High-efficiency forming milling cutter for machining powder discharging groove of rock drilling bit

Abstract

The utility model discloses a high-efficiency forming milling cutter for processing a powder discharging groove of a rock drilling bit, which belongs to the field of metal non-standard groove profile processing, and comprises a cutter head and blades which are designed in a split mode, the blades are installed on installation positions on the periphery of the cutter head through screws, and the shapes of the blades are designed according to the shape of the powder discharging groove. The blade is symmetrically provided with two groups of cutting edges and is a coating hard alloy blade. The forming milling cutter has the characteristics of high processing efficiency, long service life and no need of repeated grinding, and the cutter head does not need to be replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of non-standard metal groove processing, in particular to a high-efficiency forming milling cutter for processing a powder discharge groove of a rock drilling bit. Background Art

[0002] At present, horizontal milling machines are mostly used for processing the powder groove of rock drill bits. Figure 5 The groove design (shown in the figure) includes various non-standard shapes, such as arcs and right angles. Conventional cutting tools are unable to process these grooves. Since there are no off-the-shelf cutting tools available, manufacturers need to design their own cutting tools for processing. Currently, the powder grooves in rock drill bits are usually processed using welded milling cutters. This involves machining blades that match the groove shape and then welding them to the cutterhead. Welded milling cutters suffer from low processing efficiency, rapid tool wear, and short tool life. When worn, they require highly skilled workers to sharpen the cutter, which is time-consuming and expensive. Replacement requires the entire cutterhead, further increasing processing costs. Utility Model Content

[0003] In response to the defects of the existing technology, the utility model provides a high-efficiency formed milling cutter for processing the powder groove of the rock drilling bit. It has high processing efficiency and long service life, does not require repeated grinding, and the cutter disc does not need to be replaced, which can save costs and resources.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is:

[0005] A high-efficiency formed milling cutter for processing powder discharge grooves in rock drilling bits, comprising a cutter disc and a blade, wherein the cutter disc is mounted on a horizontal milling cutter rod, and the cutter disc and the blade are of a split design. A plurality of blade mounting positions are evenly arranged around the cutter disc, and a blade is mounted on each blade mounting position by a screw. Each of the blades is provided with two symmetrically arranged groups of cutting edges, each group of cutting edges comprising two blade faces arranged at a certain angle and a blade tip located at the intersection of the two blade faces. The four blade faces of the two groups of cutting edges are respectively arranged on the four sides of the blade, the two blade tips are arranged opposite to each other, and the blade tips are designed with rounded corners that match the shape of the powder discharge groove.

[0006] As a further preferred solution, the arc radius of the rounded corner is R1-R8.

[0007] As a further preferred solution, the arc radius of the rounded corner of the tool tip is R3-R5.

[0008] As a further preferred solution, the angle between the two cutting edges of each set of cutting edges is 60°-120°.

[0009] As a further preferred solution, the angle between the two cutting edges of each set of cutting edges is 60°-90°.

[0010] As a further preferred solution, the blade mounting position is provided with a blade mounting groove and a threaded through hole, the center of the blade is provided with a stepped hole, and the blade is placed in the mounting groove and fixed by a countersunk screw.

[0011] As a further preferred solution, the blade mounting groove is a V-shaped groove, and the angle between the two groove edges of the V-shaped groove is the same as the angle between the two edge surfaces of the blade cutting edge, so as to facilitate positioning of the blade.

[0012] As a further preferred solution, an arc avoidance groove is provided at the top corner of the V-shaped groove to prevent the tip of the tool from interfering with the mounting groove.

[0013] As a further preferred solution, the blade is a coated cemented carbide blade.

[0014] As a further preferred solution, 5-6 blade mounting positions are provided around the cutter disc.

[0015] Beneficial effects:

[0016] 1. The high-efficiency forming milling cutter of the utility model has a split design of the blade and the cutter disc. The blade can be detachably installed on the cutter disc. When replacing, you only need to remove the blade and replace it without replacing the cutter disc. Compared with the existing welded tools, it can greatly save costs and resources.

[0017] 2. Each blade of the utility model is designed with two symmetrical sets of cutting edges. After one side is used, the blade can be removed and the installation direction can be changed to use the other side for cutting. There is no need for repeated grinding, which saves labor costs and time costs and improves processing efficiency.

[0018] 3. The shape of the blade of the utility model is adapted to the shape of the powder discharge groove of the rock drilling bit, and the powder discharge groove can be formed in one go, which greatly improves the processing efficiency and forming accuracy.

[0019] 4. The blade of the utility model is plated with a hard alloy coating, and the blade has a long service life.

[0020] 5. The cutter disc is provided with a V-shaped mounting groove, which can effectively position the blade and effectively protect the spare cutting edge of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the high-efficiency forming milling cutter of the utility model (the screws in the figure are not tightened in place);

[0022] Figure 2 A schematic diagram of the three-dimensional structure of the blade of the utility model;

[0023] Figure 3A schematic plan view of the blade of the utility model;

[0024] Figure 4 A schematic structural diagram of the blade mounting slot of the utility model.

[0025] Figure 5 Schematic diagram of the existing rock drilling bit powder discharge groove structure.

[0026] Figure numerals: 1. cutter disc, 2. blade, 3. screw, 4. blade surface, 5. blade tip, 6. V-shaped groove, 7. arc avoidance groove, 8. powder discharge groove. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, a high-efficiency formed milling cutter for processing powder grooves in rock drilling bits includes a split-design cutter disc 1 and a blade 2. Multiple blade 2 mounting positions are evenly distributed around the cutter disc 1. A blade 2 is detachably mounted at each blade 2 mounting position by a screw 3. The cutter disc 1 is fixed on a tool rod and installed on a horizontal milling machine for milling processing. The cutter disc 1 and the blade 2 are designed to be split. When the blade 2 is worn, it is only necessary to remove the blade 2 for replacement without replacing the entire cutter disc 1.

[0029] Furthermore, the present invention designs the blade 2 symmetrically, such as Figure 2-3 As shown, each blade 2 is provided with two sets of cutting edges arranged symmetrically, so that one blade 2 can be used twice. After one set of cutting edges is used, the screw 3 can be removed and the installation direction can be changed to continue using the other set of cutting edges, which can increase the service life of the tool and improve processing efficiency.

[0030] The blade 2 is specifically designed to match the shape of the powder discharge groove 8, allowing for a one-time molding process of the powder discharge groove 8, thereby improving the processing efficiency and molding accuracy of the powder discharge groove 8. Each set of cutting edges includes two blade faces 4 arranged at a certain angle and a blade tip 5 located at the intersection of the two blade faces 4. The angle between the two blade faces 4 is set according to the shape of the powder discharge groove 8. The four blade faces 4 of the two sets of cutting edges are arranged on the four sides of the blade 2, and the two blade tips 5 are arranged opposite each other. The blade tips 5 are designed with a radius R that matches the shape of the powder discharge groove 8. This radius R design can also reduce stress concentration. The angle between the two blade faces 4 on either side of the blade tip 5 is also set according to the processing requirements of the powder discharge groove 8.

[0031] In a preferred embodiment, the arc radius of the fillet R is R1-R8, and the angle b between the two cutting edges 4 of each group of cutting edges is 60°-120°.

[0032] In another preferred embodiment, the arc radius of the fillet R of the cutting edge 5 is R3-R5, and the angle b between the two cutting edges 4 of each group of cutting edges is 60°-90°.

[0033] In order to further improve the service life of the tool, a cemented carbide coating is provided on the outside of the blade 2 to improve its hardness and wear resistance, thereby increasing the service life of the blade 2.

[0034] The blade 2 of the present invention is mounted on the blade mounting position on the cutter head 1 by means of screws 3. Specifically, a blade mounting slot is provided at the blade mounting position, such as Figure 4 As shown, the blade mounting groove is a V-shaped groove 6 that matches the shape of the blade 2. The angle between the two groove edges of the V-shaped groove 6 is the same as the angle between the two edge surfaces 4 of the cutting edge of the blade 2. At the same time, a circular arc avoidance groove 7 is provided at the top corner of the V-shaped groove 6 to prevent the blade tip 5 from interfering with the mounting groove, making it easier to position the blade 2 through the two groove edges of the V-shaped groove 6. The shape of the blade mounting groove designed in this utility model matches the shape of the blade 2, which can not only achieve precise positioning of the blade 2 during installation, but also effectively protect the spare cutting edge.

[0035] Furthermore, a stepped hole is provided in the center of the blade 2, and a threaded through hole is provided at the bottom of the blade mounting groove. After the blade 2 is placed in the mounting groove and positioned by the V-shaped groove 6, the countersunk screw 3 passes through the stepped hole and is screwed into the threaded through hole to fix the blade 2. After the screw 3 is tightened into place, the head of the screw 3 is sunk in the stepped hole.

[0036] According to processing requirements, 5-6 blade installation positions are set around the cutter head 1 of the present invention.

[0037] exist Figure 1 In the embodiment shown, five blade mounting positions are provided around the periphery of the cutter disc 1 .

[0038] When using the high-efficiency forming milling cutter of the present invention to process the powder discharge groove, the blade is first fixed to the mounting groove around the cutter head with screws. The cutter head is then mounted on the cutter bar, and the rock drill bit can then be milled. Since the blade shape matches the powder discharge groove shape, the powder discharge groove can be formed in one go, greatly improving processing efficiency. At the same time, since each blade is provided with two sets of cutting edges, if one side of the blade is worn, it can be removed and replaced with the other side for continued use. When both sides of the blade are worn, no re-grinding is required, and a new blade can be replaced, and the cutter head can continue to be used. This new high-efficiency forming milling cutter has a long tool life, does not require re-grinding, and the blade can be quickly replaced, which can reduce the manpower and time costs required for re-grinding and improve processing efficiency.

[0039] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-efficiency forming milling cutter for processing a dust removal groove of a rock drill bit, comprising a cutter disc and a blade, wherein the cutter disc is mounted on a horizontal milling cutter bar, and is characterized in that: The cutter disc and blade are of split design, and multiple blade mounting positions are evenly arranged around the cutter disc. A blade is installed on each blade mounting position by a screw. Each blade is provided with two symmetrically arranged groups of cutting edges, and each group of cutting edges includes two blade surfaces arranged at a certain angle and a blade tip located at the intersection of the two blade surfaces. The four blade surfaces of the two groups of cutting edges are respectively arranged on the four sides of the blade, and the two blade tips are arranged opposite to each other, and the blade tips are designed to have rounded corners that match the shape of the powder discharge groove.

2. A high-efficiency forming milling cutter for machining a powder discharge groove of a rock drill bit according to claim 1, characterized in that: The arc radius of the rounded corner is R1-R8.

3. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 2, characterized in that: The arc radius of the rounded corner of the tool tip is R3-R5.

4. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 1, characterized in that: The angle between the two cutting edges of each set of cutting edges is 60°-120°.

5. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 4, characterized in that: The angle between the two cutting edges of each set of cutting edges is 60°-90°.

6. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 1, characterized in that: The blade installation position is provided with a mounting groove and a threaded through hole, the center of the blade is provided with a step hole, and the blade is fixed by a countersunk screw after being placed in the mounting groove.

7. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 6, characterized in that: The mounting groove is a V-shaped groove, and the angle between the two groove edges of the V-shaped groove is the same as the angle between the two edge surfaces of the blade cutting edge, so as to facilitate positioning of the blade.

8. A high-efficiency forming milling cutter for machining a dust removal groove of a rock drill bit according to claim 7, characterized in that: A circular arc avoidance groove is provided at the top corner of the V-shaped groove to prevent the tip of the tool from interfering with the installation groove.

9. The high-efficiency forming milling cutter for machining the dust removal groove of a rock drill bit according to claim 1, characterized in that: The insert is a coated carbide insert.

10. The high-efficiency forming milling cutter for machining the dust removal groove of a rock drill bit according to claim 1, characterized in that: 5-6 blade installation positions are arranged around the cutter disc.

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