Split type machining tool

Abstract

A split type machining tool comprises a tool handle, a tool bit, a fastener and a spacer ring, the fastener and the tool handle are locked so that the tool bit can be fixed to the tool handle, the spacer ring is arranged on the fastener in a sleeved mode, at least one part of the spacer ring is located in the tool bit, and when the fastener and the tool handle are completely locked, the rear end face of the tool bit makes contact with the front end face of the tool handle; the cutter handle and the cutter head oppositely extrude the spacer ring in the axial direction so that the spacer ring can deform in the radial direction, and the outer side face and the inner side face of the spacer ring are in interference fit with the cutter head and the fastener correspondingly. According to the machining tool, the distance ring is arranged in the tool bit, the tool handle and the tool bit oppositely extrude the distance ring in the axial direction in the assembling process so that the distance ring can deform in the radial direction, the inner side face and the outer side face of the distance ring can tightly press the fastener and the tool bit correspondingly, and therefore close fit between the tool bit and the fastener can be achieved; therefore, the tool bit and the tool handle have good coaxiality, and the machining precision of the machining tool is guaranteed.

Description

Technical Field

[0001] The invention relates to a machining tool, in particular to a split machining tool. Background Art

[0002] Machining centers usually use machining tools to process workpieces, such as milling, turning and other machining operations. In order to process workpieces with higher hardness, some machining tools are made of hard metals, such as tungsten steel.

[0003] However, if the entire machining tool is formed of hard metal, the cost of the machining tool will be too high, and the manufacturing process of the machining tool will be difficult. In order to overcome the above problems, some machining tools will adopt a split structure. For example, Chinese utility model CN206253708U discloses a split carbide milling cutter, in which the cutter head and the shank are connected and fixed by screws, and the bottom of the cutter head is provided with a raised end, and the shank is provided with a "well"-shaped groove inlaid with the raised end, thereby forming a stable positioning. The milling cutter can form a cutter head and a shank respectively by different materials, thereby reducing the overall cost.

[0004] However, in order for the bolt to pass through the cutter head smoothly, there must be a radial fit clearance between the cutter head and the screw. When the screw and the tool handle are locked, the above fit clearance will affect the coaxiality of the cutter head and the tool handle, that is, the degree of deviation between the axes of the cutter head and the tool handle is large, thereby affecting the machining accuracy of the machining tool on the workpiece. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to design a split machining tool that can eliminate the radial matching clearance, so that the tool head and the tool handle can obtain good coaxiality, thereby ensuring machining accuracy.

[0006] To achieve the above-mentioned purpose, the present invention provides a split type machining tool, comprising: a tool handle, a tool head and a fastener, wherein the fastener is locked with the tool handle to fix the tool head to the tool handle, and the machining tool further comprises: a spacer ring, wherein the spacer ring is sleeved on the fastener and at least a part of the spacer ring is located inside the tool head, and when the fastener is completely locked with the tool handle, the rear end face of the tool head contacts the front end face of the tool handle, and the tool handle and the tool head axially press the spacer ring toward each other to deform the spacer ring radially, and the outer side surface and the inner side surface of the spacer ring are respectively interference fit with the tool head and the fastener. Among them, since the spacer ring is installed inside the tool head, and the tool handle and the tool head axially press the spacer ring toward each other during assembly to deform the spacer ring radially, the inner and outer sides of the spacer ring are pressed against the fastener and the tool head respectively, so that the close fit between the tool head and the fastener can be achieved, so that the tool head and the tool handle obtain good coaxiality, and the machining accuracy of the machining tool is guaranteed.

[0007] Furthermore, the tool head is provided with a positioning groove for accommodating the spacer ring, and the positioning groove is provided with a front positioning part and a rear positioning part from front to back, the front positioning part is a truncated cone-shaped groove which is narrow in front and wide in back, and the rear positioning part is a cylindrical groove; the spacer ring is provided with a front ring body and a rear ring body from front to back, the front ring body is a truncated cone body which is narrow in front and wide in back, and the rear ring body is a cylindrical body, and when the fastener is completely locked with the handle, the outer side surface of the front ring body is interference fit with the inner side surface of the front positioning part, and the outer side surface of the rear ring body is interference fit with the inner side surface of the rear positioning part. Among them, since the front positioning part and the front ring body both have a taper, the outer side surface of the front ring body and the inner side surface of the front positioning part are both inclined relative to the axial direction. Compared with the surface parallel to the axial direction, when the spacer ring is squeezed by the axial force, the inclined surface is more likely to convert the axial force into the radial force, so that the front ring body of the spacer ring is more likely to be radially deformed.

[0008] Furthermore, the diameter of the rear end of the front positioning part is equal to the diameter of the rear positioning part; the diameter of the rear end of the front ring body is equal to the diameter of the rear ring body. Compared with the stepped structure, the manufacturing process of the above structure is simpler and the manufacturing cost is lower.

[0009] Furthermore, the diameter of the front end of the front positioning part is smaller than the diameter of the front end of the front ring body, and the diameter of the rear positioning part is larger than the diameter of the rear positioning part. When the outer side surface of the front ring body and the inner side surface of the front positioning part are initially in contact, there is a gap between the front end face of the spacer ring and the front end face of the positioning groove, and the rear end of the spacer ring protrudes backward from the positioning groove, and the width of the spacer ring protruding backward from the positioning groove is larger than the gap width between the front end face of the spacer ring and the front end face of the positioning groove. Among them, since the front positioning part and the front ring body are both tapered, and the diameter of the front end of the front positioning part is smaller than the diameter of the front end of the front ring body, the user must use a tool to lock the fastener with the tool handle, so as to ensure that the tool handle exerts sufficient axial extrusion force on the spacer ring and ensure radial deformation of the spacer ring; since the width of the spacer ring protruding backward from the positioning groove is larger than the gap width between the front end face of the spacer ring and the front end face of the positioning groove, the spacer ring can fill the entire positioning groove after radial deformation, so that the tool head, the spacer ring and the fastener fit tightly.

[0010] Furthermore, the cutter head is also provided with a through hole and a sunken groove, and the positioning groove, the through hole and the sunken groove are connected in sequence from the back to the front; the fastener is a screw, and the screw is provided with a nail head, a spindle and a screw rod in sequence from the front to the back, the nail head is located in the sunken groove, and the spindle passes through the through hole and the spacer ring in sequence from the front to the back; the handle is provided with a screw hole, and the screw rod is screwed with the screw hole. Among them, the screw is fixedly connected with the handle by screwing, which is very convenient for the disassembly and assembly of the cutter head.

[0011] Furthermore, the cutter head is provided with a plurality of teeth, which are evenly arranged in a circular array around the axis of the machining tool; the nail head is a polygonal column, the recessed groove is a polygonal columnar groove matching the nail head, the number of the teeth is consistent with the number of the inner side surfaces of the recessed groove, and the blades of the plurality of teeth are arranged one by one in the radial direction relative to the plurality of inner side surfaces of the recessed groove. The blades of the teeth are arranged in the radial direction at positions corresponding to the inner side surfaces of the recessed groove, so that the radial dimension corresponding to the position of the blade is larger, thereby ensuring that the blade position has good mechanical strength, thereby obtaining a longer service life.

[0012] Furthermore, a water-passing concave portion is provided on the inner side of the concave groove, and the water-passing concave portion is concave outward in the radial direction. The water-passing concave portion is provided on the inner side of the concave groove to fully utilize the space near the axis of the cutter head. It is not necessary to provide an additional water-passing hole between two adjacent teeth, which reduces the manufacturing cost on the one hand, and ensures the mechanical strength of the entire cutter head on the other hand.

[0013] Furthermore, the handle is also provided with a spindle hole, the spindle hole is recessed from the front end surface of the handle, the spindle hole is connected to the screw hole front and back, and the diameter of the spindle hole is larger than the diameter of the screw hole, and the rear end of the spindle is embedded in the spindle hole. The cooperation between the spindle and the spindle hole is conducive to improving the coaxiality of the fastener and the handle, thereby improving the coaxiality of the cutter head and the handle.

[0014] Furthermore, the machining tool further comprises: an elastic ring, an outer annular groove is provided on the side of the mandrel, an inner annular groove is provided on the inner side of the spacer ring, and the elastic ring is sleeved in the outer annular groove and located in the inner annular groove. The provision of the elastic ring can fix the screw to the spacer ring, and because the nail head is located in the concave groove, the spacer ring can be prevented from falling off the tool head before the screw is locked to the tool handle.

[0015] Furthermore, the spacer ring is formed of polyetheretherketone containing carbon fiber. Since polyetheretherketone containing carbon fiber has good toughness, the spacer ring is more closely matched with the cutter head and the fastener after deformation, thereby ensuring good coaxiality between the cutter head and the handle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An exploded view of a machining tool according to Embodiment 1 of the present invention;

[0017] Figure 2 AA cross-sectional view of the machining tool involved in Example 1 of the present invention;

[0018] Figure 3 It is a partial view of the machining tool involved in Example 1 of the present invention at circle Q;

[0019] Figure 4BB is a cross-sectional view of the cutter head involved in Example 1 of the present invention;

[0020] Figure 5 It is a CC cross-sectional view of the spacer ring involved in Example 1 of the present invention;

[0021] Figure 6 This is a schematic diagram of the assembly process of the spacer ring and the cutter head involved in Example 1 of the present invention;

[0022] Figure 7 This is a schematic diagram of the assembly process of the spacer ring and the cutter head involved in Example 2 of the present invention;

[0023] Figure 8 It is a partial view of the machining tool involved in Example 3 of the present invention at circle Q.

[0024] The accompanying drawings are marked as follows:

[0025] 1-handle; 11-spindle hole; 12-screw hole; 13-water inlet channel; 14-annular boss;

[0026] 2-cutter head; 21-positioning groove; 211-front positioning part; 212-rear positioning part; 22-through hole; 23-sunk groove; 230-water concave part; 24-tooth part; 25-chip groove;

[0027] 3-fastener; 31-nail head; 32-spindle; 320-outer annular groove; 33-screw; 34-water passage;

[0028] 4-spacer ring; 41-front ring body; 42-rear ring body; 43-inner annular groove;

[0029] 5- Elastic ring. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is further described below by way of embodiments:

[0031] [Example 1]

[0032] The present invention provides a split type machining tool, combined with Figure 1-3As shown, the machining tool comprises: a shank 1, a cutter head 2, a fastener 3 and a spacer ring 4, at least a part of the fastener 3 is located inside the cutter head 2, the fastener 3 is locked with the shank 1 to fix the cutter head 2 to the shank 1, the axis of the machining tool passes through the shank 1 and the fastener 3, the cutter head 2 is a hollow body, the spacer ring 4 is sleeved on the fastener 3 and at least a part of the spacer ring 4 is located inside the cutter head 2, when the fastener 3 is completely locked with the shank 1, the shank 1 and the cutter head 2 axially press the spacer ring 4 toward each other to deform the spacer ring 4 radially, and the outer side and inner side of the spacer ring 4 are respectively interference fit with the cutter head 2 and the fastener 3. It should be noted that the fastener 3 and the shank 1 are completely locked, which means the state when the fastener 3 reaches the locking limit position; the axial direction of the machining tool is consistent with the front-back direction. When using the machining tool, the shank 1 can be fixed on the spindle of a machining center (such as a CNC machine tool), and the cutter head 2 can be used to perform turning or milling on the workpiece. When the cutter head 2 reaches the end of its service life, the lock between the fastener 3 and the handle 1 can be released, and the cutter head 2 can be replaced.

[0033] It is worth mentioning that in order to further reduce the cost of machining tools, some manufacturers will adopt a machine-clamped structure, that is, to manufacture a number of carbide blades, which are installed on the tool head of the machining tool by means of screws. When the blade reaches the end of its service life, only the blade needs to be replaced. Compared with the machining tool of the above structure, the entire tool head 2 of the machining tool of the present invention is integrated, and there is no need to use screws to fix the blade, which has better stability.

[0034] As a preferred solution, when the fastener 3 is completely locked with the handle 1, the rear end face of the cutter head 2 contacts the front end face of the handle 1. Since debris is generated during the processing, the contact between the rear end face of the cutter head 2 and the front end face of the handle 1 can reduce the possibility of debris entering and remaining between the cutter head 2 and the handle 1, thereby reducing the difficulty of subsequent cleaning.

[0035] In this embodiment, when the fastener 3 is completely locked with the handle 1, the spacer ring 4 is completely located inside the cutter head 2. In other embodiments, when the fastener 3 is completely locked with the handle 1, the spacer ring 4 may be partially located inside the cutter head 2, as long as the outer side surface and the inner side surface of the spacer ring 4 are respectively interference fit with the cutter head 2 and the fastener 3.

[0036] In this embodiment, the rear end of the fastener 3 protrudes backward from the rear end of the cutter head 2, the other parts of the fastener 3 are located inside the cutter head 2, and the rear end of the fastener 3 is locked with the handle 1. In other embodiments, the entire fastener 3 may be placed inside the cutter head 2, and a space for accommodating the front end of the handle 1 is provided at the rear end of the cutter head 2. When the fastener 3 is completely locked with the handle 1, the front end of the handle 1 is also located inside the cutter head 2.

[0037] In this embodiment, the machining tool is a square shoulder milling cutter. In other embodiments, the machining tool may also be other milling cutters, such as round nose cutters; in addition to milling cutters, the machining tool may also be other types of cutters, such as straight edge reamer, spiral edge reamer, T-shaped cutter, etc.

[0038] Specifically, Figure 4 As shown, the tool head 2 is provided with a positioning groove 21, a through hole 22, a recessed groove 23, a plurality of teeth 24 and a plurality of chip grooves 25 for accommodating the spacer ring 4. The positioning groove 21, the through hole 22 and the recessed groove 23 are sequentially connected from back to front. The plurality of teeth 24 are evenly arranged in a circular array around the axis of the machining tool. The chip groove 25 is located between two adjacent teeth 24. The fastener 3 passes through the through hole 22. When the fastener 3 and the tool handle 1 are completely locked, the outer side surface of the spacer ring 4 is interference fit with the inner side surface of the positioning groove 21. In the process of assembling the machining tool, first put the spacer ring 4 into the positioning groove 21, then pass the fastener 3 through the through hole 22 and the spacer ring 4, and then lock the fastener 3 with the tool handle 1. When the fastener 3 and the tool handle 1 are completely locked, the tool handle 1 contacts the spacer ring 4, and the tool handle 1 and the positioning groove 21 squeeze the spacer ring 4 toward each other in the axial direction, so that the spacer ring 4 is deformed in the radial direction, so that the outer side surface of the spacer ring 4 and the inner side surface of the positioning groove 21 are interference fit, and the inner side surface of the spacer ring 4 and the fastener 3 are interference fit, thereby eliminating the matching clearance between the cutter head 2 and the fastener 3. When using the machining tool, the blade of the tooth portion 24 is used to process the workpiece, and the chips generated by the processing are discharged backward through the chip groove 25, thereby ensuring the smoothness of the processing.

[0039] In this embodiment, combined with Figure 4 and 5 As shown, the positioning groove 21 is provided with a front positioning portion 211 and a rear positioning portion 212 from front to back, the front positioning portion 211 is a truncated cone-shaped groove which is narrow in front and wide in the back, the rear positioning portion 212 is a cylindrical groove, and the diameter of the rear end of the front positioning portion 211 is equal to the diameter of the rear positioning portion 212; the spacer ring 4 is provided with a front ring body 41 and a rear ring body 42 from front to back, the front ring body 41 is a truncated cone-shaped groove which is narrow in front and wide in the back, the rear ring body 42 is a cylindrical body, the diameter of the rear end of the front ring body 41 is equal to the diameter of the rear ring body 42, the diameter of the front end of the front positioning portion 211 is smaller than the diameter of the front end of the front ring body 41, the diameter of the rear positioning portion 212 is larger than the diameter of the rear positioning portion 212, when the fastener 3 is completely locked with the shank 1, the outer side surface of the front ring body 41 is interference fit with the inner side surface of the front positioning portion 211, and the outer side surface of the rear ring body 42 is interference fit with the inner side surface of the rear positioning portion 212. During the assembly process, as shown in FIG. Figure 6As shown, since the front positioning portion 211 and the front ring body 41 are both tapered, and the diameter of the front end of the front positioning portion 211 is smaller than the diameter of the front end of the front ring body 41, the spacer ring 4 will encounter axial resistance when placed into the positioning groove 21. After the spacer ring 4 is manually placed, there will be a gap between the front end surface of the spacer ring 4 and the front end surface of the positioning groove 21, and the spacer ring 4 cannot usually be further pressed into the spacer ring 4 by manpower alone. In the process of locking the fastener 3 with the tool handle 1, the tool handle 1 will contact the spacer ring 4, and the axial force generated by the locking process will be used to press the spacer ring 4 further into the positioning groove 21. This extrusion process will cause the spacer ring 4 to undergo radial deformation. In other embodiments, the front positioning portion 211 and the rear positioning portion 212 may also be grooves of other shapes, and correspondingly, the front ring body 41 and the rear ring body 42 may also be columns of other shapes, for example: the front positioning portion 211 is a quadrangular cone-shaped groove, the rear positioning portion 212 is a quadrangular prism-shaped groove, the front ring body 41 is a quadrangular cone body, and the rear ring body 42 is a quadrangular prism body. The above shapes can also cause the spacer ring 4 to undergo radial deformation through axial extrusion. However, compared with other shapes, the radial deformation of the truncated cone-shaped front ring body 41 and the cylindrical rear ring body 42 will be more uniform. In addition, in this embodiment, the taper of the front positioning portion 211 is equal to the taper of the front ring body 41, so that it is less difficult to press the spacer ring 4, and after the spacer ring 4 is fully pressed in, the front ring body 41 and the front positioning portion 211 can fully fit.

[0040] In this embodiment, if Figure 6 As shown, when the outer side surface of the front ring body 41 is initially in contact with the inner side surface of the front positioning portion 211 (i.e., the fastener 3 and the handle 1 are not locked, and the spacer ring 4 has not undergone any deformation), there is a gap between the front end surface of the spacer ring 4 and the front end surface of the positioning groove 21, and the rear end of the spacer ring 4 protrudes backward from the positioning groove 21, and the width of the spacer ring 4 protruding backward from the positioning groove 21 is greater than the gap width between the front end surface of the spacer ring 4 and the front end surface of the positioning groove 21. It should be noted that the above width refers to the axial dimension, that is, before the spacer ring 4 is deformed, the axial dimension of the spacer ring 4 is greater than the axial dimension of the positioning groove 21. When the front end face of the spacer ring 4 contacts the front end face of the positioning groove 21, the width of the spacer ring 4 protruding backward from the positioning groove 21 becomes smaller. When the fastener 3 is completely locked with the tool handle 1, the front end face of the tool handle 1 contacts the rear end face of the tool head 2. The remaining width of the spacer ring 4 protruding backward from the positioning groove 21 is converted into a radial dimension as the spacer ring 4 is deformed, thereby filling the entire positioning groove 21.

[0041] In this embodiment, please continue to refer to Figure 3As shown, the fastener 3 is a screw, and the screw is provided with a nail head 31, a spindle 32 and a screw rod 33 from front to back. The nail head 31 is located in the concave groove 23, and the spindle 32 passes through the through hole 22 and the spacer ring 4 from front to back. The handle 1 is provided with a spindle hole 11 and a screw hole 12. The spindle hole 11 is recessed from the front end surface of the handle 1. The spindle hole 11 is connected to the screw hole 12 front to back and the diameter of the spindle hole 11 is larger than the diameter of the screw hole 12. The rear end of the spindle 32 is embedded in the spindle hole 11, and the screw rod 33 is screwed with the screw hole 12. The screw and the handle 1 are assembled by screwing. In the process of tightening the screw, the handle 1 will squeeze the spacer ring 4 forward, causing the spacer ring 4 to undergo radial deformation. When the fastener 3 and the handle 1 are completely locked, the inner side of the spacer ring 4 is interference fit with the spindle 32. In other embodiments, the fastener 3 can also be other types of fasteners, such as bolts, screws, etc.

[0042] For details, please continue to refer to Figure 3 and 4 As shown, the nail head 31 is a polygonal column, the concave groove 23 is a polygonal column groove matching the nail head 31, the number of teeth 24 is consistent with the number of inner sides of the concave groove 23, and the blades of the multiple teeth 24 are arranged one by one in the radial direction relative to the multiple inner sides of the concave groove 23, that is, the blades of the teeth 24 are located radially on the outer side corresponding to the inner side of the concave groove 23. After the screw is installed in the cutter head 2, the nail head 31 is embedded in the concave groove 23, and during the screwing process, the cutter head 2 rotates with the screw. In this embodiment, the nail head 31 is a pentagonal column, the concave groove 23 is a pentagonal column groove, there are five teeth 24, and the blade of each tooth 24 is arranged radially relative to one inner side of the concave groove 23.

[0043] More specifically, a water-passing concave portion 230 is provided on the inner side of the concave sink 23, and the water-passing concave portion 230 is recessed radially outward. After the screw is assembled, a spray channel is formed between the side of the nail head 31 and the water-passing concave portion 230, and the spray channel is connected to the through hole 22. The coolant can be sprayed toward the blade of the tooth portion 24 through the channel, thereby achieving a cooling effect and preventing the blade from being deformed due to overheating.

[0044] More specifically, the handle 1 is further provided with a water inlet channel 13, which extends forward from the rear end face of the handle 1 and communicates with the screw hole 12; the screw is further provided with a water passage 34, the inlet of which is located at the rear end face of the screw, and the outlet of which is located at the side of the screw. When the fastener 3 is completely locked with the handle 1, the outlet of the water passage 34 communicates with the through hole 22. During processing, the coolant enters from the water inlet channel 13, passes through the screw hole 12, the water passage 34, the through hole 22 in sequence, and finally sprays to the blade of the tooth portion 24 through the spray channel.

[0045] More specifically, the water passage 34 is provided with a main passage and a plurality of branch passages, the axis of the machining tool passes through the main passage, the main passage extends forward from the rear end face of the screw, and the plurality of branch passages are all connected to the main passage, and the branch passages extend to the side faces of the screw. During machining, the coolant enters from the main passage, passes through the branch passages and flows to the through hole 22.

[0046] For details, please continue to refer to Figure 1-3 As shown, the machining tool also includes: an elastic ring 5, an outer annular groove 320 is provided on the side of the mandrel 32, an inner annular groove 43 is provided on the inner side of the spacer ring 4, and the elastic ring 5 is sleeved in the outer annular groove 320 and located in the inner annular groove 43. When the screw is transferred, the elastic ring 5 is first installed in the outer annular groove 320 so that the elastic ring 5 is initially positioned on the screw, and then the screw is passed through the spacer ring 4. The elastic ring 5 is deformed due to extrusion until the elastic ring 5 reaches the inner annular groove 43 and then recovers. The inner annular groove 43 limits the elastic ring 5 in the axial direction, so that the screw cannot be removed from the spacer ring 4 in a non-destructive manner. In addition, since the spacer ring 4 will be in interference fit with the positioning groove 21 and the screw after radial deformation, it is also difficult to remove from the cutter head 2. Therefore, when replacing the cutter head 2, the cutter head 2, the fastener 3 and the spacer ring 4 need to be replaced together.

[0047] As a preferred solution, the cutter head 2 is formed of hard alloy, such as tungsten steel, and the cutter head 2 formed of hard alloy can cut workpieces with relatively high hardness. As for the handle 1, the fastener 3 and the elastic ring 5, since they do not need to contact the workpiece, they can be formed of hard alloy or other metal materials, such as steel, and the present invention does not limit this.

[0048] As a preferred solution, the spacer ring 4 is formed of polyetheretherketone (Peek) containing carbon fiber. Traditional polyetheretherketone has excellent properties such as high temperature resistance and chemical corrosion resistance, but has a low elastic modulus and insufficient toughness. Adding carbon fiber can increase the elastic modulus of the spacer ring 4 and enhance toughness. After the spacer ring 4 is deformed, it cooperates more closely with the cutter head 2 and the fastener 3.

[0049] [Example 2]

[0050] In this embodiment, if Figure 7 As shown, the diameter of the rear end of the front positioning portion 211 is smaller than the diameter of the rear positioning portion 212, and the diameter of the rear end of the front ring body 41 is equal to the diameter of the rear ring body 42. In other words, the inner side surface of the positioning groove 21 is provided with a step, and correspondingly, the outer side surface of the spacer ring 4 is provided with a step. In the process of locking the fastener 3 with the handle 1, the step of the positioning groove 21 will squeeze the step of the spacer ring 4 in the axial direction, so that the rear ring body 42 of the spacer ring 4 will be radially deformed. The other structures of this embodiment are the same as those of embodiment 1, and will not be described in detail here.

[0051] Compared with Example 1, since this embodiment increases the axial extrusion force at the step position, the extrusion effect is better, so the spacer ring 4 can be more easily radially deformed. However, setting the step will increase the difficulty of manufacturing the cutter head 2 and the spacer ring 4.

[0052] [Example 3]

[0053] In this embodiment, if Figure 8 As shown, when the outer side surface of the front ring body 41 is initially in contact with the inner side surface of the front positioning portion 211, the spacer ring 4 is completely located in the positioning groove 21, and the rear end surface of the spacer ring 4 is located in front of the opening of the positioning groove 21. The handle 1 is also provided with an annular boss 14, and the annular boss 14 protrudes forward from the front end surface of the handle 1. When the fastener 3 is completely locked with the handle 1, the annular boss 14 squeezes the spacer ring 4 forward, and the annular boss 14 is embedded in the positioning groove 21. In the process of locking the fastener 3 with the handle 1, the annular boss 14 contacts the rear end surface of the spacer ring 4 and squeezes the spacer ring 4, causing the spacer ring 4 to undergo radial deformation. In addition, since the annular boss 14 is embedded in the positioning groove 21, it can occupy a part of the axial space of the positioning groove 21 and compress the axial space occupied by the spacer ring 4, thereby ensuring that the spacer ring 4 undergoes sufficient radial deformation. The other structures of this embodiment are the same as those of embodiment 1, and will not be described in detail here.

[0054] Compared with Example 1, this embodiment adds an annular boss 14 to axially extrude the spacer ring 4, and during the extrusion process, the outer side surface of the annular boss 14 cooperates with the inner side surface of the positioning groove 21, which is beneficial to improving the coaxiality. However, the provision of the annular boss 14 will increase the manufacturing difficulty of the tool handle 1, and also increases the requirements for the matching accuracy of the tool handle 1 and the tool head 2, that is, the manufacturing accuracy requirements of the two.

Claims

1. A split type machining tool, comprising: A tool handle, a tool head and a fastener, wherein the fastener is locked with the tool handle to fix the tool head to the tool handle, and is characterized in that: the processing tool also includes: a spacer ring, the spacer ring is sleeved on the fastener and at least a portion of the spacer ring is located inside the tool head, when the fastener is completely locked with the tool handle, the rear end face of the tool head contacts the front end face of the tool handle, the tool handle and the tool head squeeze the spacer ring toward each other in the axial direction to cause the spacer ring to deform in the radial direction, and the outer side surface and the inner side surface of the spacer ring are respectively interference fit with the tool head and the fastener.

2. The split type machining tool according to claim 1, characterized in that: The cutter head is provided with a positioning groove for accommodating a spacer ring, and the positioning groove is provided with a front positioning portion and a rear positioning portion in sequence from front to back, the front positioning portion is a truncated cone-shaped groove which is narrow in front and wide in rear, and the rear positioning portion is a cylindrical groove; the spacer ring is provided with a front ring body and a rear ring body in sequence from front to back, the front ring body is a truncated cone body which is narrow in front and wide in rear, and the rear ring body is a cylindrical body, and when the fastener is completely locked with the tool handle, the outer side surface of the front ring body is interference fit with the inner side surface of the front positioning portion, and the outer side surface of the rear ring body is interference fit with the inner side surface of the rear positioning portion.

3. The split type machining tool according to claim 2, characterized in that: The diameter of the rear end of the front positioning portion is equal to the diameter of the rear positioning portion; the diameter of the rear end of the front ring body is equal to the diameter of the rear ring body.

4. The split type machining tool according to claim 2, characterized in that: The diameter of the front end of the front positioning portion is smaller than the diameter of the front end of the front ring body, and the diameter of the rear positioning portion is larger than the diameter of the rear positioning portion. When the outer side surface of the front ring body initially contacts the inner side surface of the front positioning portion, there is a gap between the front end face of the spacer ring and the front end face of the positioning groove. The rear end of the spacer ring protrudes backward from the positioning groove, and the width of the spacer ring protruding backward from the positioning groove is greater than the width of the gap between the front end face of the spacer ring and the front end face of the positioning groove.

5. The split type machining tool according to claim 2, characterized in that: The cutter head is also provided with a through hole and a recessed groove, and the positioning groove, the through hole and the recessed groove are connected in sequence from back to front; the fastener is a screw, and the screw is provided with a nail head, a spindle and a screw rod in sequence from front to back, the nail head is located in the recessed groove, and the spindle passes through the through hole and the spacer ring in sequence from front to back; the knife handle is provided with a screw hole, and the screw rod is screwed into the screw hole.

6. The split type machining tool according to claim 5, characterized in that: The cutter head is also provided with a plurality of teeth, which are evenly arranged in a circular array around the axis of the machining tool; the nail head is a polygonal cylinder, and the recessed groove is a polygonal columnar groove matching the nail head. The number of the teeth is consistent with the number of inner sides of the recessed groove, and the blades of the plurality of teeth are respectively arranged one by one relative to the plurality of inner sides of the recessed groove in the radial direction.

7. The split type machining tool according to claim 6, characterized in that: The inner side surface of the concave sink is provided with a water passing concave portion, and the water passing concave portion is concave outward in the radial direction.

8. The split type machining tool according to claim 5, characterized in that: The knife handle is also provided with a spindle hole, which is recessed from the front end surface of the knife handle, is connected to the screw hole front and back, and has a diameter larger than that of the screw hole, and the rear end of the spindle is embedded in the spindle hole.

9. The split type machining tool according to claim 8, characterized in that: The machining tool further comprises: an elastic ring, an outer annular groove is arranged on the side surface of the spindle, an inner annular groove is arranged on the inner side surface of the spacer ring, and the elastic ring is sleeved in the outer annular groove and located in the inner annular groove.

10. The split type machining tool according to claim 1, characterized in that: The spacer ring is formed of polyetheretherketone containing carbon fibers.

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