Clamping structure of numerical control machining cutter and cutter

Abstract

The utility model discloses a numerical control machining cutter clamping structure and a cutter, and relates to the technical field of machine tool cutters, the numerical control machining cutter clamping structure comprises a cutter holder and a rectangular flange, the cutter holder is used for connecting a machine tool rotating shaft, the rectangular flange is fixedly connected to the lower end of the cutter holder, and the rectangular flange is used for being connected with a cutter body. According to the utility model, the rectangular flange is matched with the tool apron for installation, so that the clamping overhanging is shortened, the rigidity of the tool is enhanced, and the semi-finish turning operation with the allowance below 2mm can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of machine tool technology, specifically relating to a clamping structure and a tool for CNC machining. Background Technology

[0002] The more advanced process currently available is to use CZYV(C2) four-axis linkage precision turning (the V and C2 control axes are only named differently depending on the machine tool).

[0003] The current machine tool tool holder connection, specifically the HSKA63, has an inner support wall that is too thin and insufficient clamping rigidity. Figure 5 As shown, the clamping overhang TL of existing tools is greater than 80mm, usually around 125mm, and the total tool length is more than 160mm. In such cases, insufficient clamping force is often encountered, resulting in cutting vibration. Utility Model Content

[0004] The purpose of this utility model is to provide a clamping structure for CNC machining tools to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a clamping structure for CNC machining tools, including a tool holder and a rectangular flange. The tool holder is used to connect to the machine tool's rotating shaft, and the rectangular flange is fixedly connected to the lower end of the tool holder and is used to connect to the tool body.

[0006] It should be noted in the design that a bridge-type pressure plate is provided on the side of the rectangular flange. The bridge-type pressure plate is used to clamp the tool on the side of the rectangular flange.

[0007] It is worth noting that the tool body includes a blade plate, which includes a base plate and an extension arm, with the blade mounted at the front end of the extension arm.

[0008] The mounting surface of the substrate is attached to the rectangular flange, and the bridge-type pressure plate clamps and limits the substrate and the rectangular flange in the vertical direction from the side. The position of the substrate is adjustable along the setting direction of the bridge-type pressure plate.

[0009] Furthermore, it should be noted that the side of the mounting surface of the rectangular flange and the base plate is provided with an outwardly protruding stepped surface, which abuts against the side of the base plate, and the stepped surface is parallel to the setting direction of the bridge pressure plate.

[0010] Furthermore, it should be noted that the blade and the rectangular flange are reinforced and fixed with screws. The blade has a fixing hole at the end, and the lateral position of the screw is adjustable. The corresponding position on the rectangular flange has a threaded hole. During installation, the screw passes through the fixing hole and is connected and fixed with the threaded hole.

[0011] Further need to explain is, the middle part of the knife plate is provided with a positioning mandrel, the corresponding position of the rectangular flange is provided with a positioning hole matched with the positioning mandrel, and the transverse position of the positioning mandrel on the positioning hole is adjustable.

[0012] Further need to explain is, the rectangular flange is provided with a jacking post adjustable mechanism, and the jacking post adjustable mechanism is used for adjusting the position of the knife plate relative to the knife holder in the direction perpendicular to the main shaft.

[0013] The jacking post adjustable mechanism comprises a first jacking post and a second jacking post arranged on the same axis, the first jacking post and the second jacking post are both screw-connected in a threaded groove formed in the rectangular flange, the threaded groove intersects with the positioning hole, and the first jacking post and the second jacking post clamp the positioning mandrel passing through the positioning hole.

[0014] Further need to explain is, the size of the rectangular flange is 90mm*80mm.

[0015] Further need to explain is, a distance from the interface end of the knife holder and the rotating shaft of the machine tool to the bottom of the screw structure is defined as the clamping overhang, and the clamping overhang is less than 80mm.

[0016] The utility model discloses still propose a kind of using method of slotting tool, with the interface end of the knife holder and the rotating shaft of the machine tool as starting point, with the blade end of tool as midpoint, a distance is defined as tool total length, tool total length is less than or equal to 160mm.

[0017] The utility model discloses still disclose a kind of tool, using the clamping structure of the numerical control machining tool of above-mentioned, tool body is skived slotting tool or screw rod fine slotting tool.

[0018] Compared with prior art, the clamping structure of the numerical control machining tool provided by the utility model has at least the following beneficial effects:

[0019] The utility model shortens clamping overhang by rectangular flange cooperation knife holder installation, tool rigidity is enhanced, and semi-fine turning operation of 2mm below excess can be realized. DETAILED DESCRIPTION

[0020] Figure 1 It is overall structure schematic diagram of the utility model;

[0021] Figure 2 It is jacking post adjustable mechanism structure schematic diagram of the utility model;

[0022] Figure 3 It is knife plate installation structure schematic diagram of the utility model;

[0023] Figure 4 It is use scene schematic diagram of the utility model;

[0024] Figure 5A schematic view of an existing tool structure.

[0025] Figure 6 A schematic view of the relationship between the blade position of the existing tool and the V / C2 axis.

[0026] Figure 7 A schematic view of the application of the utility model in plane scraping. DETAILED DESCRIPTION

[0027] Referring to Figures 1-5 , the utility model provides a kind of clamping structure of numerical control machining tool.

[0028] Including tool holder 1 and rectangular flange 3, tool holder 1 is used to connect machine tool rotating shaft, rectangular flange 3 is fixedly connected in the lower end of tool holder 1, and rectangular flange 3 is used to be connected with tool body.

[0029] The side of rectangular flange 3 is provided with bridge clamp 2, bridge clamp 2 is used to clamp tool in the bottom of rectangular flange 3, and tool has the adjustability of horizontal sliding relative to rectangular flange 3.

[0030] Referring to Figures 1-4 , tool body includes tool plate 4, tool plate 4 includes base plate 41 and extension arm 42, blade 5 is installed in the front end position of extension arm 42;

[0031] Base plate 41 is attached with the mounting surface of rectangular flange 3, bridge clamp 2 is clamped and limited in vertical direction from side to base plate 41 and rectangular flange 3, and the position of base plate 41 has sliding adjustability along the setting direction of bridge clamp 2.The side of rectangular flange 3 and the mounting surface of base plate 41 is provided with outwardly protruding step surface 31, step surface 31 is in abutment with the side of base plate 41, and step surface 31 is parallel with the setting direction of bridge clamp 2.Tool plate 4 and the end of rectangular flange 3 are also fixed by screw structure 6, and the end of tool plate 4 is provided with fixed hole 61, the transverse position of screw structure 6 on fixed hole 61 is adjustable, and the corresponding position on rectangular flange 3 is provided with threaded hole 35, and when installation, screw structure 6 is connected and fixed by passing through fixed hole 61 and threaded hole.

[0032] It is worth mentioning that, in the embodiment, a plane 90x80mm rectangular flange is used, and a 0°-30° dovetail structure support and a 3xM8 threaded bridge clamp are selected below, which greatly improves the connection rigidity.On the basis of rigidity improvement, the blade adopts R<1 tool tip and R5~+ finishing edge design, which reduces residual area, improves processing efficiency and surface roughness.

[0033] Specifically, the middle part of bridge clamp 2 is fixed in the limiting hole 32 opened in the side of rectangular flange 3 by fastening bolt, and the bottom of bridge clamp 2 and base plate 41 are supported and clamped by dovetail groove structure.

[0034] The function of the bridge-type pressure plate is to provide rigid limiting for the tool plate 4 on the front and rear sides of the horizontal plane, and at the same time, it works with the wedge-shaped dovetail structure to improve the limiting accuracy, and the auxiliary tool position points on the front and rear sides coincide with the axis of rotation of the machine tool. Figure 2 (Point B in the diagram is the knife point).

[0035] Furthermore, it helps to shorten the overhang length of the modular tool connection, which can be controlled within 80mm, preferably 75mm, 76mm, and 77mm. Specifically, in this embodiment, the distance from the end of the interface between the tool holder 1 and the machine tool rotating shaft to the bottom of the screw structure 6 is defined as the clamping overhang, which is less than 80mm.

[0036] Specifically, in this embodiment, the total tool length is defined as the distance from the end of the interface between the tool holder 1 and the machine tool rotating shaft to the end of the blade 5, and the total tool length is less than or equal to 160mm.

[0037] In another preferred embodiment of this utility model,

[0038] Reference Figure 2 as well as Figure 3 As shown, a positioning mandrel 72 is provided in the middle of the blade 4, and a positioning hole 33 matching the positioning mandrel 72 is provided at the corresponding position of the rectangular flange 3. The lateral position of the positioning mandrel 72 on the positioning hole 33 is adjustable.

[0039] The rectangular flange 3 is equipped with a top column adjustable mechanism 7, which is used to adjust the position of the blade plate 4 relative to the blade holder 1 in the direction perpendicular to the main shaft.

[0040] The adjustable top column mechanism 7 includes a first top column 71 and a second top column 73 arranged on the same axis. The first top column 71 and the second top column 73 are both threadedly connected in the threaded groove 34 opened inside the rectangular flange 3. The threaded groove 34 intersects with the positioning hole 33. The first top column 71 and the second top column 73 clamp the positioning mandrel 72 that passes through the positioning hole 33.

[0041] Reference Figure 6 As shown, Figure 6 The cutting edge position of the existing tool and the V / C2 axis ( Figure 1 as well as Figure 4 Point A in the diagram represents the V / C2 axis (i.e., the axis of the machine tool's rotating axis), with a distance De lta > 20mm. When the electric spindle drives the V(C2) axis at extremely low speeds, its torque is extremely low, typically less than 5Nm, generating deflection torque resistance, thus ensuring smooth deflection and accuracy of V(C2). Even with improvements in the insert mounting position, the problem persists due to factors such as tool manufacturing errors, tool deflection under force, theoretical offset of different fillet tips, and tool wear. For example... Figure 5As shown, in this process, it is found that the machine tool physical structure and numerical control ability are limited, the V(C2) axis linkage deflection is to avoid interference when the helix angle gradually changes, and it also causes new errors of the blade center height in the Y direction. Therefore, the Y axis small linkage is needed in the traditional machining to compensate for the error of the center height, and the precision error caused by the Y axis linkage delay in the Z direction. The reverse of the theoretical design profile of the two meshing workpieces leaves a larger gap, thereby increasing the fluid leakage of the main machine during work, and limiting the energy efficiency ratio.

[0042] This embodiment is designed to be adjustable in the horizontal position, and the tool assembly is adjustable in the horizontal and vertical direction of the spindle within ±3mm before machining. It can eliminate the influence of tool manufacturing errors, tool stress, theoretical bias of different corner tool tips, and tool wear, thereby realizing the "zero adjustment" of the tool tip and tool position point, and further ensuring the tool and machining precision.

[0043] In addition, the existing tool and process scheme cannot be used for fine turning of the steep pitch screw;

[0044] The tool of the embodiment has the function of tool position point adjustment. Under the action of the top column adjustable structure 7, the tool position point is ensured to coincide with the V(C2) axis of the machine tool rotary shaft, and no error is caused by the V(C2) axis deflection or program control delay. Therefore, the fine turning of the steep pitch screw can be realized. In addition, since the small linkage action in the Y axis direction of the machine tool is removed, the CZYVC2 four-axis linkage is simplified to CZVC2 three-axis linkage, which greatly reduces the number of linkage axes and the precision requirement of the machine tool during machining, and facilitates the machining application on the turning and milling combined machine tool.

[0045] In addition, continuing to refer to Figure 5 As shown, when scraping the flat sealing shallow groove, the V(C2) axis is extremely low speed linkage and extremely low torque. Through the adjustable function of the new tool, the tool position point and the midpoint of the tool edge are on the axis of the machine tool rotary shaft, and the theoretical force arm = 0, thereby easily realizing the low speed linkage rotation of the V(C2) axis, and greatly reducing the machining error caused by insufficient torque.

[0046] In addition, referring to Figure 7 As shown, in the scraping machining of the flat end face ring groove or special-shaped groove, the end face groove blade or scraping blade 81 is installed on the tool plate, and the theoretical force arm = 0 and the V(C2) axis theoretical deflection torque = 0 are adjusted, thereby improving the precision of the scraping machining of the flat end face ring groove.

[0047] It is worth mentioning that the device as a whole adopts the design of modular tool holder and tool plate. The tool holder is a non-consumable part and can be universal. The tool plate is designed according to the machining requirement and will be gradually worn and consumed during the machining process. Therefore, the total tool cost is reduced.

Claims

1. A clamping structure for CNC machining tools, characterized in that: The tool holder includes a tool seat (1) for connecting with the rotating shaft of a machine tool and a rectangular flange (3) fixedly connected to the lower end of the tool seat (1) and used for connecting with a tool body. The side of the rectangular flange (3) is provided with a bridge clamp (2) for clamping the tool at the bottom of the rectangular flange (3), and the tool has horizontal sliding adjustability relative to the rectangular flange (3).

2. The chuck structure of a numerical control machining tool according to claim 1, characterized in that: The tool body includes a tool plate (4) including a base plate (41) and an extension arm (42), and a blade (5) is mounted at the front end of the extension arm (42). The base plate (41) is attached to the mounting surface of the rectangular flange (3), and the bridge clamp (2) clamps and limits the base plate (41) and the rectangular flange (3) in the vertical direction from the side, and the position of the base plate (41) has sliding adjustability along the setting direction of the bridge clamp (2).

3. The chuck structure of a numerical control machining tool according to claim 1, characterized in that: The side of the mounting surface of the rectangular flange (3) and the base plate (41) is provided with an outwardly protruding step surface (31), the step surface (31) abuts against the side of the base plate (41), and the step surface (31) is parallel to the setting direction of the bridge clamp (2).

4. The chuck structure of a numerical control machining tool according to claim 2, wherein: The end of the tool plate (4) and the rectangular flange (3) is further fixed by a screw structure (6), the end of the tool plate (4) is provided with a fixing hole (61), the transverse position of the screw structure (6) on the fixing hole (61) is adjustable, and the corresponding position on the rectangular flange (3) is provided with a threaded hole (35), and during installation, the screw structure (6) is connected and fixed through the fixing hole (61) and the threaded hole.

5. A clamping structure for a numerically controlled machine tool according to claim 4, wherein: The middle part of the tool plate (4) is provided with a positioning mandrel (72), and the corresponding position of the rectangular flange (3) is provided with a positioning hole (33) matched with the positioning mandrel (72), and the transverse position of the positioning mandrel (72) on the positioning hole (33) is adjustable.

6. A clamping structure for a numerically controlled machine tool according to claim 4, wherein: The rectangular flange (3) is provided with a top post adjustable mechanism (7) for adjusting the position of the tool plate (4) relative to the tool seat (1) in the direction perpendicular to the main shaft; The top post adjustable mechanism (7) includes a first top post (71) and a second top post (73) arranged on the same axis, the first top post (71) and the second top post (73) are both threadedly connected in a threaded groove (34) formed in the rectangular flange (3), the threaded groove (34) intersects with the positioning hole (33), and the first top post (71) and the second top post (73) clamp the positioning mandrel (72) passing through the positioning hole (33).

7. The chuck structure of a numerical control machining tool according to claim 4, wherein: The size of the rectangular flange (3) is 90mm*80mm.

8. A clamping structure for a numerically controlled machine tool according to claim 7, characterized in that: A distance from the interface end of the tool seat (1) and the rotating shaft of the machine tool to the bottom of the screw structure (6) is defined as the clamping overhang, and the clamping overhang is less than 80mm.

9. A clamping structure for a numerically controlled machine tool according to claim 7 or 8, characterised in that: A distance from the interface end of the tool seat (1) and the rotating shaft of the machine tool to the end of the blade of the tool is defined as the total length of the tool, and the total length of the tool is less than or equal to 160mm.

10. A cutting tool characterized by: A clamping structure of a numerical control machining tool is adopted, the tool body is a slot scraping tool or a screw rod fine turning slot tool.

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