A machine clamp type variable depth of cut step counterbore

Abstract

The utility model relates to the technical field of stepped counterbore drill, belongs to a machine clamp formula variable cutting depth stepped counterbore drill, including tool bit, handle, the spacing adjusting assembly connection between tool bit and handle, the tool bit head and handle head all are equipped with blade assembly, the cutting outer circle of the blade assembly of setting in handle head is greater than the cutting outer circle of the blade assembly of setting in tool bit head, the utility model can change the relative depth position of the counterbore step after processing by changing the positional relationship of tool bit and locating bolt, the self locking of tool bit is completed by changing the limiting position of locating bolt, realize the relative depth adjustable of counterbore step, guarantee the connection stability of tool bit, cutting is stable, ensure the processing surface quality and cutting efficiency, the utility model can dismantle the indexable blade of handle position and carry out single counterbore, realize one tool multi -use, reduce the tool cost, convenient to use, and the processing efficiency is high, the cutting blade can be indexed, and the overall life is high.

Description

Technical Field

[0001] This utility model relates to the field of stepped reaming drill technology, and belongs to a mechanically clamped variable depth stepped reaming drill. Background Technology

[0002] Stepped reamers are generally used for machining blind holes in nylon embedded sleeves (nylon sleeves) in railway sleepers, or for machining stepped holes in industries such as machinery, chemicals, and automobiles. Currently, these stepped reamers typically use integral high-speed steel, welded carbide, and a mechanically clamped structure. However, existing reamers have the following disadvantages: Whether it's a welded, integral high-speed steel, or existing mechanically clamped structure, the effective tool length is fixed, and the relative position of the cutting edge at the tool step is also fixed. When machining blind holes, if the enlargement depth of the first hole section is fixed, the relative depth position of the second hole section cannot be flexibly changed, resulting in a single function and preventing the tool from being used for multiple purposes. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a mechanically clamped variable depth stepped reamer.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This application provides a mechanically clamped variable depth step reamer, including a cutter head and a shank. The cutter head and the shank are connected by a spacing adjustment component. Both the head of the cutter head and the head of the shank are provided with blade assemblies. The cutting outer diameter of the blade assembly located at the head of the shank is larger than the cutting outer diameter of the blade assembly located at the head of the cutter head.

[0005] Preferably, the spacing adjustment component includes a threaded connector fixedly connected to the tail of the cutter head, and the inside of the cutter shank has two internal threads, namely, internal thread one and internal thread two, with opposite directions of rotation. Internal thread one is connected to the threaded connector through a threaded engagement, and internal thread two is connected to a positioning bolt.

[0006] Preferably, the blade assembly includes a plurality of blade slots and a plurality of indexable blades, wherein the indexable blades are detachably connected to the blade slots and are arranged in a one-to-one correspondence with the blade slots.

[0007] Preferably, the blade groove includes a groove bottom surface and multiple positioning surfaces, the size of the groove bottom surface matches the size of the indexing blade, and the included angle of the positioning surfaces is consistent with the corresponding angle of the indexing blade.

[0008] Preferably, the indexing blade is provided with a positioning hole, and the blade groove is provided with a threaded hole. The indexing blade is installed in the blade groove by a screw, and the screw passes through the positioning hole of the indexing blade and engages with the threaded hole of the blade groove.

[0009] Preferably, the outer radius of the tool holder base is 1-3 mm smaller than the maximum outer radius of the indexing blade of the tool head.

[0010] Preferably, the number of blade slots is set to 2 to 4.

[0011] Preferably, both the head of the cutter head and the head of the cutter shank are provided with spiral chip removal grooves that are arranged synchronously with the indexing blade. The spiral angle of the spiral chip removal grooves is 14~16° and the number of spiral chip removal grooves is 2~4.

[0012] Preferably, the indexing blade of the cutter head is provided with an angle between it and the central axis of the cutter head, and the angle is 3 to 8°.

[0013] Preferably, the indexing blade of the tool holder has an angle between it and the central axis of the tool holder, and the angle is 0 to 5°.

[0014] Compared with the prior art, this utility model provides a mechanically clamped variable depth stepped reamer, which has the following advantages: 1. This utility model can change the relative depth of the enlarged hole step after machining by changing the positional relationship between the cutter head and the positioning bolt. The cutter head is self-locked by changing the limiting position of the positioning bolt. This allows the relative depth of the enlarged hole step to be adjustable while ensuring the stable connection of the cutter head, smooth cutting, and ensuring the quality of the machined surface and cutting efficiency.

[0015] 2. This utility model allows for single-hole enlargement by removing the indexable insert from the tool holder or by removing the tool head and using the tool holder for single-hole enlargement, achieving multiple uses with one tool, reducing tool costs, facilitating use, and increasing machining efficiency. The cutting insert is indexable, resulting in a long overall lifespan.

[0016] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the assembly structure of a mechanically clamped variable depth stepped reamer according to this utility model; Figure 2 This is a schematic cross-sectional view of a mechanically clamped variable depth stepped reamer according to the present invention. Figure 3 This is a schematic diagram of the blade assembly structure of the cutter head and handle of a mechanically clamped variable depth stepped reamer according to the present invention. Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a side view of the cutter head structure of a mechanically clamped variable depth stepped reamer according to this utility model; Figure 6This is a side view of the tool holder structure of a mechanically clamped variable depth stepped reamer according to the present invention; In the diagram: 1. Cutter head; 2. Cutter holder; 3. Spacing adjustment assembly; 4. Blade assembly; 5. Positioning bolt; 6. Spiral chip removal groove; 21. Internal thread one; 22. Internal thread two; 31. Countersunk thread connector; 41. Blade groove; 42. Indexing blade; 413. Threaded hole; 421. Positioning hole. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0019] See Figures 1-6 This application provides a mechanically clamped variable depth step reamer, including a cutter head 1 and a shank 2. The cutter head 1 and the shank 2 are connected by a spacing adjustment component 3. Both the head of the cutter head 1 and the head of the shank 2 are provided with a blade assembly 4. The cutting outer circle of the blade assembly 4 located at the head of the shank 2 is larger than the cutting outer circle of the blade assembly 4 located at the head of the cutter head 1. When a second-stage step reaming is not required, the blades of the shank 2 can be removed to avoid interference, ensuring that the cutting edge of the cutter 2 body passes smoothly through the first hole section after reaming.

[0020] Specifically, the spacing adjustment component 3 includes a threaded connector 31 fixedly connected to the tail of the cutter head 1. The tool holder 2 has two internal threads, one 21 and the other 22, with opposite directions of rotation. The first internal thread 21 is connected to the threaded connector 31 by a threaded engagement, and a positioning bolt 5 is connected inside the second internal thread 22. When there is an adjustment requirement for the distance between the first hole section and the second hole section, the threaded connector 31 at the tail of the cutter head 1 is screwed into the first internal thread 21 until the relative distance between the cutting edge of the cutter head 1 and the cutting edge of the tool holder 2 is consistent with the processing requirements. Then, the positioning bolt 5 is screwed into the second internal thread 22 until the end face of the positioning bolt 5 is tightly fitted with the end face of the threaded connector 31. The opposite rotation directions of the first internal thread 21 and the second internal thread 22 ensure that when the tool rotates and cuts, the threaded connector 31 is affected by the reverse force, which generates a force that drives the positioning bolt 5 to rotate inward, thereby achieving self-locking and limiting the position, and finally completing the hole enlargement process.

[0021] Specifically, the blade assembly 4 includes a plurality of blade slots 41 and a plurality of indexable blades 42. The indexable blades 42 are detachably connected to the blade slots 41, and the indexable blades 42 are arranged in a one-to-one correspondence with the blade slots 41.

[0022] Specifically, the blade groove 41 includes a groove bottom surface 411 and multiple positioning surfaces 412. The size of the groove bottom surface 411 matches the size of the indexing blade 42, and the included angle of the positioning surfaces 412 is consistent with the corresponding angle of the indexing blade 42. Through the cooperation of the groove bottom surface 411 and multiple positioning surfaces 412, the indexing blade 42 is ensured to be stably positioned.

[0023] Specifically, the indexing blade 42 is provided with a positioning hole 421, and the blade groove 41 is provided with a threaded hole 413. The indexing blade 42 is installed in the blade groove 41 by a screw 414. The screw 414 passes through the positioning hole 421 of the indexing blade 42 and is engaged with the threaded hole 413 of the blade groove 41. The screw 414 facilitates the disassembly and replacement of the indexing blade 42.

[0024] Specifically, the outer radius of the tool holder 2 base is 1-3 mm smaller than the maximum outer radius of the indexable insert 42 of the tool head 1. If the outer radius difference is too small, the tool base base will easily rub against the hole during the drilling process; if it is too large, the bottom surface of the insert will be exposed outside the insert groove, resulting in inadequate support.

[0025] Specifically, the number of blade grooves 41 is set to 2 to 4. The commonly used range for the outer diameter of the cutting tool is within Φ50, and 2 to 4 teeth not only meet the usage requirements but also control costs.

[0026] Specifically, both the head of the cutter head 1 and the head of the cutter shank 2 are provided with spiral chip removal grooves 6 arranged synchronously with the indexing blade 42. The spiral chip removal grooves 6 are used to remove chips during cutting. The spiral angle of the spiral chip removal grooves 6 is 14~16°, and the number of spiral chip removal grooves 6 is 2~4.

[0027] Specifically, the indexable insert 42 of the cutter head 1 has an included angle with the central axis of the cutter head 1, the angle being 3 to 8°. If the angle is too large, the cutter tip is prone to chipping and wear; if the angle is too small, the cutting resistance is too high, which is not conducive to drilling operations.

[0028] Specifically, the indexable insert 42 of the tool holder 2 has an included angle with the central axis of the tool holder 2, the size of which is 0 to 5°. As the secondary step hole-reaming cutting edge, the actual cutting width of the indexable insert 42 is limited, so the included angle may be negligible.

[0029] The working principle of this utility model: In actual machining, according to the distance requirement between the first and second hole sections after reaming, the threaded connector 31 at the tail of the cutter head 1 is screwed into the internal thread 21 until the relative distance between the cutting edge of the cutter head 1 and the cutting edge of the tool holder 2 is consistent with the machining requirements. Then, the positioning bolt 5 is screwed into the internal thread 22 until the end face of the positioning bolt 5 is tightly fitted with the end face of the threaded connector 31. The internal threads 21 and 22 are set in opposite directions to ensure that when the tool rotates and cuts, the threaded connector 31 is affected by the reverse force, which generates a force that drives the positioning bolt 5 to rotate inward, thereby achieving self-locking and limiting the position, and finally completing the reaming machining.

[0030] When the required distance between the two hole sections in the reaming process is different, the relative distance between the cutting edge of the tool head and the cutting edge of the tool holder is changed by changing the depth of the threaded connector 31. Then, the depth of the positioning bolt 5 screwed into the internal thread 22 is adjusted accordingly to complete the self-locking limit of the tool head 1, so as to flexibly change the relative depth position of the two stepped hole sections after reaming.

[0031] When enlarging a single hole, the indexing insert at the cutter head or shank position can be removed to achieve the purpose of using one tool for multiple purposes.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mechanically clamped variable depth stepped reamer, characterized in that: It includes a cutting head (1) and a shank (2). The cutting head (1) and the shank (2) are connected by a spacing adjustment component (3). Both the head of the cutting head (1) and the head of the shank (2) are provided with blade assemblies (4). The cutting outer circle of the blade assembly (4) provided on the head of the shank (2) is larger than the cutting outer circle of the blade assembly (4) provided on the head of the cutting head (1). The spacing adjustment component (3) includes a threaded connector (31) fixedly connected to the tail of the cutter head (1). The cutter handle (2) has two internal threads with opposite directions, namely, internal thread one (21) and internal thread two (22). The internal thread one (21) is connected to the threaded connector (31) by thread engagement. The internal thread two (22) is connected to a positioning bolt (5).

2. The clamp-on type variable depth stepped reamer as described in claim 1, characterized in that: The blade assembly (4) includes several blade slots (41) and several indexable blades (42). The indexable blades (42) are detachably connected to the blade slots (41), and the indexable blades (42) are arranged in a one-to-one correspondence with the blade slots (41).

3. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: The blade groove (41) includes a groove bottom surface (411) and multiple positioning surfaces (412). The size of the groove bottom surface (411) matches the size of the indexing blade (42), and the included angle of the positioning surface (412) is consistent with the corresponding angle of the indexing blade (42).

4. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: The indexing blade (42) is provided with a positioning hole (421), and the blade groove (41) is provided with a threaded hole (413). The indexing blade (42) is installed in the blade groove (41) by a screw (414). The screw (414) passes through the positioning hole (421) of the indexing blade (42) and then engages with the threaded hole (413) of the blade groove (41).

5. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: The outer radius of the base of the tool holder (2) is smaller than the maximum outer radius of the indexing blade (42) of the tool head (1) by 1~3mm.

6. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: The number of blade slots (41) is set to 2 to 4.

7. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: Both the head of the cutter head (1) and the head of the cutter shank (2) are provided with spiral chip removal grooves (6) that are arranged synchronously with the indexing blade (42). The spiral angle of the spiral chip removal grooves (6) is 14~16°, and the number of spiral chip removal grooves (6) is 2~4.

8. The clamp-on type variable depth stepped reamer as described in claim 2, characterized in that: The indexing blade (42) of the cutter head (1) has an angle between it and the central axis of the cutter head (1), and the angle is 3 to 8°.

9. A mechanically clamped variable depth stepped reamer as described in claim 2, characterized in that: The indexing blade (42) of the tool holder (2) has an angle between it and the central axis of the tool holder (2), and the angle is 0 to 5°.

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