CN209223214U - One kind being used for the indexable turnning and milling composite blade of big cutting-in hogging machining - Google Patents

Abstract

The invention discloses an indexable turning-milling compound blade for large-cut deep-cut machining, which belongs to the technical field of cutting tools for turning-milling compound machining. Solve the problem of poor stress state of the tool, easy chipping of the tool, and a large amount of cutting heat accumulation during the cutting process when the cutting depth is large, and the tool is subjected to variable load and variable frequency mechanical impact in heavy-duty cutting. In the cutting area, poor heat dissipation conditions of the tool lead to problems such as tool-chip bonding between the tool and the chip. The cutting edge of the insert is a negative chamfer cutting edge, and there is a circular arc edge transition between two adjacent negative chamfer cutting edges; There are rugby-shaped protrusions and cutting edge ribs on the face; there are fastening screw holes in the geometric center of the insert for connection with turning tool holders or milling cutter heads. The utility model is suitable for turning and milling compound processing of a typical large-scale forging with a water chamber head as a typical.

Description

An indexable turn-milling compound insert for large-cut deep-cutting

technical field

The utility model belongs to the technical field of cutting tools for turning and milling, in particular to an indexable turning and milling composite blade used for large-cut and deep-cut machining.

Background technique

The water chamber head of the nuclear island AP1000 evaporator is the most advanced third-generation nuclear power forging in the world and the most difficult to manufacture. The head of the evaporator water chamber is forged as a whole, and there are many forging defects on the surface to be processed, such as: Scale, forging cracks and metal coverings, etc. At present, the cutting methods for processing water chamber head parts mainly include heavy-duty turning and heavy-duty milling. The large parts of the evaporator water chamber head are processed into finished products, and the material removal rate is above 70%; the cutting depth a _p during the processing process is as high as 30mm, which generates a large cutting force, and the tool is easily formed at the cutting edge by high mechanical impact. Different degrees of damage can cause chipping and fracture; and a large amount of cutting heat will be accumulated in the cutting area during the cutting process, which will easily cause the tool-swarf bonding phenomenon, resulting in low tool life and frequent tool changes. The blades used in heavy-duty milling are different in structure and function, and cannot be used for each other. There are problems such as single function, narrow application range, and poor versatility, resulting in low processing efficiency.

Contents of the invention

The purpose of the utility model is to provide an indexable turning and milling compound blade for large cutting and deep cutting, which mainly solves the problem of variable frequency and load caused by large cutting parameters in the process of cutting the water chamber head as a typical part. Mechanical shock and thermal shock can easily cause chipping and fracture of the tool, as well as poor heat dissipation conditions of the tool during the cutting process, and excessive cutting temperature leads to tool-chip bonding failure and other problems.

In order to achieve the above purpose, the technical solution adopted by the utility model is: an indexable turning and milling compound blade for large-cut deep-cut processing, the blade is in the shape of a square truss, and the four outer edges of the rake face of the blade are respectively processed with negative The chamfered cutting edge has a circular arc edge transition between two adjacent negative chamfered cutting edges; the upper surface of the tool is provided with a square raised platform, and the side of the square raised platform and the rake face of the tool form a trapezoidal chip breaker. A reinforcing rib is provided on the rake face of the blade; a fastening screw hole is provided at the geometric center of the square raised platform on the upper surface of the blade.

The beneficial effects of the utility model:

The utility model adopts an integral structure design, which can reduce the processing cost of the blade; the upper surface of the blade is provided with a square raised platform, which increases the overall strength of the blade and improves the impact resistance of the blade. When the cutting parameters are large, the tool can maintain good stress state, it is not easy to cause chipping and fracture.

Four negative chamfered cutting edges are respectively processed on the four outer edges of the rake face of the insert. After one negative chamfered cutting edge fails, the other negative chamfered cutting edge can be used to continue cutting after it is indexed by 90°, thereby improving the processing efficiency. Efficiency, reduce the cost of use.

The insert adopts the design method of negative chamfer cutting edge, which can strengthen the strength of the cutting edge, reduce the vibration generated during the cutting process, and make the cutting more stable; every two adjacent negative chamfer cutting edges pass through the arc edge transition, which can strengthen the cutting edge. Tip strength, improve blade life.

There is a rugby-shaped protrusion on the rake face of the insert. When chips flow through the rugby-shaped protrusion, it can improve the chip breaking ability of the insert and slow down the wear of the rake face; at the same time, it reduces the contact area between the chip and the tool, increases the effective heat dissipation area of the tool, and reduces the cutting time. temperature.

A trapezoidal chip breaker is formed between the side of the square raised platform on the upper surface of the insert and the rake face, which makes the chip curl and deform and improves the chip breaking performance of the insert; if cutting fluid is used, the trapezoidal chip breaker can also accommodate a small amount of cutting Liquid, can give full play to its cooling and lubricating effect, make the chips flow out more smoothly, and the cooling speed is faster.

In the trapezoidal chip breaker of the insert, there is a cutting edge reinforcing rib on the rake face of the insert, which can avoid the failure of the insert due to edge chipping, increase the strength of the cutting edge, and at the same time divide and protect the main and auxiliary cutting edges, and improve the resistance of the cutting edge. Damage performance.

Install the blade on the turning tool holder or milling cutter through the fastening screw hole at the geometric center of the blade, which can quickly rotate the blade, improve the use efficiency and processing efficiency of the blade; at the same time, it can play a fixed clamping role to prevent the blade from being processed Rotation or sliding occurs during the process due to cutting force or friction.

Description of drawings

Fig. 1 is a front view of an indexable turning-milling composite insert for large-cut and deep-cut machining according to the utility model.

FIG. 2 is a top view of FIG. 1 .

Fig. 3 is a cross-sectional view along line A-A of Fig. 2 .

Labeled in the figure:

1- Rugby ball-shaped protrusion 2- Trapezoidal chip breaker 3- Rake face 4- Negative chamfer cutting edge 5- Fastening screw hole 6- Square raised platform 7- Arc edge 8- Cutting edge reinforcement rib.

Detailed ways

Specific Embodiment 1: As shown in Figures 1-3, an indexable turning-milling composite insert for large-cut deep-cut machining, the shape of the insert is in the shape of a square truss. The cutting edge of the insert is a negative chamfer cutting edge (4), and a circular arc edge transition (7) is provided between every two adjacent negative chamfer cutting edges (4); the square raised platform (6) on the upper surface of the insert is connected to the The rake face (3) forms a trapezoidal chipbreaker (2); on the insert rake face (3) there are rugby-shaped projections (1) and cutting edge ribs (8), and there is a fastening at the geometric center of the insert Screw holes (5).

Specific embodiment 2: In conjunction with Fig. 2, the rake face (3) of the blade in this embodiment is provided with a rugby-shaped protrusion (1), and the rake face (3) forms a trapezoid with the side of the square raised platform (6) Chipbreaker (2). The undisclosed technical features in this embodiment are the same as those in the first embodiment.

Embodiment 3: In conjunction with Fig. 1 , the thickness of the blade described in this embodiment is S=10mm. The undisclosed technical features in this embodiment are the same as those in the second embodiment.

Embodiment 4: The rake angle of the blade described in this embodiment is 9°-15°, the rear angle of the blade is 8°, and the inclination angle of the blade edge is 0°. The undisclosed technical features in this embodiment are the same as those in the third embodiment.

Specific embodiment five: In conjunction with Fig. 2, the cutting edge of the blade described in this embodiment adopts the design method of negative chamfering cutting edge (4), and an arc edge ( 7) Transition can not only improve the strength of the tool tip and improve the impact resistance of the tool, but also make the cutting smooth and reduce the vibration.

Specific embodiment 6: In conjunction with Fig. 2-Fig. 3, when the utility model is used for large-cut and deep-cut processing and indexable turning-milling composite processing, it is installed on the turning tool holder or milling cutter head through the fastening screw (5).

Claims (4)

1. An indexable turn-milling composite insert for large-cut deep-cut machining, the insert body is in the shape of a square truss, and it is characterized in that four negative chamfers are respectively processed on the four outer edges of the rake face (3) of the insert The cutting edge (4) is provided with a circular arc edge (7) transition between two adjacent negative chamfering cutting edges (4); the rake face (3) of the blade is provided with a square raised platform (6), and the The side of the square raised platform (6) on the blade face forms a trapezoidal chipbreaker (2) with the blade rake face (3); there are football-shaped protrusions (1) and cutting edge reinforcement ribs (8) on the blade rake face, A fastening screw hole (5) is provided at the geometric center of the blade. 2. According to claim 1, an indexable turning-milling compound insert for large-cut deep-cut machining, characterized in that: a cutting edge is provided on the rake face (3) of the insert in the trapezoidal chipbreaker (2) of the insert. Blade reinforcement (8). 3. According to claim 1, an indexable turning and milling compound insert for large-cut deep-cutting, characterized in that: the cutting edge of the insert adopts the design method of negative chamfering cutting edge (4), and every adjacent two negative The transition between the chamfered cutting edges (4) is via a circular arc edge (7). 4. According to claim 1, an indexable turning and milling composite insert for large-cut deep-cut machining, is characterized in that: the geometric center of the insert is processed with a fastening screw hole for connecting with the turning tool holder or the milling cutter ( 5).