A replaceable head type end face groove turning tool and a machining method thereof

Abstract

The application belongs to the technical field of aviation manufacturing, and discloses a replaceable head type end face groove turning tool and a machining method thereof. The turning tool adopts a sectional structure design and comprises a replaceable head, a transition section and a tool shank. The head is a replaceable structure, the transition section is welded with the tool shank to form a tool body, and the head and the tool body are both formed by wire cutting. During use, the head is inserted into an arc-shaped through slot, and the turning tool holder baffle is pressed to tightly install the turning tool. During the machining process, when the head is worn, the head is only needed to be replaced, and the above installation process is repeated to continue using the turning tool. The machining process property is fully considered in the structural design, the risk of head fracture in the manufacturing and using process is effectively reduced, and the turning tool has the advantages of reducing machining difficulty, improving production efficiency, prolonging tool life and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing in aviation manufacturing, and particularly relates to a replaceable head type end face groove turning tool and a processing method thereof. BACKGROUND

[0002] The traditional tool for processing the annular end face groove is of a whole structure, and the following problems exist in the manufacturing and use of the tool: 1. In order to ensure the toughness of the tool, high-speed steel is generally used, the tool head is narrow, and stress concentration exists at the root of the tool head after heat treatment, which cannot be completely eliminated, and the tool is easily broken during the removal of the allowance in the sharpening stage, the sharpening is difficult, and the yield is low. 2. When the tool is fed by the straight feeding method, the tool vibration is large, the whole tool structure is easy to cause the root of the tool head to be broken, and the bottom of the ring groove of the part is damaged, causing product quality problems. 3. Once the tool is worn or broken during the processing and use, it needs to be re-manufactured, the processing cost is high, the manufacturing cycle is long, and the processing cycle is affected.

[0003] Therefore, the application designs a replaceable head type end face groove turning tool for processing a small diameter circular ring end face groove. Through the replaceable head type design, the original whole structure is changed into an assembled structure, the risk of tool head breakage during manufacturing and use is effectively reduced, at the same time, the processing technology is simplified through wire cutting, welding and other processing methods, and the tool has the characteristics of improving the yield and processing efficiency, prolonging the tool life and the like. SUMMARY

[0004] The application provides a replaceable head type end face groove turning tool and a processing method thereof, which can meet the requirements of economic affordability, high processing efficiency and long tool life while meeting the processing of the end face ring groove of a rotary body.

[0005] In order to achieve the above-mentioned application purposes, the technical scheme adopted by the application is as follows:

[0006] A replaceable head type end face groove turning tool adopts a segmented structure design, and comprises:

[0007] a tool handle;

[0008] a transition section fixedly connected with the tool handle, which is provided with an arc-shaped through groove;

[0009] a replaceable tool head inserted into the arc-shaped through groove.

[0010] As a further scheme of the application, the replaceable tool head is of an arc-shaped structure with a wide top end and a narrow lower end, the cutting edge of the replaceable tool head is composed of a main cutting edge and two auxiliary cutting edges, the front edge is the main cutting edge, and the two side edges are the auxiliary cutting edges.

[0011] As a further scheme of the present application: the transition section is provided with an arc-shaped through groove, which is located at the upper right corner as a starting point, and ensures that the arc-shaped through groove is matched with the replaceable tool head with a manufacturing tolerance of 0.02mm-0.04mm.

[0012] As a further scheme of the present application: the main cutting edge is composed of a 10-15° rake face and an 8-12° relief face, and a 16-20° second relief face is designed at a position of 4mm of the relief face to reduce friction.

[0013] As a further scheme of the present application: the auxiliary cutting edge is composed of a rake face and two arc-shaped sides of the tool head, and the arc-shaped sides are designed with unequal diameters, and the arc-shaped sides are designed by offsetting the centers, the inner arc-shaped side is formed by offsetting the center downward, and the outer arc-shaped side is formed by offsetting the center upward, and the offsetting process automatically generates the side relief angles of the two arc-shaped sides of the tool head.

[0014] As a further scheme of the present application: the inner arc-shaped side and the outer arc-shaped side should not protrude from the width dimension of the main cutting edge, and if they protrude, the central angles of the two sides should be ground to avoid the risk of clamping the tool.

[0015] As a further scheme of the present application: the replaceable tool head and the arc-shaped through groove of the transition section are machined by wire cutting, and the transition section and the tool shank are connected by welding.

[0016] A replaceable tool head type end face groove turning tool machining method, which comprises the following steps:

[0017] In the machining process, the arc-shaped through groove of the replaceable tool head and the transition section is first machined by wire cutting;

[0018] The transition section and the tool shank are welded, and the four sides of the tool body are milled to ensure that the intersection line of the outer side cutting edge and the top surface and the outer side surface of the tool body is located on the same straight line after the replaceable tool head is installed.

[0019] Finally, the heat treatment and the finishing processes such as flat grinding and sharpening are completed.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] 1. The present application designs a replaceable tool head type end face groove turning tool from a traditional integral end face groove turning tool, which effectively prolongs the service life of the tool.

[0022] 2. The present application designs a replaceable tool head type end face groove turning tool from a traditional integral end face groove turning tool, which effectively prolongs the service life of the tool.

[0023] 3. The present application connects the tool head and the transition section by assembling, which effectively avoids the stress concentration phenomenon of the tool head after heat treatment, reduces the risk of tool head fracture during use, and reduces the manufacturing cost.

[0024] The present application will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0026] In the attached diagram:

[0027] Figure 1 This is a schematic diagram of the overall structure of the cutting tool of the present invention;

[0028] Figure 2 This is a schematic diagram of the replaceable cutter head structure of the present invention;

[0029] Figure 3 This is a right view of the tool structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the transition section structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the workpiece being processed according to the present invention;

[0032] Figure 6 This is a schematic diagram of the segmented manufacturing process of the cutting tool of the present invention.

[0033] In the diagram: 1-Replaceable cutter head; 2-Transition section; 3-Tool holder; 4-Weld; 5-Main cutting edge; 6-Secondary cutting edge; 7-Rake angle face; 8-Relief angle face; 9-Second relief angle face; 10-Arches on both sides of the cutter head; 11-Positioning starting point; 12-Outer cutting tip; 13-Intersection line of the top and outer sides of the tool body. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] Firstly, such as Figures 1-4 As shown, this invention provides a replaceable-head end-face grooving turning tool, employing a segmented structural design. The first segment is a replaceable cutting head 1, the second segment is a transition section 2 connecting the cutting head and the tool holder, and the third segment is a tool holder 3 that mates with and is positioned in conjunction with the lathe tool post. The transition section and the tool holder are welded together to form the tool body. In use, the cutting head is inserted into the arc-shaped through groove and secured with the tool post baffle for a secure installation. During machining, if the cutting head becomes worn, simply replace the cutting head and repeat the above installation process to continue use.

[0036] Further, the replaceable head 1 is an arc structure with wide top and narrow bottom, and the cutting edge of the head is composed of a main cutting edge 5 and two auxiliary cutting edges 6, the front edge is the main cutting edge, and the two side edges are the auxiliary cutting edges.

[0037] Further, the main cutting edge 5 is composed of a 10-15° rake face 7 and an 8-12° relief face 8, and a 16-20° second relief face 9 is designed at the position of 4 mm of the relief face to reduce friction.

[0038] Further, the auxiliary cutting edge 6 of the head is composed of the rake face 7 and two side arcs 10 of the head, and the two side arcs are designed by offsetting the centers, the inner arc is formed by offsetting the center downward, the outer arc is formed by offsetting the center upward, and the side relief of the two sides of the head is automatically generated in the offsetting process. The inner arc and the outer arc of the head should not protrude from the width dimension of the main cutting edge, and if they protrude, the center angle of the two sides should be ground to avoid the risk of clamping the tool.

[0039] Further, the transition section 2 is provided with an arc-shaped through groove with the right upper corner of the tool body as the positioning starting point 11, and the arc-shaped through groove is gap-fitted with the replaceable head, and the manufacturing tolerance is generally 0.02 mm-0.04 mm.

[0040] Further, the intersection line 13 between the outer side tool tip 12 of the replaceable head 1 after installation and the top surface and the outer surface of the tool body is located on the same straight line, which is convenient for machining positioning.

[0041] Further, the replaceable head 1 and the arc-shaped through groove of the transition section 2 are machined by wire cutting, the transition section 2 and the tool body 3 are connected by welding, and 4 is the welding seam.

[0042] In a second aspect, the application provides a machining method of the replaceable head type end face groove turning tool, which comprises the following machining steps:

[0043] S1, in the machining process, the arc-shaped through groove of the head and the transition section is first machined by wire cutting;

[0044] S2, the transition section and the tool shank are welded, and the four sides of the tool body are milled to ensure that the intersection line 13 between the outer side tool tip 12 of the replaceable head 1 after installation and the top surface and the outer surface of the tool body is located on the same straight line;

[0045] S3, finally, the heat treatment and the finishing processes such as flat grinding and edge grinding are completed.

[0046] The specific machining steps are as follows:

[0047] Prepare three high-speed steel rod materials to complete rough turning, which correspond to the replaceable head 1, the transition section 2 and the tool shank 3 respectively.

[0048] The replaceable tool head is processed in shape by wire cutting; the transition section is processed only with arc-shaped through slot by wire cutting, and the cylindrical shape is reserved;

[0049] The transition section and the shank are flash butt welded to form the tool body;

[0050] The tool body is milled into a square structure (the starting point is the slot, and the single side is left with 0.5mm allowance);

[0051] The tool body and the tool head 1 are quenched, tempered, sandblasted and surface treated;

[0052] The square tool body is ground to ensure that the intersection line 13 between the outside tool tip 12 and the top surface and the outside surface of the tool body is located on the same straight line after the installation of the replaceable tool head 1;

[0053] The edge angle face, the back angle face, the second back angle face and the two side central angles of the tool head 1 are precisely processed.

[0054] Thus, the purpose of the present application is achieved.

[0055] The above is only a preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tool bit changeable end face groove turning tool, which is designed in a sectional structure, characterized in that, It includes: A shank; A transition section fixedly connected with the shank, which is provided with an arc-shaped through slot; A replaceable tool bit inserted into the arc-shaped through slot; The replaceable tool bit is in an arc-shaped structure with a wide top end and a narrow bottom end, and the cutting edge of the replaceable tool bit is composed of a main cutting edge and two pairs of cutting edges, the front edge being the main cutting edge and the two side edges being the pairs of cutting edges; The transition section is provided with the arc-shaped through slot with its upper right corner as the positioning starting point to ensure the clearance fit between the arc-shaped through slot and the replaceable tool bit, and the manufacturing tolerance is 0.02mm-0.04mm; The main cutting edge is composed of a 10-15° rake face and an 8-12° relief face, and a 16-20° second relief face is designed at the position of 4mm of the relief face to reduce friction; The pair of cutting edges is composed of a rake face and two side arcs of the tool bit, and unequal diameter arc design is adopted to design the two side arcs of the tool bit, the inner arc is formed by offsetting the center of the circle downward, and the outer arc is formed by offsetting the center of the circle upward, and the offset process automatically generates the two side reliefs of the tool bit; The inner arc and the outer arc should ensure that they do not protrude from the width dimension of the main cutting edge, and if they protrude, the central angle of the two sides needs to be ground to avoid the risk of clamping the tool; The replaceable tool bit and the arc-shaped through slot of the transition section are processed by wire cutting, and the transition section and the shank are connected by welding.

2. A method of machining a replaceable tip face grooving turning tool according to claim 1, characterized in that It includes the following steps: The outer shape of the replaceable tool bit and the arc-shaped through slot of the transition section are processed by wire cutting; The transition section and the shank are welded; The welded tool body is milled to form a square structure, and the intersection line between the outer side tool tip and the top surface and the outer surface of the tool body after the installation of the replaceable tool bit is located on the same straight line; Finally, the heat treatment and the flat grinding and sharpening finishing processes are completed.

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