Drill bit deviation preventing and fixing device of numerical control drilling machine

Abstract

The utility model relates to numerical control drilling machine technical field, and disclose a kind of drill bit anti-deviation fixing device of numerical control drilling machine, the drill bit anti-deviation fixing device of numerical control drilling machine, including three-jaw chuck, three sets of clamping claws for clamping fixed drill bit are provided on three-jaw chuck;Further including anti-deviation mechanism, anti-deviation mechanism includes the rotating shaft stem being set in the inside of clamping jaw, and the bottom of rotating shaft stem is penetrated through the bottom of clamping jaw, and the outside of rotating shaft stem is fixed with oval block.Early clamping drill bit by clamping jaw, rotating rotating shaft stem and oval block, oval block is in contact with resistance block, and push nickel-titanium memory alloy block to stick to drill bit, the friction heat of high-speed rotation of drill bit makes nickel-titanium memory alloy block swell, forms radial pre-tightening force to drill bit from three directions, limit fixed drill bit and inhibit deviation, applicable to high hardness material rough processing, improve drill bit feed amount.

Description

Technical Field

[0001] This utility model relates to the field of CNC drilling machine technology, specifically to a drill bit anti-deviation fixing device for CNC drilling machines. Background Technology

[0002] CNC drilling machines are widely used in the processing of metals and other materials. In the roughing stage of material processing, the drill bit is the core tool for hole processing. Its main function is to cut metals and other materials by high-speed rotation, quickly remove excess material to form a preliminary hole structure, and meet the demand for rapid hole structure forming in mass production.

[0003] When using a drill bit for machining, a three-jaw chuck is required to fix the drill bit in place. When the three-jaw chuck rotates at high speed, the radial runout of the drill bit caused by vibration is large, which will cause the drilling dimensional accuracy to exceed the tolerance and the surface roughness of the hole wall to deteriorate. This makes it unsuitable for rough machining of high-hardness materials and pre-machining of excessively deep grooves. Therefore, it is urgent to develop a drill bit anti-deviation fixing device for CNC drilling machines to solve these practical problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a drill bit anti-deviation fixing device for CNC drilling machines, which solves the technical problem that when a three-jaw chuck rotates at high speed, the radial runout of the drill bit caused by vibration is large, which will cause the drilling dimensional accuracy to exceed the tolerance and the surface roughness of the hole wall to deteriorate.

[0005] To achieve the above objectives, this utility model provides a drill bit anti-deviation fixing device for a CNC drilling machine through the following technical solution: a three-jaw chuck with three sets of jaws for clamping and fixing the drill bit.

[0006] It also includes an anti-deviation mechanism, which includes a rotating shaft inside the jaw, with the bottom end of the rotating shaft penetrating the bottom of the jaw. An elliptical block is fixed to the outside of the rotating shaft. A nickel-titanium shape memory alloy block is embedded in one side of the inside of the jaw. The nickel-titanium shape memory alloy block is used to further limit and fix the drill bit. An abutment block is fixed to the back of the nickel-titanium shape memory alloy block. Elastic components are also provided at the top and bottom inside the jaw to drive the nickel-titanium shape memory alloy block to reset and move.

[0007] Preferably, the abutting block and the elliptical block are horizontally corresponding and connected in abutting contact.

[0008] Preferably, the elastic component includes a fixing plate disposed at the top and bottom inside the claw, a spring fixedly connected to one side of the fixing plate, one end of the spring being fixedly connected to the back of the abutment block, and the other end being fixedly connected to the fixing plate.

[0009] Preferably, the bottom end of the rotating shaft is further provided with a force-saving lever assembly, the force-saving lever assembly including a fixing sleeve fixed to the bottom end of the rotating shaft, a handle is installed on one side of the fixing sleeve by a positioning bolt, and the handle is located on the bottom side of the pawl; a locking member for limiting the rotation position of the rotating shaft is threaded on one side of the bottom end of the rotating shaft.

[0010] Preferably, the bottom of the fixing sleeve is also provided with a pointer, and a scale ring for use with the pointer is embedded on one side of the bottom of the claw.

[0011] Preferably, a connecting plate is fixedly connected to the bottom of the three-jaw chuck, and the connecting plate has mounting holes equidistantly spaced inside for connecting with the spindle of a CNC drilling machine.

[0012] This invention provides a drill bit anti-deviation fixing device for CNC drilling machines. Compared with the prior art, it has the following advantages.

[0013] 1. The jaws initially clamp the drill bit. The rotating shaft and elliptical block rotate, causing the elliptical block to contact the contact block, pushing the nickel-titanium shape memory alloy block to adhere to the drill bit. The frictional heat from the high-speed rotation of the drill bit causes the nickel-titanium shape memory alloy block to expand, forming a radial preload on the drill bit from three directions. This limits and fixes the drill bit, suppressing deviation. This solves the problem of radial deviation of the drill bit due to vibration when the traditional three-jaw chuck rotates at high speed, reduces runout, is suitable for rough machining of high-hardness materials, and increases the drill bit feed rate.

[0014] 2. The operator inserts the handle into the fixing sleeve, tightens the positioning bolt, and pushes the handle to rotate the shaft rod half a revolution. The pointer and scale ring are used to ensure that the three sets of nickel-titanium shape memory alloy blocks move the same distance, so that the drill bit is centered. The locking piece is tightened to fix the shaft rod, so as to realize the precise and symmetrical limit of the drill bit by the anti-deviation mechanism. This solves the problem of drill bit eccentricity caused by inconsistent movement of the limit parts during manual operation, improves the coaxiality of clamping, and stabilizes the anti-deviation effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the appearance of the present utility model;

[0016] Figure 2 This is a partial schematic diagram of the chuck claw of this utility model;

[0017] Figure 3 This is a schematic diagram showing the installation position of the anti-deviation mechanism of this utility model;

[0018] Figure 4 This is a partial schematic diagram of the anti-deviation mechanism of this utility model;

[0019] Figure 5 This is a partially enlarged schematic diagram of the anti-deviation mechanism of this utility model.

[0020] In the diagram: 1. Three-jaw chuck; 101. Jaw; 2. Anti-offset mechanism; 201. Rotating shaft; 202. Elliptical block; 203. Nickel-titanium shape memory alloy block; 204. Abutment block; 205. Fixing plate; 206. Spring; 207. Force-saving lever assembly; 2071. Fixing sleeve; 2072. Handle; 2073. Positioning bolt; 2074. Locking element; 208. Pointer; 209. Scale ring; 3. Connecting plate; 301. Mounting hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] First implementation method:

[0023] refer to Figure 1-5 A drill bit anti-deviation fixing device for a CNC drilling machine includes a three-jaw chuck 1, on which three sets of jaws 101 are provided for clamping and fixing the drill bit.

[0024] It also includes an anti-deviation mechanism 2, which includes a rotating shaft 201 disposed inside the jaw 101, with the bottom end of the rotating shaft 201 penetrating the bottom of the jaw 101. An elliptical block 202 is fixedly connected to the outside of the rotating shaft 201. A nickel-titanium memory alloy block 203 is embedded and installed on one side of the inside of the jaw 101. The nickel-titanium memory alloy block 203 is used to further limit and fix the drill bit. An abutment block 204 is fixedly connected to the back of the nickel-titanium memory alloy block 203. Elastic components are also provided at the top and bottom inside the jaw 101 to drive the nickel-titanium memory alloy block 203 to reset and move.

[0025] The abutting block 204 and the elliptical block 202 are horizontally corresponding and abutting each other. The elastic component includes a fixing plate 205 disposed at the top and bottom of the jaw 101. A spring 206 is fixedly connected to one side of the fixing plate 205. One end of the spring 206 is fixedly connected to the back of the abutting block 204 and the other end is fixedly connected to the fixing plate 205. A connecting plate 3 is fixedly connected to the bottom of the three-jaw chuck 1. The connecting plate 3 has mounting holes 301 equidistantly opened inside for connecting to the spindle of a CNC drilling machine.

[0026] The three-jaw chuck 1 can be easily connected to an external CNC machine tool for installation by using the connecting plate 3 in conjunction with the mounting hole 301. After the drill bit is placed inside the three-jaw chuck 1, the internal flat threaded plate is driven by rotating the external wrench to move the three jaws 101 radially in sync, thus achieving the initial clamping of the drill bit.

[0027] Rotating the rotating shaft 201 and the elliptical block 202 causes the elliptical block 202 to abut against the abutting block 204, pushing the nickel-titanium memory alloy block 203 to move outward and fit against the drill bit. At the same time, the spring 206 is compressed. The frictional heat generated by the high-speed rotation of the drill bit causes the nickel-titanium memory alloy block 203 to expand and form a radial preload on the drill bit. The three sets of nickel-titanium memory alloy blocks 203 limit and fix the drill bit from three directions to suppress deviation.

[0028] This invention solves the problem of radial displacement of the drill bit caused by vibration during high-speed rotation of the traditional three-jaw chuck 1, reduces the radial runout of the drill bit, is suitable for rough machining of high-hardness materials, and increases the feed rate of the drill bit in rough machining of high-hardness materials. The reverse rotation of the handle 2072 drives the elliptical block 202 to reset, and the high elasticity of the spring 206 pushes the nickel-titanium shape memory alloy block 203 to release the constraint.

[0029] Second implementation method:

[0030] When operating manually, the movement of the three sets of limiting components is prone to inconsistency, which can lead to drill bit eccentricity and reduce clamping coaxiality.

[0031] refer to Figure 4-5 In the second embodiment of this utility model, a force-saving lever assembly 207 is also provided at the bottom end of the rotating shaft 201. The force-saving lever assembly 207 includes a fixing sleeve 2071 fixed to the bottom end of the rotating shaft 201. A handle 2072 is installed on one side of the fixing sleeve 2071 through a positioning bolt 2073, and the handle 2072 is located on the bottom side of the claw 101. A locking member 2074 for limiting the rotation position of the rotating shaft 201 is threadedly installed on one side of the bottom end of the rotating shaft 201.

[0032] The bottom of the fixed sleeve 2071 is also provided with a pointer 208, and a scale ring 209 for use with the pointer 208 is embedded on one side of the bottom of the claw 101.

[0033] After the operator inserts the handle 2072 into the fixing sleeve 2071, rotates the positioning bolt 2073 to fix the position of the handle 2072, and pushes the handle 2072 to drive the rotating shaft 201 to rotate half a revolution. The position of the elliptical block 202 against the contact block 204 is determined by the pointer 208 corresponding to the scale ring 209, ensuring that the three sets of nickel-titanium memory alloy blocks 203 move the same distance to ensure that the drill bit is centered. After rotating the locking part 2074 to fix the position of the rotating shaft 201, the precise and symmetrical limiting function of the drill bit is realized. This solves the problem of drill bit eccentricity caused by inconsistent movement of the three sets of limiting parts during manual operation, and achieves excellent results in improving clamping coaxiality and ensuring stable anti-deviation effect.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drill bit anti-deviation fixing device for a CNC drilling machine, comprising a three-jaw chuck (1), wherein the three-jaw chuck (1) is provided with three sets of jaws (101) for clamping and fixing the drill bit, characterized in that: It also includes an anti-deviation mechanism (2), which includes a rotating shaft (201) disposed inside the jaw (101), and the bottom end of the rotating shaft (201) penetrates the bottom of the jaw (101). An elliptical block (202) is fixed to the outside of the rotating shaft (201). A nickel-titanium memory alloy block (203) is embedded in one side of the inside of the jaw (101). The nickel-titanium memory alloy block (203) is used to further limit and fix the drill bit. An abutment block (204) is fixed to the back of the nickel-titanium memory alloy block (203). Elastic components are also provided at the top and bottom inside the jaw (101) to drive the nickel-titanium memory alloy block (203) to reset and move.

2. The drill bit anti-deviation fixing device for a CNC drilling machine according to claim 1, characterized in that: The abutting block (204) and the elliptical block (202) are horizontally corresponding and are connected in abutting contact.

3. The drill bit anti-deviation fixing device for a CNC drilling machine according to claim 1, characterized in that: The elastic component includes a fixing plate (205) disposed at the top and bottom inside the claw (101). A spring (206) is fixedly connected to one side of the fixing plate (205). One end of the spring (206) is fixedly connected to the back of the abutment block (204), and the other end is fixedly connected to the fixing plate (205).

4. The drill bit anti-deviation fixing device for a CNC drilling machine according to claim 1, characterized in that: The bottom end of the rotating shaft (201) is also provided with a force-saving lever assembly (207). The force-saving lever assembly (207) includes a fixing sleeve (2071) fixed to the bottom end of the rotating shaft (201). A handle (2072) is installed on one side of the fixing sleeve (2071) by a positioning bolt (2073), and the handle (2072) is located on the bottom side of the pawl (101). A locking member (2074) for limiting the rotation position of the rotating shaft (201) is threaded on one side of the bottom end of the rotating shaft (201).

5. The drill bit anti-deviation fixing device for a CNC drilling machine according to claim 4, characterized in that: The bottom of the fixed sleeve (2071) is also provided with a pointer (208), and a scale ring (209) for use with the pointer (208) is embedded on one side of the bottom of the claw (101).

6. The drill bit anti-deviation fixing device for a CNC drilling machine according to claim 1, characterized in that: The bottom of the three-jaw chuck (1) is fixedly connected to a connecting plate (3), and the connecting plate (3) has mounting holes (301) equidistantly spaced inside for connecting to the spindle of a CNC drilling machine.

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