A locally metal-reinforced epoxy-based carbon fiber composite tool head and a method of making the same

Abstract

The application provides a local metal reinforced epoxy-based carbon fiber composite tool head and a preparation method thereof, and relates to the technical field of work tools.The tool head body provided by the application is made of an epoxy-based carbon fiber composite material, and only a working surface is provided with a metal insert, so that light weight and work performance are considered;the self weight of the composite material is light, the metal insert makes up for the local wear resistance and shear resistance defects of the composite material, the metal insert is fixed by being pre-embedded and formed in combination with at least one secondary reinforcing structure, the interface failure problem of a single connection mode is solved, the bonding is firm under high load, and there is no delamination and debonding risk;the preparation method provided by the application integrates the whole process of simulation layering, hot pressing curing, precision machining and interface strengthening, the forming process is optimized in a directional manner according to the stress characteristics of the hydraulic tool head, the interface between the metal and the composite material is combined stably, the consistency of the finished product is high, and the batch industrial manufacturing requirements are met.

Description

Technical Field

[0001] This application relates to the field of working tool technology, and more specifically, to a locally metal-reinforced epoxy carbon fiber composite tool head and its preparation method. Background Technology

[0002] The core load-bearing component of hydraulic pliers, hydraulic shears, wire cutters, and cable crimping pliers is the tool head. Its jaws, shearing blades, and crimping surfaces endure high contact compressive stress, shear stress, and high-frequency impact loads over extended periods. Currently, commercially available tool heads are generally made from high-carbon steel, chromium-vanadium alloy steel, or solid carbide through integral casting or forging. To meet the requirements for wear resistance, impact resistance, and high strength, the metal blank must retain a large wall thickness and overall volume, directly resulting in a heavy tool head. In scenarios such as power emergency repairs, high-altitude cable work, firefighting demolition, and construction, operators need to hold, lift, and reciprocate the tools for extended periods. Heavy metal tool heads significantly increase the load on arm muscles, easily leading to operator fatigue. This not only reduces continuous work efficiency but also weakens the gripping, shearing, and crimping accuracy due to hand tremors, posing safety hazards such as falls from heights and operational errors.

[0003] Existing technologies have proposed solutions for lightweighting tool components using carbon fiber composite materials, but all of them have significant technical drawbacks and cannot adapt to the complex three-dimensional stress and localized ultra-high stress conditions of hydraulic tool heads.

[0004] Existing composite material tool patents (PCT patent WO2017025945A1) simply use composite materials to wrap the entire metal tool head, resulting in a high proportion of metal parts and limited improvement in weight reduction. Furthermore, the composite material and the overall metal head are only bonded by the coating interface, which is prone to delamination and debonding failure under high cyclic loads, failing to meet the high-frequency pressure requirements of hydraulic tools.

[0005] Chinese patent CN110843285B discloses a metal-carbon fiber multilayer laminated plate structure that relies on a low-melting-point alloy for interlayer bonding, but it is only suitable for planar thin plate components. This solution uses planar mesh carbon fiber cloth, which cannot be used to orient the fibers for the three-dimensional curved surface and multi-directional stress field of hydraulic tool heads. The collaborative load-bearing mode of each plate layer is difficult to adapt to the local concentrated loads of the jaws and cutting edges, and is prone to local crushing and interlayer cracking.

[0006] Patent CN202111348501.5 discloses a vacuum-introduced molding process for pre-embedded metal carbon fiber shells, which is only applicable to low-stress shell components and does not perform specific stress-bearing layer optimization for tool head cutting edges and clamping surfaces. At the same time, the vacuum-introduced process has poor controllability of resin content and low fiber volume fraction, resulting in insufficient overall stiffness and shear resistance of the components, making it unable to withstand the instantaneous pressing and shearing loads of several tons to more than ten tons from hydraulic tools.

[0007] Epoxy carbon fiber composites possess advantages such as ultra-high specific strength, high specific modulus, fatigue resistance, corrosion resistance, and a density far lower than steel, making them an ideal substrate for lightweight tools. However, the inherent shortcomings of this material limit its direct use on tool working surfaces: the carbon fiber matrix has weak resistance to local point pressure and cutting edge shearing, and direct contact with the workpiece can easily lead to surface crushing and fiber delamination; at the same time, the bonding strength between the composite material and the metal connection structure of the hydraulic piston rod is insufficient, and the connection is prone to loosening under long-term cyclic loads.

[0008] Existing technologies have not yet formed an integrated solution for the differentiated stress characteristics of tool heads, and cannot simultaneously take into account lightweight, local wear and impact resistance, and reliability of the metal-composite interface.

[0009] In view of this, this application aims to provide a locally metal-reinforced epoxy carbon fiber composite tool head and its preparation method, so as to better solve the above-mentioned technical problems. Summary of the Invention

[0010] The purpose of this application is to provide a locally metal-reinforced epoxy carbon fiber composite tool head and its preparation method. The tool head uses composite material as the main body and sets local metal inserts only on the working contact surface. While ensuring the mechanical properties of the key working area, it achieves a significant weight reduction effect. Through a specific interface reinforcement structure and preparation process, a reliable connection between the composite material body and the metal inserts is ensured.

[0011] This application provides a locally metal-reinforced epoxy-based carbon fiber composite tool head, comprising:

[0012] The composite material body is formed by stress-oriented lay-up of epoxy carbon fiber composite material and high temperature and high pressure curing, which constitutes the overall load-bearing structure of the tool head. The composite material body accounts for more than 80% of the total volume of the tool head. The composite material body is divided into a functional area that cooperates with the workpiece and a connection area that connects with the hydraulic power source.

[0013] A partial metal inlay is embedded within the working contact surface of the functional area, with its outer surface exposed and in direct contact with the workpiece. The volume of the partial metal inlay does not exceed 20% of the overall volume of the tool head. The surface of the partial metal inlay undergoes sandblasting roughening, acid etching, ultrasonic cleaning, and plasma activation treatment, and is coated with a silane coupling agent or epoxy primer. The composite material body and the periphery of the partial metal inlay are formed by continuous carbon fiber layup to create a ring-shaped three-dimensional stress transfer structure. The partial metal inlay is first pre-embedded to achieve a basic bond, and then further reinforced using at least one of the following methods: structural adhesive bonding, mechanical riveting, or interference fit.

[0014] A coating layer is disposed on at least a portion of the outer surface of the composite material body, and the coating layer is any of the following: a rubber vulcanization layer, a thermoplastic elastomer injection molding layer, and an anti-corrosion protective coating.

[0015] Furthermore, the aforementioned annular three-dimensional enveloping stress transfer structure employs continuous carbon fibers laid in multiple layers around the local metal inlay, with the fibers covering the sides and bottom of the inlay, and the fiber arrangement direction matching the principal stress direction around the inlay.

[0016] Furthermore, the epoxy-based carbon fiber composite material comprises an epoxy resin matrix and a carbon fiber reinforcement; the carbon fiber reinforcement is any of the following: continuous unidirectional carbon fiber, chopped carbon fiber, carbon fiber fabric, and three-dimensional braided carbon fiber preform; the layup is optimized according to the principal stress trajectory line of the finite element simulation of the tool head working condition, so that the carbon fiber orientation is consistent with the principal stress direction of the component.

[0017] Furthermore, the material of the partial metal inlay is any of the following: tool steel, high-speed steel, cemented carbide, and 4340 alloy steel.

[0018] Furthermore, when the tool head is a hydraulic pliers tool head, the functional area is the jaw clamping part, and the partial metal inlay is only provided on the clamping contact surface to form wear-resistant clamping teeth.

[0019] Furthermore, when the tool head is a hydraulic shear tool head, the functional area is the shearing blade area, and the local metal inlay is a continuous or discontinuous thin sheet inlay, which is only arranged at the cutting edge line.

[0020] Furthermore, when the tool head is a hydraulic crimping tool head, the functional area is the cable crimping part, and the local metal inlay is fully covered in the contact area to form a wear-resistant and pressure-bearing contact surface.

[0021] Furthermore, the connection area of ​​the composite material body is provided with a metal connector, which is a metal insert embedded inside the composite material body or a metal sleeve covering the outer wall of the connection area. The metal connector is used to detachably connect to the hydraulic cylinder piston rod through a threaded or flanged structure.

[0022] Based on the same inventive concept, this application also provides a method for preparing the above-mentioned locally metal-reinforced epoxy carbon fiber composite tool head, comprising the following steps:

[0023] Step 1: Use finite element software to simulate the stress and strain distribution of the tool head under rated working conditions, extract the principal stress trajectory lines, determine the carbon fiber layup angle and layup thickness distribution, and simultaneously delineate the pre-embedded positions and geometric dimensions of local metal inserts.

[0024] Step 2: Select carbon fiber prepreg based on simulation results, and lay it in layers in the mold using automatic tape laying or manual laying process. Lay a continuous unidirectional carbon fiber layer in the main stress area.

[0025] Step 3: The surface of the local metal inlay is successively subjected to sandblasting roughening, acid pickling etching, ultrasonic cleaning, and plasma activation treatment. The surface is coated with silane coupling agent or epoxy primer and fixed to the preset embedded position of the mold using a special positioning fixture.

[0026] Step 4: Place the mold with the completed layup into an autoclave or molding machine to cure the epoxy resin matrix, so as to achieve an integrated interface between the metal insert and the composite material body.

[0027] Step 5: The cured blank is milled, drilled, and finished to meet the design dimensions and geometric tolerance standards;

[0028] Step 6: For the high-stress interface area where the edge of the metal inlay fits into the composite material body as determined by finite element simulation, mechanical riveting or high-pressure injection of structural adhesive is performed inside the machined groove to complete the secondary composite fixation of the metal inlay and the composite material body.

[0029] Step 7: Perform plasma or corona surface activation on the entire finished component;

[0030] Step 8: A coating layer is formed on the outer surface of the main body of the composite material through injection molding, rubber vulcanization, and spraying processes to obtain the finished tool head.

[0031] Furthermore,

[0032] In step four, the epoxy resin matrix is ​​cured by maintaining the temperature at 120~180℃ and 0.4~1.0MPa for 2~4 hours.

[0033] In step five, the cured blank is milled, drilled, and finished using a five-axis CNC machining center with diamond-coated tools to meet the design dimensions and geometric tolerance standards.

[0034] The beneficial effects of this invention are:

[0035] 1. The tool head provided by this invention is mainly composed of epoxy-based carbon fiber composite material, with local metal inlays only configured on the working contact surface. The volume of the metal inlays does not exceed 20% of the total volume of the tool head. Epoxy-based carbon fiber composite material has a much lower density than steel, which can significantly reduce the weight of the tool head, resulting in a significant overall weight reduction under the same stiffness conditions. The composite material itself has excellent fatigue resistance and corrosion resistance. Combined with an outer coating layer, it can be adapted to the high-frequency cyclic load conditions of hydraulic tools. Its long-term fatigue life is superior to that of all-metal structures, making it suitable for long-term handheld operation scenarios such as power emergency repair and fire demolition. The lightweight structure optimizes the overall balance performance of the machine, effectively reducing the labor load of the operator. At the same time, high-hardness metal inlays are set on high-stress working surfaces such as the jaws, shearing blades, and cable crimping surfaces to compensate for the shortcomings of carbon fiber composite material in local compressive strength, wear resistance, and shear resistance, ensuring the stability and service life of the tool during clamping, shearing, and crimping operations. The metal insert uses pre-embedded molding as the basic bonding structure, and is further reinforced by at least one of the following methods: structural adhesive bonding, mechanical riveting, and interference fit. The composite connection structure avoids the defects of easy debonding and cracking of single fixing methods, and greatly improves the reliability of the interface bonding between the metal insert and the composite matrix under heavy load conditions.

[0036] 2. The tool head preparation method provided by the present invention integrates simulation lay-up, hot pressing curing, precision machining and interface strengthening. It optimizes the molding process in a targeted manner for the stress characteristics of hydraulic tool heads, resulting in stable interface bonding between metal and composite materials, high consistency of finished products, and meeting the requirements of mass industrial manufacturing. Attached Figure Description

[0037] 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.

[0038] Figure 1 This is a schematic diagram of the tool head structure in some embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram of the tool head structure in some embodiments of the present invention;

[0040] Figure 3 This is a schematic diagram of the tool head structure in some embodiments of the present invention;

[0041] Figure 4 This is a schematic diagram of the internal structure of the tool head in some embodiments of the present invention.

[0042] The reference numerals in the attached figures are as follows:

[0043] 1. Composite material body, 2. Partial metal inlay, 3. Covering layer, 4. Metal connector. Detailed Implementation

[0044] To facilitate understanding of the present invention, it will be described more fully below through embodiments, and preferred embodiments are given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Any other implementation schemes obtained by modifying or equivalently substituting the technical solutions of the present invention without inventive step are all within the protection scope of the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0046] The numerical values ​​disclosed in the embodiments of this invention are approximate values, not definitive values. Where error or experimental conditions permit, all values ​​within the error range may be included, and the specific numerical values ​​disclosed in the embodiments of this invention are not limited to those specified.

[0047] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0048] Example 1

[0049] See Figure 1 As shown, this embodiment provides a locally metal-reinforced epoxy-based carbon fiber composite tool head, specifically a locally metal-reinforced carbon fiber composite hydraulic tool head, with the following specific structure:

[0050] The composite material body 1 is made of T700 unidirectional carbon fiber prepreg, with bisphenol A type epoxy resin as the matrix and a fiber volume fraction of 62%. During layup, the fibers are arranged along the main force direction of the jaw length. A unidirectional fiber layer is added below the pivot hole and jaw clamping surface. An additional fiber layer is superimposed in the pivot area to resist torsional shear. After high temperature and high pressure curing, it forms the overall load-bearing structure of the tool head. The composite material body 1 accounts for 85.9% of the total volume of the tool head. The composite material body 1 is divided into a functional area that mates with the workpiece and a connection area that connects with the hydraulic power source.

[0051] A partial metal inlay 2 is embedded in the working contact surface of the functional area, with its outer surface exposed and in direct contact with the workpiece. The volume of the partial metal inlay 2 accounts for 14.1% of the overall volume of the tool head. Specifically, the partial metal inlay 2 is made of Cr12MoV tool steel, CNC milled, and has a hexagonal split clamping tooth structure with anti-slip crimping teeth machined on the inner surface. The inlay is embedded in the jaw functional area of ​​the composite material body 1, with its outer surface completely exposed as the working contact surface. Multiple annular anti-slip grooves are opened on the side wall of the inlay for resin impregnation and wrapping. The metal inlay and the composite material body 1 are fixed by a double combination of pre-embedded molding and secondary bonding with epoxy structural adhesive. The embedded surface of the metal part is successively treated by sandblasting roughening, plasma activation, and silane coupling agent primer coating. A carbon fiber layer forms a continuous annular wrapping layer around the metal part, constructing a three-dimensional stress transmission channel.

[0052] Metal connector 4, made of 4340 alloy steel pre-embedded bushing, is located in the tool head connection area, with standard M24 internal thread machined inside for threaded connection with hydraulic piston rod; the outer wall of the bushing is knurled and roughened, and is pre-embedded in the root of composite material.

[0053] The covering layer 3 is a TPU thermoplastic elastomer covering layer 3 molded on the back and outer hand-held area of ​​the tool head and injection molded onto the outer surface of the composite material.

[0054] The preparation steps are as follows:

[0055] Step 1: Use finite element software to simulate the stress field of the clamp head under the rated pressure of the tool head, extract the principal stress trajectory line, determine the carbon fiber layup angle and layup thickness distribution, and simultaneously delineate the pre-embedded position and geometric dimensions of the local metal inlay 2.

[0056] Step 2: Select the single-layer thickness of T700 epoxy carbon fiber prepreg based on the simulation results, and lay it in layers in the mold using automatic tape laying or manual laying process. Lay a continuous unidirectional carbon fiber layer in the main stress area.

[0057] Step 3: The surface of the partial metal inlay 2 is successively subjected to sandblasting roughening, acid etching, ultrasonic cleaning, and plasma activation treatment. The surface is coated with silane coupling agent or epoxy primer and fixed to the preset embedded position of the mold using a special positioning fixture.

[0058] Step 4: Place the mold with the completed layup into an autoclave or molding machine to cure the epoxy resin matrix and achieve an integrated interface between the metal insert and the composite material body 1.

[0059] Step 5: The hardened blank is milled, drilled, and finished using a five-axis CNC machining center with diamond-coated tools to meet the design dimensions and geometric tolerance standards.

[0060] Step 6: For the high-stress interface area where the edge of the metal inlay fits against the composite material body 1 as obtained from finite element simulation, mechanical riveting or high-pressure injection of structural adhesive is performed inside the machined groove to complete the secondary composite fixation of the metal inlay and the composite material body 1.

[0061] Step 7: Perform plasma or corona surface activation on the entire finished component;

[0062] Step 8: Form a coating layer 3 on the outer surface of the main body 1 of the composite material through injection molding, rubber vulcanization and spraying processes to obtain the finished tool head.

[0063] Example 2

[0064] See Figure 2 As shown, this embodiment provides a locally metal-reinforced epoxy-based carbon fiber composite tool head, specifically a locally metal-reinforced epoxy-based carbon fiber composite hydraulic shear tool head, with the following specific structure:

[0065] The composite material body 1 is made of M40J high-modulus epoxy carbon fiber prepreg with a fiber volume fraction of 60%. During the layup, the blade support area is continuously laid up unidirectionally along the shear force direction, and the shear bifurcation pivot area is densely laid up. After that, it is cured and molded under high temperature and high pressure to form the overall load-bearing structure of the tool head. The composite material body 1 accounts for 88.1% of the total volume of the tool head. The composite material body 1 is divided into a functional area that cooperates with the workpiece and a connection area that connects with the hydraulic power source.

[0066] A partial metal inlay 2 is embedded in the working contact surface of the functional area, with its outer surface exposed and in direct contact with the workpiece. The volume of the partial metal inlay 2 accounts for 1.9% of the overall volume of the tool head. Specifically, the material of the partial metal inlay 2 is a YG8 cemented carbide sheet inlay, which is only arranged in a local area of ​​the cutting edge to form a continuous shearing edge. The back side of the inlay is machined with a sawtooth engagement groove and is completely wrapped with carbon fiber. The metal inlay and the composite material body 1 are double-locked by pre-embedded integral molding and mechanical riveting with countersunk rivets on the side. The embedded surface of the metal part is successively treated by sandblasting roughening, plasma activation, and silane coupling agent primer. The carbon fiber layer forms a continuous annular wrapping layer around the metal part, constructing a three-dimensional stress transmission channel.

[0067] Metal connector 4, made of 4140 alloy steel with pre-embedded shaft bushing, is located in the scissor hinge hole to resist high-frequency shearing impact;

[0068] Covering layer 3 is located on the back of the tool head and the outer hand-held area, and is sprayed with a two-component polyurethane wear-resistant protective coating.

[0069] The preparation steps are the same as in Example 1.

[0070] Example 3

[0071] See Figures 3-4 As shown, this embodiment provides a locally metal-reinforced epoxy-based carbon fiber composite tool head, specifically a locally metal-reinforced epoxy-based carbon fiber composite hydraulic crimping tool head, with the following specific structure:

[0072] The composite material body 1 is made of T800 carbon fiber three-dimensional braided preform composite epoxy resin, which is pressed into the overall three-dimensional braided structure below the working surface. The thickness direction is continuous fiber to resist interlayer crushing. The remaining areas are covered with unidirectional prepreg layers, and then cured and molded under high temperature and high pressure to form the overall load-bearing structure of the tool head. The composite material body 1 accounts for 80.3% of the total volume of the tool head. The composite material body 1 is divided into a functional area that cooperates with the workpiece and a connection area that connects with the hydraulic power source.

[0073] A partial metal inlay 2 is embedded in the working contact surface of the functional area, with its outer surface exposed and in direct contact with the workpiece. The volume of the partial metal inlay 2 accounts for 19.7% of the overall volume of the tool head. Specifically, the partial metal inlay 2 is made of 4340 tempered steel, with a split hexagonal pressing working surface, and is completely embedded in the pressing functional area. A strip-shaped metal support inlay is added at the bottom to disperse high-pressure stress. The metal inlay and the composite material body 1 are fixed by a double composite method of pre-embedded integral molding and epoxy structural adhesive injection. The embedded surface of the metal part is successively treated by sandblasting roughening, plasma activation, and silane coupling agent primer. A carbon fiber layer forms a continuous annular wrapping layer around the metal part, constructing a three-dimensional stress transmission channel.

[0074] Metal connector 4, made of 4140 alloy steel, is embedded in the shaft bushing and located in the scissor hinge hole to resist high-frequency shearing impact. The connection area is equipped with a metal embedded seat for connecting the hydraulic cylinder, with an inner wall threaded connection.

[0075] Covering layer 3 is located on the back of the tool head and the outer hand-holding area, and is an injection-molded TPU elastic covering layer 3.

[0076] The preparation steps are the same as in Example 1.

[0077] The tool heads prepared in Examples 1-3 above were subjected to high-frequency reciprocating shearing. The composite material body 1 showed no cracking or delamination, and the cemented carbide cutting edge showed no chipping or curling.

[0078] In summary, the tool head body provided by this invention is made of epoxy-based carbon fiber composite material, with metal inserts accounting for ≤20% of the volume only on the working surface, balancing lightweight design and operational performance. The composite material is lightweight, fatigue-resistant, and corrosion-resistant, effectively reducing the load on the handheld device and improving the overall balance of the machine. The metal inserts compensate for the local wear resistance and shear resistance defects of the composite material, ensuring the durability of high-stress areas such as the jaws, cutting edges, and crimping surfaces. The metal inserts are fixed by pre-embedded molding combined with at least one secondary reinforcement structure, solving the problem of easy interface failure with single connection methods, ensuring strong adhesion under high loads and eliminating the risk of delamination.

[0079] The preparation method provided by this invention integrates the entire process of simulation layup, hot pressing curing, precision machining and interface strengthening. It optimizes the molding process in a targeted manner for the stress characteristics of hydraulic tool heads, resulting in stable interfacial bonding between metal and composite materials, high consistency of finished products, and meeting the requirements of mass industrial manufacturing.

[0080] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tool head made of locally metal-reinforced epoxy-based carbon fiber composite material, characterized in that, include: The composite material body is formed by stress-oriented lay-up of epoxy carbon fiber composite material and high temperature and high pressure curing, which constitutes the overall load-bearing structure of the tool head. The composite material body accounts for more than 80% of the total volume of the tool head. The composite material body is divided into a functional area that cooperates with the workpiece and a connection area that connects with the hydraulic power source. A partial metal inlay is embedded within the working contact surface of the functional area, with its outer surface exposed and in direct contact with the workpiece. The volume of the partial metal inlay does not exceed 20% of the overall volume of the tool head. The surface of the partial metal inlay undergoes sandblasting roughening, acid etching, ultrasonic cleaning, and plasma activation treatment, and is coated with a silane coupling agent or epoxy primer. The composite material body and the periphery of the partial metal inlay are formed by continuous carbon fiber layup to create a ring-shaped three-dimensional stress transfer structure. The partial metal inlay is first pre-embedded to achieve a basic bond, and then further reinforced using at least one of the following methods: structural adhesive bonding, mechanical riveting, or interference fit. A coating layer is disposed on at least a portion of the outer surface of the composite material body, wherein the coating layer is any of the following: a rubber vulcanized layer, a thermoplastic elastomer injection molding layer, and an anti-corrosion protective coating.

2. The tool head made of locally metal-reinforced epoxy-based carbon fiber composite material according to claim 1, characterized in that, The aforementioned annular three-dimensional enveloping stress transfer structure employs continuous carbon fibers laid in multiple layers around a local metal inlay, with the fibers covering the sides and bottom of the inlay, and the fiber arrangement direction matching the principal stress direction around the inlay.

3. The tool head made of locally metal-reinforced epoxy-based carbon fiber composite material according to claim 1, characterized in that, The epoxy-based carbon fiber composite material comprises an epoxy resin matrix and a carbon fiber reinforcement; the carbon fiber reinforcement is any of the following: continuous unidirectional carbon fiber, chopped carbon fiber, carbon fiber fabric, and three-dimensional braided carbon fiber preform. The layup is optimized based on the principal stress trajectory line of the tool head working condition finite element simulation, so that the carbon fiber orientation is consistent with the principal stress direction of the component.

4. The locally metal-reinforced epoxy carbon fiber composite tool head according to claim 1, characterized in that, The material of the partial metal inlay is any of the following: tool steel, high-speed steel, cemented carbide, and 4340 alloy steel.

5. The tool head made of locally metal-reinforced epoxy carbon fiber composite material according to claim 1, characterized in that, When the tool head is a hydraulic pliers tool head, the functional area is the jaw clamping part, and the partial metal inlay is only provided on the clamping contact surface to form wear-resistant clamping teeth.

6. The tool head made of locally metal-reinforced epoxy-based carbon fiber composite material according to claim 1, characterized in that, When the tool head is a hydraulic shear tool head, the functional area is the shearing blade area, and the local metal inlay is a continuous or discontinuous thin sheet inlay, which is only arranged at the cutting edge line.

7. The locally metal-reinforced epoxy carbon fiber composite tool head according to claim 1, characterized in that, When the tool head is a hydraulic crimping tool head, the functional area is the cable crimping part, and the contact area is fully covered by local metal inlays to form a wear-resistant and pressure-bearing contact surface.

8. The locally metal-reinforced epoxy carbon fiber composite tool head according to claim 1, characterized in that, The connection area of ​​the composite material body is provided with a metal connection seat. The metal connection seat is a metal insert embedded inside the composite material body or a metal sleeve covering the outer wall of the connection area. The metal connection seat is used to detachably connect with the hydraulic cylinder piston rod through a threaded or flanged structure.

9. A method for preparing a locally metal-reinforced epoxy-based carbon fiber composite tool head according to any one of claims 1 to 8, characterized in that, It includes the following steps: Step 1: Use finite element software to simulate the stress and strain distribution of the tool head under rated working conditions, extract the principal stress trajectory lines, determine the carbon fiber layup angle and layup thickness distribution, and simultaneously delineate the pre-embedded positions and geometric dimensions of local metal inserts. Step 2: Select carbon fiber prepreg based on simulation results, and lay it in layers in the mold using automatic tape laying or manual laying process. Lay a continuous unidirectional carbon fiber layer in the main stress area. Step 3: The surface of the local metal inlay is successively subjected to sandblasting roughening, acid pickling etching, ultrasonic cleaning, and plasma activation treatment. The surface is coated with silane coupling agent or epoxy primer and fixed to the preset embedded position of the mold using a special positioning fixture. Step 4: Place the mold with the completed layup into an autoclave or molding machine to cure the epoxy resin matrix, so as to achieve an integrated interface between the metal insert and the composite material body. Step 5: The cured blank is milled, drilled, and finished to meet the design dimensions and geometric tolerance standards; Step 6: For the high-stress interface area where the edge of the metal inlay fits into the composite material body as determined by finite element simulation, mechanical riveting or high-pressure injection of structural adhesive is performed inside the machined groove to complete the secondary composite fixation of the metal inlay and the composite material body. Step 7: Perform plasma or corona surface activation on the entire finished component; Step 8: A coating layer is formed on the outer surface of the main body of the composite material through injection molding, rubber vulcanization, and spraying processes to obtain the finished tool head.

10. The preparation method according to claim 9, characterized in that, In step four, the epoxy resin matrix is ​​cured by maintaining the temperature at 120~180℃ and 0.4~1.0MPa for 2~4 hours. In step five, the cured blank is milled, drilled, and finished using a five-axis CNC machining center with diamond-coated tools to meet the design dimensions and geometric tolerance standards.

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