A precision boring tool for machining the upper boss bearing of a crankcase

Abstract

This utility model discloses a precision boring tool for machining crankcase upper boss bearings, including a fixed flange. A main tool body is located on the top of the fixed flange. An adjustable boring tool holder and a precision machining lower support surface tool holder are mounted on the main tool body. An alloy boring bar is located on the top of the main tool body, and an adjustable chamfering tool holder is mounted on the alloy boring bar. The precision machining lower support surface tool holder includes a precision machining lower support surface tool holder body, on which a precision machining lower support surface insert is mounted. This tool is used to perform precision machining of the lower support surface of the workpiece. This utility model controls the insert pressure, cutting depth, and position through axial and radial adjustment screws on the precision machining lower support surface tool holder and the adjustable chamfering tool holder, meeting the machining needs of workpieces of various specifications. The main tool body integrates a multi-functional tool holder, enabling one-stop machining of support surface precision grinding, multi-angle chamfering, and high-precision boring, significantly improving machining efficiency and process integration.

Description

Technical Field

[0001] This utility model mainly relates to the field of crankcase upper boss bearing machining technology, specifically a precision boring tool for machining crankcase upper boss bearings. Background Technology

[0002] The crankshaft is one of the key core components in a refrigerator compressor. The machining accuracy of the boss bearing on the crankshaft directly affects the bearing's installation accuracy, operational stability, and the overall service life of the machine. Precision boring is a crucial process for forming the boss bearing hole.

[0003] Traditional precision boring tools are mostly designed with a fixed structure. In the machining of crankshaft holes, key processes such as fine scraping of the lower support surface and chamfering of the inner and outer surfaces are carried out in a decentralized machining mode. Currently, each machining step needs to be completed through multiple independent processes. From high-precision planar scraping of the lower support surface to chamfering of the inner and outer surfaces, each process needs to be arranged separately, which is time-consuming and labor-intensive. Moreover, the position of the inserts (including axial pressure and radial position) and the cutting depth of traditional precision boring tools are usually determined by changing different specifications of tools. For the machining needs of crankcase boss bearings of multiple specifications and models (such as bearing holes of different diameters and depths), frequent tool changes are required, resulting in low machining efficiency, high changeover costs, and difficulty in meeting the needs of mass production or parallel machining of multiple varieties. Utility Model Content

[0004] This utility model provides a solution that is significantly different from existing technologies, addressing the problem that existing solutions are too simplistic. It mainly provides a precision boring tool for machining crankcase boss bearings, which solves the technical problem mentioned in the background that each machining step in the crankshaft hole machining process needs to be completed through multiple independent processes, and that frequent tool changes are required for machining crankcase boss bearings of various specifications and models.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A precision boring tool for machining a crankcase upper boss bearing includes a fixed flange, a main tool body on the top of the fixed flange, an adjustable boring tool holder and a finishing lower support surface tool holder mounted on the main tool body, an alloy boring bar on the top of the main tool body, and an adjustable chamfering tool holder mounted on the alloy boring bar.

[0007] The finishing lower support surface tool holder includes a finishing lower support surface tool holder body, on which a finishing lower support surface insert is mounted for performing finishing lower support surface cutting operations on the workpiece.

[0008] The adjustable chamfering tool holder includes an adjustable chamfering tool holder body, on which chamfering cutting inserts are mounted. Different chamfering requirements can be met by adjusting the position of the tool holder.

[0009] More preferably, the top of the fixed flange is provided with a plurality of locking screw holes, and each locking screw hole is evenly distributed in a ring array with the vertical center line of the fixed flange as the center.

[0010] More preferably, the outer circumferential wall of the fixed flange is provided with a plurality of counterweight adjustment holes, and each counterweight adjustment hole is evenly distributed in a ring array with the vertical center line of the fixed flange as the center, which can meet the needs of center of gravity balance adjustment during the operation of the device.

[0011] More preferably, the bottom of the fixed flange is provided with an eccentric positioning ring, which can help to accurately adjust the eccentricity during workpiece installation. The bottom surface of the fixed flange is provided with an angular positioning hole, which is used to cooperate with the positioning pin to achieve precise angular alignment between the device and the machine tool or other components, ensuring assembly accuracy.

[0012] More preferably, the bottom end of the tool holder body for finishing the lower support surface is provided with a first axial adjustment screw, and the outer side of the tool holder body for finishing the lower support surface is provided with a first tool holder fixing screw and a first radial adjustment screw.

[0013] More preferably, the bottom end of the adjustable chamfered tool holder is provided with a second axial adjustment screw, and the outer side of the adjustable chamfered tool holder is provided with a second tool holder fixing screw and a second radial adjustment screw.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This precision boring tool is initially positioned by the eccentric locating ring at the bottom of the fixed flange and the center of the machine tool spindle. Combined with the dual positioning mechanism of angular locating holes and locating pins, it can ensure accurate tool installation, laying the foundation for high-precision machining. The axial and radial adjustment screws equipped on the precision-machined lower support surface tool post and the adjustable chamfering tool post can control the insert pressure, cutting depth and radial position, adapting to various workpiece specifications and diverse machining needs, improving versatility. At the same time, the main tool body integrates a variety of functional tool posts, which can complete precision cutting of workpiece support surfaces, multi-angle chamfering and high-precision boring operations in one stop, greatly improving machining efficiency and process integration.

[0016] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a front view structural diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of this utility model from below;

[0020] Figure 4 This is an enlarged schematic diagram of the tool holder structure for precision machining of the lower support surface of this utility model;

[0021] Figure 5 This is an enlarged structural schematic diagram of the adjustable chamfered tool holder of this utility model.

[0022] Numbering on the map:

[0023] 1. Fixed flange; 2. Main tool body; 3. Adjustable boring tool post; 4. Finishing lower support surface tool post; 401. Finishing lower support surface tool post body; 402. First axial adjustment screw; 403. First tool post fixing screw; 404. Finishing lower support surface insert; 405. First radial adjustment screw; 5. Alloy boring bar; 6. Adjustable chamfering tool post; 601. Adjustable chamfering tool post body; 602. Second tool post fixing screw; 603. Second axial adjustment screw; 604. Chamfering insert; 605. Second radial adjustment screw; 7. Locking screw hole; 8. Counterweight adjustment hole; 9. Eccentric positioning ring; 10. Angular positioning hole. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Please refer to the appendix carefully. Figure 1-5 A precision boring tool for machining the upper boss bearing of a crankcase includes a fixed flange 1, a main tool body 2 on the top of the fixed flange 1, an adjustable boring tool holder 3 and a precision machining lower support surface tool holder 4 mounted on the main tool body 2, an alloy boring bar 5 on the top of the main tool body 2, and an adjustable chamfering tool holder 6 mounted on the alloy boring bar 5.

[0027] The finishing lower support surface tool holder 4 includes a finishing lower support surface tool holder body 401. The upper part of the finishing lower support surface tool holder body 401 is provided with a groove that is adapted to the finishing lower support surface cutting tool 404, and the finishing lower support surface cutting tool 404 is assembled in the groove to realize the finishing lower support surface cutting operation of the workpiece.

[0028] The adjustable chamfering tool holder 6 includes an adjustable chamfering tool holder body 601. The upper part of the adjustable chamfering tool holder body 601 is provided with a groove that matches the chamfering cutting insert 604, and the chamfering cutting insert 604 is assembled in the groove. Different chamfering processing requirements can be met by adjusting the position of the tool holder.

[0029] In this embodiment, as Figure 1 As shown, the top of the fixed flange 1 is provided with several locking screw holes 7, and each locking screw hole 7 is evenly distributed in a ring array with the vertical center line of the fixed flange 1 as the center. The ring array layout allows the pressure generated when the screws are tightened to be evenly distributed on the flange surface, effectively avoiding deformation or damage caused by local stress concentration, and improving the stability and reliability of the connection structure.

[0030] In this embodiment, as Figure 1 As shown, a number of counterweight adjustment holes 8 are provided on the outer circumferential wall of the fixed flange 1, and each counterweight adjustment hole 8 is evenly distributed in a ring array with the vertical center line of the fixed flange 1 as the center. By selectively installing or removing counterweights in the counterweight adjustment holes 8 of the ring array, the center of gravity position of the device during operation can be precisely adjusted, effectively avoiding vibration and noise problems caused by the offset of the center of gravity.

[0031] In this embodiment, as Figure 2 and Figure 3 As shown, the bottom of the fixed flange 1 is provided with an eccentric positioning ring 9 for positioning with the center of the machine tool spindle. An eccentric ring is installed on the outer ring to adjust the eccentricity, thereby adjusting the product processing dimensions. The bottom surface of the fixed flange 1 is also provided with an angular positioning hole 10. After the tool is positioned with the center of the spindle through the eccentric positioning ring 9, it is then angularly positioned through the positioning pin and the angular positioning hole 10, thereby ensuring that the tool is accurately installed in a fixed position and ensuring processing accuracy.

[0032] In this embodiment, as Figure 4As shown, the bottom end of the tool holder 401 for finishing the lower support surface is provided with a first axial adjustment screw 402. By rotating the first axial adjustment screw 402, the tool holder 401 for finishing the lower support surface can be driven to make a slight displacement adjustment along the axial direction, thereby precisely controlling the axial pressure or cutting depth of the cutting insert 404 for finishing the lower support surface. The outer side of the tool holder 401 for finishing the lower support surface is provided with a first tool holder fixing screw 403 and a first radial adjustment screw 405. The first tool holder fixing screw 403 is used to lock and fix the tool holder 401 for finishing the lower support surface to the main tool body 2. By adjusting the feed amount of the first radial adjustment screw 405, the radial position of the cutting insert 404 for finishing the lower support surface can be finely adjusted to adapt to different workpiece size requirements and improve the versatility and machining accuracy of the tool holder.

[0033] In this embodiment, as Figure 5 As shown, the bottom end of the adjustable chamfering tool holder 601 is provided with a second axial adjustment screw 603. By rotating this screw, the adjustable chamfering tool holder 601 can be driven to make micro-displacement adjustment along the axial direction, so as to achieve preliminary adjustment of the chamfering depth or position. The outer side of the adjustable chamfering tool holder 601 is provided with a second tool holder fixing screw 602 and a second radial adjustment screw 605. The second tool holder fixing screw 602 is used to lock the adjustable chamfering tool holder 601 to the alloy boring bar 5. By adjusting the feed amount of the second radial adjustment screw 605, the radial position of the chamfering cutting tool 604 can be finely adjusted, thereby adapting to the processing requirements of different chamfering angles and improving the versatility and processing accuracy of the device.

[0034] The specific operating procedure of this utility is as follows: First, the device achieves precise docking with the machine tool spindle through the fixed flange 1: the eccentric positioning ring 9 at the bottom is initially positioned with the center of the machine tool spindle to ensure the radial position reference of the tool system; then, the angular positioning is completed by inserting the positioning pin into the angular positioning hole 10, and the dual positioning mechanism ensures the accuracy of the tool installation position.

[0035] To meet different machining needs, each tool holder can be finely adjusted through axial and radial adjustment mechanisms:

[0036] For the finishing lower support surface tool holder 4, the first tool holder fixing screw 403 on the outer side is used to lock and fix the finishing lower support surface tool holder tool body 401 to the main tool body 2 to ensure the stability of the adjusted position; the first axial adjustment screw 402 at the bottom of the finishing lower support surface tool holder tool body 401 can drive the tool body to move slightly along the axial direction, and accurately control the axial pressure or cutting depth of the finishing lower support surface insert 404; while the first radial adjustment screw 405 adjusts the radial position of the tool body to make the finishing lower support surface insert 404 adapt to the support surface size requirements of different workpieces, and realize the compatible processing of multi-specification workpieces.

[0037] The working logic of the adjustable chamfering tool holder 6 is similar: the second tool holder fixing screw 602 on the outside completes the locking and fixing of the tool body and the alloy boring bar 5; the second axial adjustment screw 603 at the bottom of the adjustable chamfering tool holder tool body 601 drives the tool body to move slightly axially, initially setting the axial position (i.e., chamfering depth) of the chamfering cutting insert 604; the second radial adjustment screw 605 adjusts the position of the chamfering cutting insert 604 through radial displacement to adapt to the processing requirements of different chamfering angles (such as 30°, 45°, etc.) and improve the adaptability of the tool holder to diverse chamfering processes.

[0038] In addition, the counterweight adjustment holes 8 on the outer circumferential wall are also distributed in a ring, which can selectively install or remove the counterweight according to the equipment load (no load, light load or heavy load), accurately adjust the center of gravity of the device, effectively suppress vibration and noise caused by the center of gravity shift, and ensure a smooth processing process.

[0039] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A boring-on-machine tool for machining a crankcase upper boss bearing, comprising a fixed flange (1), characterized in that: The fixed flange (1) is provided with a main tool body (2) on top. The main tool body (2) is equipped with an adjustable boring tool holder (3) and a finishing lower support surface tool holder (4). The main tool body (2) is provided with an alloy boring bar (5) on top. The alloy boring bar (5) is equipped with an adjustable chamfering tool holder (6). The finishing lower support surface tool holder (4) includes a finishing lower support surface tool holder body (401), and a finishing lower support surface insert (404) is mounted on the finishing lower support surface tool holder body (401) for performing finishing lower support surface cutting operations on the workpiece. The adjustable chamfering tool holder (6) includes an adjustable chamfering tool holder body (601), on which chamfering cutting blades (604) are mounted. Different chamfering processing requirements can be met by adjusting the position of the tool holder.

2. A boring bar for machining a deck bearing of a crankcase according to claim 1, characterized in that: The top of the fixed flange (1) is provided with several locking screw holes (7), and each locking screw hole (7) is evenly distributed in a ring array with the vertical center line of the fixed flange (1) as the center.

3. The boring tool according to claim 1, characterized in that: The outer circumferential wall of the fixed flange (1) is provided with several counterweight adjustment holes (8), and each counterweight adjustment hole (8) is evenly distributed in a ring array with the vertical center line of the fixed flange (1) as the center, which can meet the needs of center of gravity balance adjustment during the operation of the device.

4. The boring tool according to claim 1, characterized in that: The bottom of the fixed flange (1) is provided with an eccentric positioning ring (9), which can help to accurately adjust the eccentricity during workpiece installation. The bottom surface of the fixed flange (1) is provided with an angular positioning hole (10), which is used to cooperate with the positioning pin to achieve precise angular alignment between the device and the machine tool or other components, ensuring assembly accuracy.

5. The boring tool according to claim 1, characterized in that: The bottom end of the tool holder body (401) for finishing the lower support surface is provided with a first axial adjustment screw (402), and the outer side of the tool holder body (401) for finishing the lower support surface is provided with a first tool holder fixing screw (403) and a first radial adjustment screw (405).

6. The boring tool according to claim 1, characterized in that: The bottom end of the adjustable chamfering tool holder body (601) is provided with a second axial adjustment screw (603), and the outside of the adjustable chamfering tool holder body (601) is provided with a second tool holder fixing screw (602) and a second radial adjustment screw (605).

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