CN201632699U - Rotatable square milling blade - Google Patents

Abstract

An indexable square milling insert is basically composed of a parallelepiped and comprises a front cutter face and a rear cutter face, a body is symmetrically distributed into two unit edges by taking the geometric center of the rear cutter face as a symmetrical point, each unit edge comprises a side face positioned between the front cutter face and the rear cutter face and a bottom face positioned between the front cutter face and the rear cutter face and intersected with the side face, the front cutter face is intersected with the side face to form a main cutting edge, the front cutter face is intersected with the bottom face to form a secondary cutting edge, the width of the side face is gradually reduced from the bottom face so as to enable the main cutting edge to be arc-shaped, a spiral face extending along the main cutting edge is arranged at the position of the side face close to the main cutting edge, and a positive rake angle is formed between the main cutting; the helicoid is favorable to dispersing the cutting load of main cutting edge in cutting process, makes the cutting force distribute balancedly, has reduced the vibration of milling cutter piece in the cutting process, is difficult for producing the tipping, is favorable to improving the utility model discloses a life.

Description

An indexable square milling insert

Technical field:

The utility model relates to the technical field of milling inserts, in particular to an indexable square milling insert.

Background technique:

At present, the inserts used in milling tools at home and abroad generally use milling inserts with flat rake faces. There is also a rectangular milling insert, which has a serrated cutting edge groove shape. This milling insert has a chip breaking effect, but its tooth bottom is prone to stress concentration and microcracks during pressing production and use, which weakens the cutting edge. The strength of the edge and blade, and the tip of the tooth is easy to wear. Since the service life of the milling insert with the serrated cutting edge is relatively low, the overall cost of the milling process is relatively high.

Utility model content:

The purpose of the utility model is to provide an indexable square milling insert with balanced distribution of cutting force, not easy to chipping and long service life in view of the deficiencies of the prior art.

The purpose of this utility model is achieved through the following technical measures:

An indexable square milling insert is basically composed of a parallelepiped, including a rake face and a flank face, and the body is symmetrically distributed into two unit edges with the geometric center of the flank face as a symmetrical point, each Each unit edge includes a side face between the rake face and the flank, and a bottom face between the rake face and the flank and intersecting the side face, the rake face intersecting the side face Forming a main cutting edge, the rake face intersects with a bottom surface to form a secondary cutting edge, the sides gradually decrease in width from the bottom surface so that the main cutting edge is arc-shaped, and the sides are adjacent to the main cutting edge A helical surface extending along the main cutting edge is provided at the position of the main cutting edge, and a positive rake angle is formed between the main cutting edge and the rake face.

Further technical solutions of the utility model include:

A raised reinforcing rib extending along the main cutting edge is provided at the intersection of the helical surface and the side surface.

The side surface forms an obtuse angle with the flank.

Further, the bottom surface is provided with an axial protrusion at a position close to the side surface, and the part of the minor cutting edge axially protrudes from the rest of the minor cutting edge at the axial protrusion, and the axial protrusion has a bevel, the bevel is substantially perpendicular to the main cutting edge, the bevel transitions to the bottom surface through a helically twisted clearance surface, the inclination of the helically twisted clearance surface increases with the depth of cut, and the bevel passes through a smooth A transition surface transitions to the side.

Wherein, the bottom surface and the flank face form an obtuse angle, and a positive rake angle is formed between the minor cutting edge and the rake face.

According to the above, a positioning hole is provided in the center of the rake face, the positioning hole penetrates to the flank face, and the axis line of the positioning hole is perpendicular to the flank face.

A positioning surface is provided at a position close to the positioning hole on the rake surface.

The beneficial effects of the utility model are: the indexable square milling insert is basically composed of a parallelepiped, including a rake face and a flank face, and the body is symmetrically distributed into two parts with the geometric center of the flank face as a symmetrical point. A unit edge, each unit edge includes a side surface between the rake face and the flank, and a bottom surface between the rake face and the flank and intersecting the side, the rake The main cutting edge is formed by the intersection of the rake face and the side surface, and the minor cutting edge is formed by the intersection of the rake face and the bottom surface. The width of the side surface gradually decreases from the bottom surface, so that the main cutting edge is arc-shaped. The position of the main cutting edge is provided with a helical surface extending along the main cutting edge, and a positive rake angle is formed between the main cutting edge and the rake face; the helical surface is conducive to dispersing the main cutting edge during cutting. The cutting load makes the cutting force evenly distributed, reduces the vibration of the milling blade during the cutting process, and is not easy to produce chipping, which is beneficial to improve the service life of the utility model.

Description of drawings:

The utility model is further described by using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present utility model.

Fig. 1 is a structural schematic diagram of an indexable square milling insert of the present invention;

Fig. 2 is a schematic diagram of the structure of the rake face of the indexable square milling insert of the present invention;

Fig. 3 is a schematic diagram of the side structure of the indexable square milling insert of the present invention;

Fig. 4 is a schematic diagram of the flank structure of the indexable square milling insert of the present invention;

Fig. 5 is a schematic diagram of the bottom surface structure of the indexable square milling insert of the present invention.

Figures 1 to 5 include:

1——unit edge 11——rake face 12——flank face

2——Side 3——Bottom 31——Axial protrusion

311——Incline 32——Spiral twist surface 33——Transition surface

4——Main cutting edge 5——Auxiliary cutting edge 6——Helicoid

7——Reinforcing Rib 8——Positioning Hole 9——Positioning Surface

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described, see shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, and this is a preferred embodiment of the present utility model:

An indexable square milling insert, which basically consists of a parallelepiped, including a rake face 11 and a flank face 12, the body is symmetrically distributed into two units with the geometric center of the flank face 12 as a symmetrical point Edge 1, each unit edge 1 includes a side 2 between the rake face 11 and the flank 12, and is located between the rake face 11 and the flank 12 and intersects with the side 2 The bottom surface 3 of the bottom surface 3, the rake surface 11 intersects with the side surface 2 to form a main cutting edge 4, the rake surface 11 intersects with the bottom surface 3 to form a minor cutting edge 5, and the width of the side surface 2 gradually decreases from the bottom surface 3, Thus, the main cutting edge 4 is arc-shaped, and the side surface 2 is provided with a helical surface 6 extending along the main cutting edge 4 near the main cutting edge 4, and the main cutting edge 4 and the rake face A positive rake angle is formed between 11.

The helical surface 6 of the utility model is beneficial to disperse the cutting load of the main cutting edge 4 in the cutting process, so that the cutting force is distributed evenly, and the vibration of the milling blade during the cutting process is reduced, and it is not easy to produce chipping, which is beneficial to improve the cutting performance. Service life of the utility model.

The positive rake angle facilitates chip removal and at the same time increases the strength of the main cutting edge 4 .

A raised reinforcing rib 7 extending along the main cutting edge 4 is provided at the intersection of the helical surface 6 and the side surface 2 . The ribs 7 improve the strength of the main cutting edge 4, and the main cutting edge 4 is not prone to chipping during use.

As shown in FIG. 5 , the side surface 2 forms an obtuse angle with the flank 12 . That is to say, a relief angle is formed between the side surface 2 and the main cutting edge 4, and the relief angle can form a clearance space during the cutting process, so as to avoid the gap between the side surface 2 other than the cutting edge and the workpiece removal allowance. The surface contact makes the cutting process smooth, and at the same time, the residual chips remaining on the surface of the workpiece can also be discharged from the tolerance space to prevent these debris from scratching the surface of the workpiece.

As shown in FIG. 2 , the bottom surface 3 is provided with an axial protrusion 31 at a position close to the side surface 2 , and the minor cutting edge 5 protrudes axially from the rest of the minor cutting edge 5 at the axial protrusion 31 . Part, the axial protrusion 31 has a slope 311, the slope 311 is substantially perpendicular to the main cutting edge 4, the slope 311 transitions to the bottom surface 3 through a helically twisted gap surface 32, the spiral twisted gap surface The inclination angle of 32 increases with the increase of cutting depth, and the slope 311 transitions to the side surface 2 through a smooth transition surface 33 .

Wherein, the axial direction refers to the axial direction relative to the central axis of the milling cutter head. Due to the existence of the axial protrusion 31 , the axial feed of the secondary cutting edge 5 is smoother.

When the clamping direction of the utility model is changed, the functions of the main cutting edge 4 and the secondary cutting edge 5 are interchanged, so that the blade of the utility model can be used for both end milling and flat milling. The slope 311 of the axial protrusion 31 is substantially perpendicular to the main cutting edge 4, thereby ensuring the verticality of the machined side 2 of the workpiece during end milling; the arc-shaped main cutting edge 4 plays the role of a wiper edge during flat milling, which is relatively The roughness of the milled surface is well guaranteed.

Wherein, the bottom surface 3 and the flank face 12 form an obtuse angle, and the minor cutting edge 5 and the rake face 11 form a positive rake angle. The obtuse angle forms a relief angle between the bottom surface 3 and the minor cutting edge 5 , and the effect of the relief angle and the positive rake angle is the same as that of the above-mentioned main cutting edge 4 .

According to the above, the center of the rake face 11 is provided with a positioning hole 8 , the positioning hole 8 penetrates to the flank 12 , and the axis of the positioning hole 8 is perpendicular to the flank 12 . When the utility model is installed on the milling cutter head, the milling blade is fixed on the milling cutter head through the connecting screw passing through the positioning hole 8 .

The rake surface 11 is provided with a positioning surface 9 at a position close to the positioning hole 8 . After the utility model is fixedly installed on the milling cutter head, the positioning surface 9 cooperates with the positioning device of the milling cutter head to constrain the position of the utility model relative to the cutter head, so as to prevent the milling blade from being damaged during use. Offset affects cutting accuracy.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (7)

1. An indexable square milling insert, which basically consists of a parallelepiped, including a rake face and a flank, and the body is symmetrically distributed into two unit blades with the geometric center of the flank as a symmetrical point , each unit edge includes a side face between the rake face and the flank face, and a bottom face between the rake face and the flank face and intersecting the side face, the rake face and the flank face The side faces intersect to form a main cutting edge, and the rake face and the bottom surface intersect to form a minor cutting edge, which is characterized in that: the width of the side face gradually decreases from the bottom face, so that the main cutting edge is arc-shaped, and the side face A helical surface extending along the main cutting edge is provided near the main cutting edge, and a positive rake angle is formed between the main cutting edge and the rake face. 2 . The indexable square milling insert according to claim 1 , wherein a raised rib extending along the main cutting edge is provided at the intersection of the helical surface and the side surface. 3 . 3. An indexable square milling insert according to claim 2, characterized in that: the side surface forms an obtuse angle with the flank. 4. An indexable square milling insert according to claim 3, characterized in that: the bottom surface is provided with an axial protrusion near the side, and the secondary cutting edge is positioned on the axial protrusion. A portion of the axial protrusion protrudes from the rest of the minor cutting edge, and the axial protrusion has an inclined surface, which is substantially perpendicular to the main cutting edge, and the inclined surface transitions to the bottom surface through a helical twist gap surface, the helical The inclination angle of the twisted clearance surface increases with the depth of cut, said slope transitions to said side surface via a smooth transition surface. 5. An indexable square milling insert according to claim 4, characterized in that: the bottom surface and the flank face form an obtuse angle, and a gap is formed between the secondary cutting edge and the rake face Positive rake angle. 6. An indexable square milling insert according to any one of claims 1-5, characterized in that: a positioning hole is opened in the center of the rake face, and the positioning hole penetrates to the flank face, The axis of the positioning hole is perpendicular to the flank. 7 . The indexable square milling insert according to claim 6 , wherein a positioning surface is provided on the rake surface close to the positioning hole. 8 .

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