CN112170692B

CN112170692B - Three-step integrated efficient shaft sleeve stamping production method

Info

Publication number: CN112170692B
Application number: CN202010930497.2A
Authority: CN
Inventors: 孔德泉
Original assignee: Sichuan Bozhengda Mechanical Seal Technology Co ltd
Current assignee: Sichuan Bozhengda Mechanical Seal Technology Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2022-10-21
Anticipated expiration: 2040-09-07
Also published as: CN112170692A

Abstract

The invention provides a three-step integrated efficient shaft sleeve stamping production method, which comprises the following steps: s1: placing the shaft sleeve into an end part forming die of an end part punching machine, then placing an end part swelling rubber block into the shaft sleeve, starting the end part punching machine, and performing swelling forming on the upper end of the shaft sleeve through the end part punching machine; s2: placing the shaft sleeve into a middle forming die of a middle punching machine, placing a middle swelling rubber block into the shaft sleeve, starting the middle punching machine, and performing swelling forming on the middle part of the shaft sleeve through the middle punching machine; s3: and placing the shaft sleeve on a punching die of a punching machine, and punching the lower end of the shaft sleeve by the punching machine. The operation is convenient and simple, the forming is efficient, and the working efficiency is improved.

Description

Three-step integrated efficient shaft sleeve stamping production method

Technical Field

The invention relates to the technical field of stamping, in particular to a three-step integrated efficient shaft sleeve stamping production method.

Background

The stamping process is a special process equipment for processing materials (metal or nonmetal) into parts (or semi-finished products) in cold stamping, and is called a cold stamping die (commonly called a cold stamping die). Stamping is a press working method in which a die mounted on a press is used to apply pressure to a material at room temperature to cause separation or plastic deformation of the material, thereby obtaining a desired part.

Disclosure of Invention

The invention aims to at least solve the technical problems in the prior art, and particularly provides a three-step integrated efficient shaft sleeve stamping production method which can quickly finish end swelling, middle swelling and punching processing of a shaft sleeve.

In order to achieve the purpose, the invention provides a three-step integrated efficient shaft sleeve stamping production method, which comprises the following steps of:

s1: placing the shaft sleeve into an end part forming die of an end part punching machine, then placing an end part swelling rubber block into the shaft sleeve, starting the end part punching machine, and performing swelling forming on the upper end of the shaft sleeve through the end part punching machine;

s2: placing the shaft sleeve into a middle forming die of a middle punching machine, placing a middle swelling rubber block into the shaft sleeve, starting the middle punching machine, and performing swelling forming on the middle part of the shaft sleeve through the middle punching machine;

s3: and placing the shaft sleeve on a punching die of a punching machine, and punching the lower end of the shaft sleeve by the punching machine.

In the scheme, the method comprises the following steps: the end portion forming die set in step S1 includes: the upper die component comprises a striking rod, a first upper die fixing plate, an upper die component, a lower die component and a first lower die fixing plate which are arranged in sequence from top to bottom; the lower end of the striking rod penetrates through the first upper die plate and is fixedly connected with the first upper die punch;

the upper die assembly and the lower die assembly are respectively provided with a second through hole, the upper side of the upper die assembly and the lower side of the lower die assembly are respectively provided with a first stamping cavity, the central axes of all the first stamping cavities and the central axes of the second through holes are on the same straight line, the diameter of each first stamping cavity is larger than that of each second through hole, a first upper die core and a first upper feeder are sequentially sleeved in each first stamping cavity of the upper die assembly from outside to inside, a first lower die core and a first lower feeder are sequentially sleeved in each first stamping cavity of the lower die assembly from outside to inside, each first upper die core and each first lower die core respectively comprise a cylinder and an anti-falling column head, each first upper die core anti-falling column head is positioned at the top of each cylinder, each first lower die core column head is positioned at the bottom of each cylinder, and the cylinders of each first upper die core and each first lower die core respectively extend into the corresponding second through holes; the anti-falling column heads are respectively arranged in the corresponding first stamping chambers, and a section of first cavity for the movement of the first upper feeder and/or the first lower feeder is arranged between the anti-falling column heads and the bottoms of the first stamping chambers;

the first upper feeder and the first lower feeder respectively comprise a connecting skirt edge and a sleeve sleeved on the cylinder body, the connecting skirt edge is positioned in the first cavity, and the sleeves of the first upper feeder and the first lower feeder extend into the corresponding second through holes and are used for abutting against the end part of the shaft sleeve; the connecting skirt edge of the first upper feeder is positioned at the top of the sleeve, and the connecting skirt edge of the first lower feeder is positioned at the bottom of the sleeve;

the top of the connecting skirt at the upper end of the first upper feeder is provided with a plurality of first connecting columns, the first connecting columns penetrate through the anti-falling column head of the first upper mold core and are fixedly connected with the first upper mold driver, and the initial position of the connecting skirt at the upper end of the first upper feeder is positioned at the upper part of a first cavity in the upper mold assembly;

the lower side of the upper die assembly is concavely provided with a first upper forming part, the upper side of the lower die assembly is upwards convexly provided with a first lower forming part extending into the first upper forming part, the central axes of the first upper forming part and the first lower forming part are also positioned on the same straight line with the central axis of the second through hole, the first upper forming part and the first lower forming part are combined to form a swelling shape of the shaft sleeve, the bottom end of a first upper die core cylinder is just level with the top of the first upper forming part, and the top of the first lower die core cylinder is just level with the bottom of the first lower forming part;

a first connecting disc is arranged below the first lower die fixing plate, a plurality of second connecting columns are arranged on a connecting skirt edge at the lower end of the first lower conveyer, the lower ends of the plurality of second connecting columns sequentially penetrate through the anti-falling column head of the first lower die core and the first lower die fixing plate to be connected with the first connecting disc, and the first lower conveyer is supported at the upper half part of a first cavity in the lower die assembly through the second connecting columns;

first connection disc below is equipped with a plurality of third guide posts, and is a plurality of third guide post top all passes first connection disc and is connected with first lower mould fixed plate, first connection disc sliding connection is on the third guide post, third guide post bottom is equipped with the first anticreep head that prevents that first connection disc from breaking away from, fill up between first connection disc and the first anticreep head and be equipped with tip canceling release mechanical system.

In the scheme, the method comprises the following steps: step S1 further comprises the steps of:

s1-1: the lower die assembly, the first lower die fixing plate and the first connecting disc are fixedly arranged at the die fixing position of the end part punching machine in an integrated manner;

s1-2: placing the end part molding rubber block into the shaft sleeve in a second through hole of the lower die assembly of the shaft sleeve;

s1-3: starting the end punching machine, pressing the striking rod downwards through the end punching machine, pushing the first upper die driver to move downwards by the striking rod, pushing the first upper feeder to move downwards by the first upper die driver through the first connecting column, and enabling the bottom end of the sleeve of the first upper feeder to extend to the bottom end of the second through hole of the upper die assembly;

s1-4: the end part punching machine drives the hitting rod, the first upper die C, the first upper die fixing plate and the upper die assembly to be pressed downwards, the shaft sleeve is firstly contacted with the first upper feeder, the lower end of the first upper feeder pushes the shaft sleeve to move downwards, the lower end of the shaft sleeve is abutted against the first lower feeder, the shaft sleeve pushes the first lower feeder downwards, the first lower feeder pushes the first connecting disc downwards and compresses the end part resetting mechanism to shorten, the first connecting disc and the first lower feeder move downwards, and the shaft sleeve moves downwards under the action of gravity and falls into a position for accurate punching;

s1-5: the tip punching machine continues to drive and beats pole, first last mould third, first last mould fixed plate and go up the mould subassembly and push down, extrudees the tip shaping through first last mould core and first mould core down and glues the piece and take place deformation, glues the outside swelling axle sleeve of piece through the tip shaping, waits for the axle sleeve to accomplish the shaping, loosens the tip punching machine again.

In the scheme, the method comprises the following steps: the middle forming die in the step S2 includes: the second upper die C, the second upper die fixing plate, the stripper plate, the second lower die and the second lower die fixing plate are arranged from top to bottom in sequence; the second upper die C, the second upper die fixing plate and the stripper plate are fixedly integrated, and the second lower die fixing plate are fixedly integrated;

a second upper mold core is vertically installed on the second upper mold fixing plate, the second upper mold core comprises a column head and a column body part capable of extending into the shaft sleeve, the column head of the second upper mold core is completely immersed into the second upper mold fixing plate and is tightly pressed through the second upper mold core, and the second upper mold fixing plate is fixedly installed with the second upper mold core through a plurality of fasteners; the cylinder of the second upper mold core sequentially passes through the second upper mold fixing plate and the stripper plate and extends out of the lower part of the stripper plate;

the stripper plate and the second upper die fixing plate are arranged at intervals, a first reset mechanism is arranged between the stripper plate and the second upper die fixing plate in a cushioning mode, a plurality of first guide posts are vertically arranged on the stripper plate, vertical sliding grooves are formed in the second upper die C, the top ends of the first guide posts penetrate through the second upper die fixing plate and are inserted into the vertical sliding grooves of the second upper die C, and third anti-stripping heads are arranged at the tops of the first guide posts;

a stamping channel is arranged at the center of the second lower die, a matching block placing hole with the aperture larger than that of the stamping channel is arranged at the upper side of the second lower die, a second stamping cavity with the aperture larger than that of the stamping channel is arranged at the lower side of the second lower die, a swelling forming part is arranged close to the lower part of the matching block placing hole, the central lines of the second stamping cavity, the swelling forming part, the stamping channel and the matching block placing hole are on the same straight line, a lower die matching block is arranged in the matching block placing hole, and a second upper die core cylinder sequentially passes through a second upper die fixing plate, a material return plate and the lower die matching block and extends into the stamping channel; the bottom of the stripper plate and the top of the lower die matching block are arranged into an accommodating cavity matched with the outer contour of the top of the shaft sleeve, the shaft sleeve is pressed in the stamping channel through the stripper plate, and the bottom end of the cylinder body of the second upper die core is flush with the top of the swelling forming part;

a second lower feeding piece and a second lower mold core are sequentially sleeved in the second stamping cavity from top to bottom, the second lower mold core also comprises a column head and a cylinder part which can extend into the shaft sleeve, the cylinder of the second lower mold core faces upwards and extends into the stamping channel from the second stamping cavity, and the second lower mold core is arranged close to the bottom of the second stamping cavity; the second lower feeder comprises a sleeve sleeved on a second lower die core column body, a circle of connecting seat extends outwards from the bottom of the sleeve of the second lower feeder, and the connecting seat can move in the second punching chamber; a connecting piece is arranged at the bottom of the connecting seat, a second disc is arranged below the second lower die fixing plate, the connecting piece penetrates through the second lower die fixing plate and is fixedly connected with the second disc, a plurality of thimbles are uniformly distributed on the second disc, and the upper ends of the thimbles penetrate through the second lower die fixing plate and the second lower die and extend out of the upper part of the second lower die;

the second disc below is equipped with a plurality of second guide posts, and is a plurality of the second guide post top all passes the second disc and is connected with second lower mould fixed plate, second disc sliding connection is on the second guide post, the second guide post bottom is equipped with the second anticreep head that prevents that the second disc from breaking away from, it is equipped with second canceling release mechanical system to fill up between second disc and the second anticreep head.

In the scheme, the method comprises the following steps: step S2 further includes the steps of:

s2-1: putting the shaft sleeve with the formed end part into a stamping channel, and putting the middle forming rubber block into the shaft sleeve;

s2-2: the middle punching machine is started, the middle punching machine drives the second upper die C, the second upper die fixing plate and the stripper plate to press downwards, when the stripper plate moves to the ejector pin, the ejector pin is pushed to move downwards, the second disc is pushed downwards through the ejector pin, and the second disc pushes the second resetting mechanism to compress, so that the second disc moves downwards;

s2-3: after the second disc moves downwards, the second lower conveyer is driven to move downwards under the action of gravity, and the shaft sleeve moves downwards along with the second lower conveyer, so that the top end of the shaft sleeve is completely immersed into the stamping channel of the lower die matching block, and the formed part of the end part of the shaft sleeve is positioned through the accommodating cavity;

s2-4: middle part punching machine drives the second and goes up mould third, mould fixed plate and material returned board and push down, moves to when offsetting with the second lower mould when the material returned board, compresses first canceling release mechanical system, and first guide post top rebound for the cylinder of mold core stretches into the punching press passageway on the second, and mold core and second lower mold core extrusion middle part swelling glue piece on through the second makes the axle sleeve middle part expand outward, waits for the axle sleeve shaping back, unclamps middle part punching machine.

In the scheme, the method comprises the following steps: the punching die in the step S3 includes: the die fixing plate comprises a guide plate, a guide post is vertically arranged on the guide plate, a die fixing plate is slidably mounted on the guide post and can slide up and down along the guide post, a female die with an axis extending forwards and backwards is fixedly mounted in the middle of the front side face of the die fixing plate, one end of the female die is fixed on the die fixing plate, the other end of the female die is freely suspended in the air and used for transversely sleeving a shaft sleeve on the female die, three male dies are arranged on the die fixing plate around the female die, one male die is positioned right above the female die, the rest two male dies are oppositely arranged on the left side and the right side of the female die, and the three male dies are distributed in a regular triangle;

three punching holes for inserting the three male dies are concavely arranged on the female die, the three male dies are all installed on a die fixing plate through a male die installation seat, a through hole for the punching end of the male die to extend out is formed in the male die installation seat, and a punching reset mechanism is arranged between the anti-falling head part of the male die and the male die installation seat in a cushioning mode;

the two convex dies arranged close to the lower side are correspondingly arranged on the front side of the die fixing plate on the guide plate, abutting parts are arranged on the two side faces, close to each other, of the two abutting parts, the two inclined faces are distributed in an inverted eight shape, the anti-falling heads of the convex dies positioned on the lower side are respectively connected onto the inclined faces of the abutting parts in a sliding mode, and when the punch press punches, the two convex dies arranged close to the lower side are pushed to stretch into a punched hole through the inclined faces of the two abutting parts, so that punching is conducted.

In the scheme, the method comprises the following steps: step S3 further includes the steps of:

s3-1: sleeving the unprocessed end of the shaft sleeve on the female die, manually keeping the shaft sleeve fixed, starting a punching machine, pressing the upper end of the male die arranged close to the upper side downwards by the punching machine, and extending the lower end of the male die into the corresponding punched hole to complete punching on the upper side of the shaft sleeve;

s3-2: the punching machine continues to be pressed downwards, so that the die fixing plate moves downwards, the die fixing plate drives the two male dies arranged at the lower side to move downwards, the two male dies arranged at the lower side slide downwards on the abutting piece, the two male dies arranged at the lower side are pushed to extend to punch through the inclined surface on the abutting piece, and the punching at the lower side of the shaft sleeve is completed;

s3-3: and loosening the punching machine, driving the male dies to extend out of the corresponding punched holes through the punching reset mechanism, and enabling the two male dies arranged close to the lower side to slide upwards along the inclined surface of the abutting part to drive the die fixing plate to move upwards and return to the original position.

s1-6: putting the end swelling rubber block into the shaft sleeve, detecting whether the shaft sleeve is concave, and if the end swelling rubber block can slide out of the shaft sleeve, indicating that the shaft sleeve is not concave and forming is successful; otherwise, the end forming fails.

s2-5: putting the middle swelling rubber block into the shaft sleeve, detecting whether the shaft sleeve is concave or not, if the middle swelling rubber block can slide out of the shaft sleeve, indicating that the axis of the shaft sleeve is not concave, and successfully forming; otherwise, the end forming fails.

In the scheme, the method comprises the following steps: the shapes, sizes and materials of the end swelling rubber block and the middle swelling rubber block are the same.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that: can swell end and middle part fast, can also accomplish simultaneously towards three holes to the other end, work efficiency is high, and easy operation improves work efficiency.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of the structure of a punching die according to the present invention;

FIG. 2 is a schematic structural view of a die fixing plate in a punching die;

FIG. 3 is a schematic view showing the structure of a female die in a punching die;

FIG. 4 is a schematic view of the structure of the punch in the punching die;

FIG. 5 is a schematic view of the end forming die of the present invention before it is driven down;

FIG. 6 is a schematic view of the end form die of the present invention after being staked down;

FIG. 7 is a schematic view of the end section mold bottom die assembly of the present invention;

FIG. 8 is a schematic view of the upper mold assembly of the end forming mold of the present invention;

FIG. 9 is a schematic view of the structure of the intermediate mold of the present invention before pressing by the press;

FIG. 10 is a schematic view of the structure of the female mold of the present invention after pressing down by a punch press;

FIG. 11 is a schematic view of the lower die block of the inventive inner mold assembly;

FIG. 12 is a schematic view of a second lower die of the intermediate molding die of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

The invention provides a three-step integrated efficient shaft sleeve stamping production method which comprises the following steps

Wherein the end portion forming die, the middle portion forming die and the punching die can be mounted on the same punch.

As shown in fig. 1 to 12, the end portion forming mold described in step S1 includes: the device comprises a striking rod 201, a first upper die carrier 202, a first upper die fixing plate 203, an upper die assembly 204, a lower die assembly 205 and a first lower die fixing plate 206 which are arranged in sequence from top to bottom; the lower die component comprises a striking rod 201, a first upper die carrier 202, a first upper die fixing plate 203 and an upper die component 204 which are fixedly integrated, wherein the lower die component 205 and a first lower die fixing plate 206 are fixedly integrated, a first through hole is vertically formed in the first upper die fixing plate 203, a first upper die driver 210 is connected in the first through hole in a sliding mode, and the lower end of the striking rod 201 penetrates through the first upper die carrier 202 and is fixedly connected with the first upper die driver 210;

the upper die assembly 204 and the lower die assembly 205 are both provided with second through holes 20b, the upper side of the upper die assembly 204 and the lower side of the lower die assembly 205 are respectively provided with first stamping chambers a, the central axes of all the first stamping chambers a and the central axes of the second through holes 20b are on the same straight line, the diameters of the first stamping chambers a are larger than those of the second through holes, a first upper die core 211 and a first upper feeder 212 are sequentially sleeved in the first stamping chamber a of the upper die assembly 204 from outside to inside, a first lower die core 214 and a first lower feeder 216 are sequentially sleeved in the first stamping chamber a of the lower die assembly 205 from outside to inside, the first upper die core 211 and the first lower die core 214 both comprise columns and anti-falling column heads, the anti-falling column heads of the first upper die core 211 are positioned at the tops of the columns, the anti-falling column heads of the first lower die core 214 are positioned at the bottoms of the columns, and the columns of the first upper die core 211 and the first lower die core 214 both extend into the corresponding second through holes 20 b; the anti-drop column heads are respectively arranged in the corresponding first stamping chambers a, and a section of first cavity 215 for the first up-sending unit 212 and/or the first down-sending unit 216 to move is arranged between the anti-drop column heads and the bottoms of the first stamping chambers a;

the first upper feeder 212 and the first lower feeder 216 both comprise a connecting skirt and a sleeve sleeved outside the cylinder, the connecting skirt is positioned in the first cavity 215, and the sleeves of the first upper feeder 212 and the first lower feeder 216 both extend into the corresponding second through holes 20b and are used for abutting against the end part of the shaft sleeve; the connecting skirt of the first up-sending device 212 is positioned at the top of the sleeve, and the connecting skirt of the first down-sending device 216 is positioned at the bottom of the sleeve;

a plurality of first connecting columns 210a are arranged at the top of the connecting skirt at the upper end of the first upper feeder 212, and the first connecting columns 210a penetrate through the anti-falling column head of the first upper mold core 211 to be fixedly connected with the first upper mold feeder 210, so that the initial position of the connecting skirt at the upper end of the first upper feeder 212 is positioned at the upper part of a first cavity 215 in the upper mold assembly 204;

a first upper forming part 204c is concavely arranged on the lower side of the upper die assembly 204, a first lower forming part 205a extending into the first upper forming part 204c is convexly arranged on the upper side of the lower die assembly 205 upwards, the central axes of the first upper forming part 204c and the first lower forming part 205a are also on the same straight line with the central axis of the second through hole 20b, the swelling shape of the shaft sleeve is formed by combining the first upper forming part 204c and the first lower forming part 205a, the bottom end of the column of the first upper die core 211 is just flush with the top of the first upper forming part 204c, and the top of the column of the first lower die core 214 is just flush with the bottom of the first lower forming part 205 a;

a first connecting disc 207 is arranged below the first lower die fixing plate 206, a plurality of second connecting columns 2013 are arranged on the connecting skirt at the lower end of the first lower conveyer 216, the lower ends of the plurality of second connecting columns 2013 sequentially penetrate through the anti-falling column heads of the first lower die core 214 and the first lower die fixing plate 206 to be connected with the first connecting disc 207, and the first lower conveyer 216 is supported at the upper half part of the first cavity 215 in the lower die assembly 205 through the second connecting columns 2013;

a plurality of third guide columns 208 are arranged below the first connecting disc 207, the top ends of the third guide columns 208 penetrate through the first connecting disc 207 and are connected with the first lower die fixing plate 206, the first connecting disc 207 is connected to the third guide columns 208 in a sliding mode, first anti-falling heads 207a for preventing the first connecting disc 207 from falling off are arranged at the bottom ends of the third guide columns 208, an end portion resetting mechanism is arranged between the first connecting disc 207 and the first anti-falling heads 207a in a cushioning mode, and the end portion resetting mechanism is a rubber tube sleeved outside the third guide columns 208.

Preferably, the top of the lower die assembly 205 is provided with a ring of raised bosses 205b around the lower flare so that a gap is formed between the top edge of the lower die assembly 205 and the bottom of the upper die assembly 204.

Preferably, the first punching chamber a of the lower mold assembly 205 is provided with a clamping mechanism, and the anti-drop column heads of the first lower mold core 214 are clamped at the bottom of the punching chamber 20a of the lower mold assembly 205 through the clamping mechanism.

Preferably, the clamping mechanism comprises a positioning ring 217 which is concave outwards along the stamping chamber, and a positioning edge which is convex outwards at the end part of the anti-drop column head and matched with the positioning ring 217.

Preferably, the top end of the guide rod 208 is screwed to the bottom of the lower mold fixing plate 206.

Preferably, the cylinder of the first upper mold core 211 is shorter than the cylinder of the first lower mold core 214.

Wherein, step S1 further comprises the following steps:

s1-1: the lower die assembly 205, the first lower die fixing plate 206 and the first connecting disc 207 are fixedly and integrally mounted at the die fixing position of the end punching machine;

s1-2: placing the end part molding rubber block into the shaft sleeve in the second through hole 20b of the shaft sleeve lower die assembly 205;

s1-3: starting the end punching machine, pressing the striking rod 201 downwards through the end punching machine, wherein the striking rod 201 pushes the first upper die punch 210 to move downwards, and the first upper die punch 210 pushes the first upper feeder 212 to move downwards through the first connecting column 210a, so that the bottom end of the sleeve of the first upper feeder 212 extends to the bottom end of the second through hole 20b of the upper die assembly 204;

s1-4: the striking rod 201, the first upper die carrier 202, the first upper die fixing plate 203 and the upper die assembly 204 are driven to press downwards by the end punch, the shaft sleeve is firstly contacted with the first upper feeder 212, the lower end of the first upper feeder 212 pushes the shaft sleeve to move downwards, the lower end of the shaft sleeve is abutted against the first lower feeder 216, the shaft sleeve pushes the first lower feeder 216 downwards, the first lower feeder 216 pushes the first connecting disc 207 downwards and compresses the end resetting mechanism to shorten, the first connecting disc 207 and the first lower feeder 216 move downwards, and the shaft sleeve moves downwards under the action of gravity and falls into a position for correct punching;

s1-5: the end part punching machine continuously drives the hitting rod 201, the first upper mold core 202, the first upper mold fixing plate 203 and the upper mold assembly 204 to be pressed downwards, the end part forming rubber block is pressed downwards through the first upper mold core 211 and the first lower mold core 214 to be deformed, the end part forming rubber block outwards swells a shaft sleeve, the shaft sleeve is waited to be formed, and then the end part punching machine is loosened;

s1-6: putting the end swelling rubber block into the shaft sleeve, detecting whether the shaft sleeve is concave or not, if the end swelling rubber block can slide out of the shaft sleeve, indicating that the axis of the shaft sleeve is not concave, and successfully forming; otherwise, the end forming fails.

Wherein, the middle part forming die in step S2 includes: a second upper die holder 301, a second upper die fixing plate 302, a stripper plate 305, a second lower die 307 and a second lower die fixing plate 309 which are arranged in sequence from top to bottom; the second upper die holder 301, the second upper die fixing plate 302 and the stripper plate 305 are fixed and formed into a whole, and the second lower die 307 and the second lower die fixing plate 309 are fixed and formed into a whole;

a second upper mold core 303 is vertically mounted on the second upper mold fixing plate 302, the second upper mold core 303 comprises a column head and a column part capable of extending into the shaft sleeve, the column head of the second upper mold core 303 is completely sunk into the second upper mold fixing plate 302 and is pressed by a second upper mold insert 301, and the second upper mold fixing plate 302 is fixedly mounted with the second upper mold insert 301 through a plurality of fasteners 301 b; the cylinder of the second upper mold core 303 sequentially passes through the second upper mold fixing plate 302 and the stripper plate 305 and extends out to the lower part of the stripper plate 305;

the stripper plate 305 and the second upper die fixing plate 302 are arranged at intervals, a first reset mechanism 304a is arranged between the stripper plate 305 and the second upper die fixing plate 302 in a cushioning manner, a plurality of first guide posts 304 are vertically mounted on the stripper plate 305, a vertical sliding groove 301a is formed in the second upper die holder 301, the top end of each first guide post 304 penetrates through the second upper die fixing plate 302 and is inserted into the vertical sliding groove 301a of the second upper die holder 301, and the top of each first guide post 304 is provided with a third anti-falling head;

a stamping channel 307c is arranged at the center of the second lower die 307, a matching block placing hole with the aperture larger than that of the stamping channel is arranged at the upper side of the second lower die 307, a second stamping cavity 307d with the aperture larger than that of the stamping channel is arranged at the lower side of the second lower die 307, a swelling forming part 307b is arranged close to the lower side of the matching block placing hole, the central lines of the second stamping cavity 307d, the swelling forming part 307b, the stamping channel 307c and the matching block placing hole are on the same straight line, a lower die matching block 306 is arranged in the matching block placing hole, and a cylinder of the second upper die core 303 sequentially passes through the second upper die fixing plate 302, the stripper plate 305 and the lower die matching block 306 and extends into the stamping channel 307 c; the bottom of the material discharging plate 305 and the top of the lower die matching block 306 are provided with accommodating cavities matched with the outer contour of the top of the shaft sleeve, the shaft sleeve is pressed in the stamping channel 307c through the material discharging plate 305, and the bottom end of the column of the second upper die core 303 is flush with the top of the swelling forming part 307 b;

a second lower feeding piece 312 and a second lower mold core 308 are sequentially sleeved in the second stamping cavity 307d from top to bottom, the second lower mold core 308 also comprises a column head and a column body part which can extend into the shaft sleeve, the column body of the second lower mold core 308 faces upwards and extends into the stamping channel 307c from the second stamping cavity 307d, and the second lower mold core 308 is arranged close to the bottom of the second stamping cavity 307 d; the second feeding unit 312 comprises a sleeve sleeved on the column of the second lower mold core 308, a ring of connecting seats extends outwards from the bottom of the sleeve of the second feeding unit 312, and the connecting seats can move in the second stamping cavity 307 d; a connecting piece 312a is arranged at the bottom of the connecting seat, a second disc 310 is arranged below the second lower die fixing plate 309, the connecting piece 312a penetrates through the second lower die fixing plate 309 and is fixedly connected with the second disc 310, a plurality of ejector pins 310a are uniformly distributed on the second disc 310, and the upper ends of the ejector pins 310a penetrate through the second lower die fixing plate 309 and the second lower die 307 and extend out of the upper part of the second lower die 307;

a plurality of second guide posts 311 are arranged below the second disc 310, the top ends of the second guide posts 311 penetrate through the second disc 310 to be connected with the second lower die fixing plate 309, the second disc 310 is connected to the second guide posts 311 in a sliding mode, second anti-falling heads for preventing the second disc 310 from falling off are arranged at the bottom ends of the second guide posts 311, and a second reset mechanism 313 is arranged between the second disc 310 and the second anti-falling heads in a cushioning mode.

Preferably, the middle of the top end of the second lower mold 307 is provided with a ring-shaped boss, so that a gap is formed between the top edge of the second lower mold 307 and the bottom of the second upper mold fixing plate 302.

Preferably, the lower module 306 is a circular truncated cone with a large top and a small bottom, and the module placement hole 307a is also a circular truncated cone matching with the lower module 306.

Preferably, the cylinder of the second upper mold core 303 is longer than the cylinder of the second lower mold core 308.

Preferably, the first return mechanism 304a is tubular and fits around the first guide rod 304.

Preferably, the first guide rod 304 is a bolt, the bottom end of the first guide rod 304 is in threaded connection with the stripper plate 305, and the vertical sliding groove 301a is a concave pit formed in the upper surface of the upper die holder 301.

Preferably, the first and second reset mechanisms 304a and 3013 are rubber tubes.

Wherein, step S2 also includes the following steps:

s2-1: putting the shaft sleeve with the formed end part into a stamping channel 307c, and putting the middle forming rubber block into the shaft sleeve;

s2-2: starting the middle punch, the middle punch drives the second upper die holder 301, the second upper die fixing plate 302 and the stripper plate 305 to press downwards, when the stripper plate 305 moves to the ejector pin 310a, the ejector pin 310a is pushed to move downwards, the second disc 310 is pushed downwards through the ejector pin 310a, the second disc 310 pushes the second resetting mechanism 313 to compress, and thus the second disc 310 moves downwards;

s2-3: after the second disc 310 moves downwards, the second sending unit 312 is driven to move downwards under the action of gravity, and the shaft sleeve moves downwards along with the second sending unit 312, so that the top end of the shaft sleeve is completely sunk into the stamping channel 307c of the lower die matching block 306, and the part formed at the end part of the shaft sleeve is positioned through the accommodating cavity;

s2-4: the middle punching machine drives the second upper die carrier 301, the second upper die fixing plate 302 and the stripper plate 305 to press downwards, when the stripper plate 305 moves to abut against the second lower die 307, the first reset mechanism 304a is compressed, the top end of the first guide column 304 moves upwards, so that the column body of the second upper die core 303 extends into the punching channel 307c, the middle swelling rubber block is extruded through the second upper die core 303 and the second lower die core 308, the middle part of the shaft sleeve expands outwards, and after the shaft sleeve is formed, the middle punching machine is released;

Wherein, the punching die in step S3 includes: the die fixing plate comprises a guide plate 102, a guide column 109 is vertically arranged on the guide plate 102, a die fixing plate 101 is arranged on the guide column 109 in a sliding mode, the die fixing plate 101 can slide up and down along the guide column 109, a female die 106 with an axis extending forwards and backwards is fixedly arranged in the middle of the front side face of the die fixing plate 101, one end of the female die 106 is fixed on the die fixing plate 101, the other end of the female die 106 is freely suspended and used for transversely sleeving a shaft sleeve on the female die 106, three male dies 107 are arranged on the die fixing plate 101 around the female die 106, one male die 107 is located right above the female die 106, the rest two male dies are oppositely arranged on the left side and the right side of the female die 106, and the three male dies 107 are distributed in a regular triangle;

the female die 106 is concavely provided with three punched holes for inserting three male dies 107, the three male dies 107 are all arranged on the die fixing plate 101 through a male die mounting seat 104, the male die mounting seat 104 is provided with a through hole for extending a punched end of the male die 107, and a punched hole resetting mechanism 108 is arranged between an anti-falling head 107a of the male die 107 and the male die mounting seat 104 in a cushioning manner;

the two male dies 107 arranged close to the lower side and corresponding to the front side of the die fixing plate 101 on the guide plate 102 are both provided with abutting parts 103, the side surfaces of the two abutting parts 103 close to each other are inclined surfaces, the two inclined surfaces are distributed in an inverted eight shape, the anti-falling heads 107a of the male dies 107 positioned at the lower side are respectively connected to the inclined surfaces 103a of the abutting parts 103 in a sliding manner, and when the punch presses, the two male dies 107 arranged close to the lower side are pushed to extend into the punched holes through the inclined surfaces of the two abutting parts 103 to punch holes.

Preferably, the die fixing plate 101 is further provided with a positioning mounting seat 105 for mounting the female die 106, and the die fixing plate 101 is provided with a bayonet 101a for the positioning mounting seat 105 to be clamped in.

An anti-rotation structure is arranged between the positioning installation seat 105 and the bayonet 101a.

And a circle of positioning bosses 106b are arranged at the tail end of the female die 106.

The supporting member 103 is a cone with an upward cone tip.

The female die 106 is a hollow cylinder.

A pressure spring is arranged between the die fixing plate 101 and the guide plate 102.

The punch mounting seat 104 is semicircular, and the straight side of the punch mounting seat 104 is far away from the female die 106.

Step S3 further includes the steps of:

s3-1: sleeving the unprocessed end of the shaft sleeve on the female die 106, manually keeping the shaft sleeve fixed, starting a punching machine, pressing the upper end of the male die 107 arranged close to the upper side downwards by the punching machine, and extending the lower end of the male die 107 into the corresponding punched hole to finish punching the upper side of the shaft sleeve;

s3-2: the punching machine continues to be pressed downwards, so that the die fixing plate 101 moves downwards, the die fixing plate 101 drives the two male dies 107 arranged on the lower side to move downwards, the two male dies 107 arranged on the lower side slide downwards on the abutting piece 103, the two male dies 107 arranged on the lower side are pushed by the inclined surface on the abutting piece 103 to extend to punch holes, and punching on the lower side of the shaft sleeve is completed;

s3-3: and (3) loosening the punching machine, driving the male dies 107 to extend out of the corresponding punched holes through the punching reset mechanism 108, and enabling the two male dies 107 arranged on the lower side to slide upwards along the inclined surfaces of the abutting pieces 103 to drive the die fixing plate 101 to move upwards and return to the original position.

Preferably, the swollen rubber blocks at the end parts and the swollen rubber blocks at the middle parts have the same shape, size and material.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A three-step integrated efficient shaft sleeve stamping production method is characterized in that: comprises the following steps

S1: placing the shaft sleeve into an end part forming die of an end part punching machine, then placing an end part swelling forming rubber block into the shaft sleeve, starting the end part punching machine, and performing swelling forming on the upper end of the shaft sleeve through the end part punching machine;

s2: placing the shaft sleeve into a middle forming die of a middle punching machine, then placing a middle swelling forming rubber block into the shaft sleeve, starting the middle punching machine, and performing swelling forming on the middle part of the shaft sleeve through the middle punching machine;

s3: placing the shaft sleeve on a punching die of a punching machine, and punching the lower end of the shaft sleeve by the punching machine;

the end portion forming die set forth in step S1 includes: the device comprises a striking rod (201), a first upper die carrier (202), a first upper die fixing plate (203), an upper die assembly (204), a lower die assembly (205) and a first lower die fixing plate (206) which are arranged from top to bottom in sequence; the punching rod (201), the first upper die holder (202), the first upper die fixing plate (203) and the upper die assembly (204) are fixedly integrated, the lower die assembly (205) and the first lower die fixing plate (206) are fixedly integrated, a first through hole is vertically formed in the first upper die fixing plate (203), a first upper die punch (210) is connected in the first through hole in a sliding mode, and the lower end of the punching rod (201) penetrates through the first upper die holder (202) to be fixedly connected with the first upper die punch (210);

the anti-dropping device is characterized in that second through holes (b) are formed in the upper die assembly (204) and the lower die assembly (205), first stamping cavities (a) are formed in the upper side of the upper die assembly (204) and the lower side of the lower die assembly (205) respectively, the central axes of all the first stamping cavities (a) and the central axes of the second through holes (b) are on the same straight line, the diameter of each first stamping cavity (a) is larger than that of each second through hole, a first upper feeding piece (212) and a first upper die core (211) are sequentially sleeved in the first stamping cavity (a) of the upper die assembly (204) from outside to inside, a first lower feeding piece (216) and a first lower die core (214) are sequentially sleeved in the first stamping cavity (a) of the lower die assembly (205) from outside to inside, each first upper die core (211) and each first lower die core (214) comprise a cylinder and an anti-dropping body, the head of each first upper die core (211) is located at the top of each cylinder, the first lower die core (214) is located at the bottom of each cylinder, and the anti-dropping head of each first upper die core (211) and each second die core (214) extend into the corresponding to the corresponding second through hole (214 b); the anti-drop column heads are respectively arranged in the corresponding first stamping chambers (a), and a section of first cavity (215) for the first upper feeder (212) and/or the first lower feeder (216) to move is arranged between the anti-drop column heads and the bottoms of the first stamping chambers (a);

the first upper feeder (212) and the first lower feeder (216) comprise connecting skirts and sleeves sleeved on the cylinder body, the connecting skirts are located in the first cavity (215), and the sleeves of the first upper feeder (212) and the first lower feeder (216) extend into the corresponding second through holes (b) and are used for abutting against the end portions of the shaft sleeves; the connecting skirt edge of the first upper feeder (212) is positioned at the top of the sleeve, and the connecting skirt edge of the first lower feeder (216) is positioned at the bottom of the sleeve;

the top of the connecting skirt at the upper end of the first upper feeder (212) is provided with a plurality of first connecting columns (210 a), the first connecting columns (210 a) penetrate through the anti-falling column head of the first upper mold core (211) to be fixedly connected with the first upper mold feeder (210), and the initial position of the connecting skirt at the upper end of the first upper feeder (212) is located at the upper part of a first cavity (215) in the upper mold assembly (204);

a first upper forming part (204 c) is concavely arranged on the lower side of the upper die component (204), a first lower forming part (205 a) extending into the first upper forming part (204 c) is convexly arranged on the upper side of the lower die component (205) upwards, the central axes of the first upper forming part (204 c) and the first lower forming part (205 a) are also on the same straight line with the central axis of the second through hole (b), the swelling shape of the shaft sleeve is formed by combining the first upper forming part (204 c) and the first lower forming part (205 a), the bottom end of the cylinder of the first upper die core (211) is just flush with the top of the first upper forming part (204 c), and the top of the first lower die core (214) is just flush with the bottom of the first lower forming part (205 a);

a first connecting disc (207) is arranged below the first lower die fixing plate (206), a plurality of second connecting columns (213) are arranged on a connecting skirt edge at the lower end of the first lower conveyer (216), the lower ends of the plurality of second connecting columns (213) sequentially penetrate through the anti-falling column heads of the first lower die cores (214) and the first lower die fixing plate (206) to be connected with the first connecting disc (207), and the first lower conveyer (216) is supported at the upper half part of a first cavity (215) in the lower die assembly (205) through the second connecting columns (213);

a plurality of third guide posts (208) are arranged below the first connecting disc (207), the top ends of the third guide posts (208) penetrate through the first connecting disc (207) to be connected with the first lower die fixing plate (206), the first connecting disc (207) is connected to the third guide posts (208) in a sliding mode, first anti-falling heads () for preventing the first connecting disc (207) from falling off are arranged at the bottom ends of the third guide posts (208), and an end part resetting mechanism is arranged between the first connecting disc (207) and the first anti-falling heads ();

step S1 further comprises the steps of:

s1-1: the method comprises the steps that a striking rod (201), a first upper die set (202), a first upper die fixing plate (203) and an upper die assembly (204) are fixedly formed and integrally installed at a punching position of an end punching machine, and a lower die assembly (205), a first lower die fixing plate (206) and a first connecting disc (207) are fixedly formed and integrally installed at a die fixing position of the end punching machine;

s1-2: the shaft sleeve is placed into a second through hole (b) of the lower die assembly (205), and then the end swelling forming rubber block is placed into the shaft sleeve;

s1-3: starting the end punching machine, pressing the striking rod (201) downwards through the end punching machine, wherein the striking rod (201) pushes the first upper die punch (210) to move downwards, and the first upper die punch (210) pushes the first upper feeder (212) to move downwards through the first connecting column (210 a), so that the bottom end of the sleeve of the first upper feeder (212) extends to the bottom end of the second through hole (b) of the upper die assembly (204);

s1-4: the end punching machine drives the knock rod (201), the first upper die carrier (202), the first upper die fixing plate (203) and the upper die assembly (204) to press downwards, the shaft sleeve is firstly contacted with the first upper feeder (212), the lower end of the first upper feeder (212) pushes the shaft sleeve to move downwards, the lower end of the shaft sleeve is abutted against the first lower feeder (216), the shaft sleeve pushes the first lower feeder (216) downwards, the first lower feeder (216) pushes the first connecting disc (207) downwards and compresses the end resetting mechanism to shorten, the first connecting disc (207) and the first lower feeder (216) move downwards, and the shaft sleeve moves downwards under the action of gravity and falls into a correct punching position;

s1-5: the tip punching machine continues to drive and beats pole (201), first last mould third (202), first last mould fixed plate (203) and go up mould subassembly (204) and push down, extrudees tip swelling shaping through first last mould core (211) and first mould core (214) downwards and glues the piece and take place deformation, glues the outside swelling axle sleeve of piece through tip swelling shaping, waits for the axle sleeve to accomplish the shaping, loosens the tip punching machine again.

2. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 1, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: the middle forming die in the step S2 includes: the second upper die carrier (301), the second upper die fixing plate (302), the stripper plate (305), the second lower die (307) and the second lower die fixing plate (309) are sequentially arranged from top to bottom; the second upper die set (301), the second upper die fixing plate (302) and the stripper plate (305) are fixedly formed into a whole, and the second lower die (307) and the second lower die fixing plate (309) are fixedly formed into a whole;

a second upper mold core (303) is vertically arranged on the second upper mold fixing plate (302), the second upper mold core (303) comprises a column head and a column body part capable of extending into the shaft sleeve, the column head of the second upper mold core (303) is completely sunk into the second upper mold fixing plate (302) and is tightly pressed through the second upper mold core (301), and the second upper mold fixing plate (302) is fixedly arranged with the second upper mold core (301) through a plurality of fasteners (301 b); the cylinder of the second upper mold core (303) sequentially passes through the second upper mold fixing plate (302) and the stripper plate (305) and extends out of the lower part of the stripper plate (305);

the stripper plate (305) and the second upper die fixing plate (302) are arranged at intervals, a first reset mechanism (304 a) is arranged between the stripper plate (305) and the second upper die fixing plate (302) in a cushioning mode, a plurality of first guide posts (304) are vertically installed on the stripper plate (305), vertical sliding grooves (301 a) are formed in the second upper die retainer (301), the top ends of the first guide posts (304) penetrate through the second upper die fixing plate (302) to be inserted into the vertical sliding grooves (301 a) of the second upper die retainer (301), and third anti-stripping heads are arranged at the tops of the first guide posts (304);

a stamping channel (307 c) is arranged at the center of the second lower die (307), a matching block placing hole with the diameter larger than that of the stamping channel is arranged at the upper side of the second lower die (307), a second stamping cavity (307 d) with the diameter larger than that of the stamping channel is arranged at the lower side of the second lower die, a swelling forming part (307 b) is arranged close to the lower side of the matching block placing hole, the center lines of the second stamping cavity (307 d), the swelling forming part (307 b), the stamping channel (307 c) and the matching block placing hole are on the same straight line, a lower die matching block (306) is arranged in the matching block placing hole, and the cylinder of the second upper die core (303) sequentially penetrates through the second upper die fixing plate (302), the stripper plate (305) and the lower die matching block (306) to extend into the stamping channel (307 c); the bottom of the stripper plate (305) and the top of the lower die matching block (306) are provided with containing cavities matched with the outer contour of the top of the shaft sleeve, the shaft sleeve is pressed in a stamping channel (307 c) through the stripper plate (305), and the bottom end of the cylinder of the second upper die core (303) is flush with the top of the swelling forming part (307 b);

a second lower feeding piece (312) and a second lower mold core (308) are sequentially sleeved in the second stamping cavity (307 d) from top to bottom, the second lower mold core (308) also comprises a column head and a column body part capable of extending into the shaft sleeve, the column body of the second lower mold core (308) faces upwards and extends into the stamping channel (307 c) from the second stamping cavity (307 d), and the second lower mold core (308) is arranged close to the bottom of the second stamping cavity (307 d); the second feeding device (312) comprises a sleeve sleeved on the column body of the second lower mold core (308), the bottom of the sleeve of the second feeding device (312) extends outwards to form a circle of connecting seats, and the connecting seats can move in a second stamping cavity (307 d); a connecting piece (312 a) is arranged at the bottom of the connecting seat, a second disc (310) is arranged below the second lower die fixing plate (309), the connecting piece (312 a) penetrates through the second lower die fixing plate (309) to be fixedly connected with the second disc (310), a plurality of ejector pins (310 a) are uniformly distributed on the second disc (310), and the upper ends of the ejector pins (310 a) penetrate through the second lower die fixing plate (309) and the second lower die (307) and extend out of the upper side of the second lower die (307);

second disc (310) below is equipped with a plurality of second guide post (311), and is a plurality of second guide post (311) top all passes second disc (310) and is connected with second lower mould fixed plate (309), second disc (310) sliding connection is on second guide post (311), second guide post (311) bottom is equipped with the second anticreep head that prevents second disc (310) and break away from, the pad is equipped with second canceling release mechanical system (313) between second disc (310) and the second anticreep head.

3. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 2, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: step S2 further includes the steps of:

s2-1: putting the shaft sleeve with the formed end part into a stamping channel (307 c), and putting a middle swelling forming rubber block into the shaft sleeve;

s2-2: starting a middle punching machine, wherein the middle punching machine drives a second upper die carrier (301), a second upper die fixing plate (302) and a stripper plate (305) to press downwards, when the stripper plate (305) moves to an ejector pin (310 a), the ejector pin (310 a) is pushed to move downwards, a second disc (310) is pushed downwards through the ejector pin (310 a), and the second disc (310) pushes a second resetting mechanism (313) to compress, so that the second disc (310) moves downwards;

s2-3: after the second disc (310) moves downwards, the second lower conveyer (312) is driven to move downwards under the action of gravity, and the shaft sleeve moves downwards along with the second lower conveyer (312), so that the top end of the shaft sleeve is completely immersed into a stamping channel (307 c) of the lower die matching block (306), and the formed part of the end part of the shaft sleeve is positioned through the accommodating cavity;

s2-4: middle part punching machine drives second upper die third (301), second upper die fixed plate (302) and material returning plate (305) push down, when material returning plate (305) move to offset with second lower mould (307), compress first canceling release mechanical system (304 a), first guide post (304) top is the rebound, make the cylinder of mold core (303) on the second stretch into in punching press passageway (307 c), mold core (303) and second lower mold core (308) extrusion middle part swelling shaping glue piece on through the second, make the axle sleeve middle part expand outward, wait for the axle sleeve shaping back, loosen the middle part punching machine.

4. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 1, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: the punching die in the step S3 includes: the die comprises a guide plate (102), a guide column (109) is vertically arranged on the guide plate (102), a die fixing plate (101) is arranged on the guide column (109) in a sliding mode, the die fixing plate (101) can slide up and down along the guide column (109), a female die (106) extending front and back along an axis is fixedly arranged in the middle of the front side face of the die fixing plate (101), one end of the female die (106) is fixed on the die fixing plate (101), the other end of the female die is freely suspended and used for transversely sleeving a shaft sleeve on the female die (106), three male dies (107) are arranged on the die fixing plate (101) around the female die (106), one male die (107) is located right above the female die (106), the rest two male dies are arranged on the left side and the right side of the female die (106) oppositely, and the three male dies (107) are distributed in a regular triangle shape;

three punched holes (106 a) for inserting three male dies (107) are concavely arranged on the female die (106), the three male dies (107) are all installed on the die fixing plate (101) through a male die installation seat (104), a through hole for the punching end of the male die (107) to extend out is formed in the male die installation seat (104), and a punching reset mechanism (108) is arranged between the anti-falling head part (107 a) of the male die (107) and the male die installation seat (104) in a cushioning mode;

the front side of the die fixing plate (101) on the guide plate (102) is provided with two convex dies (107) correspondingly arranged close to the lower side, the two convex dies (107) are provided with abutting pieces (103), the side faces of the two abutting pieces (103) close to each other are inclined faces, the two inclined faces are distributed in an inverted eight shape, the anti-falling heads (107 a) of the convex dies (107) positioned on the lower side are respectively connected to the inclined faces (103 a) of the abutting pieces (103) in a sliding mode, and when the punch presses the convex dies, the two convex dies (107) arranged close to the lower side are pushed to extend into the punched holes (106 a) through the inclined faces of the two abutting pieces (103) to punch the holes.

5. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 4, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: step S3 further includes the steps of:

s3-1: sleeving the unprocessed end of the shaft sleeve on a female die (106), manually keeping the shaft sleeve fixed, starting a punching machine, pressing the upper end of a male die (107) arranged close to the upper side downwards by the punching machine, and extending the lower end of the male die (107) into a corresponding punched hole (106 a) to complete punching on the upper side of the shaft sleeve;

s3-2: the punching machine is continuously pressed downwards, so that the die fixing plate (101) moves downwards, the die fixing plate (101) drives the two male dies (107) arranged close to the lower side to move downwards, the two male dies (107) arranged close to the lower side slide downwards on the abutting piece (103), the two male dies (107) arranged close to the lower side are pushed to eject upwards through the inclined surface on the abutting piece (103), and extend into the corresponding punched holes (106 a), and the punched holes on the lower side of the shaft sleeve are completed;

s3-3: and (3) loosening the punching machine, driving the male dies (107) to extend out of corresponding punched holes through the punching reset mechanism (108), enabling the two male dies (107) arranged close to the lower side to slide upwards along the inclined surfaces of the abutting pieces (103), and driving the die fixing plate (101) to move upwards to return to the original position.

6. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 1, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: step S1 further comprises the steps of:

s1-6: putting the end swelling forming rubber block into the shaft sleeve, detecting whether the shaft sleeve is concave or not, if the end swelling forming rubber block can slide out of the shaft sleeve, indicating that the axis of the shaft sleeve is not concave, and forming successfully; otherwise, the end forming fails.

7. The three-step integrated high-efficiency shaft sleeve stamping production method as claimed in claim 3, wherein the three-step integrated high-efficiency shaft sleeve stamping production method comprises the following steps: step S2 further includes the steps of:

s2-5: putting the middle swelling forming rubber block into the shaft sleeve, detecting whether the shaft sleeve is concave, and if the middle swelling forming rubber block can slide out of the shaft sleeve, indicating that the shaft sleeve is not concave and forming is successful; otherwise, the end forming fails.

8. The three-step integrated efficient shaft sleeve stamping production method as claimed in claim 1, wherein the three-step integrated efficient shaft sleeve stamping production method comprises the following steps: the shape, size and material of the end swelling molding rubber block and the middle swelling molding rubber block are the same.