Locking and positioning structure of boring cutter

Abstract

The utility model relates to the technical field of machining, and particularly discloses a boring cutter locking and positioning structure which comprises a cutter holder, a boring cutter body, a limiting bolt and a limiting rod, a cutter hole is formed in the cutter holder, the boring cutter body is embedded in the cutter hole, multiple sets of limiting through holes are formed in the two sides of the cutter holder respectively, each set of limiting through hole is communicated with the cutter hole, and the limiting bolt is arranged on the limiting rod. The limiting rods are embedded in the corresponding limiting through holes and penetrate through the tool holes, and the limiting bolts are in threaded connection with the tool apron and embedded in the inner side of the tool apron. The boring cutter is more convenient and faster to disassemble and assemble, the machining difficulty of the boring cutter body and the cutter holder is reduced, the machining cost is reduced, the yield is improved, meanwhile, the stability is high in the machining process, and the boring cutter body is not prone to displacement and rotation.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, and in particular to a boring tool locking and positioning structure. Background Technology

[0002] Currently, a boring bar is a type of boring tool, generally with a round shank structure. It is mainly used for roughing, semi-finishing, and finishing existing holes. The most common applications are internal hole machining, reaming, and contouring. In addition, boring bars can also be used on boring machines, lathes, or milling machines, making them highly adaptable. However, in daily cutting processes, tool loading and unloading are frequent, and the cylindrical pin is subjected to shearing forces. As a result, it often breaks within a year of use, and the repair and disassembly time is long.

[0003] The prior art CN103722395A provides a spline sleeve positioning structure for a milling and boring machine tool mounting mechanism, including an outer shaft with an axial through hole and an inner shaft with one end disposed in the outer shaft through hole. There is a rotational clearance between the inner wall of the outer shaft and the outer wall of the inner shaft. A blind hole is opened on the end face of the inner shaft in the outer shaft. A spline sleeve with one end inserted into the blind hole of the inner shaft is disposed in the outer shaft through hole. At least one keyway is opened on the inner wall of the blind hole along the axial direction from the end face of the inner shaft. A receiving groove for accommodating a key block is opened on the outer wall of the spline sleeve. The key block in the receiving groove is inserted into the keyway. A locking member is provided to lock the inner shaft and the spline sleeve.

[0004] However, in the existing technology, the production of spline locking is quite difficult, which makes the machining of both the cutting tool and the tool holder more difficult, increasing the machining cost and reducing the yield rate. Utility Model Content

[0005] The purpose of this utility model is to provide a boring tool locking and positioning structure, which aims to solve the technical problem that the spline locking production in the prior art is difficult, which makes the machining of both the tool and the tool holder more difficult, increases the machining cost, and also reduces the yield rate.

[0006] To achieve the above objectives, this utility model employs a boring tool locking and positioning structure, comprising a tool holder, a boring tool body, a limiting bolt, and a limiting rod. The tool holder has a tool hole inside, and the boring tool body is embedded in the tool hole. The tool holder has multiple sets of limiting through holes on both sides, and each set of limiting through holes communicates with the tool hole. The limiting rod is embedded in the corresponding limiting through hole and passes through the tool hole. The limiting bolt is threaded to the tool holder and is embedded inside the tool holder.

[0007] The boring bar body has a limiting surface, which is located on the outer wall of the boring bar body.

[0008] The boring tool body also has a round shank step platform, which is located on the outer wall of the boring tool body.

[0009] The boring tool body has a chamfered tip α, which is 6°, and the end of the chamfered tip α has an arc R1 with a radius of 0.2 mm.

[0010] The boring tool body also has a chamfer β, which is 30°.

[0011] The boring tool body also has a tool tip chamfer γ, which is 8°.

[0012] The boring bar body has a chamfer δ on the inner side of the cutting head, the chamfer δ is 6°, and the end of the chamfer δ has an arc R2 with a radius of 0.2mm.

[0013] The distance between the limiting tangent and the center of the boring tool body is 2.6 mm.

[0014] This utility model discloses a boring bar locking and positioning structure. The boring bar body is installed on the tool holder, with the boring bar body embedded inside the tool holder. A limiting rod is embedded in the corresponding limiting through hole according to the length of the boring bar body and the required exposed length of the boring bar body. The limiting rod limits the end of the boring bar body. Simultaneously, a limiting bolt is embedded inside the tool holder. A locking tool is used to rotate and tighten the limiting bolt, which compresses and holds the boring bar body. Under the action of the compressive force, the boring bar body is limited and prevented from being locked during use. In the event of detachment or rotation, the limiting rod and the limiting bolt allow for quick installation and fixation of the boring bar body, and also enable rapid disassembly of the tool holder. The tightening of the limiting bolt on the boring bar body does not rely on the frictional force generated by the rotation of the threads, but rather on the squeezing action between the head of the limiting bolt and the boring bar. This improves the tightening effect, extends service life, and adapts to special environments. The above structure makes assembly and disassembly more convenient and faster, reduces the machining difficulty of the boring bar body and the tool holder, lowers machining costs, and increases yield. Furthermore, it provides high stability during machining, as the boring bar body is less prone to displacement and rotation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a boring tool locking and positioning structure according to the present invention.

[0017] Figure 2 This is a cross-sectional view of a boring tool locking and positioning structure according to this utility model.

[0018] Figure 3 This is a front view of the boring bar body of this utility model.

[0019] Figure 4 This is a schematic diagram of the boring bar body of this utility model.

[0020] Figure 5 This is a right view of the boring bar body of this utility model.

[0021] Figure 6 This is a magnified view of a portion of the boring bar body of this utility model.

[0022] 101-Tool holder, 102-Bore boring tool body, 103-Limit bolt, 104-Limit rod, 105-Tool hole, 106-Limit through hole, 107-Limit cutting surface, 108-Round shank ladder. Detailed Implementation

[0023] Please see Figures 1 to 6 This utility model provides a boring tool locking and positioning structure, including a tool holder 101, a boring tool body 102, a limiting bolt 103, and a limiting rod 104. The tool holder 101 has a tool hole 105 inside, and the boring tool body 102 is embedded in the tool hole 105. The tool holder 101 has multiple sets of limiting through holes 106 on both sides, and each set of limiting through holes 106 communicates with the tool hole 105. The limiting rod 104 is embedded in the corresponding limiting through hole 106 and passes through the tool hole 105. The limiting bolt 103 is threaded to the tool holder 101 and is embedded in the inner side of the tool holder 101.

[0024] In this embodiment, the tool holder 101 mounts the boring tool body 102, embedding the boring tool body 102 into the tool holder 101. The limiting rod 104 is embedded in the corresponding limiting through hole 106 according to the length of the boring tool body 102 and the required exposed length of the boring tool body 102. The limiting rod 104 limits the end of the boring tool body 102. At the same time, the limiting bolt 103 is embedded into the tool holder 101. The limiting bolt 103 is rotated and tightened using a locking tool, and the limiting bolt 103 presses and holds the boring tool body 102. The boring bar body 102 is compressed, and under the action of the compression force, the boring bar body 102 is limited to prevent it from falling off or rotating during use. At the same time, the limiting rod 104 and the limiting bolt 103 can quickly install and fix the boring bar body 102, and can also quickly disassemble the tool holder 101. The tightening of the limiting bolt 103 on the boring bar body 102 does not rely on the friction force generated by the rotation of the thread, but is achieved by the compression action between the head of the limiting bolt 103 and the boring bar, which can improve the tightening effect, extend the service life, and adapt to special environments.

[0025] Furthermore, the boring bar body 102 has a limiting cut surface 107, which is located on the outer wall of the boring bar body 102.

[0026] In this embodiment, the limiting cut surface 107 is pressed and held by the end of the limiting bolt 103, thereby ensuring that the boring tool body 102 will not rotate inside the tool holder 101, improving the pressing stability of the limiting bolt 103 pressing the boring tool body 102. At the same time, the matching between the limiting bolt 103 and the boring tool body 102 can also play a positioning role when the boring tool body 102 is installed.

[0027] Furthermore, the boring bar body 102 also has a round shank step 108, which is located on the outer wall of the boring bar body 102.

[0028] In this embodiment, the round shank ladder 108 improves the machining efficiency of the boring bar body 102 during use, avoiding the cumbersome process of repeatedly replacing the boring bar body 102 or adjusting machining parameters in traditional machining methods, thereby significantly improving machining efficiency and enhancing the versatility and flexibility of the boring bar body 102.

[0029] Furthermore, the boring bar body 102 has a chamfered tip α, which is 6°, and the end of the chamfered tip α has an arc R1 with a radius of 0.2 mm.

[0030] In this embodiment, the chamfer α and the arc R1 allow the tip of the boring bar body 102 to better contact the workpiece, thereby achieving cutting of the inner hole of the workpiece. Simultaneously, the arc R1 allows for precise control of the cutting dimensions, significantly reducing errors and vibration / runout during the cutting process, resulting in a smoother and more uniform machined surface. It also reduces resistance during the cutting process, making cutting smoother, helping to lower cutting temperature and cutting force, and extending the service life of the boring bar body 102. Due to the reduced cutting assistance, the boring bar body 102 can remove material faster, improving cutting efficiency and reducing energy consumption during the cutting process. The arc R1 can distribute cutting force more evenly, reducing wear on the boring bar body 102 during the cutting process, further extending its service life, reducing the frequency and cost of replacing the boring bar body 102, and minimizing damage to the boring bar body 102 caused by vibration and runout.

[0031] Furthermore, the boring bar body 102 also has a chamfer β, which is 30°.

[0032] In this embodiment, the chamfer β can prevent collision between the boring bar body 102 and the workpiece when the boring bar body 102 enters the workpiece, thereby reducing the size of the end of the boring bar body 102 and playing a collision-proof role.

[0033] Furthermore, the boring bar body 102 also has a tip chamfer γ, which is 8°.

[0034] In this embodiment, the chamfer γ of the cutting tip is 8°, making the cutting tip of the boring tool body 102 an acute angle. This results in a relatively small cutting force during cutting, which can reduce vibration and runout during the cutting process and improve machining quality.

[0035] Furthermore, the inner side of the boring bar body 102 has a chamfer δ, the chamfer δ is 6°, and the end of the chamfer δ has an arc R2 with a radius of 0.2 mm.

[0036] In this embodiment, the chamfer δ and the arc R2 can cool the workpiece during cutting. At the same time, the chamfer setting can keep the cutting material in a continuous state, which is beneficial to maintaining the stability of the cutting process and can greatly improve the processing efficiency and processing quality.

[0037] Furthermore, the distance between the center of the limiting cut surface 107 and the center of the boring tool body 102 is 2.6 mm.

[0038] In this embodiment, the distance between the limiting cutting surface 107 and the boring tool body 102 is 2.6mm, which can improve the clamping stability of the boring tool body 102. When the distance is too small or too large, it will affect the clamping stability of the boring tool body 102 and affect the accuracy of workpiece machining.

[0039] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A boring tool locking and positioning structure, characterized in that, The tool holder includes a boring bar body, a limiting bolt, and a limiting rod. The tool holder has a tool hole inside, and the boring bar body is embedded in the tool hole. The tool holder has multiple sets of limiting through holes on both sides, and each set of limiting through holes communicates with the tool hole. The limiting rod is embedded in the corresponding limiting through hole and passes through the tool hole. The limiting bolt is threaded to the tool holder and is embedded on the inner side of the tool holder.

2. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring bar body has a limiting cut surface, which is located on the outer wall of the boring bar body.

3. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring bar body also has a round shank step platform, which is located on the outer wall of the boring bar body.

4. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring tool body has a tool tip chamfer α, which is 6°, and the end of the tool tip chamfer α has an arc R1 with a radius of 0.2 mm.

5. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring tool body also has a chamfer β, which is 30°.

6. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring tool body also has a tool tip chamfer γ, which is 8°.

7. The boring tool locking and positioning structure as described in claim 1, characterized in that, The boring bar body has a chamfer δ on the inner side of the cutting head, the chamfer δ is 6°, and the end of the chamfer δ has an arc R2 with a radius of 0.2mm.

8. The boring tool locking and positioning structure as described in claim 2, characterized in that, The distance between the limiting tangent and the center of the boring bar body is 2.6 mm.

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