Piston double-end milling apparatus

Abstract

The application discloses a piston double-end milling device for milling the outer circumferential surface of a piston, which comprises an outer machine table, an end face milling cutter, a lower mounting base, a rotating machine table, a height extension base, a mounting table and a rotating motor, and further comprises an inner expansion structure, a height extension base, a mounting table, a rotating motor, an inner expansion structure, a multi-functional hole and an exhaust hole, the inner side of the height extension base is provided with a displacement element, the top of the displacement element penetrates the inside of the expansion base and is attached to the top of the expansion base, an adjustable exhaust structure, a rotating element arranged at the lower end of the displacement element, the top of the displacement element is provided with a switching element, the switching element is movably matched with the rotating element, the rotating element is electrically connected with the displacement element, a lower pressure applying structure, an annular positioning frame arranged at the lower end of the end face milling cutter, an outer pressure applying frame arranged at one side of the inner ring of the annular positioning frame, and the bottom of the outer pressure applying frame is attached to the mounting table, and the application can guarantee the stability of the upper end machining area and avoid the internal deformation or rough surface of the piston.

Description

TECHNICAL FIELD

[0001] The present application relates to a piston machining device, in particular to a piston double-end milling device. BACKGROUND

[0002] The piston is a reciprocating machine in the cylinder block of the automobile engine, and the whole piston can be mainly divided into three parts of the piston top, the piston head and the piston skirt, wherein the piston cooperates with the piston pin, and the main function of the piston is to bear the combustion pressure in the cylinder and transmit the force to the crankshaft through the piston pin and the connecting rod. After the piston is formed by stamping, the radial direction of the stamped piston needs to be machined, so that the piston is adapted to different machines. Since the inside of the piston needs to cooperate with the piston pin and the connecting rod, the inside of the piston is a hollow structure, and it is difficult to machine and fix the piston during the machining stage.

[0003] Since the inside of the piston is hollow, it cannot be machined by a traditional machine tool, so when machining the piston, a vertical milling method is usually used. However, the vertical milling method is not convenient when milling the lateral position, and the direction of the workpiece or the milling end needs to be adjusted. Therefore, some existing methods use a horizontal milling method, which limits the bottom of the piston and then machines the two ends of the piston to mill the outer periphery of the piston. However, when machining the two ends of the piston, a method of simultaneously fixing the bottom and the top is usually used. Although this method can fix the piston, the inside of the piston is prone to friction lines, and the outside is prone to deformation that cannot be observed by the naked eye. Although the piston seems to be machined to the appropriate size, actual application may cause local overheating or movement obstruction, and short-term stuttering may occur in high-precision working conditions.

[0004] Therefore, the present application aims to provide a piston double-end milling device that can provide elastic and multi-segment support to the piston inside, ensure the stability of the upper end machining area, avoid internal deformation or rough surface of the piston, and form a circumferential limiting action on the outside of the piston to form a centralized inward binding effect during ring milling. SUMMARY

[0005] The present application provides a piston double-end milling device that can effectively solve the above problems.

[0006] The present application is implemented as follows:

[0007] A piston double-end milling device for milling the outer circumferential surface of a piston, comprising an outer machine table, the inner side of the outer machine table is provided with two sets of multi-directionally arranged end face milling cutters, a lower mounting seat is arranged between the two sets of end face milling cutters, a rotary machine table is arranged above the lower mounting seat, the upper end of the rotary machine table is provided with a height extension seat, the top of the height extension seat is provided with a mounting table for accommodating the piston, the lower end of the height extension seat is provided with a rotating motor located in the lower mounting seat, and the device further comprises:

[0008] An internal expansion structure, comprising an expansion seat arranged on the mounting table, the inside of the expansion seat is hollow, a plurality of multifunctional holes are arranged on the side of the expansion seat, and an exhaust hole is arranged on the top of the expansion seat; the inner side of the height extension seat is provided with a displacement element, the top of the displacement element penetrates the inside of the expansion seat and is attached to the top of the expansion seat; after the piston is clamped on the expansion seat of the mounting table, the displacement element moves downward and extrudes the expansion seat, air in the expansion seat is discharged through the exhaust hole and the multifunctional holes, and the expansion seat is tightly attached to the inner side wall of the piston;

[0009] An adjustable exhaust structure, comprising a turning element arranged at the lower end of the displacement element, a switching element is arranged at the top of the displacement element, the switching element is movably connected with the turning element, and the turning element is electrically connected with the displacement element; after the displacement element descends to a preset distance, the turning element is turned to drive the displacement element to change position, so that the switching element closes the displacement element and the exhaust hole, and the multifunctional holes adsorb the inner side wall of the piston;

[0010] A lower pressure applying structure, comprising an annular positioning frame arranged at the lower end of the end face milling cutter, and an outer pressure applying frame is arranged on one side of the inner ring of the annular positioning frame; the bottom of the outer pressure applying frame is attached to the mounting table; when the piston is placed in the expansion seat of the mounting table, the outer pressure applying frame is attached to the outer wall of the piston.

[0011] As a further improvement, the expansion seat is a cylindrical structure with elasticity, and the expansion seat expands outward after being pressed.

[0012] As a further improvement, the displacement element comprises a push rod motor arranged in the height extension seat, the push rod of the push rod motor penetrates the expansion seat, a pressure plate connected with the push rod motor is arranged on the top of the expansion seat, and the pressure plate is always attached to the top surface of the expansion seat.

[0013] As a further improvement, the pressure plate is provided with a flow guide hole in communication with the exhaust hole.

[0014] As a further improvement, the flow guide hole comprises a small accommodating hole and a large accommodating hole arranged on the top of the pressure plate, the small accommodating hole and the large accommodating hole are connected through a cross passage, and the switching element is embedded in the large accommodating hole after the turning element is turned.

[0015] As a further improvement, the outer edge of the bottom surface of the pressure plate is sleeved with a sliding pad, and the top surface of the expansion seat is provided with an annular groove matched with the sliding pad.

[0016] As a further improvement, the steering member comprises a guide cylinder sleeved at the bottom of the displacement member, and the bottom of the guide cylinder is connected with a steering motor.

[0017] As a further improvement, the middle part of the pressure plate is provided with a plug-in stud, the switching member comprises a switching plate larger than the diameter of the pressure plate, the bottom of the switching plate is fixedly provided with a plug-in sleeve, and the plug-in stud rotates in the plug-in sleeve when the pressure plate is rotated by the steering member.

[0018] As a further improvement, one side of the switching plate facing the pressure plate is provided with a closed stud, and the diameter of the closed stud is the same as that of the large accommodating hole and larger than that of the small accommodating hole.

[0019] As a further improvement, the outer periphery of the switching plate is inwardly recessed to form an inwardly recessed cavity, the inwardly recessed cavity is filled with a closed gas bag, the middle part of the closed gas bag is provided with a micro motor, and the micro motor is controlled by an external wireless switch.

[0020] The beneficial effects of the present application are:

[0021] In the process of milling, due to the structural limitation of the limiting structure, friction lines are prone to appear in the interior of the piston, and deformation phenomena that are difficult to observe with the naked eye are prone to appear on the exterior of the piston, although the piston appears to be processed to a suitable size, but local overheating or activity obstruction phenomenon will occur in actual application, therefore, the present application establishes a limiting structure from the interior and the exterior of the piston through the structure of the internal expansion structure and the lower pressure applying structure, and through the internal expansion and external limiting mode, the piston is limited in a strict activity interval in the circumferential processing of the piston outer skirt, thereby ensuring that the axis of the piston is always stationary, so that the inner wall and the outer wall of the piston are not affected by the vibration of the piston itself during milling.

[0022] The existing multi-point fixing mode not only easily grinds the inner wall of the piston, but also easily causes the piston to deform due to the limiting force applied at the upper end, thereby affecting the processing precision and the quality of the piston, therefore, the present application sets the internal expansion structure, sets the expansion seat on the mounting table, and moves downwardly through the displacement member penetrating the expansion seat to extrude the gas in the expansion seat outwardly, so that the expansion seat expands outwardly and tightly adheres to the inner wall of the piston, thereby ensuring the limitation of the inner wall of the piston, and since the expansion seat itself has a certain elasticity and height, the inner wall of the piston is not affected, and the top pressure is not required, so that the precision of the piston is higher.

[0023] Because the piston is hollow cylindrical structure, the corresponding expansion seat is also cylindrical structure, and in order to let it can expand outside after being pressed, so the expansion seat is set to be elastic, and the inside is hollow, so that the gas inside can be discharged when being pressed, and provide the basis for the subsequent generation of suction cup effect.

[0024] Because the space between the piston and the expansion seat is small, any structure cannot be set, therefore, the way for driving the expansion seat is through the displacement piece, the displacement piece is set inside the height extension seat and extends through the expansion seat, so that the deformation degree of the expansion seat can be controlled through the extension and retraction of the push rod motor through the pressure plate, so as to control the pressing force between the expansion seat and the piston.

[0025] Although the deformation state of the expansion seat is controlled through the pressure plate, the gas in the expansion seat still needs to overflow, therefore, the pressure plate of the present application is provided with a flow guide hole communicated with the exhaust hole, so that the pressure plate can still affect the exhaust phenomenon when acting on the expansion seat.

[0026] The flow guide hole actually has two states, one is the normal exhaust state, and the other is the blocked state, when the normal exhaust state, the large containing hole on the flow guide hole is communicated with the exhaust hole, at this time the switching piece is located at the position of the small containing hole, when it needs to be switched to the blocked state, that is, the gas in the expansion seat can no longer be discharged through the top, then the large containing hole is closed, so that the exhaust hole cannot be communicated with the outside, and the gas in the expansion seat can only flow from the side.

[0027] Although the pressure plate tightly presses the expansion seat, it needs to change its own rotation angle when cooperating with the switching piece, therefore, the outer edge of the bottom surface of the pressure plate is sleeved with a circle of sliding pad, when the pressure plate rotates, the sliding pad cooperates with the annular groove, so as to achieve the purpose of pressing and rotating, without affecting the sealing performance of the local corner position.

[0028] Although the expansion seat can expand outward and tightly fix the bottom side of the piston, in fact, the fixing effect of the piston is limited by the tightness, therefore, the adjustable exhaust structure is set on the basis of the internal expansion structure, the orientation of the switching piece is changed by the turning piece, so that the switching piece can close the displacement piece and the exhaust hole, so that the gas cannot be discharged from the displacement piece and the exhaust hole, so that negative pressure can be generated at the position of the multifunctional hole, so that the expansion seat can tightly adsorb the inner wall of the piston, not only can produce the effect of abutting, but also can produce the effect of negative pressure adsorption, so as to ensure the fixing effect of the tooling on the piston.

[0029] The relative position between the switching piece and the pressure plate needs to be changed, therefore, the switching piece of the present application is provided with a closing column, so as to switch the position between the large accommodating hole and the small accommodating hole when switching, so as to achieve the effect of closing or opening the pressure plate, and the expansion seat can be freely switched between extrusion and suction.

[0030] When the turning piece changes its position, the position of the switching piece is actually fixed, and the reason why the switching piece can be fixed is that the outer side of the switching piece is concave inward and provided with a closing air bag, so that the closing air bag is first expanded outward and tightly attached to the inner wall of the piston before the turning piece turns, and due to the cooperation of the plug-in column head and the plug-in sleeve, the state of the switching piece is not affected during the turning of the pressure plate by the turning piece, thereby realizing the top closing effect of the expansion seat, and the closing air bag itself provides a part of the inward limiting force to the inner wall of the piston. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0032] Figure 1 is a perspective structural schematic diagram of the present application.

[0033] Figure 2 is a top view of the present application Figure 1 .

[0034] Figure 3 is a sectional view at B-B of the present application Figure 2 .

[0035] Figure 4 is a structural schematic diagram of the piston fixing tool of the present application.

[0036] Figure 5 is a top view of the present application Figure 4 .

[0037] Figure 6 is a sectional view at A-A of the present application Figure 5 .

[0038] Figure 7 is an enlarged view of the A area of the present application. Figure 6

[0039] Figure 8 is a structural schematic diagram of the guide hole of the present application.

[0040] In the drawings:​

[0041] The outer machine table 1, the end face milling cutter 2, the lower pressure applying structure 3, the annular positioning frame 301, the outer pressure applying frame 302, the lower mounting base 10, the rotating machine table 20, the height extension base 30, the mounting table 40, the rotating motor 50, the inner expansion structure 60, the expansion base 61, the multifunctional hole 62, the exhaust hole 63, the displacement member 64, the push rod motor 641, the pressure plate 642, the sliding pad 6421, the plug-in stud head 6422, the flow guide hole 643, the small containing hole 6431, the large containing hole 6432, the cross passage 6433, the adjustable exhaust structure 70, the steering member 71, the guide cylinder 711, the direction changing motor 712, the switching member 72, the switching plate 721, the plug-in sleeve 722, the closed column 723, and the closed air bag 724. DETAILED DESCRIPTION

[0042] The embodiments of the present application all belong to the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0043] In the description of the present application, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as the purpose of indicating the order, the technical solutions and advantages are more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0044] Reference Figures 1-8As shown, a piston double-end milling device for milling the outer circumferential surface of a piston, for installing a piston fixing tool, comprising an outer machine table 1, the inner side of the outer machine table 1 is provided with two sets of multidirectional end face milling cutters 2, a lower mounting seat 10 is arranged between the two sets of end face milling cutters 2, a rotating machine table 20 is arranged above the lower mounting seat 10, the upper end of the rotating machine table 20 is provided with a height extension seat 30, the top of the height extension seat 30 is provided with a mounting table 40 for accommodating the piston, the lower end of the height extension seat 30 is provided with a rotating motor 50 located in the lower mounting seat 10, further comprising: an inner inflation structure 60, comprising an inflation seat 61 arranged on the mounting table 40, the inflation seat 61 is hollow inside, a plurality of multifunctional holes 62 are laterally arranged on the inflation seat 61, an exhaust hole 63 is arranged on the top of the inflation seat 61, the inner side of the height extension seat 30 is provided with a displacement piece 64, the top of the displacement piece 64 penetrates the inside of the inflation seat 61 and is attached to the top of the inflation seat 61, after the piston is clamped in the inflation seat 61 of the mounting table 40, the displacement piece 64 moves downward and extrudes the inflation seat 61, the air in the inflation seat 61 is discharged through the exhaust hole 63 and the multifunctional hole 62, so that the inflation seat 61 is tightly attached to the inner side wall of the piston; an adjustable exhaust structure 70, comprising a steering piece 71 arranged at the lower end of the displacement piece 64, the top of the displacement piece 64 is provided with a switching piece 72, the switching piece 72 is movably connected with the steering piece 71, the steering piece 71 is electrically connected with the displacement piece 64, when the displacement piece 64 descends to a preset distance, the steering piece 71 is turned and drives the displacement piece 64 to change position, so that the switching piece 72 closes the displacement piece 64 and the exhaust hole 63, and the multifunctional hole 62 adsorbs the inner side wall of the piston; a lower pressure applying structure 3, comprising an annular positioning frame 301 arranged at the lower end of the end face milling cutter 2, the outer side of the annular positioning frame 301 is provided with an outer pressure applying frame 302, the bottom of the outer pressure applying frame 302 is attached to the mounting table 40, when the piston is placed in the inflation seat 61 of the mounting table 40, the outer pressure applying frame 302 is attached to the outer wall of the piston.

[0045] In use, the piston is moved to the top of the inflation seat 61 in the form of uplink movement by the mechanical hand, the inner wall of the piston is nested on the outside of the inflation seat 61, and the outer pressure applying frame 302 abuts against the outer side wall of the piston, then the inner inflation structure 60 and the adjustable exhaust structure 70 are driven in sequence to tightly fix the piston, and the end face milling cutter 2 is driven to mill the outer part of the piston, and the rotating machine table 20 starts to rotate.

[0046] In the process of milling, due to the structure limitation of the limiting structure, the inside of the piston is prone to friction lines, and the outside is prone to deformation phenomena that are difficult to observe with the naked eye, although the piston appears to be processed to the appropriate size, but when actually applied, local overheating or activity obstruction phenomenon will occur, therefore, the inside of the piston and the outside of the piston are established by the structure of the inside expansion structure 60 and the lower pressure structure 3, and the inside expansion and outside limiting way, the piston is limited in a strict activity interval during the circumferential processing of the piston outer skirt, thereby ensuring that the axis of the piston is always stationary, so that the inner wall and the outer wall of the piston are not affected by the vibration of the milling itself on the limiting structure.

[0047] The existing multi-point fixing method not only grinds the inner wall of the piston, but also the limiting force applied at the upper end is prone to cause deformation of the piston, thereby affecting the processing precision and the quality of the piston, therefore, the inside expansion structure 60 is arranged on the installation table 40, the expansion seat 61 is arranged, and the displacement piece 64 penetrating the expansion seat 61 is used to move downward to extrude the expansion seat 61, the gas in the expansion seat 61 is extruded outward, the expansion seat 61 is expanded outward and tightly attached to the inner wall of the piston, thereby ensuring the limitation of the inner wall of the piston, and since the expansion seat 61 itself has a certain elasticity and height, the inner wall of the piston is not affected, and the top pressure is not required, so that the precision of the piston is higher.

[0048] Since the piston is a hollow cylindrical structure, the expansion seat 61 of the present embodiment is a cylindrical structure with elasticity, the expansion seat 61 expands outward after being pressed, in order to expand outward after being pressed, the expansion seat 61 is arranged to be elastic and hollow inside, so that the gas inside can be discharged outward when pressed, providing a basis for the subsequent suction cup effect.

[0049] Since the space between the piston and the expansion seat 61 is small, any structure cannot be arranged, therefore, the displacement piece 64 is used to drive the expansion seat 61, specifically, the displacement piece 64 includes a push rod motor 641 arranged in the height extension seat 30, the push rod of the push rod motor 641 penetrates the expansion seat 61, the top of the expansion seat 61 is provided with a pressure plate 642 connected with the push rod motor 641, the pressure plate 642 is always attached to the top surface of the expansion seat 61, the displacement piece 64 is arranged inside the height extension seat 30 and extends through the expansion seat 61, so that the deformation degree of the expansion seat 61 can be controlled through the pressure plate 642 by the extension and retraction of the push rod motor 641, thereby controlling the pressing force between the expansion seat 61 and the piston.

[0050] Although the deformation state of the expansion seat 61 is controlled by the pressure plate 642, the pressure plate 642 still needs to allow the gas in the expansion seat 61 to overflow, therefore, the pressure plate 642 of the embodiment is provided with a flow guide hole 643 communicated with the exhaust hole 63, and the pressure plate 642 still does not affect the exhaust phenomenon when acting on the expansion seat 61.

[0051] The flow guide hole 643 actually has two states, specifically, one is a normal exhaust state, and the other is a blocked state, and the structure supporting the switching of the two states is specifically that the flow guide hole 643 includes a small containing hole 6431 and a large containing hole 6432 opened on the top of the pressure plate 642, the small containing hole 6431 and the large containing hole 6432 are connected through a cross passage 6433, and the switching piece 72 is embedded in the large containing hole 6432 after the turning piece 71 is turned, when the normal exhaust state, the large containing hole 6432 on the flow guide hole 643 is communicated with the exhaust hole 63, at this time the switching piece 72 is located in the position of the small containing hole 6431, and when it needs to be switched to the blocked state, that is, the gas in the expansion seat 61 can no longer be discharged from the top, the large containing hole 6432 is closed, so that the exhaust hole 63 cannot be communicated with the outside, thereby ensuring that the gas in the expansion seat 61 only flows from the lateral position.

[0052] Although the pressure plate 642 tightly presses the expansion seat 61, it needs to change its rotation angle when cooperating with the switching piece 72, therefore, the outer edge of the bottom surface of the pressure plate 642 is sleeved with a circle of sliding pads 6421, and the top surface of the expansion seat 61 is provided with an annular groove matched with the sliding pads 6421, the outer edge of the bottom surface of the pressure plate 642 is sleeved with a circle of sliding pads 6421, and when the pressure plate 642 rotates, the sliding pads 6421 cooperate with the annular groove, so as to achieve the purpose of pressing and rotating, without affecting the sealing performance of the local corner position.

[0053] Although the expansion seat 61 can expand outward and tightly fix the bottom side of the piston, in fact, the fixing effect of the piston by the tight force is limited, therefore, the adjustable exhaust structure 70 is arranged on the basis of the inner expansion structure 60, the orientation of the switching piece 72 is changed by the turning piece 71, so that the switching piece 72 can close the displacement piece 64 and the exhaust hole 63, so that the gas cannot be exhausted from the position of the displacement piece 64 and the exhaust hole 63, thereby negative pressure can be generated at the position of the multifunctional hole 62, so that the expansion seat 61 can tightly adsorb the inner wall of the piston, not only the abutting effect can be generated, but also the negative pressure adsorption effect can be generated, thereby ensuring the fixing effect of the tooling on the piston.

[0054] In order to realize the steering of the steering part 71, the steering part 71 comprises a guide cylinder 711 arranged at the bottom of the displacement part 64, and the bottom of the guide cylinder 711 is connected with a steering motor 712, which drives the guide cylinder 711 and then drives the displacement part 64 to rotate.

[0055] The relative position between the switching part 72 and the pressure plate 642 needs to be changed, and therefore, one side of the switching plate 721 of the embodiment is provided with a closed column 723, the diameter of the closed column 723 is the same as that of the large accommodating hole 6432 and is larger than that of the small accommodating hole 6431, and by arranging the closed column 723 on the switching part 72, the position between the large accommodating hole 6432 and the small accommodating hole 6431 can be switched when the switching position is switched, so as to realize the effect of closing or opening the pressure plate 642, and the expansion seat 61 can be freely switched between the extrusion and the suction.

[0056] When the steering part 71 changes its position, the position of the switching part 72 is actually fixed, and the reason why the switching part 72 can be fixed is that the outer circumferential surface of the switching plate 721 is inwardly recessed to form an inward recessed cavity, the inward recessed cavity is filled with a closed air bag 724, the closed air bag 724 is provided with a micro motor, and the micro motor is controlled by an external wireless switch, the outer side of the micro motor is inwardly recessed and provided with the closed air bag 724, so that the closed air bag 724 can be outwardly expanded and tightly attached to the inner wall of the piston before the steering part 71 is steered, and since the middle part of the pressure plate 642 is provided with a plug-in stud head 6422, the switching part 72 comprises a switching plate 721 which is larger than the diameter of the pressure plate 642, the bottom of the switching plate 721 is fixedly provided with a plug-in sleeve 722, and when the pressure plate 642 is rotated by the steering part 71, the plug-in stud head 6422 rotates in the plug-in sleeve 722, and the cooperation between the plug-in stud head 6422 and the plug-in sleeve 722 can not affect the state of the switching part 72 during the rotation of the pressure plate 642 by the steering part 71, so as to realize the top closing effect of the expansion seat 61, and the closed air bag 724 itself provides a part of inward limiting force to the inner wall of the piston.

[0057] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and for those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-end milling device for a piston, used for milling the outer peripheral surface of a piston, comprising an outer machine table (1), two groups of multi-directionally arranged end mills (2) are provided on the inner side of the outer machine table (1), a lower mounting seat (10) is provided between the two groups of end mills (2), a rotating machine table (20) is provided above the lower mounting seat (10), a height extension seat (30) is provided at the upper end of the rotating machine table (20), a mounting table (40) is provided on the top of the height extension seat (30), the mounting table (40) is used to accommodate the piston, and a rotating motor (50) located in the lower mounting seat (10) is provided at the lower end of the height extension seat (30), characterized in that: Also includes: An internal expansion structure (60) includes an expansion seat (61) disposed on a mounting platform (40), wherein the interior of the expansion seat (61) is hollow, a multifunctional hole (62) is provided on the side of the expansion seat (61), an exhaust hole (63) is provided on the top of the expansion seat (61), a displacement member (64) is provided on the inner side of the height extension seat (30), the top of the displacement member (64) passes through the interior of the expansion seat (61) and fits on the top of the expansion seat (61), and after the piston is clamped on the expansion seat (61) of the mounting platform (40), the displacement member (64) moves downward and squeezes the expansion seat (61), and the air in the expansion seat (61) is discharged through the exhaust hole (63) and the multifunctional hole (62), so that the expansion seat (61) is closely attached to the inner wall of the piston; The adjustable exhaust structure (70) includes a steering member (71) provided at the lower end of the displacement member (64), a switching member (72) is provided on the top of the displacement member (64), the switching member (72) and the steering member (71) are movably matched, and the steering member (71) is electrically connected to the displacement member (64). When the displacement member (64) descends to a preset distance, the steering member (71) turns and drives the displacement member (64) to change its position, so that the switching member (72) closes the displacement member (64) and the exhaust hole (63), allowing the multifunctional hole (62) to adsorb the inner wall of the piston; The lower pressure structure (3) comprises an annular positioning frame (301) arranged at the lower end of the end milling cutter (2), an outer pressure frame (302) is arranged on one side of the inner ring of the annular positioning frame (301), and the bottom of the outer pressure frame (302) is attached to the mounting platform (40). When the piston is placed in the expansion seat (61) of the mounting platform (40), the outer pressure frame (302) is attached to the outer wall of the piston.

2. A piston double-end milling device according to claim 1, characterized in that: The expansion seat (61) is a cylindrical structure with elasticity, and the expansion seat (61) expands outwards when pressurized.

3. The piston double-end milling equipment according to claim 1, characterized in that: The displacement member (64) includes a push rod motor (641) arranged in the height extension seat (30), a push rod of the push rod motor (641) passes through the expansion seat (61), and a pressure plate (642) connected to the push rod motor (641) is provided on the top of the expansion seat (61), and the pressure plate (642) is always in contact with the top surface of the expansion seat (61).

4. A piston double-end milling device according to claim 3, characterized in that: The pressure plate (642) is provided with a guide hole (643) communicating with the exhaust hole (63).

5. The piston double-end milling equipment according to claim 4, characterized in that: The guide hole (643) includes a small accommodating hole (6431) and a large accommodating hole (6432) opened on the top of the pressure plate (642). The small accommodating hole (6431) and the large accommodating hole (6432) are connected via a cross-section (6433). The switching member (72) is embedded in the large accommodating hole (6432) after the steering member (71) rotates.

6. The piston double-end milling equipment according to claim 4, characterized in that: The outer edge of the pressure plate (642) is sleeved with a circle of sliding pads (6421).

7. The piston double-end milling equipment according to claim 1, characterized in that: The steering member (71) includes a guide cylinder (711) disposed at the bottom of the displacement member (64), and the bottom of the guide cylinder (711) is connected to a direction-changing motor (712).

8. The piston double-end milling equipment according to claim 6, characterized in that: A plug-in column (6422) is provided in the middle of the pressure plate (642), the switching member (72) includes a switching plate (721) having a diameter larger than that of the pressure plate (642), a plug-in sleeve (722) is fixedly provided at the center of the bottom of the switching plate (721), and when the steering member (71) drives the pressure plate (642) to rotate, the plug-in column (6422) rotates in the plug-in sleeve (722), and a closed column (723) is provided on a side of the switching plate (721) facing the pressure plate (642), and the diameter of the closed column (723) is the same as that of the large accommodating hole (6432) and is larger than that of the small accommodating hole (6431).

9. The piston double-end milling equipment according to claim 8, characterized in that: The outer circumference of the switching plate (721) is recessed inward to form an inner concave cavity, and the inner concave cavity is filled with an air-blocking airbag (724). A micro motor is provided in the air-blocking airbag (724), and the micro motor is controlled by an external wireless switch.

10. The piston double-end milling equipment according to claim 1, characterized in that: An inner ring groove (401) is formed on the outer ring of the upper surface of the mounting platform (40), and the outer pressure frame (302) includes an embedding strip (3021) embedded in the inner ring groove (401). An outer pressure ring (3022) is connected above the embedding strip (3021), and the outer pressure ring (3022) is tightly attached to the outer side of the piston.

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