CN119368794B - A drilling device for high-precision mold processing - Google Patents

Abstract

The invention relates to the technical field of drilling equipment, in particular to drilling equipment for high-precision die processing, which comprises a drilling machine and a protective cover assembled at the main shaft end of the drilling machine, wherein the protective cover comprises a flange cylinder fixed on a main shaft box of the drilling machine, a hanging disc is vertically hung on the flange cylinder, a cylinder cover is detachably arranged at the bottom end of the hanging disc, the cylinder cover and a main shaft of the drilling machine are coaxially arranged, the main shaft is positioned in the cylinder cover, and a collecting bin is detachably arranged at the lower end of the cylinder cover.

Description

Drilling equipment for high-precision die machining

Technical Field

The invention relates to the technical field of drilling equipment, and particularly provides drilling equipment for high-precision die machining.

Background

In the processing and manufacturing process of the die, in order to form structural holes such as fixed holes, clearance holes, top pinholes and the like, drilling processing is an indispensable processing step, and in the prior art, no corresponding protection structure is basically arranged at the drill bit end no matter semi-automatic drilling equipment or full-automatic drilling equipment is arranged, so that the following problems exist in the actual drilling processing process.

1) In the drilling process, cutting fluid and metal fragments (scrap iron) generated when a cutter rotating at a high speed contacts with a workpiece splash to the periphery, and when an operator operates at a close distance, the risk of injury to eyes, skin and other parts of the operator exists.

2) The random splashing and diffusion of the cutting fluid and the scrap iron not only affects the cleanliness of a workshop and reduces the comfort of the workshop environment and the health of personnel, but also can damage surrounding mechanical equipment or electrical systems, and the probability of equipment failure is increased.

3) The cutting fluid and the scrap iron are randomly splashed, so that the cutting fluid and scrap iron waste are not convenient to recycle, and the waste and loss of the cutting fluid are increased.

In summary, it is of positive practical significance to perform the necessary protection during the drilling process of the die.

Disclosure of Invention

In order to solve the above problems, the present invention provides a drilling apparatus for high-precision mold processing for solving the problems mentioned in the background art.

The drilling equipment for high-precision die machining comprises a drilling machine and a protective cover assembled at the main shaft end of the drilling machine, wherein the protective cover comprises a flange cylinder fixed on a main shaft box of the drilling machine, a hanging disc is vertically hung on the flange cylinder, a cylindrical cover is detachably arranged at the bottom end of the hanging disc, the cylindrical cover and the main shaft of the drilling machine are coaxially arranged, the main shaft is positioned in the cylindrical cover, and a collecting bin is detachably arranged at the lower end of the cylindrical cover.

The collecting bin comprises an outer cylinder and an inner cylinder, wherein the outer cylinder is detachably and butt-jointed to the lower end of the cylinder cover, the inner cylinder is coaxially arranged in the outer cylinder, an annular groove is formed between the bottom ends of the outer cylinder and the bottom end of the inner cylinder in a sealing mode, a plurality of magnet sheets distributed around the circumference of the inner cylinder are fixed at the top end of the inner cylinder, and a horn mouth with gradually increased radius from bottom to top is formed by the plurality of magnet sheets in a surrounding mode.

The bottom end of the flange cylinder is rotatably provided with a cleaning rotary drum which rotates around a main shaft of the drilling machine, the cleaning rotary drum vertically penetrates through the hanging disc and extends into the cylinder cover, the cleaning rotary drum comprises a plurality of cleaning brushes which are distributed around the circumference of the main shaft, the cleaning brushes are located in a bell mouth space surrounded by the magnet sheets, and a linkage component for realizing linkage between the collection bin and the cleaning rotary drum is arranged at the bottom end of the hanging disc.

When the collecting bin, the cylinder cover and the hanging disc rise synchronously, the magnet pieces are in contact with the cleaning brush, and the collecting bin drives the cleaning rotary drum to rotate through the linkage part, so that the cleaning brush brushes the magnet pieces in a rotating mode.

Preferably, the cleaning rotary drum further comprises a rotary drum vertically penetrating through the hanging disc, the rotary drum is rotatably installed at the bottom end of the flange drum, the flange disc is fixed at the bottom end of the rotary drum, and the cleaning brushes are jointly fixed at the bottom end of the flange disc.

Preferably, the hanging disc package is provided with a plurality of limit guide rods vertically and slidably arranged on the flange cylinder, a circular disc is horizontally fixed between the bottom ends of the limit guide rods, the circular disc is sleeved on the rotary cylinder in a sliding manner, and the collecting bin is detachably arranged on the circular disc.

Preferably, the linkage part comprises a rack guide block fixed on the lower end surface of the circular disc, a rack is horizontally and slidably arranged on the rack guide block, a gear ring meshed with the rack is arranged on the flange plate, a guide pillar is vertically fixed on the lower end surface of the circular disc, a sliding tube is slidably arranged on the guide pillar in a matched manner, a reset spring is sleeved on the guide pillar, two ends of the reset spring are respectively fixed on the lower end surface of the circular disc and the top end of the sliding tube, a connecting rod is hinged on the sliding tube, the other end of the connecting rod is hinged on the rack, and a top contact ring contacted with the bottom end of the sliding tube is arranged on the top end of the outer cylinder.

Preferably, a nozzle for spraying the cutting fluid is horizontally and fixedly penetrated between the outer cylinder and the inner cylinder, and a nozzle end of the nozzle is positioned in the inner cylinder.

Preferably, the lower end face of the circular ring disc is provided with an embedded ring, the cylinder cover is sleeved on the embedded ring, and a plurality of positioning assemblies matched with the embedded ring for positioning are circumferentially distributed on the cylinder cover.

Preferably, the positioning assembly comprises a positioning pin which is radially and slidably installed on the cylinder cover in a penetrating manner, a tension spring is sleeved on the positioning pin, two ends of the tension spring are respectively fixed on the outer side wall of the cylinder cover and the positioning pin, and a positioning hole for inserting the positioning pin is formed in the embedded ring.

Preferably, a plurality of heat dissipation holes are distributed on the circumference of the circular disc.

Preferably, the outer cylinder is provided with a liquid outlet, and the liquid outlet is arranged close to the bottom end of the outer cylinder.

Preferably, the cylinder cover and the collecting bin are made of transparent plastic materials.

The drilling equipment for high-precision die processing has the advantages that on the basis of an existing drilling machine, the protective cover is arranged at the drill bit end in a matched manner, so that a relatively closed environment can be formed together with die materials in the drilling process, the drill bit is protected and isolated, the influence of splashed cutting fluid and scrap iron on the safety and health of operators in the drilling process is avoided, the damage to the cleanliness of the workshop environment is reduced, and the comfort of the working environment is improved; in addition, the annular groove is arranged in the protective cover, so that part of splashed cutting fluid and scrap iron can be collected in real time, the collected cutting fluid can be guided out in time, the collection and capture of the scrap iron are enhanced in a magnetic attraction mode, and the magnetically attracted and adsorbed scrap iron is further cleaned in the descending carry and ascending and retreating processes during drilling.

Drawings

The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout the several views, and are not intended to scale, emphasis instead being placed upon illustrating the principles of the invention.

Fig. 1 is a schematic perspective view of a drilling apparatus for high-precision mold processing according to the present invention.

Fig. 2 is a front view of a drilling apparatus for high-precision mold processing according to the present invention.

Fig. 3 is a cross-sectional view of A-A in fig. 2.

Fig. 4 is a plan sectional view of a drilling apparatus for high-precision mold processing provided by the present invention.

Fig. 5 is a perspective cross-sectional view of the shield.

Fig. 6 is a perspective view of the assembly of the cleaning bowl with the flange bowl.

Fig. 7 is a perspective view of the suspension pan and linkage assembly.

Fig. 8 is a perspective view of the collection bin.

In the figure, 1, a drilling machine; 11, a headstock, 12, a main shaft, 13, a drill bit, 2, a flange cylinder, 3, a hanging disc, 31, a limit guide rod, 32, a circular disc, 321, a heat dissipation hole, 322, an embedded ring, 323, a locating hole, 4, a cylinder cover, 41, a locating component, 411, a locating pin, 412, a tension spring, 5, a collecting bin, 51, an outer cylinder, 511, a contact ring, 512, a liquid outlet, 52, an inner cylinder, 53, a magnet sheet, 54, a spray pipe, 6, a cleaning rotary drum, 61, a rotary drum, 62, a flange disc, 621, a gear ring, 63, a cleaning brush, 631, nylon brush hair, 7, a linkage part, 71, a rack guide block, 72, a rack, 73, a guide pillar, 74, a sliding tube, 75, a return spring, 76 and a connecting rod.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In order that those skilled in the art will better understand the present invention, the following description will be given in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, 3 and 4, the drilling device for high-precision die machining comprises a drilling machine 1 and a protective cover assembled on a spindle end, wherein the drilling machine 1 is any type or form of existing device for die drilling, and it is noted that only the spindle end of the drilling machine 1 is shown in the drawings, the spindle end comprises a spindle box 11, a spindle 12 is assembled on the spindle box 11, and a drill bit 13 is fixed on the spindle 12 through a spindle chuck.

In this embodiment, as shown in fig. 2,3,4, 5 and 7, the part of the bottom end of the spindle box 11 extending out of the spindle 12 is in a cylindrical structure, the protection cover comprises a flange cylinder 2 fixed on the cylindrical structure of the spindle box 11 of the drilling machine 1 through screws, a hanging disc 3 is vertically hung on the flange cylinder 2, the hanging disc 3 comprises four limit guide rods 31 vertically and slidably arranged on the flange cylinder 2, the four limit guide rods 31 are uniformly distributed around the circumference of the flange cylinder 2, protruding steps are arranged at the top ends of the limit guide rods 31, the limit guide rods 31 are lapped on the flange cylinder 2 through the step parts, a circular ring disc 32 is horizontally fixed between the bottom ends of the four limit guide rods 31 through screws, an embedded ring 322 is arranged on the lower end face of the circular ring disc 32, the embedded ring 322 is integrally formed on the circular ring disc 32, a cylinder cover 4 is detachably arranged on the embedded ring 322, the cylinder cover 4 is coaxially arranged with the spindle 12 of the drilling machine 1, the spindle 12 is located in the cylinder cover 4, a collecting bin 5 is detachably arranged at the lower end of the cylinder cover 4, and a drill bit 13 is located in the cylinder cover 4 and a transparent bin 5 is manufactured in order to ensure that the drill bits 4 can be made of a transparent material, for example, and the drill bit is made of the transparent glass, and the transparent glass is in the drilling bin 4 is manufactured. In addition, since a large amount of heat is generated during drilling, a plurality of heat dissipation holes 321 are uniformly formed in the circumference of the annular disk 32 for facilitating heat dissipation. In order to realize quick assembly and disassembly of the cylinder cover 4, two positioning assemblies 41 which are matched with the embedded ring 322 for positioning are circumferentially distributed on the cylinder cover 4, the positioning assemblies 41 comprise positioning pins 411 which are radially and slidably installed on the cylinder cover 4 in a penetrating manner, tension springs 412 are sleeved on the positioning pins 411, two ends of each tension spring 412 are respectively fixed on the outer side wall of the cylinder cover 4 and the positioning pins 411, the positioning pins 411 can be made of stainless steel materials, one end of each tension spring 412 can be directly welded on each positioning pin 411, the other end of each tension spring 412 can be welded on an iron sheet, the iron sheet is fixed on the outer side wall of the cylinder cover 4 through screws, and positioning holes 323 for inserting the positioning pins 411 are formed in the embedded ring 322.

As shown in fig. 3,4, 5 and 8, the collecting bin 5 comprises an outer cylinder 51 which is mounted in the cylinder cover 4 in a threaded fit manner and an inner cylinder 52 which is coaxially arranged in the outer cylinder 51, and annular grooves are formed between the bottom ends of the outer cylinder 51 and the inner cylinder 52 in a closed manner, and serve as collecting grooves for collecting cutting fluid and scrap iron splashed during drilling. In order to timely guide out the cutting fluid collected in the annular groove, the outer cylinder 51 is provided with a fluid outlet 512, the fluid outlet 512 is arranged near the bottom end of the outer cylinder 51, the fluid outlet 512 is connected with a hose, the other end of the hose is connected to a cutting fluid recovery system, and in addition, a filter screen can be arranged at the end, connected with the fluid outlet 512, of the hose for filtering scrap iron. The top end of the inner cylinder 52 is glued and fixed with a plurality of magnet pieces 53 distributed around the circumference of the center thereof, the magnet pieces 53 have magnetism for magnetically attracting and capturing splashed scrap iron, and avoiding the scrap iron from falling directly into the cylinder of the inner cylinder 52, so as to facilitate capturing the scrap iron and guiding the scrap iron to finally fall into the annular groove, and therefore, the plurality of magnet pieces 53 enclose a bell mouth with gradually increased radius from bottom to top.

As shown in fig. 3, 5 and 8, in the present invention, a nozzle 54 for cutting fluid injection is butted against the collecting bin 5, the nozzle 54 is horizontally penetrated between the outer cylinder 51 and the inner cylinder 52, and the nozzle end of the nozzle 54 is located in the inner cylinder 52, in this embodiment, the nozzle 54 is divided into two parts of a straight pipe section horizontally penetrating the outer cylinder 51 and the inner cylinder 52 and an elbow nozzle extending into the inner cylinder 52 and butted against the straight pipe section when assembled, and the outer end of the nozzle 54 is butted against the existing cutting fluid delivery system by a hose.

In order to enable the scrap iron adsorbed on the magnet piece 53 to fall further towards the annular groove, as shown in fig. 3,4, 5 and 6, the bottom end of the flange barrel 2 is provided with a cleaning rotary drum 6 rotating around the main shaft 12 of the drilling machine 1, the cleaning rotary drum 6 comprises a rotary drum 61 sleeved on the cylindrical structure of the main shaft box 11, the rotary drum 61 is rotatably arranged at the bottom end of the flange barrel 2, the rotary drum 61 vertically penetrates through the annular disc 32 and is in sliding fit with the rotary drum 61, the annular disc 32 is integrally formed with the flange plate 62 at the bottom end of the rotary drum 61, a plurality of cleaning brushes 63 uniformly distributed around the circumference of the flange plate 62 are glued and fixed at the bottom end of the flange plate 62, the cleaning brushes 63 are located in a bell mouth space surrounded by the magnet pieces 53, the brush layer of the cleaning brushes 63 is nylon bristles 631, the included angle of the whole nylon bristles 631 relative to the main shaft 12 is the same as that of the magnet piece 53 relative to the main shaft 12, and the bottom end of the hanging disc 3 is provided with a linkage part 7 for realizing both the collection bin 5 and the rotary drum 6.

As shown in fig. 3, 4 and 7, the linkage part 7 comprises a rack guide block 71 fixed on the lower end surface of the circular disc 32 through a screw, the rack guide block 71 is horizontally and slidably provided with a rack 72, a gear ring 621 meshed with the rack 72 is integrally formed on the flange 62, a guide post 73 is vertically fixed on the lower end surface of the circular disc 32 through the screw, a sliding tube 74 is slidably mounted on the guide post 73, a return spring 75 is sleeved on the guide post 73, two ends of the return spring 75 are respectively fixed on the lower end surface of the circular disc 32 and the top end of the sliding tube 74, and the circular disc 32 is made of plastic, so that the mounting and fixing mode of the return spring 75 and a tension spring 412 is the same, and is not repeated, a connecting rod 76 is hinged on the sliding tube 74, the other end of the connecting rod 76 is hinged on the rack 72, and a top contact ring 511 contacted with the bottom end of the sliding tube 74 is integrally formed on the top end of the outer cylinder 51.

In the invention, the protective cover adopts a multistage detachable structure, when the drill bit 13 needs to be replaced or installed, the two positioning pins 411 can be pulled out from the positioning holes 323, so that the cylindrical cover 4 and the collecting bin 5 are integrally dismounted, the drill bit 13 can be installed, and in the continuous drilling process, when more scrap iron is accumulated in the annular groove of the collecting bin 5, the collecting bin 5 can be rotationally unscrewed from the cylindrical cover 4, and then the collecting bin 5 can be inverted to realize dumping cleaning of the scrap iron.

In the actual drilling process, the bottom end of the collecting bin 5 needs to naturally contact with the die material, so as to ensure that the bottom end of the collecting bin 5 can keep fit with the die material to maintain a relatively closed state, therefore, the protective cover disclosed by the invention is mainly used for drilling a large plane die plate such as an upper die plate and a lower die plate, and the actual drilling is as follows.

During drilling, the drilling machine 1 drives the drill bit 13 to move to a position right above a preset drilling position of the die plate, then the protective cover and the drill bit 13 descend synchronously, in the descending process, the bottom end of the collecting bin 5 is firstly contacted with the die plate surface, under the matched guide of the limiting guide rod 31 and the flange cylinder 2, the collecting bin 5 and the cylinder cover 4 and the circular ring disc 32 are passively and integrally lifted, the drill bit 13 extends downwards relative to the inner cylinder 52, and along with the descending, the drilling is completed, during the drilling, cutting fluid and scrap iron generated by the drilling can splash, part of the splashed cutting fluid passes through a gap between the magnet pieces 53 and directly falls into the annular groove, and part of the splashed scrap iron is absorbed on the magnet pieces 53 (part of the scrap iron passes through the gap between the magnet pieces 53 and enters the annular groove) under the sound absorption of magnetic force, the bottom end of the collecting bin 5 is propped against the die plate, the protective cover forms a relatively closed drilling space for the drill bit 13, the splashed cutting fluid and the scrap iron can be effectively collected, the splashed cutting fluid and the scrap iron can be prevented from being safely operated by people and the influence of surrounding workshop environment, and the splashed cutting fluid and the scrap iron can be prevented from falling into the die plate 52; when the collection bin 5 is passively lifted, the magnet piece 53 gradually contacts with the nylon bristles 631 of the cleaning brush 63, the cleaning rotary drum 6 is synchronously lifted along with the drill bit 13, so that the top contact ring 511 pushes the sliding tube 74 upwards, the return spring 75 is gradually compressed, the connecting rod 76 drives the rack 72 to slide along the rack guide block 71 and drives the gear ring 621 to integrally rotate the cleaning rotary drum 6, thereby rotating the magnet piece 53 while the nylon bristles 631 are kept in contact with the magnet piece 53, so that the peeled scrap iron can fall into the annular groove.

When the drill 13 is drilled and gradually ascended, the collecting bin 5 is firstly kept to be lapped on the die plate, the cleaning rotary drum 6 is synchronously ascended along with the drill 13, the reset spring 75 is gradually released, the sliding tube 74 pulls the rack 72 to slide through the connecting rod 76, then the cleaning rotary drum 6 is reversely rotated, and the cleaning brush 63 has a further rotary cleaning function on the magnet piece 53.

After drilling for a while, the collecting bin 5 can be detached and the scrap iron can be dumped and cleaned.

In summary, the invention provides the drilling equipment for high-precision die processing, which is provided with the protective cover at the end of the drill bit 13 on the basis of the existing drilling machine 1, and can form a relatively closed environment together with die materials in the drilling process, so that the drill bit 13 is protected and isolated, the influence of splashed cutting fluid and scrap iron in the drilling process on the safety and health of operators is avoided, the damage to the cleanliness of workshop environment is reduced, the comfort of the working environment is improved, in addition, the annular groove is arranged in the protective cover, the part of splashed cutting fluid and scrap iron can be collected in real time, the collected cutting fluid can be timely led out, the collection and capture of the scrap iron are enhanced in a magnetic attraction mode, and the scrap iron adsorbed by the magnetic attraction is further cleaned in the descending and ascending processes of the drilling, in addition, the protective cover is arranged on the basis of meeting the drilling isolation and protection, the safety of the operators is protected, and the quality of the working environment is improved.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the precise embodiments described above, and that various other devices and structures not described in detail may be affected by one of ordinary skill in the art without departing from the scope of the invention, and that various changes and modifications may be effected therein by one of ordinary skill in the art or by other equivalent embodiments without departing from the scope of the invention as defined in the appended claims. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims (7)

1. The drilling equipment for high-precision die machining comprises a drilling machine (1) and a protective cover assembled at the main shaft end of the drilling machine (1), and is characterized by comprising a flange cylinder (2) fixed on a main shaft box (11) of the drilling machine (1), a hanging disc (3) is vertically hung on the flange cylinder (2), a cylindrical cover (4) is detachably arranged at the bottom end of the hanging disc (3), the cylindrical cover (4) and a main shaft (12) of the drilling machine (1) are coaxially arranged, the main shaft (12) is positioned in the cylindrical cover (4), and a collecting bin (5) is detachably arranged at the lower end of the cylindrical cover (4), wherein:

The collecting bin (5) comprises an outer cylinder (51) which is detachably and butt-jointed and installed at the lower end of the cylinder cover (4) and an inner cylinder (52) which is coaxially arranged in the outer cylinder (51), wherein an annular groove is formed by sealing the bottom ends of the outer cylinder (51) and the bottom end of the inner cylinder (52), a plurality of magnet sheets (53) which are distributed around the circumference of the central axis are fixed at the top end of the inner cylinder (52), and a plurality of magnet sheets (53) are surrounded to form a bell mouth with gradually increased radius from bottom to top;

The bottom end of the flange cylinder (2) is rotatably provided with a cleaning rotary cylinder (6) which rotates around a main shaft (12) of the drilling machine (1), the cleaning rotary cylinder (6) vertically penetrates through the hanging disc (3) and extends into the cylinder cover (4), the cleaning rotary cylinder (6) comprises a plurality of cleaning brushes (63) which are distributed around the circumference of the main shaft (12), and the cleaning brushes (63) are positioned in a bell mouth space surrounded by the magnet sheets (53);

when the collecting bin (5) rises together with the cylinder cover (4) and the hanging disc (3) synchronously, the magnet piece (53) is in contact with the cleaning brush (63), and the collecting bin (5) drives the cleaning rotary drum (6) to rotate through the linkage part (7), so that the cleaning brush (63) brushes the magnet piece (53) in a rotating mode;

The cleaning rotary drum (6) further comprises a rotary drum (61) vertically penetrating through the hanging disc (3), the rotary drum (61) is rotatably arranged at the bottom end of the flange drum (2), a flange disc (62) is fixed at the bottom end of the rotary drum (61), and a plurality of cleaning brushes (63) are jointly fixed at the bottom end of the flange disc (62);

The hanging disc (3) comprises a plurality of limit guide rods (31) which are vertically and slidably arranged on the flange cylinder (2), a circular disc (32) is horizontally fixed between the bottom ends of the limit guide rods (31), and the circular disc (32) is sleeved and slidably arranged on the rotary drum (61);

The linkage part (7) comprises a rack guide block (71) fixed on the lower end face of the circular disc (32), a rack (72) is horizontally and slidably arranged on the rack guide block (71), a gear ring (621) meshed with the rack (72) is arranged on the flange (62), a guide post (73) is vertically fixed on the lower end face of the circular disc (32), a sliding tube (74) is slidably arranged on the guide post (73), a return spring (75) is sleeved on the guide post (73), two ends of the return spring (75) are respectively fixed on the lower end face of the circular disc (32) and the top end of the sliding tube (74), a connecting rod (76) is hinged on the sliding tube (74), the other end of the connecting rod (76) is hinged on the rack (72), and a top contact ring (511) contacted with the bottom end of the sliding tube (74) is arranged on the top end of the outer cylinder (51).

2. A drilling apparatus for high-precision die machining according to claim 1, wherein a nozzle (54) for jetting a cutting fluid is horizontally penetrated and fixed between the outer cylinder (51) and the inner cylinder (52), and a nozzle end of the nozzle (54) is located in the inner cylinder (52).

3. The drilling equipment for high-precision die machining according to claim 1, wherein an embedded ring (322) is arranged on the lower end face of the annular disc (32), the cylindrical cover (4) is sleeved on the embedded ring (322), and a plurality of positioning assemblies (41) matched with the embedded ring (322) are circumferentially distributed on the cylindrical cover (4).

4. The drilling equipment for high-precision die machining according to claim 3, wherein the positioning assembly (41) comprises a positioning pin (411) penetrating through the cylinder cover (4) in the radial direction and slidably installed, a tension spring (412) is sleeved on the positioning pin (411), two ends of the tension spring (412) are respectively fixed on the outer side wall of the cylinder cover (4) and the positioning pin (411), and a positioning hole (323) for inserting the positioning pin (411) is formed in the embedded ring (322).

5. The drilling equipment for high-precision die machining according to claim 1, wherein a plurality of heat dissipation holes (321) are circumferentially distributed on the annular disc (32).

6. The drilling equipment for high-precision die machining according to claim 1, wherein the outer cylinder (51) is provided with a liquid outlet (512), and the liquid outlet (512) is arranged close to the bottom end of the outer cylinder (51).

7. The drilling equipment for high-precision die machining according to claim 1, wherein the cylinder cover (4) and the collecting bin (5) are made of transparent plastic materials.