Deep hole drilling tool with inner cooling channel

Abstract

The invention relates to the technical field of deep hole machining, in particular to a deep hole drilling tool with an inner cooling channel, which comprises a mounting rod, a drill bit, a mounting sleeve, an adjusting assembly and a positioning assembly. During boring operation, the mounting rod is fixed on an original axis through the positioning assembly by taking a completed drill hole as a positioning reference, so that the mounting rod can provide axial guidance and radial support for the mounting sleeve. Therefore, the mounting sleeve is always kept highly coaxial with the drilling axis in the rotating process, the axis deviation problem caused by tool changing or re-clamping in the traditional process is effectively avoided, and the consistency of the drilling center and the boring center is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of deep hole machining technology, and in particular to a deep hole drill bit with an internal cooling channel. Background Technology

[0002] Deep hole machining technology, as one of the key processes in the mechanical manufacturing field, is widely used in high-end manufacturing scenarios such as aerospace, energy equipment, and precision instruments. From cooling holes for turbine blades in aero-engines and bolt holes for nuclear power pressure vessels to cooling holes for drive motor housings in new energy vehicles, these deep hole structures directly affect the performance and lifespan of core components, generally requiring high dimensional accuracy, positional accuracy, and surface quality. As component structures become increasingly complex and precision requirements continue to rise, higher demands are placed on tool performance, machining efficiency, and precision control.

[0003] In the current technological development, in order to balance processing efficiency and precision, single drilling or boring processes are no longer sufficient to meet the needs. The industry is gradually shifting to a "drill-boring" composite processing mode, hoping to improve processing quality and efficiency by reducing the number of process connections.

[0004] However, during hole machining, if the process requires drilling before boring, workers usually need to change the boring tool or re-clamp the workpiece after drilling. This tool change or fixture change inevitably requires re-alignment, which introduces human or equipment errors. Due to the lack of rigid positioning with the machined hole, the coaxiality accuracy of the hole is difficult to guarantee, leading to deviations between the drilling center and the boring center, which seriously affects the straightness, coaxiality, and dimensional accuracy of the final hole. Summary of the Invention

[0005] Therefore, it is necessary to provide a deep hole drilling tool with an internal cooling channel to address the alignment error caused by repositioning and adjustment during the current drilling-to-boring process.

[0006] The above objectives are achieved through the following technical solutions: A deep hole drill bit with an internal cooling channel, comprising: Mounting rod, the mounting rod being able to rotate about its own axis; A drill bit, which is coaxially and fixedly connected to the mounting rod, and is used to perform drilling operations; The mounting sleeve is coaxially disposed on the outside of the mounting rod, and the mounting sleeve and the mounting rod are capable of relative sliding and relative rotation; A boring tool, wherein the boring tool is slidably connected to the mounting sleeve; An adjustment assembly for driving the boring tool to slide radially along the mounting sleeve to perform a boring operation; The positioning assembly, during boring operations, can fix the mounting rod and the drill bit; the mounting rod can provide axial guidance and radial support for the mounting sleeve.

[0007] Furthermore, the adjustment assembly includes an adjustment cylinder and an adjustment block. The adjustment cylinder is coaxially and slidably disposed between the mounting sleeve and the mounting rod, and the adjustment cylinder is capable of sliding along the axial direction of the mounting sleeve. The adjustment block is slidably connected to the mounting sleeve, and the adjustment block is capable of sliding along the radial direction of the mounting sleeve. The adjustment cylinder is slidably connected to the adjustment block, and the boring tool is fixedly connected to the adjustment block.

[0008] Furthermore, the mounting rod and the mounting sleeve are coaxially clearance-fitted; the gap between the mounting rod and the mounting sleeve accommodates cutting fluid; the mounting sleeve has a through hole; during drilling operations, the through hole allows the cutting fluid to pass through; during boring operations, the positioning component restricts the flow of cutting fluid through the through hole.

[0009] Furthermore, the drill bit is provided with a reflux hole, and the mounting rod is provided with a reflux channel inside; the reflux hole connects the outside of the drill bit and the reflux channel; during drilling operations, the reflux hole allows the cutting fluid to flow to the reflux channel.

[0010] Furthermore, the positioning assembly includes a first sealing unit and a second sealing unit. During drilling operations, the first sealing unit and the second sealing unit allow the cutting fluid to flow to the return channel. The boring tool has an outlet. During boring operations, the first sealing unit and the second sealing unit allow the cutting fluid to flow through the outlet.

[0011] Furthermore, the first sealing unit includes a first elastic ring and a first rubber ring, the first rubber ring being coaxially fixedly disposed on the outside of the first elastic ring; the first elastic ring being coaxially disposed on the outside of the drill bit and fixedly connected to the drill bit; the first elastic ring is capable of deforming under axial compression by the mounting sleeve, and the first rubber ring is capable of deforming when the first elastic ring deforms.

[0012] Furthermore, the second sealing unit includes a second elastic ring and a second rubber ring, the second rubber ring being coaxially fixedly disposed on the outside of the second elastic ring; the second elastic ring being coaxially disposed on the outside of the mounting rod and capable of sliding along the axial direction of the mounting rod; the second elastic ring being capable of deforming under the axial compression of the mounting sleeve, and the second rubber ring being capable of deforming when the second elastic ring deforms.

[0013] Furthermore, the boring tool is configured in multiple groups.

[0014] Furthermore, the through holes are configured in multiple groups.

[0015] Furthermore, the reflux holes are configured in multiple sets.

[0016] The beneficial effects of this invention are: This invention provides a deep hole drilling tool with an internal cooling channel, comprising: a mounting rod, a drill bit, a mounting sleeve, an adjusting assembly, and a positioning assembly. The mounting rod is rotatable about its own axis and serves as the core support structure. The drill bit is coaxially fixedly connected to the mounting rod for performing drilling operations. The mounting sleeve is coaxially disposed on the outside of the mounting rod and is capable of relative sliding and relative rotation with the mounting rod. During the drilling stage, the mounting sleeve and mounting rod are first driven to rotate synchronously, causing the drill bit to rotate synchronously. Subsequently, the mounting sleeve and mounting rod are driven to feed synchronously along the axial direction in the drilling direction, thereby driving the drill bit to perform drilling operations. Further, a boring tool is slidably connected to the mounting sleeve. During the boring stage, the adjusting assembly pushes the boring tool to extend radially from the mounting hole along the mounting sleeve. Then, the mounting sleeve is driven to rotate about its own axis, and the adjusting assembly drives the boring tool to rotate synchronously, thereby driving the boring tool to perform boring operations. During boring operations, the mounting rod is fixed to the original axis by the positioning assembly using the completed borehole as a positioning reference. This allows the mounting rod to provide axial guidance and radial support for the mounting sleeve. Therefore, the mounting sleeve remains highly coaxial with the borehole axis during rotation, effectively avoiding the axis misalignment problem caused by tool changes or reclamping in traditional processes, thus ensuring the consistency between the borehole center and the boring center. Attached Figure Description

[0017] Figure 1 This is an overall schematic diagram of a deep hole drill bit with an internal cooling channel provided in an embodiment of the present invention; Figure 2 for Figure 1 The front view; Figure 3 for Figure 2 Top view; Figure 4 for Figure 3 A sectional view along section AA; Figure 5 for Figure 4 A magnified view of a portion of point X in the middle; Figure 6 for Figure 1 A schematic diagram of the working structure of a boring bar; Figure 7 for Figure 6 The front view; Figure 8 for Figure 7 Top view; Figure 9 for Figure 7A sectional view along section BB. Figure 10 for Figure 8 A sectional view along section CC.

[0018] in: 101. Mounting rod; 102. Drill bit; 111. Mounting sleeve; 112. Mounting hole; 113. Boring cutter; 121. Adjusting cylinder; 122. Adjusting block; 123. First inclined surface; 124. Second inclined surface; 125. Limiting block; 126. Retaining ring; 131. Through hole; 132. Return hole; 133. Return channel; 134. Flow outlet; 211. First elastic ring; 212. First rubber ring; 221. Second elastic ring; 222. Second rubber ring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] The following reference Figures 1 to 10This invention describes a deep-hole drilling tool with an internal cooling channel. The deep-hole drilling tool with an internal cooling channel includes a mounting rod 101, a mounting sleeve 111, and a drill bit 102. The mounting sleeve 111 is coaxially sleeved on the outside of the mounting rod 101, and both are capable of rotating about their own axial direction. The drill bit 102 is coaxially fixed at one end of the mounting rod 101. During the drilling stage, the mounting sleeve 111 and the mounting rod 101 are first driven to rotate synchronously, causing the drill bit 102 to rotate synchronously. Subsequently, the mounting sleeve 111 and the mounting rod 101 are driven to feed synchronously along the axial direction in the drilling direction, thereby driving the drill bit 102 to perform drilling operations.

[0023] Furthermore, the mounting sleeve 111 is capable of sliding along its own axial direction. The mounting sleeve 111 has a radially extending mounting hole 112, within which a boring tool 113 is disposed, capable of sliding radially along the mounting sleeve 111. In addition, the deep hole drill with an internal cooling channel also includes an adjustment assembly and a positioning assembly. After drilling is completed, the positioning assembly adheres tightly to the inner wall of the formed deep hole, firmly positioning the drill bit 102 and the mounting rod 101 at the current hole center, forming a stable rigid support reference. Subsequently, the adjustment assembly pushes the boring tool 113 to extend radially from the mounting hole 112 along the mounting sleeve 111. Then, it drives the mounting sleeve 111 to rotate around its own axial direction, and the linkage adjustment assembly drives the boring tool 113 to rotate synchronously, thereby driving the boring tool 113 to perform boring operations. During the boring process, the radial displacement of the boring tool 113 can be controlled by adjusting the assembly to adjust the radial dimension of the bore; the axial dimension of the bore can be adjusted by controlling the axial displacement of the mounting sleeve 111. Since the entire boring process uses the completed drilled hole as the positioning reference, the mounting rod 101 is fixed to the original axis by the positioning assembly, thus providing axial guidance and radial support for the mounting sleeve 111. Therefore, the mounting sleeve 111 remains highly coaxial with the drilled hole axis during rotation, effectively avoiding the axis misalignment problem caused by tool changes or reclamping in traditional processes, thereby ensuring the consistency between the drilled hole center and the boring hole center.

[0024] In one embodiment, the adjusting assembly includes an adjusting cylinder 121 and an adjusting block 122. The adjusting cylinder 121 is coaxially and slidably disposed between the mounting sleeve 111 and the mounting rod 101. A limiting block 125 is fixedly disposed within the mounting hole 112, extending radially along the mounting sleeve 111. The adjusting block 122 is slidably connected to the limiting block 125, and a boring tool 113 is fixedly connected to the adjusting block 122. Furthermore, the adjusting cylinder 121 has a first inclined surface 123 extending radially away from the mounting sleeve 111; the adjusting block 122 has a second inclined surface 124 extending in the same direction as the first inclined surface 123. Specifically, during the boring stage, the drive adjusting cylinder 121 slides along its own axis toward the adjusting block 122, causing the first inclined surface 123 and the second inclined surface 124 to slide together. This drives the adjusting block 122 to slide radially away from the mounting rod 101 along the mounting sleeve 111, thereby pushing the boring tool 113 to extend radially from the mounting hole 112 along the mounting sleeve 111. Subsequently, the mounting sleeve 111 and the adjusting cylinder 121 are driven to rotate synchronously around their own axes, causing the boring tool 113 to rotate synchronously, thereby driving the boring tool 113 to perform the boring operation.

[0025] Understandably, during the boring process, by controlling the axial displacement of the adjusting sleeve 121 to adjust the radial position of the boring tool 113 on the mounting sleeve 111, the radial dimension of the boring hole can be adjusted. By simultaneously controlling the axial displacement of the mounting sleeve 111 and the adjusting sleeve 121, the axial dimension of the boring hole can be adjusted.

[0026] In one embodiment, the mounting rod 101 and the mounting sleeve 111 are coaxially clearance-fitted, and the gap between the mounting rod 101 and the mounting sleeve 111 contains cutting fluid. The mounting sleeve 111 has a radially extending through hole 131, which connects the outer side of the mounting sleeve 111 and the gap between the mounting rod 101 and the mounting sleeve 111, allowing the cutting fluid to flow from the internal gap through the through hole 131 to the working area of ​​the drill bit 102. Furthermore, the mounting rod 101 has an axially extending return channel 133 inside, and the drill bit 102 has a return hole 132, which connects the outer side of the drill bit 102 and the return channel 133. Specifically, during the drilling stage, the positioning assembly allows the cutting fluid to flow through the through hole 131 to the outer side of the drill bit 102, cooling the drill bit 102 while flushing away drilling debris. Subsequently, the cutting fluid carrying debris enters the return hole 132 on the drill bit 102, flows into the return channel 133 in the mounting rod 101, and is finally discharged through the return channel 133. During the boring stage, the positioning component restricts the flow of cutting fluid through the through hole 131.

[0027] In one embodiment, the positioning assembly includes a first sealing unit and a second sealing unit that allow cutting fluid to flow to the return channel 133 during drill bit 102 operation. The boring tool 113 has an outlet 134 extending radially along the mounting sleeve 111, communicating with the outer side of the mounting sleeve 111 and the gap between the mounting rod 101 and the mounting sleeve 111. During boring operations, the first and second sealing units allow cutting fluid to flow through the outlet 134.

[0028] Furthermore, the first sealing unit includes a first elastic ring 211 and a first rubber ring 212. The first elastic ring 211 is an open ring with its opening facing the drill bit 102. The first rubber ring 212 is coaxially fixedly disposed on the outside of the first elastic ring 211, and the first elastic ring 211 is coaxially disposed on the outside of the drill bit 102 and fixedly connected to the drill bit 102. The second sealing unit includes a second elastic ring 221 and a second rubber ring 222. The second elastic ring 221 is an open ring with its opening facing the mounting rod 101. The second rubber ring 222 is coaxially fixedly disposed on the outside of the second elastic ring 221, and the second elastic ring 221 is coaxially disposed on the outside of the mounting rod 101 and can slide along the axial direction of the mounting rod 101. In addition, a retaining ring 126 is coaxially fixedly disposed on the outside of the mounting rod 101.

[0029] Specifically, during the drilling stage, the drive sleeve 111 slides along its own axial direction toward the drill bit 102, pushing the second elastic ring 221 and the second rubber ring 222 to slide synchronously along the axial direction of the mounting rod 101 until the second elastic ring 221 and the second rubber ring 222 abut against the retaining ring 126. As the mounting sleeve 111 continues to slide, it begins to compress the second elastic ring 221, causing the middle part of the second elastic ring 221 to deform inward along its own radial direction toward the mounting rod 101, which in turn causes the middle part of the second rubber ring 222 to deform inward synchronously, thereby causing the middle part of the second rubber ring 222 to disengage from the inner wall of the mounting sleeve 111, and allowing the cutting fluid to flow through the through hole 131 to the outside of the mounting sleeve 111. Simultaneously, the sliding of the mounting sleeve 111 further compresses the first elastic ring 211, causing the middle portion of the first elastic ring 211 to deform inward along its own radial direction towards the mounting rod 101. This causes the middle portion of the first rubber ring 212 to deform inward synchronously, disengaging the middle portion of the first rubber ring 212 from contact with the inner wall of the deep hole. This allows the cutting fluid to flow to the outside of the drill bit 102, thereby cooling the drill bit 102 while flushing away the debris generated during drilling. Subsequently, the cutting fluid carrying the debris enters the return hole 132 on the drill bit 102, flows into the return channel 133 in the mounting rod 101, and is finally discharged through the return channel 133.

[0030] During the boring stage, the drive sleeve 111 slides in the reverse direction, releasing the pressure on the first elastic ring 211 and the second elastic ring 221. This causes the second rubber ring 222 to return to its original position, with its central portion bulging outwards radially away from the mounting rod 101, re-fitting tightly against the inner wall of the sleeve 111 and blocking the through hole 131. This allows the cutting fluid to flow from the outlet 134 to the outside of the sleeve 111, flushing away debris generated during boring. Simultaneously, the reverse sliding of the sleeve 111 causes the central portion of the first rubber ring 212 to bulge outwards radially away from the mounting rod 101, re-attaching to the inner wall of the deep hole and preventing the cutting fluid from flowing to the outside of the drill bit 102. At the same time, the first rubber ring 212 abutting against the inner wall of the deep hole securely positions the drill bit 102 and the mounting rod 101 at the current hole center, forming a stable rigid support reference. With the continuous injection of cutting fluid, the cutting fluid can flow stably in the gap between the mounting sleeve 111 and the inner wall of the deep hole, effectively carrying away and expelling the debris generated during the boring process. In particular, the reciprocating sliding of the mounting sleeve 111 during the boring process helps to enhance the flow of cutting fluid, effectively preventing debris accumulation.

[0031] In one embodiment, the boring tools 113 are configured in multiple sets, and the multiple sets of boring tools 113 are arranged circumferentially around the central axis of the mounting sleeve 111.

[0032] In one embodiment, the through holes 131 are configured in multiple groups, and the multiple groups of through holes 131 are arranged circumferentially around the central axis of the mounting sleeve 111.

[0033] In one embodiment, the reflux orifice 132 is configured in multiple sets.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A deep hole drilling tool with an in-band cooling channel, characterized in that, The application relates to a drilling and boring device. The device comprises: a mounting rod capable of rotating around its own axis; a drill bit coaxially fixedly connected with the mounting rod, the drill bit being used for performing a drilling operation; a mounting sleeve coaxially arranged outside the mounting rod, the mounting sleeve being capable of relatively sliding and rotating with the mounting rod; a boring cutter slidingly connected with the mounting sleeve; an adjusting assembly used for driving the boring cutter to slide along the radial direction of the mounting sleeve to perform a boring operation; 2. The in-line cold channel deep hole drilling tool of claim 1, wherein, a positioning assembly capable of fixing the mounting rod and the drill bit during the boring operation, the mounting rod being capable of providing axial guidance and radial support for the mounting sleeve.

3. The in-line cold channel deep hole drilling tool of claim 1, wherein, The adjusting assembly comprises an adjusting cylinder coaxially slidingly arranged between the mounting sleeve and the mounting rod, the adjusting cylinder being capable of sliding along the axial direction of the mounting sleeve; an adjusting block slidingly connected with the mounting sleeve, the adjusting block being capable of sliding along the radial direction of the mounting sleeve; the adjusting cylinder and the adjusting block are slidingly connected, and the boring cutter is fixedly connected with the adjusting block.

4. The in-line cold channel deep hole drilling tool of claim 3, wherein, The mounting rod and the mounting sleeve are coaxially gap fitted; a gap between the mounting rod and the mounting sleeve contains cutting fluid; a through hole is formed in the mounting sleeve; during the drilling operation, the through hole allows the cutting fluid to pass; during the boring operation, the positioning assembly limits the cutting fluid from flowing through the through hole.

5. The in-line cold channel deep hole drilling tool of claim 4, wherein, A backflow hole is formed in the drill bit, and a backflow channel is formed in the mounting rod; the backflow hole is connected with the outside of the drill bit and the backflow channel; during the drilling operation, the backflow hole allows the cutting fluid to flow to the backflow channel.

6. The in-line cold channel deep hole drilling tool of claim 5, wherein, The positioning assembly comprises a first sealing unit and a second sealing unit; during the drilling operation, the first sealing unit and the second sealing unit allow the cutting fluid to flow to the backflow channel; a flow port is formed in the boring cutter; during the boring operation, the first sealing unit and the second sealing unit allow the cutting fluid to flow through the flow port.

7. The in-line cold channel deep hole drilling tool of claim 5, wherein, The first sealing unit comprises a first elastic ring and a first rubber ring, the first rubber ring being coaxially fixedly arranged outside the first elastic ring; the first elastic ring is coaxially arranged outside the drill bit and fixedly connected with the drill bit; the first elastic ring is capable of deforming under the axial extrusion of the mounting sleeve, and the first rubber ring is capable of deforming when the first elastic ring deforms.

8. The in-line cold channel deep hole drilling tool of claim 1, wherein, The second sealing unit comprises a second elastic ring and a second rubber ring, the second rubber ring being coaxially fixedly arranged outside the second elastic ring; the second elastic ring is coaxially arranged outside the mounting rod and capable of sliding along the axial direction of the mounting rod; the second elastic ring is capable of deforming under the axial extrusion of the mounting sleeve, and the second rubber ring is capable of deforming when the second elastic ring deforms.

9. The in-line cold channel deep hole drilling tool of claim 3, wherein, The boring cutter is arranged in multiple groups.

10. The in-line cold channel deep hole drilling tool of claim 4, wherein, The through hole is arranged in multiple groups. The backflow hole is arranged in multiple groups.

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