RU201494U1 - CUTTING PLATE FOR THREADING - Google Patents

Abstract

The cutting insert has upper and lower surfaces parallel to each other, between which vertical side surfaces are located, and a cutting part in the form of a triangular cutting tooth protruding outwardly relative to the side surface of the insert. In this case, the specified cutting tooth has two outwardly converging main cutting edges, which are connected to each other by a radius cutting edge at the tooth tip. In this case, these cutting edges are located in a plane inclined downward relative to the tooth top, coinciding with the front surface of the cutting part of the insert. The rear surfaces of the cutting part of the insert, bounded from above by the cutting edges, are located at an angle of seven degrees relative to the vertical planes passing through the cutting edges. EFFECT: increased purity of the processed threaded surface. 5 ill.

Description

The utility model relates to tools for turning, namely, cutting inserts for threading with a triangular profile.

Known analogue - cutting plate - RU2715266, 05.24.2016, containing two opposite end surfaces connected to each other by a continuous peripheral surface, including alternating obtuse and acute-angled surfaces, separated by four side surfaces; the middle plane located between two opposite end surfaces and intersecting the peripheral side surface, the axis of the insert, perpendicular to the middle plane with the possibility of indexing the cutting insert around it, the cutting edge at the apex formed at the intersection of each acute-angled surface and each end surface, the longitudinal plane containing the axis plate and bisecting the four cutting edges at the vertex, the vertex located at the intersection of each cutting edge at the apex and the longitudinal plane, and a transverse plane containing the axis of the plate and halving two obtuse-angled surfaces, with each end surface having an angular abutment surface adjacent to each cutting edge at the top, and the front surface located between them, at least one inner abutment surface located entirely on one side of the transverse plane, and at least one inner abutment surface located completely on the opposite side of the transverse plane.

The disadvantage of the analogue is the complexity of manufacturing, since the cutting insert contains a large number of complex surfaces, and a low utilization rate of the material, since the insert contains only one cutting part.

Known analogue - cutting insert for threading - RU2106933, 09/07/1994, adopted as a prototype, having upper and lower sides, between which there are at least three side walls, and at least one cutting part in the form of a cutting triangular tooth protruding outward from the central portion of the insert, while said cutting tooth has two outwardly converging main cutting edges, which are connected to each other by an angular cutting edge, while said cutting edges are located in a downwardly inclined plane, and the front surface of said cutting tooth has a wedge-shaped protrusion located above relative to the top side of the plate, while the lateral sides of the specified wedge-shaped protrusion are located next to the specified main cutting edges and converge in an upward direction, while the front part of the wedge-shaped protrusion mates with the specified inclined plane in which the cutting edges are located, characterized in that the rear part indicates knitted wedge-shaped protrusion mates with the upper side of the plate, while the specified inclined plane is located at an angle of 5-15 ° to the horizontal plane.

The disadvantage of the prototype is that the geometry of the cutting part during threading does not provide a high purity of the machined threaded surface.

The technical result of the proposed utility model is to create a cutting insert for threading, which provides a high purity of the threaded surface during threading.

The technical result is achieved in a cutting insert for threading, having upper and lower surfaces parallel to each other, between which vertical side surfaces are located, there is a cutting part in the form of a cutting triangular tooth protruding outwardly relative to the side surface of the plate, while said cutting tooth has two converging outward, the main cutting edges, which are connected to each other by a radial cutting edge at the tip of the tooth, while these cutting edges are located in a plane inclined downward relative to the tooth tip, coinciding with the front surface of the cutting part of the insert, the rear surfaces of the cutting part of the insert, bounded from above by the cutting edges, are located at an angle of seven degrees relative to the vertical planes passing through the cutting edges.

Figure 1 shows a general view of a cutting insert for threading.

Figure 2 is a top view of a cutting insert for threading.

Fig. 3 is a side view of a cutting portion of a cutting insert for threading.

Figure 4 shows a section A-A of the cutting part of a cutting insert for threading.

Figure 5 shows the cutting part of the cutting insert with dimensions.

The cutting insert for threading has upper 1 and lower 2 surfaces parallel to each other, between which vertical side surfaces 3 are located, as shown in Fig. 1, there is a cutting part in the form of a cutting triangular tooth 4 protruding outward relative to the side surface 3 of the plate, when this said cutting tooth 4 has two outwardly converging main cutting edges 5, as shown in Fig. 2, which are interconnected by a radial cutting edge 6 at the apex of tooth 4, while said cutting edges 5 are located in a plane 7 inclined downward relative to the top of tooth 4 3, coinciding with the front surface of the cutting part of the insert, the rear surfaces 8 of the cutting part of the insert shown in FIGS. 1, 2, 4, bounded from above by the cutting edges 5, are located at an angle α of seven degrees, as shown in FIG. .4, relative to vertical planes 9 passing through the cutting edges 5.

Consider an example of a specific implementation of a cutting insert for threading. The plate is used as a cutting tool when processing the external right-hand thrust thread in accordance with GOST 10177-82 on a lathe. The insert has three cutting teeth 4 having the dimensions shown in FIG. 5. The height of the initial contour HA = 2.95 mm, the height from the apex of the triangle to the tip of the tooth to the cutting edge 6 HB = 0.62 mm. The rounding radii R are 0.25 mm. The insert is installed in the tool holder, resting on the bottom surface 2. After that, it is fixed with a screw through the hole 10. Threading is carried out by the cutting part - one of the cutting teeth 4. The triangular profile of the cutting tooth 4, consisting of cutting edges 5, 6, forms the thread profile. Processing is carried out in several passes. The cutter is used to cut threads with different pitch up to 2 mm. Angle α is the cutting clearance angle of the cutting end. Due to the fact that the rear surfaces 8 of the cutting part of the insert are located at an angle α of seven degrees, a high purity of the machined threaded surface is ensured. Achievement of the technical result is confirmed by practice using a cutting insert having the above design features and dimensions.

Claims (1)

A cutting insert for threading having upper and lower surfaces parallel to each other, between which vertical side surfaces are located, and a cutting part in the form of a cutting triangular tooth protruding outwardly relative to the side surface of the insert, while said cutting tooth has two outwardly converging main cutting edges , which are connected to each other by a radius cutting edge at the apex of the tooth, while these cutting edges are located in a plane inclined downward relative to the tooth apex coinciding with the front surface of the cutting part of the insert, characterized in that the rear surfaces of the cutting part of the insert, bounded from above by the cutting edges, are located at an angle of seven degrees relative to the vertical planes passing through the cutting edges.

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