A rough-fine compound corn milling cutter

Abstract

This utility model discloses an indexable roughing and finishing composite corn milling cutter, comprising a cutter body, a cutter shank fixedly mounted at the end of the cutter body, three spiral stepped grooves evenly distributed around the axis on the outer side wall of the cutter body, a plurality of roughing inserts sequentially mounted on the stepped surface of the spiral stepped grooves, the foremost roughing insert protruding from the end face of the cutter body, a clearance hole provided on the spiral stepped groove, and chip removal grooves provided on both the upper and lower sides of the clearance hole; a PCD insert, fixedly mounted on the outer side wall of the cutter body on one side of the roughing inserts, and a water outlet hole provided in the middle of the cutter body along its axial direction, the water outlet hole penetrating the cutter body and the cutter shank. This utility model can solve the problems of existing milling cutters in machining subframes, such as long repetitive positioning cycle time in roughing and finishing side milling, thin wall and poor rigidity of the subframe after roughing, and easy vibration during finishing, which affect machining efficiency and product surface quality.

Description

Technical Field

[0001] This utility model relates to the field of milling tool technology, specifically to an indexable roughing and finishing composite corn milling cutter. Background Technology

[0002] In the field of new energy vehicle manufacturing, the subframe, as a key load-bearing component, directly affects the assembly accuracy and production capacity of the entire vehicle through the machining quality and efficiency of its opening surfaces. Due to the large number of openings in the subframe, existing composite milling cutters often cannot machine deep opening surfaces, requiring side milling with end mills. Side milling necessitates separate roughing and finishing cutters, with repeated tool positioning for multiple openings, extending the machining cycle time and significantly impacting production capacity. After roughing, the opening surfaces become thin-walled, lacking sufficient rigidity, and it is difficult to effectively improve rigidity by adding support clamping points. This leads to vibration during finishing, affecting the product's appearance quality and dimensional accuracy. Therefore, to solve the aforementioned problem of balancing efficiency and quality, we propose an indexable roughing-finishing composite end mill. Utility Model Content

[0003] This invention can solve the problems of existing milling cutters when machining subframes, such as long repetitive positioning cycles in rough and finish side milling, thin walls and poor rigidity of the subframe after roughing, and easy vibration during finish machining, which affect machining efficiency and product surface quality.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an indexable roughing and finishing composite corn milling cutter, comprising a cutter body, a cutter shank fixedly mounted at the end of the cutter body, three spiral stepped grooves evenly distributed around the axis on the outer side wall of the cutter body, a plurality of roughing inserts sequentially mounted on the stepped surface of the spiral stepped grooves, the foremost roughing insert protruding from the end face of the cutter body, a clearance hole provided between adjacent roughing inserts on the cutter body, and chip removal grooves provided on both the upper and lower sides of the clearance hole; a PCD insert, fixedly mounted on the outer side wall of the cutter body on one side of the roughing insert, the outer edge of the PCD insert protruding from the edge of the roughing insert; a water outlet hole is provided in the middle of the cutter body along its axial direction, the water outlet hole penetrating the cutter body and the cutter shank; a cooling channel is provided on the chip removal groove near the roughing insert, the cooling channel being connected to the water outlet hole.

[0005] As a supplement to the technical solution described in this utility model, one end of the roughing insert is a mounting surface that mates with the spiral stepped groove, and the other end is a cutting surface, which is larger than the mounting surface. There are four inclined surfaces between the two. The roughing insert is generally frustum-shaped, gradually tapering from the cutting surface to the mounting surface. The mounting surface precisely mates with the spiral stepped groove and is secured with fixing bolts. The frustum-shaped structure allows the roughing insert to better fit the bottom of the groove during installation, forming a tight fit. Compared to a flat insert, the frustum-shaped structure prevents radial displacement or loosening of the insert under cutting force, ensuring installation accuracy and reliability, and extending the insert's service life.

[0006] As a supplement to the technical solution described in this utility model, the cutting surface is provided with an indentation, the center of which is provided with a mounting hole, a fixing bolt passing through the mounting hole, and the bottom of the spiral stepped groove is provided with a threaded hole that mates with the fixing bolt. The fixing bolt passes through the mounting hole and mates with the threaded hole to fix the roughing tool on the tool body.

[0007] As a supplement to the technical solution described in this utility model, a connecting part is fixedly connected to one side of the PCD blade at the foremost end. This connecting part is fixedly connected to the blade body and cooperates with the roughing blade that extends beyond the blade body.

[0008] As a supplement to the technical solution described in this utility model, the inner side of both the PCD cutting tool and the connecting part is provided with a first groove that matches the edge shape of the roughing cutting tool. The first groove cooperates with the edge of the roughing cutting tool to limit the roughing cutting tool, so that it can cut more accurately during the finishing process.

[0009] As a supplement to the technical solution described in this utility model, a plug is provided at the end of the water outlet hole away from the tool holder. The plug prevents coolant from leaking from the end of the water outlet hole, ensuring that the coolant is sprayed at sufficient pressure to the cutting position of the roughing tool and the PCD tool, thereby enhancing the cooling and lubrication effect and reducing tool wear and cutting temperature.

[0010] As a supplement to the technical solution described in this utility model, the PCD insert and the tool body are connected by welding. The welding method enables the PCD insert and the tool body to be firmly combined. In milling, it can withstand greater cutting force and vibration, and avoid problems such as insert loosening or falling off.

[0011] As a supplement to the technical solution described in this utility model, the tool body and tool holder are integrally formed and made of cemented carbide. The integral forming ensures the structural strength of the tool body and tool holder and improves cutting stability. The cemented carbide material reduces the impact of thermal deformation on tool accuracy under high-temperature cutting environments and has high wear resistance.

[0012] As a supplement to the technical solution described in this utility model, the roughing blade is made of cemented carbide, which has high wear resistance.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] By designing roughing inserts and PCD inserts, the roughing insert first mills away the large allowance, while the PCD insert finishes the small allowance. Roughing and finishing are performed simultaneously, completing the roughing and finishing of multiple facets in a single pass. No tool changes are required, and the product is repeatedly positioned, significantly shortening the machining cycle time and greatly improving machining efficiency. This solves the problems of existing milling cutters when machining subframes, such as long cycle times for roughing and finishing side milling, poor rigidity due to thin walls after roughing, and easy tool vibration during finishing, which affect machining efficiency and product surface quality. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a front sectional view of the present invention;

[0017] Figure 3 This is a three-dimensional structural diagram of the blade and handle of this utility model;

[0018] Figure 4 This is a cross-sectional view of the blade body of this utility model;

[0019] Figure 5 This is a three-dimensional structural diagram of the roughing blade of this utility model;

[0020] Figure 6 A three-dimensional structural diagram of the roughing blades of this utility model at different angles;

[0021] Figure 7 This is a three-dimensional structural diagram of the connecting part of this utility model;

[0022] Figure 8 This is a schematic diagram of the first slot structure of this utility model;

[0023] Figure 9 This is a schematic diagram of the processing state structure of this utility model.

[0024] Figure label:

[0025] 1. Tool body, 2. Tool holder, 3. Spiral stepped groove, 31. Threaded hole, 4. Roughing insert, 41. Mounting surface, 42. Cutting surface, 43. Bevel, 44. Concave, 45. Mounting hole, 5. Clearance hole, 6. Chip removal groove, 7. PCD insert, 71. First slot, 72. Connecting part, 8. Water outlet, 9. Cooling channel, 10. Fixing bolt, 11. Plug. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0027] The embodiments of this utility model relate to an indexable roughing and finishing composite corn milling cutter, such as... Figure 1-9 As shown, the tool includes a tool body 1, with a tool holder 2 fixedly mounted at its end. Three spiral stepped grooves 3 are evenly distributed around the axis on the outer side wall of the tool body 1. Several roughing blades 4 are sequentially arranged on the stepped surfaces of the spiral stepped grooves 3. The foremost roughing blade 4 protrudes from the end face of the tool body 1. A clearance hole 5 is provided between adjacent roughing blades 4 on the tool body 1 to allow the indexing tip of the roughing blade 4 to pass. Chip removal grooves 6 are provided on both the upper and lower sides of the clearance hole 5. A PCD blade 7 is fixedly mounted on the outer side wall of the tool body 1, located on one side of the roughing blade 4. The outer edge of the PCD blade 7 protrudes from the edge of the roughing blade 4. A water outlet 8 is provided in the middle of the tool body 1 along its axial direction, penetrating both the tool body 1 and the tool holder 2. A cooling channel 9 is provided on the chip removal groove 6 near the roughing blade 4, and this cooling channel 9 is connected to the water outlet 8.

[0028] In this embodiment, as Figure 5-6 As shown, one end of the roughing insert 4 is a mounting surface 41 that mates with the spiral stepped groove 3, and the other end is a cutting surface 42. The cutting surface 42 is larger than the mounting surface 41, and there are four inclined surfaces 43 between them. The roughing insert 4 is generally frustum-shaped, gradually tapering from the cutting surface 42 to the mounting surface 41. The mounting surface 41 precisely mates with the spiral stepped groove 3 and is secured with fixing bolts 10. The frustum-shaped structure allows the roughing insert 4 to better fit the bottom of the groove during installation, forming a tight fit. Compared to flat inserts, the frustum-shaped structure prevents radial displacement or loosening of the insert under cutting force, ensuring installation accuracy and reliability, and extending the service life of the insert.

[0029] In this embodiment, as Figure 3 and Figure 5 As shown, the cutting surface 42 is provided with an inner recess 44, and the center of the inner recess 44 is provided with a mounting hole 45. A fixing bolt 10 passes through the mounting hole 45. The bottom of the spiral stepped groove 3 is provided with a screw hole 31 that mates with the fixing bolt 10. The fixing bolt 10 passes through the mounting hole 45 and mates with the screw hole 31 to fix the roughing cutter 4 on the cutter body 1.

[0030] In this embodiment, as Figure 7As shown, a connecting part 72 is fixedly connected to one side of the PCD blade 7 at the foremost end. The connecting part 72 is fixedly connected to the blade body 1 and cooperates with the roughing blade 4 that extends beyond the blade body 1.

[0031] In this embodiment, as Figure 7-8 As shown, the inner sides of the PCD blade 7 and the connecting part 72 are provided with a first groove 71 that matches the edge shape of the roughing blade 4. The first groove 71 cooperates with the edge of the roughing blade 4 to limit the roughing blade 4, so that it can cut more accurately during the finishing process.

[0032] In this embodiment, as Figure 2 As shown, a plug 11 is provided at the end of the water outlet 8 away from the tool holder 2. The plug 11 prevents coolant from leaking from the end of the water outlet 8, ensuring that the coolant is sprayed at a sufficient pressure to the cutting position of the roughing insert 4 and the PCD insert 7, thereby enhancing the cooling and lubrication effect and reducing tool wear and cutting temperature.

[0033] In this embodiment, as Figure 1 As shown, the PCD insert 7 is connected to the tool body 1 by welding. The welding method enables the PCD insert 7 and the tool body 1 to be firmly combined. During milling, it can withstand greater cutting forces and vibrations, and avoid problems such as insert loosening or falling off.

[0034] In this embodiment, as Figure 1 As shown, the tool body 1 and tool holder 2 are integrally formed and made of cemented carbide. The integral forming ensures the structural strength of the tool body 1 and tool holder 2 and improves cutting stability. The cemented carbide material reduces the impact of thermal deformation on tool accuracy under high-temperature cutting conditions and has high wear resistance.

[0035] In this embodiment, as Figure 1As shown, a carbide tool body 1 and tool holder 2 are selected for machining. The tool body 1 is 123mm long and 32mm in diameter, and the tool holder 2 is 57mm long and 30.5mm in diameter. Three spiral stepped grooves 3 are evenly distributed around the axis on the outer side wall of the tool body 1. Fourteen indexable roughing inserts 4 are installed on the side wall of the spiral stepped grooves 3. The roughing inserts 4 are frustum-shaped, with one end mounting surface 41 abutting the spiral stepped groove 3. The cutting surface 42 is larger than the mounting surface 41, and there are four inclined surfaces 43 between them. The cutting surface 42 is provided with an indentation 44 and a mounting hole 45. It is connected and fixed to the bottom screw hole 31 of the spiral stepped groove 3 by fixing bolts 10. On the outer side wall of the tool body 1, on the side of the roughing insert 4, a PCD insert 7 is fixed by welding. A connecting part 72 is provided on the frontmost side of the PCD insert 7. The inner side of the PCD insert 7 and the connecting part 72 are provided with a first groove 71 that matches the edge shape of the roughing insert 4. A water outlet 8 is axially formed in the middle of the tool body 1, penetrating both the tool body 1 and the tool holder 2. A cooling channel 9, connected to the water outlet 8, is formed on the chip removal groove 6 near the roughing insert 4. A plug 11 is provided at the end of the water outlet 8 away from the tool holder 2. Coolant is sprayed through the water outlet 8 and the cooling channel 9 onto the cutting positions of the roughing insert 4 and the PCD insert 7, enhancing cooling and lubrication, reducing tool wear and cutting temperature. During machining, the roughing insert 4 first performs a large-mass cut on the workpiece, and the chip removal groove 6 promptly removes the chips; the PCD insert 7 then performs finishing. When the cutting edge of the roughing insert 4 wears, it can be indexed and replaced for continued use; when a single roughing insert 4 is damaged, it can be replaced individually, reducing tool wear costs.

[0036] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0037] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. An indexable roughing and finishing composite corn milling cutter, characterized in that, include: The blade body (1) has a handle (2) fixedly installed at its end. Three spiral stepped grooves (3) are evenly distributed around the axis on the outer side wall of the blade body (1). Several roughing blades (4) are arranged sequentially on the stepped surface of the spiral stepped grooves (3). The roughing blade (4) at the front end protrudes from the end face of the blade body (1). A clearance hole (5) is provided between the upper and lower adjacent roughing blades (4) on the blade body (1). Chip removal grooves (6) are provided on both the upper and lower sides of the clearance hole (5). PCD blade (7) is fixedly disposed on the outer side wall of the blade body (1) on one side of the roughing blade (4), and the outer edge of the PCD blade (7) protrudes from the edge of the roughing blade (4). The blade body (1) has a water outlet hole (8) in the middle along its axial direction, and the water outlet hole (8) passes through the blade body (1) and the handle (2); A cooling channel (9) is provided on the chip removal groove (6) near the roughing blade (4), and the cooling channel (9) is connected to the water outlet (8).

2. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: One end of the roughing blade (4) is a mounting surface (41) that connects with the spiral stepped groove (3), and the other end is a cutting surface (42). The cutting surface (42) is larger than the mounting surface (41), and there are four inclined surfaces (43) between them. The roughing blade (4) as a whole is a frustum shape that gradually tapers from the cutting surface (42) to the mounting surface (41).

3. The indexable roughing and finishing composite corn milling cutter according to claim 2, characterized in that: The cutting surface (42) is provided with an indentation (44), and the center of the indentation (44) is provided with an installation hole (45). A fixing bolt (10) is inserted inside the installation hole (45), and the bottom of the spiral stepped groove (3) is provided with a screw hole (31) that mates with the fixing bolt (10).

4. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: A connecting part (72) is fixedly connected to one side of the PCD blade (7) at the foremost end, and the connecting part (72) is fixedly connected to the blade body (1).

5. The indexable roughing and finishing composite corn milling cutter according to claim 4, characterized in that: The inner sides of the PCD blade (7) and the connecting part (72) are provided with a first groove (71) that matches the edge shape of the roughing blade (4).

6. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: A plug (11) is provided at the end of the water outlet (8) away from the handle (2).

7. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: The PCD blade (7) is connected to the blade body (1) by welding.

8. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: The blade body (1) and the handle (2) are integrally formed and made of cemented carbide.

9. The indexable roughing and finishing composite corn milling cutter according to claim 1, characterized in that: The roughing blade (4) is made of cemented carbide.

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