CN116460191A

CN116460191A - Cold extrusion device of master cylinder piston and control method thereof

Info

Publication number: CN116460191A
Application number: CN202310453517.5A
Authority: CN
Inventors: 李刚; 潘松辉; 潘菁; 黄卫; 潘贤钧
Original assignee: Dachang Automobile Parts Co ltd
Current assignee: Dachang Automobile Parts Co ltd
Priority date: 2023-04-21
Filing date: 2023-04-21
Publication date: 2023-07-21
Anticipated expiration: 2043-04-21
Also published as: CN116460191B

Abstract

The invention belongs to the technical field of piston manufacturing, in particular to a cold extrusion device of a master cylinder piston, which comprises a workbench, a plurality of pistons and a plurality of pistons, wherein the working platform is arranged on the workbench; the rack is arranged at one side of the workbench; an upper supporting table is arranged on the upper side of the frame; an extrusion lower die is arranged on the workbench; the extrusion driving mechanism is arranged on the upper supporting table in the direction facing the extrusion lower die; the extrusion connecting mechanism is arranged at the end part of the extrusion driving mechanism; and the extrusion upper die is arranged on one side of the extrusion connecting mechanism facing the extrusion lower die, and the extrusion lower die and the extrusion upper die are arranged oppositely.

Description

Cold extrusion device of master cylinder piston and control method thereof

Technical Field

The invention belongs to the technical field of master cylinder piston production, and particularly relates to a cold extrusion device of a master cylinder piston and a control method thereof.

Background

In the mechanical manufacture of pistons, machining is generally performed by milling, which guarantees the requirements of the part, but also has the following drawbacks: 1. the labor and time are wasted, particularly, the processing of the polygon with less strict precision requirements is low in efficiency and high in processing cost; 2. a large amount of metal is cut, and the material utilization rate is low; 3. the metal fibers are destroyed during cutting.

Besides, a cold extrusion molding method can be adopted, the efficiency of the method can be ensured, but impact can be generated between an upper extrusion die and a lower extrusion die in the cold extrusion process, and vibration is generated by the impact, so that the working performance and the service life of equipment are easy to be reduced, the damage of parts can be accelerated, and the finished product rate of part processing is easy to be influenced.

Disclosure of Invention

The invention aims to solve the technical problems, and provides a cold extrusion device of a master cylinder piston, which reduces the impact force effect of the whole cold extrusion device and a control method thereof.

In view of the above, the present invention provides a cold extrusion device of a master cylinder piston, comprising:

a work table;

the rack is arranged at one side of the workbench;

an upper supporting table is arranged on the upper side of the frame;

an extrusion lower die is arranged on the workbench;

the extrusion driving mechanism is arranged on the upper supporting table in the direction facing the extrusion lower die;

the extrusion connecting mechanism is arranged at the end part of the extrusion driving mechanism;

and the extrusion upper die is arranged on one side of the extrusion connecting mechanism facing the extrusion lower die, and the extrusion lower die and the extrusion upper die are arranged oppositely.

In the technical scheme, an extrusion cavity which is used for accommodating a blank and forms the appearance of a piston is formed on an extrusion lower die, and an extrusion column which is used for extruding the blank to form the piston cavity is formed on an extrusion upper die; and an extrusion connecting mechanism is arranged between the lower pressurizing die and the extrusion driving mechanism, and buffering and damping are carried out in the extrusion process through the extrusion connecting mechanism, so that the whole practical service life of the equipment is ensured, and the finished product rate of part processing can be ensured.

In the above technical solution, further, the extrusion connection mechanism includes:

the upper connecting plate is fixedly connected with the extrusion driving mechanism;

the lower connecting plate is used for fixing the extrusion upper die;

the connecting and bearing mechanisms are arranged between the upper connecting plate and the lower connecting plate and are distributed in a rectangular shape;

wherein the connection receiving mechanism includes:

the lower supporting table is fixedly connected with the upper connecting plate at one side;

the outer support cylinder is arranged on the other side of the lower support table;

the dampers are uniformly distributed along the circumference and are connected with the lower support table and the outer support cylinder, and the dampers are small dampers;

the middle support cylinder is arranged on the outer support cylinder;

And the inner support rod is arranged on the middle support cylinder, and the other end of the inner support rod is fixedly connected with the lower connecting plate.

In the technical scheme, the arrangement of the upper connecting plate and the lower connecting plate can facilitate the connection between the extrusion connecting mechanism and the extrusion driving mechanism as well as the extrusion upper die; the number of the connecting and receiving mechanisms is 4, and the connecting and receiving devices absorb part of vibration at the extrusion moment and in the extrusion process and play a role in buffering; the connecting and bearing mechanism realizes the two-stage expansion and damping effects through the cooperation of the outer supporting cylinder, the middle supporting cylinder and the inner supporting rod, thereby playing a good role in buffering and damping. The bottom through every connection accepting mechanism all is provided with four dampers, further plays the effect of buffer connection at connection accepting mechanism through the attenuator, simultaneously through four outer spliced poles and set up four connection accepting mechanism and can be better guarantee that lower backup pad does not appear rocking, and then guaranteed cold extrusion process's stability.

In the above technical solution, further, the outer support cylinder includes:

the outer cylinder body is hollow, the middle supporting cylinder is inserted from one end of the outer cylinder body, and an oil inlet and an oil outlet are arranged on the side wall of the outer cylinder body;

An outer sealing sleeve is arranged on one side of the outer cylinder body, which is connected with the middle supporting cylinder, the middle supporting cylinder passes through the outer sealing sleeve, and a sealing ring is arranged between the outer sealing sleeve and the outer cylinder body;

the fixed disk is arranged on one side of the outer cylinder body, which is close to the lower supporting table, and is in threaded fixation with the outer cylinder body;

the outer edge of the fixed disc is provided with a plurality of supporting wings which are uniformly distributed along the circumference, and one end of the damper is connected with the supporting wings;

the bottom of the fixed disc is provided with a plurality of support blocks with arc-shaped sections;

a mounting seat is formed on one side of the lower supporting table, which is close to the outer supporting cylinder, a supporting groove matched with the supporting block is formed on the mounting seat, and a buffer rubber pad is arranged in the supporting groove;

the intermediate support cylinder includes:

the middle cylinder body is in a middle control shape, and the inner supporting rod is inserted from one end of the middle cylinder body;

the bearing seat is arranged on one side of the middle cylinder body, which is close to the outer cylinder body, and is in threaded fit with the middle cylinder body.

In the technical scheme, a two-position three-way electromagnetic valve is connected to an oil inlet and an oil outlet of an outer cylinder through a pipeline, a first channel of the electromagnetic valve is connected with a hydraulic pump through a pipeline, a second channel of the electromagnetic valve is connected with the oil inlet and the oil outlet through a pipeline, and a third channel of the electromagnetic valve is connected with an oil return box through a pipeline; the first position of the valve core is connected with the hydraulic pump and the oil inlet and outlet port, and the second position is connected with the oil inlet and outlet port and the oil return tank; the fixing piece can be used for conveniently sealing the tail end of the outer cylinder body, and the sealing property of the connection between the middle supporting cylinder and the outer cylinder body can be ensured by the arrangement of the outer sealing sleeve; the support wings can facilitate connection of the support columns and the outer support cylinders, and the support blocks and the support grooves can reduce abrasion in cooperation, so that stability of the connection bearing mechanism is further improved. The bearing seat is used for connecting or cutting off the inner part of the middle cylinder body and the outer cylinder body, so that hydraulic oil can conveniently enter the middle cylinder body or be discharged.

In the above technical solution, further, the socket includes:

the cross section of the receiving block is annular, and one end of the middle cylinder, which is close to the outer cylinder, is blocked;

the limiting edge is formed on the side wall of the bearing block and is in an annular shape, the limiting edge abuts against the end face of the middle cylinder body when the bearing block is fixed with the middle cylinder body, the outer wall of one side, close to the middle cylinder body, of the bearing block is provided with threads, and the side wall of the limiting edge abuts against the inner wall of the outer cylinder body;

a lower support edge is formed on the end surface of one side of the bearing block far away from the middle cylinder body in an extending manner;

the guide rod is provided with a penetrating guide hole in the middle of the bearing block, the guide hole is provided with the guide rod in a sliding manner, and two ends of the guide rod extend out of the guide hole;

the guide holes are arranged on the bearing block and are arranged at the outer sides of the displacement guide holes, and the guide holes are uniformly distributed along the circumference;

the sealing cover is in threaded connection with one side of the guide rod, close to the middle cylinder, and covers the guide hole, and the section diameter of the sealing cover is smaller than that of the bearing block;

the lower limit cover is integrally formed on one side of the guide rod, which is close to the outer support cylinder, and the section diameter of the lower limit cover is smaller than that of the lower support edge, and the lower limit cover can slide into the lower support edge;

The limiting spring is arranged in the lower limiting edge, and two ends of the limiting spring are propped against the lower limiting cover and the bearing block;

the guide magnetic block comprises an upper magnetic block and a lower magnetic block, the upper magnetic block is arranged in the lower limiting cover, the lower magnetic block is arranged in the fixed disk and is opposite to the upper magnetic block, and the opposite surfaces of the upper magnetic block and the lower magnetic block are magnetically repelled.

In the technical scheme, the sealing cover seals the diversion hole under the action of the limiting spring in a normal state. When the middle cylinder body is positioned at the innermost position of the outer cylinder body, the lower limit cover can be propped against the fixed disc and partially pressed into the lower support edge, the lower support edge can be propped against the lower limit cover, and the oil inlet and outlet holes are arranged on the side wall of the outer cylinder body positioned on the lower limit edge, so that the flow of oil can not be influenced; and simultaneously, the lower limit cover is propped against the fixed disc, and under the repulsive force of the diversion magnetic block, the lower limit cover is downwards supported to move along the inner movement direction and drives the sealing cover to move upwards, so that the diversion hole is opened, oil can enter the middle cylinder through the diversion hole, and then a part of the inner support rod stretches out conveniently, and meanwhile, the middle cylinder also partially stretches out of the outer cylinder along with the oil pressure of hydraulic oil. After the middle cylinder body is displaced by a certain distance, the repulsive force of the flow guiding magnetic block does not drive the lower limit cover to jack up the sealing cover, the inner support rod stops extending, hydraulic oil continues to enter the outer cylinder body at the moment, so that the middle cylinder body extends to the maximum nearest, and the oil pressure in the outer cylinder body continues to rise, so that the hydraulic oil continues to enter the middle cylinder body through the flow guiding Kong Dingqi sealing cover until the inner support rod extends completely. In the cold extrusion process, the middle cylinder body is pressed into the outer cylinder body at first under the pressure, and the lower bearing seat at the bottom of the middle cylinder body is propped against the fixed disc until the lower limit cover is pressed into the lower limit edge, and then the seal cover is enabled to open the diversion hole, so that the hydraulic oil of the middle cylinder body is conveniently discharged.

In the above technical solution, further, the inner support bar includes:

the inner floating rod is inserted into the middle cylinder body, a connecting external thread is formed at the end part of one end of the inner floating rod, which is far away from the middle cylinder body, and the inner floating rod is connected with the lower connecting plate through the thread;

the middle sleeve is arranged at one side of the middle barrel, which is connected with the inner floating rod, the middle sleeve is connected with the middle barrel through threads, the inner floating rod passes through the middle sleeve, and a sealing ring is arranged between the middle sleeve and the middle sleeve;

the inner floating rod is arranged at one end of the middle cylinder body, and is provided with an inner sliding piston which is in sliding fit with the inner wall of the middle cylinder body;

the piston connecting rod is in threaded connection with the end part of the inner floating rod, a positioning edge is arranged at the end part of the piston connecting rod, which is far away from the inner floating rod, and the inner sliding piston is in sliding fit with the piston connecting rod and is limited by the positioning edge;

the piston connecting rod is sleeved with an inner supporting spring, and two ends of the inner supporting spring are respectively propped against the inner sliding piston and the inner floating rod;

an outer contact block, an outer positioning ring groove is formed in the middle of the middle sleeve, an annular outer contact block is arranged on the outer positioning ring groove, the outer contact block can slide up and down on the outer positioning ring groove, an inner floating rod passes through the outer contact block, and the inner floating rod is in sliding connection with the outer contact block;

Wherein, the middle sleeve is provided with a connecting edge which is propped against the end face of the middle cylinder; the outer contact block is made of rubber, and the depth of the outer placement ring groove is 2-3 times of the thickness of the outer contact block; and a supporting disc with a through hole is arranged in one side of the middle cylinder body, which is close to the bearing seat, and the supporting disc does not influence ejection of the lower sealing cover.

In the technical scheme, a convex threaded connecting sleeve is arranged on a lower connecting plate, and an inner floating rod is connected with the lower connecting plate through the connecting sleeve; the middle sleeve can ensure the sealing effect of the middle cylinder; the inner sliding piston can play a good role in buffering and damping the inner floating rod; the piston connecting rod is matched with the inner supporting spring, so that the inner sliding piston can realize certain floating in the moving process, and a certain decompression buffering effect is achieved in the cold extrusion process; and when the inner floating rod and the middle cylinder body relatively move, the outer contact block can reciprocate in the outer setting ring groove, and the outer contact block and the inner floating rod relatively displace, so that certain vibration is absorbed through friction force generated by the outer contact block, and the good stability of the inner floating rod in expansion and contraction is ensured.

In the above technical scheme, further, the inner support rod further includes:

An inner contact block, wherein an inner placement ring groove is formed in the middle of the side wall of the inner sliding piston, an annular inner contact block is arranged on the inner placement ring groove, the inner contact block can slide up and down on the inner placement ring groove, and the inner contact block is in sliding fit with the inner wall of the middle cylinder;

the middle cylinder body is internally provided with a reinforced support spring, and two ends of the reinforced support spring are respectively propped against the middle sleeve and the inner sliding piston;

an outer support spring is arranged in the direction of the inner sliding piston towards the bottom of the middle cylinder body;

arc-shaped contact parts are formed on two sides of the inner contact block, and the inner contact block is respectively contacted with the inner placement ring groove and the side wall of the middle cylinder body through the arc-shaped contact parts;

one side of the inner sliding piston, which is connected with the outer supporting spring, is provided with a conical connecting bulge, and one end of the outer supporting spring is in interference fit with the connecting bulge; the outer support spring slides along with the inner sliding piston and can be propped against the sealing cover.

In this technical scheme, the interior contact block that sets up can move along with interior sliding piston removes, and when interior sliding piston relatively middle barrel relative movement, interior contact block can be including the internal reciprocating motion of setting groove, and interior supporting shoe relatively middle barrel relative displacement to the frictional force that produces through interior contact block absorbs certain vibration, thereby has further guaranteed the flexible stability of interior bracing piece, and plays good buffering and shock attenuation's effect in cold extrusion process.

In the above technical solution, further, the inner floating rod includes:

the outer connecting cylinder is arranged towards the lower connecting plate, a buffer cavity is formed inwards on one side of the outer connecting cylinder towards the lower connecting plate, an extrusion cavity is formed at the bottom of the buffer cavity, a connecting block is arranged at the bottom of the outer buffer sleeve, hydraulic oil is filled in the extrusion cavity, and the inner supporting spring abuts against the outer buffer sleeve in the inner floating rod;

the inner buffer rod is inserted into the buffer cavity and is in sliding fit with the buffer cavity, and a connecting part is formed at the end part of one side of the inner buffer rod, which is far away from the outer buffer sleeve; the inner floating rod is in threaded connection with the lower connecting plate through an inner buffer rod;

the inner buffer connecting part is formed at one end of the inner buffer rod facing the buffer chamber, a unidirectional buffer groove is formed in the inner buffer connecting part, and the inner buffer connecting part extends into the extrusion chamber and is in sliding fit with the extrusion chamber;

the unidirectional buffer assembly is provided with a unidirectional buffer piece in the unidirectional buffer groove;

the first buffer reflux groove is formed in the outer buffer sleeve and is connected with the buffer cavity, a first reflux hole communicated with the extrusion cavity is formed at the bottom of the first buffer reflux groove, and a first guide flow hole connected with the unidirectional buffer groove and the buffer cavity is formed on the inner buffer connecting part;

And the first adjusting screw is arranged on the side wall of the outer buffer sleeve towards the first buffer reflux groove and is used for adjusting the connection opening degree of the first buffer reflux groove and the first reflux hole.

In this technical scheme, there is the retaining ring at the one side of outer buffer sleeve towards the connecting plate down on threaded connection, is formed with a plurality of evenly distributed's spacing key on the monoloop, is provided with a plurality of spacing spouts with spacing key complex on the inner buffer rod. The extrusion cavity, the buffer cavity and the first buffer reflux groove are filled with hydraulic oil; when the outer support cylinder is pressed to further squeeze the buffer rubber pad, the buffer rubber pad is promoted to be compressed, so that the outer support cylinder moves relative to the lower support table; and when the inner support rod is completely moved into the middle cylinder body and then continuously presses the inner support rod, the inner buffer rod is driven to move into the outer buffer sleeve, the inner buffer connecting part is driven to move into the extrusion cavity, the extrusion cavity is compressed, oil in the extrusion cavity flows to the unidirectional buffer groove through the first buffer reflux groove, the first reflux hole and the first guide flow hole, and then flows back to the extrusion cavity through the unidirectional buffer groove and the unidirectional buffer piece, so that good floating buffer and shock absorption effects are achieved, and the running stability of equipment is improved better.

In the above technical solution, further, the inner floating rod further includes:

the second buffer groove is formed in the outer buffer sleeve, the second buffer groove and the first buffer reflux groove are symmetrically arranged, and a second reflux hole communicated with the extrusion cavity is formed at the bottom of the second buffer groove;

the second adjusting screw is arranged on the side wall of the outer buffer sleeve towards the second buffer groove and used for adjusting the connection opening degree of the second buffer groove and the second backflow hole;

the outer wall of the inner buffer connecting part is connected with the inner buffer rod, the first guide flow hole is connected with the oil receiving groove, a second guide flow hole is arranged on one side of the second buffer groove opposite to the second reflow hole, and the inner buffer connecting part can enable the second guide flow hole to be connected with the oil receiving groove in the moving process.

In the technical scheme, hydraulic oil is filled in the second buffer tank and the unidirectional buffer tank; when the inner floating rod body is extruded, the inner floating rod body can be enabled to have a trend of moving in the outer buffering sleeve, hydraulic oil in the extrusion cavity can flow into the second buffering groove through the second reflow hole, the oil receiving groove is connected with the second guiding flow hole when the inner buffering rod body continues to move, the hydraulic oil enters the first guiding flow hole through the oil receiving hole and then enters the unidirectional buffering groove, and finally flows into the extrusion cavity, so that the inner floating rod slightly floats, and a good buffering supporting effect of the inner floating rod is guaranteed.

In the above technical scheme, further, the unidirectional buffer groove inwards comprises a first connecting hole, a receiving hole and an oil return hole which are sequentially connected and have decreasing diameters from the end surface of the inner buffer connecting part, a conical sealing surface is formed at the joint of the receiving hole and the oil return hole, and the first guide flow hole is connected with the oil return hole;

the unidirectional buffering assembly comprises:

an inner limiting block is connected with the first connecting hole through threads, and a through hole is formed in the middle of the inner limiting block;

the inner buffer spring is arranged at the inner side of the inner limiting block and is positioned on the first connecting hole and the bearing hole;

the sealing block is arranged at one side of the bearing hole connected with the oil return hole and is propped against the inner buffer spring, the section diameter of the sealing block is smaller than the diameter of the bearing hole, and a connecting block which is fixedly matched with the inner buffer spring is formed on the sealing block;

the one-way floating ball is provided with a concave spherical groove on one side of the sealing block facing the oil return hole, the spherical groove is provided with a one-way floating ball capable of freely rolling, and the one-way floating ball can prop against the conical sealing surface.

In this technical scheme, after receiving extruded hydraulic oil and getting into the oil return hole through first direction discharge orifice, can extrude the one-way floater that supports the toper sealed face to impel one-way floater drive sealed shutoff piece and remove, impel hydraulic oil to reach on the first connecting hole after passing through the hole of accepting, later through-hole flow on the stopper can extrude the chamber in through, thereby guaranteed the effect of the good one-way flow of hydraulic oil, and guaranteed the good cushioning effect of interior floating rod.

the outer supporting spring is provided with a supporting disc, and the supporting disc is provided with a supporting disc;

the cold extrusion device further comprises a control cabinet which is externally arranged, a control circuit and a controller pressure detector are arranged in the control cabinet and connected with the controller, a pressure threshold Pa is preset in the controller, the pressure threshold Pa is a range value, and the actual pressure detected by the pressure detector is Pb;

the method for judging whether the closing of the extrusion upper die and the extrusion lower die is abnormal or not by the controller through the fact that the actual pressure is Pb comprises the following steps:

when Pa is larger than Pb, the controller judges that the extrusion upper die and the extrusion lower die are abnormal in closing, and the possible reasons are that foreign matters exist;

when Pa is smaller than Pb, the controller judges that the cold extrusion of the extrusion upper die and the extrusion lower die is abnormal, and the possible reason is that no workpiece or the workpiece is abnormal in size;

and when Pa is in the range of Pb, the control controller judges that the extrusion upper die and the extrusion lower die are normally closed.

In this technical scheme, can set up an audible and visual alarm outward, when Pa is greater than Pb or Pa is less than Pb, the controller all can control the alarm response to play good warning effect, and can be provided with the warning suggestion of different colours according to the pressure condition of difference, thereby can be convenient for operating personnel's in time maintain and inspect.

The beneficial effects of the invention are as follows:

1. the extrusion connecting mechanism plays a good role in buffering and damping in the cold extrusion process, so that the stability of equipment is ensured;

2. the stability of the extrusion connecting mechanism can be further improved through a two-stage telescopic and damping structure;

3. whether the cold extrusion process is abnormal or not is judged through different pressure values, so that an operator can monitor the processing process conveniently.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of a connection receiving mechanism according to the present invention;

FIG. 3 is a schematic view of the structure of the inner floating rod of the present invention;

the label in the figure is: 1-extrusion lower die, 2-extrusion driving mechanism, 3-oil inlet and outlet, 4-extrusion upper die, 5-upper connecting plate, 6-lower connecting plate, 7-lower supporting table, 8-outer cylinder, 9-outer seal sleeve, 10-fixed disk, 11-supporting wing, 12-buffer rubber pad, 13-intermediate cylinder, 14-bearing block, 15-limit edge, 16-lower supporting edge, 17-guide bar, 18-guide hole, 19-seal cover, 20-lower limit cover, 21-limit spring, 22-upper magnetic block, 23-lower magnetic block, 24-inner slide piston, 25-piston connecting rod, 26-inner supporting spring, 27-outer contact block, 28-supporting disk, 29-inner contact block, 30-reinforcing supporting spring, 31-outer supporting spring, 32-intermediate sleeve, 34-buffer cavity, 35-extrusion cavity, 36-inner buffer bar, 37-first reflow hole, 38-first guide hole, 39-second reflow hole, 40-second reflow hole, 41-second adjusting groove, 42-oil groove, 43-guide groove, 45-seal groove, 46-seal ball joint, 46-inner seal block, 35-inner seal ball joint, 45-seal groove, 45-seal ball joint, 46-inner seal groove, and one-way buffer groove joint, 54-first adjusting screw.

Detailed Description

Technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application are within the scope of the protection of the present application.

Example 1:

the embodiment provides a cold extrusion device of master cylinder piston, includes:

a work table;

the rack is arranged at one side of the workbench;

an upper supporting table is arranged on the upper side of the frame;

an extrusion lower die 1, wherein the extrusion lower die 1 is arranged on a workbench;

the extrusion driving mechanism 2 is arranged on the upper supporting table in the direction towards the extrusion lower die 1;

the extrusion connecting mechanism is arranged at the end part of the extrusion driving mechanism 2;

the extrusion upper die 4 is arranged on one side of the extrusion connecting mechanism facing the extrusion lower die 1, and the extrusion lower die 1 and the extrusion upper die 4 are arranged opposite.

In the embodiment, an extrusion cavity 35 which is used for accommodating blanks and forms a piston shape is formed on the extrusion lower die 1, and an extrusion column which is used for extruding the blanks to form the piston cavity is formed on the extrusion upper die 4; an extrusion connecting mechanism is arranged between the lower pressurizing die and the extrusion driving mechanism 2, and buffering and damping are carried out in the extrusion process through the extrusion connecting mechanism, so that the whole practical service life of the equipment is ensured, and the finished product rate of part processing can be ensured.

Example 2:

the present embodiment provides a cold extrusion device of a master cylinder piston having the following technical features in addition to the technical scheme including the above embodiment.

The extrusion connection mechanism includes:

the upper connecting plate 5 is fixedly connected with the extrusion driving mechanism 2;

the lower connecting plate 6 is used for fixing the extrusion upper die 4;

the connecting and bearing mechanisms are arranged between the upper connecting plate 5 and the lower connecting plate 6 and are distributed in a rectangular shape;

wherein the connection receiving mechanism includes:

the lower support table 7, one side of the lower support table 7 is fixedly connected with the upper connecting plate 5;

an outer support cylinder, a lower support cylinder is arranged on the other side of the lower support table 7;

the dampers are uniformly distributed along the circumference and are connected with the lower support table 7 and the outer support cylinder, and the dampers are small dampers;

the middle support cylinder is arranged on the outer support cylinder;

and the inner support rod is arranged on the middle support cylinder, and the other end of the inner support rod is fixedly connected with the lower connecting plate 6.

In the embodiment, the arrangement of the upper connecting plate 5 and the lower connecting plate 6 can facilitate the connection between the extrusion connecting mechanism and the extrusion driving mechanism 2 and the extrusion upper die 4; the number of the connecting and receiving mechanisms is 4, and the connecting and receiving devices absorb part of vibration at the extrusion moment and in the extrusion process and play a role in buffering; the connecting and bearing mechanism realizes the two-stage expansion and damping effects through the cooperation of the outer supporting cylinder, the middle supporting cylinder and the inner supporting rod, thereby playing a good role in buffering and damping. The bottom through every connection accepting mechanism all is provided with four dampers, further plays the effect of buffer connection at connection accepting mechanism through the attenuator, simultaneously through four outer spliced poles and set up four connection accepting mechanism and can be better guarantee that lower backup pad does not appear rocking, and then guaranteed cold extrusion process's stability.

Example 3:

The outer support cylinder includes:

the outer cylinder body 8, the outer cylinder body 8 is hollow, the middle support cylinder is inserted from one end of the outer cylinder body 8, and the side wall of the outer cylinder body 8 is provided with an oil inlet and outlet 3;

an outer sealing sleeve 9, wherein the outer sealing sleeve 9 is arranged on one side of the outer cylinder 8 connected with the middle supporting cylinder, the middle supporting cylinder passes through the outer sealing sleeve 9, and a sealing ring is arranged between the outer sealing sleeve 9 and the outer cylinder 8;

a fixed disk 10, wherein the fixed disk 10 is arranged on one side of the outer cylinder 8, which is close to the lower supporting table 7, and the fixed disk 10 is in threaded fixation with the outer cylinder 8;

the outer edge of the fixed disc 10 is provided with a plurality of supporting wings 11 which are uniformly distributed along the circumference, and one end of the damper is connected with the supporting wings 11;

the bottom of the fixed disc 10 is provided with a plurality of support blocks with arc-shaped sections;

a mounting seat is formed on one side of the lower supporting table 7, which is close to the outer supporting cylinder, a supporting groove matched with the supporting block is formed on the mounting seat, and a buffer rubber pad 12 is arranged in the supporting groove;

The intermediate support cylinder includes:

the middle cylinder body 13, the middle cylinder body 13 is in a central control shape, and the inner supporting rod is inserted from one end of the middle cylinder body 13;

the middle cylinder 13 is provided with a bearing seat on one side close to the outer cylinder 8, and the bearing seat is in threaded fit with the middle cylinder 13.

In the embodiment, a two-position three-way electromagnetic valve is connected to the oil inlet and outlet 3 of the outer cylinder 8 through a pipeline, a first channel of the electromagnetic valve is connected with a hydraulic pump through a pipeline, a second channel of the electromagnetic valve is connected with the oil inlet and outlet 3 through a pipeline, and a third channel of the electromagnetic valve is connected with an oil return box through a pipeline; the first position of the valve core is connected with the hydraulic pump and the oil inlet and outlet port 3, and the second position is connected with the oil inlet and outlet port and the oil return tank; the fixed sheet can conveniently seal the tail end of the outer cylinder 8, and the outer sealing sleeve 9 can ensure the tightness of the connection between the middle supporting cylinder and the outer cylinder 8; the arrangement of the supporting wings 11 can facilitate the connection of the supporting columns and the outer supporting cylinders, and the cooperation of the supporting blocks and the supporting grooves can reduce abrasion, so that the stability of the connection bearing mechanism is further improved. The socket is used for connecting or disconnecting the inner part of the middle cylinder 13 with the outer cylinder 8, so that hydraulic oil can enter the middle cylinder 13 or be discharged conveniently.

Example 4:

The socket includes:

the cross section of the bearing block 14 is annular, and one end of the middle cylinder 13, which is close to the outer cylinder 8, is blocked;

the limiting edge 15 is formed on the side wall of the bearing block 14, the annular limiting edge 15 is propped against the end face of the middle cylinder 13 when the bearing block 14 is fixed with the middle cylinder 13, the outer wall of the bearing block 14, which is positioned on one side of the limiting edge 15 near the middle cylinder 13, is provided with threads, and the side wall of the limiting edge 15 is propped against the inner wall of the outer cylinder 8;

a lower support edge 16, wherein the lower support edge 16 is formed on the end surface of one side of the bearing block 14 away from the middle cylinder 13 in an extending manner;

the guide rod 17 is provided with a penetrating guide hole in the middle of the bearing block 14, the guide rod 17 is arranged on the guide hole in a sliding manner, and the two ends of the guide rod 17 extend out of the guide hole;

the diversion holes 18 are arranged on the bearing block 14 and outside the displacement guide holes, and a plurality of diversion holes 18 which are uniformly distributed along the circumference are arranged;

a sealing cover 19, wherein the sealing cover 19 is connected with one side of the guide rod 17, which is close to the middle cylinder 13, in a threaded manner, the sealing cover 19 covers the diversion hole 18, and the section diameter of the sealing cover is smaller than that of the bearing block 14;

The lower limit cover 20 is integrally formed on one side of the guide rod 17, which is close to the outer support cylinder, and the lower limit cover 20 with the section diameter smaller than that of the lower support edge 16 is formed on one side of the guide rod, and the lower limit cover 20 can slide into the lower support edge 16;

the limiting spring 21 is arranged in the lower limiting edge 15, and two ends of the limiting spring 21 are propped against the lower limiting cover 20 and the bearing block 14;

the guide magnetic block comprises an upper magnetic block 22 and a lower magnetic block 23, the upper magnetic block 22 is arranged in the lower limit cover 20, the lower magnetic block 23 is arranged in the fixed disk 10 and is opposite to the upper magnetic block 22, and the opposite surfaces of the upper magnetic block 22 and the lower magnetic block 23 are magnetically repelled.

In this embodiment, the seal cover 19 normally closes the deflector hole 18 under the action of the stopper spring 21. When the middle cylinder 13 is positioned at the innermost position of the outer cylinder 8, the lower limit cover 20 is propped against the fixed disc 10 and is partially pressed into the lower support edge 16, the lower support edge 16 is propped against the lower limit cover 20, and the oil inlet and outlet holes are arranged on the side wall of the outer cylinder 8 where the lower limit edge 15 is positioned, so that the flow of oil can not be influenced; meanwhile, the lower limit cover 20 is propped against the fixed disc 10, and under the repulsive force of the diversion magnetic blocks, the lower limit cover 20 moves downwards in the support edge 16 and drives the sealing cover 19 to move upwards, so that the diversion hole 18 is opened, at the moment, oil can enter the middle cylinder 13 through the diversion hole 18, a part of the inner support rod can extend conveniently, and meanwhile, the middle cylinder 13 also partially extends out of the outer cylinder 8 along with the oil pressure of hydraulic oil. After the middle cylinder 13 is displaced by a certain distance, the repulsive force of the diversion magnet does not notice to drive the lower limit cover 20 to jack up the sealing cover 19, the inner support rod stops extending, at the moment, hydraulic oil continues to enter the outer cylinder 8, so that the middle cylinder 13 extends to the maximum nearest, and after the middle cylinder 13 is displaced, the oil pressure in the outer cylinder 8 continues to rise, so that the hydraulic oil jacks up the sealing cover 19 through the diversion hole 18, so that the hydraulic oil continues to enter the middle cylinder 13 until the inner support rod extends completely. In the cold extrusion process, the middle cylinder 13 is pressed into the outer cylinder 8 under the pressure, until the lower bearing seat at the bottom of the middle cylinder 13 is propped against the fixed disk 10, the lower limit cover 20 is pressed into the lower limit edge 15, and then the seal cover 19 is made to open the diversion hole 18, so that the hydraulic oil of the middle cylinder 13 is conveniently discharged.

Example 5:

The inner support rod comprises:

the inner floating rod is inserted into the middle cylinder 13, a connecting external thread is formed at the end part of one end of the inner floating rod, which is far away from the middle cylinder 13, and the inner floating rod is connected with the lower connecting plate 6 through the thread;

the middle sleeve 32 is arranged on one side of the middle cylinder 13, which is connected with the inner floating rod, the middle sleeve 32 is connected with the middle cylinder 13 through threads, the inner floating rod passes through the middle sleeve 32, and a sealing ring is arranged between the middle sleeve 32 and the middle sleeve 32;

a sliding piston 24 is arranged at one end of the inner floating rod, which is positioned in the middle cylinder 13, and the sliding piston 24 is in sliding fit with the inner wall of the middle cylinder 13;

the piston connecting rod 25 is in threaded connection with the end part of the inner floating rod, a positioning edge is arranged at the end part of the piston connecting rod 25, which is far away from the inner floating rod, and the inner sliding piston 24 is in sliding fit with the piston connecting rod 25 and is limited by the positioning edge;

an inner support spring 26, wherein the piston connecting rod 25 is sleeved with the inner support spring 26, and two ends of the inner support spring 26 are respectively propped against the inner sliding piston 24 and the inner floating rod;

An outer contact block 27, an outer setting ring groove is formed in the middle of the middle sleeve 32, an annular outer contact block 27 is arranged on the outer setting ring groove, the outer contact block 27 can slide up and down on the outer setting ring groove, an inner floating rod passes through the outer contact block 27, and the inner floating rod is connected with the outer contact block 27 in a sliding manner;

wherein the middle sleeve 32 is provided with a connecting edge which is propped against the end face of the middle cylinder 13; the outer contact block 27 is made of rubber, and the depth of the outer placement ring groove is 2-3 times of the thickness of the outer contact block 27; and a support disc 28 with a through hole is arranged in one side of the middle cylinder 13 close to the bearing seat, and the support disc 28 does not influence the ejection of the lower sealing cover 19.

In the embodiment, a convex threaded connecting sleeve is arranged on the lower connecting plate 6, and the inner floating rod is connected with the lower connecting plate 6 through the connecting sleeve; the intermediate sleeve 32 can ensure the sealing effect of the intermediate cylinder 13; the inner sliding piston 24 can have good buffering and damping effects on the inner floating rod; the cooperation of the piston connecting rod 25 and the inner supporting spring 26 can enable the inner sliding piston 24 to realize certain floating in the moving process, so that a certain decompression buffering effect is achieved in the cold extrusion process; and the outer contact block 27 is arranged to reciprocate in the outer setting ring groove when the inner floating rod and the middle cylinder 13 relatively move, and the outer contact block 27 and the inner floating rod relatively move, so that certain vibration is absorbed through friction force generated by the outer contact block 27, and the good stability of the inner floating rod in expansion and contraction is ensured.

Example 6:

The inner support rod further comprises:

an inner contact block 29, an inner placement ring groove is formed in the middle of the side wall of the inner sliding piston 24, an annular inner contact block 29 is arranged on the inner placement ring groove, the inner contact block 29 can slide up and down on the inner placement ring groove, and the inner contact block 29 is in sliding fit with the inner wall of the middle cylinder 13;

a reinforcing support spring 30, wherein the reinforcing support spring 30 is arranged in the middle cylinder 13, and two ends of the reinforcing support spring 30 respectively prop against the middle sleeve 32 and the inner sliding piston 24;

an outer support spring 31, the outer support spring 31 being provided in a direction in which the inner slide piston 24 faces the bottom of the intermediate cylinder 13;

wherein, two sides of the inner contact block 29 are provided with arc contact parts, and the inner contact block 29 is respectively contacted with the inner placement ring groove and the side wall of the middle cylinder 13 through the arc contact parts;

a conical connecting protrusion is formed on one side of the inner sliding piston 24 connected with the outer supporting spring 31, and one end of the outer supporting spring 31 is in interference fit with the connecting protrusion; the outer support spring 31 follows the sliding piston 24 and can bear against the sealing cover 19.

In this embodiment, the inner contact block 29 is disposed to move along with the movement of the inner sliding piston 24, when the inner sliding piston 24 moves relatively to the middle cylinder 13, the inner contact block 29 moves reciprocally in the inner accommodating groove, and the inner support block moves relatively to the middle cylinder 13, so that a certain vibration is absorbed by the friction force generated by the inner contact block 29, thereby further ensuring the stability of the expansion and contraction of the inner support rod, and playing a good role in buffering and damping in the cold extrusion process.

Example 7:

The inner floating rod includes:

the outer buffer sleeve 33 is arranged towards the lower connecting plate 6, a buffer cavity 34 is formed inwards on one side of the outer connecting cylinder towards the lower connecting plate 6, an extrusion cavity 35 is arranged at the bottom of the buffer cavity 34, a connecting block is arranged at the bottom of the outer buffer sleeve 33, hydraulic oil is filled in the extrusion cavity 35, and the inner supporting spring 26 abuts against the outer buffer sleeve 33 in the inner floating rod;

an inner buffer rod 36, wherein the inner buffer rod 36 is inserted into the buffer cavity 34 and is in sliding fit with the buffer cavity 34, and a connecting part is formed at one end part of the inner buffer rod 36 far away from the outer buffer sleeve 33; the inner floating rod is in threaded connection with the lower connecting plate 6 through an inner buffer rod 36;

An inner buffer connection part 44, wherein the inner buffer connection part 44 is formed on one end of the inner buffer rod 36 facing the chamber of the buffer chamber 34, a unidirectional buffer groove 45 is formed in the inner buffer connection part 44, and the inner buffer connection part 44 extends into the extrusion chamber 35 and is in sliding fit with the extrusion chamber 35;

a unidirectional buffer assembly, in which unidirectional buffer members are arranged in the unidirectional buffer grooves 45;

a first buffer reflux groove 53, a first buffer reflux groove 53 connected with the buffer cavity 34 is formed in the outer buffer sleeve 33, a first reflux hole 37 communicated with the extrusion cavity 35 is arranged at the bottom of the first buffer reflux groove 53, and a first guide flow hole 38 connected with the unidirectional buffer groove 45 and the buffer cavity 34 is arranged on the inner buffer connecting part 44;

the first adjusting screw 54 is provided on the side wall of the outer buffer sleeve 33 to the first buffer return groove 53, and the first adjusting screw 54 is provided to adjust the opening degree of the connection between the first buffer return groove 53 and the first return hole 37.

In this embodiment, a retainer ring is screwed on one side of the downward connecting plate 6 of the outer buffer sleeve 33, a plurality of uniformly distributed limit keys are formed on a single ring, and a plurality of limit sliding grooves matched with the limit keys are formed on the inner buffer rod 36. Wherein hydraulic oil is filled in the extrusion cavity 35, the buffer cavity 34 and the first buffer reflux groove 53; when the outer support cylinder is pressed to further press the buffer rubber pad 12, the buffer rubber pad 12 is promoted to be compressed, so that the outer support cylinder moves relative to the lower support table 7; and when the inner support rod is completely moved into the middle cylinder 13 and then continuously presses the inner support rod, the inner buffer rod 36 is driven to move towards the inside of the outer buffer sleeve 33, the inner buffer connecting part 44 is driven to move towards the inside of the extrusion cavity 35, the extrusion cavity 35 is compressed, oil in the extrusion cavity 35 flows to the unidirectional buffer groove 45 through the first buffer reflux groove 53, the first reflux hole 37 and the first guide orifice 38, and then flows back to the extrusion cavity 35 through the unidirectional buffer groove 45 and the unidirectional buffer piece, so that the effects of good floating buffer and shock absorption are achieved, and the stability of equipment operation is better improved.

Example 8:

The inner floating rod further comprises:

the second buffer groove 39, the second buffer groove 39 is formed in the outer buffer sleeve 33, the second buffer groove 39 and the first buffer reflux groove 53 are symmetrically arranged, and the bottom of the second buffer groove 39 is provided with a second reflux hole 40 communicated with the extrusion cavity 35;

a second adjusting screw 41, wherein the second adjusting screw 41 for adjusting the connection opening degree of the second buffer groove 39 and the second reflow hole 40 is arranged on the second buffer groove 39 on the side wall of the outer buffer sleeve 33;

wherein, the inner buffer rod 36 is connected to the outer wall of the inner buffer connection portion 44, the first guide flow hole 38 is connected to the inner buffer rod 42, and the second buffer groove 39 is provided with a second guide flow hole 43 on a side opposite to the second return flow hole 40, and the inner buffer connection portion 44 connects the second guide flow hole 43 to the inner buffer rod 42 during moving.

In the present embodiment, the second buffer tank 39 and the unidirectional buffer tank 45 are filled with hydraulic oil; when the inner floating rod body is extruded, the inner buffer rod 36 has a tendency of moving in the outer buffer sleeve 33, and hydraulic oil in the extrusion cavity 35 flows into the second buffer groove 39 through the second backflow hole 40, and when the inner buffer rod 36 continues to move, the oil receiving groove 42 is connected with the second guide flow hole 43, so that the hydraulic oil enters the first guide flow hole 38 through the oil receiving hole and then enters the unidirectional buffer groove 45, and finally flows into the extrusion cavity 35, so that the inner floating rod slightly floats, and the good buffer supporting effect of the inner floating rod is ensured.

Example 9:

The unidirectional buffer groove 45 comprises a first connecting hole, a receiving hole and an oil return hole 52 which are sequentially connected and have decreasing diameters inwards from the end surface of the inner buffer connecting part 44, a conical sealing surface 46 is formed at the joint of the receiving hole and the oil return hole 52, and the first guide flow hole 38 is connected with the oil return hole 52;

the unidirectional buffering assembly comprises:

an inner limiting block 47, wherein the inner limiting block 47 is connected to the first connecting hole in a threaded manner, and a through hole is formed in the middle of the inner limiting block 47;

an inner buffer spring 48, wherein the inner buffer spring 48 is arranged at the inner side of the inner limiting block 47, and the inner buffer spring 48 is positioned on the first connecting hole and the receiving hole;

a sealing block 49, wherein the sealing block 49 which is propped against the inner buffer spring 48 is arranged on one side of the connecting hole connected with the oil return hole 52, the diameter of the section of the sealing block 49 is smaller than that of the connecting hole, and a connecting block which is fixedly matched with the inner buffer spring 48 is formed on the sealing block 49;

the one-way floating ball 50 is provided with a concave spherical groove on one side of the sealing block 49 facing the oil return hole 52, the one-way floating ball 50 capable of freely rolling is arranged on the spherical groove, and the one-way floating ball 50 can prop against the conical sealing surface 46.

In this embodiment, when the hydraulic oil is extruded to enter the oil return hole 52 through the first guiding flow hole 38, the unidirectional floating ball 50 abutting against the conical sealing surface 46 is extruded, so that the unidirectional floating ball 50 is driven to move the sealing block 49, the hydraulic oil is driven to reach the first connecting hole after passing through the receiving hole, and then the hydraulic oil flows to extrude the cavity 35 through the through hole on the inner limiting block 47, so that a good unidirectional flow effect of the hydraulic oil is ensured, and a good buffering effect of the inner floating rod is ensured.

Example 10:

The inner floating rod further comprises:

the outer supporting block 51 is provided with a fixed outer supporting block 51 at the bottom of the outer supporting spring 31, the outer supporting block 51 can be propped against the sealing cover 19, and the outer supporting block 51 is provided with a pressure sensor in extrusion contact with the supporting disc 28;

The method for judging whether the extrusion upper die 4 and the extrusion lower die 1 are abnormally closed or not by the controller through the fact that the actual pressure is Pb comprises the following steps:

when Pa is larger than Pb, the controller judges that the upper extrusion die 4 and the lower extrusion die 1 are abnormally closed, and the possible reasons are that foreign matters exist;

when Pa is smaller than Pb, the controller judges that the cold extrusion of the extrusion upper die 4 and the extrusion lower die 1 is abnormal, and the possible reason is that no workpiece or the workpiece is abnormal in size;

when Pa is within Pb, the controller judges that the upper extrusion die 4 and the lower extrusion die 1 are normally closed.

In this embodiment, an audible and visual alarm may be provided, and when Pa is greater than Pb or Pa is less than Pb, the controller will control the alarm to respond, so as to play a good role in warning, and may be provided with alarm prompts of different colors according to different pressure conditions, so as to facilitate timely maintenance and inspection of operators.

The embodiments of the present application and the features of the embodiments may be combined without conflict, and the present application is not limited to the specific embodiments described above, which are merely illustrative, not restrictive, and many forms may be made by those of ordinary skill in the art, without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. A cold extrusion device of a master cylinder piston, comprising:

a work table;

the rack is arranged at one side of the workbench;

an upper supporting table is arranged on the upper side of the frame;

an extrusion lower die (1), wherein the extrusion lower die (1) is arranged on the workbench;

the extrusion driving mechanism (2) is arranged on the upper supporting table in the direction towards the extrusion lower die (1);

the extrusion connecting mechanism is arranged at the end part of the extrusion driving mechanism (2);

the extrusion upper die (4) is arranged on one side of the extrusion connecting mechanism, which faces the extrusion lower die (1), and the extrusion lower die (1) and the extrusion upper die (4) are arranged oppositely.

2. The cold extrusion apparatus of a master cylinder piston as recited in claim 1, wherein said extrusion connection mechanism comprises:

the upper connecting plate (5), the said upper connecting plate (5) is fixedly connected with extrusion driving mechanism (2);

the lower connecting plate (6), the said lower connecting plate (6) is used for fixing the upper die (4) of extrusion;

the connecting and bearing mechanisms are arranged between the upper connecting plate (5) and the lower connecting plate (6) and are distributed in a rectangular shape;

wherein the connection receiving mechanism comprises:

The lower support table (7), one side of the lower support table (7) is fixedly connected with the upper connecting plate (5);

the other side of the lower supporting table (7) is provided with a lower supporting cylinder;

a plurality of dampers (35) which are uniformly distributed along the circumference and are connected with the lower supporting table (7) and the outer supporting cylinder are arranged between the lower supporting table (7) and the outer supporting cylinder;

the middle support cylinder is arranged on the outer support cylinder;

the middle supporting cylinder is provided with an inner supporting rod, and the other end of the inner supporting rod is fixedly connected with the lower connecting plate (6).

3. A cold extrusion apparatus of a master cylinder piston as recited in claim 2, wherein said outer support cylinder comprises:

the outer cylinder body (8), the outer cylinder body (8) is hollow, the middle supporting cylinder is inserted from one end of the outer cylinder body (8), and the side wall of the outer cylinder body (8) is provided with an oil inlet and outlet (3);

an outer sealing sleeve (9), wherein an outer sealing sleeve (9) is arranged on one side of the outer cylinder (8) connected with the middle supporting cylinder, and the middle supporting cylinder passes through the outer sealing sleeve (9);

a fixed disc (10), wherein the fixed disc (10) is arranged on one side of the outer cylinder (8) close to the lower supporting table (7), and the fixed disc (10) is in threaded fixation with the outer cylinder (8);

The outer edge of the fixed disc (10) is provided with a plurality of supporting wings (11) which are uniformly distributed along the circumference, and one end of the damper (35) is connected with the supporting wings (11);

the bottom of the fixed disc (10) is provided with a plurality of support blocks with arc-shaped sections;

a mounting seat is formed on one side of the lower supporting table (7) close to the outer supporting cylinder, a supporting groove matched with the supporting block is formed on the mounting seat, and a buffer rubber pad (12) is arranged in the supporting groove;

the middle support cylinder comprises:

the middle cylinder body (13), the middle cylinder body (13) is in a central control shape, and the inner support rod is inserted from one end of the middle cylinder body (13);

the middle cylinder body (13) is provided with a bearing seat on one side close to the outer cylinder body (8), and the bearing seat is in threaded fit with the middle cylinder body (13).

4. A cold extrusion apparatus for a master cylinder piston as set forth in claim 3 wherein said socket includes:

the section of the bearing block (14) is annular, and one end, close to the outer cylinder (8), of the middle cylinder (13) is blocked;

the limiting edge (15) is formed on the side wall of the bearing block (14), the annular limiting edge (15) is abutted against the end face of the middle cylinder (13) when the bearing block (14) is fixed with the middle cylinder (13), threads are formed on the outer wall of the bearing block (14) positioned on one side, close to the middle cylinder (13), of the limiting edge (15), and the side wall of the limiting edge (15) is abutted against the inner wall of the outer cylinder (8);

A lower support edge (16) is formed on the end surface of one side of the bearing block (14) far away from the middle cylinder (13) in an extending way, and the lower support edge (16) is formed on the end surface;

the guide rod (17) is provided with a penetrating guide hole in the middle of the bearing block (14), the guide hole is provided with the guide rod (17) in a sliding manner, and two ends of the guide rod (17) extend out of the guide hole;

the guide holes (18) are formed in the bearing block (14) and the outer sides of the displacement guide holes are provided with a plurality of guide holes (18) which are uniformly distributed along the circumference;

the sealing cover (19) is connected with the sealing cover (19) on one side of the guide rod (17) close to the middle cylinder body (13) in a threaded manner, and the sealing cover (19) covers the diversion hole (18) and has a section diameter smaller than that of the bearing block (14);

the lower limit cover (20) is integrally formed on one side, close to the outer support cylinder, of the guide rod (17), the lower limit cover (20) with the section diameter smaller than that of the lower support edge (16) is arranged on one side, close to the outer support cylinder, of the guide rod, and the lower limit cover (20) can slide into the lower support edge (16);

the limiting spring (21) is arranged in the lower limiting edge (15), and two ends of the limiting spring (21) are propped against the lower limiting cover (20) and the bearing block (14);

the guide magnetic block comprises an upper magnetic block (22) and a lower magnetic block (23), wherein the upper magnetic block (22) is arranged in a lower limiting cover (20), the lower magnetic block (23) is arranged in the fixed disk (10) and is opposite to the upper magnetic block (22), and the opposite surfaces of the upper magnetic block (22) and the lower magnetic block (23) are magnetically repulsed.

5. The cold extrusion apparatus of a master cylinder piston as recited in claim 4, wherein the inner support rod comprises:

the inner floating rod is inserted into the middle cylinder (13), one end part of the inner floating rod, which is far away from the middle cylinder (13), is provided with a connecting external thread, and the inner floating rod is connected with the lower connecting plate (6) through the thread;

the middle sleeve (32) is arranged on one side of the middle cylinder (13) connected with the inner floating rod, the middle sleeve (32) is connected with the middle cylinder (13) through threads, and the inner floating rod passes through the middle sleeve (32);

the inner sliding piston (24) is arranged at one end of the inner floating rod, which is positioned in the middle cylinder (13), and the inner sliding piston (24) is in sliding fit with the inner wall of the middle cylinder (13);

the piston connecting rod (25) is in threaded connection with the end part of the inner floating rod, a positioning edge is arranged at the end part of the piston connecting rod (25) far away from the inner floating rod, and the inner sliding piston (24) is in sliding fit with the piston connecting rod (25) and is limited by the positioning edge;

an inner support spring (26), wherein the piston connecting rod (25) is sleeved with the inner support spring (26), and two ends of the inner support spring (26) are respectively propped against the inner sliding piston (24) and the inner floating rod;

An outer contact block (27), an outer placement ring groove is formed in the middle of the middle sleeve (32), an annular outer contact block (27) is arranged on the outer placement ring groove, the outer contact block (27) can slide up and down on the outer placement ring groove, the inner floating rod passes through the outer contact block (27), and the inner floating rod is in sliding connection with the outer contact block (27);

wherein the middle sleeve (32) is provided with a connecting edge which is propped against the end face of the middle cylinder (13); the outer contact block (27) is made of rubber, and the depth of the outer placement ring groove is 2-3 times of the thickness of the outer contact block (27); and a support disc (28) with a through hole is arranged in one side of the middle cylinder (13) close to the bearing seat.

6. The cold extrusion apparatus of a master cylinder piston as recited in claim 5, wherein the inner support rod further comprises:

an inner contact block (29), an inner placement ring groove is formed in the middle of the side wall of the inner sliding piston (24), an annular inner contact block (29) is arranged on the inner placement ring groove, the inner contact block (29) can slide up and down on the inner placement ring groove, and the inner contact block (29) is in sliding fit with the inner wall of the middle cylinder (13);

a reinforcing support spring (30), wherein the reinforcing support spring (30) is arranged in the middle cylinder (13), and two ends of the reinforcing support spring (30) are respectively propped against the middle sleeve (32) and the inner sliding piston (24);

An outer support spring (31), wherein the outer support spring (31) is arranged in the direction of the inner sliding piston (24) towards the bottom of the middle cylinder (13);

arc-shaped contact parts are formed on two sides of the inner contact block (29), and the inner contact block (29) is respectively contacted with the inner installation ring groove and the side wall of the middle cylinder body (13) through the arc-shaped contact parts;

a conical connecting bulge is formed on one side of the inner sliding piston (24) connected with the outer supporting spring (31), and one end of the outer supporting spring (31) is in interference fit with the connecting bulge; the outer supporting spring (31) slides along the inner sliding piston (24) and can be propped against the sealing cover (19).

7. The cold extrusion apparatus of a master cylinder piston as recited in claim 6, wherein said inner floating rod comprises:

the outer buffer sleeve (33) is arranged towards the lower connecting plate (6), a buffer cavity (34) is formed inwards on one side, far away from the lower connecting plate (6), of the outer buffer sleeve (33), an extrusion cavity (35) is formed at the bottom of the buffer cavity (34), and the outer buffer sleeve (33) is inserted on the middle cylinder (13);

an inner buffer rod (36), wherein the inner buffer rod (36) is inserted on the outer buffer sleeve (33), and the inner buffer rod (36) is inserted into the buffer cavity (34) and is in sliding fit with the buffer cavity (34);

An inner buffer connection part (44), wherein an inner buffer connection part (44) is formed at one end of the inner buffer rod (36) facing the buffer cavity (34) chamber, a unidirectional buffer groove (45) is formed in the inner buffer connection part (44), and the inner buffer connection part (44) extends into the extrusion cavity (35) and is in sliding fit with the extrusion cavity (35);

the unidirectional buffer assembly is provided with a unidirectional buffer piece in the unidirectional buffer groove (45);

a first buffer reflux groove (53), a first buffer reflux groove (53) connected with the buffer cavity (34) is formed in the outer buffer sleeve (33), a first reflux hole (37) communicated with the extrusion cavity (35) is arranged at the bottom of the first buffer reflux groove (53), and a first guide orifice (38) connected with the unidirectional buffer groove (45) and the buffer cavity (34) is arranged on the inner buffer connecting part (44);

the first adjusting screw (54) is arranged on the side wall of the outer buffer sleeve (33) towards the first buffer reflux groove (53), and the first adjusting screw (54) for adjusting the connection opening degree of the first buffer reflux groove (53) and the first reflux hole (37) is arranged on the side wall of the outer buffer sleeve.

8. The cold extrusion apparatus of a master cylinder piston as recited in claim 7, wherein said inner floating rod further comprises:

the second buffer groove (39) is formed in the outer buffer sleeve (33), the second buffer groove (39) and the first buffer reflux groove (53) are symmetrically arranged, and a second reflux hole (40) communicated with the extrusion cavity (35) is formed at the bottom of the second buffer groove (39);

The second adjusting screw (41) is arranged on the side wall of the outer buffer sleeve (33) towards the second buffer groove, and the second adjusting screw (41) for adjusting the connection opening degree of the second buffer groove (39) and the second reflow hole (40) is arranged on the second buffer groove;

the inner buffer connecting part (44) is provided with an oil receiving groove (42) at the position where the outer wall of the inner buffer connecting part (44) is connected with the inner buffer rod (36), the first guide flow hole (38) is connected with the oil receiving groove (42), one side of the second buffer groove (39) opposite to the second return hole (40) is provided with a second guide flow hole (43), and the inner buffer connecting part (44) can enable the second guide flow hole (43) to be connected with the oil receiving groove (42) in the moving process.

9. The cold extrusion device of a master cylinder piston according to claim 8, wherein the unidirectional buffer groove (45) comprises a first connecting hole, a receiving hole and an oil return hole (52) which are sequentially connected and have decreasing diameters inwards from the end surface of the inner buffer connecting part (44), and a conical sealing surface (46) is formed at the connection part of the receiving hole and the oil return hole (52);

the unidirectional buffering assembly comprises:

an inner limiting block (47), wherein the first connecting hole is in threaded connection with the inner limiting block (47), and a through hole is formed in the middle of the inner limiting block (47);

an inner buffer spring (48), wherein the inner buffer spring (48) is arranged at the inner side of the inner limiting block (47), and the inner buffer spring (48) is positioned on the first connecting hole and the receiving hole;

A sealing block (49), wherein one side of the bearing hole connected with the oil return hole (52) is provided with a sealing block (49) propped against the inner buffer spring (48), the cross section diameter of the sealing block (49) is smaller than the diameter of the bearing hole, and a connecting block fixedly matched with the inner buffer spring (48) is formed on the sealing block (49);

the one-way floating ball (50) is provided with a concave spherical groove on one side of the sealing block (49) facing the oil return hole, the spherical groove is provided with the one-way floating ball (50) capable of freely rolling, and the one-way floating ball (50) can prop against the conical sealing surface (46).

10. The cold extrusion apparatus of a master cylinder piston as recited in claim 9, wherein said inner support rod further comprises:

the outer supporting spring (31) is provided with a fixed outer supporting block (51), the outer supporting block (51) can be propped against the supporting disc (28), and the outer supporting block (51) is provided with a pressure sensor in extrusion contact with the sealing cover (19);

the cold extrusion device also comprises a control cabinet which is externally arranged, a control circuit and a controller pressure detector are arranged in the control cabinet and are connected with the controller, a pressure threshold Pa is preset in the controller, the pressure threshold Pa is a range value, and the actual pressure detected by the pressure detector is Pb;

The method for judging whether the closing of the extrusion upper die (4) and the extrusion lower die (1) is abnormal or not by the controller through the fact that the actual pressure is Pb comprises the following steps:

when Pa is larger than Pb, the controller judges that the upper extrusion die (4) and the lower extrusion die (1) are abnormally closed, and the possible reasons are that foreign matters exist;

when Pa is smaller than Pb, the controller judges that the cold extrusion of the extrusion upper die (4) and the extrusion lower die (1) is abnormal, and the possible reason is that no workpiece or the workpiece is abnormal in size;

when Pa is in the range of Pb, the control controller judges that the extrusion upper die (4) and the extrusion lower die (1) are normally closed.