An engineering plastic positioning tool holder and anti-rotation tool shank system

Abstract

This utility model relates to an engineering plastic positioning tool holder and anti-rotation tool holder system. The engineering plastic positioning tool holder includes a fiber-reinforced engineering plastic body and a cylindrical clamping cavity disposed therein. The inner wall of the clamping cavity is provided with two axially symmetrical protruding keys about a central axis. The axially symmetrical protruding keys and the body are integrally molded into an inseparable structure by injection molding, and their outer surface contours complement and match the contours of standard tool holder keyways. This utility model's engineering plastic positioning tool holder and anti-rotation tool holder system innovatively integrates the advantages of zero-backlash positioning, low-cost manufacturing, long service life, and lightweight design through an integrated protruding key structure. It effectively eliminates the circumferential rotational freedom of the tool holder while reducing manufacturing costs, providing a better solution for precision machining.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, specifically an engineering plastic tool holder and system that achieves circumferential positioning of the tool holder through an integrally molded convex key. Background Technology

[0002] In the field of machining, traditional plastic tool holders mainly rely on friction to fix the tool holder, lacking an active mechanical positioning structure. This design has significant drawbacks in high-precision machining scenarios: when applied to position-sensitive precision equipment such as wireless probes, the microscopic circumferential displacement of the tool holder will directly lead to machining position deviations.

[0003] To improve positioning performance, there are also metal split-type positioning tool holders on the market, which achieve circumferential constraint through additional positioning keys. However, this type of solution has inherent drawbacks:

[0004] Structural redundancy and assembly dependence: The positioning keys need to be machined independently and fastened with screws, which significantly increases the assembly complexity and manufacturing cost;

[0005] Material limitations: Metal components increase system mass and pose a risk of electrochemical corrosion;

[0006] Accuracy attenuation mechanism: The interface between the parts inevitably produces a gap, which causes an error superposition effect under cyclic load, severely restricting the repeatability of positioning accuracy. Utility Model Content

[0007] In view of this, the present invention provides a lightweight, zero-gap integrated positioning tool holder that eliminates the circumferential rotational degree of freedom of the tool holder while reducing manufacturing costs.

[0008] The objective of this utility model is achieved through the following technical solution:

[0009] An engineering plastic positioning tool holder includes a fiber-reinforced engineering plastic body and a cylindrical clamping cavity disposed therein. The inner wall of the clamping cavity is provided with two axial protruding keys that are symmetrical about a central axis. The axial protruding keys and the body are integrally formed by injection molding into an inseparable structure, and the outer surface contour of the keys complements and matches the contour of a standard tool holder keyway.

[0010] The one-piece injection-molded, indivisible structure completely eliminates the assembly gaps of traditional split positioning keys, avoiding positioning deviations caused by loose screws or metal fatigue. The symmetrically distributed axial convex keys and the complementary matching design of the tool holder keyway can achieve bidirectional circumferential constraint without adding extra parts, solving the rotational displacement problem caused by pure friction fixation in traditional plastic tool holders. While maintaining the advantage of lightweight, the fiber-reinforced engineering plastic body shares the clamping load through the mechanical interlocking structure of the axial convex keys, significantly improving torsional stiffness. Furthermore, the single-piece molding characteristics of the injection molding process greatly reduce manufacturing costs and assembly time.

[0011] Preferably, the axial key is a continuous convex ridge extending axially along the clamping cavity, and its cross-section is a closed polygon or a complete arc.

[0012] The continuous, uninterrupted convex structure provides a uniform stress distribution path along the entire length, avoiding the risk of plastic creep or fracture caused by local stress concentration; the closed polygonal cross section enhances circumferential shear resistance through the corner locking mechanism, while the complete arc cross section guides the tool holder to be smoothly inserted and reduces contact wear through continuous curvature; both cross-sectional shapes maximize the contact area between the convex key and the tool holder keyway, utilize the self-lubricating properties of engineering plastics to reduce fretting wear at the metal-plastic interface, extend the tool holder's service life, and ensure high repeatability positioning accuracy.

[0013] Preferably, the axial length of the axial protrusion key is equal to the axial length of the clamping cavity.

[0014] The design of the key covering the entire length of the clamping cavity forms a continuous guide channel, which corrects axial deviation in real time during tool holder insertion and avoids jamming or uneven wear caused by insufficient local guidance. The equal length structure maximizes the welding strength between the root of the key and the body, and improves bending resistance by utilizing the fiber orientation effect of the plastic melt during injection molding. At the same time, the full-length fitting effectively disperses the vibration energy transmitted by the tool holder, and suppresses resonance through the damping characteristics of engineering plastics, thereby improving stability under high-speed machining conditions.

[0015] Preferably, the symmetrical planes of the two axial protruding keys coincide with the central axis plane of the clamping cavity.

[0016] The strictly 180° symmetrical layout of the convex keys ensures that the radial constraint force is centrally symmetrically distributed, eliminating tool holder eccentricity or tilting caused by asymmetrical clamping; the geometric relationship of the coincident central axis plane ensures that the clamping force vector of the double convex keys on the tool holder passes through the rotation center line, avoiding the generation of additional overturning moment; this symmetry, combined with the uniform shrinkage characteristics of engineering plastics, enables the injection molded parts to maintain consistent deformation after cooling, ensuring the dimensional stability and interchangeability of batch products.

[0017] Preferably, the inlet end of the axial key has an inclined surface for guiding the insertion of the tool holder, and the angle between the inclined surface and the axis of the clamping cavity is less than 90°.

[0018] The acute-angled inclined surface generates a radial force during the initial insertion stage of the tool holder, guiding the tool holder to automatically center and compensate for manufacturing tolerances; the progressive insertion design avoids hard collisions between the tool holder edges and the top of the key, preventing brittle fracture of the plastic; the line contact friction between the inclined surface and the tapered surface of the tool holder is converted into rolling friction, significantly reducing insertion resistance, while scraping away oil and impurities from the tool holder surface, maintaining a clean positioning interface; this structure also allows the use of higher rigidity engineering plastics without sacrificing assembly friendliness.

[0019] Preferably, the matrix material of the fiber-reinforced engineering plastic body is glass fiber reinforced polyamide or carbon fiber reinforced polyetheretherketone.

[0020] Glass fiber reinforced polyamide inhibits crack propagation through fiber bridging mechanisms, and its high toughness can absorb the impact of tool holder installation; carbon fiber reinforced polyetheretherketone utilizes the high modulus of carbon fiber to enhance the crush resistance of the convex bonds, and its high temperature resistance avoids positioning failure caused by thermal deformation; both types of materials use fiber orientation control technology to orient the fibers in the axial convex bond region along the stress direction to achieve local mechanical property enhancement; the corrosion resistance of the materials themselves also eliminates the need for the surface treatment process required for metal tool holders.

[0021] Preferably, the inner wall of the clamping cavity has no independent positioning elements except for the axial key, and the connection interface between the axial key and the body has no mechanical assembly marks.

[0022] The design without independent positioning elements eliminates potential failure points such as loose screws and missing pins, improving system reliability. The absence of mechanical assembly marks at the connection interface indicates that the key and the body are fused at the molecular level, with interface strength equivalent to the base material, avoiding fretting wear under cyclic loads in a split structure. The one-piece molding process creates a natural transition fillet at the root of the key, reducing the stress concentration factor by more than 60% compared to machined structures. This feature also simplifies the quality inspection process, requiring only visual or microscopic observation to verify process compliance.

[0023] Preferably, the body is stepped and includes a fixing part that is not on the same plane as the clamping cavity, and the fixing part is provided with a through hole.

[0024] The stepped structure achieves functional integration and optimized installation. The raised fixing part creates a natural chip removal space, preventing chip accumulation from affecting positioning accuracy. The arrangement of different planes mechanically decouples the clamping cavity from the mounting surface, blocking the direct transmission of machine tool vibration to the tool. This structure also facilitates the integration of sensor circuitry or coolant channels, reserving space for intelligent upgrades. The stepped drop naturally creates an anti-misinstallation feature, ensuring the unique positioning of the tool holder in the tool magazine and avoiding malfunctions in the automatic tool changer system.

[0025] An anti-rotation tool holder system includes a tool holder and an engineering plastic positioning tool clip as described above. The surface of the tool holder is provided with an axial groove that is complementary to the shape of an axial key. When the tool holder is inserted into the clamping cavity, the axial key and the axial groove form a circumferential rotation constraint engagement.

[0026] The complementary convex key-groove fit creates a geometric interlocking effect, achieving circumferential zero-clearance constraint without increasing clamping force. This fit transforms traditional surface contact into line contact, doubling the contact pressure per unit area and suppressing micro-slippage. The elastic deformation capability of engineering plastics allows for a wider groove tolerance zone, reducing tool holder manufacturing costs. The system achieves positioning through pure mechanical interlocking, eliminating the need for complex systems such as electronic sensors or hydraulic controls, resulting in a near-zero failure rate.

[0027] Preferably, the cross-sectional profile of the axial groove completely accommodates the cross-sectional profile of the axial key.

[0028] The fully accommodated fit ensures that the key and the groove sidewall are fully in contact, providing maximum torsional resistance using the normal force of the contact surface; this design avoids stress concentration caused by partial suspension of the key, preventing plastic creep; the accommodated fit also forms a closed grease cavity, enabling long-term maintenance-free operation; the automatic compensation characteristic of the fit clearance can adapt to dimensional fluctuations caused by temperature changes, ensuring positioning stability in high and low temperature environments.

[0029] The advantages of this utility model compared to the prior art are:

[0030] Zero-gap positioning and high precision: The symmetrical axial protrusion key, which is integrally injection molded, completely eliminates the gap in the split assembly, fundamentally solving the problem of circumferential rotational displacement of traditional plastic knife holders, and achieving high repeatability positioning accuracy.

[0031] Manufacturing costs are significantly optimized: the separate processing, heat treatment, surface treatment and assembly of metal positioning keys are eliminated, and the single-piece molding characteristics of injection molding process are utilized to greatly reduce raw material and manufacturing costs.

[0032] Extended service life: The excellent anti-fretting wear properties inherent in engineering plastics (such as glass fiber reinforced PA and carbon fiber reinforced PEEK), combined with the structural advantages of one-piece molding at the root of the convex key without stress concentration, significantly improve the wear resistance and fatigue life of the tool clip.

[0033] Lightweight and excellent dynamic performance: Engineering plastics have a density much lower than steel (usually 1 / 5 to 1 / 7 of steel), which effectively reduces the rotational inertia of the tool holder and the entire tool holder system, making them more suitable for high-speed and high-dynamic-response machining scenarios.

[0034] In summary, this utility model innovatively integrates the advantages of zero-gap positioning, low-cost manufacturing, long service life, and lightweight design through an integrated convex key structure, providing a better solution for precision machining. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a structural diagram of the engineering plastic positioning knife clip of Embodiment 1 of this utility model.

[0037] Figure 2 This is a structural diagram of the engineering plastic positioning knife clip from another perspective of Embodiment 1 of this utility model.

[0038] Labeling explanation: Body-1, Clamping cavity-2, Axial protrusion key-3, Guide slope-31, Fixing part-4, Through hole-41. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0041] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application 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 application.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0043] The technical solutions in this application will now be described with reference to the accompanying drawings. Example 1

[0044] This embodiment provides an engineering plastic positioning tool holder, including a fiber-reinforced engineering plastic body 1 and a cylindrical clamping cavity 2 disposed therein. The inner wall of the clamping cavity 2 is provided with two axial protrusions 3 that are symmetrical about the central axis. The axial protrusions 3 and the body 1 are integrally formed by injection molding into an inseparable structure, and the outer surface contour of the protrusions 3 is complementary and matched with the contour of the standard tool holder keyway.

[0045] The one-piece injection-molded, indivisible structure completely eliminates the assembly gaps of traditional split positioning keys, avoiding positioning deviations caused by loose screws or metal fatigue. The symmetrically distributed axial convex keys 3 and the keyway of the tool holder complement each other, achieving bidirectional circumferential constraint without adding extra parts, solving the rotational displacement problem caused by pure friction fixation in traditional plastic tool holders. While maintaining the advantage of lightweight, the fiber-reinforced engineering plastic body 1 shares the clamping load through the mechanical interlocking structure of the axial convex keys 3, significantly improving torsional stiffness. Furthermore, the single-piece molding characteristics of the injection molding process greatly reduce manufacturing costs and assembly time.

[0046] In this embodiment, the axial key 3 is a continuous convex ridge extending along the axial direction of the clamping cavity 2, and its cross-section is a closed polygon or a complete arc.

[0047] The continuous and uninterrupted convex structure provides a uniform stress distribution path along the entire length, avoiding the risk of plastic creep or fracture caused by local stress concentration; the closed polygonal cross section enhances circumferential shear resistance through the corner locking mechanism, while the complete arc cross section guides the tool holder to be smoothly inserted and reduces contact wear through continuous curvature; both cross-sectional shapes maximize the contact area between the convex key 3 and the tool holder keyway, utilize the self-lubricating properties of engineering plastics to reduce fretting wear at the metal-plastic interface, extend the tool holder's service life, and ensure high repeatability positioning accuracy.

[0048] In this embodiment, the axial length of the axial protrusion key 3 is equal to the axial length of the clamping cavity 2.

[0049] The design of the convex key 3 covering the clamping cavity 2 along its entire length forms a continuous guide channel, which corrects axial deviation in real time during tool holder insertion, avoiding jamming or uneven wear caused by insufficient local guidance; the equal length structure enables the connection area between the root of the convex key 3 and the body 1 to obtain the maximum welding strength, and improves the bending resistance by utilizing the fiber orientation effect of the plastic melt during injection molding; at the same time, the full-length fitting effectively disperses the vibration energy transmitted by the tool holder, and suppresses resonance through the damping characteristics of engineering plastics, thereby improving stability under high-speed machining conditions.

[0050] In this embodiment, the symmetrical planes of the two axial protrusions 3 coincide with the central axis plane of the clamping cavity 2.

[0051] The strictly 180° symmetrical layout of the convex key 3 ensures that the radial constraint force is centrally symmetrically distributed, eliminating tool holder eccentricity or tilting caused by asymmetrical clamping; the geometric relationship of the coincidence of the central axis plane ensures that the clamping force vector of the double convex key 3 on the tool holder passes through the rotation center line, avoiding the generation of additional overturning moment; this symmetry, combined with the uniform shrinkage characteristics of engineering plastics, enables the injection molded parts to maintain deformation consistency after cooling, ensuring the dimensional stability and interchangeability of batch products.

[0052] In this embodiment, the inlet end of the axial protruding key 3 has an inclined surface 31 for guiding the insertion of the tool holder, and the angle between the inclined surface 31 and the axis of the clamping cavity 2 is less than 90°.

[0053] The acute-angled inclined surface 31 generates a radial component force during the initial stage of tool holder insertion, guiding the tool holder to automatically center and compensate for manufacturing tolerances; the progressive insertion design avoids hard collisions between the tool holder edge and the top of the convex key 3, preventing brittle fracture of the plastic; the line contact friction between the inclined surface 31 and the tapered surface of the tool holder is converted into rolling friction, significantly reducing insertion resistance, while scraping away oil and impurities from the tool holder surface, maintaining a clean positioning interface; this structure also allows the use of higher rigidity engineering plastics without sacrificing assembly friendliness.

[0054] In this embodiment, the matrix material of the fiber-reinforced engineering plastic body 1 is glass fiber reinforced polyamide or carbon fiber reinforced polyetheretherketone.

[0055] Glass fiber reinforced polyamide inhibits crack propagation through fiber bridging mechanism, and its high toughness can absorb the impact of tool holder installation; carbon fiber reinforced polyetheretherketone utilizes the high modulus of carbon fiber to improve the crush resistance of the convex bond 3, and its high temperature resistance avoids positioning failure caused by thermal deformation; both types of materials use fiber orientation control technology to orient the fibers in the axial convex bond 3 region along the stress direction to achieve local mechanical property enhancement; the corrosion resistance of the materials themselves also eliminates the need for the surface treatment process required for metal tool holders.

[0056] In this embodiment, the inner wall of the clamping cavity 2 has no independent positioning elements except for the axial protruding key 3, and there are no mechanical assembly marks at the connection interface between the axial protruding key 3 and the body 1.

[0057] The design without independent positioning elements eliminates fault points such as loose screws and missing pins, improving system reliability; the absence of mechanical assembly marks at the connection interface indicates that the key 3 and the body 1 are fused at the molecular level, and the interface strength is equivalent to that of the base material, avoiding fretting wear of the split structure under cyclic loads; the one-piece molding process creates a natural transition fillet at the root of the key 3, reducing the stress concentration coefficient by more than 60% compared to machined structures; this feature also simplifies the quality inspection process, requiring only visual or microscopic observation to verify process compliance.

[0058] In this embodiment, the body 1 is stepped and includes a fixing part 4 that is not on the same plane as the clamping cavity 2. The fixing part 4 is provided with a through hole 41.

[0059] The stepped structure achieves functional integration and installation optimization. The raised fixing part 4 creates a natural chip removal space, preventing chip accumulation from affecting positioning accuracy. The arrangement of different planes mechanically decouples the clamping cavity 2 from the mounting surface, blocking the direct transmission of machine tool vibration to the tool. This structure also facilitates the integration of sensor circuitry or coolant channels, reserving space for intelligent upgrades. The stepped drop naturally creates an anti-misinstallation feature, ensuring the unique positioning of the tool holder in the tool magazine and avoiding malfunctions in the automatic tool changer system.

[0060] It should be particularly noted that the double-symmetric axial key structure and its specific features (such as continuous ridges, full-length coverage, inlet inclined surface, stepped body, etc.) shown in this embodiment are merely a specific and feasible implementation method to clearly illustrate the core concept of this utility model—that is, to achieve zero-clearance circumferential positioning of the tool holder through the integral injection molding of an indivisible axial key made of fiber-reinforced engineering plastic. The detailed description of this embodiment is intended to help understand the principles and technical advantages of this utility model, but does not constitute any limitation on the scope of protection of this utility model. Based on the inventive concept defined in the claims, those skilled in the art can make various changes, modifications, combinations, or optimizations to the specific number of keys (such as other symmetrical or asymmetrical arrangements besides double keys), shape (such as discontinuous ridges, other polygonal or arc-shaped cross sections), size ratio, inlet structure, body configuration (such as non-stepped integral structure), material selection (such as other types of fiber-reinforced engineering plastics), and manufacturing process details (such as different injection molding parameter controls) without departing from its spirit and scope. Therefore, any tool holder comprising a positioning structure consisting of an injection-molded engineering plastic body and an indivisible axial protrusion key on its inner wall, regardless of whether its specific implementation details are exactly the same as those described in this embodiment, as long as it utilizes the same inventive concept and achieves the same technical effects (such as eliminating assembly gaps, providing circumferential constraints, reducing manufacturing costs, etc.), falls within the scope of protection sought by this utility model. Example 2

[0061] This embodiment discloses a multi-level locking hexagonal convex key tool holder.

[0062] This embodiment continues the integrated structure of Embodiment 1, with the core innovation being the use of a precision-formed regular hexagonal closed cross-section for the axial key. This geometric configuration ensures the sharpness of the edges during injection molding through constant temperature control of the mold, and the six sets of mutually 120° planes form a natural anti-torsional step. When the tool holder is subjected to alternating torque, the edges of the key and the metal keyway engage progressively—initially, the outermost edge bears the main shear force; as the load increases, adjacent edges successively participate in load distribution, forming a multi-stage locking mechanism. The naturally formed 60° guiding angle at the apex of the hexagon replaces the independent inclined surface, generating a radial component force to achieve self-centering when the tool holder is inserted. Material flow analysis shows that the hexagonal symmetry structure causes the fiber orientation of the molten plastic in the key area to be radially distributed, significantly improving the peel strength of the corner areas. Compared to the traditional rectangular keyway fit, this design increases the torsional stiffness per unit contact area by approximately 1.8 times, while avoiding microcrack propagation caused by stress concentration at sharp corners.

[0063] It is particularly important to emphasize that the hexagonal convex key cross-section configuration and its unique multi-level locking mechanism shown in this embodiment are merely a preferred and specific implementation method for achieving the technical solution covered by the claims. It aims to more clearly illustrate the technical connotation and advantages of this utility model through specific examples, and is by no means a limitation on the scope of protection of this utility model. Those skilled in the art, based on the core concept of this utility model—that is, achieving zero-gap circumferential constraint through injection molding of an indivisible symmetrical axial convex key—can fully understand and implement other equivalent or varied solutions. For example, without departing from the scope defined by the claims, the specific cross-sectional shape of the convex key (such as other polygons, complete arcs, or combinations thereof), the precise number of convex keys (such as double or triple keys), the microscopic surface treatment of the convex keys, or the method of local material reinforcement, etc., can all be adaptively adjusted or optimized according to actual application requirements. Therefore, any implementation method that utilizes the same inventive concept and achieves the same or similar functions and effects, even if its specific structural details differ from those described in this embodiment, falls within the scope of protection sought by this utility model. Example 3

[0064] This embodiment discloses a three-key evenly distributed dynamic balance tool holder.

[0065] This embodiment, while maintaining the integral injection molding process, innovatively adopts a layout of three circumferentially distributed axial keycaps at 120°. This configuration exhibits unique advantages in thin-walled toolholder applications: the triangular mechanical structure formed by the three sets of keycaps uniformly decomposes radial pressure, eliminating the elliptic deformation of the toolholder that may be caused by the double-key system. The cross-section of the keycaps is designed as a continuous and complete arc, and its radius of curvature achieves nanometer-level contour matching with the groove of the standard toolholder. Under high-speed cutting conditions, the three-key system generates a dynamic balance effect—when the tool is subjected to asymmetrical cutting forces, each keycap automatically adjusts the contact pressure through the elastic deformation of the engineering plastic, suppressing chatter. The injection molding process uses a rotating core technology to ensure that the dimensional consistency error of the three sets of keycaps is less than 0.5 micrometers. It is particularly suitable for micro-tools with ultra-high aspect ratios, and its uniform support characteristics can control the tool runout within 1 / 3 of that of traditional structures. The keycaps axially penetrate the entire length of the clamping cavity, forming an airtight sliding effect during toolholder insertion and removal, effectively preventing external coolant from seeping into the positioning interface.

[0066] It should be clearly stated that the 120° circumferentially distributed layout of the three keys and their continuous and complete arc-shaped cross-section design adopted in this embodiment are an extended and preferred specific implementation of the basic scheme of "two axially symmetrical convex keys about the central axis" in the claims, used to demonstrate the advantages of the present invention in specific application scenarios (such as thin-walled tool holders and high-dynamic machining). The detailed description of this embodiment is for illustrative purposes only and does not imply a limitation or reduction of the scope of protection of the present invention. Those skilled in the art should understand that the scope covered by the claims is not limited to the specific number of convex keys (e.g., symmetrical double keys or other numbers of evenly / non-evenly distributed convex keys), the cross-sectional shape of the convex keys (such as polygonal or combined shapes other than a complete arc), the axial continuity of the convex keys (such as non-full-length convex keys), or specific dynamic balance mechanisms (such as different elastic deformation compensation methods), etc. Any technical solution based on the core idea of ​​this utility model—using an integrally injection-molded indivisible axial protrusion key to achieve circumferential mechanical constraint of the tool holder—even if its number of protrusion keys, distribution angle, cross-sectional shape, or dynamic response characteristics differ from those described in this embodiment, as long as it achieves the same or similar functions (such as providing circumferential positioning, suppressing rotational degrees of freedom, and reducing manufacturing costs) and achieves the expected effect, falls within the protection scope of this utility model. Example 4

[0067] This embodiment discloses a flange-type anti-vibration knife clamp.

[0068] This embodiment features a deeply optimized stepped body structure, extending the fixing part into a full-circumferential flange configuration. The flange plane is strictly perpendicular to the clamping cavity axis, and its diameter is calculated through topology optimization to achieve maximum bending stiffness while minimizing material usage. The flange mounting surface employs laser micro-texturing technology to form an interlaced mesh pattern. This micron-level groove structure produces a dual effect: mechanically, it increases the friction coefficient to resist loosening caused by machine tool vibration; fluidly, it forms a capillary effect to adsorb lubricating grease and establish a permanent lubricating film. The axial drop between the flange and the clamping cavity forms an annular chip collection groove, with an innovative vortex-type chip discharge channel at the bottom of the groove, automatically separating impurities of different densities using centrifugal force. In heavy-duty machining tests, this structure increased the system's resonant frequency to 2.2 times that of traditional straight-tube tool holders. The flange edge adopts a gradually thinning design, which not only meets the blind insertion positioning requirements of the tool magazine gripper but also avoids edge cracking caused by sudden stress changes. Cooling channels can be radially embedded along the flange to achieve efficient heat dissipation from cutting.

[0069] It is important to emphasize that the specific features described in this embodiment, such as the flange configuration, laser microtextured mounting surface, vortex-type chip removal channel, and embedded cooling channel, are a concretization and optimization of the structural feature described in the claims as "stepped, including a fixing part not on the same plane as the clamping cavity," used to demonstrate the implementation details under specific application requirements (such as vibration resistance, chip removal, and integrated cooling). The description of this embodiment aims to provide a feasible technical path, but in no way constitutes a limitation on the scope of protection of this utility model. Based on the core inventive concept defined in the claims—that is, providing zero-clearance positioning through the engineering plastic body and its integrally molded axial key—those skilled in the art can, without departing from its spirit, make extensive modifications, substitutions, or combinations of designs, such as the specific form of the fixing part (e.g., other bosses or bracket structures without flanges), the treatment of the mounting surface (e.g., a non-textured smooth surface or different textures), the chip removal structure (e.g., a non-vortex straight groove or other flow guiding design), the presence or layout of the cooling channel (e.g., external piping rather than embedded), and the specific shape of the flange edge (e.g., other chamfers or rounded corners that are not gradually thinning). Therefore, any positioning tool holder that includes the basic features described in the claims (such as fiber-reinforced engineering plastic body, integrally molded axial protrusion key, and stepped fixing part), regardless of whether the specific optimization details of its fixing part are the same as those in this embodiment, is within the protection scope of this utility model as long as it can achieve the same core functions (such as providing circumferential positioning, facilitating installation, improving chip removal, or shock resistance).

[0070] 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 engineering plastic positioning tool holder, comprising a fiber-reinforced engineering plastic body (1) and a cylindrical clamping cavity (2) provided inside the body, characterized in that, The inner wall of the clamping cavity (2) is provided with two axial protruding keys (3) that are symmetrical about the central axis. The axial protruding keys (3) and the body (1) are integrally formed by injection molding into an inseparable structure, and the outer surface contour of the key is complementary and matched with the contour of the standard tool holder keyway.

2. The engineered plastic toolholder according to claim 1, wherein, The axial key (3) is a continuous convex ridge extending along the axial direction of the clamping cavity (2), and its cross-section is a closed polygon or a complete arc.

3. The engineered plastic toolholder according to claim 1 or 2, wherein, The axial length of the axial key (3) is equal to the axial length of the clamping cavity (2).

4. The engineered plastic tool holder of claim 1, wherein, The planes of symmetry of the two axial protrusions (3) coincide with the central axis plane of the clamping cavity (2).

5. The engineered plastic toolholder of claim 1 wherein, The inlet end of the axial key (3) has an inclined surface (31) for guiding the insertion of the tool holder, and the angle between the inclined surface and the axis of the clamping cavity (2) is less than 90°.

6. The engineered plastic toolholder of claim 1 wherein, The matrix material of the fiber-reinforced engineering plastic body (1) is glass fiber reinforced polyamide or carbon fiber reinforced polyether ether ketone.

7. The engineered plastic toolholder according to claim 1, wherein, The inner wall of the clamping cavity (2) has no independent positioning elements except for the axial key (3), and there are no mechanical assembly marks at the connection interface between the axial key (3) and the body (1).

8. The engineered plastic toolholder according to claim 1, wherein, The body (1) is stepped and includes a fixing part (4) that is not on the same plane as the clamping cavity (2), and the fixing part (4) is provided with a through hole (41).

9. An anti-rotation tool holder system comprising a tool holder and an engineering plastic locating tool holder as claimed in any one of claims 1-8, characterized in that The surface of the tool holder is provided with an axial groove that is complementary to the shape of the axial protrusion key (3). When the tool holder is inserted into the clamping cavity (2), the axial protrusion key (3) and the axial groove form a circumferential rotational constraint fit.

10. The anti-rotation tool holder system of claim 9, wherein, The cross-sectional profile of the axial groove completely accommodates the cross-sectional profile of the axial key (3).

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