Multifunctional fine-adjustable micro part clamping device for numerical control grinding machine

Abstract

The utility model relates to a multifunctional fine-adjustable tiny part clamping device for a numerical control grinding machine. The multifunctional fine-adjustable tiny part clamping device comprises a connecting shaft and an elastic chuck assembly. The elastic chuck assembly comprises a chuck seat, a spring chuck and a spring chuck cover; the connecting shaft is in positioning fit with a machine tool spindle taper hole through a taper shank in the middle and is tensioned and fixed to a locking component on a machine tool spindle through tensioning threads at the left end. The chuck seat is embedded and fixedly connected with an inner hole in the right end of the connecting shaft in the axial direction and the radial direction in a fine adjustment manner through a left-end disc; the spring chuck is in coaxial positioning fit with a chuck taper hole in the chuck seat through the right end conical surface of the spring chuck, the spring chuck cover is connected with a right end chuck locking thread on the chuck seat through an inner left end locking thread, and the inner right end conical surface of the spring chuck cover is in positioning fit with the left end conical surface of the spring chuck. And the part is clamped and fixed in the inner hole of the spring chuck. According to the device, quick self-centering clamping of micro shaft parts is achieved, positioning is accurate, clamping is reliable, and adjustment is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-efficiency and high-precision numerical control processing, and specifically relates to a multifunctional fine-adjustable tiny parts clamping device for a numerical control grinder and a use method thereof. Background Art

[0002] In the field of inertial navigation, the ball shaft is one of the main parts of the liquid floating gyroscope ( Figure 1 The ball head is a typical high-precision micro-part. Due to its high surface quality and hardness, a high-precision CNC grinder is generally used to process the ball head. Since the CNC grinder spindle clamping accessories are large, there are the following disadvantages in daily processing:

[0003] 1. The standard clamping accessories that come with the equipment cannot meet the clamping requirements of high-precision tiny parts;

[0004] 2. When clamping parts through tooling, the connection sequence is spindle - three-claw - tooling - parts, which results in large cumulative errors. At the same time, excessive overhang can easily lead to poor rigidity.

[0005] 3. The tooling has a single function and requires frequent alignment and switching during replacement, which takes a long time and has low efficiency. Utility Model Content

[0006] The utility model aims to overcome the deficiencies of the prior art and to provide a multifunctional micro-adjustable micro-part clamping device for a CNC grinder, which can realize rapid self-centering clamping of micro-shaft parts, accurate positioning, reliable clamping and convenient adjustment.

[0007] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0008] A multifunctional fine-adjustable small parts clamping device for a CNC grinder, comprising a connecting shaft and an elastic chuck assembly;

[0009] The connecting shaft is provided with a tapered handle in the middle, a tightening thread is provided at the left end, and a disc-shaped right end is provided with an inner hole at the right end; the connecting shaft is positioned and matched with the tapered hole of the machine tool spindle through the tapered handle in the middle, and is tightened and fixed with the locking accessory on the machine tool spindle through the tightening thread at the left end;

[0010] The elastic chuck assembly comprises a chuck seat, a spring chuck and a spring chuck cover; the left end of the chuck seat is disc-shaped, the right end is provided with a chuck locking thread on the outside, and the right end is provided with a chuck tapered hole on the inside; the spring chuck as a whole is a petal-shaped structure with reverse tapers at both ends, the tapered surface at the right end is a positioning surface, and the inner hole is a part mounting hole; the left end of the spring chuck cover is provided with a locking thread, and the right end is provided with a tapered surface for limiting the position;

[0011] The chuck seat is connected to the right inner hole of the connecting shaft through the left end disc to form a fine-adjustable embedded fixed connection in the axial and radial directions; the spring chuck is inserted and matched with the chuck tapered hole on the chuck seat through its left end tapered surface, and the spring chuck cover is connected with the right end chuck locking thread on the chuck seat through the internal left end locking thread, and the internal right end tapered surface of the spring chuck cover is positioned and matched with the right end tapered surface of the spring chuck, so that the part is clamped and fixed in the inner hole of the spring chuck.

[0012] Moreover, it also includes a disassembly nut, and a right-end thread is arranged on the connecting shaft near the right end, the right-end thread is a disassembly thread, and the disassembly nut is connected to the disassembly thread.

[0013] Moreover, three end face threaded holes are arranged along the circumferential direction on the bottom surface of the inner hole at the right end of the connecting shaft, and four radial threaded holes are evenly arranged along the circumferential direction on the side wall of the inner hole; three screw through holes are evenly arranged along the circumferential direction on the left end disk of the chuck seat, and the chuck seat and the connecting shaft are formed with screws installed in the three screw through holes and the three end face threaded holes in a one-to-one correspondence, so that an adjustable fixed connection is formed in the axial direction; the chuck seat is connected to the right end of the connecting seat in a radially adjustable manner through radial tightening screws installed in the four radial threaded holes on the connecting shaft.

[0014] Furthermore, a hexagonal outer surface for wrench clamping is provided at the right end of the collet cover.

[0015] The advantages and positive effects of the utility model are:

[0016] 1. The left end of the connecting shaft of the clamping device of the utility model adopts a tapered handle for positioning and a threaded tightening design, which is positioned and connected with the main shaft of the machine tool, and has the advantages of accurate positioning and reliable connection;

[0017] 2. The clamping part of the utility model adopts a micro elastic chuck group, which can realize the rapid self-centering clamping of tiny shaft parts and improve the clamping efficiency of parts.

[0018] 3. The utility model uses four radial screws to adjust the coaxiality of the connecting shaft and the elastic chuck assembly, which has the advantage of convenient and quick adjustment.

[0019] 4. The device can be used to complete part processing in a one-time clamping and direct clamping manner, which reduces cumulative errors and increases production efficiency, and product quality is further guaranteed.

[0020] 5. The right end of the connecting shaft of the utility model is designed with a Morse taper hole, which is compatible with clamping accessories such as a front center, thus expanding the applicability of the clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a ball shaft applicable to the utility model;

[0022] Figure 2 It is a structural diagram of the connecting shaft of the utility model;

[0023] Figure 3 It is a structural diagram of the chuck seat of the utility model;

[0024] Figure 4 It is a structural diagram of the spring chuck of the utility model;

[0025] Figure 5 It is a structural diagram of the spring chuck cover of the utility model;

[0026] Figure 6 This is the installation matching diagram of the disassembly nut and the connecting shaft of the utility model;

[0027] Figure 7 This is the installation matching diagram of the chuck seat and the connecting shaft of the utility model;

[0028] Figure 8 This is the installation matching diagram of the chuck seat, spring chuck and spring chuck cover of the utility model;

[0029] Fig. 9 It is a schematic diagram of the parts of the utility model being fixed on the clamping device. DETAILED DESCRIPTION

[0030] The structure of the utility model is further described below with reference to the accompanying drawings and through embodiments. It should be noted that the embodiments are descriptive rather than restrictive.

[0031] The design idea of ​​the utility model is: the original clamping method of clamping the tooling by the three-jaw chuck of the machine tool accessory and then fixing the part 100 by the tooling is changed to a one-time clamping and direct clamping method using this device to complete part processing, thereby reducing cumulative errors while increasing production efficiency, and product quality is further guaranteed.

[0032] See also Figure 2-Figure 9 A multifunctional fine-adjustable small parts clamping device for a CNC grinder, the invention point of which is: it includes a connecting shaft 1, an elastic chuck assembly and a disassembly nut 5.

[0033] The connecting shaft, see Figure 2The middle part of the connecting shaft adopts a tapered shank 1.2 design, which can be positioned with the tapered hole of the machine tool spindle, and the positioning is accurate and reliable. The tightening thread 1.1 at the left end can tighten and fix the device to the machine tool, and the right end disc 1.4 is provided with an inner hole 1.5 for connecting with the left end of the elastic chuck assembly. The inner hole preferably adopts a Morse taper No. 1 taper hole, which can be directly connected with a standard Morse taper No. 1 taper shank to form a self-locking. The corresponding accessories can be selected and replaced according to the use of this device. A right end thread 1.3 is provided near the right end of the connecting shaft. The right end thread is a disassembly thread. When the tapered shank and the spindle hole are self-locking, the disassembly nut matching this thread can be twisted, and the thread characteristics can be used to form a reverse thrust to remove the connecting shaft from the spindle. This design eliminates the complicated tapered shank disassembly link, greatly saves manpower, and improves work efficiency. Three end face threaded holes 1.6 are provided along the circumferential direction on the bottom surface of the inner hole, and four radial threaded holes 1.7 are evenly distributed along the circumferential direction on the side wall of the inner hole. After the bottom surface of the inner hole is axially positioned on the left end of the elastic chuck assembly, the three threaded holes on the bottom surface can be used to lock the elastic chuck assembly with the end screws 6 to control the locking degree of the three end screws. The four radial threaded holes on the circumference can be used with radial screws 7 to perform radial fine adjustment to control the coaxial accuracy.

[0034] The elastic chuck assembly comprises a chuck seat 2 , a spring chuck 3 , and a spring chuck cover 4 .

[0035] The chuck seat, see Figure 3 The left end disc 2.1 is a radial fine-tuning disc, which can form a rough positioning with the inner hole at the right end of the connecting shaft. The three axial through holes evenly distributed along the circumferential direction on the disc are screw through holes 2.2, which can be fixed to the connecting shaft by screws. The right end thread is the chuck locking thread 2.3, which cooperates with the spring chuck cover to lock the part. The right end internal chuck tapered hole 2.4 cooperates with the spring chuck. The tapered hole can be used to convert the axial pressure into radial force to complete the locking of the part.

[0036] The collet chuck, see Figure 4 The overall structure is a petal-shaped structure with cones at both ends, and the cones at both ends are set in an inverse taper. The left end cone 3.1 cooperates with the cone hole of the chuck on the chuck seat; the right end cone 3.2 is a positioning surface, which is positioned with the inner cone surface of the spring chuck cover, and the inner hole 3.3 cooperates with the part to complete the clamping and locking of the part. With this structure, the cones at both ends of the spring chuck will shrink evenly when subjected to force, which can make the right end inner chuck cone hole 2.4 on the chuck seat and the left end cone surface 3.1 of the spring chuck, and the right end cone surface 3.2 of the spring chuck and the inner right end cone surface 4.2 of the spring chuck cover perfectly contact, achieving a good clamping and matching effect, so that the chuck and the workpiece are not easy to move.

[0037] The collet cap, see Figure 5It mainly plays a locking role. The internal left end thread is a locking thread 4.1, which cooperates with the chuck locking thread on the right end of the chuck seat. The internal right end conical surface 4.2 is a limiting surface, which has a positioning and limiting effect on the spring chuck. The external right end hexagonal outer surface 4.3 can be used with a wrench to lock it.

[0038] The assembly and use method of the multifunctional fine-adjustable small parts clamping device for CNC grinding machines is as follows:

[0039] 1. Place the disassembly nut on the external thread at the right end of the connecting shaft through the thread. Figure 6 As shown;

[0040] 2. Place the chuck seat in the inner hole at the right end of the connecting shaft, and use the threaded hole on the bottom to pre-tighten the screws. Figure 7 As shown;

[0041] 3. Insert the spring chuck into the inner chuck conical hole at the right end of the chuck seat, and fix the spring chuck through the spring chuck cover and the chuck locking thread connection, and control the tightening force of the spring chuck cover to the appropriate size, such as Figure 8 As shown;

[0042] 4. Place the device in the inner tapered hole of the machine tool spindle, realize center positioning through the cooperation between the tapered handle of the connecting shaft and the inner tapered hole of the spindle, and realize axial locking of the clamping device through the tightening attachment on the spindle and the tightening thread on the left end;

[0043] 5. After the connecting shaft is fixed to the machine tool spindle, insert part 100 into the inner hole of the spring chuck so that the processed part of the part is exposed, and then tighten the spring chuck cover to clamp the part. See Fig. 9 ;

[0044] 6. Install the radial screw in the radial threaded hole on the connecting shaft, turn the radial screw to adjust the coaxiality between the chuck seat and the machine tool spindle, adjust to the appropriate position, lock the end screw, and then grind the parts. Fig. 9 .

[0045] After processing each part, loosen the spring chuck cover, remove the processed part, insert the part to be processed into the inner hole of the spring chuck, and clamp it by tightening the spring chuck cover.

[0046] After machining all parts or during the process, if the clamping device needs to be removed from the machine tool spindle, first loosen and remove the tension nut at the left end of the connecting shaft, then twist the removal nut in the opposite direction, apply the previous force to the connecting shaft, and remove the clamping device from the front end of the spindle as a whole.

[0047] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A multifunctional fine-adjustable small parts clamping device for a CNC grinding machine, characterized in that: It includes a connecting shaft and an elastic chuck assembly; The connecting shaft is provided with a tapered handle in the middle, a tightening thread is provided at the left end, and a disc-shaped right end is provided with an inner hole at the right end; the connecting shaft is positioned and matched with the tapered hole of the machine tool spindle through the tapered handle in the middle, and is tightened and fixed with the locking accessory on the machine tool spindle through the tightening thread at the left end; The elastic chuck assembly comprises a chuck seat, a spring chuck and a spring chuck cover; the left end of the chuck seat is disc-shaped, the right end is provided with a chuck locking thread on the outside, and the right end is provided with a chuck tapered hole on the inside; the spring chuck as a whole is a petal-shaped structure with reverse tapers at both ends, the tapered surface at the right end is a positioning surface, and the inner hole is a part mounting hole; the left end of the spring chuck cover is provided with a locking thread, and the right end is provided with a tapered surface for limiting the position; The chuck seat is connected to the right inner hole of the connecting shaft through the left end disc to form a fine-adjustable embedded fixed connection in the axial and radial directions; the spring chuck is inserted and matched with the chuck tapered hole on the chuck seat through its left end tapered surface, and the spring chuck cover is connected with the right end chuck locking thread on the chuck seat through the internal left end locking thread, and the internal right end tapered surface of the spring chuck cover is positioned and matched with the right end tapered surface of the spring chuck, so that the part is clamped and fixed in the inner hole of the spring chuck.

2. The multifunctional fine-adjustable small parts clamping device for CNC grinding machines according to claim 1 is characterized in that: It also includes a disassembly nut, a right-end thread is arranged on the connecting shaft near the right end, the right-end thread is a disassembly thread, and the disassembly nut is connected with the disassembly thread.

3. The multifunctional fine-adjustable small parts clamping device for CNC grinding machines according to claim 1 is characterized in that: Three end face threaded holes are arranged along the circumferential direction on the bottom surface of the inner hole at the right end of the connecting shaft, and four radial threaded holes are evenly arranged along the circumferential direction on the side wall of the inner hole; three screw through holes are evenly arranged along the circumferential direction on the left end disk of the chuck seat, and the chuck seat and the connecting shaft are formed with adjustable fixed connection along the axial direction by screws installed in the three screw through holes and the three end face threaded holes in a one-to-one correspondence; the chuck seat is connected to the right end of the connecting seat in a radially adjustable manner by radial tightening screws installed in the four radial threaded holes on the connecting shaft.

4. The multifunctional fine-adjustable small parts clamping device for CNC grinding machines according to claim 1 is characterized in that: A hexagonal outer surface for wrench clamping is arranged at the right end of the spring chuck cover.

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