阅读说明：本技术 一种平双机筒的打孔方法 (Punching method of flat double machine barrels ) 是由 杨保建 于 2020-07-29 设计创作，主要内容包括：一种平双机筒的打孔方法,包括以下步骤,固定机筒胚体；钻孔机构向机筒胚体移动；钻头在机筒胚体的端面上钻孔,冷却装置冷却钻头；钻头贯穿机筒胚体；钻孔机构回退至初始位置；钻头有两个,两个钻头通过转动电机驱动,每个钻头的侧部分布有凸部,相邻两个凸部之间的钻头侧部为缺口,两个钻头为左右平列在一起且一个钻头的凸部能不接触地伸入到另一个钻头对应的缺口中,钻头的前表面上分布有钻孔刀片,当每个钻头转动时,位于任一钻头上的钻孔刀片的切屑总范围能恰与在机筒胚体上钻出的平双通孔的一个对应圆孔相匹配。本发明的优点在于：可以将机筒平双通孔的两个圆孔一次性打出,提高了机筒平双通孔的加工效率。(A punching method of a flat double machine barrel comprises the following steps of fixing a machine barrel blank; the drilling mechanism moves towards the machine barrel blank; drilling holes on the end face of the machine barrel blank by a drill bit, and cooling the drill bit by a cooling device; the drill bit penetrates through the machine barrel blank; the drilling mechanism retreats to the initial position; the drill bit has two, and two drill bits are through rotating motor drive, and the lateral part of every drill bit has the convex part, and the drill bit lateral part between two adjacent convex parts is the breach, and two drill bits are for controlling parallel and being in the same place and the convex part of a drill bit can not contact to stretch into in the breach that another drill bit corresponds, and it has the drilling blade to distribute on the front surface of drill bit, and when every drill bit rotated, the total range of the smear metal of the drilling blade that lies in on arbitrary drill bit can just be with a corresponding round hole phase-match of the flat double through-hole that drills out on the barrel embryo body. The invention has the advantages that: can once only beat out two round holes of the flat double through-hole of barrel, improved the machining efficiency in the flat double through-hole of barrel.)

1. A punching method of a flat double cylinder comprises the following steps,

firstly, clamping a machine barrel blank (4) to be punched on a positioning mechanism (5);

secondly, starting the drilling mechanism (1) and the driving mechanism (3), wherein the driving mechanism (3) drives the drilling mechanism (1) to move towards one side of the machine barrel blank body (4) along the axial direction of the machine barrel blank body (4);

thirdly, drilling holes on the end surface of the machine barrel blank body (4) by a drill bit (10) of the drilling mechanism (1), and cooling the drill bit (10) by a cooling device (2) connected with the drilling mechanism (1) while drilling the holes;

fourthly, the driving mechanism (3) drives the drill bit (10) to extend into the machine barrel blank body (4) for drilling until the drill bit (10) penetrates through the machine barrel blank body (4);

fifthly, the driving mechanism (3) drives the drilling mechanism (1) to retreat to the initial position, and the punched cylinder is taken down from the positioning mechanism (5) to complete the cylinder punching operation;

the method is characterized in that: the drill bit (10) in the drilling mechanism (1) are two, the two drill bits (10) are driven by respective transmission rods through rotating motors which synchronously rotate in different directions, convex parts are distributed on the side part of each drill bit (10), the side part of each drill bit (10) between every two adjacent convex parts is a notch (104), the two drill bits are arranged in parallel from left to right, the convex parts of one drill bit (10) can not extend into the corresponding notches (104) of the other drill bit (10), drilling blades (102) are distributed on the front surface of each drill bit (10), and when each drill bit (10) rotates, the total range of cuttings of the drilling blade (102) on any drill bit (10) can be matched with one corresponding round hole of a parallel double-through hole (41) drilled on the cylinder blank body (4) in a contact mode.

2. The punching method according to claim 1, wherein: the drill bit (10) comprises a cutter holder (101) and drilling blades (102), the rear end face of the cutter holder (101) is concentrically connected with respective transmission rods, drilling blade mounting grooves are distributed on the front end face of the cutter holder (101) at intervals, the drilling blades (102) are respectively detachably connected in the corresponding drilling blade mounting grooves, and the cutting end of any drilling blade (102) extends out of the front end face of the cutter holder (101).

3. The punching method according to claim 2, wherein: the two tool holders (101) are located on the same plane, the number of the convex parts on each tool holder (101) is the same, and the convex parts on any tool holder (101) are uniformly distributed.

4. The punching method according to claim 3, wherein: the number of the convex parts on each tool apron (101) is four, and the gaps (104) between the adjacent convex parts are arc-shaped gaps capable of keeping the strength of the convex parts.

5. The punching method according to claim 2, wherein: the drilling tool comprises a tool apron (101), and is characterized in that mounting convex parts (105) are distributed on the front end face of the tool apron (101), the drilling blade mounting groove is located on the mounting convex parts (105), and tool apron through holes (103) capable of allowing cooling liquid and cutting chips to pass through are distributed on the front end face of the tool apron on one side of the mounting convex parts (105).

6. The punching method according to any one of claims 1 to 5, wherein: the driving mechanism (3) comprises a moving part capable of moving back and forth relative to the positioning mechanism (5) and a cylinder body (31) which is arranged on the moving part and can move back and forth along with the moving part to extend into the flat double-through hole (41), a transmission rod of the drilling mechanism (1) is positioned in the cylinder body (31), one end of the transmission rod extends out of the cylinder body (31) to be connected with the drill bit (10), and the other end of the transmission rod extends out of the cylinder body (31) to be connected with the rotating motor in a transmission mode.

7. The punching method according to claim 6, wherein: drilling mechanism (1) is including driving motor (11), drive gear (12), drive shaft (13) and drill bit (10), drive shaft (13) be the transfer line, drive shaft (13) are connected in barrel (31) inner chamber through bearing (14), the one end of drive shaft (13) is connected with driving motor (11) transmission through drive gear (12), the one end of drive shaft (13) is stretched out barrel (31) inner chamber and is connected with drill bit (10) are concentric.

8. The punching method according to claim 6, wherein: the movable part comprises a movable seat (32) and a fixed seat (33), a guide rail (331) is arranged at the top of the fixed seat (33), the movable seat (32) can be arranged on the guide rail (331) in a back-and-forth movement mode relative to the guide rail (331), a driving screw rod (34) is arranged on one side of the fixed seat (33), the driving screw rod (34) is connected with a screw rod driving motor (35), the movable seat (32) is connected with the driving screw rod (34), and the driving motor (11) and the screw rod driving motor (35) are connected with a program control circuit through wires.

9. The punching method according to claim 6, wherein: the cooling device (2) is a liquid spraying pipe capable of spraying cooling liquid to the polishing head, the liquid spraying pipe is arranged in an inner cavity of the cylinder body (31), a liquid inlet of the liquid spraying pipe is communicated with a cooling liquid source, and a liquid outlet of the liquid spraying pipe extends out of the cylinder body (31) to be aligned with the polishing head (10).

10. The punching method according to claim 9, wherein: the cooling device is characterized in that a mounting cavity (311) for accommodating a driving part and a liquid outlet cavity (312) for accommodating a liquid spraying pipe are arranged in the barrel body (31), the driving part penetrates through the mounting cavity (311) to be connected with the drill bit (10), and a return cavity for returning cooling liquid after impacting a groove drilled on the barrel blank (4) by the drill bit (10) is formed between the outer wall of the driving part and the inner wall of the mounting cavity (311).

Technical Field

The invention relates to the technical field of cylinder processing, in particular to a punching method of a flat double cylinder.

Background

The existing Chinese patent application with the application number of CN201910552248.1 entitled "machine barrel drilling device" discloses a machine barrel drilling device, which comprises a drilling mechanism and a machine barrel clamping device, wherein the machine barrel clamping device is fixed on a base capable of moving left and right, the machine barrel clamping device comprises a clamping mechanism capable of clamping the front part of a machine barrel and a clamping device capable of clamping the tail part of the machine barrel and rotating the clamped machine barrel circumferentially, the clamping device is linked with an output shaft of a driving motor through a transmission mechanism, the driving motor is connected with a numerical control indexing controller through a circuit, the base is provided with a moving motor capable of driving the base to move left and right, the moving motor is also connected with the numerical control indexing controller through a circuit, a drill bit in the drilling mechanism can rotate and move left and right through the drilling motor and is positioned on the left side of the clamping mechanism, and the drill bit is opposite to the end face drilling position extending out of the clamping mechanism after being accurately positioned by. The advantages are that: the machine barrel has high positioning precision, realizes the precision machining of deep holes drilled by the machine barrel, and can change the machine barrels with different specifications and accurately adjust the machine barrels to corresponding positions. However, the cylinder drilling device cannot process two round holes simultaneously, and the processing efficiency is low, so that the drilling method using the cylinder drilling device needs to be further improved.

Disclosure of Invention

The invention aims to solve the technical problem of providing a punching method capable of processing an inner hole of a flat double-machine barrel on a machine barrel blank at one time aiming at the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the punching method of the flat double-cylinder comprises the following steps,

firstly, clamping a machine barrel blank to be punched on a positioning mechanism;

secondly, starting a drilling mechanism and a driving mechanism, wherein the driving mechanism drives the drilling mechanism to move towards one side of the machine barrel blank body along the axial direction of the machine barrel blank body;

thirdly, drilling holes on the end surface of the machine barrel blank by a drill bit of the drilling mechanism, and cooling the drill bit by a cooling device connected with the drilling mechanism while drilling the holes;

fourthly, the driving mechanism drives the drill bit to extend into the machine barrel blank body to drill the hole until the drill bit penetrates through the machine barrel blank body;

fifthly, the driving mechanism drives the drilling mechanism to retreat to an initial position, and the drilled cylinder is taken down from the positioning mechanism to complete the cylinder drilling operation;

the method is characterized in that: the drill bit among the drilling mechanism has two, two drill bits are driven through the synchronous pivoted rotation motor of incorgruous separately by the transfer line, and the lateral part of every drill bit distributes has the convex part, and the drill bit lateral part between two adjacent convex parts is the breach, and two drill bits are for controlling the parallel together and the convex part of a drill bit can not contact to stretch into the breach that another drill bit corresponds, it has the drilling blade to distribute on the front surface of drill bit, and when every drill bit rotated, the total range of the smear metal of the drilling blade that lies in on arbitrary drill bit can just with a corresponding round hole phase-match of the flat double through-hole that drills out on the barrel embryo body.

As an improvement, the drill comprises a cutter holder and drilling blades, the rear end face of the cutter holder is concentrically connected with respective transmission rods, drilling blade mounting grooves are distributed on the front end face of the cutter holder at intervals, the drilling blades are respectively detachably connected in the corresponding drilling blade mounting grooves, and the cutting end of any drilling blade extends out of the front end face of the cutter holder.

The improved structure is characterized in that the two tool holders are located on the same plane, the number of the convex parts on each tool holder is the same, and the convex parts on any tool holder are uniformly distributed.

The further improvement, the number of the convex parts on each tool apron is four, and the gaps between the adjacent convex parts are arc-shaped gaps capable of keeping the strength of the convex parts.

The drilling tool is characterized in that the drilling tool comprises a tool apron, a drilling blade mounting groove is formed in the front end face of the tool apron, and a tool apron through hole capable of passing through cooling liquid and cutting chips is formed in the front end face of the tool apron.

As an improvement, the driving mechanism comprises a moving part which can move back and forth relative to the positioning mechanism and a cylinder which is arranged on the moving part and can move back and forth along with the moving part and can extend into the flat double-through hole, a transmission rod of the drilling mechanism is positioned in the cylinder, one end of the transmission rod extends out of the cylinder and is connected with the drill bit, and the other end of the transmission rod extends out of the cylinder and is connected with the rotating motor in a transmission way.

The drilling mechanism is further improved by comprising a driving motor, a driving gear, a driving shaft and a drill bit, wherein the driving shaft is the transmission rod, the driving shaft is connected in the inner cavity of the cylinder body through a bearing, one end of the driving shaft is in transmission connection with the driving motor through the driving gear, and one end of the driving shaft extends out of the inner cavity of the cylinder body and is concentrically connected with the drill bit.

The improved structure comprises a moving part and a fixed seat, wherein the top of the fixed seat is provided with a guide rail, the moving part can be arranged on the guide rail in a back-and-forth moving mode relative to the guide rail, a driving lead screw is arranged on one side of the fixed seat and connected with a lead screw driving motor, the moving part is connected with the driving lead screw, and the driving motor and the lead screw driving motor are connected with a program control circuit through leads.

In a further improvement, the cooling device is a liquid spraying pipe capable of spraying cooling liquid to the polishing head, the liquid spraying pipe is arranged in an inner cavity of the cylinder, a liquid inlet of the liquid spraying pipe is communicated with a cooling liquid source, and a liquid outlet of the liquid spraying pipe extends out of the cylinder to be aligned with the polishing head.

The cooling device is characterized in that a mounting cavity for accommodating the driving part and a liquid outlet cavity for accommodating the liquid spraying pipe are arranged in the barrel, the driving part penetrates through the mounting cavity to be connected with the drill bit, and a backflow cavity for returning the cooling liquid to the drill bit after impacting a groove drilled on the machine barrel blank is formed between the outer wall of the driving part and the inner wall of the mounting cavity.

Compared with the prior art, the invention has the advantages that: according to the method, the two drill bits are arranged on the drilling mechanism, so that when the flat double-machine cylinder is drilled, two C-shaped round holes of the inner hole of the flat double-machine cylinder can be drilled out (drilled) at one time without drilling holes on the blank of the machine cylinder in a grading manner, and the machining efficiency of the inner hole of the flat double-machine cylinder is greatly improved; meanwhile, the positions of the two drill bits are determined during punching, and the rotating center distance of the two drill bits is set and determined before drilling, so that the punching position does not need to be corrected for the second time, the drilling precision is further improved, the quality of the punched inner hole of the flat double-machine cylinder is better, the efficiency is higher, the difficult problems that the punching of the inner hole of the flat double-machine cylinder needs to be carried out in different times and the precision is difficult to adjust at present are solved revolutionarily, and the punching level of the flat double-machine cylinder reaches a qualitative leap. The device has the advantages that the two drill bits are positioned on the same plane through ingenious innovative design, mutual non-contact rotation of the two drill bits during rotation is effectively guaranteed, the defect that the existing flat double-machine cylinder is difficult and troublesome to punch is well overcome, due to ingenious structural innovation, the device is longer in service life, higher in production safety and better in application effect due to the adoption of the method for punching.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention;

FIG. 2 is a perspective view of FIG. 1 at another angle;

FIG. 3 is a perspective view of the drilling mechanism of FIG. 1 with the drill bit not yet drilling a hole;

FIG. 4 is a perspective view of the drill of FIG. 1 after completion of the machining of the flat double through-holes and the extension of the flat double through-holes;

FIG. 5 is an exploded view of the structure of FIG. 1;

FIG. 6 is a perspective view of the movable housing of FIG. 5 with portions broken away to show the drilling mechanism;

FIG. 7 is a perspective view of FIG. 6 with the movable seat and barrel removed;

FIG. 8 is a front perspective view of the drill bit of FIG. 1;

FIG. 9 is a perspective view of one of the drill bits of FIG. 8;

FIG. 10 is a side elevational view of FIG. 1;

FIG. 11 is a cross-sectional view taken along line A-A of FIG. 10;

FIG. 12 is an enlarged view of portion I of FIG. 1;

FIG. 13 is an enlarged view of section II of FIG. 3;

FIG. 14 is an enlarged view of section III of FIG. 4;

FIG. 15 is an enlarged view of the portion IV of FIG. 11;

fig. 16 is an enlarged view of the V portion in fig. 11.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 16, the method for punching a flat twin-cylinder of the present embodiment includes the steps of,

firstly, clamping a machine barrel blank 4 to be punched on a positioning mechanism 5;

secondly, starting the drilling mechanism 1 and the driving mechanism 3, wherein the driving mechanism 3 drives the drilling mechanism 1 to move towards one side of the machine barrel blank 4 along the axial direction of the machine barrel blank 4;

thirdly, drilling holes on the end surface of the machine barrel blank 4 by the drill 10 of the drilling mechanism 1, and cooling the drill 10 by the cooling device 2 connected with the drilling mechanism 1 while drilling the holes;

fourthly, the driving mechanism 3 drives the drill 10 to extend into the machine barrel blank 4 for drilling until the drill 10 penetrates through the machine barrel blank 4;

fifthly, the driving mechanism 3 drives the drilling mechanism 1 to retreat to the initial position, and the drilled cylinder is taken down from the positioning mechanism 5 to complete the cylinder drilling operation;

the drilling mechanism 1 comprises two drill bits 10, the two drill bits 10 are driven by respective transmission rods through rotating motors which synchronously rotate in different directions, convex parts are distributed on the side part of each drill bit 10, the side part of each drill bit 10 between every two adjacent convex parts is a notch 104, the two drill bits are arranged in parallel from left to right, the convex parts of one drill bit 10 can extend into the corresponding notches 104 of the other drill bit 10 in a non-contact manner, drilling blades 102 are distributed on the front surfaces of the drill bits 10, and when each drill bit 10 rotates, the total cutting range of the drilling blades 102 on any drill bit 10 can be matched with one corresponding round hole of a flat double-pass hole 41 drilled on a barrel blank 4.

The drill 10 comprises a tool apron 101 and drilling blades 102, the rear end face of the tool apron 101 is concentrically connected with respective transmission rods, drilling blade mounting grooves are distributed on the front end face of the tool apron 101 at intervals, the drilling blades 102 are respectively detachably connected in the corresponding drilling blade mounting grooves, and the cutting end of any drilling blade 102 extends out of the front end face of the tool apron 101. The two tool holders 101 are located on the same plane, the number of the convex parts on each tool holder 101 is the same, and the convex parts on any tool holder 101 are uniformly distributed. The number of the convex parts on each tool holder 101 is four, and the gaps 104 between adjacent convex parts are arc-shaped gaps capable of maintaining the strength of the convex parts. An installation convex part 105 is distributed on the front end face of the cutter holder 101, the drilling blade installation groove is positioned on the installation convex part 105, and cutter holder through holes 103 capable of passing through cooling liquid and cutting chips are distributed on the front end face of the cutter holder on one side of the installation convex part 105. The connecting distance S1 between the centers of rotation of the two drill bits is smaller than the diameter D of the total range of chips of either drill bit and can be the same as the distance S2 between the centers of the two circular holes of the flat double through hole 41.

The driving mechanism 3 comprises a moving part which can move back and forth relative to the positioning mechanism 5 and a cylinder 31 which is arranged on the moving part and can move back and forth along with the moving part and can extend into the flat double-through hole 41, a transmission rod of the drilling mechanism 1 is positioned in the cylinder 31, one end of the transmission rod extends out of the cylinder 31 to be connected with the drill bit 10, and the other end of the transmission rod extends out of the cylinder 31 to be connected with a rotating motor in a transmission way. The drilling mechanism 1 comprises a driving motor 11, a driving gear 12, a driving shaft 13 and a drill bit 10, wherein the driving shaft 13 is a transmission rod, the driving shaft 13 is connected in the inner cavity of the cylinder 31 through a bearing 14, one end of the driving shaft 13 is in transmission connection with the driving motor 11 through the driving gear 12, and one end of the driving shaft 13 extends out of the inner cavity of the cylinder 31 to be concentrically connected with the drill bit 10. The moving part comprises a moving seat 32 and a fixed seat 33, a guide rail 331 is arranged at the top of the fixed seat 33, the moving seat 32 is arranged on the guide rail 331 in a manner of moving back and forth relative to the guide rail 331, a driving screw rod 34 is arranged on one side of the fixed seat 33, the driving screw rod 34 is connected with a screw rod driving motor 35, the moving seat 32 is connected with the driving screw rod 34, and the driving motor 11 and the screw rod driving motor 35 are both connected with a program control circuit through leads. The specific circuit structure of the program control circuit belongs to the prior art, and therefore, the detailed description is omitted.

The cooling device 2 is a liquid spraying tube capable of spraying cooling liquid to the polishing head, the liquid spraying tube is arranged in the cavity 31 of the cylinder, the liquid inlet of the liquid spraying tube is communicated with a cooling liquid source, and the liquid outlet of the liquid spraying tube extends out of the cylinder 31 to be aligned with the polishing head 10. The cylinder 31 is provided with a mounting cavity 311 for accommodating a driving part and a liquid outlet cavity 312 for accommodating a liquid spraying pipe, the driving part passes through the mounting cavity 311 and is connected with the drill 10, and a return cavity for returning the cooling liquid after impacting the drill 10 to form a groove on the cylinder blank 4 is formed between the outer wall of the driving part and the inner wall of the mounting cavity 311.

The positioning mechanism 5 comprises a front positioning seat 51 and a rear positioning seat 52, a first positioning through hole capable of penetrating through the machine barrel blank 4 is arranged on the front positioning seat 51, a first clamping mechanism is arranged on the front positioning seat 51 in front of the first positioning through hole, a second clamping mechanism is arranged on the front positioning seat 51 at the rear of the first positioning through hole, a second positioning through hole capable of penetrating through the machine barrel blank 4 is concentrically arranged on the rear positioning seat 52, a third clamping mechanism is arranged on the rear positioning seat 52 in front of the second positioning through hole, a fourth clamping mechanism is arranged on the rear positioning seat 52 at the rear of the second positioning through hole, the first clamping mechanism can adopt a positioning ring capable of extending into the machine barrel blank 4, sliding grooves are radially arranged on the positioning ring, the circumferences of the sliding grooves are distributed on the positioning ring, positioning blocks capable of radially moving along the sliding grooves are arranged in the sliding grooves, the positioning blocks can be detachably positioned at corresponding positions of the positioning ring through screws and abut against the outer wall of the machine barrel blank 4 A cylindrical blank 4. The second clamping mechanism, the third clamping mechanism and the fourth clamping mechanism adopt the same manual positioning structure and comprise a fixing ring penetrating through the machine barrel blank body 4, fixing screws are radially arranged on the fixing ring and are provided with a plurality of threads, threaded holes are distributed in the side wall of the fixing ring, the fixing screws are respectively connected in the threaded holes in a penetrating mode, and the fixing screws clamp the machine barrel blank body 4 penetrating through the fixing ring. The supporting base 6 is fixed on the guide rail 331 between the moving base 32 and the front positioning base 51, and the barrel 31 is slidably mounted on the supporting base 6.

A protective shell is arranged at the top of the movable seat 32, the driving motor 11 is connected to the top surface of the movable seat 32 on one side of the protective shell, a partition board which divides the inner cavity of the protective shell into a front cavity and a rear cavity is arranged in the middle of the protective shell, a rotary support is arranged in the front cavity, a transmission shaft can be rotatably connected to the rotary support, one end of the transmission shaft is connected with a transmission wheel, and the transmission wheel is connected with an output wheel of the driving motor 11 through a belt or a toothed belt. The other end of the transmission shaft is connected with a transmission gear, the transmission gear is meshed with the two driving gears 12, and when the driving motor 11 drives the transmission gear to rotate, the transmission gear drives the two driving gears 12 to rotate reversely at the same speed. The back cavity is the backward flow cavity that can pass through the coolant liquid, the shower stretches into in the back cavity, drive shaft 13 one end is passed the baffle and is connected with corresponding drive gear 12, the other end of drive shaft 13 passes the back cavity and stretches into in the barrel inner chamber, be provided with the bearing respectively at the both ends of barrel, the outer lane of bearing is provided with through the interval and connects on the convex part connects the barrel inner wall, drive shaft 13 passes the inner circle of bearing, coolant liquid from spray pipe spun carries the smear metal that the drill bit cutting produced and gets into in installation cavity 311 and flows back to in the back cavity from installation cavity 311. A first opening through which the belt or toothed belt can pass and a second opening through which the coolant flow can pass are provided in the side wall of the protective housing. And the cooling liquid entering the rear cavity flows out of the second opening to the collecting tank for collection. A flow guide hopper can be arranged at the second opening, and an opening at the lower end of the flow guide hopper is positioned above an opening at the top of the collecting tank.

The working principle is as follows: the machine barrel blank to be punched is installed on the positioning mechanism, the driving mechanism moves the drilling mechanism to the machine barrel blank, the drill bit rotates to mill a groove on the end face of the machine barrel blank, the drill bit moves along the axial direction of the machine barrel blank along with the movement of the driving mechanism, and finally, the flat double-through holes are milled on the machine barrel blank. When the hole is milled, cooling liquid is sprayed out of the cooling device to the drill bit, when the drill bit does not mill a groove, the cooling liquid is collected in a collecting hopper arranged below the front of the machine barrel blank, after the drill bit mills a groove on the end face of the machine barrel blank, most of the cooling liquid carries cuttings to flow back to the installation cavity, finally flows out of a second opening on one side of the moving seat, is collected in the collecting groove, and flows into the collecting hopper arranged below the front of the machine barrel blank. And when the drill bit penetrates through the machine barrel blank and extends out of the machine barrel from one end of the flat double-through hole, the cooling liquid is collected in a collecting hopper below the rear part of the machine barrel after punching. After the machining is finished, the driving mechanism drives the drill bit to retreat until the drill bit is withdrawn from the machine barrel, and the machine barrel is taken down from the positioning mechanism, so that the machining of the flat double through holes of the machine barrel is finished.