External circle combination tool holder

Abstract

This utility model discloses an external cylindrical tool holder, including a combined tool holder and nozzles. The combined tool holder includes a fixed base with a downwardly recessed outer clamping portion on the top and an inner clamping portion on the side. Nozzles are provided on both sides of the fixed base, and the internal water channels of the nozzles are connected to cooling water channels inside the fixed base. During machining, cooling water is transported to the nozzles through the cooling water channels and sprayed onto the tool machining area. This utility model, by setting up a combined tool holder with outer and inner clamping portions, simultaneously fixes an external cylindrical turning tool and an internal boring tool on the same fixed base. The workpiece can be continuously machined for both internal and external diameters in a single clamping operation, reducing one lathe step and one assembly / disassembly operation, thus shortening the overall machining process. It also avoids positioning deviations caused by multiple clamping operations, ensuring the coaxiality and dimensional consistency of the part's internal and external diameters, and reducing the risk of workpiece scrap.

Description

Technical Field

[0001] This utility model relates to the field of machine tool tool holder technology, specifically an external cylindrical combined tool holder. Background Technology

[0002] When using precision CNC lathes to produce mechanical parts, whether turning the outer diameter, boring the inner diameter, or milling the end face, it is necessary to rely on the tool holder to firmly hold and accurately position the tool. Special tools and tool holders must be used to achieve cutting. As the key carrier connecting the machine tool spindle and the tool, the structural design of the tool holder directly determines the processing efficiency and the quality of the parts.

[0003] However, in related technologies, such as Figure 1 As shown, this is a dual-station tool holder for internal bores, which is compatible with the Tsugami machine tool series. The tool holder and the machine tool have obvious defects in their matching: the fixed seat 4 of the tool holder has double internal clamping holes 401, which means that it can only be used with one type of tool, such as an internal boring tool. This means that when machining complex parts that include internal holes and external diameters, it is necessary to use face-machining, that is, to clamp the workpiece first, machine one side, disassemble, flip it over, re-clamp it, and change the tool. This adds an extra loading and unloading process, which increases the overall machining time. Moreover, multiple clamping can easily lead to deviation of the workpiece positioning reference, resulting in out-of-tolerance coaxiality between the internal hole and the external diameter of the part, unstable dimensional accuracy, increased workpiece scrap rate, increased raw material loss cost, and reduced overall yield of the production line. Utility Model Content

[0004] The purpose of this utility model is to provide an external cylindrical combined tool holder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An external cylindrical tool holder includes: A combined tool holder includes a fixed base. The top of the fixed base has a downwardly recessed outer clamping part for fixing an external turning tool. The side of the fixed base has an inner clamping part for fixing an internal boring tool. Through the outer and inner clamping parts, a combined tool holder can simultaneously fix two different types of tools, an internal boring tool and an external turning tool, for internal hole machining and external diameter machining of the workpiece, respectively. This meets the needs of machine tools to complete multiple machining features in a single workpiece clamping, reduces tool change frequency, and improves machining efficiency. Nozzles are provided on both sides of the fixed base. The internal water passage of the nozzle is connected to the cooling water channel provided inside the fixed base. During the processing, cooling water is transported to the nozzle through the cooling water channel and sprayed onto the tool processing area by the nozzle to ensure the cooling effect of the tool during processing.

[0006] Furthermore, the outer clamping part includes a clamping block, and a positioning hole is provided on the upper end face of the bottom of the groove of the outer clamping part. An internal hexagon screw passes through the pre-set through hole above the clamping block from top to bottom and is threadedly connected to the positioning hole at the bottom of the groove of the outer clamping part. An external hexagon screw is provided on the side of the clamping block.

[0007] Furthermore, after the external hexagonal screw passes horizontally through the pre-set mounting hole on the side of the clamping block, it is threadedly connected to the positioning hole opened on the side of the inner wall of the outer clamping part groove. The external turning tool is inserted into the gap between the top of the external hexagonal screw and the inner wall of the outer clamping part groove. By rotating the external hexagonal screw with a tool, the gap between the top of the external hexagonal screw and the inner wall of the outer clamping part groove gradually becomes smaller, thereby tightly clamping the external turning tool in the gap and achieving stable positioning of the external turning tool.

[0008] Furthermore, the inner clamping part includes an inner clamping hole on the side of the fixing seat for inserting a tool bar. One end of the tool bar has an insertion hole for connecting with an inner boring tool. A side fixing hole is provided on the side of the tool bar. A nut screw passes through the corresponding position of the boring tool fixing hole on the side of the fixing seat and engages with the side fixing hole to lock the tool bar and the inner boring tool in the inner clamping hole.

[0009] Furthermore, the cooling water channel includes an upper cooling channel and a lower cooling channel, both of which are located inside the fixed base. The two ends of the upper cooling channel are respectively connected to the internal channels of the nozzles located on the upper sides of the fixed base, and the two ends of the lower cooling channel are respectively connected to the internal channels of the nozzles located on the lower sides of the fixed base.

[0010] Furthermore, the bottom of the fixed base is provided with a cooling water inlet that is connected to the lower cooling channel. External cooling water can enter the lower cooling channel through the cooling water inlet and then be diverted to the nozzles on both sides of the fixed base.

[0011] Furthermore, the cooling water channel also includes a first connecting pipe and a second connecting pipe. The bottom of the first connecting pipe is connected to the lower cooling channel on the right side of the fixed base, and the top is connected to the upper cooling channel on the right side of the fixed base. After the external cooling water source enters the lower cooling channel on the right side through the cooling water inlet at the bottom of the fixed base, a portion of the cooling water can be transported upward to the upper cooling channel on the right side through the first connecting pipe.

[0012] Furthermore, the upper cooling channels are connected by a second connecting pipe. After the external cooling water source enters the lower cooling channel through the cooling water inlet, a portion of the cooling water enters the right upper cooling channel through the first connecting pipe, and then flows to the left upper cooling channel through the second connecting pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model, by setting up a combined tool holder, with an outer clamping part and an inner clamping part on the combined tool holder, synchronously fixes the external turning tool and the internal boring tool on the same fixed base. Compared with the existing dual-station tool holder, the workpiece can continuously complete the internal hole and external circle machining in a single clamping, reducing one lathe process and one assembly and disassembly operation, shortening the overall machining process, and avoiding positioning deviations caused by multiple clamping, ensuring the coaxiality and dimensional consistency of the internal hole and external circle of the part, and reducing the risk of workpiece scrap.

[0014] 2. This utility model, by setting a clamping block, first uses an internal hexagon screw to fix the lateral position of the clamping block, and the external hexagon screw adjusts the gap with the inner wall of the groove through thread transmission. It can support the installation and adaptation of external turning tools of different specifications, and form a squeezing fixation on the tool holder to avoid tool deviation during processing and ensure the machining accuracy of the external circle.

[0015] 3. This utility model, by setting a tool holder that is adapted to the inner clamping hole, ensures that the tool holder is smoothly inserted without radial wobble, providing stable support for the inner hole boring tool, and is fixed by inserting a screw into the side fixing hole from the side, which facilitates the replacement of inner hole boring tools of different specifications.

[0016] 4. This utility model, by setting up a cooling water channel, allows cooling water to be diverted to the lower cooling channel through dual inlets (bottom of the fixed base), and then supplied with water throughout the upper cooling channel through the first connecting pipe and the second connecting pipe. The nozzle outlet is tilted to the machining area to avoid splashing and affecting the workpiece quality, effectively reducing tool wear caused by high temperature, and ensuring machining accuracy and tool life. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the tool holder structure in existing related technologies.

[0018] Figure 2 This is a three-dimensional schematic diagram of the overall structure of this utility model.

[0019] Figure 3 This is a three-dimensional schematic diagram of the tool holder and bushing of this utility model.

[0020] Figure 4 A three-dimensional schematic diagram of the tool holder of this utility model with an internal boring tool and an external turning tool installed.

[0021] Figure 5 This utility model Figure 3 Another perspective on the 3D schematic diagram.

[0022] Figure 6 A three-dimensional schematic diagram of the tool holder for mounting an external turning tool according to this utility model.

[0023] Figure 7 This is a three-dimensional schematic diagram of the clamping block, internal hexagonal screw, external hexagonal screw, and external turning tool of this utility model.

[0024] Figure 8 This is a side sectional view of the upper and lower cooling channels of this utility model.

[0025] Figure 9 This is a side sectional view of the first connecting pipe of this utility model.

[0026] Figure 10 This is a three-dimensional schematic diagram of the cooling channel of this utility model.

[0027] Figure 11 This is a side cross-sectional view of the nozzle of this utility model. Figure 3 3D diagram.

[0028] Figure 12 This is a schematic diagram of the tool holder being installed on a machine tool in Embodiment 2 of this utility model.

[0029] Figure 13 This is a schematic diagram of the machine tool interior in Embodiment 2 of this utility model.

[0030] Figure 14 This is a schematic diagram of the back of the machine tool in Embodiment 2 of this utility model.

[0031] In the diagram: 1-Combined tool holder, 2-Outer clamping part, 3-Inner clamping part, 4-Fixed base, 401-Inner clamping hole, 402-Bore tool fixing hole, 403-Tool holder fixing hole, 5-Tool bar, 501-Insertion hole, 502-Side fixing hole, 6-Machine screw, 7-Clamping block, 8-External hexagonal screw, 9-Internal hexagonal screw, 10-Nozzle, 1001-Flat head screw, 11-Internal boring tool, 12-External turning tool, 13-Cooling water inlet, 14-Lower cooling channel, 15-First connecting pipe, 16-Upper cooling channel, 17-Second connecting pipe. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] In the description of this utility model, it should be noted that the terms "upper end," "lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing 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. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example 1: Please see Figures 1 to 9 This utility model provides a technical solution: An external cylindrical combined tool holder 1 includes a combined tool holder 1, which includes a fixed base 4. Through the outer clamping part 2 on the top and the inner clamping part 3 on the side, the internal boring tool 11 and the external cylindrical turning tool 12 are synchronously fixed, which meets the machine tool's requirement to complete the dual machining of internal hole and external diameter when clamping the workpiece in a single operation. This reduces the frequency of tool changes from the source, avoids clamping errors and time losses caused by frequent tool changes, and greatly improves machining efficiency.

[0036] The outer clamping part 2 is a recessed structure with the top of the fixing seat 4 recessed downwards (e.g., Figure 1 As shown, the adjustable and stable positioning of the external turning tool 12 is achieved through the cooperation of the clamping block 7 and the screw. A positioning hole is pre-formed on the upper end face of the bottom of the groove of the outer clamping part 2, which corresponds to the position of the pre-formed through hole above the clamping block 7. During installation, the hexagonal screw 9 passes through the through hole of the clamping block 7 from top to bottom and is threaded into the positioning hole at the bottom of the groove, initially fixing the clamping block 7 in the groove to ensure its fixed position and provide a reference for the subsequent clamping of the external turning tool 12. A mounting hole is pre-formed on the side of the clamping block 7. After the hexagonal screw 8 passes horizontally through this mounting hole, it is threaded into the positioning hole on the side of the inner wall of the groove of the outer clamping part 2.

[0037] In this embodiment, the external turning tool 12 needs to be inserted into the gap between the top of the external hexagon screw 8 and the inner wall of the groove (e.g., Figure 3As shown), when the operator rotates the external hex screw 8 using a wrench or other tools, the external hex screw 8 will move along the thread direction towards the external turning tool 12, gradually reducing the gap space until the external turning tool 12 is tightly fitted into the gap, achieving a secure fixation of the external turning tool 12 (as shown). Figure 5 (As shown).

[0038] It should be noted that during installation, the clamping block 7 should be assembled first, followed by the tool. After installing the clamping block 7, the external hex screw 8 should be horizontally passed through the reserved mounting hole on the side of the clamping block 7, aligned with the positioning hole on the inner wall of the groove of the outer clamping part 2, and slowly screwed in until a gap is formed between the top of the external hex screw 8 and the inner wall of the groove, allowing the external turning tool 12 to be inserted (the gap width should be slightly larger than the thickness of the tool holder of the external turning tool 12 to facilitate the smooth insertion of the tool). At this point, the tool holder of the external turning tool 12 should be inserted into the gap, ensuring that the cutting edge of the external turning tool 12 faces the machining station. Finally, use a wrench or other tools to tighten the end of the external hex screw 8. Since the external hex screw 8 is threadedly connected to the positioning hole on the inner wall of the groove of the outer clamping part 2, the rotational movement of the screw will be converted into linear movement along the thread direction. When the wrench is turned in the direction of tightening outward, the external hex screw 8 will move away from the clamping block 7 and closer to the external turning tool 12 along the thread trajectory. As the screw continues to be tightened, its top will gradually abut against the side of the tool holder of the external turning tool 12, while the clamping block 7, which has been fixed horizontally by the internal hex screw 9, will remain in contact with the external turning tool 12. The position cannot be shifted with the movement of the external hex screw 8, thus continuously reducing the gap between the top of the external hex screw 8 and the inner wall of the groove until the tool holder of the external turning tool 12 is tightly clamped between the two, thereby fixing the external turning tool 12. By adjusting the screw-in or screw-out range of the external hex screw 8, the installation requirements of external turning tools 12 of different specifications can be supported. With the lateral fixing limit of the external hex screw 8 by the clamping block 7, a compression fixing of the tool holder is formed, reducing the risk of workpiece scrap due to tool deviation.

[0039] The inner clamping part 3 is a hole-like structure opened on the side of the fixing base 4. It is locked by the tool bar 5 and the nut screw 6 to realize convenient installation and removal of the inner hole boring tool 11. The inner clamping part 3 is an inner clamping hole 401 on the side of the fixing base 4 for inserting the cylindrical flat tool bar 5. One end of the tool bar 5 has an insertion hole 501. The tool bar 11 can be directly inserted into the insertion hole 501 to form a modular combination, which makes it easy to replace the inner hole boring tool 11 of different specifications according to the processing requirements. The side of the tool bar 5 also has a side fixing hole 502. After the tool bar 5 is inserted into place (such as... Figure 1 (As shown) This hole is coaxial with the boring tool fixing hole 402 at the corresponding position on the side of the fixing seat 4.

[0040] In this embodiment, after the tool holder 5 and the internal boring tool 11 are inserted into the inner clamping hole 401, the grommet 6 is passed through the boring tool fixing hole 402 on the side of the fixing seat 4 until the end of the screw is screwed into the side fixing hole 502 of the tool holder 5. Through the thread locking force of the grommet 6, the tool holder 5 and the internal boring tool 11 can be firmly locked in the inner clamping hole 401, avoiding tool displacement caused by vibration during the machining process.

[0041] It should be noted that the outer wall dimensions of the tool holder 5 and the inner wall dimensions of the inner clamping hole 401 are precisely matched and designed. The fit clearance formed after the two are assembled is strictly controlled within the range of 0.02-0.05mm. This clearance can ensure that the tool holder 5 can be smoothly inserted into the inner clamping hole 401, avoiding assembly difficulties caused by interference fit, and can also minimize the radial wobble of the tool holder 5 in the hole, providing a stable support reference for the inner hole boring tool 11. At the same time, both the tool holder 5 and the clamping block 7 of the outer clamping part 2 are preferably made of stainless steel. This material not only has excellent rigidity and deformation resistance, and can withstand the cutting force transmitted by the tool during the machining process, but also has good wear resistance and corrosion resistance, which can reduce the problem of decreased clamping accuracy caused by rust or wear after long-term use and extend the overall service life of the tool holder.

[0042] In existing related technologies, such as Figure 1 As shown, traditional dual-station tool holders often adopt a "double inner hole" design, that is, two inner clamping holes 401 are opened on a tool holder fixing seat to install two inner hole boring tools 11. If the outer diameter of the workpiece needs to be machined, the workpiece needs to be removed from the machine tool fixture, flipped over and re-clamped, and the tool and tool holder adapted to the outer diameter machining need to be replaced. The process is cumbersome and time-consuming. However, this outer diameter combination tool holder 1, through the integrated design of the top outer clamping part 2 and the side inner clamping part 3, can install the outer diameter turning tool 12 and the inner hole boring tool 11 on a fixing seat 4 at the same time. During machining, there is no need to disassemble the workpiece or change the tool holder. The inner hole and outer diameter machining can be completed continuously by directly switching the tool through the machine tool program. This reduces one lathe process and one assembly and disassembly operation, shortening the overall lathe machining process by about 50%, greatly improving machining efficiency, avoiding the positioning error that may be caused by multiple clamping, and reducing the risk of workpiece scrap due to clamping deviation.

[0043] During machine tool processing, the cutting tool will generate high temperature due to high-speed cutting, which will lead to accelerated wear or reduced processing accuracy. In this embodiment, the combined tool holder 1 is provided with nozzles 10 on both sides of the fixed base 4, and together with the internal cooling water channel, a complete cooling circuit is formed to ensure that the cooling water is accurately sprayed to the tool processing position and improve the cooling effect.

[0044] Nozzles 10 are provided on both the left and right sides of the mounting base 4, with a total of four nozzles 10 on each side (top and bottom). The internal water channels of the nozzles 10 are directly connected to the cooling water channels inside the mounting base 4. The nozzles 10 are designed with an inclined angle (e.g., Figure 10 As shown), its spray direction can be precisely aimed at the cutting edge of the external turning tool 12 and the boring end of the internal boring tool 11, ensuring that the cooling water can directly act on the core area where the high temperature is generated, while avoiding the cooling water splashing to non-machined parts and affecting the surface quality of the workpiece. In addition, the nozzle 10 is fixed to the side of the fixing base 4 by a flat-head screw 1001 (as shown). Figure 1 (As shown), which facilitates later maintenance or replacement.

[0045] It should be noted that the mounting hole of the flat-head screw 1001 is located on one side of the mounting hole of the nozzle 10 on the side of the fixing base 4, and this mounting hole is in communication with the mounting hole of the nozzle 10 (e.g., Figure 1 As shown), nozzle 10 has a gourd-shaped structure that is thinner at the top and thicker at the bottom (as shown). Figure 10 As shown, when the nozzle 10 is inserted into the nozzle 10 mounting hole of the fixing base 4, and the flat-head screw 1001 is screwed in from the mounting hole, the screw head of the flat-head screw 1001 partially blocks the mounting hole of the nozzle 10, thereby reducing the hole diameter. This prevents the thicker end of the nozzle 10 from detaching from the mounting hole. After the nozzle 10 is inserted into the mounting hole and fixed by the flat-head screw 1001, its thicker end will tightly fit against the inner wall of the nozzle 10 mounting hole, precisely blocking the bottom opening of the mounting hole and forming a physical barrier. Since the cooling water channel inside the fixing base 4 only has an outlet port at the nozzle 10 mounting hole, the water flow of the cooling water channel can only be output outward through the nozzle 10 mounting hole. There is no need for high-precision coaxial docking between the internal channel of the nozzle 10 and the cooling water channel. When the cooling water flows into the nozzle 10 mounting hole from the cooling water channel, it will naturally fill the space in the mounting hole and then enter the internal channel of the nozzle 10. It will then be precisely guided to the tool processing area through the inclined spray nozzle of the nozzle 10, ensuring a stable and reliable cooling effect.

[0046] The cooling water channels are all located inside the fixed base 4, specifically including the upper cooling channel 16, the lower cooling channel 14, the first connecting pipe 15, and the second connecting pipe 17.

[0047] The lower cooling channel 14 is horizontally opened inside the fixed base 4 near the bottom, and its two ends are respectively connected to the internal channels of the nozzles 10 on both sides below the fixed base 4 (e.g., Figure 9 (As shown); the bottom of the fixed base 4 is also provided with a cooling water inlet 13, which is directly connected to the lower cooling channel 14. An external cooling water source (such as the machine tool's cooling water pump) can be connected to the cooling water inlet 13 through a water pipe to deliver cooling water to the lower cooling channel 14.

[0048] The upper cooling channel 16 is horizontally opened inside the fixed base 4 near the top (e.g., Figure 9As shown in the diagram, its two ends are respectively connected to the internal channels of the nozzles 10 above the two sides of the fixed base 4. The first connecting pipe 15 is vertically arranged inside the right side of the fixed base 4, with its bottom connected to the lower cooling channel 14 on the right side and its top connected to the upper cooling channel 16 on the right side. When the cooling water enters the lower cooling channel 14 on the right side through the bottom inlet, part of the cooling water will be diverted along the lower cooling channel 14 to the nozzles 10 below the two sides of the fixed base 4; the other part of the cooling water flows to the first connecting pipe 15 and is transported upward to the upper cooling channel 16 on the right side by water pressure.

[0049] The second connecting pipe 17 is horizontally positioned at the top inside the fixed base 4, with its two ends connected to the upper cooling channels 16 on the left and right sides respectively (e.g., Figure 9 As shown), the upper cooling channel 16 is formed by the left and right sides. When the cooling water enters the upper cooling channel 16 on the right side through the first connecting pipe 15, it will flow to the upper cooling channel 16 on the left side through the second connecting pipe 17, and finally be sprayed out from the nozzles 10 above the two sides of the fixed base 4.

[0050] In this embodiment, the bottom of the mounting base 4 has two cooling water inlets 13. The lower cooling channel 14 on the left receives water from the left cooling water inlet 13 and delivers it to the nozzle 10 on the lower left. The lower cooling channel 14 on the right delivers cooling water to the nozzle 10 on the lower right and the nozzles 10 on the upper left and right (e.g., ...). Figure 9 (As shown).

[0051] It should be noted that the cooling water channels are machined by directly drilling holes at preset positions on the upper and lower cooling channels 14, the first connecting pipe 15, and the second connecting pipe 17 using a CNC drilling machine to form a continuous water channel. Simultaneously, to avoid problems such as "multiple channels intersecting and causing turbulent water flow" or "exposed channel ports affecting sealing" during channel machining, redundant ports that do not require water flow (such as redundant ports penetrating the side wall of the fixed base 4 during drilling to simplify machining, or intersecting holes between channels that are not designed to be connected) are sealed using grommets 6. Figure 2 As shown in the figure, this ensures the sealing of the cooling water circuit and the stability of the water flow.

[0052] The output end of the external cooling water source (such as the machine tool's own cooling water pump) is equipped with a water pipe connector with external threads. The specifications of this connector match the internal thread of the cooling water inlet 13 at the bottom of the fixed base 4. When connecting, simply screw the water pipe connector into the threaded hole of the cooling water inlet 13 to achieve initial fixation. At the same time, to prevent cooling water from leaking at the gap between the connector and the inlet, an elastic sealing ring (such as a nitrile rubber sealing ring) can be installed between the mating surfaces of the water pipe connector and the cooling water inlet 13. The sealing ring will be compressed during the tightening of the connector, filling the tiny gap between the two and forming a reliable sealing structure.

[0053] Example 2: Please see Figures 10 to 12 This utility model provides a technical solution: The external cylindrical tool holder 1 described in Embodiment 1 can be installed on a CNC machine tool (such as...). Figure 10 As shown in the image, during installation, it needs to be used in conjunction with the machine tool's built-in disc-type tool turret (d) for positioning and fixation. In existing related technologies, for similar parts (approximately 80mm in diameter and 200mm in length, with complex and high-precision internal and external hole structures), face-machining is generally used when there are insufficient tool positions, resulting in unstable quality and low efficiency.

[0054] In this embodiment, the upper end face of the fixing seat 4 of the combined tool holder 1 is pre-drilled with a through tool holder fixing hole 403. This tool holder fixing hole 403 is coaxial with the pre-set mounting hole on the disc tool turret d. When installing the combined tool holder 1, first place the combined tool holder 1 at the designated position of the disc tool turret d, aligning the tool holder fixing hole 403 on the fixing seat 4 with the mounting hole of the disc tool turret d. Then, pass a long bolt from top to bottom through the mounting hole of the disc tool turret d and the tool holder fixing hole 403 on the fixing seat 4 until the end of the bolt is screwed into the threaded hole at the bottom of the disc tool turret d. By tightening the long bolt, the axial locking force of the bolt firmly fixes the combined tool holder 1 to the disc tool turret d, preventing displacement of the combined tool holder 1 due to vibration during machine tool operation.

[0055] In this embodiment, the machine tool is preferably a Tsugami lathe. The specific model can be flexibly selected according to the requirements of the workpiece being processed. The base a of the lathe is concave. The machine housing b is fixedly connected to the base a to protect the internal structure of the lathe and prevent splashing waste generated during the processing. The disc tool turret d of the lathe is fixed on the second guide rail o through the turret base i.

[0056] The disc tool turret d is connected to the second guide rail o via the turret base i. The slider of the turret base i is slidably connected to the slide rail of the second guide rail o, ensuring that the disc tool turret d can slide stably along the second guide rail o with the turret base i. To drive the movement of the turret base i, a transmission component (such as...) is specially configured on the back of the second guide rail o. Figure 13 As shown, the system includes a lead screw equipped with a pulley n and a third motor m, where the output end of the third motor m is connected to the pulley n via a transmission belt. When the third motor m starts, its output end drives the pulley n to rotate synchronously via the transmission belt. The pulley n and the lead screw of the second guide rail are coaxially fixed, and the rotation of the pulley n directly drives the lead screw to rotate. Since the bottom slider of the turret base i is engaged with the lead screw through a threaded structure, the rotational motion of the lead screw can be converted into the linear motion of the turret base i along the second guide rail o, thereby driving the disc tool turret d to move in the x-axis direction, satisfying the tool's machining position adjustment requirements in the lateral dimension.

[0057] To further extend the tool's range of motion, the bottom slider of the second guide rail o is connected to the first guide rail j. The first guide rail j is horizontally positioned and perpendicular to the second guide rail o, forming the lathe's longitudinal feed mechanism. A second motor h is mounted above the first guide rail j. The output end of the second motor h is connected to a lead screw above the first guide rail j via a coupling. A slider is fitted onto this lead screw, and this slider is bolted to the slider at the bottom of the second guide rail o, forming a linkage structure. When the second motor h starts, its output drives the lead screw above the first guide rail j to rotate. The rotation of the lead screw will cause the slider that cooperates with it to slide along the first guide rail j. The fixed connection between the slider and the second guide rail o will synchronously drive the second guide rail o and the turret base i and the disc tool turret d installed on it to move along the first guide rail j, thereby realizing the movement of the tool in the y-axis direction. At the same time, the disc tool turret d itself has a rotation drive function, which can drive the outer circle combination tool holder 1 and other tools installed on it to rotate synchronously according to the machining program, and complete the switching of different tools. The continuous switching of internal hole and external circle machining can be realized without manual intervention.

[0058] By installing an external cylindrical tool holder 1 on the lathe, the number of tools that can be mounted is increased. In existing related technologies, the tool turret of a Tsugami lathe can typically mount 12 tools. In traditional mounting schemes, some tool positions require tool holders for double internal boring tools 11 or dedicated tool holders for single internal boring tools 11. Such tool holders can only accommodate a single type of tool, resulting in low tool position utilization. However, by replacing some of the tool holders for double internal boring tools 11 or some dedicated tool holders for single internal boring tools 11 with the external cylindrical tool holder 1 of this embodiment, since a single external cylindrical tool holder 1 can simultaneously fix one external cylindrical turning tool 12 and one internal boring tool 11 (equivalent to mounting two tools with different functions in one tool position), without occupying additional tool position space, the actual number of tools mounted on the entire tool turret can be increased from 12 to 15 (replacing some single-tool positions with double-tool positions), significantly improving tool position utilization.

[0059] The increased number of tools makes the lathe more flexible in internal and external machining and process selection: For complex structural parts, external turning tools 12 (such as roughing tools and finishing tools) and internal boring tools 11 (such as roughing tools and finishing tools) adapted to different machining processes can be configured on the turret at the same time. There is no need to reduce process steps or frequently change tools due to insufficient tool positions. Internal and external machining processes can be completed in one operation. At the same time, when machining requirements change (such as switching to machining different specifications of parts), the tool combination can be quickly adjusted through the modular adaptation characteristics of the external turning tool holder 1, reducing process adjustment time.

[0060] More importantly, compared with the faceted machining mode in existing related technologies, this solution achieves the innovation of turning two sides into one side through the external cylindrical combination tool holder 1: Traditional faceted machining requires clamping one side of the workpiece to complete the inner hole (or outer circle) machining, disassembling and flipping it over, and then re-clamping it to machine the other side. This not only adds one assembly and disassembly process, but also easily leads to the coaxiality of the inner hole and outer circle of the part being out of tolerance and the dimensional accuracy being unstable due to the positioning deviation of the two clamping. However, after using the external cylindrical combination tool holder 1, the workpiece only needs to be clamped on the pneumatic three-jaw chuck c once. By switching the x-axis and y-axis movement and rotation of the tool turret, the external cylindrical turning tool 12 and the inner hole boring tool 11 on the same tool holder can be used to continuously complete the outer circle cutting and inner hole boring of the same side of the part, without flipping and secondary clamping. This improvement not only eliminates the time required for flipping and clamping, increasing processing efficiency by 30% to 50%, but also fundamentally avoids the accuracy errors caused by multiple clamping operations. It ensures that key quality indicators such as the coaxiality and dimensional consistency of the inner hole and outer circle of the part are more stable, and reduces the scrap rate of parts caused by clamping problems.

[0061] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.

[0062] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external circle gang tool holder characterized by, include: A combination tool holder (1) includes a fixed seat (4). The top of the fixed seat (4) is provided with a downwardly recessed outer clamping part (2) for fixing an external turning tool (12). The side of the fixed seat (4) is provided with an inner clamping part (3) for fixing an internal boring tool (11). Through the outer clamping part (2) and the inner clamping part (3), a combination tool holder (1) can simultaneously fix two different tools with different functions, an internal boring tool (11) and an external turning tool (12), which are used for internal hole machining and external diameter machining of workpieces, respectively. Nozzle (10): Nozzles (10) are provided on both sides of the fixed base (4). The internal water passage of the nozzle (10) is connected to the cooling water channel provided inside the fixed base (4). During the processing, the cooling water is transported to the nozzle (10) through the cooling water channel and sprayed onto the tool processing area by the nozzle (10).

2. An external circle tool holder (1) according to claim 1, characterized in that: The outer clamping part (2) includes a clamping block (7). A positioning hole is provided on the upper end face of the bottom of the groove of the outer clamping part (2). An internal hex screw (9) passes through the pre-set through hole above the clamping block (7) from top to bottom and is threadedly connected to the positioning hole at the bottom of the groove of the outer clamping part (2). An external hex screw (8) is provided on the side of the clamping block (7).

3. An external circle tool holder (1) according to claim 2, characterized in that: After the external hexagonal screw (8) passes horizontally through the pre-set mounting hole on the side of the clamping block (7), it is threadedly connected to the positioning hole opened on the side of the groove of the external clamping part (2). The external turning tool (12) is inserted into the gap between the top of the external hexagonal screw (8) and the inner wall of the groove of the external clamping part (2).

4. An external circle tool holder (1) according to claim 1, characterized in that: The inner clamping part (3) includes an inner clamping hole (401) on the side of the fixed base (4) for inserting the tool bar (5). One end of the tool bar (5) has an insertion hole (501) for connecting with the inner hole boring tool (11). The side of the tool bar (5) has a side fixing hole (502). The tool bar (5) is locked in the inner clamping hole (401) by passing through the boring tool fixing hole (402) on the side of the fixed base (4) and engaging with the side fixing hole (502) through the nut screw (6).

5. An external circle tool holder (1) according to claim 1, characterized in that: The cooling water channel includes an upper cooling channel (16) and a lower cooling channel (14). Both the upper cooling channel (16) and the lower cooling channel (14) are located inside the fixed base (4). The two ends of the upper cooling channel (16) are respectively connected to the internal channels of the nozzles (10) provided on the upper sides of the fixed base (4), and the two ends of the lower cooling channel (14) are respectively connected to the internal channels of the nozzles (10) provided on the lower sides of the fixed base (4).

6. An external circle tool holder (1) according to claim 5, characterized in that: The bottom of the fixed base (4) is provided with a cooling water inlet (13) that is connected to the lower cooling channel (14). External cooling water can enter the lower cooling channel (14) through the cooling water inlet (13) and then be diverted to the nozzles (10) on both sides of the fixed base (4).

7. An external circle tool holder (1) according to claim 6, characterized in that: The cooling water channel also includes a first connecting pipe (15) and a second connecting pipe (17). The bottom of the first connecting pipe (15) is connected to the lower cooling channel (14) on the right side of the fixed seat (4), and the top is connected to the upper cooling channel (16) on the right side of the fixed seat (4). After the external cooling water source enters the lower cooling channel (14) on the right side through the cooling water inlet (13) at the bottom of the fixed seat (4), a portion of the cooling water can be transported upward to the upper cooling channel (16) on the right side through the first connecting pipe (15).

8. An external circle tool holder (1) according to claim 7, characterized in that: The upper cooling channels (16) are connected by a second connecting pipe (17). After the external cooling water source enters the lower cooling channel (14) through the cooling water inlet (13), a portion of the cooling water enters the right upper cooling channel (16) through the first connecting pipe (15) and then flows to the left upper cooling channel (16) through the second connecting pipe (17).

Images