A replaceable staggered tooth composite drill

Abstract

The present application relates to a replaceable staggered-tooth composite drill, comprising a chamfering blade 1, a chamfering blade 2, a replaceable drill bit, a tool rod and a locking screw, wherein the tool rod comprises a tool groove and a chip groove, the replaceable tool head is connected to the tool rod by an elastic connection, and the chamfering blade 1 and the chamfering blade 2 are mounted on the tool groove by a locking screw. In the replaceable staggered-tooth composite drill of the present invention, the angles between the chamfering blade 1 and the chamfering blade 2 and the central axis are A1=A2, respectively, to ensure that the chamfering angles are consistent. When A1=A2, and r1=r2=0.5*d, L1≠L2, indicating that the chamfering blade 1 and the chamfering blade 2 are staggered-tooth structures, which ensures that the drilling depth is consistent before and after grinding, and the drilling and chamfering process can be completed in one processing, and the tool head can be ground, saving processing costs and improving processing efficiency.

Description

Technical Field

[0001] The invention relates to the field of metal cutting and processing, and in particular to a replaceable staggered-tooth composite drill. Background Art

[0002] Drilling and chamfering compound tools can complete drilling and chamfering of hole mouths at one time, which is very common in mechanical processing. At the same time, cemented carbide resources are very precious. In order to save scarce resources, people often use replaceable drill bits with chamfering.

[0003] Authorization announcement number CN209206543U discloses a new type of drill / boring / chamfering integrated replaceable blade tool, including a drilling blade, a fine boring blade and a chamfering blade, which can complete the drilling, fine boring and hole chamfering processes in one processing. However, since the drilling is completed with a drilling blade, it cannot be repaired after wear and can only be used by replacing the cutting edge, which is costly.

[0004] CN206366678U discloses a replaceable head integrally formed drill bit. If the replaceable head drill tip is reground after wear, the length of the replaceable head drill tip becomes shorter after grinding. The large PCD cutter and the small PCD blade are connected to the cutter body by welding, and the position is fixed. Therefore, the relative position of the large PCD cutter and the small PCD blade and the replaceable head drill tip cannot be guaranteed, resulting in the size of the processed hole being out of tolerance or even waste. Therefore, this type of tool cannot be reground, and the production cost is high. At the same time, because the large PCD cutter and the small PCD blade are connected to the cutter body by welding, after they are worn out, the cutter body is also scrapped, which is costly.

[0005] CN111604524A discloses a multi-section interchangeable head combination drill, including a drill insert for drilling and a chamfering insert for chamfering. The drill insert and the chamfering insert can be replaced after being worn, and the drill rod and the base can be used repeatedly, thereby reducing production costs. When the drill insert is worn, it can be repaired and then the relative position of the drill insert and the chamfering insert can be ensured by adjusting the drilling depth. However, this type of tool has a complex structure and requires an additional drilling depth adjustment mechanism. In addition, since the length change after each drill insert is repaired and ground is uncertain, the drilling depth needs to be adjusted multiple times to meet the processing requirements, and the adjustment efficiency is low and it is inconvenient to use.

[0006] Therefore, it is urgent to solve the problems existing in the above-mentioned background technology. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a replaceable staggered-tooth composite drill which has a simple structure, is convenient to operate and can be repaired.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A replaceable staggered-tooth compound drill comprises a first chamfering blade, a second chamfering blade, a replaceable cutter head, a tool rod and a locking screw, wherein the central axis of the tool rod is the central axis, the tool rod comprises a tool groove and a chip groove, the angles between the first chamfering blade and the second chamfering blade and the central axis are A1 and A2 respectively, the diameter of the replaceable cutter head is d, a point P1 and P2 are taken on the cutting edge of the first chamfering blade and the second chamfering blade respectively, the distances between P1 and P2 and the central axis are r1 and r2 respectively, the distances between P1 and P2 and the replaceable cutter head are L1 and L2 respectively, and A1 and A2, r1 and r2, and L1 and L2 simultaneously satisfy the following relationships: A1=A2, r1=r2=0.5*d, L1≠L2.

[0010] The first chamfering blade and the second chamfering blade are not installed in the blade groove at the same time.

[0011] The knife groove comprises a knife groove bottom positioning surface, a knife groove side positioning surface 1, a knife groove side positioning surface 2, a knife tip clearance surface and a locking screw hole.

[0012] The replaceable cutter head is connected to the cutter rod by an elastic connection.

[0013] The chamfering blade one and the chamfering blade two are installed on the blade groove through the locking screw hole by means of locking screws.

[0014] Compared with the prior art, the replaceable staggered-tooth composite drill proposed by the present invention has the following beneficial effects:

[0015] In the replaceable staggered-tooth composite drill of the present invention, the angles between the chamfering blade 1 and the chamfering blade 2 and the central axis satisfy the relationship A1=A2, ensuring that the chamfering angles are consistent. When A1=A2, and r1=r2=0.5*d, L1≠L2, indicating that the chamfering blade 1 and the chamfering blade 2 are staggered-tooth structures, and there is an axial hysteresis. Therefore, through the staggered-tooth structure, the drilling depth before and after grinding is guaranteed to be consistent, achieving the technical effect of the replaceable staggered-tooth composite drill having a simple structure, convenient operation, and the ability to grind. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the replaceable staggered-tooth composite drill of the present invention.

[0017] Figure 2 The present invention is a schematic diagram of the relative positions of the replaceable staggered-tooth composite drill chamfering blade 1, chamfering blade 2 and the replaceable cutter head.

[0018] Figure 3 yes Figure 2 A partial enlarged view of point D.

[0019] Figure 4 It is a structural schematic diagram of the replaceable staggered-tooth composite drill groove and the chip removal groove of the present invention.

[0020] Figure 5 yes Figure 4 A partial enlarged view of point C.

[0021] Figure 6 The diagram is a comparison of the replaceable cutter head of the replaceable staggered-tooth composite drill of the present invention before and after grinding.

[0022] Figure 7 It is a comparison diagram of the replaceable cutter head of the replaceable staggered-tooth composite drill of the present invention before and after assembly.

[0023] The symbols in the figure represent:

[0024] 1. Chamfering blade one; 2. Chamfering blade two; 3. Interchangeable cutter head; 4. Cutter bar; 5. Locking drill tip; 6. Center axis; 41. Cutter groove; 42. Chip groove; 411. Cutter groove bottom positioning surface; 412. Cutter groove side positioning surface one; 413. Cutter groove side positioning surface two; 414. Cutter tip clearance surface; 415. Locking screw hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] The present invention provides a replaceable staggered tooth composite drill. Figure 1-7 Make the following description:

[0027] Figure 1 An embodiment of a replaceable staggered-tooth composite drill of the present invention is shown, comprising a chamfering blade 1, a chamfering blade 2, a replaceable cutter head 3, a tool rod 4 and a locking screw 5, wherein the central axis of the tool rod 4 is a central axis 6.

[0028] Figure 2 and Figure 3The relative position relationship of chamfering blade 1, chamfering blade 2 and replaceable cutter head 3 is shown. The angles between chamfering blade 1 and chamfering blade 2 and the central axis 6 are A1 and A2, A1=A2, the diameter of replaceable cutter head 3 is d, and there are points P1 and P2 on the cutting edges of chamfering blade 1 and chamfering blade 2, respectively. The distances between P1 and P2 from the central axis 6 are r1 and r2, r1=r2=0.5*d, and the distances between P1 and P2 from the replaceable cutter head 3 are L1 and L2, and L1<L2 in this figure. If L1<L2, record the lag △L, △L=L2-L1. When a new cutter head is used, only chamfering blade 1 is installed. At this time, the axial relative position of chamfering blade 1 and replaceable cutter head is L1, that is, the depth of the drilled hole is L1. With the use of the tool, the replaceable cutter head will inevitably wear and need to be sharpened. The length difference before and after the replaceable cutter head is recorded as △h. During the grinding, △h=△L=L2-L1 is ensured. After the replaceable cutter head is ground, it is installed on the cutter bar. Then the chamfering blade 1 is removed and only the chamfering blade 2 is installed. At this time, the axial position of the chamfering blade 2 and the replaceable cutter body after grinding is still L1. Therefore, the staggered tooth structure ensures that the drilling depth before and after grinding is consistent. Similarly, when L2<L1, the staggered tooth structure can also solve the problems existing in the background technology.

[0029] Figure 4 and Figure 5 The knife groove 41 is shown to include a knife groove bottom positioning surface 411, a knife groove side positioning surface 1 412, a knife groove side positioning surface 2 413, a knife tip clearance surface 414 and a locking screw hole 415. During use, the chamfering blade 1 and the chamfering blade 2 are not installed on the knife groove 41 at the same time. The chamfering blade 1 and the chamfering blade 2 are installed on the knife groove 41 through the locking screw 5 through the locking screw hole 415.

[0030] Figure 6 A comparison diagram of the replaceable cutter head 3 before and after grinding is shown.

[0031] Figure 7 The scenes of only installing chamfering blade 1 on the replaceable cutter head 3 before grinding and only installing chamfering blade 2 on the replaceable cutter head 3 after grinding are shown and compared.

[0032] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A replaceable staggered-tooth compound drill, comprising a chamfering blade 1 (1), a chamfering blade 2 (2), a replaceable cutter head (3), a tool rod (4), a locking screw (5) and a central axis (6), wherein the tool rod (4) comprises a tool groove (41) and a chip groove (42), the angles between the chamfering blade 1 (1) and the chamfering blade 2 (2) and the central axis (6) are A1 and A2 respectively, the diameter of the replaceable cutter head (3) is d, a point P1 and a point P2 are taken on the cutting edge of the chamfering blade 1 (1) and the chamfering blade 2 (2) respectively, the distances between the points P1 and P2 and the central axis (6) are r1 and r2 respectively, the distances between the points P1 and P2 and the tip of the replaceable cutter head (3) are L1 and L2 respectively, and the characteristics are as follows: A1 and A2, r1 and r2, and L1 and L2 simultaneously satisfy the following relationship: A1=A2, r1=r2=0.5*d, L1≠L2; The chamfering blade one (1) and the chamfering blade two (2) are not installed on the tool groove (41) at the same time; if L1 < L2, the lag amount △L is recorded, △L = L2-L1, and when a new tool head is used, only the chamfering blade one (1) is installed; the length difference before and after the replaceable tool head (3) is △h, and during the grinding, △h = △L = L2-L1 is ensured, and when the replaceable tool head (3) is installed on the tool rod after grinding, the chamfering blade one (1) is removed and only the chamfering blade two (2) is installed.

2. The replaceable staggered-tooth composite drill according to claim 1, characterized in that: The knife groove 41 comprises a knife groove bottom positioning surface (411), a knife groove side positioning surface 1 (412), a knife groove side positioning surface 2 (413), a knife tip clearance surface (414) and a locking screw hole (415).

3. The replaceable staggered-tooth composite drill according to claim 1, characterized in that: The replaceable cutter head (3) is connected to the cutter rod (4) by means of an elastic connection.

4. The replaceable staggered-tooth composite drill according to claim 1, characterized in that: The chamfering blade one (1) and the chamfering blade two (2) are mounted on the blade groove (41) via locking screws (5) through locking screw holes (415).

5. The replaceable staggered-tooth composite drill according to claim 1, characterized in that: The chamfering blade one (1), the chamfering blade two (2) and the replaceable cutter head (3) are all made of hard alloy.

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