A lathe damping tool holder is disclosed, which comprises a tool holder body (1) and a damping tool holder (2).

Abstract

The application discloses a lathe damping tool bar holding tool seat, which is installed on a saddle of a lathe and comprises an adapter bottom plate, a tool seat base, a first tool seat cover plate and a second tool seat cover plate; the adapter bottom plate is connected with the saddle through a plurality of first fastening bolts; the tool seat base is connected with the adapter bottom plate through a plurality of second fastening bolts; the first tool seat cover plate and the second tool seat cover plate are connected with the tool seat base through a plurality of third fastening bolts respectively and jointly enclose a holding cavity for holding a damping tool bar. The lathe damping tool bar holding tool seat has high positioning precision, positioning pins are arranged between the adapter bottom plate and the saddle and between the tool seat base and the adapter bottom plate, and relative displacement of components can be limited; the lathe damping tool bar holding tool seat has strong adaptability, can be adapted to damping tool bars with different diameters by means of a split half-ring variable-diameter sleeve with multiple inner diameters and can avoid cutting force concentration because the total length of the cover plates is smaller than the length of the tool seat base; the half ring is provided with a cutting gap and can prevent extrusion or thermal expansion and cold contraction from causing damage.

Description

Technical Field

[0001] This application relates to the field of lathe fixture technology, and in particular to a vibration damping tool holder for lathes. Background Technology

[0002] Vibration damping tool holders are essential cutting tools for meeting the requirements of high-efficiency and high-quality machining of parts. The diameter of the tool holders ranges from D16 to D250, the length ranges from 142mm to 4000mm, and the weight is ≥1kg. The weight of larger and longer vibration damping tool holders can even reach 500kg, making them "juggernauts" among metal cutting tools. Because they need to machine deep cavities, the tool overhang is very long, requiring a reliable clamping method to ensure the clamping rigidity of the vibration damping tool holder in order to meet the machining efficiency and quality requirements of the parts.

[0003] In the field of lathe machining, the stable fixing of vibration damping tool holders is the key to ensuring machining accuracy and efficiency. However, existing clamping tool holders often have many technical problems and are difficult to meet actual production needs.

[0004] First, the problem of insufficient positioning accuracy is prominent. Most existing tool holders rely solely on bolt hole alignment to connect components, lacking an effective positioning structure. During installation, relative displacement between the adapter base plate and the saddle, and between the tool holder base and the adapter base plate, is prone to occur, resulting in a misalignment between the vibration damping tool holder axis and the machine tool spindle axis. This leads to dimensional deviations in the machined workpiece and increased surface roughness, especially in the machining of high-precision parts, where the problem is even more pronounced.

[0005] Secondly, poor adaptability limits the scope of application. Traditional tool holders have fixed clamping cavity dimensions, which can only be used with a single diameter vibration damping tool holder. Changing to a different diameter tool holder requires replacing the entire tool holder, increasing equipment procurement and inventory costs. Furthermore, some tool holders cannot be adapted to different machine tool saddles, resulting in low versatility and difficulty in meeting the frequent switching processing needs in multi-variety, small-batch production scenarios.

[0006] Furthermore, the structural stability and durability are poor. Some tool holder cover plates and bases have unreasonable length designs, which easily concentrate cutting forces at the connection edges, leading to loose bolts and deformation of the cover plates; tool holders without deformation buffer structures are prone to cracking and damage when subjected to compression or thermal expansion and contraction; at the same time, direct contact between the tool shank and the tool holder easily causes wear, shortening the service life of both.

[0007] Furthermore, inconvenient operation and maintenance reduce production efficiency. The existing tool holder disassembly and assembly process is complicated, especially for long and heavy vibration damping tool holders, which require multiple personnel to assemble and disassemble. When parts are damaged, they often need to be replaced as a whole, and the procurement of non-standard connecting parts is difficult, resulting in excessive downtime and maintenance time, which affects the production schedule. Utility Model Content

[0008] This application provides a vibration-damping tool holder for lathes, which solves the problems of low positioning accuracy, poor adaptability, and structural stability in existing tool holders. The technical solution is as follows:

[0009] A vibration-damping tool holder for lathes, mounted on the saddle of a machine tool, includes: an adapter base plate, a tool holder base, a first tool holder cover plate, and a second tool holder cover plate; the adapter base plate is connected to the saddle via multiple first fastening bolts; the tool holder base is connected to the adapter base plate via multiple second fastening bolts; the first tool holder cover plate and the second tool holder cover plate are respectively connected to the tool holder base via multiple third fastening bolts, together forming a clamping cavity for clamping the vibration-damping tool holder.

[0010] Optionally, the lathe vibration damping tool holder also includes a variable diameter sleeve movably disposed within the clamping cavity. The variable diameter sleeve has multiple inner diameter specifications to accommodate vibration damping tool holders of different diameters.

[0011] Optionally, the variable diameter sleeve includes two semi-rings that can be assembled into a hollow cylinder, wherein the inner diameter d of each semi-ring matches the diameter of the vibration damping blade rod, and the outer diameter D1 is slightly smaller than the diameter D of the clamping cavity.

[0012] Optionally, a cutting gap h is provided between the two semi-rings.

[0013] Optionally, the length of the first tool holder cover plate along the machine tool spindle direction and the length of the second tool holder cover plate along the machine tool spindle direction are equal and both are s. The sum of their total lengths is less than the length of the tool holder base along the machine tool spindle direction, which is L. The relationship between s and L is: 2s < L.

[0014] Optionally, a first positioning pin hole is provided between the adapter base plate and the saddle, and the first positioning pin is used for positioning; a second positioning pin hole is provided between the tool holder base and the adapter base plate, and the second positioning pin is used for positioning.

[0015] Optionally, the first fastening bolt is a cup-head screw, the second fastening bolt is a hexagonal head bolt, and the third fastening bolt is a cup-head screw.

[0016] Optionally, the center height H of the clamping tool holder is consistent with the center height of the machine tool spindle.

[0017] The beneficial effects of the technical solutions provided in this application include at least the following:

[0018] In summary, the vibration-damping tool holder and tool holder for lathes described in this application have the following beneficial effects:

[0019] 1. High positioning accuracy: Positioning pins are set between the adapter base plate and the saddle, and between the tool holder base and the adapter base plate, which can limit the relative displacement of the components. The center height of the clamping tool holder is consistent with the center height of the machine tool spindle, ensuring that the vibration damping tool holder axis is coaxial with the spindle, providing a stable reference for machining and reducing dimensional deviations.

[0020] 2. Strong adaptability: With the help of split semi-ring reducing sleeves with multiple inner diameter specifications, it can be adapted to vibration damping tool holders of different diameters without the need to change the tool holder; the adapter base plate can be adapted to different machine tool saddles, reducing the investment and inventory costs of special equipment.

[0021] 3. The structure is stable, and the total length of the cover plate is less than the length of the tool holder base to avoid the concentration of cutting force; the semi-circle is designed with a cutting gap to prevent damage caused by squeezing or thermal expansion and contraction, and can also absorb vibration; the bolt selection is adapted to the needs of each part to ensure connection strength and extend the service life of the components.

[0022] 4. Convenient operation and maintenance: positioning pins assist in quick alignment and installation; changing the tool holder only requires removing the cover plate and half ring; components are bolted together, and damaged parts can be replaced individually; standardized bolts are easy to procure, shortening downtime and maintenance time and improving production efficiency.

[0023] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0024] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional schematic diagram of a lathe vibration damping tool holder with a clamping tool holder and a vibration damping tool holder installed according to an embodiment of this application;

[0027] Figure 2 This is an exploded view of a lathe vibration damping tool holder with a vibration damping tool holder mounted on a tool holder according to an embodiment of this application;

[0028] Figure 3 This is a front view of the lathe vibration damping tool holder clamping tool holder provided in the embodiments of this application;

[0029] Figure 4This is a top view of the lathe vibration damping tool holder holding the tool holder provided in the embodiment of this application;

[0030] Figure 5 This is a left view of the lathe vibration damping tool holder clamping tool holder provided in the embodiments of this application;

[0031] Figure 6 This is a front view of the variable diameter sleeve in the tool holder for a lathe with vibration damping tool bar provided in this embodiment of the application.

[0032] Explanation of reference numerals in the attached figures

[0033] 1-Saddle; 2-Adapter base plate; 3-Tool holder base; 4-First tool holder cover plate; 5-Second tool holder cover plate; 6-Second fastening bolt; 7-Third fastening bolt; 8-Reducing diameter sleeve; 801-Half ring; 11-Vibration damping tool bar. Detailed Implementation

[0034] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0035] In this disclosure, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the relative positions of the corresponding components in the direction of gravity when they are in use, and "inner" and "outer" refer to their relative positions to the contours of the corresponding components themselves. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or importance implications. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements.

[0036] According to the embodiments of this application, refer to Figures 1 to 6 As shown, a lathe vibration-damping tool holder is mounted on the saddle 1 of the machine tool and includes: a transition base plate 2, a tool holder base 3, a first tool holder cover plate 4, and a second tool holder cover plate 5. The transition base plate 2 is connected to the saddle 1 by multiple first fastening bolts. The tool holder base 3 is connected to the transition base plate 2 by multiple second fastening bolts 6. The first tool holder cover plate 4 and the second tool holder cover plate 5 are respectively connected to the tool holder base 3 by multiple third fastening bolts 7, together forming a clamping cavity for clamping the vibration-damping tool holder 11.

[0037] In the above embodiment, when installing the vibration damping tool bar 11, the connection preparation between the saddle 1 and the adapter base plate 2 is first performed. Before installation, the mounting surface of the saddle 1 must be thoroughly cleaned to remove dust, chips, oil, and other impurities, to prevent these impurities from causing gaps between the adapter base plate 2 and the saddle 1, which would affect the stability and positioning accuracy of the subsequent connection. Then, the adapter base plate 2 is placed stably in the preset mounting position of the saddle 1, and its position is adjusted so that the bolt holes on the adapter base plate 2 are precisely aligned with the corresponding threaded holes on the saddle 1. After alignment, multiple first fastening bolts are removed and sequentially passed through the bolt holes of the adapter base plate 2 and aligned with the threaded holes of the saddle 1. At this point, a wrench is used to gradually tighten the first fastening bolts in a symmetrical sequence. The purpose of using a symmetrical tightening method is to prevent the adapter base plate 2 from shifting or deforming due to uneven force during the tightening process, to ensure that the adapter base plate 2 and the saddle 1 fit tightly together, to minimize the gap between the two, and to provide a stable and flat reference surface for the subsequent installation of the tool holder base 3.

[0038] After completing the connection between the adapter base plate 2 and the saddle 1, the installation phase of the tool holder base 3 and the adapter base plate 2 begins. The tool holder base 3 is placed in the preset position on the adapter base plate 2, and its posture is adjusted so that the bolt holes on the tool holder base 3 are fully aligned with the threaded holes on the adapter base plate 2. Next, several second fastening bolts 6 are removed, passed through the bolt holes of the tool holder base 3, and aligned with the threaded holes of the adapter base plate 2. Since the tool holder base 3 will subsequently bear the cutting force and vibration impact transmitted by the vibration-damping tool holder 11, a wrench is used to tighten the second fastening bolts 6. This ensures a secure connection between the tool holder base 3 and the adapter base plate 2, effectively resisting various external forces generated during subsequent machining and preventing displacement or loosening of the tool holder base 3.

[0039] After the tool holder base 3 is securely installed, preparations for clamping the vibration-damping tool bar 11 begin. First, place the vibration-damping tool bar 11 to be used in the pre-defined support area on the tool holder base 3, and adjust its position so that its axis is parallel to the machine tool spindle axis, laying the foundation for subsequent precision machining. Then, take the first tool holder cover plate 4 and the second tool holder cover plate 5 respectively, and cover one side of the vibration-damping tool bar 11, ensuring there are no obvious gaps between the two cover plates and the tool holder base 3. Next, take out multiple third fastening bolts 7, and pass them sequentially through the bolt holes on the first tool holder cover plate 4 and the second tool holder cover plate 5, aligning them with the threaded holes on the tool holder base 3. Tighten the third fastening bolts 7 with a wrench to ensure that the clamping force applied by the two cover plates to the vibration-damping tool bar 11 is evenly distributed. If the local clamping force is too large, it may cause indentations or deformation on the surface of the vibration damping tool holder 11; if the clamping force is insufficient, the vibration damping tool holder 11 may loosen or shift during processing. As the third fastening bolt 7 is gradually tightened, the first tool holder cover plate 4, the second tool holder cover plate 5, and the tool holder base 3 together form a closed clamping cavity, and the vibration damping tool holder 11 is firmly fixed in the clamping cavity. This completes the installation of the clamping tool holder and the fixing process of the vibration damping tool holder 11, and it can proceed to subsequent lathe processing operations.

[0040] During lathe machining, the cutting force and vibration borne by the vibration-damping tool holder 11 are transmitted through the clamping cavity to the first tool holder cover plate 4, the second tool holder cover plate 5, and then to the tool holder base 3, and subsequently to the saddle 1 via the adapter base plate 2. Since each connection point is securely connected by multiple fastening bolts, and a tight fit is ensured during connection, these external forces and vibrations can be effectively dispersed, preventing damage to local components due to concentrated force, and reducing the impact of vibration on machining accuracy. When it is necessary to replace the vibration-damping tool holder 11 or maintain the tool holder, simply loosen the third fastening bolt 7, the second fastening bolt 6, and the first fastening bolt in the reverse order of installation to remove the first tool holder cover plate 4, the second tool holder cover plate 5, the tool holder base 3, and the adapter base plate 2 respectively. This convenient operation greatly reduces the time and cost of maintenance and replacement.

[0041] This technical solution, through its modular structural design and scientific connection method, demonstrates several advantages in practical applications, as detailed below:

[0042] From the perspective of connection stability, the layered use of multiple fastening bolts ensures the strength of each connection point. The multiple first fastening bolts between the adapter base plate 2 and the saddle 1 can evenly transfer the load borne by the adapter base plate 2 to the saddle 1, preventing individual bolts from breaking or loosening due to excessive force. The multiple second fastening bolts 6 between the tool holder base 3 and the adapter base plate 2 further enhance the load transfer effect, making the tool holder base 3 less prone to displacement when subjected to cutting forces and vibrations. The multiple third fastening bolts 7 between the first tool holder cover plate 4, the second tool holder cover plate 5 and the tool holder base 3 ensure the reliability of the clamping cavity's clamping of the vibration damping tool holder 11. Even during high-speed cutting or machining of workpieces with high hardness, the vibration damping tool holder 11 can remain stable without loosening or shifting, effectively ensuring the continuity and stability of the machining process.

[0043] In terms of ease of disassembly, assembly, and maintenance, the bolted connection method adopted in this solution has significant advantages. When it is necessary to replace the vibration damping tool bar 11 of different specifications, there is no need to modify the tool holder structure; simply loosen the third fastening bolt 7 to remove the cover plate and replace the vibration damping tool bar 11. If a component of the tool holder is damaged, only the damaged component needs to be replaced, without replacing the entire tool holder, greatly reducing maintenance costs. At the same time, the bolted connection is simple and easy to understand to operate; operators do not need to master complex techniques to complete the disassembly and assembly, reducing reliance on professional skills and improving maintenance efficiency.

[0044] From the perspective of versatility and adaptability, the adapter base plate 2 plays a crucial transitional role. Different models of machine tool saddles 1 may differ in terms of mounting hole positions and size specifications. However, by replacing or adjusting the design of the adapter base plate 2, components such as the tool holder base 3 and cover plate of the same specification can be adapted to different types of saddles 1. This eliminates the need to design a complete set of tool holders for each machine tool, reducing equipment manufacturing costs. It also facilitates the upgrading and transformation of existing equipment by enterprises, and improves the applicability of the tool holders.

[0045] Regarding ensuring machining accuracy, the precise positioning and tight fit of each component throughout the installation process ensured a high degree of coaxiality between the axis of the vibration-damping tool holder 11 and the machine tool spindle axis. The stable fixation of the vibration-damping tool holder 11 reduced vibration during machining, preventing tool deviation caused by vibration and thus improving the dimensional accuracy and surface quality of the machined workpiece. For example, when machining cylindrical workpieces, it effectively reduced the roundness error and surface roughness of the workpiece's outer diameter, improving product quality and reducing the scrap rate.

[0046] According to the embodiments of this application, refer to Figure 6As shown, different lathe machining tasks require the use of vibration damping tool holders 11 with different diameters. Therefore, the specific diameter of the vibration damping tool holder 11 to be used must be determined before installation. The lathe vibration damping tool holder clamping tool holder also includes a variable diameter sleeve 8 movably disposed in the clamping cavity. The variable diameter sleeve 8 has multiple inner diameter specifications to accommodate vibration damping tool holders 11 with different diameters. Based on the determined diameter of the vibration damping tool holder 11, a variable diameter sleeve 8 with an inner diameter that perfectly matches the diameter of the vibration damping tool holder 11 is selected from multiple variable diameter sleeves 8 with different inner diameter specifications. During the selection process, measuring tools such as calipers are used to verify the inner diameter of the variable diameter sleeve 8 to ensure that the inner hole of the variable diameter sleeve 8 can tightly fit the outer surface of the vibration damping tool holder 11. At the same time, the outer diameter of the variable diameter sleeve 8 must match the diameter of the clamping cavity to ensure that the variable diameter sleeve 8 can be stably positioned after being placed in the clamping cavity without significant shaking.

[0047] After selecting a suitable reducing sleeve 8, place it movably into the clamping cavity of the tool holder base 3. When placing it, pay attention to the orientation of the reducing sleeve 8, ensuring that its axis is aligned with the axis of the clamping cavity. If the reducing sleeve 8 is a split structure, it must be assembled first before being placed into the clamping cavity as a whole; if it is a one-piece structure, it can be placed directly and smoothly. After the reducing sleeve 8 is in place, gently rotate or push it to check if it moves freely within the clamping cavity without any jamming. Simultaneously, confirm that there is no significant gap between the outer surface of the reducing sleeve 8 and the inner wall of the clamping cavity. If the gap is too large, recheck the specifications of the reducing sleeve 8 to ensure it is correct, or check for impurities affecting the fit. If necessary, replace it with a reducing sleeve 8 of the appropriate specifications.

[0048] Next, install the vibration damping tool holder 11. Slowly insert the vibration damping tool holder 11 into the inner hole of the reducing sleeve 8. During insertion, ensure that the axis of the vibration damping tool holder 11 coincides with the axis of the reducing sleeve 8 to avoid collisions or friction between the vibration damping tool holder 11 and the inner wall of the reducing sleeve 8, preventing scratches or damage to both surfaces, which would affect the subsequent clamping effect and the service life of the vibration damping tool holder 11. After the vibration damping tool holder 11 is fully inserted into the reducing sleeve 8, adjust its position so that its end faces the machine tool spindle and its length is parallel to the machine tool spindle axis, ensuring that the tool can accurately align with the workpiece machining position during subsequent processing.

[0049] After placing the vibration damping tool rod 11, cover both sides of the reducing sleeve 8 with two cover plates, ensuring the inner surface of the cover plates fits tightly against the outer surface of the reducing sleeve 8. Then, pass multiple third fastening bolts 7 through the bolt holes of the cover plates and align them with the threaded holes of the tool holder base 3. Tighten the third fastening bolts 7 using an Allen wrench, applying the tightening torque evenly according to the principle of symmetry and gradual tightening. As the bolts are tightened, the first tool holder cover plate 4 and the second tool holder cover plate 5 exert uniform compressive force on the reducing sleeve 8. Under the action of the compressive force, the reducing sleeve 8 further conforms to the outer surface of the vibration damping tool rod 11, while the outer surface of the reducing sleeve 8 also fits tightly against the inner wall of the clamping cavity. Finally, through the transitional action of the reducing sleeve 8, the vibration damping tool rod 11 is securely fixed in the clamping cavity.

[0050] When it is necessary to replace the vibration damping tool holder 11 with one of different diameters, simply loosen the third fastening bolt 7, remove the first tool holder cover plate 4 and the second tool holder cover plate 5, remove the original reducing sleeve 8 from the clamping cavity, and then select the corresponding reducing sleeve 8 according to the diameter of the new vibration damping tool holder 11. Complete the installation of the reducing sleeve 8 and the new vibration damping tool holder 11 by following the same steps as above, and then tighten the cover plate again. The entire replacement process does not require any modification or disassembly of the main structure of the tool holder (adapter base plate 2, tool holder base 3), making the operation simple and quick, and able to adapt to different processing needs quickly.

[0051] During lathe machining, the cutting force and vibration borne by the damping tool holder 11 are transmitted to the tool holder base 3 and cover plate through the reducing sleeve 8, and then to the saddle 1 via the adapter base plate 2. Because the reducing sleeve 8 is tightly fitted to the damping tool holder 11 and the inner wall of the clamping cavity, it effectively disperses the cutting force and vibration energy, preventing damage to local components due to excessive force, and reducing the impact of vibration on the damping tool holder 11, ensuring the stability of the machining process. The reducing sleeve 8 also acts as a buffer, reducing the direct pressure of the cover plate and tool holder base 3 on the damping tool holder 11, preventing indentations or deformation on the surface of the damping tool holder 11, and protecting the structural integrity of the damping tool holder 11. This technical solution, by adding a reducing sleeve 8 with multiple inner diameter specifications, further improves the practicality and adaptability of the tool holder, and brings several advantages, as follows:

[0052] First, it significantly improves the versatility of the tool holder and effectively reduces equipment costs. In traditional tool holder designs, if different diameter damping tool rods 11 are required, it is usually necessary to replace the entire tool holder or modify the clamping cavity of the tool holder. This not only requires the purchase of multiple sets of tool holders, increasing equipment investment costs, but also consumes a lot of time and manpower due to the modification of the tool holder, affecting production efficiency. However, the variable diameter sleeve 8 in this solution has multiple inner diameter specifications. By simply selecting the corresponding variable diameter sleeve 8 according to the diameter of the damping tool rod 11, the same tool holder can be used to fix damping tool rods 11 of different diameters without replacing the main tool holder components.

[0053] Secondly, the replacement process of the vibration-damping tool holder 11 is simplified, improving production efficiency. Furthermore, the variable diameter sleeve 8 effectively protects the vibration-damping tool holder 11 and the main body of the tool holder, extending their service life. During the clamping process of the vibration-damping tool holder 11, the variable diameter sleeve 8, as an intermediate transition component, directly contacts the clamping cavity wall of the vibration-damping tool holder 11 and the tool holder, avoiding direct friction and compression between the vibration-damping tool holder 11 and the tool holder base 3 and cover plate. When the tool holder is subjected to vibration or cutting force, the variable diameter sleeve 8 can buffer part of the impact force, reducing wear and indentations on the surface of the vibration-damping tool holder 11, while also protecting the inner wall of the clamping cavity of the tool holder from scratches by minor protrusions or impurities of the vibration-damping tool holder 11.

[0054] According to the embodiments of this application, refer to Figure 6 As shown, the reducing sleeve 8 includes two semi-rings 801 that can be assembled into a hollow cylinder. The inner diameter d of each semi-ring 801 matches the diameter of the vibration damping tool rod 11, and the outer diameter D1 is slightly smaller than the diameter D of the clamping cavity. This technical solution significantly improves the convenience of installing and disassembling the vibration damping tool rod 11, especially suitable for long and heavy vibration damping tool rods 11. In the traditional integral reducing sleeve 8 design, the vibration damping tool rod 11 needs to be inserted from one end of the reducing sleeve 8 when installing it. For vibration damping tool rods 11 that are longer than 1 meter or weigh more than 5 kg, the insertion process requires the cooperation of multiple operators, which is not only labor-intensive but also prone to collision between the vibration damping tool rod 11 and the reducing sleeve 8 due to improper operation, damaging the surface of the parts. In this solution, the semi-rings 801 are a split structure. One semi-ring 801 can be placed on the tool holder base 3 first, then the vibration damping tool rod 11 can be placed directly on the semi-ring 801, and finally the other semi-ring 801 can be covered, eliminating the need for insertion.

[0055] According to the embodiments of this application, refer to Figure 6 As shown, a cutting gap h is provided between the two semi-rings 801.

[0056] First, the cutting gap h provides the necessary deformation space for the semi-ring 801, effectively preventing structural damage during the clamping process and ensuring uniform distribution of clamping force. In a semi-ring 801 design without a cutting gap, when the cover plate applies compressive force, the semi-ring 801 cannot expand outward, leading to localized stress concentration. This can cause cracks on the inner surface of the semi-ring 801 or rigid friction between the outer surface and the inner wall of the clamping cavity. Long-term use will cause wear or deformation of the semi-ring 801, affecting clamping stability. In this design, the cutting gap h allows the semi-ring 801 to expand outward (reducing the gap width) when compressed, enabling it to fit tightly against the inner wall of the clamping cavity and the outer surface of the vibration damping rod 11 through uniform deformation, thus avoiding stress concentration.

[0057] Secondly, the cutting gap h enhances the tool holder's ability to buffer vibrations, reducing the impact of machining vibrations on accuracy. During lathe machining, especially under high-speed or intermittent cutting conditions, the vibration-damping tool holder 11 generates high-frequency vibrations. If these vibrations cannot be effectively buffered, they can lead to increased workpiece surface roughness and out-of-tolerance dimensional accuracy. The semi-ring 801 with the cutting gap h can absorb some of the vibration energy through the slight deformation of the gap: when vibration is transmitted to the semi-ring 801, the two semi-rings 801 can generate a slight relative displacement along the gap direction, converting the vibration energy into the elastic deformation energy of the semi-ring 801, reducing the transmission of vibration to the tool holder base 3 and the saddle 1.

[0058] Furthermore, the cutting gap h solves the problem of thermal expansion and contraction of the semi-ring 801, ensuring the stable performance of the tool holder under different temperature conditions. During high-speed cutting, cutting heat is transferred to the semi-ring 801 through the vibration damping tool holder 11, causing the temperature of the semi-ring 801 to rise (usually reaching 50-80℃). If the semi-ring 801 has no expansion space, it will form an interference fit with the inner wall of the clamping cavity, resulting in deformation of the semi-ring 801 or excessive clamping force, or even jamming of the vibration damping tool holder 11, which cannot rotate. In low-temperature environments (such as workshop temperatures below 10℃ in winter), the contraction of the semi-ring 801 may lead to insufficient clamping force, causing the vibration damping tool holder 11 to loosen. The cutting gap h provides a buffer space for the thermal expansion and contraction of the semi-ring 801: at high temperatures, the expansion of the semi-ring 801 reduces the gap width, avoiding rigid compression with the clamping cavity; at low temperatures, the contraction of the semi-ring 801 increases the gap width, and sufficient clamping force can still be maintained through the pre-tightening force of the cover plate.

[0059] Furthermore, the cutting gap h simplifies the machining and assembly process of the semi-ring 801, reducing production costs. During the machining of the semi-ring 801, the gap h is formed through a cutting process, eliminating the need for high-precision grinding of the splicing surfaces. This reduces the machining accuracy requirements of the semi-ring 801 splicing surfaces, decreasing the time and cost of the grinding process. During assembly, the gap h allows for minor machining errors in the semi-ring 801 splicing surfaces, enabling precise splicing without repeated adjustments to the semi-ring 801 position, thus improving assembly efficiency.

[0060] Finally, the design of the cutting gap h also enhances the adaptability of the tool holder to vibration-damping tool rods 11 of different diameters. For vibration-damping tool rods 11 of the same specification with slight diameter deviations (e.g., ±0.02mm), the gapless half-ring 801 may result in insufficient or excessive clamping force due to size mismatch, while the half-ring 801 with gap h can adapt to these deviations through slight changes in the gap: when the diameter of the vibration-damping tool rod 11 is slightly larger, the half-ring 801 is compressed, reducing the gap; when the diameter is slightly smaller, the half-ring 801 slightly contracts, increasing the gap, while still maintaining a stable clamping force.

[0061] According to the embodiments of this application, refer to Figure 3 and Figure 4As shown, the length of the first tool holder cover plate 4 along the machine tool spindle direction and the length of the second tool holder cover plate 5 along the machine tool spindle direction are equal and both are s. The sum of their total lengths is less than the length of the tool holder base 3 along the machine tool spindle direction, which is L. The relationship between s and L is: 2s < L.

[0062] This technical solution further optimizes the stress structure, installation adaptability, and functional expandability of the tool holder by precisely controlling the length relationship between the first tool holder cover plate 4, the second tool holder cover plate 5, and the tool holder base 3. It also optimizes the stress distribution of the tool holder, improves the overall structural strength and stability, and effectively extends the service life of the components. In traditional tool holder designs, if the length of the cover plate is equal to the length of the tool holder base 3 (2s=L), the connecting bolts between the cover plate and the tool holder base 3 will be distributed at both ends of the tool holder base 3. When the vibration-damping tool shank 11 bears a large cutting force, the bolts are prone to generating a large torque due to excessive lever arm, leading to bolt loosening or wear of the threaded holes.

[0063] According to the embodiments of this application, refer to Figure 2 As shown, a first locating pin hole is provided between the adapter base plate 2 and the saddle 1, and the first locating pin is used for positioning; a second locating pin hole is provided between the tool holder base 3 and the adapter base plate 2, and the second locating pin is used for positioning. The setting of the locating pins greatly improves the positioning accuracy of the connection between the components, avoids the deviation that is easy to occur due to bolt connections relying solely on hole alignment, ensures the coaxiality of the vibration damping tool holder 11 axis and the machine tool spindle axis, and guarantees machining accuracy. At the same time, it simplifies the installation and reassembly process, saves adjustment time, and improves efficiency. It can also share the lateral load borne by the bolts, reduce the risk of bolt loosening, enhance the overall structural stability and service life of the tool holder, and is especially suitable for high-frequency disassembly and maintenance scenarios.

[0064] According to an embodiment of this application, the first fastening bolt is a cup-head screw, the second fastening bolt 6 is a hexagonal head bolt, and the third fastening bolt 7 is a cup-head screw.

[0065] Cup-head screws are used to connect the base plate 2 and the cover plate. The recessed head design avoids structural interference and ensures a flat mounting surface. Hex head bolts are used for the tool holder base 3, providing greater preload and enhancing the connection strength of key components. Furthermore, the standardized bolt types facilitate procurement and replacement, reducing maintenance costs while improving the overall assembly rationality and reliability of the tool holder, adapting to the stress and operational requirements of lathe machining.

[0066] According to the embodiments of this application, refer to Figure 1As shown, the center height H of the clamping tool holder is consistent with the center height of the machine tool spindle. This consistency ensures that the vibration-damping tool holder 11 is coaxial with the machine tool spindle, preventing tool cutting position deviation due to height discrepancies. This significantly improves the dimensional accuracy and surface quality of the machined workpiece and reduces the scrap rate. Simultaneously, it eliminates the additional radial force caused by inconsistent center heights, reducing wear on the tool holder, tool, and machine tool components, extending their service life. It also ensures uniform cutting force transmission, reduces machining vibration, and improves the stability and efficiency of lathe machining, making it particularly suitable for high-precision parts machining scenarios.

[0067] In summary, the vibration-damping tool holder and tool holder for lathes of this application have the following beneficial effects:

[0068] 1. High positioning accuracy: Positioning pins are set between the adapter base plate and the saddle, and between the tool holder base and the adapter base plate, which can limit the relative displacement of the components. The center height of the clamping tool holder is consistent with the center height of the machine tool spindle, ensuring that the vibration damping tool holder axis is coaxial with the spindle, providing a stable reference for machining and reducing dimensional deviations.

[0069] 2. Strong adaptability: With the help of split semi-ring reducing sleeves with multiple inner diameter specifications, it can be adapted to vibration damping tool holders of different diameters without the need to change the tool holder; the adapter base plate can be adapted to different machine tool saddles, reducing the investment and inventory costs of special equipment.

[0070] 3. The structure is stable, and the total length of the cover plate is less than the length of the tool holder base to avoid the concentration of cutting force; the semi-circle is designed with a cutting gap to prevent damage caused by squeezing or thermal expansion and contraction, and can also absorb vibration; the bolt selection is adapted to the needs of each part to ensure connection strength and extend the service life of the components.

[0071] 4. Convenient operation and maintenance: positioning pins assist in quick alignment and installation; changing the tool holder only requires removing the cover plate and half ring; components are bolted together, and damaged parts can be replaced individually; standardized bolts are easy to procure, shortening downtime and maintenance time and improving production efficiency.

[0072] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0073] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0074] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A vibration-damping arbor-holding tool holder for a lathe, which is mounted on a saddle (1) of the lathe, characterized in that, include: Adapter base plate (2), tool holder base (3), first tool holder cover plate (4), and second tool holder cover plate (5); The adapter base plate (2) is connected to the saddle (1) by a plurality of first fastening bolts; The tool holder base (3) is connected to the adapter base plate (2) by a plurality of second fastening bolts (6); The first tool holder cover plate (4) and the second tool holder cover plate (5) are respectively connected to the tool holder base (3) by multiple third fastening bolts (7), forming a clamping cavity for clamping the vibration damping tool rod (11).

2. The vibration-damping lathe bar clamping tool holder according to claim 1, characterized in that, The lathe vibration damping tool holder also includes a variable diameter sleeve (8) movably disposed in the clamping cavity. The variable diameter sleeve (8) has multiple inner diameter specifications to accommodate vibration damping tool holders (11) of different diameters.

3. The vibration-damping lathe tool holder with a clamping tool holder according to claim 2, characterized in that, The variable diameter sleeve (8) includes two semi-rings (801) that can be assembled into a hollow cylinder. The inner diameter d of each semi-ring (801) matches the diameter of the vibration damping knife rod (11), and the outer diameter D1 is slightly smaller than the diameter D of the clamping cavity.

4. The vibration-damping lathe tool holder according to claim 3, characterized in that, A cutting gap h is provided between the two semi-rings (801).

5. The vibration-damping lathe tool bar clamping tool holder according to claim 1, characterized in that, The length of the first tool holder cover plate (4) along the machine tool spindle direction and the length of the second tool holder cover plate (5) along the machine tool spindle direction are equal and both are s. The sum of their total lengths is less than the length of the tool holder base (3) along the machine tool spindle direction, which is L. The relationship between s and L is: 2s < L.

6. The lathe vibration damping tool holder and clamping tool holder according to claim 1, characterized in that, The adapter base plate (2) and the saddle (1) are provided with a first positioning pin hole and are positioned by the first positioning pin; The tool holder base (3) is provided with a second positioning pin hole between it and the adapter base plate (2), and is positioned by the second positioning pin.

7. The vibration-damping lathe tool bar clamping tool post according to claim 1, wherein, The first fastening bolt is a cup head screw, the second fastening bolt (6) is a hexagonal head screw, and the third fastening bolt (7) is a cup head screw.

8. The vibration-damping lathe tool bar clamping tool post according to claim 1, wherein, The center height H of the clamping tool holder is consistent with the center height of the machine tool spindle.

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