Welded hard alloy blade type four-blade inner-cooling type finish milling cutter

Abstract

The utility model discloses a welded hard alloy blade type four-blade inner-cooling finish milling cutter which comprises a cutter body and blades, the front section of the cutter body is a cutting part, the rear section of the cutter body is a cutter handle, four blade strips are arranged around the peripheral surface of the cutting part, the blade strips are arranged on the peripheral surface of the cutting part in a right spiral shape, and the included angle between each blade strip and the axis of the cutter body is 10 degrees; the blade is welded to the front end of the main tangent plane, and a cutter groove is formed in the rear side of the blade and spirally extends towards the cutter handle from the front end face of the cutter body. The cutter body is made of 42CrMo alloy structural steel, and the blade is made of hard alloy. According to the cutter, the hard alloy blade is welded on the machining part of the cutter body mainly made of the steel material, so that the cost of the cutter can be greatly reduced, the service life of the cutter is prolonged, and the cutter is suitable for finish milling of aluminum alloy shell parts.

Description

Technical Field

[0001] The utility model belongs to the field of metal for machining tools, and particularly relates to a welded cemented carbide insert type four-edge internal cooling fine milling cutter. Background Art

[0002] With the rapid development of the new energy vehicle industry, the processing requirements for automotive parts mainly made of die-cast aluminum alloy, such as cylinder head covers, sensor brackets, cylinder blocks, etc., are getting higher and higher. Since these automotive parts all have sealing requirements, their installation end faces need to be finely milled. Due to the requirements for accuracy, there are many processing difficulties in the processing of such parts. At present, cemented carbide milling cutters are mainly used to complete the fine milling of die-cast aluminum alloy. However, the manufacturing and use costs of cemented carbide tools are very high. With the general expectation of strict cost control in vehicle enterprises, the existing fine milling cutters cannot meet the expectations of customers. Therefore, it is necessary to develop a finishing tool suitable for aluminum alloy shells to meet the requirements of cost reduction and efficiency improvement. Summary of the Invention

[0003] In view of the above problems and technical requirements, the utility model provides a welded cemented carbide insert type four-edge internal cooling fine milling cutter. By welding cemented carbide inserts on the machining part of the cutter body mainly made of steel material, the cost of the cutter itself can be greatly reduced and the service life of the cutter can be extended, which is suitable for the fine milling of parts such as aluminum alloy shells.

[0004] The technical solution of the utility model is as follows: A welded cemented carbide insert type four-edge internal cooling fine milling cutter includes a cutter body and inserts. The front section of the cutter body is the cutting part, and the rear section is the tool shank. Four cutting edges are arranged around the circumferential surface of the cutting part, and the cutting edges are arranged in a right-handed spiral shape on the circumferential surface of the cutting part. The angle between the cutting edge and the axis of the cutter body is 10°; the front side of the cutting edge is the main cutting plane, and the insert is welded at the front end of the main cutting plane. The rear side of the cutting edge is a cutter groove, and the cutter groove extends from the front end face of the cutter body in a spiral shape towards the tool shank direction; the manufacturing material of the cutter body is 42CrMo alloy structural steel, and the manufacturing material of the insert is cemented carbide.

[0005] Further, the insert is welded at the corner of the main cutting plane. The insert is rectangular, the front end of the insert is flush with the front end face of the cutter body, the cutting edge of the insert protrudes from the outer side of the cutting edge, and a chamfer is processed at the corner of the insert.

[0006] Further, along the rotation direction of the cutting part on the cutting edge, a blade support surface, a first flank face and a second flank face are sequentially arranged. The blade support surface provides thickness support for the welding of the insert and the main cutting surface. The angle between the first flank face and the blade support surface is the first flank angle α, and the angle between the second flank face and the blade support surface is the second flank angle β. By setting the first flank face and the second flank face, the sharpness of the cutting edge of the insert can be ensured and the cutting force can be reduced.

[0007] Furthermore, the value range of the first flank angle is 10° ≤ α ≤ 12°, and the value range of the second flank angle is 20° ≤ β ≤ 30°.

[0008] Furthermore, chamfers with the same shape as the blade chamfer are machined between the blade support surface, the first flank surface, the second flank surface and the front end surface of the tool body. Setting a chamfer at the cutting edge of the blade can prevent the blade from chipping and protect the strength of the cutting edge. A chamfer consistent with the blade chamfer should also be machined on the land located behind the rotation of the blade to ensure the neat and smooth cutting effect of the cutting edge.

[0009] Furthermore, a through internal cooling hole is provided at the center of the tool body. The internal cooling hole can effectively cool the cutting edge, prevent the cutting edge of the blade from overheating during machining, which affects the machining efficiency, and protect the cutting edge and the workpiece.

[0010] The beneficial effects of the present utility model are as follows: 1) Two different materials are combined together by welding, and then the structure of this milling cutter is formed after grinding by a simple tool grinder. The structure is simple and easy to form, reducing the processing cost. The tool body of this finish milling cutter is made of 42CrMo alloy structural steel, and the blade welded on the tool body is a cemented carbide blade, reducing the usage amount of cemented carbide. For example, taking a four-edge milling cutter with D10*25*L75 as an example, the weight of the required cemented carbide material is more than 70g. For a four-edge milling cutter of the same size manufactured using this structure, the weight of the cemented carbide blade is only 3g, and the manufacturing cost of the tool body is low, greatly saving the material cost of the tool itself; 2) By providing an internal cooling hole in the tool body, according to the characteristics of aluminum alloy being soft and easy to adhere, it is ensured that during high-speed milling of aluminum alloy materials, the cutting edge is effectively cooled, reducing workpiece deformation and chip adhesion on the cutting edge, and ensuring machining accuracy. Description of the Drawings

[0011] Figure 1 is a three-dimensional structure diagram of the tool body of the finish milling cutter of the present utility model;

[0012] Figure 2 is an axial structure diagram of the finish milling cutter of the present utility model;

[0013] Figure 3 is an end face structure diagram of the finish milling cutter of the present utility model;

[0014] The markings in the figure are: tool body 1, internal cooling hole 11, cutting part 2, tool shank 3, land 4, blade support surface 41, first flank surface 42, second flank surface 43, principal section 5, tool groove 6, blade 7, chamfer 71. Detailed Embodiments

[0015] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0016] As Figures 1 - 3The figure shows a four-edge internal cooling type fine milling cutter with a welded cemented carbide blade of the present utility model, which includes a cutter body 1 and a blade 7. The front section of the cutter body 1 is a cutting part 2, and the rear section is a tool shank 3. Four cutting edges 4 are provided around the circumferential surface of the cutting part 2, and the cutting edges 4 are arranged in a right-handed spiral shape on the circumferential surface of the cutting part 2. The angle between the cutting edge 4 and the axis of the cutter body is 10°; the front side of the cutting edge is the main cutting plane 5, and the blade 7 is welded to the front end of the main cutting plane 5. The manufacturing material of the cutter body 1 is 42CrMo alloy structural steel, and the manufacturing material of the blade 7 is cemented carbide. By welding, two different materials are combined together, and then the structure of this milling cutter is formed after grinding by a simple tool grinder. The structure is simple and easy to form, reducing the processing cost. The cutter body of this fine milling cutter uses 42CrMo alloy structural steel, and the blade welded on the cutter body is a cemented carbide blade, reducing the usage amount of cemented carbide. The manufacturing cost of the cutter body is low, greatly saving the material cost of the tool itself.

[0017] The blade 7 is welded at the corner of the main cutting plane 5. The blade 7 is rectangular, the front end of the blade is flush with the front end face of the cutter body, the cutting edge of the blade protrudes from the outer side of the cutting edge, and a chamfer 71 is processed at the corner of the blade; behind the cutting edge 4 is a cutter groove 6, and the cutter groove 6 extends from the front end face of the cutter body in a spiral shape towards the tool shank 3.

[0018] On the cutting edge 4 against the rotation direction of the cutting part 2, there are successively provided a blade support surface 41, a first flank 42 and a second flank 43. The blade support surface 41 provides a thickness support for the welding of the blade 7 and the main cutting surface 5. The angle between the first flank 42 and the blade support surface 41 is the first flank angle α, and the angle between the second flank 43 and the blade support surface 41 is the second flank angle β. By setting the first flank 42 and the second flank 43, the sharpness of the cutting edge of the blade can be ensured, and the cutting force can be reduced. The value range of the first flank angle is 10°≤α≤12°, and the value range of the second flank angle is 20°≤β≤30°.

[0019] Chamfers with the same shape as the blade chamfer are processed between the blade support surface 41, the first flank 42, the second flank 43 and the front end face of the cutter body. Setting a chamfer at the cutting edge of the blade 7 can prevent the blade from chipping and protect the strength of the cutting edge. The cutting edge located behind the rotation of the blade should also be processed with a chamfer consistent with the blade chamfer to ensure the neat and smooth cutting effect of the cutting edge.

[0020] A through internal cooling hole 11 is provided at the center of the cutter body 1; by setting the internal cooling hole 11 in the cutter body, according to the characteristics of aluminum alloy with soft texture and easy adhesion, it is ensured that during high-speed milling of aluminum alloy materials, effective cooling of the cutting edge is achieved, reducing workpiece deformation and chip adhesion on the cutting edge, and ensuring machining accuracy.

[0021] As described above, only several preferred embodiments of the present utility model are provided, but the protection scope of the present utility model is not limited thereto. Any changes and substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A welded carbide blade type four-edge internal cooling type precision milling cutter, characterized in that: It includes a blade body and a cutter, the front section of the blade body is a cutting section, the rear section is a handle, four cutting edges are arranged around the circumference of the cutting section, the cutting edges are arranged in a right spiral shape on the circumference of the cutting section, and the angle between the cutting edges and the axis of the blade body is 10°; the front side of the cutting edge is a main cutting surface, the blade is welded to the front end of the main cutting surface, the rear side of the cutting edge is a cutting groove, and the cutting groove extends from the front end of the blade body in a spiral shape toward the handle; the blade body is made of 42CrMo alloy structural steel, and the blade is made of cemented carbide.

2. A welded carbide blade type four-edge internal cooling type finishing milling cutter according to claim 1, characterized in that: The blade is welded at the corner of the main cutting surface, the blade is rectangular, the front end of the blade is flush with the front end surface of the blade body, the blade edge protrudes from the outer side of the blade band, and the corner of the blade is chamfered.

3. A welded carbide blade type four-edge internal cooling type finishing milling cutter according to claim 2, characterized in that: The blade support surface, the first clearance angle surface and the second clearance angle surface are sequentially arranged on the cutting edge in the direction opposite to the rotation direction of the cutting portion. The blade support surface provides thickness support for the welding of the blade and the main cutting surface. The angle between the first clearance angle surface and the blade support surface is the first clearance angle α, and the angle between the second clearance angle surface and the blade support surface is the second clearance angle β.

4. A welded carbide blade type four-edge internal cooling type finishing milling cutter according to claim 3, characterized in that: The value range of the first back angle is 10°≤α≤12°, and the value range of the second back angle is 20°≤β≤30°.

5. A welded carbide blade type four-edge internal cooling type finishing milling cutter according to claim 4, characterized in that: The blade support surface, the first rear angle surface, the second rear angle surface and the front end surface of the blade body are all processed with chamfers that are consistent with the chamfer shape of the blade.

6. A welded carbide blade type four-edge internal cooling type finishing milling cutter according to claim 5, characterized in that: A through inner cooling hole is arranged at the center of the blade body.

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