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 tool bit is fixed to 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, and the tool handle and the tool bit oppositely extrude the distance ring in the axial direction during assembly to enable the distance ring to deform in the radial direction, so that the inner side face and the outer side face of the distance ring tightly press the fastener and the tool bit respectively, 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] This utility model relates to machining tools, and more particularly to a split-type machining tool. Background Technology

[0002] Machining centers typically use cutting tools to process workpieces, such as milling and turning. To process workpieces with high hardness, some cutting tools are made of hard metals, such as tungsten carbide.

[0003] However, if the entire machining tool is made of cemented carbide, the cost would be too high, and the manufacturing process would be more difficult. To overcome these problems, some machining tools adopt a split structure. For example, Chinese utility model CN206253708U discloses a split cemented carbide end mill, in which the cutter head and shank are connected and fixed by screws, and the bottom of the cutter head has a raised end, while the shank has a "well"-shaped groove that fits into the raised end, thus forming a stable positioning. This end mill can use different materials to form the cutter head and shank separately, thereby reducing the overall cost.

[0004] However, in order for the bolt to pass smoothly through the cutter head, there will inevitably be a radial clearance between the cutter head and the screw. When the screw and the tool holder are locked, the clearance will affect the coaxiality of the cutter head and the tool holder, that is, the axis of the cutter head and the tool holder will deviate significantly, thus affecting the machining accuracy of the workpiece. Utility Model Content

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to design a split machining tool that can eliminate the radial clearance, thereby enabling the tool head and tool holder to achieve good coaxiality and thus ensuring machining accuracy.

[0006] To achieve the above objectives, this utility model provides a split-type machining tool, comprising: a tool holder, a cutting head, and a fastener. The fastener is locked to the tool holder to fix the cutting head to the tool holder. The machining tool further comprises: a spacer ring, which is sleeved on the fastener, with at least a portion of the spacer ring located inside the cutting head. When the fastener and the tool holder are fully locked, the tool holder and the cutting head press against each other axially to cause the spacer ring to deform radially. The outer and inner surfaces of the spacer ring are respectively press-fitted with the cutting head and the fastener. Because a spacer ring is installed inside the cutting head, and the tool holder and the cutting head press against each other axially during assembly, causing the spacer ring to deform radially, the inner and outer surfaces of the spacer ring tightly press against the fastener and the cutting head, respectively. Therefore, a tight fit between the cutting head and the fastener is achieved, resulting in good coaxiality between the cutting head and the tool holder, ensuring the machining accuracy of the machining tool.

[0007] Further, the tool head is provided with a positioning groove for accommodating the spacer ring, the positioning groove is sequentially provided with a front positioning part and a rear positioning part from front to rear, the front positioning part is a circular truncated cone slot with a narrow front and a wide rear, and the rear positioning part is a cylindrical slot; the spacer ring is sequentially provided with a front ring body and a rear ring body from front to rear, the front ring body is a circular truncated cone body with a narrow front and a wide rear, and the rear ring body is a cylinder, when the fastener is completely locked with the tool handle, the outer side surface of the front ring body is in interference fit with the inner side surface of the front positioning part, and the outer side surface of the rear ring body is in interference fit with the inner side surface of the rear positioning part; wherein, 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 relatively inclined in the axial direction, compared with the surface parallel to the axial direction, when the spacer ring is pressed 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] Further, the diameter of the rear end of the front positioning part is equal to the diameter of the rear positioning part, and the diameter of the rear end of the front ring body is equal to the diameter of the rear ring body; wherein, compared with the stepped structure, the manufacturing process of the above structure is simpler, and the manufacturing cost is lower.

[0009] Further, 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 greater than the diameter of the rear positioning part; when the outer side surface of the front ring body is initially in contact with the inner side surface of the front positioning part, there is a gap between the front end surface of the spacer ring and the front end surface of the positioning groove, the rear end of the spacer ring protrudes rearward from the positioning groove, and the width of the spacer ring protruding rearward from the positioning groove is greater than the gap width between the front end surface of the spacer ring and the front end surface of the positioning groove; wherein, since the front positioning part and the front ring body both have a taper, 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 generates sufficient axial pressing force on the spacer ring, and ensure that the spacer ring is radially deformed; since the width of the spacer ring protruding rearward from the positioning groove is greater than the gap width between the front end surface of the spacer ring and the front end surface of the positioning groove, the spacer ring can fill the entire positioning groove after being radially deformed, so that the tool head, the spacer ring and the fastener are tightly fitted.

[0010] Further, the tool head is further provided with a through hole and a recessed groove, the positioning groove, the through hole and the recessed groove are sequentially communicated from rear to front; the fastener is a screw, the screw is sequentially provided with a nail head, a mandrel and a screw rod from front to rear, the nail head is located in the recessed groove, the mandrel sequentially passes through the through hole and the spacer ring from front to rear; the tool handle is provided with a screw hole, and the screw rod is screwed with the screw hole; wherein, the screw is fixedly connected with the tool handle in a screwing manner, and the disassembly and assembly of the tool head is very convenient.

[0011] Further, the tool head is also provided with a plurality of tooth portions which are uniformly arranged in a circumferential array around the shaft center of the machining tool; the nail head is a polygonal column, the recessed groove is a polygonal column groove matched with the nail head, the number of the tooth portions is consistent with the number of the inner side surfaces of the recessed groove, and the edges of the plurality of tooth portions are respectively arranged opposite to the plurality of inner side surfaces of the recessed groove in the radial direction. Wherein, the edges of the tooth portions are arranged at positions corresponding to the inner side surfaces of the recessed groove in the radial direction, so that the radial dimension of the position where the edges are located is larger, thereby ensuring that the edge position has good mechanical strength, and a longer service life is obtained.

[0012] Further, the inner side surface of the recessed groove is provided with a water passing recessed portion which is recessed outward in the radial direction. Wherein, the water passing recessed portion arranged on the inner side surface of the recessed groove can make full use of the space near the shaft center of the tool head. It is not necessary to additionally arrange a water passing hole between two adjacent tooth portions, which on the one hand reduces the manufacturing cost, and on the other hand ensures the mechanical strength of the whole tool head.

[0013] Further, the tool handle is also provided with a mandrel hole which is recessed from the front end surface of the tool handle, the mandrel hole is in communication with the screw hole in front and back, and the diameter of the mandrel hole is larger than that of the screw hole, and the rear end of the mandrel is embedded in the mandrel hole. Wherein, the cooperation of the mandrel and the mandrel hole is helpful to improve the coaxiality of the fastener and the tool handle, thereby improving the coaxiality of the tool head and the tool handle.

[0014] Further, the machining tool further comprises: an elastic ring, the side surface of the mandrel is provided with an outer annular groove, the inner side surface of the spacer ring is provided with an inner annular groove, and the elastic ring is sleeved in the outer annular groove and located in the inner annular groove. Wherein, the arrangement of the elastic ring can fixedly connect the screw and the spacer ring, and since the nail head is located in the recessed groove, the spacer ring can be prevented from falling off from the tool head before the screw is locked to the tool handle.

[0015] Further, the spacer ring is formed of polyether ether ketone containing carbon fibers. Wherein, since the polyether ether ketone containing carbon fibers has good toughness, the cooperation of the spacer ring with the tool head and the fastener is more close after the deformation of the spacer ring, thereby ensuring that the tool head and the tool handle have good coaxiality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is an exploded view of the machining tool related to embodiment 1 of the utility model;

[0017] Figure 2 It is an A-A sectional view of the machining tool related to embodiment 1 of the utility model;

[0018] Figure 3 It is a partial view of the machining tool related to embodiment 1 of the utility model at the circle Q;

[0019] Figure 4B-B section view of the tool head related to the embodiment 1 of the utility model;

[0020] Figure 5 C-C section view of the spacer ring related to the embodiment 1 of the utility model;

[0021] Figure 6 Assembly process schematic view of the spacer ring and the tool head related to the embodiment 1 of the utility model;

[0022] Figure 7 Assembly process schematic view of the spacer ring and the tool head related to the embodiment 2 of the utility model;

[0023] Figure 8 Local view of the machining tool at the circle Q related to the embodiment 3 of the utility model.

[0024] The signs are:

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

[0026] 2-tool head; 21-positioning groove; 211-front positioning part; 212-rear positioning part; 22-through hole; 23-recessed groove; 230-water passing recess; 24-tooth part; 25-chip removal groove;

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

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

[0029] 5-elastic ring. Specific implementation

[0030] The technical scheme of the utility model will be further described through embodiments as follows:

[0031]

Embodiment 1

[0032] The utility model provides a split type machining tool, combines Figures 1-3As shown, the machining tool comprises a shank 1, a tool head 2, a fastener 3 and a spacer ring 4, the fastener 3 is located at least partially inside the tool head 2, the fastener 3 is locked with the shank 1 to fix the tool head 2 on the shank 1, the axis of the machining tool passes through the shank 1 and the fastener 3, the tool 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 tool head 2, when the fastener 3 is completely locked with the shank 1, the shank 1 and the tool head 2 press the spacer ring 4 in the axial direction to make the spacer ring 4 deform in the radial direction, and the outer side and the inner side of the spacer ring 4 are interference-fitted with the tool head 2 and the fastener 3 respectively. It should be noted that the fastener 3 is completely locked with the shank 1 refers to the state when the fastener 3 reaches the limit position of locking; the axial direction of the machining tool is consistent with the front-rear direction. When using the machining tool, the shank 1 can be fixed on the spindle of a machining center (such as a numerical control machine tool), and the tool head 2 is used to turn or mill the workpiece. When the tool head 2 reaches the service life, the locking between the fastener 3 and the shank 1 can be released, and the tool head 2 can be replaced.

[0033] It is worth mentioning that, in order to further reduce the cost of the machining tool, some manufacturers will adopt a chuck type structure, that is, a plurality of hard alloy blades are manufactured, and the blades are installed on the tool head of the machining tool by locking screws, and when the blades reach the service life, only the blades need to be replaced. Compared with the machining tool with the above structure, the machining tool of the utility model is integrally provided with the whole tool head 2, and the blade does not need to be fixed by screws, so that the stability is better.

[0034] As a preferred scheme, when the fastener 3 is completely locked with the shank 1, the rear end face of the tool head 2 is in contact with the front end face of the shank 1. Since the machining process will produce debris, the contact between the rear end face of the tool head 2 and the front end face of the shank 1 can reduce the possibility of debris entering and remaining between the tool head 2 and the shank 1, and reduce the subsequent cleaning difficulty.

[0035] In the embodiment, when the fastener 3 is completely locked with the shank 1, the spacer ring 4 is completely located inside the tool head 2. In other embodiments, when the fastener 3 is completely locked with the shank 1, the spacer ring 4 can also be partially located inside the tool head 2, as long as the outer side and the inner side of the spacer ring 4 are interference-fitted with the tool head 2 and the fastener 3 respectively.

[0036] In the embodiment, the rear end of the fastener 3 protrudes backward from the rear end face of the tool head 2, other parts of the fastener 3 are located inside the tool head 2, and the rear end of the fastener 3 is locked with the shank 1. In other embodiments, the whole fastener 3 can be located inside the tool head 2, and a space for accommodating the front end of the shank 1 is arranged at the rear end of the tool head 2, and when the fastener 3 is completely locked with the shank 1, the front end of the shank 1 is also located inside the tool head 2.

[0037] In the embodiment, the machining tool is a square shoulder milling cutter. In other embodiments, the machining tool can be other milling cutters, such as a round nose cutter. In addition to milling cutters, the machining tool can be other types of cutters, such as straight fluted reamers, spiral fluted reamers, T-shaped cutters, and the like.

[0038] Specifically, as shown in Figure 4 , the tool head 2 is provided with a positioning groove 21 for accommodating the spacer ring 4, a through hole 22, a sunken groove 23, a plurality of tooth portions 24, and a plurality of chip flutes 25. The positioning groove 21, the through hole 22, and the sunken groove 23 are sequentially communicated from back to front. The plurality of tooth portions 24 are uniformly arranged in a circumferential array around the axis of the machining tool. The chip flutes 25 are located between adjacent two tooth portions 24. The fastener 3 passes through the through hole 22. When the fastener 3 is completely locked with the tool shank 1, the outer side surface of the spacer ring 4 is in interference fit with the inner side surface of the positioning groove 21. In the process of assembling the machining tool, the spacer ring 4 is first placed into the positioning groove 21, then the fastener 3 passes through the through hole 22 and the spacer ring 4, and then the fastener 3 is locked with the tool shank 1. When the fastener 3 is completely locked with the tool shank 1, the tool shank 1 is in contact with the spacer ring 4, and the tool shank 1 and the positioning groove 21 press the spacer ring 4 in the axial direction, so that the spacer ring 4 is deformed in the radial direction, thereby making the outer side surface of the spacer ring 4 in interference fit with the inner side surface of the positioning groove 21, and the inner side surface of the spacer ring 4 in interference fit with the fastener 3, and thus eliminating the gap between the tool head 2 and the fastener 3. In use of the machining tool, the tool edges of the tooth portions 24 are used to machine the workpiece, and the chips generated in the machining are discharged rearward through the chip flutes 25, thereby ensuring the smoothness of the machining.

[0039] In the embodiment, as shown in Figure 4 and 5 , the positioning groove 21 is sequentially provided with a front positioning portion 211 and a rear positioning portion 212 from front to back. The front positioning portion 211 is a circular truncated cone-shaped groove with the front narrow and the rear wide. The rear positioning portion 212 is a cylindrical groove. 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 sequentially provided with a front ring body 41 and a rear ring body 42 from front to back. The front ring body 41 is a circular truncated cone body with the front narrow and the rear wide. 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 greater than the diameter of the rear positioning portion 212. When the fastener 3 is completely locked with the tool shank 1, the outer side surface of the front ring body 41 is in 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 in interference fit with the inner side surface of the rear positioning portion 212. In the assembly process, as shown in Figure 6As shown, since the front positioning portion 211 and the front ring body 41 both have a taper, 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 be resisted when being put into the positioning groove 21 in the axial direction. After the spacer ring 4 is put in manually, there will be a gap between the front end face of the spacer ring 4 and the front end face of the positioning groove 21, and the spacer ring 4 cannot be pressed further into the spacer ring 4 by human force usually. During the process of locking the fastener 3 and the shank 1, the shank 1 will contact the spacer ring 4, and the spacer ring 4 will be pressed further into the positioning groove 21 by the axial force generated in the locking process, which will make the spacer ring 4 deform radially. In other embodiments, the front positioning portion 211 and the rear positioning portion 212 can also be other shapes of grooves, and correspondingly, the front ring body 41 and the rear ring body 42 can also be other shapes of columns, such as: the front positioning portion 211 is a quadrangular frustum-shaped groove, the rear positioning portion 212 is a quadrangular column-shaped groove, the front ring body 41 is a quadrangular frustum, and the rear ring body 42 is a quadrangular column. The above shapes can also make the spacer ring 4 deform radially by axial extrusion. However, compared with other shapes, the radial deformation of the front ring body 41 in the shape of a circular truncated cone and the rear ring body 42 in the shape of a circular column 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 the spacer ring 4 is less difficult to press in, and the front ring body 41 and the front positioning portion 211 can completely fit after the spacer ring 4 is completely pressed in.

[0040] In this embodiment, as shown in Figure 6 When the outer side face of the front ring body 41 initially contacts the inner side face of the front positioning portion 211 (i.e. the fastener 3 and the shank 1 are not locked, and the spacer ring 4 does not deform at all), there is a gap between the front end face of the spacer ring 4 and the front end face 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 face of the spacer ring 4 and the front end face of the positioning groove 21. It should be noted that the above width refers to the size in the axial direction, that is, before the spacer ring 4 deforms, the size of the spacer ring 4 in the axial direction is greater than the size of the positioning groove 21 in the axial direction. 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, and when the fastener 3 and the shank 1 are completely locked, the front end face of the shank 1 contacts the rear end face of the tool bit 2, and the remaining width of the spacer ring 4 protruding backward from the positioning groove 21 is converted into a radial size as the spacer ring 4 deforms, 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, which is provided with a head 31, a mandrel 32 and a screw rod 33 from front to back, the head 31 is located in the recessed groove 23, and the mandrel 32 passes through the through hole 22 and the spacer ring 4 from front to back; the shank 1 is provided with a mandrel hole 11 and a screw hole 12, the mandrel hole 11 is recessed from the front end surface of the shank 1, the mandrel hole 11 and the screw hole 12 are in communication from front to back, and the diameter of the mandrel hole 11 is larger than that of the screw hole 12, the rear end of the mandrel 32 is embedded in the mandrel hole 11, and the screw rod 33 is screwed with the screw hole 12. The screw and the shank 1 are assembled by screwing, and in the process of tightening the screw, the shank 1 will extrude the spacer ring 4 forward, so that the spacer ring 4 is deformed radially; when the fastener 3 is completely locked with the shank 1, the inner side surface of the spacer ring 4 is in interference fit with the mandrel 32. In other embodiments, the fastener 3 can also be other types of fasteners, such as bolts, screws, etc.

[0042] Specifically, please continue to refer to Figure 3 and 4 As shown, the head 31 is a polygonal column, the recessed groove 23 is a polygonal column groove matched with the head 31, the number of the tooth portions 24 is consistent with the number of the inner side surfaces of the recessed groove 23, and the cutting edges of the plurality of tooth portions 24 are respectively arranged in radial opposition to the plurality of inner side surfaces of the recessed groove 23, that is, the cutting edges of the tooth portions 24 are located on the outer side corresponding to the inner side surfaces of the recessed groove 23 in the radial direction. After the screw is assembled into the head 2, the head 31 is embedded in the recessed groove 23, and in the process of tightening the screw, the head 2 rotates together with the screw. In this embodiment, the head 31 is a pentagonal column, the recessed groove 23 is a pentagonal column groove, and the tooth portions 24 are five, and the cutting edge of each tooth portion 24 is arranged in radial opposition to one inner side surface of the recessed groove 23.

[0043] More specifically, the inner side surface of the recessed groove 23 is provided with a water passing recess 230, which is recessed outward in the radial direction. After the screw is assembled, a jet channel is formed between the side surface of the head 31 and the water passing recess 230, which is in communication with the through hole 22, and the cooling liquid can be sprayed to the cutting edges of the tooth portions 24 through the channel, thereby achieving a cooling effect to avoid deformation of the cutting edges due to overheating.

[0044] More specifically, the shank 1 is also provided with a water inlet channel 13, which extends forward from the rear end surface of the shank 1 and is in communication with the screw hole 12; the screw is also provided with a water passing channel 34, the inlet of which is located at the rear end surface of the screw, and the outlet of which is located at the side surface of the screw, and when the fastener 3 is completely locked with the shank 1, the outlet of the water passing channel 34 is in communication with the through hole 22. During machining, the cooling liquid enters from the water inlet channel 13, passes through the screw hole 12, the water passing channel 34 and the through hole 22 in sequence, and is finally sprayed to the cutting edges of the tooth portions 24 through the jet channel.

[0045] More specifically, the water passage 34 has a main channel and several branch channels. The axis of the machining tool passes through the main channel, which extends forward from the rear end face of the screw. The branch channels are all connected to the main channel and extend to the side of the screw. During machining, the coolant enters from the main channel and flows through the branch channels to the through hole 22.

[0046] For details, please continue to refer to Figures 1-3 As shown, the machining tool also includes: an elastic ring 5; an outer annular groove 320 on the side of the spindle 32; an inner annular groove 43 on the inner side of the spacer ring 4; and the elastic ring 5 is fitted into the outer annular groove 320 and located in the inner annular groove 43. When fitting a screw, 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. Then, the screw is passed through the spacer ring 4, and the elastic ring 5 deforms due to compression until it reaches the inner annular groove 43 and then returns to its original shape. The inner annular groove 43 acts as a limit for the elastic ring 5 in the axial direction, making it impossible for the screw to be removed from the spacer ring 4 in a non-destructive manner. In addition, since the spacer ring 4 will have an interference fit with the positioning groove 21 and the screw after radial deformation, it is also difficult to remove it from the tool head 2. Therefore, when replacing the tool head 2, the tool head 2, fastener 3, and spacer ring 4 need to be replaced together.

[0047] As a preferred embodiment, the cutting head 2 is made of cemented carbide, such as tungsten steel, which allows it to cut workpieces with high hardness. As for the tool holder 1, fastener 3, and elastic ring 5, since they do not need to contact the workpiece, they can be made of cemented carbide or other metal materials, such as steel; this invention does not impose any limitations.

[0048] As a preferred embodiment, the spacer ring 4 is formed of polyetheretherketone (PEEK) containing carbon fibers. Traditional PEEK has excellent properties such as high temperature resistance and chemical corrosion resistance, but it has low elastic modulus and insufficient toughness. Adding carbon fibers can improve the elastic modulus of the spacer ring 4 and enhance its toughness. After the spacer ring 4 deforms, it fits more tightly with the cutter head 2 and the fastener 3.

[0049]

Example 2

[0050] In this embodiment, as Figure 7 As shown, the diameter of the rear end of the front positioning part 211 is smaller than the diameter of the rear positioning part 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. That is, the inner side of the positioning groove 21 has a step, and correspondingly, the outer side of the spacer ring 4 has a step. During the locking process between the fastener 3 and the tool holder 1, the step of the positioning groove 21 will axially compress the step of the spacer ring 4, thereby causing radial deformation of the rear ring body 42 of the spacer ring 4. Other structures in this embodiment are the same as in Embodiment 1, and will not be described further here.

[0051] Compared with example 1, since the axial extrusion force of the stepped position is increased in the present example, the extrusion effect is better, so that the spacer ring 4 can be more easily deformed radially, but the setting of the step will increase the manufacturing difficulty of the tool bit 2 and the spacer ring 4.

[0052]

Example 3

[0053] In the present example, as shown in Figure 8 the outer side surface of the current ring body 41 preliminarily contacts 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, and the tool shank 1 is also provided with an annular boss 14 which protrudes forward from the front end surface of the tool shank 1, when the fastener 3 is completely locked with the tool shank 1, the annular boss 14 extrudes the spacer ring 4 forward, and the annular boss 14 is embedded in the positioning groove 21. During the locking process of the fastener 3 and the tool shank 1, the annular boss 14 contacts the rear end surface of the spacer ring 4 and extrudes the spacer ring 4, so that the spacer ring 4 is deformed radially. In addition, since the annular boss 14 is embedded in the positioning groove 21 to occupy part of the axial space of the positioning groove 21, the axial space occupied by the spacer ring 4 is compressed, so that sufficient radial deformation of the spacer ring 4 can be ensured. The other structures of the present example are the same as those of example 1, and will not be described here.

[0054] Compared with example 1, since the axial extrusion force of the stepped position is increased in the present example, the extrusion effect is better, so that the spacer ring 4 can be more easily deformed radially, but the setting of the step will increase the manufacturing difficulty of the tool bit 2 and the spacer ring 4.

Claims

1. A split tool, comprising: The tool holder, the tool head and the fastener, the fastener is locked with the tool holder to fix the tool head to the tool holder, characterized in that: the machining tool further comprises: a spacer ring, the spacer ring is sleeved on the fastener and at least a part of the spacer ring is located in the tool head, when the fastener is completely locked with the tool holder, the tool holder and the tool head press the spacer ring in the axial direction to make the spacer ring deformed in the radial direction, and the outer side surface and the inner side surface of the spacer ring are interference fit with the tool head and the fastener respectively.

2. The split tool according to claim 1, characterized in that: The tool head is provided with a positioning groove for accommodating the spacer ring, the positioning groove is sequentially provided with a front positioning part and a rear positioning part from front to back, the front positioning part is a circular truncated cone slot with narrow front and wide back, and the rear positioning part is a cylindrical slot; the spacer ring is sequentially provided with a front ring body and a rear ring body from front to back, the front ring body is a circular truncated cone body with narrow front and wide back, and the rear ring body is a cylindrical body, when the fastener is completely locked with the tool holder, 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.

3. The split tool according to claim 2, characterized in that: 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.

4. The split tool according to claim 2, characterized in that: 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 is initially contacted with the inner side surface of the front positioning part, there is a gap between the front end surface of the spacer ring and the front end surface 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 gap width between the front end surface of the spacer ring and the front end surface of the positioning groove.

5. The split tool insert according to claim 2, wherein: The tool head is further provided with a through hole and a recessed groove, the positioning groove, the through hole and the recessed groove are sequentially communicated from back to front; the fastener is a screw, the screw is sequentially provided with a nail head, a mandrel and a screw rod from front to back, the nail head is located in the recessed groove, the mandrel sequentially passes through the through hole and the spacer ring from front to back; the tool holder is provided with a screw hole, and the screw rod is screwed with the screw hole.

6. The split tool according to claim 5, characterized in that: The tool head is further provided with a plurality of tooth parts, and the plurality of tooth parts are uniformly arranged in a circumferential array around the axis of the machining tool; the nail head is a polygonal column, the recessed groove is a polygonal column groove matched with the nail head, the number of the tooth parts is consistent with the number of the inner side surfaces of the recessed groove, and the cutting edges of the plurality of tooth parts are respectively arranged opposite to the plurality of inner side surfaces of the recessed groove in the radial direction.

7. The split tool according to claim 6, characterized in that: The inner side surface of the recessed groove is provided with a water passing recess, and the water passing recess is recessed outward in the radial direction.

8. The split tool insert according to claim 5, wherein: The tool holder is further provided with a mandrel hole, the mandrel hole is recessed from the front end surface of the tool holder, the mandrel hole and the screw hole are communicated front and back, and the diameter of the mandrel hole is greater than the diameter of the screw hole, the rear end of the mandrel is embedded in the mandrel hole.

9. The split tool according to claim 8, characterized in that: The machining tool further comprises: a resilient ring, the side surface of the mandrel is provided with an outer annular groove, the inner side surface of the spacer ring is provided with an inner annular groove, and the resilient ring is sleeved on the outer annular groove and located in the inner annular groove.

10. The split tool insert according to claim 1, wherein: The spacer ring is formed of polyether ether ketone containing carbon fibers.

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