A compact self-clamping biasing spindle hole making device and hole making method

Abstract

The application belongs to the field of processing equipment, and discloses a compact self-clamping bias spindle hole making equipment and a hole making method. The compact self-clamping bias spindle hole making equipment comprises a bias holding module, a bias spindle guiding module and a feeding drill body. The bias holding module comprises a thin air cylinder driven six-link mechanism with a dead point structure, which realizes clamping force increase when pushed to the dead point, and cooperates with a rubber head to flexibly fix a workpiece; the bias spindle guiding module realizes spindle biasing through a multi-stage gear set, and combines a Teflon positioning ring, an angular contact bearing and a deep groove ball bearing to improve the rigidity and stability of the spindle. The equipment is compact in structure, can adapt to extremely narrow space hole making, and solves the problems of low hole making precision and poor efficiency in the field of aerospace.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of processing equipment, in particular to a compact self-clamping biased spindle hole making equipment and a hole making method. BACKGROUND

[0002] The connection of aerospace high-end equipment is mainly by screwing and riveting, which requires the processing of tens of thousands of connecting holes. In order to avoid hole position deviation and other problems, integrated hole making needs to be implemented on multiple connecting pieces at the assembly station. However, the longitudinal and transverse staggered partitions and ribs in the assembly station form a large number of extremely narrow semi-closed machining spaces and local narrow structures, which not only restricts the operation of workers and makes it difficult to apply auxiliary tooling, but also poses a great challenge to automatic hole making. Restricted by space conditions, the machining of such holes can only rely on manual operation of angle heads or bent air drills. This processing method not only has low efficiency, but also cannot effectively support the bending moment borne by the processing process, resulting in poor processing stability, and it is difficult to guarantee the hole diameter precision, position degree and perpendicularity, which seriously restricts the development process and batch production capacity of aerospace high-end equipment.

[0003] In view of the above problems, various hole making equipment has been developed by domestic and foreign research institutions. For example, the automatic feed drill invented by Desoutter Company of France uses a bias module to offset the spindle to insert the tool into a small space and fix it on the drill template for processing, but due to the existence of the bayonet structure, its axial length cannot meet the requirements of hole making in extremely narrow space. In China, Qingdao Front Guard Pneumatic Tool Manufacturing Technology Co., Ltd. invented a “rotary type bias head automatic feed drilling device” (patent number: CN201920069233.5), which connects the feed mechanism with the bias head through the engine and a first and second reducer to realize automatic drilling in narrow space, but it lacks an effective workpiece clamping mechanism, and the workpiece is prone to deformation during processing; Dalian Zixi Technology Engineering Co., Ltd. invented a “narrow space hole making device” (patent number: CN202110950343.4), which clamps the workpiece through the clamping base and clamping block, and uses a gear and rack to achieve feeding, but the clamping mechanism needs to be tightened manually, which is difficult for workers to operate in some narrow spaces and the tightening force cannot be accurately controlled; Hangzhou Navigation Instrument Co., Ltd. invented a “drilling equipment for narrow space” (patent number: CN202310397833.5), which uses a three-axis moving device at the bottom of the mounting block to achieve high flexibility control for hole making in narrow space, but it lacks the function of spindle biasing, which cannot meet the requirements of hole making in extremely narrow space.

[0004] In summary, in order to meet the urgent need for high-quality and efficient hole making in extremely narrow space, it is urgent to develop an automatic hole making equipment that can be self-held, light and compact, to solve the key technical bottleneck in aerospace assembly. SUMMARY

[0005] The application is based on the high adaptability requirement of hole drilling in extremely narrow space, and develops a compact self-clamping bias spindle hole drilling equipment and a hole drilling method. The feed drill body provides tool feed and spindle rotation. The bias transmission module transmits the spindle rotation motion to the tool inserted into the muscle seam through a gear set, and designs a spindle guide structure to ensure high-precision linear motion of the spindle. The bias holding module uses a thin cylinder to push a connecting rod mechanism to a position near the dead point to realize high-stability automatic clamping of the workpiece. Finally, high-stability self-holding and high-precision bias automatic hole drilling of the hole drilling equipment are realized.

[0006] The technical scheme of the application is as follows:

[0007] A compact self-clamping bias spindle hole drilling equipment, comprising a bias holding module 1, a bias spindle guide module 2 and a feed drill body 3.

[0008] The bias holding module 1 comprises a thin cylinder 101, a cylinder bracket 102, a holding module shell 103, a six-link mechanism with dead point structure 104 and a clamping piece 105. The thin cylinder 101 is connected with the upper end surface of the cylinder bracket 102. The six-link mechanism with dead point structure 104 is connected with the piston shaft of the thin cylinder 101 through the connecting rod one 10401 thereon. The six-link mechanism with dead point structure 104 is connected with the holding module shell 103 through the connecting rod mounting bracket 10406 thereon. The six-link mechanism with dead point structure 104 is fixedly connected with the clamping piece 105 through the connecting rod five 10405 thereon.

[0009] The six-link mechanism with dead point structure 104 is composed of the connecting rod one 10401, the connecting rod two 10402, the connecting rod three 10403, the connecting rod four 10404, the connecting rod five 10405, the connecting rod mounting bracket 10406, a rotating pair and a moving pair. One end of the connecting rod one 10401 is connected with the piston shaft of the thin cylinder 101, and the other end thereof is connected with one end of the connecting rod two 10402 through a hinge pin to realize rotating pair connection. The other end of the connecting rod two 10402 is connected with one end of the connecting rod three 10403 and one end of the connecting rod four 10404 through a thrust needle bearing and a hinge pin to realize rotating pair connection. The other end of the connecting rod three 10403 is connected with one end of the connecting rod five 10405 through a thrust needle bearing and a hinge pin to realize rotating pair connection. The other end of the connecting rod four 10404 is connected with the connecting rod mounting bracket 10406 through a hinge pin to realize rotating pair connection. The connecting rod mounting bracket 10406 is connected with the holding module shell 103 through a bottom hole. The connecting rod five 10405 is connected with the connecting rod mounting bracket 10406 through a linear guide rail to realize moving pair connection. The clamping piece 105 comprises an end clamping piece 10501 and a rubber head 10502. The end clamping piece 10501 is fixedly connected with the other end of the connecting rod five 10405. The rubber head 10502 is fixedly connected with the other end of the end clamping piece 10501 to realize flexible contact and fixation of the workpiece to be processed.

[0010] The bias spindle guide module 2 comprises a spindle 201, a spindle guide structure 202, a deep groove ball bearing 203, a multi-stage gear set 204, a concentric guide housing 205, a spindle guide housing 206, a simply supported seat 207 and a tool 208; the spindle 201 is connected with the simply supported seat 207 in sequence through the spindle guide structure 202 and the multi-stage gear set 204; the simply supported seat 207 is matched with the concentric guide housing 205 through the deep groove ball bearing 203; the concentric guide housing 205 is connected with the cylinder support 102 and the connecting rod mounting bracket 10406 respectively, and is coaxially matched with the spindle guide housing 206; the concentric guide housing 205 is matched with the multi-stage gear set 204;

[0011] Among them, the angular contact bearing 20202 is interference fit with the concentric guide frame 20201, and the Teflon positioning ring 20203 is interference fit with the spindle guide housing 206, and the spindle guide structure 202 freely slides in the inner hole of the spindle guide housing 206;

[0012] The output end of the feed drill body 3 is connected with the spindle 201, and the rotary motion of the spindle 201 is transmitted to the tool 208 through the multi-stage gear set 204.

[0013] The driving part of the bias holding module 1 is a thin cylinder 101, and the connecting rod mechanism is a six-connecting-rod mechanism 104 with dead point structure. When the thin cylinder 101 drives the six-connecting-rod mechanism 104 with dead point structure to move to the collinear state of connecting rod three 10403 and connecting rod four 10404, the dead point structure is formed, and the bias holding module 1 is always near the dead point when it works, so that clamping force is increased.

[0014] The multi-stage gear set 204 comprises a first gear 20401, a second gear 20402, a third gear 20403, a fourth gear 20404 and a gear set housing 20405; the concentric guide housing 205 is provided with a notch, the gear set housing 20405 is installed at the notch, and rotation of the gear set housing 20405 is constrained so that it only translates in the notch; the first gear 20401 is connected with the spindle 201 by means of a key groove structure; the first gear 20401, the second gear 20402, the third gear 20403 and the fourth gear 20404 are sequentially engaged and installed on the gear set housing 20405 through bearings; the fourth gear 20404 is connected with the tool 208 through threads.

[0015] The power of the spindle 201 is transmitted to the first gear 20401 through the key groove structure of the first gear 20401; the first gear 20401, the second gear 20402, the third gear 20403 and the fourth gear 20404 are respectively engaged to transmit power and bear machining load through bearings at both ends; the fourth gear 20404 transmits power to the tool 208 through threads; and bias power transmission from the spindle 201 to the tool 208 is realized.

[0016] The main shaft guide structure 202 comprises a concentric guide frame 20201, an angular contact bearing 20202, a Teflon positioning ring 20203, a bearing inner ring isolation block 20204, a wave spring 20205, a spring pressing sheet 20206 and an outer ring positioning ring 20207; two angular contact bearings 20202 are respectively arranged in the left and right sides of the inside of the concentric guide frame 20201, and are matched with the concentric guide frame 20201 and the main shaft 201; the bearing inner ring isolation block 20204 is arranged between the two angular contact bearings 20202; the outer ring positioning ring 20207 and the wave spring 20205 are sequentially arranged outside the outer side angular contact bearing 20202; the spring pressing sheet 20206 is used for pressing the wave spring 20205, and is connected with the concentric guide frame 20201; the concentric guide frame 20201 is matched with the main shaft guide shell 206 through the Teflon positioning ring 20203.

[0017] A hole drilling method realized by a compact self-clamping bias main shaft hole drilling device comprises the following steps.

[0018] Step 1: the workpiece to be processed is placed between the rubber head 10502 and the concentric guide shell 205, and the position of the compact self-clamping bias main shaft hole drilling device is adjusted so that the cutter 208 is aligned with the center of the hole to be drilled.

[0019] Step 2: the thin air cylinder 101 is ventilated, the piston shaft of the thin air cylinder 101 drives the six-link mechanism 104 with a dead point structure to move, and the rubber head 10502 flexibly presses the workpiece to complete clamping.

[0020] Step 3: the operator controls the feed drill body 3 through a program, drives the main shaft 201 to rotate and feed, and transmits the rotation and feed to the cutter 208 through the main shaft guide structure 202 and the multi-stage gear set 204, so as to perform bias hole drilling processing.

[0021] The hole drilling method has the following beneficial effects: the multi-stage gear set is used to realize bias transmission of the main shaft, so that the cutter can smoothly explore into a semi-closed space such as an extremely narrow joint, the problem that the existing device cannot adapt to hole drilling in an extremely narrow space due to the excessively long axial length or the lack of bias function is solved, and the space adaptability is significantly improved; the six-link mechanism with a dead point structure and the thin air cylinder are used to form a bias holding module, so that automatic clamping can be realized without manual operation, the clamping force is amplified by using the lever effect near the dead point, and the clamping is stable and reliable; the angular contact bearing is used to ensure the rotation accuracy of the main shaft, the high straightness guide structure, the gap cooperation of the distal bearing and the design of the slight interference pre-pressing of the guide end are combined, so as to ensure the high-precision rotation and axial feed of the cutter during bias processing, effectively improve the hole diameter accuracy and perpendicularity, and overcome the defects of insufficient manual processing accuracy; the automatic clamping, bias transmission and high-precision feed functions are integrated in the overall equipment, and the automation of hole drilling in an extremely narrow space is realized through the bias processing method. Attached Figure Description

[0022] Figure 1 Overall view of the compact self-clamping offset spindle hole-making equipment;

[0023] Figure 2 A partial sectional view of a compact self-clamping offset spindle hole-making device;

[0024] Figure 3 A partial cross-sectional view of the offset holding module of a compact self-clamping offset spindle hole-making device;

[0025] Figure 4 Exploded view of the offset holding module for a compact self-clamping offset spindle hole-making device;

[0026] Figure 5 A partial sectional view of the bias spindle guide module of a compact self-clamping bias spindle hole-making device;

[0027] In the diagram: 1-Offset holding module, 2-Offset spindle guide module, 3-Feed drill body, 101-Thin cylinder, 102-Cylinder bracket, 103-Holding module housing, 104-Six-bar linkage mechanism with dead point structure, 105-Clamping component, 10401-Link 1, 10402-Link 2, 10403-Link 3, 10404-Link 4, 10405-Link 5, 10406-Link mounting bracket, 105-Clamping component, 10501-End clamping component, 10502-Rubber head, 201-Spindle, 202-Spindle guide structure, 20 201-Concentric guide frame, 20202-Angular contact bearing, 20203-Teflon locating ring, 20204-Bearing inner ring spacer block, 20205-Wave spring, 20206-Spring pressure plate, 20207-Outer ring locating ring, 203-Deep groove ball bearing, 204-Multi-stage gear set, 20401-First gear, 20402-Second gear, 20403-Third gear, 20404-Fourth gear, 20405-Gear set housing, 205-Concentric guide housing, 206-Spindle guide housing, 207-Simple support, 208-Cutting tool. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0029] Example 1

[0030] refer to Figures 1 to 5 A compact self-clamping offset spindle hole-making device includes an offset holding module 1, an offset spindle guide module 2, and a feed drill body 3;

[0031] The bias holding module 1 comprises a thin cylinder 101, a cylinder support 102, a holding module shell 103, a six-bar linkage with dead point structure 104 and a clamping piece 105; the thin cylinder 101 is connected with the upper end surface of the cylinder support 102; the six-bar linkage with dead point structure 104 is connected with the piston shaft on the thin cylinder 101 through the connecting rod one 10401 thereon; the six-bar linkage with dead point structure 104 is connected with the holding module shell 103 through the connecting rod mounting bracket 10406 thereon; the six-bar linkage with dead point structure 104 is fixedly connected with the clamping piece 105 through the connecting rod five 10405 thereon;

[0032] The bias spindle guide module 2 comprises a spindle 201, a spindle guide structure 202, a deep groove ball bearing 203, a multi-stage gear set 204, a concentric guide shell 205, a spindle guide shell 206, a simply supported seat 207 and a tool 208; the spindle 201 is connected with the simply supported seat 207 through the spindle guide structure 202, the multi-stage gear set 204 in sequence from one end; the simply supported seat 207 is matched with the concentric guide shell 205 through the deep groove ball bearing 203; the concentric guide shell 205 is connected with the cylinder support 102 and the connecting rod mounting bracket 10406 respectively, and is coaxially matched with the spindle guide shell 206; the concentric guide shell 205 is matched with the multi-stage gear set 204;

[0033] The output end of the feed drill body 3 is connected with the spindle 201, and the rotary motion of the spindle 201 is transmitted to the tool 208 through the multi-stage gear set 204.

[0034] Further, the six-bar linkage with dead point structure 104 is composed of the connecting rod one 10401, the connecting rod two 10402, the connecting rod three 10403, the connecting rod four 10404, the connecting rod five 10405, the connecting rod mounting bracket 10406, a rotary pair and a moving pair; one end of the connecting rod one 10401 is connected with the piston shaft of the thin cylinder 101, and the other end thereof is connected with one end of the connecting rod two 10402 through a hinge pin to realize rotary pair connection; the other end of the connecting rod two 10402 and one end of the connecting rod three 10403 and one end of the connecting rod four 10404 are all connected through a thrust needle bearing and a hinge pin to realize rotary pair connection; the other end of the connecting rod three 10403 and one end of the connecting rod five 10405 are connected through a thrust needle bearing and a hinge pin to realize rotary pair connection; the other end of the connecting rod four 10404 is connected with the connecting rod mounting bracket 10406 through a hinge pin to realize rotary pair connection; the connecting rod mounting bracket 10406 is connected with the holding module shell 103 through a bottom hole; the connecting rod five 10405 is connected with the connecting rod mounting bracket 10406 through a linear guide rail to realize moving pair connection; the clamping piece 105 comprises an end clamping piece 10501 and a rubber head 10502; the end clamping piece 10501 is fixedly connected with the other end of the connecting rod five 10405; the rubber head 10502 is fixedly connected with the other end of the end clamping piece 10501 to realize flexible contact and fix the workpiece to be processed.

[0035] Further, the driving member of the bias holding module 1 is a thin air cylinder 101, and the connecting rod mechanism is a six connecting rod mechanism 104 with dead point structure. When the thin air cylinder 101 drives the six connecting rod mechanism 104 with dead point structure to move to the collinear state of connecting rod three 10403 and connecting rod four 10404, the dead point structure is formed, and the bias holding module 1 is always near the dead point when working, so as to realize clamping force amplification.

[0036] Further, the multi-stage gear set 204 includes a first gear 20401, a second gear 20402, a third gear 20403, a fourth gear 20404, and a gear set shell 20405; a slot is opened on the concentric guide shell 205, the gear set shell 20405 is installed at the slot, and the gear set shell 20405 is constrained to rotate and only translate in the slot; the first gear 20401 is connected with the main shaft 201 through a key groove structure; the first gear 20401, the second gear 20402, the third gear 20403, and the fourth gear 20404 are sequentially meshed and installed on the gear set shell 20405 through bearings; and the fourth gear 20404 is connected with the cutter 208 through threads.

[0037] Further, the power of the main shaft 201 is transmitted to the first gear 20401 through the key groove structure of the first gear 20401; the first gear 20401, the second gear 20402, the third gear 20403, and the fourth gear 20404 are respectively meshed to transmit power and bear machining load through two end bearings; and the fourth gear 20404 transmits power to the cutter 208 through threads; thereby realizing offset power transmission from the main shaft 201 to the cutter 208.

[0038] Further, the main shaft guide structure 202 includes a concentric guide rack 20201, an angular contact bearing 20202, a Teflon positioning ring 20203, a bearing inner ring isolation block 20204, a wave spring 20205, a spring pressing piece 20206, and an outer ring positioning ring 20207; two angular contact bearings 20202 are respectively installed on the inside and the left and right sides of the concentric guide rack 20201, cooperate with the concentric guide rack 20201 and the main shaft 201, and the bearing inner ring isolation block 20204 is installed between the two angular contact bearings 20202; the outer ring positioning ring 20207 and the wave spring 20205 are sequentially installed outside the outer angular contact bearing 20202; the spring pressing piece 20206 compresses the wave spring 20205 and is connected with the concentric guide rack 20201; and the concentric guide rack 20201 cooperates with the main shaft guide shell 206 through the Teflon positioning ring 20203.

[0039] Further, the angular contact bearing 20202 cooperates with the concentric guide rack 20201, the Teflon positioning ring 20203, and the main shaft guide shell 206 in an interference fit, and the main shaft guide structure 202 freely slides in the inner hole of the main shaft guide shell 206.

[0040] A compact self-clamping biasing spindle hole making device realizes a hole making method, comprising the following steps:

[0041] Step 1, place the workpiece to be processed between the rubber head 10502 and the concentric guide shell 205, adjust the position of the compact self-clamping biasing spindle hole making device so that the cutter 208 is aligned with the center of the hole to be made;

[0042] Step 2, air the thin cylinder 101, the piston shaft of the thin cylinder 101 pushes the six-link mechanism 104 to move, the rubber head 10502 flexibly presses the workpiece, and clamping is completed;

[0043] Step 3, the operator controls the feed drill body 3 through the program, drives the spindle 201 to rotate and feed, and transmits to the cutter 208 through the spindle guide structure 202 and the multi-stage gear set 204, and performs biasing hole making processing.

Claims

1. A compact self-clamping biased spindle hole making apparatus, characterized by, The compact self-clamping biasing main shaft hole drilling device comprises a biasing holding module (1), a biasing main shaft guiding module (2) and a feeding drill body (3); The biasing holding module (1) comprises a thin air cylinder (101), an air cylinder support (102), a holding module shell (103), a six-link mechanism with dead point structure (104) and a clamping piece (105); the thin air cylinder (101) is connected with the upper end surface of the air cylinder support (102); the six-link mechanism with dead point structure (104) is connected with the piston shaft of the thin air cylinder (101) through the connecting rod one (10401) thereon; the six-link mechanism with dead point structure (104) is connected with the holding module shell (103) through the connecting rod mounting bracket (10406) thereon; the six-link mechanism with dead point structure (104) is fixedly connected with the clamping piece (105) through the connecting rod five (10405) thereon; The six-link mechanism with dead point structure (104) is composed of the connecting rod one (10401), the connecting rod two (10402), the connecting rod three (10403), the connecting rod four (10404), the connecting rod five (10405), the connecting rod mounting bracket (10406), a rotating pair and a moving pair; one end of the connecting rod one (10401) is connected with the piston shaft of the thin air cylinder (101), and the other end thereof is connected with one end of the connecting rod two (10402) through a hinge pin to realize rotating pair connection; the other end of the connecting rod two (10402) is connected with one end of the connecting rod three (10403) and one end of the connecting rod four (10404) through a thrust needle bearing and a hinge pin to realize rotating pair connection; the other end of the connecting rod three (10403) is connected with one end of the connecting rod five (10405) through a thrust needle bearing and a hinge pin to realize rotating pair connection; the other end of the connecting rod four (10404) is connected with the connecting rod mounting bracket (10406) through a hinge pin to realize rotating pair connection; the connecting rod mounting bracket (10406) is connected with the holding module shell (103) through a bottom hole; the connecting rod five (10405) is connected with the connecting rod mounting bracket (10406) through a linear guide rail to realize moving pair connection; the clamping piece (105) comprises a terminal clamping piece (10501) and a rubber head (10502); the terminal clamping piece (10501) is fixedly connected with the other end of the connecting rod five (10405); the rubber head (10502) is fixedly connected with the other end of the terminal clamping piece (10501) to realize flexible contact and fixation of a workpiece to be processed. The biasing main shaft guiding module (2) comprises a main shaft (201), a main shaft guiding structure (202), a deep groove ball bearing (203), a multi-stage gear set (204), a concentric guiding shell (205), a main shaft guiding shell (206), a simply supported seat (207) and a tool (208); the main shaft (201) is sequentially connected with the simply supported seat (207) through the main shaft guiding structure (202) and the multi-stage gear set (204); the simply supported seat (207) is matched with the concentric guiding shell (205) through the deep groove ball bearing (203); the concentric guiding shell (205) is connected with the cylinder support (102) and the connecting rod mounting rack (10406) respectively, and is coaxially matched with the main shaft guiding shell (206); the concentric guiding shell (205) is matched with the multi-stage gear set (204); The angular contact bearing (20202) and the concentric guiding rack (20201) are in interference fit, and the Teflon positioning ring (20203) and the main shaft guiding shell (206) are in interference fit, and the main shaft guiding structure (202) freely slides in the inner hole of the main shaft guiding shell (206); The output end of the feeding drill body (3) is connected with the main shaft (201), and the rotary motion of the main shaft (201) is transmitted to the tool (208) through the multi-stage gear set (204).

2. The compact self-clamping biased spindle hole making apparatus of claim 1, wherein, The driving member of the biasing holding module (1) is a thin cylinder (101), and the connecting rod mechanism is a six-connecting-rod mechanism (104) with a dead point structure; when the thin cylinder (101) drives the six-connecting-rod mechanism (104) with a dead point structure to move to the collinear state of the connecting rod three (10403) and the connecting rod four (10404), a dead point structure is formed, and the biasing holding module (1) is always near the dead point during operation, thereby realizing clamping force amplification.

3. The compact self-clamping biased spindle hole making apparatus of claim 1, wherein, The multi-stage gear set (204) comprises a first gear (20401), a second gear (20402), a third gear (20403), a fourth gear (20404) and a gear set shell (20405); the concentric guiding shell (205) is provided with a notch, the gear set shell (20405) is installed at the notch, the gear set shell (20405) is constrained from rotating and is only allowed to translate in the notch; the first gear (20401) is connected with the main shaft (201) by means of a key groove structure; the first gear (20401), the second gear (20402), the third gear (20403) and the fourth gear (20404) are sequentially engaged and are installed on the gear set shell (20405) by means of bearings; the fourth gear (20404) is connected with the tool (208) by means of threads.

4. The compact self-clamping biased spindle hole making apparatus of claim 3, wherein, The power of the main shaft (201) is transmitted to the first gear (20401) through the key groove structure of the first gear (20401); the first gear (20401), the second gear (20402), the third gear (20403) and the fourth gear (20404) are respectively engaged to transmit power and bear machining load through bearings at both ends; the fourth gear (20404) transmits power to the tool (208) through threads; and the power transmission from the main shaft (201) to the tool (208) is realized.

5. The compact self-clamping, biased-spindle hole making apparatus of claim 1, wherein, The main shaft guide structure (202) comprises a concentric guide frame (20201), an angular contact bearing (20202), a Teflon positioning ring (20203), a bearing inner ring spacer block (20204), a wave spring (20205), a spring pressing sheet (20206) and an outer ring positioning ring (20207); two angular contact bearings (20202) are respectively arranged in the left and right sides of the inside of the concentric guide frame (20201) and cooperate with the concentric guide frame (20201) and the main shaft (201), and the bearing inner ring spacer block (20204) is arranged between the two angular contact bearings (20202); the outer ring positioning ring (20207) and the wave spring (20205) are sequentially arranged outside the outer angular contact bearing (20202); the spring pressing sheet (20206) presses the wave spring (20205) and is connected with the concentric guide frame (20201); the concentric guide frame (20201) cooperates with the main shaft guide shell (206) through the Teflon positioning ring (20203).

6. A method of hole making as realized by the compact self-clamping biased spindle hole making apparatus of claim 1, characterized by, The method comprises the following steps: Step 1, placing the workpiece to be processed between the rubber head (10502) and the concentric guide shell (205), adjusting the position of the compact self-clamping bias main shaft hole making device so that the cutter (208) is aligned with the center of the hole to be made; Step 2, air is supplied to the thin cylinder (101), the piston shaft of the thin cylinder (101) drives the six-link mechanism (104) with dead point structure to move, the rubber head (10502) flexibly presses the workpiece, and clamping is completed; Step 3, the operator controls the feed drill body (3) through the program, drives the main shaft (201) to rotate and feed, and transmits the rotation and feed to the cutter (208) through the main shaft guide structure (202) and the multi-stage gear set (204), and bias hole making processing is performed.

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