CN102581353A - Designing and processing method of enveloped counter bit for titanium alloy - Google Patents

Abstract

The invention provides a processing method for skin countersinking of titanium alloys, which includes the following steps: ①Turning: Car forming, respectively turning the outer circle and inner hole of the skin countersinking of the opening according to the requirements of the drawing, and turning out the inner hole of 2° Taper, 1:50 taper holes leave a margin of 0.4~0.5, and the rest is turned to size; ②Special welding fixture for making blades; ③External grinding: According to the size of the inner hole of the open skin countersinking, the welding special fixture for roughly grinding the blade Outer circle; ④ Internal grinding: Fine grinding 1:50 taper hole to the required size; ⑤ Milling: According to the specifications of the blade, a milling cutter groove is equipped on the special welding fixture of the blade; ⑥ Fix the special welding fixture of the blade on the opening skin Countersinking; ⑦Welding the blade; ⑧Removing the special welding fixture for the blade. This design and processing method effectively solves the problem that the blade cannot be fixed and the phenomenon of adhesion occurs during the welding process of the skin countersink drill for titanium alloy, ensures the product quality, and reduces the production cost.

Description

Design and processing method of skin countersink for titanium alloy

technical field

The invention relates to a design and processing method of skin countersinking for titanium alloy, which is used for processing holes on titanium alloy skin parts.

Background technique

With the rapid development of the aerospace field, all-round improvement is required in the materials and mechanical properties of aircraft manufacturing, especially titanium alloy materials have been widely used in every link of aircraft parts processing.

Titanium alloy material is a new type of structural material. It has superior performance indicators and is increasingly widely used in aviation, aerospace, chemical, shipbuilding and other industrial sectors. The skin countersink for titanium alloy is used to process the holes on the titanium alloy skin parts. It is widely used in the aviation field. There are two main types of skin countersink, one is high speed steel Integral skin countersinking, one is skin countersinking with welded alloy blades. The former is relatively simple to process, but the production cost is relatively high. For mass production, it will cause a lot of waste. The latter is more difficult to process. The quality of products produced by this method is not easy to guarantee, but the production cost can be greatly reduced, so it is widely used in the processing of holes on skin parts.

Contents of the invention

The purpose of the present invention is to provide a design and processing method of skin countersinks for titanium alloys, which effectively solves the problem that the blade cannot be fixed and the phenomenon of adhesion during the welding process of titanium alloys skins countersinks, and ensures the product quality. quality and reduce production costs.

The technical solution created by the present invention: a skin countersink drill for titanium alloy, including a blade, a cutter body, a cutter bar and a positioning pin, the cutter body is fixed on the cutter rod through the positioning pin, and the blade is movably connected with the cutter body.

The blade is welded to the cutter body.

The processing method for skin countersinking of described titanium alloy comprises the following steps:

1) Turner: Turning into shape, turning the outer circle and inner hole of the opening skin countersink respectively according to the drawing requirements, and turning out 2° inner taper, leaving a margin of 0.4 to 0.5 for the 1:50 taper hole, and turning the rest to size;

2) Special welding fixture for making blades;

3) External grinding: According to the inner hole size of the open skin countersinking drill, the outer circle of the special welding fixture for rough grinding of the blade is used;

4) Internal grinding: fine grinding 1:50 taper hole to the required size.

5) Milling: According to the specifications of the blade, a milling cutter groove is equipped on the special welding fixture of the blade;

6) Fix the special welding fixture of the blade on the open skin countersink;

7) welding blade;

8) Remove the special welding jig for the blade.

The special welding fixture of the blade is in a "convex" shape and is made of 1Cr18Ni9Ti material. The size of the small end is consistent with the size of the taper hole, and the size of the large end is consistent with the size of the inner hole of the open skin countersink.

The rake angle γ of the blade is 0°, the relief angle α is 12°, the inclination angle β is 0°, the cogging angle θ is 60°, the bottom R is 1.5, the bevel angle δ is 10°, and the centripetal angle ε is 2°.

In the processing of the tool body of the skin countersink drill, the actual size of the inner hole is usually 0.5mm larger than the theoretical size of the inner hole; in the processing of the tapered hole at the end of the tool body of the skin countersink drill, it needs to be made according to the taper size value Special reamers and plug gauges are used for processing and measuring.

The cutter body of the skin countersink drill is provided with a through hole.

Beneficial effects created by the present invention:

1) The special welding fixture for this blade can solve the problem that the blade cannot be fixed during the welding process; this fixture is made of 1Cr18Ni9Ti material, which has low thermal conductivity, and even if the blade is welded well, the blade can still work well under high temperature Disassembly, and no adhesion occurs when the blade is welded, so the same cutter body and cutter holder can be used repeatedly, ensuring product quality and greatly reducing production costs.

2) The rake angle γ of the blade is 0°, the relief angle α is 12°, the inclination angle β is 0°, the cogging angle θ is 60°, and the bottom R is 1.5, which is convenient to eliminate during use Chips; the bevel angle δ is 10°, the purpose is to make the cutting smooth during the cutting process; the centripetal angle ε is 2°, and it is an inner reverse taper, which can reduce the friction during use and reduce the friction generated during the cutting process. heat, prolonging tool life.

3) In the processing of the tool body for skin countersinking, the actual size of the inner hole is usually 0.5mm larger than the theoretical size of the inner hole; in the processing of the tapered hole at the end of the tool body for skin countersinking, it is necessary to base on the taper size Value-making special reamers and plug gauges are used for processing and measuring, and this process method is used to better meet the production requirements.

4) There is a through hole on the body of the skin countersink drill, the purpose is to reduce the weight of the skin countersink drill and reduce the inner hole.

Description of drawings

Fig. 1 is the structural representation of the skin countersink for titanium alloy created by the present invention.

Fig. 2 is a schematic diagram of the structural relationship between the blade and the cutter body.

FIG. 3 is a side view of FIG. 1 .

Fig. 4 is an A-A sectional view in Fig. 2 .

Fig. 5 is a structural schematic diagram of the special welding fixture for the blade.

Detailed ways

As shown in Figure 1, the skin countersinking drill for titanium alloy includes a blade 2, a cutter body 1, a cutter bar 3 and a positioning pin. The cutter body 1 is fixed on the cutter bar 3 through the positioning pin, and the blade 2 is movably connected with the cutter body 1. .

As shown in FIGS. 2 to 4 , the blade 2 is welded to the cutter body 1 .

The processing method of skin countersinking for described titanium alloy comprises the following steps:

1) Turner: Turning into shape, turning the outer circle and inner hole of the opening skin countersink respectively according to the drawing requirements, and turning out 2° inner taper, leaving a margin of 0.4 to 0.5 for the 1:50 taper hole, and turning the rest to size;

2) Make a special welding fixture for blade 2;

3) External grinding: roughly grind the outer circle of the special welding fixture for blade 2 according to the inner hole size of the open skin countersink drill;

4) Internal grinding: fine grinding 1:50 taper hole to the required size;

5) Milling: According to the specifications of the blade 2, a milling cutter groove is equipped on the special welding fixture of the blade 2;

6) Fix the special welding fixture of the blade 2 on the open skin countersink;

7) welding blade 2;

8) Remove the special welding jig for blade 2.

As shown in Figure 5, the special welding fixture for the blade 2 is in the shape of a "convex" and is made of 1Cr18Ni9Ti material. The size of the small end is consistent with the size of the taper hole, and the size of the large end is consistent with the size of the inner hole of the open skin countersinking drill.

The rake angle γ of the blade 2 is 0°, the relief angle α is 12°, the inclination angle β is 0°, the cogging angle θ is 60°, the bottom R is 1.5, the bevel angle δ is 10°, and the centripetal angle ε is 2°.

In the processing of the tool body 1 of the skin countersinking drill, the actual size of the inner hole is usually 0.5mm larger than the theoretical size of the inner hole; in the processing of the tapered hole at the end of the tool body of the skin countersinking drill, it needs to be based on the taper size value Make special reamers and plug gauges for processing and measurement.

The cutter body 1 of the skin countersink drill is provided with a through hole.

Claims (7)

1. Skin countersink drill for titanium alloy, including blade (2), cutter body (1), cutter holder (3) and positioning pin, cutter body (1) is fixed on the cutter holder (3) through positioning pin, its characteristics In that: the blade (2) is flexibly connected with the cutter body (1). 2 . The skin countersink drill for titanium alloy according to claim 1 , characterized in that: the blade ( 2 ) is welded to the cutter body ( 1 ). 3. the processing method of skin countersinking for titanium alloy as claimed in claim 2, is characterized in that, comprises the following steps: 1) Turner: Turn into shape, turn the outer circle and inner hole of the opening skin countersink respectively according to the drawing requirements, and turn out 2° inner taper, leave a margin of 0.4 to 0.5 for the 1:50 taper hole, and turn the rest to size; 2) A special welding jig for making the blade (2); 3) External grinding: roughly grind the outer circle of the special welding fixture of the blade (2) according to the inner hole size of the open skin countersink; 4) Internal grinding: fine grinding 1:50 taper hole to the required size; 5) Milling: According to the specifications of the blade (2), a milling cutter groove is equipped on the special welding fixture of the blade (2); 6) Fix the special welding fixture of the blade (2) on the open skin countersink; 7) Welding blade (2); 8) Remove the special welding jig of the blade (2). 4. The processing method of skin countersinking for titanium alloys as claimed in claim 3, characterized in that: the special welding fixture of the blade (2) is in a "convex" shape, and is made of 1Cr18Ni9Ti material, and the size of the small end is the same as that of the cone The size of the hole is consistent, and the size of the big end is consistent with the size of the inner hole of the open skin countersink drill. 5. The processing method for skin countersinking of titanium alloys as claimed in claim 4, characterized in that: the rake angle γ of the blade (2) is 0°, the relief angle α is 12°, and the inclination angle β is 0 °, the cogging angle θ is 60°, the bottom R is 1.5, the bevel angle δ is 10°, and the centripetal angle ε is 2°. 6. The processing method of skin countersinking for titanium alloys as claimed in claim 5, characterized in that: in the processing of the cutter body (1) of skins countersinking, the actual size of the inner hole is usually larger than the theoretical size of the inner hole The size of the machine is 0.5mm larger; in the processing of the tapered hole at the end of the tool body of the skin countersink, it is necessary to make a special reamer and plug gauge according to the taper size value for processing and measurement. 7 . The method for processing a skin countersink for titanium alloy according to claim 6 , characterized in that: the body ( 1 ) of the skin countersink is provided with a through hole. 7 .

Images