An outer fine milling cutter for machining the main journal and the connecting rod journal of a crankshaft

Abstract

The utility model provides a kind of crankshaft processing main journal connecting rod neck outer fine milling cutter, belong to tool field.It solves the problem of easy wear and tear, low machining precision of existing milling cutter blade for crankshaft processing.The crankshaft processing main journal connecting rod neck outer fine milling cutter, including the milling cutter disc of cylindrical structure setting, the milling cutter disc has the several evenly distributed connecting teeth around its outer circumference, several connecting teeth are all installed with tool holder, tool holder has two first milling cutter grooves located in upper end face and four second milling cutter grooves located in two side faces, second milling cutter groove is two in left and right side faces and staggered distribution, diameter milling cutter for milling neck diameter size is installed in first milling cutter groove, slot milling cutter for milling shaft shoulder arc groove is installed in second milling cutter groove.The utility model has the advantages of convenient replacement and maintenance, high milling cutter life and high machining precision.

Description

Technical Field

[0001] This utility model belongs to the field of cutting tools, and relates to a milling cutter, particularly to a crankshaft machining main journal and connecting rod journal external precision milling cutter. Background Technology

[0002] As an important part of the engine, the crankshaft bears the force transmitted from the connecting rod and converts it into torque, which is then output through the crankshaft to drive other accessories on the engine. Therefore, the actual production process of the crankshaft has high requirements. Currently, the crankshaft journal is mainly machined by milling. However, since the cutting edge and the crankshaft journal are always in intermittent contact during milling, the impact during the machining process is large, which reduces the machining accuracy and affects the tool life.

[0003] For example, a utility model patent with patent number "202222857665.7" and patent title "A whirlwind milling cutter for machining crankshaft connecting rod journals in automobiles" discloses a milling cutter for machining crankshafts, including a cutter head body. The cutter head body has uniformly distributed first milling cutter grooves, which are parallelogram-shaped grooves with openings on both sides. The two side walls of the first milling cutter grooves have an included angle of less than 90 degrees. Adjacent first milling cutter grooves are connected by second milling cutter grooves, and the distance between adjacent second milling cutter grooves is equal. The second milling cutter grooves are also parallelogram-shaped grooves with openings on both sides. The structure features a second milling cutter groove with an included angle of less than 90 degrees between its two side walls. Both the first and second milling cutter grooves have threaded holes at their bottoms. A first tool structure is installed within each groove, and is fixed in place by screws and threaded holes. This structure has milling cutter grooves on both sides for fixing the tool, resulting in a relatively secure tool fixation. However, this insert layout does not fully utilize the outer circumference of the milling cutter disc, leading to a smaller number of inserts and an increased cutting depth per insert. Combined with the impact force during crankshaft journal machining, the inserts are prone to wear, affecting accuracy and lifespan.

[0004] Therefore, a high-precision, durable, and durable crankshaft machining journal and connecting rod journal external end mill is currently in demand. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a crankshaft machining main journal and connecting rod journal external milling cutter with durable cutting tools and high machining accuracy.

[0006] The objective of this utility model can be achieved through the following technical solution: A crankshaft machining main journal connecting rod journal external precision milling cutter, characterized in that it includes a milling cutter disc with a cylindrical structure, the milling cutter disc having a plurality of evenly distributed connecting teeth arranged around its outer circumference, a tool holder being installed at each of the plurality of connecting teeth, the tool holder having two first milling cutter slots on the upper end face and four second milling cutter slots on the two sides, the second milling cutter slots being two on each of the left and right sides and staggered, the first milling cutter slots each being equipped with a diameter milling cutter for milling the journal diameter, and the second milling cutter slots each being equipped with a grooving cutter for milling the shoulder arc groove.

[0007] In the aforementioned crankshaft machining main journal connecting rod journal external milling cutter, the connecting teeth are distributed counterclockwise and a transition hole is provided between two adjacent connecting teeth. The transition hole is semi-circular in structure, and the upper end face of the connecting teeth is inclined.

[0008] In the aforementioned crankshaft machining main journal connecting rod journal external finish milling cutter, the first milling cutter groove includes a first mounting surface for mounting the diameter milling cutter and two first positioning surfaces for the diameter milling cutter side to abut against.

[0009] In the aforementioned crankshaft machining main journal connecting rod journal external finish milling cutter, the second milling cutter groove includes a second mounting surface for mounting the grooving milling cutter and two second positioning surfaces for the side of the grooving milling cutter to abut against.

[0010] In the aforementioned crankshaft machining main journal connecting rod journal external precision milling cutter, clearance grooves are provided between the two first positioning surfaces and the first mounting surface, and between the two second positioning surfaces and the second mounting surface.

[0011] In the aforementioned crankshaft machining main journal connecting rod journal external precision milling cutter, chip removal channels are provided on both one side of the first milling cutter groove and one side of the second milling cutter groove.

[0012] In the aforementioned crankshaft machining main journal connecting rod journal external precision milling cutter, one side of the tool holder has an extension for abutting and positioning against the side of the connecting tooth. The milling cutter disc and several tool holders are all fastened with hexagonal head screws, and several diameter milling cutters and tool holders, and several grooving milling cutters and tool holders are all fastened with Torx screws.

[0013] Compared with existing technologies, this crankshaft machining main journal and connecting rod journal external finish milling cutter has the following advantages:

[0014] 1. By using several connecting teeth on the milling cutter head, a tool holder fixed on the connecting teeth, and several milling cutters fixed on the tool holder, it is possible to choose to replace the entire tool holder or replace a single milling cutter on the tool holder, which is convenient for maintenance;

[0015] 2. By installing milling cutters on the upper end face and both sides of the tool holder, and staggering the milling cutters on both sides, the utilization rate of the tool holder surface is improved, allowing more milling cutters to be installed on the same milling cutter head, thereby reducing the single cutting amount of each milling cutter, improving the milling cutter life and machining accuracy. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the milling cutter for machining the main journal and connecting rod journal of this crankshaft.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of the milling cutter head.

[0018] Figure 3 This is a three-dimensional structural diagram of the tool holder.

[0019] Figure 4 This is a three-dimensional structural diagram of the tool holder.

[0020] In the diagram, 1 is the milling cutter head; 2 is the connecting tooth; 3 is the tool holder; 4 is the first milling cutter groove; 5 is the second milling cutter groove; 6 is the diameter milling cutter; 7 is the grooving milling cutter; 8 is the transition hole; 9 is the first mounting surface; 10 is the first positioning surface; 11 is the second mounting surface; 12 is the second positioning surface; 13 is the clearance groove; 14 is the chip removal channel; 15 is the extension; 16 is the internal hex socket head cap screw; and 17 is the Torx screw. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, this crankshaft machining main journal connecting rod journal external finish milling cutter includes a milling cutter disc 1 with a cylindrical structure. The milling cutter disc 1 has several evenly distributed connecting teeth 2 arranged around its outer circumference. A tool holder 3 is installed at each of the connecting teeth 2. The tool holder 3 has two first milling cutter slots 4 on the upper end face and four second milling cutter slots 5 on the two sides. There are two second milling cutter slots 5 on each of the left and right sides, which are staggered. A diameter milling cutter 6 for milling the journal diameter is installed in each of the first milling cutter slots 4, and a grooving milling cutter 7 for milling the shoulder arc groove is installed in each of the second milling cutter slots 5.

[0023] Preferably, the connecting teeth 2 are distributed counterclockwise and a transition hole 8 is provided between two adjacent connecting teeth 2. The transition hole 8 is set in a semi-circular structure and the upper end face of the connecting teeth 2 is set at an angle.

[0024] Preferably, the first milling cutter groove 4 includes a first mounting surface 9 for mounting a diameter milling cutter 6 and two first positioning surfaces 10 for the side of the diameter milling cutter 6 to abut against.

[0025] Preferably, the second milling cutter groove 5 includes a second mounting surface 11 for mounting the grooving cutter 7 and two second positioning surfaces 12 for the side of the grooving cutter 7 to abut against.

[0026] Preferably, clearance grooves 13 are provided between the two first positioning surfaces 10 and the first mounting surface 9, and between the two second positioning surfaces 12 and the second mounting surface 11.

[0027] Preferably, chip removal channels 14 are provided on one side of the first milling cutter groove 4 and on one side of the second milling cutter groove 5.

[0028] Preferably, the tool holder 3 has an extension 15 on one side for positioning against the side of the connecting tooth 2. The milling cutter disc 1 and several tool holders 3 are fastened with hexagonal head screws 16. Several diameter milling cutters 6 and tool holders 3, and several grooving milling cutters 7 and tool holders 3 are fastened with Torx screws 17.

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0030] Although this document frequently uses terms such as milling cutter disc 1, connecting tooth 2, tool holder 3, first milling cutter groove 4, second milling cutter groove 5, diameter milling cutter 6, grooving milling cutter 7, transition hole 8, first mounting surface 9, first positioning surface 10, second mounting surface 11, second positioning surface 12, clearance groove 13, chip removal channel 14, extension 15, internal hex socket head cap screw 16, Torx screw 17, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A crankshaft machining main journal connecting rod journal external finish milling cutter, comprising a milling cutter disc (1) arranged in a cylindrical structure, characterized in that, The milling cutter disc (1) has several evenly distributed connecting teeth (2) arranged around its outer circumference. A tool holder (3) is installed at each of the connecting teeth (2). The tool holder (3) has two first milling cutter slots (4) on the upper end face and four second milling cutter slots (5) on the two sides. There are two second milling cutter slots (5) on each of the left and right sides, which are staggered. A diameter milling cutter (6) for milling the diameter of the journal is installed in each of the first milling cutter slots (4). A grooving cutter (7) for milling the circular arc groove of the shoulder is installed in each of the second milling cutter slots (5).

2. The crankshaft machining main journal and connecting rod journal external finish milling cutter according to claim 1, characterized in that, The connecting teeth (2) are distributed counterclockwise and a transition hole (8) is provided between two adjacent connecting teeth (2). The transition hole (8) is set in a semi-circular structure and the upper surface of the connecting teeth (2) is set at an angle.

3. The crankshaft machining main journal and connecting rod journal external finish milling cutter according to claim 1, characterized in that, The first milling cutter groove (4) includes a first mounting surface (9) for mounting a diameter milling cutter (6) and two first positioning surfaces (10) for the side of the diameter milling cutter (6) to abut against. The second milling cutter groove (5) includes a second mounting surface (11) for mounting the grooving cutter (7) and two second positioning surfaces (12) for the side of the grooving cutter (7) to abut.

4. The crankshaft machining main journal and connecting rod journal external finish milling cutter according to claim 3, characterized in that, A clearance groove (13) is provided between the two first positioning surfaces (10) and the first mounting surface (9), and between the two second positioning surfaces (12) and the second mounting surface (11).

5. A crankshaft machining main journal and connecting rod journal external finish milling cutter according to claim 1, characterized in that, Chip removal channels (14) are provided on one side of the first milling cutter groove (4) and on one side of the second milling cutter groove (5).

6. The crankshaft machining main journal and connecting rod journal external finish milling cutter according to claim 1, characterized in that, The tool holder (3) has an extension (15) on one side for positioning against the side of the connecting tooth (2). The milling cutter disc (1) and several tool holders (3) are fastened with hexagonal head screws (16). Several diameter milling cutters (6) and tool holders (3), and several grooving milling cutters (7) and tool holders (3) are fastened with Torx screws (17).

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