Multi-edge PCD thread milling cutter for machining superhard materials

Abstract

The utility model relates to the technical field of cutters, and discloses a multi-blade PCD thread milling cutter for processing superhard materials, which is used for processing threads of aluminum-based silicon carbide composite materials and comprises a milling cutter rod and a milling cutter head, the milling cutter head is made of high-hardness materials and fixedly connected to the front end of the milling cutter rod through welding, the milling cutter head comprises blades, and the blades are fixedly connected to the front end of the milling cutter rod through welding. The number of the cutting edges is 18, the cutting edges are distributed along the outer surface of the circumference of the cutter head in an array mode and fixedly connected with the cutter head in a welded mode, and when the milling cutter head is used for cutting, all the cutting edges conduct cutting operation at the same time; the equipment has the advantages of multiple blades, stable connection among the blades and capability of automatically adding cooling liquid to cutting points, and solves the problems that a cutter is easy to wear and break when a superhard material is machined in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool technical field, concretely is a kind of multi-edge PCD thread milling cutter for superhard material processing. BACKGROUND

[0002] Aluminum-based silicon carbide composite material is difficult to process, mainly in that its hardness is very high;Silicon carbide, also known as emery, is a very hard material, with a hardness second only to diamond, and aluminum-based silicon carbide, as a composite material of metallic aluminum and particulate reinforced silicon carbide, its hardness increases with the increase of silicon carbide content, when cutting, it can seriously wear the tool, and increase the cost of mechanical processing. Especially for some small size thread (M4 below) hole processing, the difficulty is greater, the main reason is that the smaller the thread hole, the limited tool design size, resulting in insufficient tool strength, increased tool manufacturing difficulty affecting tool precision, poor chip removal and other problems.

[0003] Traditional processing technology usually uses one PCD thread milling cutter to directly interpolate thread milling or uses two PCD thread milling cutters for rough and fine machining. Regardless of which method is used, the thread tool is severely worn, the machining efficiency is low, and the thread accuracy is difficult to guarantee. SUMMARY

[0004] (I) The technical problem solved: in view of the deficiencies of the prior art, the utility model provides a multi-edge PCD thread milling cutter for superhard material processing, which has the advantages of multiple edges, stable connection between edges, and can independently add cooling liquid to the cutting point. The problem of tool wear and breakage when machining superhard materials in the prior art is solved.

[0005] (II) Technical solution: to achieve the above-mentioned purpose of having multiple edges and being able to independently add cooling liquid to the cutting point, the utility model provides the following technical solution: a multi-edge PCD thread milling cutter for superhard material processing, comprising a milling cutter bar and a milling cutter head, the milling cutter head is fixedly connected with the front end of the milling cutter bar, the milling cutter head comprises a blade, the number of blades is greater than 10, which are arrayed along the circumferential outer surface of the milling cutter head and fixedly connected with the milling cutter head, and the blades are located at the same horizontal height;The blade includes a rake face and a flank face, an avoidance space is provided between adjacent blades, a connecting block is fixedly connected in the avoidance space, the number of connecting blocks is two, which are placed in vertical direction, there is a gap between the two connecting blocks, forming a liquid tank, and the two sides of the connecting block are fixedly connected with the rake face and the flank face of adjacent blades.

[0006] As preferred, the liquid groove extends to the interior of the milling cutter head, and converges at the center; the milling cutter rod and the milling cutter head are coaxial designs, and both have a liquid delivery channel at the center; the liquid delivery channel penetrates the milling cutter rod and communicates to the milling cutter head, and is in communication with the liquid groove in the interior of the milling cutter head.

[0007] As preferred, the liquid groove and the tip of the blade are in the same horizontal plane; the two connecting blocks distributed above and below are obliquely installed, and both converge to the gap; the opening of the liquid groove is smaller than the size of the connecting end of the liquid groove and the milling cutter head.

[0008] As preferred, the milling cutter head and the blade are made of PCD material; and the milling cutter rod is made of hard alloy material.

[0009] As preferred, the blade is provided with a tip R angle at the tip.

[0010] (Three) beneficial effects: compared with the prior art, the utility model provides a multi-blade PCD thread milling cutter for superhard material processing, which has the following beneficial effects:

[0011] 1. The multi-blade PCD thread milling cutter for superhard material processing is designed with not less than 10 blades which are arrayed along the circumference of the milling cutter head, and the milling cutter head and the milling cutter rod are connected together by a special welding process to form a complete thread milling cutter; during processing, the cutter is inserted according to the processing sequence from top to bottom, and all the blades participate in cutting at the same time, each blade bears a small amount of cutting load, which greatly reduces the tool wear and guarantees the thread size precision while improving the processing efficiency. During thread milling processing, the parameters include speed S and feed F, wherein the feed F is a parameter for measuring the speed of processing efficiency, and the feed F = cutting amount per blade * total number of blades * speed, the cutting amount and the speed are determined by the tool material, and the changeable range is small; therefore, increasing the total number of blades can improve the feed F, thereby improving the processing efficiency. The commonly used traditional thread milling cutter has 1 blade, 2 blades and 4 blades, and the blades are easy to wear during processing of aluminum-based silicon carbide composite material threads, which leads to low processing efficiency and difficulty in guaranteeing the thread size precision. The 18-blade thread milling cutter can solve the above problems, that is, improve the thread processing quality and processing efficiency, and reduce the production and processing cost; and the connecting blocks are arranged between the clearance positions of the milling cutter, and the connecting blocks are fixedly connected to the rake faces and the flank faces of two adjacent blades, so that the two adjacent blades are more stable, and the situation that the blades break and fly out during processing of hard materials is avoided, thereby ensuring the safety during processing.

[0012] 2. The multi-blade PCD thread milling cutter for superhard material processing, by setting the connecting block on the avoidance position between the rake face and the relief face of the adjacent blade, the gap formed by the connecting block forms the liquid groove, and the liquid groove is connected to the liquid delivery channel penetrating the milling cutter rod, so when the milling cutter needs to be used for processing, the user first pours the cooling liquid into the interior of the milling cutter rod through the liquid delivery channel, at this time, due to the relatively small opening design of the liquid groove and the influence of the self-tension of the cooling liquid, the cooling liquid will not flow out of the liquid groove in the static state, thereby avoiding unnecessary waste and leakage, and when the milling cutter is cutting, the cooling liquid in the liquid groove will be thrown outward under the action of centrifugal force, in this process, the cooling liquid enters the cutting point with higher hydraulic pressure, thereby significantly improving the cooling effect. Compared with the traditional method of adding cooling liquid externally through additional spraying equipment, this design not only avoids the problem of uneven distribution of cooling liquid, but also greatly reduces the workload of the operator, improves the processing efficiency and safety. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a complete structure schematic view of the utility model;

[0014] Figure 2 is a top view structure schematic view of the utility model;

[0015] Figure 3 is a milling cutter rod part partial section structure schematic view of the utility model;

[0016] Figure 4 is a complete structure section structure schematic view of the utility model.

[0017] In the figure: 1, milling cutter rod; 11, liquid delivery channel; 2, milling cutter head; 21, blade; 211, rake face; 212, relief face; 213, blade tip R angle; 22, avoidance position; 3, connecting block; 31, liquid groove. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] Please refer to Figures 1-2A multi-blade PCD thread milling cutter for superhard material processing, comprising a milling cutter bar 1 and a milling cutter head 2, the milling cutter head 2 is fixedly connected with the front end of the milling cutter bar 1, the milling cutter head 2 comprises blades 21, the number of blades 21 is greater than 10, in this embodiment, it is specifically designed as 18, the blades 21 are arrayed along the circumferential outer surface of the milling cutter head 2 and are fixedly connected with the milling cutter head 2, the blades 21 are located at the same horizontal height, ensuring that each blade 21 can simultaneously contact the machined surface during cutting; the blade 21 comprises a rake face 211 and a relief face 212, an avoidance position 22 is arranged between adjacent blades 21, the avoidance position 22 is fixedly connected with a connecting block 3, the number of connecting blocks 3 is two, the two connecting blocks 3 are placed in the vertical direction, a gap is left between the two connecting blocks 3, forming a liquid groove 31, the two sides of the connecting block 3 are fixedly connected with the rake face 211 and the relief face 212 of the adjacent blade 21, in this embodiment, the fixed connection is formed by welding. During processing, the tool is inserted according to the spiral interpolation processing sequence from top to bottom, 18 blades 21 participate in cutting at the same time, each blade bears a small amount of cutting amount, greatly reduces the tool wear amount, ensures the thread size precision and improves the processing efficiency. During thread milling processing, the parameters include speed S and feed F, wherein the feed F is a parameter for measuring the speed of processing efficiency, the feed F = cutting amount per blade * total number of blades * speed, the cutting amount and the speed are determined by the tool material, and the changeable range is small; therefore, increasing the total number of blades can improve the feed F, thereby improving the processing efficiency. The commonly used traditional thread milling cutter has 1 blade, 2 blades and 4 blades, and the number of blades is small, which is easy to wear during processing of aluminum-based silicon carbide composite material threads, resulting in low processing efficiency and difficult to ensure the thread size precision. The 18-blade thread milling cutter of the present technology can well solve the above problems, that is, improve the thread processing quality and processing efficiency, and reduce the production and processing cost; and the connecting block 3 is arranged between the avoidance positions 22 of the milling cutter, the connecting block 3 is fixedly connected with the rake face 211 and the relief face 212 of the two adjacent blades 21, so that the two adjacent blades 21 are more stable, avoiding the situation that the blades 21 break and fly out during processing of hard materials, ensuring the safety during processing.

[0020] Please refer to Figures 3-4, the front rake face 211 and the rear rake face 212 of adjacent blades 21 are provided with a clearance 22, the clearance 22 helps to avoid unnecessary cutting of the milling cutter, which can reduce tool wear, prolong the service life of the tool, and reduce production costs; the blade 21 is provided with a nose R angle 213 at the nose, the nose of the tool has a small force surface during machining, especially when machining hard materials or materials with impurities, the nose is easily worn or broken, the design of the nose R angle 213 can protect the nose and effectively prevent such situations from occurring, thereby improving tool life; the milling cutter head 2 is provided with a connecting block 3 at the corresponding position of the clearance 22, the clearance formed by the connecting block 3 forms a liquid groove 31, the liquid groove 31 and the nose of the blade 21 are located at the same horizontal plane, and in order to increase the water pressure of the cooling liquid coming out of the liquid groove 31 during rotation, the two connecting blocks 3 distributed above and below are installed at an angle, and the liquid groove 31 is smaller than the size of the internal passage of the liquid groove 31, and the liquid groove 31 extends inwardly and converges at the center of the milling cutter head 2; the milling cutter rod 1 and the milling cutter head 2 are coaxial, and the inner center is provided with a liquid delivery channel 11, the liquid delivery channel 11 penetrates the milling cutter rod 1 and is connected to the milling cutter head 2, and the liquid delivery channel 11 is in communication with the liquid groove 31 in the milling cutter head 2; the liquid groove 31 is located below the blade 21, and the opening size of the liquid groove 31 is smaller than the size of the blade 21, when the milling cutter is used for machining, the user first pours cooling liquid into the milling cutter rod 1 through the liquid delivery channel 11, at this time, due to the relatively small opening design of the liquid groove 31 and the influence of the cooling liquid itself, the cooling liquid will not flow out of the liquid groove 31 in a static state, thereby avoiding unnecessary waste and leakage, and when the milling cutter is cutting, the cooling liquid in the liquid groove 31 will be affected by the centrifugal force and be thrown outward, in this process, the cooling liquid enters the cutting point with higher liquid pressure, thereby significantly improving the cooling effect. Compared with the traditional method of adding cooling liquid externally through additional spraying equipment, this design not only avoids the problem of uneven distribution of cooling liquid, but also greatly reduces the workload of the operator, improves the machining efficiency and safety.

[0021] In summary, the multi-blade PCD thread milling cutter for machining superhard materials is inserted into the cutter according to the machining sequence from top to bottom, 18 blades 21 participate in cutting at the same time, each blade bears a small amount of cutting load, which greatly reduces the tool wear, and the connecting block 3 is added between the blades 21, so that the adjacent blades 21 are connected to each other, so that the force borne by each blade 21 is shared by the adjacent blades 21, which makes the structure more stable and ensures the thread size accuracy and improves the machining efficiency; and the centrifugal force can be used to add cooling water to the cutting point at the same time of cutting, which is more uniform than the manual addition of the prior art, and also improves the machining efficiency.

[0022] It has to be noted that, as used herein, such as in the claims, the term "comprising" is used in the sense of "including", and the term "comprise", "comprises" and "comprised of" are to be interpreted in accordance with the above definition. Similarly, it is to be understood that the description of features, such as in the claims, is for the purpose of illustrating the present application and is not intended to limit the present application in any way.

[0023] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A multi-tooth PCD thread milling cutter for machining super-hard materials comprising a cutter bar (1) and a cutter head (2) characterised in that: The milling cutter head (2) is fixedly connected with the front end of the milling cutter rod (1), the milling cutter head (2) includes cutting edges (21), the number of the cutting edges (21) is greater than 10, the cutting edges (21) are arrayed on the circumferential outer surface of the milling cutter head (2) and are fixedly connected with the milling cutter head (2), and the cutting edges (21) are located at the same horizontal height; the cutting edge (21) includes a rake face (211) and a relief face (212), an avoidance position (22) is arranged between adjacent cutting edges (21), the avoidance position (22) is fixedly connected with a connecting block (3), the number of the connecting block (3) is two, the connecting block (3) is placed in the vertical direction, a gap is left between the two connecting blocks (3) to form a liquid tank (31), and the two sides of the connecting block (3) are fixedly connected with the rake face (211) and the relief face (212) of adjacent cutting edges (21) respectively.

2. A multi-tooth PCD thread milling cutter for machining super-hard materials according to claim 1 wherein: The liquid tank (31) extends to the inside of the milling cutter head (2) and is collected at the center of the circle; the milling cutter rod (1) and the milling cutter head (2) are coaxially designed, and a liquid delivery channel (11) is arranged at the center of the circle inside the milling cutter rod (1) and the milling cutter head (2); the liquid delivery channel (11) penetrates through the milling cutter rod (1) and is communicated to the milling cutter head (2) and is communicated with the liquid tank (31) inside the milling cutter head (2).

3. A multi-tooth PCD thread milling cutter for machining super-hard materials according to claim 2, wherein: The liquid tank (31) and the cutting edge (21) are located on the same horizontal plane; the two connecting blocks (3) are obliquely installed between the upper and lower connecting blocks (3) and are close to the gap, and the size of the opening of the liquid tank (31) is smaller than the size of the connecting end of the liquid tank (31) and the milling cutter head (2).

4. A multi-tooth PCD thread milling cutter for machining super-hard materials according to claim 1, characterised in that: The milling cutter head (2) and the cutting edge (21) are made of PCD material; and the milling cutter rod (1) is made of hard alloy material.

5. A multi-tooth PCD thread milling cutter for machining super-hard materials according to claim 1, characterised in that: The cutting edge (21) is provided with a cutting edge R angle (213) at the cutting edge.

Images