Cutting knife, machining equipment and machine tool

Abstract

The utility model relates to the technical field of cutting knives, and discloses a cutting knife, processing equipment and a machine tool, the cutting knife is characterized in that a blade body is arranged in a cross section perpendicular to an axis, two front knife faces and two rear knife faces form a centrosymmetric quadrangle, adjacent front knife faces and rear knife faces form cutting blades, and the cutting blades are arranged in the quadrangle and on the same side of the axis; an included angle alpha is formed between the rear tool face and the machining reference face of the rear tool face, the included angle alpha is larger than or equal to 0.5 degree and smaller than or equal to 20 degrees, and the blade body is provided with two machining reference faces which are symmetrically located on the two sides of the axis of the blade body and parallel to the axis. By means of the structure, the cutter does not need to machine a roll angle in the machining process, the one-way cutting edge is tightly attached to the machining arc face, residues on the machined face are reduced, machining quality is improved, and high-precision machining is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cutting knife technical field, especially a kind of cutting knife, processing equipment and machine tool. BACKGROUND

[0002] At present, for the processing of honeycomb material, the existing technology is usually processed by bidirectional blade cutting knife, which needs to apply side rake angle when processing. There is a certain gap between bidirectional blade cutting knife and the surface to be processed, and there is residual on the processed surface after processing, which cannot be processed in place at one time and also has processing quality problems. SUMMARY

[0003] The utility model aims at providing a kind of cutting knife, processing equipment and machine tool, which can reduce the residual of the processed surface and improve the processing quality.

[0004] To achieve the above purpose, the utility model provides a kind of cutting knife, comprising:

[0005] handle and blade body connected in turn from back to front along axial direction, the blade body has two cutting edges, two opposite front cutting edges and two opposite rear cutting edges, adjacent front cutting edge and rear cutting edge form cutting edge, in the cross section perpendicular to axis, two front cutting edges and two rear cutting edges form central symmetric quadrilateral, and the included angle of front cutting edge and rear cutting edge forming cutting edge is acute angle;

[0006] In the quadrilateral and on the same side of axis, rear cutting edge has included angle α relative to the processing reference surface of rear cutting edge, and it satisfies: 0.5 ° ≤ α ≤ 20 °, the blade body has two processing reference surfaces, and two processing reference surfaces are symmetrically located on both sides of the axis of the blade body and parallel to the axis.

[0007] In some embodiments of the utility model:

[0008] The outer circumferential surface of the handle has retreat knife concave position symmetrically arranged on both sides of the axis, the retreat knife concave position has retreat knife starting line towards one side of the blade body, the retreat knife starting line is parallel to the processing reference surface, and the retreat knife starting line is located on the end surface of the handle towards the blade body.

[0009] In some embodiments of the utility model:

[0010] The retreat knife concave position is in the form of circular arc, the included angle of front cutting edge and rear cutting edge forming cutting edge is γ, and it satisfies: 15 ° ≤ γ ≤ 45 °.

[0011] In some embodiments of the utility model:

[0012] The shank comprises a clamping section and a fastening section, the clamping section is cylindrical, a flat position is arranged on the outer circumferential surface of the clamping section, one end of the clamping section is connected with the blade body, the other end of the clamping section is connected with the fastening section, and the connection part of the clamping section and the fastening section is circularly arc transitioned.

[0013] In some embodiments of the utility model,

[0014] The end surface of the clamping section, on which the fastening section is connected, is a positioning surface, and the positioning surface is used for positioning the cutting knife at a preset clamping position in the machining equipment.

[0015] In some embodiments of the utility model,

[0016] The length of the blade body along the central axis is 10mm to 135mm, the thickness of the blade body is 0.5mm to 5mm, and the material of the blade body comprises carbon tool steel, alloy tool steel, high-speed steel or hard alloy.

[0017] In some embodiments of the utility model,

[0018] The end of the blade body, which is away from the shank, has a blade tip part;

[0019] In a first projection plane perpendicular to the machining reference surface, the blade tip angle of the blade tip part is β, and 45°≤β≤90° is satisfied; in a second projection plane parallel to the machining reference surface, the included angle of the two outermost contour lines of the blade tip part is a blade tip secondary angle, the blade tip secondary angle is 80 to 100°, and the included angle of the two outermost contour lines of the blade body is 5° to 20°.

[0020] In some embodiments of the utility model,

[0021] The length of the blade tip part along the central axis of the blade body is L mm, and the thickness of the blade body is t mm, and 80%*t≤L≤90%*t is satisfied.

[0022] The utility model also provides a machining equipment comprising the cutting knife.

[0023] The utility model also provides a machine tool comprising the machining equipment.

[0024] The utility model provides a cutting knife, a machining equipment and a machine tool, compared with the prior art, and has the beneficial effects that:

[0025] The utility model discloses a cutting knife, including handle and blade body, the blade body is in the cross section perpendicular to the axis, two rake faces and two relief surfaces form the central symmetry quadrilateral, and the adjacent rake face and relief surface form the cutting edge, in the quadrilateral and on the same side of the axis, the relief surface has the included angle alpha to the machining reference surface of the relief surface, satisfy: 0.5 DEG <= alpha <= 20 DEG, the blade body has two machining reference surfaces, and two machining reference surfaces are symmetrically located on the both sides of the axis of the blade body and all with the axis parallel. The utility model discloses a cutting knife, including handle and blade body, the blade body is in the cross section perpendicular to the axis, two rake faces and two relief surfaces form the central symmetry quadrilateral, and the adjacent rake face and relief surface form the cutting edge, in the quadrilateral and on the same side of the axis, the relief surface has the included angle alpha to the machining reference surface of the relief surface, satisfy: 0.5 DEG <= alpha <= 20 DEG, the blade body has two machining reference surfaces, and two machining reference surfaces are symmetrically located on the both sides of the axis of the blade body and all with the axis parallel.

[0026] The utility model discloses a cutting knife, including handle and blade body, the blade body is in the cross section perpendicular to the axis, two rake faces and two relief surfaces form the central symmetry quadrilateral, and the adjacent rake face and relief surface form the cutting edge, in the quadrilateral and on the same side of the axis, the relief surface has the included angle alpha to the machining reference surface of the relief surface, satisfy: 0.5 DEG <= alpha <= 20 DEG, the blade body has two machining reference surfaces, and two machining reference surfaces are symmetrically located on the both sides of the axis of the blade body and all with the axis parallel.

[0027] The utility model discloses a cutting knife, including handle and blade body, the blade body is in the cross section perpendicular to the axis, two rake faces and two relief surfaces form the central symmetry quadrilateral, and the adjacent rake face and relief surface form the cutting edge, in the quadrilateral and on the same side of the axis, the relief surface has the included angle alpha to the machining reference surface of the relief surface, satisfy: 0.5 DEG <= alpha <= 20 DEG, the blade body has two machining reference surfaces, and two machining reference surfaces are symmetrically located on the both sides of the axis of the blade body and all with the axis parallel. ACCORDING TO THE DRAWINGS

[0028] Figure 1 It is the structure schematic diagram of cutting knife of the utility model embodiment.

[0029] Figure 2 It is the structure schematic diagram of the blade body of cutting knife of the utility model embodiment removes the allowance.

[0030] Figure 3 It is the schematic diagram that the cutting knife of the utility model embodiment is in the cross section perpendicular to the blade body axis, and the relief surface has the included angle to the machining reference surface.

[0031] Figure 4 It is Figure 1 The enlarged diagram of A in the figure.

[0032] Figure 5 It is Figure 1 The enlarged diagram of C in the figure.

[0033] Figure 6a It is the front view of cutting knife of the utility model embodiment.

[0034] Figure 6b It is Figure 6a The enlarged diagram of the blade tip of the figure.

[0035] Figure 7 is Figure 6a is a sectional view at B-B in figure

[0036] Figure 8 is a side view of the cutting knife according to an embodiment of the present utility model.

[0037] Figure 9 is a schematic view of the cutting knife according to another embodiment of the present utility model.

[0038] Figure 10 is a cutting knife with a mirror image of the blade structure. Figure 1

[0039] Figure 11 is a force analysis diagram of the bidirectional blade cutting knife in the prior art.

[0040] Figure 12 is a schematic view of the relationship between the cutting angle θ and the blade surface angle β and the nose angle δ of the cutting tool.

[0041] Figure 13 is a schematic view of the effective action area S of the blade surface and the workpiece 300 being cut during the cutting process.

[0042] Figure 14 is a force analysis diagram of the cutting knife according to an embodiment of the present utility model.

[0043] Figure 15 is a schematic view of the cutting process of the cutting knife according to an embodiment of the present utility model.

[0044] In the figure, 100 is a unidirectional blade cutting knife; 200 is a bidirectional blade cutting knife; 300 is a workpiece being cut; 400 is a feed direction.

[0045] 1, shank; 2, blade body; 11, clamping section; 12, fastening section; 111, tool withdrawal recess; 112, connecting surface; 113, reference line; 114, flat position; 115, positioning surface; 21, rake face; 22, relief face; 221, machining reference surface; 23, nose portion. DETAILED DESCRIPTION

[0046] The specific embodiments of the present utility model will be described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0047] ​In the description of the utility model, it is necessary to explain that, the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the indicated device or element to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the utility model, it is necessary to explain that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0049] In addition, in the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more than two.

[0050] For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0051] Please refer to Figure 1 and Figure 3 The utility model discloses a cutting knife 100, including: handle 1 and blade body 2, handle 1 and blade body 2 are connected in sequence from back to front along the axial direction. In the cutting knife, there are two cutting edges, two opposite front cutting edges 21 and two opposite rear cutting edges 22, adjacent front cutting edge 21 and rear cutting edge 22 form the cutting edge, the blade body 2 in the cross section perpendicular to the axis, two front cutting edges 21 and two rear cutting edges 22 form the central symmetry quadrilateral, can simplify the structure of blade body 2, and the processing stability and efficiency are also better, also optimize the manufacturing and use process. The included angle α of the front cutting edge 21 and the rear cutting edge 22 forming the cutting edge is acute. The foregoing structure makes the cutting knife of the application form a one-way blade cutting knife, which can only cut in one direction during cutting. If reverse cutting is required, the cutting knife needs to be replaced, and the cutting edges of the two cutting knives before and after replacement are mirror image.

[0052] On the same side of the axis within the quadrilateral, the relief surface 22 has an included angle α with the machining reference surface 221 of the relief surface 22, satisfying: 0.5°≤α≤20°. The blade body 2 has two machining reference surfaces 221, which are symmetrically located on both sides of the axis of the blade body 2 and are parallel to the axis. During cutting, the setting of the included angle α makes the single-blade cutting tool not need to process the side rake angle during processing, so that the single-blade cutting tool is closely attached to the machining camber surface, thereby reducing the residues of the machined surface. During processing, not only a large amount of material can be efficiently removed, but also the relief surface will not produce indentation on the workpiece due to the included angle α. In the fine processing link, the shape of the material can also be finely trimmed. Especially when processing complex structures such as sharp corners that are difficult to achieve by traditional methods, the single-blade cutting tool exhibits superior performance, ensuring good quality of the machined surface, improving the processing quality, and realizing high-precision processing.

[0053] In an embodiment provided in the present application, the cutting tool is connected with an ultrasonic machining device, and the blade body 2 vibrates due to ultrasonic frequency to cut the honeycomb material, wherein the honeycomb material includes metal honeycomb material, plastic honeycomb material, paper honeycomb material, gypsum honeycomb material, etc.

[0054] In the present embodiment, referring to Figure 3 , the cutting edge of the blade body 2 is provided in the shape of a similar foot triangle, so that only one-way processing can be performed. In specific implementation, mirror image blade body 2 structures can be provided, such as Figure 1 and Figure 10 are cutting tools with mirror image blade bodies 2 cutting in opposite directions, and Figure 1 and Figure 10 are two single-blade cutting tools, which can be selected according to different processing needs. Please refer to FIGS. Figure 1 and 10 .

[0055] By limiting the angle range of α, the single-blade cutting tool 100 does not need to process the side rake angle during processing, so that the single-blade cutting edge is closely attached to the machining camber surface, thereby reducing the residues of the machined surface, improving the processing quality, and realizing high-precision processing. At the same time, the structural strength of the single-blade cutting tool 100 can be improved, and the amplitude and frequency load bearing capacity of the ultrasonic wave can be effectively enhanced.

[0056] In the prior art, such as Figures 11 to 13 , the tool is usually a double-blade cutting tool 200, and the cross-sectional shape of the cutting edge is similar to an isosceles triangular structure. During processing, a side rake angle needs to be applied, which causes the double-blade cutting tool 200 to have a certain gap with the machined surface when processing the aramid paper honeycomb camber surface, and the machined surface cannot be processed in place at one time.

[0057] During cutting of the tool, please refer to Figure 11 , the feed force Ff is the resistance F generated by the workpiece 300 being cut L and the frictional resistance F of the cutting tool and the workpiece 300 being cut U the resultant force in the feed direction 400:

[0058]

[0059] (1) where please refer to Figure 12 schematic diagram of only one side of the cutting edge of the bidirectional cutting tool 200, θ is the cutting angle of the cutting tool, the relationship between the cutting angle θ and the edge angle β of the cutting tool, the relationship between the cutting angle θ and the nose angle δ, θ is the cutting angle, that is, the angle between the plane of the material being cut and the cutting tool at the cutting edge, the plane in which the edge angle β is located is perpendicular to the two edges, and the included angle between the two edges in this plane is the edge angle β:

[0060]

[0061] Assuming that the equivalent deformation resistance of the workpiece 300 being cut is σ, when the workpiece 300 being cut is deformed plastically, the deformation resistance F of the cutting tool L is:

[0062]

[0063] (3) where please refer to Figure 13 , S is the effective action area of the cutting edge and the workpiece 300 being cut during the cutting process.

[0064] When the cutting depth of the cutting tool is a p , then:

[0065]

[0066] (4) where H is the thickness of the cutting edge, and the deformation resistance F of the cutting tool during the cutting process can be obtained from equation (3) and equation (4): L

[0067]

[0068] During the cutting process, the frictional resistance F generated by the cutting tool and the workpiece 300 being cut is: U

[0069]

[0070] (6) where μ is the friction coefficient of the cutting tool and the workpiece 300 being cut during the cutting process.

[0071] Therefore, the feed force F of the cutting tool f is a function of the nose angle δ, the thickness H of the cutting edge, the edge angle β, and the cutting angle θ, and the function is: ​​

[0072]

[0073] Regarding the influence of the rake angle β on the feed force: when the rake angle β increases, the cutting angle θ also increases accordingly. According to formula (5), the deformation resistance F L increases with the increase of β, and increases with the increase of θ (μ is much smaller than 1), so the feed force F f increases with the increase of the rake angle β.

[0074] Regarding the influence of the tool thickness H on the feed force: when the tool thickness H increases, according to formula (3), the effective contact area S between the tool and the workpiece 300 also increases, so the deformation resistance F L also increases, so when the tool thickness H increases, the cutting feed force F f also increases.

[0075] In addition, when determining the tool rake angle and tool thickness parameters, the overall strength of the tool should also be considered, and the values of the rake angle β and the tool thickness H should not be too small, so as to take into account the tool strength and the small cutting feed force during tool cutting. Therefore, appropriate rake angle and tool thickness should be selected.

[0076] Since the cross section of the cutting edge of the traditional bidirectional blade cutting tool 200 is in the shape of an isosceles triangle, both sides of the cutting edge have a certain angle with the tool axis. Referring to Figure 11 , the decomposition of the friction force F U generated during cutting can be known that the friction force F U can be decomposed into the force F U1 in the axial direction of the tool (the same line as the feed direction 400) and the force F U2 in the radial direction of the tool. The axial component F U1 will increase the cutting resistance during cutting, that is, the cutting feed force needs to be increased, and the radial component F U2 will generate a certain torsion in the radial direction of the tool, affecting the strength of the tool during cutting. Therefore, the tool needs to be applied with a side rake angle, but after increasing the side rake angle, there will be a certain gap between the tool and the surface to be machined during the machining of the arched surface of the aramid paper honeycomb, and the machined surface will not be machined in place once. For example, if the side rake angle is not applied, the cutting tool will directly extrude the material, causing the retained material to produce indentation. Based on this, it is difficult to machine complex structures such as sharp corners and arched surfaces in the prior art, and problems such as collapse, tearing, and fiber fluffing of aramid paper honeycomb materials are also prone to occur.

[0077] The unidirectional blade cutting tool 100 of the present embodiment, please refer to Figure 14 and Figure 15The cutting edge has a near-right-angled triangular structure, and the flank face 22 of the tool has a certain inclination angle α. When the inclination angle is small, since the cutting angle is almost parallel to the cutting surface of the tool, there is no need to increase the side tilt angle during the cutting process. This allows the tool to fit closely with the workpiece's curved surface, thereby reducing the residue on the workpiece surface. This enables the machining of complex shapes such as sharp corners and curved surfaces, achieving high-precision machining of workpiece curved surfaces. In addition, applying a certain inclination angle α to the flank face 22 reduces the effective contact area between it and the workpiece during the cutting process, thus reducing the frictional force F. U It will also decrease, and F U The force F in the radial direction U2 The pressure on the workpiece will be transformed into a supporting force on the cutting tool, which will help reduce the extrusion deformation of the cutting tool on the processed surface, reduce the occurrence of problems such as collapse, tearing, and fiber fuzzing of the paper honeycomb material, and thus improve the processing quality of the workpiece.

[0078] Please refer to Figure 1 , Figure 2 and Figure 4 At least a portion of the tool holder 1 is cylindrical. The outer circumferential surface of the tool holder 1 has retraction recesses 111 symmetrically arranged on both sides of the axis. The retraction recesses 111 have a retraction starting line on the side facing the cutting edge. The retraction starting line is parallel to the machining reference surface 221 and is located on the end face of the tool holder 1 facing the cutting edge 2.

[0079] Since the cutting tool is formed from a cylindrical body into a cutting tool with a shank and a cutting edge, during the tool machining process, it is necessary to remove excess material first, and to remove the machining allowance gradually from front to back. At the connection between the cutting edge 2 and the shank 1, the tool gradually retracts backward, causing it to move further away from the cylindrical body. Therefore, the retraction starting line is located at the connection between the shank and the cutting edge, and gradually recesses backward, forming a retraction recess. That is, the retraction starting line is located on the end face of the shank 1 facing the cutting edge 2. This then forms... Figure 2 The structure shown has a retraction recess 111, that is, the retraction recess 111 is formed at the connection between the tool holder and the cutting edge, and a columnar structure for machining the cutting edge is shown. The cross-section of this structure can be formed as follows: Figure 3 The structure includes a machining reference surface 221, such as a rectangle. In the cross-section, the outlines of the rake faces are the shorter sides of the rectangle, and the lines of the flank faces are the projection lines of the machining reference surface 221. Alternatively, the outlines of the rake faces in the cross-section can be arc-shaped, and the lines of the flank faces can be the projection lines of the machining reference surface 221. When machining the flank face, if the flank face is machined on the basis of a rectangle, the outline of the longer side of the rectangle is the theoretical surface for machining the flank face, i.e., the machining reference surface in this application.

[0080] It should be noted that the face containing the long side of the rectangle after removing the allowance may not coincide with the theoretical machining reference face, but there will be a theoretically invisible machining reference face for the back face. Additionally,Figure 2 The middle structure is only used for exemplarily illustrating the relief recess and the column structure for forming the blade body, and is not limited.

[0081] In one embodiment of the present application, in combination with the foregoing and with reference to Figure 1 , the end face of one end of the shank 1 is denoted as a connecting face 112, the connecting face 112 is perpendicular to the central axis of the shank 1, the relief recess 111 extends to the connecting face 112, and the intersection line of the relief recess 111 and the connecting face 112 is denoted as a reference line 113. The reference line is the aforementioned relief starting line, and the reference line 113 is parallel to the machining reference face or is located in the machining reference face.

[0082] The shank 1 can be clamped by the one-way blade cutting knife 100 and connected to a driving device for driving the shank 1 to move, that is, connected to a toggle lever, so as to transmit ultrasonic waves to the blade body 2.

[0083] Please refer to Figures 3 to 7 , the blade body 2 is arranged on the connecting face 112, the blade body 2 is a central-symmetrical quadrilateral in the cross section parallel to the connecting face 112, the blade body 2 has a rake face 21 and a relief face 22 forming a cutting edge, and in the projection plane perpendicular to the axis of the cutting knife, the reference line 113 and the relief face 22 are oppositely arranged in the projection plane and the projections of the two have an included angle α, which satisfies: 0.5°≤α≤20°.

[0084] In some embodiments, the shank 1 comprises a clamping section 11 and a fastening section 12, the clamping section 11 is in a cylindrical shape, the outer circumferential surface of the clamping section 11 is provided with a flat position 114, the connecting face 112 is the end face of one end of the clamping section 11, one end of the clamping section 11 is connected to the blade body 2, the other end of the clamping section 11 is connected to the fastening section 12, and the connection between the clamping section 11 and the fastening section 12 is arc transition.

[0085] The flat position 114 forms a plane, which facilitates the clamping of the one-way blade cutting knife 100. In this embodiment, two flat positions 114 are provided, and the two flat positions 114 are mirror-symmetrically arranged.

[0086] The fastening section 12 is provided with threads, and the fastening section 12 is used for being connected to the toggle lever.

[0087] The relief recess 111 is in a circular arc shape. In this embodiment, two relief recesses 111 are provided, and the two relief recesses 111 are mirror-symmetrically arranged, and the flat position 114 and the relief recess 111 are correspondingly arranged, and the flat position 114 extends to one end of the relief recess 111 away from the reference line.

[0088] The connection between the clamping section 11 and the rake face 21 of the blade body 2 is arc transition, which can provide strength support for the blade body 2.

[0089] Please refer to Figure 7The end surface of the clamping section 11, on which the fastening section 12 is connected, is a positioning surface 115, which is used to position the cutting knife in a preset clamping position in the machining equipment, that is, after the knife is changed, the positioning surface 115 can position the knife tip part 23 on the blade body 2 of each cutting knife to be at the same height in the machining equipment. The positioning surface 115 is perpendicular to the central axis of the knife handle 1, and the positioning surface 115 can conduct ultrasonic waves. When the knife is installed, the knife tip part 23 at the end of the blade body 2 away from the knife handle 1 can be kept at a preset position.

[0090] The length of the blade body 2 along the central axis thereof ranges from 10 mm to 135 mm, and the thickness of the blade body 2 ranges from 0.5 mm to 5 mm. When this range is met, the strength of the one-way blade cutting knife 100 as a whole can be improved, and the amplitude and frequency load bearing capacity of the ultrasonic waves can be effectively enhanced.

[0091] Please refer to Figure 3 , Figure 6a and Figure 6b The end of the blade body 2 away from the knife handle 1 has a knife tip part 23; the knife tip angle of the knife tip part 23 in the first projection plane perpendicular to the machining reference surface 221, or in the projection of the knife tip part 23 in the plane perpendicular to the reference line 113, is β, which satisfies: 45°≤β≤90°, and in other embodiments, 50°≤β≤65°. In the second projection plane parallel to the machining reference surface, the included angle of the two outermost profile lines of the knife tip part is a knife tip secondary angle, and the knife tip secondary angle φ is 80°-100°, and in other embodiments, the knife tip secondary angle is 90°, and at the same time, the included angle ω of the two outermost profile lines of the blade body is 5°-20°, and in other embodiments, the included angle of the two outermost profile lines of the blade body is 8.5°. When this range is met, the side surface of the cutting knife on the side where the material is removed bears a larger friction force, and the side surface of the cutting knife on the side where the material is retained bears a smaller friction force, and the one-way blade cutting knife 100 has a better cutting effect.

[0092] The provision of the knife tip part 23 can facilitate the cutting of the one-way blade cutting knife 100 into the material, enhance the sharpness of the one-way blade cutting knife 100, and improve the adaptability under different working conditions.

[0093] The length of the knife tip part 23 along the central axis of the blade body 2 is L mm, and the thickness of the blade body 2 is t mm, which satisfies: 80%*t≤L≤90%*t. When this range is met, the strength of the one-way blade cutting knife 100 as a whole can be improved, and the amplitude and frequency load bearing capacity of the ultrasonic waves can be effectively enhanced.

[0094] The thickness of the knife tip part 23 and other parts of the blade body 2 is the same. In an embodiment of the present application, t is 2.7. The length of the blade body 2 along the central axis thereof is 103, and L is 2.38.

[0095] The cutting knife provided in the embodiments of the present application has a constant angle between the rake face 21 and the relief face 22, the included angle between the rake face 21 and the relief face 22 is γ, and 15°≤γ≤45° is satisfied, and the material of the blade body 2 comprises carbon tool steel, alloy tool steel, high-speed steel or hard alloy. In some embodiments, the high-speed steel and the hard alloy have excellent toughness and sufficient strength, which can reduce tool wear, reduce cutting force, improve the surface quality of the machined part, and the like, and ensure the durability and reliability under long-time use. Preferably, 30°≤γ≤35°, and the unidirectional blade cutting knife 100 has a relatively optimal cutting effect.

[0096] In the embodiments provided in the present application, in different cutting tasks, the specific cutting edge length and angle can be adapted accordingly (according to the material thickness, the tool with different blade lengths is adapted), which ensures the wide applicability and operation efficiency of the cutting knife.

[0097] The embodiments also provide a machining device comprising the cutting knife 100, and the machining device is an ultrasonic machining device, the cutting knife 100 is connected through a horn, and in the machining process, the side rake angle is not needed, the unidirectional cutting edge is closely attached to the machining camber surface, so that the residual of the machined surface is reduced, the machining quality is improved, and high-precision machining is realized.

[0098] The embodiments also provide a machine tool comprising the machining device, and in the machining process, the side rake angle is not needed, the unidirectional cutting edge is closely attached to the machining camber surface, so that the residual of the machined surface is reduced, the machining quality is improved, and high-precision machining is realized.

[0099] The above only describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and replacements can be made, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A cutting knife characterized in that, The cutting tool comprises: a shank and a blade body connected in sequence along an axial direction from back to front, the blade body having two cutting edges, two opposite rake faces and two opposite flank faces, the adjacent rake face and flank face forming the cutting edge, the two rake faces and the two flank faces forming a central symmetric quadrilateral in a cross section perpendicular to the axial direction, and the included angle of the rake face and the flank face forming the cutting edge being an acute angle; the flank face has an included angle α with respect to a machining reference surface of the flank face on the same side of the axial direction in the quadrilateral, satisfying 0.5°≤α≤20°, and the blade body has two machining reference surfaces symmetrically located on both sides of the axial direction of the blade body and parallel to the axial direction.

2. The cutting tool according to claim 1, wherein: the outer circumferential surface of the shank has retreat recesses symmetrically arranged on both sides of the axial direction, the retreat recess has a retreat starting line on the side facing the blade body, the retreat starting line is parallel to the machining reference surface, and the retreat starting line is located on the end surface of the shank facing the blade body.

3. The cutting tool according to claim 2, wherein: the retreat recess is in the shape of a circular arc, the included angle of the rake face and the flank face forming the cutting edge is γ, satisfying 15°≤γ≤45°.

4. The cutting tool according to claim 1, wherein: the shank comprises a clamping section and a fastening section, the clamping section is in the shape of a cylinder, the outer circumferential surface of the clamping section is provided with a flat portion, one end of the clamping section is connected to the blade body, the other end of the clamping section is connected to the fastening section, and the connection between the clamping section and the fastening section is circularly arc-shaped.

5. The cutting tool according to claim 4, wherein: the end surface of the clamping section on which the fastening section is connected is a positioning surface, and the positioning surface is used for positioning the cutting tool in a preset clamping position in a machining device.

6. The cutting tool according to claim 1, wherein: the length of the blade body along the central axis is 10mm-135mm, the thickness of the blade body is 0.5mm-5mm, and the material of the blade body comprises carbon tool steel, alloy tool steel, high-speed steel or hard alloy.

7. The cutting tool according to claim 1, wherein: the blade body has a tip portion on the end away from the shank; in a first projection plane perpendicular to the machining reference surface, the angle of the tip of the tip portion is β, satisfying 45°≤β≤90°; in a second projection plane parallel to the machining reference surface, the included angle of the two outermost profile lines of the tip portion is a tip secondary angle, the tip secondary angle is 80°-100°, and the included angle of the two outermost profile lines of the blade body is 5°-20°.

8. The cutting tool according to claim 7, wherein: the length of the tip portion along the central axis of the blade body is L mm, and the thickness of the blade body is t mm, satisfying 80%*t≤L≤90%*t.

9. A processing apparatus characterized by comprising: The machining device comprises the cutting tool according to any one of claims 1-8.

10. A machine tool, characterized by The machining device comprises the cutting tool according to claim 9.

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