Cutter with replaceable drilling part

Abstract

The utility model belongs to the technical field of cutters, and particularly relates to a cutter with a replaceable drilling part, which comprises a cutter handle, a reaming part and the drilling part, the cutter handle is fixedly connected with the reaming part, and one end, far away from the cutter handle, of the reaming part is detachably connected with a quick-change interface of the drilling part; a cooling channel is formed in the cutter handle in the axial direction, a plurality of centrifugal cooling holes are circumferentially distributed in the outer side wall of the end, close to the drilling part, of the reaming part, a certain angle is formed between the cooling holes and the axis of the reaming part, and the cooling channel and the cooling holes are communicated to form a cooling liquid spraying path. When the drilling part is damaged, only the drilling part needs to be replaced, the whole cutter does not need to be replaced, and the maintenance cost is reduced; in the using process of the machining center, when the drilling part of the cutter is abraded, only the drilling part needs to be replaced, the downtime is shortened, and the production efficiency is improved. In addition, centrifugal force generated by rotation in the cutter machining process enables cooling liquid to form an inclined spraying path in the channel, the cooling effect of a cutting area is effectively improved, and the service life of the cutter is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, and in particular relates to a cutting tool with a replaceable drilling part. Background Technology

[0002] In machining, drilling tools are cutting tools used to drill holes in workpieces. They can be used to drill various materials. The drill first rough-machines the workpiece to form an initial hole, then a reamer is used for finishing to complete the high-precision hole. This process involves stopping the machine to change tools, which consumes considerable time and affects machining efficiency. With continuous technological advancements, integrated drill-reamer tools have emerged, which are widely used in various machining fields because they can complete multiple processes in one operation.

[0003] Chinese patent document CN222058925U discloses a combined drilling and reaming tool, including a tool body, a reamer shank fixedly connected to the end face of the tool body, multiple reamer cutting edges uniformly fixedly connected to the outer surface of the reamer shank, a hollow tool shank fixedly connected to the end face of the reamer shank, and a drill bit fixedly connected to the end face of the hollow tool shank, with a drill groove formed on the outer surface of the drill bit. The drill bit is used to drill a hole in the workpiece. After drilling, the tool is advanced one hollow tool shank distance, at which point the reamer shank contacts the workpiece, and the reamer cutting edges can be used to machine a hole with an H7 precision. This eliminates the need to change multiple tools during machining, saving tool change time and effectively improving production efficiency.

[0004] In the aforementioned patent documents, the integrated drilling and reaming tool can complete drilling and reaming operations in a single setup, improving machining efficiency and accuracy. However, due to the integrated structural design, when the drill bit wears out or is damaged after long-term use, the entire tool needs to be replaced, rather than replacing the drill bit separately, resulting in significant maintenance costs. This is especially true when the tool is connected to the spindle of a machining center; if the drill bit is damaged, the entire tool needs to be removed from the spindle for replacement, which is relatively cumbersome and increases downtime and maintenance costs. Utility Model Content

[0005] The purpose of this utility model is to provide a tool with a replaceable drilling section, which solves the problems of existing integral tool structures where the drill bit is easily worn, requiring the entire tool to be replaced, and when the tool is connected to the spindle of a machining center, if the drill bit is damaged, the entire tool needs to be disassembled and replaced, increasing downtime and maintenance costs and reducing machining efficiency.

[0006] To achieve the above objectives, this utility model provides a tool with a replaceable drilling section, including a tool holder, a reaming section, and a drilling section. The tool holder is fixedly connected to the reaming section, and the end of the reaming section away from the tool holder is detachably connected to the quick-change interface of the drilling section. The tool holder has a cooling channel arranged axially inside, and the outer wall of the reaming section near the drilling section has multiple centrifugal cooling holes distributed circumferentially, so that the cooling holes are at a certain angle to the axis of the reaming section. The cooling channel communicates with the cooling holes to form a coolant spray path.

[0007] Furthermore, the cooling channel includes a main cooling channel and multiple branch channels, which are radially arranged to uniformly guide and distribute the coolant from the main cooling channel to each of the cooling holes.

[0008] Furthermore, the quick-change interface includes a tapered mating section and a locking thread section, with the tapered angle being 3° to 8°.

[0009] Furthermore, the quick-change interface has a double-thread structure, including an anti-loosening thread and a positioning thread. The anti-loosening thread is a trapezoidal thread, and the positioning thread is a triangular thread. The difference in pitch between the two is 0.2 to 0.5 mm.

[0010] Furthermore, the reaming section is provided with 4 to 6 spiral grooves, and the depth of the spiral grooves gradually decreases from the reaming section to the drilling section.

[0011] Furthermore, the spiral grooves are asymmetrically distributed around the axis of the reaming part, and the axial distance between the starting section of the spiral grooves and the outlet of the cooling hole is 1-3 mm.

[0012] Furthermore, the cutting edge surface of the drilling part is provided with a chip-receiving groove. The groove shape is a composite curve structure that is wider at the front and narrower at the back. The front section is a parabolic end, and the rear section is an equidistant spiral segment with a smooth transition between the two.

[0013] The above-mentioned technical solutions of one or more of the replaceable drilling tools provided in this embodiment of the utility model have at least the following technical effects:

[0014] The detachable and replaceable drilling and reaming sections allow for easy replacement of the entire cutting tool when the drilling section becomes worn or damaged, reducing maintenance costs. Furthermore, during machining center use, wear on the drilling section eliminates the need to disassemble and replace the entire tool, minimizing downtime and increasing production efficiency. Additionally, the centrifugal force generated by the tool's rotation during machining causes coolant to flow from the cooling channels and cooling holes, creating an inclined coolant spray path that passes through the tool, workpiece, and chips, effectively improving cooling in the cutting area and extending tool life. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 A schematic diagram of the tool structure of the replaceable drilling section provided in this embodiment of the utility model.

[0017] Figure 2 A cross-sectional view of the tool holder and reaming section of a tool with a replaceable drilling section provided in an embodiment of this utility model.

[0018] Figure 3 This is a structural diagram of the first embodiment of the quick-change interface for the drill section of the tool with replaceable drill section provided in this utility model.

[0019] Figure 4 This is a structural diagram of a second embodiment of the quick-change interface for the drill section of a tool with a replaceable drill section provided in this utility model.

[0020] In the diagram, 100 is the tool holder, 110 is the cooling channel, 111 is the main cooling channel, and 112 is the branch channel.

[0021] 200, reaming section; 210, cooling hole; 220, spiral groove;

[0022] 300. Drilling section; 310. Quick-change interface; 311. Locking thread section; 312. Tapered mating section; 313. Double thread structure; 314. Anti-loosening thread; 315. Positioning thread; 320. Chip groove. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0024] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0027] In one embodiment of the replaceable drilling tool of this utility model, please refer to... Figures 1 to 4 The replaceable drilling tool includes a tool holder 100, a reaming section 200, and a drilling section 300. The tool holder 100 is fixedly connected to the reaming section 200, and the end of the reaming section 200 away from the tool holder 100 is detachably connected to the quick-change interface 310 of the drilling section 300. A cooling channel 110 is provided axially inside the tool holder 100. Multiple centrifugal cooling holes 210 are circumferentially distributed on the outer wall of the reaming section 200 near the drilling section 300, so that the cooling holes 210 are at a certain angle to the axis of the reaming section 200. The cooling channel 110 and the cooling holes 210 communicate to form a coolant spray path.

[0028] Specifically, through the detachable and replaceable design of the drilling section 300 and the reaming section 200, when the drilling section 300 becomes worn or damaged, only the drilling section 300 needs to be replaced, instead of the entire tool, thus reducing maintenance costs. Simultaneously, during use in the machining center, when the drilling section 300 of the tool becomes worn, it is not necessary to disassemble and replace the entire tool; only the drilling section 300 needs to be replaced, reducing downtime and improving production efficiency. Furthermore, the centrifugal force generated by the rotation of the tool during machining causes coolant to flow from the cooling channel 110 out of the cooling hole 210, forming an inclined coolant spray path that passes through the tool, workpiece, and chips, effectively improving the cooling effect in the cutting area and extending tool life.

[0029] Furthermore, the cooling channel 110 includes a main cooling channel 111 and multiple branch channels 112. The branch channels 112 are radially arranged to uniformly guide and distribute the coolant from the main cooling channel 111 to each cooling hole 210. Specifically, the radial branch channels 112 ensure that the flow resistance of the coolant reaching each cooling hole 210 is the same, making the coolant flow rate from the circumferentially arranged cooling holes 210 basically consistent, which can cover most of the cutting area and uniformly cool and lubricate the cutting area. At the same time, it prevents large chips from entering the cooling holes 210, reducing the risk of blockage.

[0030] Furthermore, the quick-change interface 310 includes a tapered mating section 312 and a locking thread section 311, with a tapered angle of 3° to 8°. Specifically, the tapered mating section 212 has a tapered angle of 5°, and the reaming part 200 is provided with an internal connecting mechanism that matches the quick-change interface. The tapered angle of the reaming part 300 is also 5°. The locking thread section 211 and the tapered design ensure a stable and reliable connection between the drilling part 300 and the reaming part 200. The locking thread section 211 has a trapezoidal thread or a double thread structure.

[0031] Optionally, the quick-change interface 310 has a double-thread structure 313, including an anti-loosening thread 314 and a positioning thread 315. The anti-loosening thread 314 is a trapezoidal thread, and the positioning thread 315 is a triangular thread, with a pitch difference of 0.2 to 0.5 mm. Specifically, the positioning thread 315 is a 55° triangular thread, and the anti-loosening thread 314 is a 30° trapezoidal thread. The reaming part 200 has an internal trapezoidal thread that mates with the anti-loosening thread 315 and an internal triangular thread that mates with the positioning thread 315. The combination of the two thread types forms a self-locking effect, ensuring a stable connection between the drilling part 300 and the reaming part 200 to prevent loosening.

[0032] Furthermore, the reaming section 200 is provided with 4 to 6 helical grooves 220, the depth of which gradually decreases from the reaming section 200 toward the drilling section 300. Specifically, the depth difference between the tail end and the starting end of the helical groove 220 is 0.5 to 1.2 mm, and the starting end of the helical groove 220 has a smaller diameter, which enhances the rigidity of the starting end of the reaming section 200, resulting in a smaller radial cutting amount, more uniform cutting force, and a shift of the stress peak toward the tool holder 100. In addition, the starting end of the helical groove 220 is not on the same plane as the cooling hole 210 to avoid chip blockage of the cooling hole 210.

[0033] Furthermore, the spiral grooves 220 are asymmetrically distributed around the axis of the reaming section 200, and the axial distance between the starting section of the spiral grooves 220 and the outlet of the cooling hole 210 is 1-3 mm. Specifically, the asymmetrical design of the spiral grooves 220 avoids chip accumulation in the reaming section 200. The axial distance between the starting end of the spiral grooves 220 and the cooling hole 210 ensures that the coolant completes the cooling of the cutting area before the chips are discharged, avoiding high temperature causing chip adhesion; and avoiding interference with the cooling hole 210 during chip removal.

[0034] Furthermore, the cutting edge surface of the drilling section 300 is provided with a chip groove 320. The chip groove 320 has a composite curve structure that is wider at the front and narrower at the back. The front section is a parabolic end, and the rear section is an equidistant helical segment with a smooth transition between the two. Specifically, the wide front section is adapted to the coarse and curled chips generated in the initial stage of the drilling section, and quickly guides the chips into the chip groove 320. The narrow equidistant helical segment at the back causes the chips to be discharged in a directional manner along the helical segment.

[0035] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and 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 cutting tool with a replaceable drilling section, characterized in that, The tool includes a tool holder, a reaming section, and a drilling section. The tool holder is fixedly connected to the reaming section, and the end of the reaming section away from the tool holder is detachably connected to the quick-change interface of the drilling section. The tool holder has a cooling channel along the axial direction inside, and the outer wall of the reaming section near the drilling section has multiple centrifugal cooling holes distributed circumferentially, so that the cooling holes are at a certain angle to the axis of the reaming section. The cooling channel communicates with the cooling holes to form a coolant spray path.

2. The tool with a replaceable drilling section according to claim 1, characterized in that: The cooling channel includes a main cooling channel and multiple branch channels. The branch channels are radial and are used to uniformly guide and distribute the coolant from the main cooling channel to each of the cooling holes.

3. The tool with a replaceable drilling section according to claim 2, characterized in that: The quick-change interface includes a tapered mating section and a locking thread section, with a tapered angle of 3° to 8°.

4. The tool with a replaceable drilling section according to claim 2, characterized in that: The quick-change interface has a double-thread structure, including an anti-loosening thread and a positioning thread. The anti-loosening thread is a trapezoidal thread, and the positioning thread is a triangular thread. The difference in pitch between the two is 0.2 to 0.5 mm.

5. The cutting tool with a replaceable drilling section according to any one of claims 1 to 4, characterized in that: The reaming section is provided with 4 to 6 spiral grooves, and the depth of the spiral grooves gradually decreases from the reaming section to the drilling section.

6. The tool with a replaceable drilling section according to claim 5, characterized in that: The spiral grooves are asymmetrically distributed around the axis of the reaming part, and the axial distance between the starting section of the spiral groove and the outlet of the cooling hole is 1-3mm.

7. The tool with a replaceable drilling section according to claim 1, characterized in that: The cutting edge surface of the drilling part is provided with a chip groove. The chip groove has a composite curve structure that is wider at the front and narrower at the back. The front section is a parabolic end, and the rear section is an equidistant spiral segment with a smooth transition between the two.

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