A drill-reamer internally cold forming tool for machining automobile parts

Abstract

The present invention belongs to the technical field of cutting tools, and in particular, relates to a drill-reamer integrated cold forming tool for processing automotive parts, comprising a drilling section, a clearance section, a reaming section and a clamping section connected in sequence, and all four are cylindrical, the diameters of the drilling section, the clearance section and the reaming section are the same, and the diameters of the three are all smaller than the diameter of the clamping section; the drilling section comprises a drill tip and a cutting section, and the drill tip is in a mountain shape, a transverse blade is arranged on the drill tip, and two main cutting edges extending toward the outer wall of the cutting section are arranged at both ends of the transverse blade. The present invention ensures the roughness of the hole wall of the valve plate workpiece after reaming by designing the spiral reaming blade as a double-guide structure, and the design of the larger first and second clearance angles increases the clearance of the back tool face while reducing the generation of aluminum alloy processing heat, inhibiting the formation of aluminum alloy flanging and burr damage, and improving the processing quality.

Description

Technical Field

[0001] The invention belongs to the technical field of cutting tools, and in particular relates to a drill-reamer integrated internally cold-formed tool for machining automobile parts. Background Art

[0002] In the process of machining automobile parts, it is often necessary to use machine tools to cut or drill the parts. For example, when producing automobile valve plates, it is necessary to use a drill bit to drill the specified through holes on the surface of the parts. The existing drilling tools use an integrated tool in the form of a combination of an ordinary drill tip drill bit and a straight groove reamer. Therefore, when facing valve plates with high drilling accuracy and position accuracy, the existing tools have poor drilling accuracy and straightness, and are prone to burrs during the machining process. In addition, the chip breaking and chip removal effects of the straight groove reamer are also poor, which affects the machining quality of the valve plate.

[0003] In addition, since the number of holes that need to be drilled on the valve plate is generally large, the drill tool is easily damaged due to high temperature during the long drilling process. Although cooling water is sprayed on the outside of the tool to cool it down in the existing processing process, for tools with larger diameters, the heat accumulated inside is not easy to dissipate during the long drilling process, which may also cause damage to the tool.

[0004] Therefore, it is necessary to invent a drill-reamer integrated cold forming cutter for automobile parts processing to solve the above problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a drill-reamer integrated cold forming tool for machining automobile parts to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a drill-reamer integrated cold forming tool for machining automobile parts, comprising a drilling section, a gap avoidance section, a reaming section and a clamping section connected in sequence, and all four are cylindrical, the diameters of the drilling section, the gap avoidance section and the reaming section are the same, and the diameters of the three are all smaller than the diameter of the clamping section;

[0007] The drilling section comprises a drill tip and a cutting portion, and the drill tip is in a mountain shape. A chisel edge is arranged on the drill tip, and two main cutting edges extending toward the outer wall of the cutting portion are arranged at both ends of the chisel edge. The outer wall of the cutting portion is provided with a secondary cutting edge and a spiral drilling chip removal groove;

[0008] The outer wall of the reaming section is unequally distributed with spiral reaming blades in the circumferential direction, and both ends of each spiral reaming blade extend to the avoidance section and the clamping section respectively, and a spiral reaming chip removal groove is formed between two adjacent spiral reaming blades.

[0009] Furthermore, the main cutting edge adopts a double-vertex structure, and the main cutting edge includes a first cutting edge and a second cutting edge, the first cutting edge is arranged between the transverse edge and the second cutting edge, the angle between the first cutting edge and the central axis of the drill tip is α1, and α1 is 50~60°, the angle between the second cutting edge and the central axis of the drill tip is α2, and α2 is 90°; the helix angle of the secondary cutting edge is β, and β is 25~35°.

[0010] Furthermore, the reaming section 3 is generally designed as an unequally divided groove type with 4 to 6 blades, and the unequally divided angles are staggered at 88° to 92°. The groove type is designed to be left-handed and right-handed, and is designed for forward chip removal. The helix angle of the reaming chip removal groove 32 is α3, and α3 is 7° to 15°.

[0011] Furthermore, the spiral reaming blade 31 is divided into a guiding front angle and a guiding clearance angle according to a double guiding structure design, the guiding front angle is α4, and α4 is 7° to 12°, the guiding clearance angle includes a first clearance angle and a second clearance angle, the first clearance angle is α5, and α5 is 8° to 12°, and the second clearance angle is α6, and α6 is 30° to 45°.

[0012] Furthermore, a first cooling channel is provided at the axis center of the free end of the clamping section, and the first cooling channel sequentially penetrates the clamping section, the reaming section and the air avoidance section, a plurality of first water outlet holes connected with the first cooling channel are provided in the reaming chip removal groove, a second cooling channel is provided at the bottom end of the first cooling channel, a plurality of second water outlet holes connected with the second cooling channel are provided in the drilling chip removal groove, and a guide component is provided in the first cooling channel and the second cooling channel, a plurality of liquid inlet holes are provided on the side wall of the clamping section, a water inlet pipe is rotatably sleeved on the clamping section, and the water inlet pipe is connected with the plurality of liquid inlet holes, a grinding ring is slidably sleeved on the outer side of the reaming section, a fixing ring is provided on the top of the grinding ring, the fixing ring is slidably sleeved at a position close to the top of the reaming section, a plurality of connecting rods are vertically fixedly connected between the fixing ring and the grinding ring, a compression spring is fixedly connected to the top of the fixing ring, the compression spring is slidably sleeved on the reaming section, and the top of the compression spring is in contact with the bottom end of the clamping section.

[0013] Furthermore, the guide assembly includes a hollow guide rod, which is inserted into the first cooling channel, and the bottom end of the guide rod is inserted into the second cooling channel, and the outer diameter of the guide rod matches the inner diameter of the second cooling channel, and the top of the guide rod is fixedly connected with a threaded head, the sum of the lengths of the guide rod and the threaded head matches the length of the first cooling channel, and the threaded head is threadedly connected to the open end of the first cooling channel, and a cylindrical block is fixedly sleeved on the guide rod, and the diameter of the block matches the inner diameter of the first cooling channel, and the side walls of the guide rod are symmetrically penetrated by two first strip-shaped through holes and two second through holes at the top and bottom of the block, the height of the first through hole is opposite to the height of the clamping section, and the height of the second through hole is opposite to the height of the reaming section. Relative to the degree, the bottom end of the guide rod is designed to be open, and a pull rod is slidably inserted at the bottom end of the guide rod, the bottom end of the pull rod is fixedly connected with a sealing column matching the diameter of the second cooling channel, the top of the pull rod is fixedly connected with a fixing rod, the two ends of the fixing rod are respectively inserted into the two second through holes, the guide rod is located at the bottom of the block and is slidably sleeved with a movable sleeve, the two ends of the fixing rod are fixedly connected to the inner wall of the movable sleeve through the two second through holes, the outer diameter of the movable sleeve matches the inner diameter of the first cooling channel, the inner diameter of the movable sleeve matches the outer diameter of the guide rod, locking rods are vertically inserted at positions near the top on both sides of the movable sleeve, two strip-shaped limiting holes are symmetrically opened on the side of the clamping section, and the two locking rods are respectively threaded through the two limiting holes and inserted into the fixing ring.

[0014] Furthermore, in the initial state, the top end of the sealing column is located outside the guide rod, and the length of the sealing column is the same as the length of the reaming section and the length of the limiting hole.

[0015] Furthermore, a plurality of rubber sealing rings are fixedly sleeved on the surface of the blocking block, and the rubber sealing rings are fitted together with the inner wall of the first cooling channel.

[0016] Furthermore, the length of the movable sleeve is greater than the length of the second through hole, and in an initial state, the bottom of the second through hole is flush with the bottom of the movable sleeve.

[0017] Technical effects and advantages of the present invention:

[0018] 1. The present invention ensures the roughness of the hole wall of the valve plate workpiece after reaming by designing the spiral reaming blade as a double-guide structure. The design of the larger first clearance angle and the second clearance angle increases the clearance of the back tool surface, reduces the generation of aluminum alloy processing heat, inhibits the formation of aluminum alloy flanging and burr damage, and improves the processing quality;

[0019] 2. The present invention designs the main cutting edge as a double-vertex structure, so that it can play a good role in centering, and it is not easy to have burrs at the broken hole of the product. The smaller angle α1 of the first cutting edge ensures the rigidity of the cutting edge, and the larger angle α2 of the second cutting edge improves the sharpness of the cutting edge when processing aluminum alloy. The larger back face of the secondary cutting edge avoids air, which can effectively reduce the heat generation during the workpiece processing process. The helix angle of the secondary cutting edge ensures the effective discharge of chips during the drilling process;

[0020] 3. The present invention is provided with a flow guide component. In the process of cooling the tool by cooling water, since the cooling water is sprayed outward from the inside of the tool, it is possible to effectively avoid heat accumulation inside the tool and improve the heat dissipation effect of the tool. In addition, in different processing stages, the cooling water can be targeted to cool the position of the tool and the workpiece processing, thereby improving the cooling efficiency and effect of the cooling water on the tool and avoiding damage to the tool due to high temperature.

[0021] 4. The present invention is provided with a grinding ring. During the process of fine reaming of the hole wall by the reaming section, when the surface of the workpiece contacts the bottom of the grinding ring, the grinding ring can grind the edge of the drilled hole against the top of the workpiece under the action of the pressure of the compression spring, thereby making the position of the top edge of the drilled hole smoother and avoiding the generation of burrs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the drilling section, the air-avoiding section, the reaming section and the clamping section in the present invention;

[0024] Figure 3 is an overall cross-sectional view of the present invention;

[0025] Figure 4 is a three-dimensional cross-sectional view of the flow guide assembly of the present invention;

[0026] Figure 5 The present invention Figure 4 A magnified view of part A;

[0027] Figure 6 It is a three-dimensional schematic diagram of the guide rod, the blocking block and the threaded head in the present invention;

[0028] Figure 7 is a schematic diagram of the chisel edge of the drill tip of the present invention;

[0029] Figure 8 is a schematic diagram of a drilling section in the present invention;

[0030] Fig. 9is a schematic diagram of a reaming section in the present invention;

[0031] Fig.10 It is a cross-sectional schematic diagram of the reaming section in the present invention.

[0032] In the figure: 1, drilling section; 11, transverse edge; 111, main cutting edge; 1111, first blade; 1112, second blade; 112, secondary cutting edge; 12, drilling chip groove; 2, air avoidance section; 3, reaming section; 31, spiral reaming blade; 32, reaming chip groove; 4, clamping section; 5, first cooling channel; 6, first water outlet; 7, second cooling channel; 8, second water outlet; 9, liquid inlet; 10, water inlet pipe; 13, grinding ring; 14, fixing ring; 15, connecting rod; 16, compression spring; 17, guide rod; 18, threaded head; 19, blocking block; 20, first through hole; 21, second through hole; 22, pull rod; 23, sealing column; 24, fixing rod; 25, movable sleeve; 26, locking rod; 27, limit hole; 28, rubber sealing ring. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0034] The present invention provides Figures 1 to 10 The drill-reamer integrated cold forming tool for automobile parts processing shown in the figure comprises a drilling section 1, a gap avoidance section 2, a reaming section 3 and a clamping section 4 which are connected in sequence, and the four sections are all cylindrical, and the diameters of the drilling section 1, the gap avoidance section 2 and the reaming section 3 are the same, and the diameters of the three sections are all smaller than the diameter of the clamping section 4;

[0035] The drilling section 1 comprises a drill tip and a cutting portion, and the drill tip is in a mountain shape. A chisel edge 11 is arranged on the drill tip, and two main cutting edges 111 extending toward the outer wall of the cutting portion are arranged at both ends of the chisel edge 11, and a secondary cutting edge 112 and a spiral drilling chip removal groove 12 are arranged on the outer wall of the cutting portion;

[0036] The outer wall of the reaming section 3 is unequally distributed with spiral reaming blades 31 in the circumferential direction, and both ends of each spiral reaming blade 31 extend to the avoidance section 2 and the clamping section 4 respectively, and a spiral reaming chip removal groove 32 is formed between two adjacent spiral reaming blades 31.

[0037] The main cutting edge 111 adopts a double-vertex structure, and the main cutting edge 111 includes a first cutting edge 1111 and a second cutting edge 1112. The first cutting edge 1111 is arranged between the chisel edge 11 and the second cutting edge 1112. The angle between the first cutting edge 1111 and the central axis of the drill tip is α1, and α1 is 50-60°. The angle between the second cutting edge 1112 and the central axis of the drill tip is α2, and α2 is 90°. The helix angle of the secondary cutting edge 112 is β, and β is 25-35°.

[0038] The mountain-shaped drill tip can play a good centering role and is not prone to burrs at the hole. The smaller angle α1 of the first cutting edge 1111 ensures the rigidity of the cutting edge. The larger angle α2 of the second cutting edge 1112 improves the sharpness of the cutting edge when processing aluminum alloy. The larger back face of the auxiliary cutting edge 112 can effectively reduce the heat generation during the workpiece processing. The helix angle of the auxiliary cutting edge 112 ensures the effective discharge of chips during the drilling process.

[0039] The reaming section 3 is generally designed as an unequally divided groove type with 4 to 6 blades, and the unequally divided angles are staggered at 88° to 92°. The groove type is designed to be left-handed and right-handed, and the chip removal is designed to be forward. The helix angle of the reaming chip removal groove 32 is α3, and α3 is 7° to 15°.

[0040] The spiral reaming blade 31 is divided into a guiding front angle and a guiding clearance angle according to a double guiding structure design. The guiding front angle is α4, and α4 is 7° to 12°. The guiding clearance angle includes a first clearance angle and a second clearance angle. The first clearance angle is α5, and α5 is 8° to 12°. The second clearance angle is α6, and α6 is 30° to 45°.

[0041] The design of double guide structure ensures the roughness of the hole wall after the valve plate workpiece is reamed. The design of larger first clearance angle and second clearance angle increases the clearance of the back tool surface, reduces the generation of heat in aluminum alloy processing, inhibits the formation of aluminum alloy flanging and burr damage, and improves the processing quality.

[0042] Based on the above improvements, high-precision hole making in valve plate workpiece processing is achieved, higher hole wall roughness and hole size accuracy can be obtained, and the port damage of the hole is low. While improving the processing quality, the subsequent manual grinding process is reduced, which greatly improves production efficiency.

[0043] like Figures 1 to 6As shown, a first cooling channel 5 is provided at the axis center of the free end of the clamping section 4, and the first cooling channel 5 sequentially penetrates the clamping section 4, the reaming section 3 and the avoidance section 2, and a plurality of first water outlet holes 6 connected to the first cooling channel 5 are provided in the reaming chip removal groove 32, a second cooling channel 7 is provided at the bottom end of the first cooling channel 5, a plurality of second water outlet holes 8 connected to the second cooling channel 7 are provided in the drilling chip removal groove 12, a flow guide component is provided in the first cooling channel 5 and the second cooling channel 7, and a plurality of A liquid inlet hole 9, a water inlet pipe 10 is rotatably sleeved on the clamping section 4, and the water inlet pipe 10 is communicated with multiple liquid inlet holes 9. A grinding ring 13 is slidably sleeved on the outer side of the reaming section 3, and a fixing ring 14 is arranged on the top of the grinding ring 13. The fixing ring 14 is slidably sleeved at a position close to the top of the reaming section 3, and multiple connecting rods 15 are vertically fixedly connected between the fixing ring 14 and the grinding ring 13. A compression spring 16 is fixedly connected to the top of the fixing ring 14, and the compression spring 16 is slidably sleeved on the reaming section 3, and the top of the compression spring 16 is in contact with the bottom end of the clamping section 4;

[0044] By providing the first cooling channel 5 and the second cooling channel 7, before drilling the valve plate, the guide assembly is first installed in the first cooling channel 5, then the grinding ring 13 and the fixing ring 14 are sleeved on the tool, and then the internal cooling forming tool of the present invention is installed on the drilling machine through the clamping section 4, and finally the external cooling water pipeline is connected to the water inlet pipe 10. During the drilling process, when the cooling water flows into the first cooling channel 5 through the water inlet pipe 10 and the liquid inlet hole 9, the guide assembly can guide the cooling water, and when the drilling section 1 performs drilling welding on the valve plate, the cooling water can be sprayed outward only through the second water outlet hole 8 in the drilling chip groove 12 under the guidance of the guide assembly and sprayed on the drilling section 1, so that the cooling water can concentrate on cooling the drilling section 1;

[0045] After the drilling section 1 completes the drilling operation, as the tool moves downward as a whole, when the hole wall contacts the reaming section 3, the spiral reaming blade 31 on the reaming section 3 can perform a fine reaming operation on the hole wall. During this process, the flow guide component can guide the cooling water to spray outward only from the multiple first water outlet holes 6 in the reaming chip groove 32 and spray on the reaming section 3, so that the cooling water can concentrate on cooling the reaming section 3. Since the cooling water is sprayed outward from the inside of the tool, during the process of cooling the tool by the cooling water, heat can be effectively avoided from accumulating inside the tool, thereby improving the heat dissipation effect of the tool. In addition, in different processing stages, the cooling water can be targeted to cool the position of the tool and the workpiece processing, thereby also improving the cooling efficiency and effect of the cooling water on the tool, and avoiding damage to the tool due to high temperature.

[0046] At the same time, during the process of fine reaming of the hole wall by the reaming section 3, when the surface of the workpiece contacts the bottom of the grinding ring 13, the grinding ring 13 can grind the edge of the drilled hole against the top of the workpiece under the action of the pressure of the compression spring 16, thereby making the position of the top edge of the drilled hole smoother and avoiding the generation of burrs.

[0047] like Figures 3 to 6 As shown, the guide assembly includes a hollow guide rod 17, which is inserted into the first cooling channel 5, and the bottom end of the guide rod 17 is inserted into the second cooling channel 7, and the outer diameter of the guide rod 17 matches the inner diameter of the second cooling channel 7, and the top of the guide rod 17 is fixedly connected with a threaded head 18, the sum of the lengths of the guide rod 17 and the threaded head 18 matches the length of the first cooling channel 5, and the threaded head 18 is threadedly connected to the open end of the first cooling channel 5, and a cylindrical block 19 is fixedly sleeved on the guide rod 17, and the diameter of the block 19 matches the inner diameter of the first cooling channel 5, and the side walls of the guide rod 17 are symmetrically penetrated by two first strip-shaped through holes 20 and two second through holes 21 at the top and bottom of the block 19, the height of the first through hole 20 is opposite to the height of the clamping section 4, and the height of the second through hole 21 is opposite to the height of the reaming section 3, The bottom end of the guide rod 17 is designed to be open, and a pull rod 22 is slidably inserted at the bottom end of the guide rod 17, and a sealing column 23 matching the diameter of the second cooling channel 7 is fixedly connected to the bottom end of the pull rod 22, and a fixing rod 24 is fixedly connected to the top end of the pull rod 22, and the two ends of the fixing rod 24 are respectively inserted into the two second through holes 21, and the guide rod 17 is located at the bottom of the block 19. The position of the guide rod 17 is slidably sleeved with a movable sleeve 25, and the two ends of the fixing rod 24 are fixedly connected to the inner wall of the movable sleeve 25 through the two second through holes 21, and the outer diameter of the movable sleeve 25 matches the inner diameter of the first cooling channel 5, and the inner diameter of the movable sleeve 25 matches the outer diameter of the guide rod 17, and locking rods 26 are vertically inserted at the positions near the top end on both sides of the movable sleeve 25, and two strip-shaped limiting holes 27 are symmetrically opened on the side of the clamping section 4, and the two locking rods 26 are respectively threaded through the two limiting holes 27 and inserted on the fixing ring 14;

[0048] In the initial state, the top of the sealing column 23 is located outside the guide rod 17, and the length of the sealing column 23 is the same as the length of the reaming section 3 and the length of the limiting hole 27. The length of the movable sleeve 25 is greater than the length of the second through hole 21, and in the initial state, the bottom of the second through hole 21 is flush with the bottom of the movable sleeve 25.

[0049] When installing the guide assembly, first insert the guide rod 17 together with the movable sleeve 25 into the first cooling channel 5. When the guide rod 17 is fully inserted into the first cooling channel 5, screw the thread head 18 to make it threadedly connected with the first cooling channel 5. At this time, the bottom end of the guide rod 17 is inserted into the second cooling channel 7, the block 19 is tightly attached to the inner wall of the first cooling channel 5, and the movable sleeve 25 is in an active state. Then, the horizontal state of the tool is adjusted so that the movable sleeve 25 can slide along the first cooling channel 5. When the movable sleeve 25 slides to the limit hole 2 7, the compression spring 16, the fixing ring 14 and the grinding ring 13 are sequentially sleeved onto the tool, and the fixing ring 14 is positioned opposite to the top of the movable sleeve 25, and then the two locking rods 26 are sequentially screwed into the fixing and finally plugged into the side of the movable sleeve 25 near the top through the corresponding limiting holes 27. When the two locking rods 26 are tightened, the fixing ring 14 and the movable sleeve 25 are connected together, the top of the compression spring 16 is also kept in close contact with the bottom of the clamping section 4, and the sealing column 23 is just kept separated from the bottom opening of the guide rod 17;

[0050] When the drilling section 1 performs a drilling operation on the valve plate, as the cooling water enters the first cooling channel 5 through the water inlet pipe 10 and the liquid inlet hole 9, due to the obstruction of the block 19, the water in the first cooling channel 5 can only enter the guide rod 17 through the first through hole 20, and because the second through hole 21 is blocked by the movable sleeve 25 at this time, the cooling water can only flow into the second cooling channel 7 through the gap between the bottom end of the guide rod 17 and the sealing column 23. As the second cooling channel 7 is filled with cooling water, the cooling water can be sprayed outward through the second water outlet hole 8 in the drilling chip groove 12 and sprayed on the drilling section 1, so that the cooling water can concentrate on cooling the drilling section 1;

[0051] When the drilling is completed, as the tool moves downward, when the reaming section 3 contacts the drilled hole, the bottom of the grinding ring 13 also contacts the top of the valve plate. At this time, as the tool continues to move downward, the grinding ring 13 can push the fixed ring 14 to move upward through the connecting rod 15 under the top movement of the valve plate and compress the compression spring 16. As the fixed ring 14 moves, the fixed ring 14 can drive the movable sleeve 25 to move upward together through the two locking rods 26. As the movable sleeve 25 moves upward, the movable sleeve 25 can drive the sealing column 23 to move upward through the fixed rod 24 and the pull rod 22. The movable sleeve 25 is moved so that the sealing column 23 can be inserted into the bottom end of the guide rod 17, thereby closing the bottom of the guide rod 17. At the same time, as the movable sleeve 25 moves upward, the second through hole 21 near the bottom end is gradually opened. At this time, the cooling water in the guide rod 17 can flow into the area opposite to the first cooling channel 5 and the reaming section 3 through the second through hole 21. Subsequently, the cooling water entering the area can be sprayed outward from the multiple first water outlet holes 6 in the reaming chip groove 32 and sprayed on the reaming section 3, so that the cooling water can be concentrated on the reaming section 3 to cool down the temperature;

[0052] During the entire process of cooling the tool with cooling water, the cooling water can specifically cool the tool and the workpiece processing location at different processing stages, thereby improving the cooling efficiency and effect of the cooling water on the tool.

[0053] As shown in the figure, a plurality of rubber sealing rings 28 are fixedly sleeved on the surface of the blocking block 19, and the rubber sealing rings 28 are fitted together with the inner wall of the first cooling channel 5;

[0054] By providing the rubber sealing ring 28, when the block 19 is inserted into the first cooling channel 5, the rubber sealing ring 28 can improve the sealing between the block 19 and the first cooling channel 5, thereby preventing the cooling water entering the first cooling channel 5 from seeping through the gap around the block 19 and the limiting hole 27.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A drill-reamer internal cold forming tool for automobile parts processing, characterized in that: It comprises a drilling section (1), a gap avoidance section (2), a reaming section (3) and a clamping section (4) which are connected in sequence, and all four are cylindrical, and the diameters of the drilling section (1), the gap avoidance section (2) and the reaming section (3) are the same, and the diameters of the three are all smaller than the diameter of the clamping section (4); The drilling section (1) comprises a drill tip and a cutting portion, and the drill tip is in a mountain shape. A transverse edge (11) is provided on the drill tip. Two main cutting edges (111) extending toward the outer wall of the cutting portion are provided at both ends of the transverse edge (11). The outer wall of the cutting portion is provided with a secondary cutting edge (112) and a spiral drilling chip removal groove (12); The outer wall of the reaming section (3) is unequally distributed with spiral reaming blades (31) in the circumferential direction, and the two ends of each spiral reaming blade (31) extend to the clearance section (2) and the clamping section (4) respectively, and a spiral reaming chip removal groove (32) is formed between two adjacent spiral reaming blades (31); A first cooling channel (5) is provided at the axis center of the free end of the clamping section (4), the first cooling channel (5) sequentially passes through the clamping section (4), the reaming section (3) and the clearance section (2), a plurality of first water outlet holes (6) connected to the first cooling channel (5) are provided in the reaming chip removal groove (32), a second cooling channel (7) is provided at the bottom end of the first cooling channel (5), a plurality of second water outlet holes (8) connected to the second cooling channel (7) are provided in the drilling chip removal groove (12), a flow guide component is provided in the first cooling channel (5) and the second cooling channel (7), a plurality of liquid inlet holes (9) are provided on the side wall of the clamping section (4), and a plurality of liquid inlet holes (10) are provided on the side wall of the clamping section (4). ), a water inlet pipe (10) is rotatably sleeved on the clamping section (4), the water inlet pipe (10) is communicated with a plurality of liquid inlet holes (9), a grinding ring (13) is slidably sleeved on the outer side of the reaming section (3), a fixing ring (14) is arranged on the top of the grinding ring (13), the fixing ring (14) is slidably sleeved at a position close to the top of the reaming section (3), a plurality of connecting rods (15) are vertically fixedly connected between the fixing ring (14) and the grinding ring (13), a compression spring (16) is fixedly connected to the top of the fixing ring (14), the compression spring (16) is slidably sleeved on the reaming section (3), and the top of the compression spring (16) is in contact with the bottom of the clamping section (4); The guide assembly comprises a hollow guide rod (17), the guide rod (17) being inserted into the first cooling channel (5), the bottom end of the guide rod (17) being inserted into the second cooling channel (7), the outer diameter of the guide rod (17) matching the inner diameter of the second cooling channel (7), the top end of the guide rod (17) being fixedly connected with a threaded head (18), the sum of the lengths of the guide rod (17) and the threaded head (18) matching the length of the first cooling channel (5), and the threaded head (18) and the open end of the first cooling channel (5) being connected. The guide rod (17) is threadedly connected together, and a cylindrical block (19) is fixedly sleeved on the guide rod (17). The diameter of the block (19) matches the inner diameter of the first cooling channel (5). The side wall of the guide rod (17) is symmetrically penetrated by two first strip-shaped through holes (20) and two second through holes (21) at the top and bottom of the block (19). The height of the first through hole (20) is opposite to the height of the clamping section (4), and the height of the second through hole (21) is opposite to the height of the reaming section (3). The bottom end of the rod (17) is designed to be open, and a pull rod (22) is slidably inserted at the bottom end of the guide rod (17), and a sealing column (23) matching the diameter of the second cooling channel (7) is fixedly connected to the bottom end of the pull rod (22), and a fixing rod (24) is fixedly connected to the top end of the pull rod (22), and the two ends of the fixing rod (24) are respectively inserted into the two second through holes (21), and the guide rod (17) is slidably sleeved with a movable sleeve (25) at the bottom of the blocking block (19), and the two ends of the fixing rod (24) are connected through two A second through hole (21) is fixedly connected to the inner wall of the movable sleeve (25), the outer diameter of the movable sleeve (25) matches the inner diameter of the first cooling channel (5), the inner diameter of the movable sleeve (25) matches the outer diameter of the guide rod (17), locking rods (26) are vertically inserted at positions near the top of both sides of the movable sleeve (25), two strip-shaped limiting holes (27) are symmetrically opened on the side of the clamping section (4), and the two locking rods (26) are respectively threadedly inserted through the two limiting holes (27) and inserted into the fixing ring (14).

2. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 1, characterized in that: The main cutting edge (111) adopts a double-vertex structure, and the main cutting edge (111) comprises a first cutting edge (1111) and a second cutting edge (1112), the first cutting edge (1111) is arranged between the transverse cutting edge (11) and the second cutting edge (1112), the angle between the first cutting edge (1111) and the central axis of the drill tip is α1, and α1 is 50-60°, the angle between the second cutting edge (1112) and the central axis of the drill tip is α2, and α2 is 90°; the helix angle of the secondary cutting edge (112) is β, and β is 25-35°.

3. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 2, characterized in that: The reaming section (3) is designed as an unequally divided groove type with 4 to 6 blades, and the unequally divided angles are staggered at 88° to 92°. The groove type is designed to be left-handed and right-handed, and is designed to remove chips forward. The helix angle of the reaming chip removal groove (32) is α3, and α3 is 7° to 15°.

4. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 3, characterized in that: The spiral reaming blade (31) is divided into a guiding front angle and a guiding clearance angle according to a double guiding structure design, the guiding front angle is α4, and α4 is 7° to 12°, the guiding clearance angle includes a first clearance angle and a second clearance angle, the first clearance angle is α5, and α5 is 8° to 12°, and the second clearance angle is α6, and α6 is 30° to 45°.

5. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 4, characterized in that: In the initial state, the top end of the sealing column (23) is located outside the guide rod (17), and the length of the sealing column (23) is the same as the length of the reaming section (3) and the length of the limiting hole (27).

6. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 5, characterized in that: A plurality of rubber sealing rings (28) are fixedly sleeved on the surface of the blocking block (19), and the rubber sealing rings (28) are fitted together with the inner wall of the first cooling channel (5).

7. The drill-reamer integrated cold forming tool for automobile parts processing according to claim 6, characterized in that: The length of the movable sleeve (25) is greater than the length of the second through hole (21), and in an initial state, the bottom of the second through hole (21) is flush with the bottom of the movable sleeve (25).

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