Special cutter for machining U-shaped groove of thin-walled workpiece

Abstract

The invention relates to a special cutter for machining a U-shaped groove of a thin-wall part. The special cutter comprises a cutter main body, a fastening screw and a blade, a blade positioning clamping groove for mounting a blade is formed in the front end of the cutter main body; the blade positioning clamping groove comprises a supporting bottom face used for supporting the blade and V-shaped bosses used for positioning on the two sides, the blade is inserted into the blade positioning clamping groove, the tail end face of the blade makes contact with the supporting bottom face, and the V-shaped grooves in the upper side and the lower side of the blade are matched with the V-shaped bosses respectively. The fastening screw is installed at the front end of the cutter body so that the blade can be clamped by the two sides of the blade positioning clamping groove. The tool is suitable for machining U-shaped end face arc grooves of various thin-walled parts, rigidity of a tool system is improved, machining quality is guaranteed, and production efficiency is improved. The cutter solves the problem of machining of the arc groove in the U-shaped end face of the thin-walled workpiece.

Description

Technical Field

[0001] The invention belongs to the field of processing technology, and in particular relates to a special tool for processing a U-shaped groove of a thin-walled part. Background Art

[0002] Titanium alloy thin-walled parts have high overall strength, light weight and beautiful appearance, so they are widely used in engineering, especially in the automotive, aerospace and other industrial fields. Due to the structural characteristics of poor rigidity of thin-walled parts, they are prone to processing deformation under the influence of various factors such as cutting force, cutting heat and clamping force. At the same time, titanium alloy has poor thermal conductivity. During the cutting process, the surface temperature of the processing part rises rapidly. The high surface temperature will aggravate the wear of the tool, making it difficult to guarantee the size and technical requirements of the processed parts. In addition, the existing standard arc tool interference cannot avoid the interference between the U-shaped end face arc groove and the first reinforcing rib, such as Figure 6 shown. Summary of the invention

[0003] The technical problem to be solved by the present invention is: In order to solve the above technical problem, the present invention provides a tool that can process the U-shaped flanging structure of thin-walled parts to solve the problem of processing the hook with a U-shaped end face arc groove with a wall thickness of 0.15-2mm.

[0004] The technical solution adopted by the present invention is: a special tool for processing U-shaped grooves of thin-walled parts, comprising: a tool body, a fastening screw and a blade; a blade positioning slot for installing the blade is arranged at the front end of the tool body; the blade positioning slot comprises a supporting bottom surface for supporting the blade and V-shaped bosses on both sides for positioning, the blade is inserted into the blade positioning slot, the rear end surface of the blade contacts the supporting bottom surface, and the V-shaped grooves on both sides of the blade respectively match the V-shaped bosses; the fastening screw is installed at the front end of the tool body to clamp the blade on both sides of the blade positioning slot.

[0005] Furthermore, the front end of the tool body is provided with an oblique slit in the longitudinal direction starting from the supporting bottom surface of the blade positioning slot, and the width of the oblique slit is 0.5-0.55 mm. After the fastening screw is installed, the oblique slit is pressed to clamp the two sides of the blade positioning slot.

[0006] Furthermore, the angles of the V-shaped grooves on both sides of the blade are 30° to 35°.

[0007] Furthermore, the blade is "L" shaped, with a length of 19 to 20 mm, a blade head width of 5.5-5.6 mm, a width of 4 to 4.05 mm at the tail positioning point, a height of 9.9 to 10 mm, an arc-shaped front end, and a fillet radius R of 2 to 3 mm.

[0008] Furthermore, the front angle of the blade is 13° to 15°, the back angle is 7° to 10°, the side angle of the cutter head is 73° to 75°, and the side back angle of the blade is 2.8° to 3°.

[0009] Furthermore, the length of the portion where the blade positioning slot cooperates with the blade is 17-18 mm, the width is 4-4.05 mm, and the height is 10-10.05 mm.

[0010] Furthermore, the blade is made of cemented carbide and has a TiAIN coating with a thickness of 4 to 4.5 μm.

[0011] Furthermore, the tool body material is tool steel.

[0012] The advantages of the present invention compared with the prior art are:

[0013] (1) The present invention provides a special tool for processing U-shaped grooves of thin-walled parts, which is mainly used for processing U-shaped end face arc grooves of titanium alloy thin-walled parts of key parts of aerospace liquid rocket engines and weapon attitude control engines, and is suitable for CNC lathes with front tool holders and rear tool holders. At the same time, it solves the difficulty of interference between the U-shaped end face arc groove and the reinforcing ribs, and the problem of deformation of thin-walled parts affected by cutting force, ensuring product quality, improving production efficiency, and effectively reducing labor intensity.

[0014] (2) The tool of the present invention has a simple and compact structure. When the blade is worn or chipped, only a new blade needs to be replaced, which avoids the scrapping of the tool body and reduces the cost of the tool. The tool of the present invention is reliably and firmly positioned on the machine tool turret with high positioning accuracy. The blade is installed in the blade positioning slot, which is convenient for clamping and replacement, and has high positioning accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the exploded view of the tool;

[0016] Figure 2 This is an exploded view of the tool from another angle;

[0017] Figure 3 It is a top view of the blade;

[0018] Figure 4 is a schematic diagram of the three-dimensional structure of the blade;

[0019] Figure 5 Schematic diagram of blade angle;

[0020] Figure 6 This is a schematic diagram of blade processing;

[0021] Figure 7 This is the main view of the tool;

[0022] Figure 8 It is the top view of the tool;

[0023] Fig. 9 This is the left view of the tool. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with specific implementations.

[0025] like Figures 1 to 9 As shown, the present invention relates to a special tool for processing U-shaped grooves of thin-walled parts, which mainly involves a tool body 1, a fastening screw 2, a blade positioning slot 3, and a blade 4. The front end of the tool body 1 is provided with a blade positioning slot 3 for positioning and connecting the blade 4. The rear end of the tool body 1 is provided with a rectangular parallelepiped structure for positioning and fastening on a machine tool tool holder. The tool is installed on the machine tool tool holder, and the tool body is parallel to the axis of the machine tool spindle.

[0026] The front end of the tool body 1 is provided with a blade positioning slot 3 for installing the blade, the front end of the cutter head is provided with a main back angle, and the cutter head is provided with a cutter head side angle when viewed from a top view. V-shaped grooves 41 are provided on both sides of the blade 4 to match the V-shaped bosses 32 on the blade positioning slot 3 on the tool body 1. The front end of the blade 4 is provided with an arc, and the blade 4 is pressed by the fastening screw 2 and the cutter body thread connection. The blade positioning slot 3 includes a supporting bottom surface 31 for supporting the blade and V-shaped bosses 32 on both sides for positioning. The blade 4 is inserted into the blade positioning slot 3, and the tail end surface of the blade 4 contacts the supporting bottom surface 31. The V-shaped grooves 41 on both sides of the blade 4 are respectively matched with the V-shaped bosses 32; the fastening screw 2 is installed at the front end of the tool body 1, so that the blade 4 is clamped on both sides of the blade positioning slot 3. The bottom of the front end of the blade is provided with an arc surface that enhances rigidity and effectively avoids the range. It is suitable for processing U-shaped end face arc grooves of various thin-walled parts, which increases the rigidity of the tool system, ensures processing quality, and improves production efficiency.

[0027] The front end of the tool body 1 is longitudinally provided with an oblique slit 11 starting from the supporting bottom surface of the blade positioning slot 3. The width of the oblique slit 11 is 0.5-0.55 mm. After the fastening screw 2 is installed, the oblique slit is pressed to clamp the two sides of the blade positioning slot 3.

[0028] The blade 4 is "L" shaped, with a length of 19-20 mm, a blade head width of 5.5-5.6 mm, a width of 4-4.05 mm at the tail positioning, a height of 9.9-10 mm, an arc-shaped front end, and a fillet radius R of 2-3 mm.

[0029] The length of the portion of the blade positioning slot 3 that cooperates with the blade is 17-18 mm, the width is 4-4.05 mm, and the height is 10-10.05 mm.

[0030] The angle of the V-shaped groove 41 on the upper and lower sides of the blade is 30°-35°.

[0031] The blade is a non-standard arc blade with a front angle of 13°-15°, a back angle of 7°-10°, a cutter head side angle of 73°-75°, and a blade side back angle of 2.8°-3°.

[0032] The blade 4 is made of cemented carbide and is coated with TiAIN with a thickness of 4-4.5 μm.

[0033] The tool body 1 is made of tool steel.

[0034] The special tool of the invention can process the U-shaped end face circular arc groove of thin-walled parts with a wall thickness in the range of 0.15-2mm and can process the U-shaped end face circular arc groove of thin-walled parts with a diameter in the range of D200-500mm.

[0035] The above is only the best specific solution of the present invention. Any changes, modifications or substitutions that can be easily thought of by any technician familiar with the technical field should be covered within the protection scope of the present invention.

Claims

1. A special tool for processing U-shaped grooves of thin-walled parts, characterized in that: include: A tool body (1), a fastening screw (2) and a blade (4); a blade positioning slot (3) for mounting the blade (4) is arranged at the front end of the tool body (1); the blade positioning slot (3) comprises a supporting bottom surface (31) for supporting the blade and V-shaped bosses (32) on both sides for positioning; the blade (4) is inserted into the blade positioning slot (3), the rear end surface of the blade (4) contacts the supporting bottom surface (31), and the V-shaped grooves (41) on both sides of the blade (4) respectively match the V-shaped bosses (32); the fastening screw (2) is installed at the front end of the tool body (1) so that the blade (4) is clamped on both sides of the blade positioning slot (3).

2. A special tool for machining U-shaped grooves of thin-walled parts according to claim 1, characterized in that: The front end of the tool body (1) is provided with an oblique slit (11) in the longitudinal direction starting from the supporting bottom surface (31) of the blade positioning slot (3); after the fastening screw (2) is installed, the oblique slit (11) is pressed to clamp the two sides of the blade positioning slot (3).

3. A special blade for processing thin-walled parts of liquid rocket engines according to claim 2, characterized in that: The width of the oblique slit (11) is 0.5-0.55 mm.

4. A special tool for machining U-shaped grooves of thin-walled parts according to claim 3, characterized in that: The angles of the V-shaped grooves on both sides of the blade (4) are 30° to 35°.

5. A special tool for machining U-shaped grooves of thin-walled parts according to claim 4, characterized in that: The blade (4) is L-shaped, with a length of 19-20 mm, a blade head width of 5.5-5.6 mm, a width of 4-4.05 mm at the tail positioning part, a height of 9.9-10 mm, a front end in an arc shape, and a fillet radius R of 2-3 mm.

6. A special tool for machining U-shaped grooves of thin-walled parts according to claim 1, characterized in that: The front angle of the blade is 13° to 15°, the back angle is 7° to 10°, the side angle of the cutter head is 73° to 75°, and the side back angle of the blade is 2.8° to 3°.

7. The special tool for machining U-shaped grooves of thin-walled parts according to claim 1, characterized in that: The length of the portion of the blade positioning slot (3) that cooperates with the blade is 17-18 mm, the width is 4-4.05 mm, and the height is 10-10.05 mm.

8. The special tool for machining U-shaped grooves of thin-walled parts according to claim 1, characterized in that: The blade (4) is made of hard alloy and has a TiAIN coating with a thickness of 4 to 4.5 μm.

9. The special tool for machining U-shaped grooves of thin-walled parts according to claim 1, characterized in that: The tool body (1) is made of tool steel.

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