Stainless steel cutting blade

Abstract

The utility model discloses a stainless steel cutting blade which comprises a blade body and a cutting unit, the cutting unit comprises a cutting edge, an arc edge, a rake face, a chip breaking table and heat dissipation holes, the rake face and the chip breaking table intersect to form a chip breaking groove, and the heat dissipation holes are formed in the chip breaking groove. By arranging the heat dissipation holes, the heat dissipation capability of cutting is improved, and the temperature of the blade during machining is reduced. In addition, the structure of the conical chip breaking table is adopted, scrap iron can be machined and guided to be removed in a narrow space, and the surface of a workpiece is effectively prevented from being damaged by the scrap iron. Due to the adoption of the structure of the arc edge and the front angle of the cutting edge, the sharpness of the blade can be kept, good strength can be provided for strengthening the cutting edge, and the problem that the service life of the blade is short due to low chip removal capacity and high cutting heat of the existing stainless steel cutting blade is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cemented carbide cutting blades, and more specifically, to a stainless steel cutting blade. Background Art

[0002] During the processing of stainless steel products, when machining the surface roughness or internal holes, it is necessary to strictly control within a very small range. Any machining defects, such as tool marks, vibration marks, etc., will affect the aesthetics of the products. Due to some performance characteristics of stainless steel itself, the following difficulties exist in processing:

[0003] (1) Stainless steel has a high coefficient of thermal expansion, and the heat generated during the machining process is likely to cause the workpiece to deform.

[0004] (2) In the internal hole thread machining, the cutting force is concentrated on the small contact surface of the threading tool, which is likely to cause tool damage or poor surface roughness of the thread.

[0005] (3) The chips of stainless steel have strong toughness and are prone to curling and winding around the tool, resulting in difficult chip evacuation.

[0006] Therefore, when the cutting tool cuts stainless steel, on the premise of maintaining the cutting strength of the blade, it is also necessary to meet the requirements of reducing heat generation and timely chip breaking and chip evacuation.

[0007] In CN202223533093.3, a finishing cutting blade for stainless steel parts is disclosed. The cutting unit at the apex angle of the blade body includes an arc edge, a cutting edge and a chip breaker platform. The arc edge and the cutting edge extend towards the positioning center hole to form a rake face, and a chip breaking groove is provided on the rake face. The chip breaking groove is successively a rake face, a wedge-shaped chip breaker platform and a V-shaped chip breaker platform from the arc edge to the positioning center hole. This patent makes the chip breaking, chip holding and chip evacuation of the workpiece more smooth during the machining cutting process through the combination of the wedge-shaped chip breaker platform and the V-shaped chip breaker platform, and combines with a reasonable cutting edge rake angle and edge inclination angle structure design to reduce the deformation of the cutting layer and the chip friction resistance, making the cutting process easy and reducing heat generation. However, the design of its chip breaking structure has insufficient chip curling degree at small cutting depths, resulting in chip winding around the blade or the workpiece; on the other hand, at large cutting depths, if the heat generated during cutting cannot be reduced, it will cause the blade to crack thermally and fail to reach the required surface finish. Summary of the Utility Model

[0008] The technical problem to be solved by the utility model is to provide a stainless steel cutting blade aiming at the deficiencies of low chip evacuation ability and high cutting heat of the existing ones, which lead to low blade life.

[0009] The purpose of the utility model is realized by the following technical solutions:

[0010] A stainless-steel cutting blade, comprising a blade body and a cutting unit provided on the blade body; the blade body is provided with a positioning center hole, and the blade body includes an upper positioning surface, a lower positioning surface, and a plurality of side surfaces connecting the upper positioning surface and the lower positioning surface. The side surfaces are connected by arc surfaces, and the side surfaces intersect with the upper positioning surface to form a cutting edge, and the arc surface intersects with the upper positioning surface to form an arc edge. The cutting unit includes a cutting edge, an arc edge, a rake face, a chip breaker platform, and cooling holes. The rake face and the chip breaker platform intersect to form a chip-breaking groove, and cooling holes are provided on the rake face.

[0011] Further, the rake face includes a rake face of the arc edge and a rake face of the cutting edge. The rake angle α between the rake face of the arc edge and the upper positioning surface is 10° - 20°, and the rake angle γ between the rake face of the cutting edge and the upper positioning surface is 10° - 20°. Preferably, the rake angle α between the rake face of the arc edge and the upper positioning surface is 14°.

[0012] Further, the rake angle γ of the rake face of the cutting edge is a variable angle, which gradually changes from the tangential connection of the cutting edge and the arc edge to the middle of the cutting edge, following the processing principle of "sharp for small cutting depths and blunt for large cutting depths".

[0013] Further, the chip breaker platform includes an arc surface and side inclined surfaces connected to the rake face on both sides. The cross-section of the arc surface along the central connection line of the arc edge to the positioning hole is arc-shaped.

[0014] Further, the arc radius R1 of the cross-section of the arc surface is 5 - 12 mm. Preferably, the arc radius R1 of the arc surface is 8 mm.

[0015] Further, the angle between the side inclined surface and the bottom plane of the chip-breaking groove is 35 - 55°.

[0016] Further, a plurality of cooling holes are provided on the rake face, and the cooling holes are symmetrically distributed on both sides along the central connection line of the arc edge to the positioning hole.

[0017] Further, the depth of the cooling holes is 0.02 - 0.08 mm, and the radius R is 0.1 - 0.3 mm.

[0018] Further, the cutting depth and aperture of the cooling holes close to the arc edge are small, and the cutting depth and aperture of the cooling holes farther away from the arc edge are larger. The greater the cutting depth, the more heat is generated during cutting. As the cooling holes are enlarged, the heat dissipation time is faster.

[0019] Further, the vertical distance H2 between the bottom of the chip-breaking groove and the cutting edge is 0.05 - 0.25 mm; the vertical distance H1 between the cutting edge and the highest point of the chip breaker platform is 0.1 - 0.25 mm.

[0020] Furthermore, the included angle β between the side surface, the arc surface and the vertical plane where the cutting edge or the arc edge is located is 3 to 15°, reducing the cutting resistance during cutting. Preferably, the included angle β between the side surface, the arc surface and the vertical plane is 7°.

[0021] Furthermore, the horizontal distance L1 between the bottom of the chip breaker groove and the arc edge is 0.2 to 0.7 mm.

[0022] Furthermore, a plurality of cutting units are provided on the blade body.

[0023] Compared with the prior art, the beneficial effects are as follows:

[0024] In the present utility model, heat dissipation holes are provided on the blade body, improving the heat dissipation ability during cutting and reducing the temperature of the blade during processing. This can not only extend the service life of the blade but also effectively reduce the expansion and deformation of the stainless steel caused by the increase in the temperature of the workpiece during processing. In addition, the present utility model adopts the structure of an arc-shaped chip breaker platform, which can guide the chips to discharge along the arc surface during processing in a narrow space, effectively preventing the chips from damaging the surface of the workpiece. The structure of the arc edge and the rake angle of the cutting edge adopted by the present utility model can maintain the sharpness of the blade and provide good strength for the edge strengthening, meeting the processing requirements of chip evacuation with a small cutting depth and heat dissipation with a large cutting depth. Description of the Drawings

[0025] Figure 1 is a three-dimensional structure schematic diagram of the cutting blade;

[0026] Figure 2 is a partial enlarged view of the cutting unit

[0027] Figure 3 is a front view of a cutting blade;

[0028] Figure 4 is Figure 3 a cross-sectional view of the shown blade along the J-J line;

[0029] Figure 5 is Figure 3 a cross-sectional view of the shown blade along the L-L line;

[0030] Wherein, 1 is the blade body, 2 is the upper positioning surface, 3 is the lower positioning surface, 4 is the side surface, 5 is the arc surface, 6 is the cutting edge, 7 is the arc edge 7, 8 is the chip breaker platform, 9 is the heat dissipation hole, 10 is the rake face of the cutting edge, 11 is the rake face of the arc edge, and 20 is the positioning center hole. Detailed Embodiments

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that if there are directional indications (such as up, down, left, right, front, back) involved in the embodiments of the present utility model, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. If there are descriptions such as "first" and "second" involved in the embodiments of the present utility model, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, terms such as "installation", "provided with", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0034] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0035] Embodiment 1

[0036] This embodiment provides a stainless steel cutting blade, as Figures 1-2, including a blade body 1, the blade body 1 includes an upper positioning surface 2, a lower positioning surface 3 and three side surfaces 4 connecting the upper positioning surface 2 and the lower positioning surface 3, and adjacent side surfaces 4 are connected by an arc surface 5. The side surface 4 intersects with the upper positioning surface 2 to form a cutting edge 6, and the arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. A positioning center hole 20 is provided at the geometric center of the blade body 1. A cutting unit is provided at the vertex of the blade body 1, and the cutting unit includes a cutting edge 6, an arc edge 7, a rake face, a chip breaker 8 and a heat dissipation hole 9. The rake face and the chip breaker 8 form a chip breaking groove, and a plurality of heat dissipation holes 9 are provided on the rake face.

[0037] Embodiment 2

[0038] This embodiment provides a stainless steel cutting blade, such as Figures 1-2 , including a blade body 1, the blade body 1 includes an upper positioning surface 2, a lower positioning surface 3 and three side surfaces 4 connecting the upper positioning surface 2 and the lower positioning surface 3, and adjacent side surfaces 4 are connected by an arc surface 5. The side surface 4 intersects with the upper positioning surface 2 to form a cutting edge 6, and the arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. A positioning center hole 20 is provided at the geometric center of the blade body 1.

[0039] A cutting unit is provided at the vertex of the blade body 1, and the cutting unit includes a cutting edge 6, an arc edge 7, a rake face, a chip breaker 8 and a heat dissipation hole 9. The rake face includes an arc-edge rake face 11 and a cutting-edge rake face 10. The chip breaker 8 is in a conical shape and includes an arc surface and side inclined surfaces connected to the cutting-edge rake face 10 on both sides. One end of the arc surface is connected to the arc-edge rake face 11, and the other end is tangent to the upper positioning surface 2. The cross-section of the arc surface in the plane connecting the arc edge 7 and the center of the positioning hole is arc-shaped.

[0040] The arc-edge rake face 11, the cutting-edge rake face 10 and the chip breaker 8 form a chip breaking groove, and a plurality of heat dissipation holes 9 are provided in the chip breaking grooves on both sides of the chip breaker 8, and the heat dissipation holes 9 are symmetrically distributed on both sides of the line connecting the arc edge 7 and the center of the positioning hole.

[0041] Embodiment 3

[0042] This embodiment provides a stainless steel cutting blade, such as Figures 1-2 , including a blade body 1, the blade body 1 includes an upper positioning surface 2, a lower positioning surface 3 and three side surfaces 4 connecting the upper positioning surface 2 and the lower positioning surface 3, and adjacent side surfaces 4 are connected by an arc surface 5. The side surface 4 intersects with the upper positioning surface 2 to form a cutting edge 6, and the arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. A positioning center hole 20 is provided at the geometric center of the blade body 1.

[0043] A cutting unit is provided at the vertex angle of the blade body 1. The cutting unit includes a cutting edge 6, an arc edge 7, a rake face, a chip breaker 8, and a heat dissipation hole 9. As Figure 4 , the rake face includes an arc-edge rake face 11 and a cutting-edge rake face 10. The rake angle α between the arc-edge rake face 11 and the upper positioning surface 2 is 10° to 20°. As Figure 5 , the rake angle γ between the cutting-edge rake face 10 and the upper positioning surface 2 is 10° to 20°.

[0044] The chip breaker 8 is in a conical shape and includes an arc-shaped surface and side inclined surfaces connected to the cutting-edge rake face 10 on both sides. One end of the arc-shaped surface is connected to the arc-edge rake face 11, and the other end is tangent to the upper positioning surface 2. The cross-section of the arc-shaped surface along the center connection line of the arc edge 7 to the positioning hole is arc-shaped, and the arc radius R1 is 5 to 12 mm. The angle between the side inclined surface and the bottom plane of the chip-breaking groove is 45°.

[0045] The arc-edge rake face 11, the cutting-edge rake face 10, and the chip breaker 8 form a chip-breaking groove. A plurality of heat dissipation holes 9 are provided on the rake faces on both sides of the chip breaker 8, and the heat dissipation holes 9 are symmetrically distributed on both sides along the center connection line of the arc edge 7 to the positioning hole.

[0046] Embodiment 4

[0047] This embodiment provides a stainless steel cutting blade. As Figures 1-2 , it includes a blade body 1. The blade body 1 includes an upper positioning surface 2, a lower positioning surface 3, and three side surfaces 4 connecting the upper positioning surface 2 and the lower positioning surface 3. The adjacent side surfaces 4 are connected by an arc surface 5. The angle β between the side surface 4, the arc surface 5 and the vertical surface is 3 - 15°. The side surface 4 intersects with the upper positioning surface 2 to form a cutting edge 6, and the arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. A positioning center hole 20 is provided at the geometric center of the blade body 1.

[0048] A cutting unit is provided at the vertex angle of the blade body 1. The cutting unit includes a cutting edge 6, an arc edge 7, a rake face, a chip breaker 8, and a heat dissipation hole 9. As Figure 4 , the rake face includes an arc-edge rake face 11 and a cutting-edge rake face 10. The rake angle α between the arc-edge rake face 11 and the upper positioning surface 2 is 10° to 20°. As Figure 5 , the rake angle γ between the cutting-edge rake face 10 and the upper positioning surface 2 is 10° to 20°.

[0049] The chip breaker 8 is in a conical shape and includes an arc-shaped surface and side inclined surfaces connected to the cutting-edge rake face 10 on both sides. One end of the arc-shaped surface is connected to the arc-edge rake face 11, and the other end is tangent to the upper positioning surface 2. The cross-section of the arc-shaped surface along the center connection line of the arc edge 7 to the positioning hole is arc-shaped, and the arc radius R1 is 5 to 12 mm. The angle between the side inclined surface and the bottom plane of the chip-breaking groove is 45°.

[0050] The arc-edge rake face 11, the cutting-edge rake face 10 and the chip breaker 8 form a chip-breaking groove. A plurality of heat dissipation holes 9 are provided on the cutting-edge rake face 10, and the heat dissipation holes 9 are symmetrically distributed on both sides of the central connection line from the arc edge 7 to the positioning hole. The depth of the heat dissipation hole 9 is 0.02 - 0.08 mm, and the radius R is 0.1 - 0.3 mm. The vertical distance H2 between the bottom of the chip-breaking groove and the cutting edge 6 is 0.05 - 0.2 mm; the vertical distance H1 between the cutting edge 6 and the highest point of the chip breaker 8 is 0.15 mm, and the horizontal distance L1 between the bottom of the chip-breaking groove and the arc edge 7 is 0.2 - 0.7 mm.

[0051] Example 5

[0052] This embodiment provides a stainless steel cutting blade, including a blade body 1. The blade body 1 includes an upper positioning surface 2, a lower positioning surface 3, and three side surfaces 4 connecting the upper positioning surface 2 and the lower positioning surface 3. The adjacent side surfaces 4 are connected by an arc surface 5, and the included angle β between the side surface 4, the arc surface 5 and the vertical plane is 7°. The side surface 4 intersects with the upper positioning surface 2 to form a cutting edge 6, and the arc surface 5 intersects with the upper positioning surface 2 to form an arc edge 7. A positioning center hole 20 is provided at the geometric center of the blade body 1.

[0053] A cutting unit is provided at the vertex angle of the blade body 1. The cutting unit includes a cutting edge 6, an arc edge 7, a rake face, a chip breaker 8 and a heat dissipation hole 9. As Figure 4 , the rake face includes an arc-edge rake face 11 and a cutting-edge rake face 10. The rake angle α between the arc-edge rake face 11 and the upper positioning surface 2 is 14°. As Figure 5 , the rake angle γ between the cutting-edge rake face 10 and the upper positioning surface 2 is a variable angle, gradually changing from 14° at the tangent connection with the arc edge 7 to 10° in the middle of the cutting edge 6, following the machining principle of 'being sharp for small cutting depths and blunt for large cutting depths'.

[0054] The chip breaker 8 is in a conical shape, including an arc-shaped surface and side inclined surfaces connected to the cutting-edge rake face 10 on both sides. One end of the arc-shaped surface is connected to the arc-edge rake face 11, and the other end is tangent to the upper positioning surface 2. The cross-section of the arc-shaped surface in the central connection line from the arc edge 7 to the positioning hole is arc-shaped, and the arc radius R1 is 8 mm. The included angle between the side inclined surface and the bottom plane of the chip-breaking groove is 45°.

[0055] The arc-edge rake face 11, the cutting-edge rake face 10 and the chip breaker 8 form a chip-breaking groove. Three heat dissipation holes 9 are respectively provided on the cutting-edge rake faces 10 on both sides of the chip breaker 8. The heat dissipation holes 9 are arranged within the maximum cutting depth range of the cutting blade, and the heat dissipation holes 9 are symmetrically distributed on both sides of the central connection line from the arc edge 7 to the positioning hole. The depth of the heat dissipation holes 9 is 0.02 - 0.08 mm, and the radius R is 0.1 - 0.3 mm. The heat dissipation holes closer to the arc edge have a smaller cutting depth and a smaller hole diameter, and the cutting depth and the hole diameter of the heat dissipation holes farther away from the arc edge are larger. The greater the cutting depth, the more heat is generated during cutting. The larger the heat dissipation holes, the faster the heat dissipation time. The vertical distance H2 between the bottom of the chip-breaking groove and the cutting edge 6 is 0.1 mm; the vertical distance H1 between the cutting edge 6 and the highest point of the chip breaker 8 is 0.15 mm, and the horizontal distance L1 between the bottom of the chip-breaking groove and the arc edge 7 is 0.2 - 0.7 mm.

[0056] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A stainless steel cutting blade, characterized in that, It includes a blade body and a cutting unit provided on the blade body; the blade body is provided with a positioning center hole, and the blade body includes an upper positioning surface, a lower positioning surface, and a plurality of side surfaces connecting the upper positioning surface and the lower positioning surface. The side surfaces are connected by arc surfaces, and the intersection of the side surfaces and the upper positioning surface forms a cutting edge, and the intersection of the arc surface and the upper positioning surface forms an arc edge; the cutting unit includes a cutting edge, an arc edge, a rake face, a chip breaker platform, and cooling holes. The intersection of the rake face and the chip breaker platform forms a chip breaking groove, and cooling holes are provided on the rake face.

2. The stainless steel cutting blade according to claim 1, characterized in that, The rake face includes a rake face of the arc edge and a rake face of the cutting edge. The rake angle α between the rake face of the arc edge and the upper positioning surface is 10°-20°, and the rake angle γ between the rake face of the cutting edge and the upper positioning surface is 10°-20°.

3. The stainless steel cutting blade according to claim 2, wherein, The rake angle γ of the rake face of the cutting edge is a variable angle, which gradually changes from the connection of the cutting edge and the arc edge to the middle of the cutting edge.

4. The stainless steel cutting blade according to claim 1, wherein, The chip breaker platform includes an arc surface and side inclined surfaces connected to the rake face on both sides. The cross-section of the arc surface on the center connection line of the arc edge positioning holes is arc-shaped.

5. The stainless steel cutting blade according to claim 4, wherein The arc radius R1 of the arc-shaped cross-section is 5-12 mm.

6. The stainless steel cutting blade according to claim 4, wherein The angle between the side inclined surface and the bottom plane of the chip breaking groove is 35-55°.

7. The stainless steel cutting blade according to claim 1, wherein A plurality of cooling holes are provided on the rake face, and the cooling holes are symmetrically distributed on both sides of the center connection line from the arc edge to the positioning hole.

8. The stainless steel cutting blade according to claim 1 or 7, characterized in that, The depth of the cooling hole is 0.02-0.08 mm, and the radius R is 0.1-0.3 mm.

9. The stainless steel cutting blade according to claim 1, wherein The vertical distance H2 between the bottom of the chip breaking groove and the cutting edge is 0.05-0.2 mm; the vertical distance H1 between the cutting edge and the highest point of the chip breaker platform is 0.1-0.25 mm.

10. The stainless steel cutting blade according to claim 1, wherein The angle β between the side surface, the arc surface and the vertical plane is 3-15°.

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