slewing platform according to this utility model.
[0020] Figure 4 is a schematic diagram of the tool holder in this utility model.
[0021] Figure 5 is a schematic diagram of the cutter head structure in this utility model.
[0022] Figure 6 is a schematic diagram of the structure of the cutting tool in this utility model.
[0023] Figure 7 is a schematic diagram of the machining trajectory of the cutting tool device in this utility model.
[0024] In the diagram: End face 1, End face 3, Part 1, End face 4, Part 2, End face 5, Part 5, Part 3, End face 6, End face 2, End face 6, End face 2, Boring bar, Steel bar, M14 socket head cap screw;
[0025] 13. Cutter head, 13.1. Cutter fixing groove, 13.2. Cutter fixing hole, 13.3. Cutter fastening surface, 13.4. Cutter fastening threaded hole, 13.5. Cutter fastening threaded hole, 13.6. Cutter shank, 14. Cutter shank milling surface, 14.1. Cutter, 15. Extension steel plate, 15.1. Fastening screw one, 16. Fastening screw two, 17. Cutter shank taper shank, 18. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0027] The part of the pivot pin hole end face that needs to be countersunk is shown in Figure 1. The pivot platform has end face 1 and end face 9 of the lower hinge point (piston support hole) of the boom, and end face 2, end face 4, end face 6, and end face 8 of the pivot pin hole of the two sets of boom cylinder mounting supports. Parts 1, 2, and 3 are limit blocks used to restrict the axial movement and circumferential rotation of the pivot pin.
[0028] Before technological innovation, the machining method for the end face of the lower hinge point (boom support hole) of the slewing platform and the end face of the pin holes of the two sets of boom cylinder mounting supports was to directly machine the pin hole end face by clamping a high-speed steel (white steel) tool with a boring bar. If the end face diameter is relatively large, the high-speed steel (white steel) tool needs to be adjusted. Due to the large machining end face area, the high-speed steel (white steel) tool has a large contact area, resulting in high machining resistance. Due to factors such as built-up edge during machining, the high-speed steel (white steel) tool is easily burned. To increase the machining range of the pin hole end face, the tool length needs to be extended. As the length of the high-speed steel (white steel) tool increases, tool chatter is easily caused, resulting in extremely poor surface roughness of the machined end face, which cannot meet the design requirements and usage needs. Because the high-speed steel (white steel) tool has a large machining area, a small feed rate, and a low machine tool spindle speed, the countersinking efficiency of the pin hole end face is low.
[0029] As shown in Figure 2, a 16.5mm*16.5mm square hole is radially machined on the boring bar 10 to hold a 16mm*16mm stainless steel strip 11. Two M14 threaded holes are evenly machined along the axis of the boring bar end face, which are connected to the 16.5mm*16.5mm square hole. Two M14 socket head cap screws 12 are screwed into the two M14 threaded holes to clamp the stainless steel strip 11. The 16mm*16mm stainless steel strip has relatively weak strength and rigidity. To ensure the countersinking quality of the pin hole end face, a low cutting allowance is required, with a tool speed of 20 r / min and a feed rate of 0.1 mm / r, resulting in low machining efficiency. Especially when machining the countersinking end face of the boom cylinder mounting bracket, after countersinking one side of the pin hole end face, machining the other side requires changing the tool direction and adjusting the tool, leading to extremely low efficiency.
[0030] To address the issue of substandard machining accuracy and low machining efficiency of the end faces of the boom lower hinge point (boom support hole) and the pin holes of the two sets of boom cylinder mounting supports on the slewing platform, an innovative design was developed to create a special tool device for machining the end faces of the pin holes on the slewing platform.
[0031] As shown in Figure 3, a special tool device for machining the end face of the pin hole of an excavator slewing platform includes a tool 15, a cutter head 13, a tool shank 14, and a tool shank taper shank 18. The tool 15 is installed in the tool fixing groove 13.1 of the cutter head 13. The cutter head fixing hole 13.2 of the cutter head 13 is connected to the tool shank 14. The end of the tool shank 14 away from the cutter head 13 is connected to the tool shank taper shank 18 and is installed and connected to the spindle of a boring machine through the tool shank taper shank 18.
[0032] As shown in Figure 5, the cutter head 13 has an eccentric cutter head fixing hole 13.2. A cutter fixing groove 13.1 is provided at the end of the outer wall of the cutter head 13 away from the cutter head fixing hole 13.2. A fastening groove surface is provided on the outer wall of the cutter head 13, including a cutter fastening surface 13.3 and a cutter bar fastening surface 13.4. The cutter fastening surface 13.3 has a cutter fastening threaded hole 13.5 connecting to the cutter fixing groove 13.1, and the cutter bar fastening surface 13.4 has a cutter bar fastening threaded hole 13.6 connecting to the cutter head fixing hole 13.2. A first fastening screw 16 is internally threaded into the cutter bar fastening threaded hole 13.6 to lock the cutter bar 14, and a second fastening screw 17 is internally threaded into the cutter fastening threaded hole 13.8 to lock the cutter 15.
[0033] Specifically, the axis of the tool holder fastening threaded hole 13.6 passes through the axis of the tool disc fixing hole 13.2.
[0034] Specifically, both fastening screw 16 and fastening screw 17 are internal hexagon screws, which facilitates installation.
[0035] Specifically, two tool fastening threaded holes 13.5 are provided along the direction of the tool fixing groove 13.1, and two tool holder fastening threaded holes 13.6 are provided along the axial direction of the tool disc fixing hole 13.2.
[0036] As shown in Figure 4, the tool holder 14 has an axial milling surface 14.1 on the outer wall of the end where it connects to the cutter head 13. The shape of the cutter head fixing hole 13.2 is the same as the cross-section of the tool holder 14 at the milling surface 14.2. The inner wall of the cutter head fixing hole 13.2 has a side plane. The milling surface 14.1 of the tool holder mates with the side plane of the inner wall of the cutter head fixing hole 13.2. The milling surface 14.1 of the tool holder is used to position and fix the tool holder with the inner wall of the cutter head fixing hole 13.2 to prevent circumferential rotation. It is also used to precisely guide and adjust the fixing plate 13, making it easier for the fixing plate 13 to move axially along the tool holder 14, and making it easier for the two ends of the tool 15 to flexibly countersink the pin hole end faces.
[0037] Specifically, the side plane of the inner wall of the cutter head fixing hole 13.2 is parallel to the tool holder fastening surface 13.4 and the tool holder milling surface 14.1. The tool holder fastening surface 13.4 and the tool fastening surface 13.3 form a 120° obtuse angle structure, which provides a large space and makes it very convenient to fasten the screw 17 to lock the tool 15.
[0038] As shown in Figure 6, the cutting tool 15 is used for countersinking the end face of the pin hole. It is made of stainless steel. Both ends of the cutting tool 15 extend out of the cutter head 13. Both ends of the cutting tool 15 are ground with a main cutting edge and a secondary cutting edge, facilitating the direct countersinking of the pin hole end face 6 after countersinking the pin hole end face 2; and the direct countersinking of the pin hole end face 8 after countersinking the pin hole end face 4, resulting in a fast and efficient process. A slightly thinner extension steel plate 15.1 can be welded to the side of the cutting tool 15. This extension steel plate 15.1 is connected to the cutting tool fixing groove 13.1 of the cutter head 13, extending the cutting tool clamping length and increasing the countersinking diameter of the pin hole end face.
[0039] Through CNC programming, the boring machine spindle can move along the circumference of the inner hole of the pin according to a predetermined running trajectory. At the same time, the boring machine spindle rotates around its own axis, as shown in Figure 7. The tool device processes the running trajectory, and the tool holder 14 (boring machine spindle) runs along the trajectory of the inner wall of the pin hole being machined. At the same time, the tool holder 14 rotates itself (boring machine spindle rotates) to countersink the end face of the pin hole. In addition, the cutter head 13 has an eccentric structure, which will inevitably accelerate and improve the efficiency of cutting the end face of the pin hole. The boring machine spindle speed is high at 200 r / min, the feed rate is large at 0.2 mm / r, the cutting area is large, and the efficiency is increased by 12 times.
[0040] Guided by the above technical solution, the tool holder 14 is made to the smallest diameter according to the inner diameter of the pin hole, while ensuring the strength and rigidity of the tool holder 14 itself, so as to maximize the countersinking of the end face of the pin hole; the cutter head 13 is designed with appropriate size and corresponding eccentricity according to the size of the end face of the pin hole.
[0041] The optimal diameter of the tool holder 14 and the tool disc 13, along with their eccentricity, combined with the CNC boring machine spindle's movement along a predetermined trajectory around the inner circle of the pin hole, allow for the perfect and maximized machining of the pin hole end face. This dedicated tooling device for machining pin hole end faces achieves highly efficient machining while ensuring dimensional accuracy, form and position tolerances, and surface roughness. It increases pin hole end face machining efficiency by 12 times, and the tool disc 13 and tool 15 are easy to replace.
[0042] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.
[0043] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0044] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0045] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A special tooling device for machining the end face of a pin hole on an excavator slewing platform, comprising a tool and a tool holder, characterized in that, It also includes a cutter head; the cutter is installed in the cutter fixing groove of the cutter head, and the cutter head fixing hole of the cutter head is connected to the cutter bar; the cutter head is provided with an eccentric cutter head fixing hole, and the cutter fixing groove is provided at the end of the outer wall of the cutter head away from the cutter head fixing hole; the outer wall of the cutter head is provided with a fastening groove surface, the fastening groove surface includes a cutter fastening surface and a cutter bar fastening surface, the cutter fastening surface is provided with a cutter fastening threaded hole communicating with the cutter fixing groove, and the cutter bar fastening surface is provided with a cutter bar fastening threaded hole communicating with the cutter head fixing hole; a fastening screw is connected to the internal thread of the cutter bar fastening threaded hole to lock the cutter bar, and a fastening screw is connected to the internal thread of the cutter fastening threaded hole to lock the cutter.
2. The special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, The axis of the tool holder fastening threaded hole passes through the axis of the tool disc fixing hole.
3. The special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, Both fastening screw one and fastening screw two are internal hexagon screws.
4. The special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, Two tool fastening threaded holes are provided along the direction of the tool fixing groove, and two tool holder fastening threaded holes are provided along the axial direction of the tool disc fixing hole.
5. A special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, The outer wall of the end of the tool holder that connects to the cutter head is provided with an axial tool holder milling surface, and the inner wall of the cutter head fixing hole is provided with a side plane. The tool holder milling surface mates with the side plane of the inner wall of the cutter head fixing hole.
6. A special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 5, characterized in that, The side plane of the inner wall of the cutter head fixing hole is parallel to the tool holder fastening surface and the tool holder milling surface, and the tool holder fastening surface and the tool fastening surface form an obtuse angle structure.
7. A special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, The cutting tool extends from both ends of the cutting head, and both ends of the cutting tool are ground with a main cutting edge and a secondary cutting edge.
8. A special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, An extension steel plate is connected to the side of the cutting tool. The extension steel plate is thinner than the cutting tool and is connected to the cutting tool fixing groove of the cutting head.
9. A special tool device for machining the end face of the pin hole of an excavator slewing platform according to claim 1, characterized in that, It also includes a tool holder taper shank, wherein the end of the tool holder away from the cutter head is connected to the tool holder taper shank, and the boring machine spindle is connected through the tool holder taper shank.