CN111842645A - Trimming device and trimming method for thin-wall deep-drawing cylindrical part - Google Patents

Abstract

The invention relates to the field of die manufacturing of a cylindrical part, in particular to a trimming device and a trimming method for a thin-wall deep-drawing cylindrical part, which are used for thin-wall deep-drawing, and comprise an upper die holder and a lower die holder, wherein a cylindrical part trimming mechanism is arranged between the upper die holder and the lower die holder, the cylindrical part trimming mechanism comprises a female die, a core fixing male die, a buffer spring, a blanking connecting sleeve and a cylindrical knife, a beveling supporting surface is formed at the upper end of an inner hole of the female die, the blanking connecting sleeve is arranged at the outer side of the core fixing male die, the upper end of the blanking connecting sleeve is connected with the upper die holder through the buffer spring, the lower end of the blanking connecting sleeve is connected with the cylindrical knife, the distance from the knife edge of the cylindrical knife to the axis of the blanking connecting sleeve is not less than half of the width of the inner hole of the female die, the cylindrical, the invention has low cost, no trimming and burr, high efficiency and can be connected with the progressive die in series with the preorder punching process.

Description

Edge trimming device and edge trimming method for thin-walled deep drawing cylindrical parts

technical field

The invention relates to the field of mold making of cylindrical parts, in particular to a trimming device and trimming method for thin-wall drawing cylindrical parts.

Background technique

The deep drawing process is a commonly used processing method of pressing a flat blank into various open hollow workpieces by using a die. The amount, that is, the residual material in the circumference, is cut off after the deep drawing is completed. The common trimming process is mainly organic processing or rotary cutting method, but this method is used to remove thin-walled deep drawing cylindrical parts. When trimming the allowance, it is easy to cause deformation and high cost. In addition, generally in the stamping die, the inclined wedge slider mechanism is used to convert the vertical movement of the die into horizontal linear movement, and then realize the circumference of the cylindrical part. Removal of residual material, however, this method not only has complex device structure, but also has poor trimming quality. Chinese patent CN103949527B discloses trimming device and method for cylindrical workpieces. The trimming device for cylindrical workpieces includes concave die, The punch, the cam, the cam drive mechanism, the eccentric reset mechanism and the follow-up mechanism of the die. The die is set above the punch. The axial section of the die is H-shaped. The upper space of the die is provided with a cam. A cam parking groove is arranged on the inner side wall, the cam is connected with the cam driving mechanism, and a pressing plate is arranged in the lower space of the die; the outer side wall of the die is provided with an eccentric reset mechanism of the die; the follow-up mechanism includes a follow-up support sleeve , movable positioning pin and support sleeve positioning screw, the follow-up support sleeve is connected with the punch through the movable positioning pin, the bottom of the movable positioning pin is also provided with a floating spring, the middle of the follow-up support sleeve is provided with a support sleeve positioning screw, and the top of the follow-up support sleeve is provided. The surface is located under the pressing plate, the top of the die is provided with a rubber spring for buffering, the bottom of the punch is connected to the lower template through the punch fixing plate and the backing plate, and the punch fixing plate, the backing plate and the lower template are connected by locking bolts connected in sequence; the outer periphery of the punch is provided with a limit mechanism, the limit mechanism includes an elastic discharge plate, an upper limit block and a lower limit block, the upper and lower limit blocks of the elastic discharge plate are respectively provided with an upper limit block and a lower limit block, and the elastic discharge plate It is located on the outer periphery of the punch, the upper limit block is fixed on the bottom of the die, and the lower limit block is fixed on the punch fixing plate. The essential shortcomings of the above patent are: first, the above patent drives the die through a cam drive mechanism to do annular horizontal eccentric movement, Then, the follow-up support sleeve and the cylindrical workpiece are also driven to perform annular horizontal eccentric motion, so that the punch can perform annular trimming on the cylindrical workpiece. This operation process is relatively complicated, and the trimming process still belongs to the category of local rotary cutting. The processing efficiency Compared with stamping forming, it is lower; secondly, the above-mentioned patent has complex structure, many parts, and high cost of use; thirdly, the above-mentioned patent cannot be connected to the previous stamping process for progressive die series, which leads to the need to replace the site and the die for cutting after deep drawing. Circumferential residual material operation has low efficiency and limited space for use.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the deficiencies of the prior art, and to provide a simple structure, few components, low cost, convenient operation, no burr in trimming, high efficiency, and can be connected with the previous stamping process. Wall drawing is used for trimming device and trimming method for thin-walled cylindrical parts.

For achieving the above object, the technical scheme adopted in the present invention is:

An edge trimming device for thin-walled deep drawing cylindrical parts, comprising an upper die base and a lower die base, a cylindrical part trimming mechanism is arranged between the upper die base and the lower die base, and the cylindrical part cuts The edge mechanism includes a concave die, a fixed core punch, a punching connection sleeve and a cylindrical knife. The fixed core punch and the punching connection are sleeved above the concave die. The axes of the three sleeves are located on the same vertical line, the lower end of the concave die is fixedly connected with the lower die seat, the upper end of the inner hole of the concave die extends upwards and outwards to form a chamfered support surface, and the upper end of the fixed core punch is connected to the upper end of the upper die. The die base is fixedly connected, the punching connection sleeve is sleeved on the fixed core punch and is fixedly connected with the fixed core punch, the upper end of the punching connection sleeve is fixedly connected with the upper die base, and the lower end is fixedly connected with the cylindrical knife. The lower end of the cylindrical knife is fixed with a knife edge, and the distance from the knife edge of the cylindrical knife to the axis of the punching connection sleeve is not less than half of the width of the inner hole of the concave die, so that when the cylindrical part is put into the concave mold, the cylindrical part is The peripheral residual material is located on the side of the beveled support surface, the upper die seat drives the fixed core punch and the punching connection sleeve to go down, the fixed core punch enters the cylindrical part to support the cylindrical part, and the punching connection sleeve slowly descends to push the cylinder. The peripheral residual material of the shaped piece is pressed against the chamfered support surface and cut off.

The upper end of the punching connection sleeve of the present invention is provided with a buffer spring, the buffer spring is sleeved on the fixed core punch, one end of the buffer spring is fixedly connected with the upper die seat, and the other end is fixedly connected with the punching connection sleeve. The connecting sleeve is sleeved on the fixed core punch and is slidably connected with the fixed core punch, so as to facilitate the downward movement of the punching connecting sleeve. After contacting the peripheral residual material of the cylindrical part, the peripheral residual material of the cylindrical part is pressed down and reacts at the same time. In the punching connection sleeve, the punching connection sleeve is forced upward and squeezes the buffer spring, and the buffer spring rebounds and reacts on the punching connection sleeve. The cylindrical knife of the connecting sleeve gradually presses the peripheral residual material to contact the beveled support surface to realize the separation of the cylinder and the peripheral residual material. The buffer spring can protect the blade and prevent the punching connecting sleeve from falling too fast and hitting the beveled support surface. damage.

The height of the lower end face of the centering punch according to the present invention is lower than the height of the lower end face of the cylindrical blade, so as to facilitate the centering punch and the punching connection sleeve to go down, the centering punch can first enter the female die to support the waiting Cut the cylindrical parts of the peripheral material, and then punch the connecting sleeve into the die with a cylindrical knife to complete the expected cutting operation of the circumference.

The shape of the cylindrical knife edge of the present invention matches the shape of the cross section of the inner hole of the die, so that the shape of the cylindrical knife edge matches the shape of the cross section of the cylindrical piece to be trimmed into the die , in order to obtain less burr-free edge quality.

The shape of the blade of the cylindrical knife of the present invention is circular or square, so as to facilitate the cutting of the peripheral residual material of the cylindrical piece with a square or circular cross-section in cooperation with the concave die.

The upper end of the buffer spring of the present invention is provided with a stop, the width of the stop is greater than the width of the fixed core punch, the upper end of the stop is fixedly connected with the upper die seat, and the lower end is fixedly connected with the fixed core punch. The buffer spring The upper end is fixedly connected with the stopper, so that when the lower end of the punching connection sleeve is moved axially upward by the reaction force of the residual material around the cylindrical part, the upper end of the punching connection sleeve presses the buffer spring against the stopper, and the stopper can give Punched connection sleeves provide rigid support.

A method for trimming a thin-walled deep-drawing cylindrical piece, characterized in that it comprises the following steps:

Step 1: Put the cylindrical part with the peripheral residual material into the die, the width of the cylindrical part matches the width of the inner hole of the concave die, the cylindrical part is placed in the concave die, and the peripheral residual material is limited by the inner hole of the concave die. position, placed between the bevel support surface and the cylindrical knife;

Step 2: The fixed core punch and the punching connection sleeve go down, and the fixed core punch gradually enters the inner cavity of the cylindrical part, forming a core support and correction function for it. When going down, the cylindrical knife at the lower end of the blanking connection sleeve begins to contact the peripheral residual material of the cylindrical part, and the peripheral residual material is forced to approach the beveled support surface. Adjust the downward speed of the fixed core punch and the blanking connection sleeve to make The cylindrical knife presses the peripheral residual material against the beveled support surface, and then the blade of the cylindrical knife is pressed into the peripheral residual material to separate the cylindrical part from the peripheral residual material.

In the second step of the present invention, the cylindrical knife at the lower end of the punching connection sleeve is close to the oblique cutting support surface against the peripheral residual material. After buffering by the buffer spring, the downward speed of the cylindrical knife becomes slower, which slows down the downward speed of the cylindrical knife and protects the cylindrical knife from directly hitting the beveled support surface and damages it. Slow, at the same time, the fixed core punch is still going down, so the punching connection sleeve rises axially relative to the fixed core punch, and squeezes the buffer spring. The back pressure of the punching connection sleeve gradually increases, and the punching connection sleeve is pushed down. The punching connection sleeve drives the cylindrical knife against the peripheral residual material to fall on the inclined cutting support surface, and the blade of the cylindrical knife is pressed into the peripheral residual material. Separate the perimeter residual material from the barrel.

In the second step of the present invention, the punching connection sleeve rises axially relative to the fixed core punch, squeezes the buffer spring, and continuously approaches the upper die seat or the stopper, and the upper die seat or the stopper can provide the punching connection sleeve. Rigid support, as the fixed core punch continues to descend, the blanking connection sleeve drives the blade of the cylindrical knife to press into the peripheral residual material, and separates the peripheral residual material from the cylindrical part.

Due to the above structure, the present invention has the advantages of simple structure, few components, low cost, convenient operation, no burr in trimming, high efficiency, and can be connected in series with the progressive die in the previous stamping process.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the device for trimming thin-walled deep-drawn cylindrical parts according to the present invention.

Fig. 2 is a schematic diagram of the positioning punch, the punching connecting sleeve and the cylindrical knife in the present invention going down to cut off the residual material around the cylindrical part.

Fig. 3 is a schematic structural diagram of a cylindrical member with peripheral residual material in the present invention.

FIG. 4 is a schematic structural diagram of the cylindrical member in the present invention after the peripheral residual material is removed.

Reference numerals: female die 1, fixed core punch 2, punching connection sleeve 3, cylindrical knife 4, chamfered support surface 5, buffer spring 6, stop 7, cylindrical piece 8, peripheral residual material 9.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

An edge trimming device for thin-walled deep drawing cylindrical parts, comprising an upper die base and a lower die base, a cylindrical part trimming mechanism is arranged between the upper die base and the lower die base, and the cylindrical part cuts The edge mechanism includes a concave die 1, a fixed core punch 2, a punching connection sleeve 3 and a cylindrical knife 4. The fixed core punch 2 and the punching connection sleeve 3 are arranged above the concave die 1. The concave die 1, The axes of the centering punch 2 and the punching connection sleeve 3 are located on the same vertical line, the lower end of the die 1 is fixedly connected with the lower die seat, and the upper end of the inner hole of the die 1 extends upward and outward to form a chamfered cut Support surface 5, the upper end of the fixed core punch 2 is fixedly connected with the upper die seat, the punching connection sleeve 3 is sleeved on the fixed core punch 2 and is fixedly connected with the fixed core punch 2, the punching connection sleeve 3. The upper end is fixedly connected with the upper die seat, and the lower end is fixedly connected with the cylindrical knife 4. The lower end of the cylindrical knife 4 is fixed with a blade, and the distance from the blade of the cylindrical knife 4 to the axis of the punching connection sleeve 3 is not less than that of the die 1 Half of the width of the inner hole, so that when the cylindrical part is put into the die, the peripheral residual material of the cylindrical part is located on the side of the beveled support surface, and the upper die seat drives the fixed core punch and the punching connection sleeve to go down , the fixed core punch enters the cylindrical part to support the cylindrical part, and the punching connecting sleeve slowly descends to press the peripheral residual material of the cylindrical part on the oblique cutting support surface and cut it off.

The upper end of the punching connection sleeve 3 of the present invention is provided with a buffer spring 6, the buffer spring 6 is sleeved on the fixed core punch 2, one end of the buffer spring 6 is fixedly connected to the upper die seat, and the other end is fixed to the punching connection sleeve 3 Connection, the punching connection sleeve 3 is sleeved on the fixed core punch 2 and is slidably connected with the fixed core punch 2, so as to facilitate the punching connection sleeve to go down, after contacting the peripheral residual material of the cylindrical piece, the When the surrounding residual material is pressed down, it will react to the punching connection sleeve. The punching connection sleeve is forced upward and squeezes the buffer spring. The buffer spring rebounds and reacts on the punching connection sleeve. With the buffer spring applied to the punching connection The back pressure of the sleeve continues to increase, and the cylindrical knife of the blanking connection sleeve gradually presses the peripheral residual material to contact the beveled support surface to realize the separation of the cylinder and the peripheral residual material. The buffer spring can protect the blade and prevent the blanking connection sleeve. Falling too fast hits the beveled support surface and damages it.

The height of the lower end face of the centering punch 2 in the present invention is lower than the height of the lower end face of the blade of the cylindrical knife 4, so as to facilitate the centering punch and the punching connection sleeve to go down, the centering punch can first enter the concave die Support the cylindrical part of the remaining material to be cut, and then punch the connecting sleeve into the die with the cylindrical knife to complete the expected cutting operation of the circumference.

The shape of the blade of the cylindrical knife 4 of the present invention matches the shape of the cross section of the inner hole of the die 1, so as to facilitate the shape of the cylindrical knife edge and the shape of the cross section of the cylindrical piece to be trimmed into the die matched for burr-free edge quality.

The shape of the blade of the cylindrical knife 4 of the present invention is circular or square, so as to facilitate the cutting of the peripheral residual material of the cylindrical part with a square or circular cross-section in cooperation with the female die.

The upper end of the buffer spring 6 of the present invention is provided with a stopper 7, the width of the stopper 7 is larger than the width of the fixed core punch 2, the upper end of the stopper 7 is fixedly connected with the upper die seat, and the lower end is fixed with the fixed core punch 2 The upper end of the buffer spring 6 is fixedly connected with the stop 7, so that when the lower end of the punching connection sleeve is moved axially upward by the reaction force of the residual material around the cylindrical part, the upper end of the punching connection sleeve presses the buffer spring against the On the stop, the stop can provide rigid support for the punching connection sleeve.

A method for trimming a thin-walled deep-drawing cylindrical piece, characterized in that it comprises the following steps:

Step 1: Put the cylindrical part 8 with the peripheral residual material 9 into the die 1, the width of the cylindrical part 8 matches the width of the inner hole of the concave die 1, the cylindrical part 8 is placed in the concave die 1, and the peripheral residual The material 9 is limited by the inner hole of the die 1, and is placed between the chamfering support surface 5 and the cylindrical knife 4;

Step 2: The fixed core punch 2 and the punching connection sleeve 3 go down, and the fixed core punch 2 gradually enters the inner cavity of the cylindrical member 8 to form a core support and correction function for it. Further down the cutting connecting sleeve 3, the cylindrical knife 4 at the lower end of the blanking connecting sleeve 3 begins to contact the peripheral residual material 9 of the cylindrical part 8, and the peripheral residual material 9 is forced to approach the oblique cutting support surface 5, and the centering is adjusted. The downward speed of the punch 2 and the punching connection sleeve 3 makes the cylindrical knife 4 press the peripheral residual material 9 against the beveled support surface 5, and then the blade of the cylindrical knife 4 is pressed into the peripheral residual material 9, and the cylindrical knife 4 is pressed into the peripheral residual material 9. Piece 8 is separated from peripheral residual material 9.

In the second step of the present invention, the cylindrical knife 4 at the lower end of the blanking connection sleeve 3 is close to the oblique cutting support surface 5 against the peripheral residual material 9, and the peripheral residual material 9 is subjected to a force against the cylindrical knife 4, and the cylindrical knife 4 After the punching connection sleeve 3 at the upper end is buffered by the buffer spring 6, the downward speed of the cylindrical knife 4 is slowed down, which slows down the descending speed of the cylindrical knife 4 and protects the cylindrical knife 4 from directly hitting the beveled support surface 5 and being damaged. As a result, the cylindrical knife 4 drives the punching connection sleeve 3 to go down slowly, and at the same time, the fixed core punch 2 is still going down, so the punching connection sleeve 3 rises axially relative to the fixed core punch 2, squeezing the buffer spring 6. As the fixed core punch 2 continues to descend, the back pressure exerted by the buffer spring 6 on the punching connection sleeve 3 gradually increases due to the extrusion and rebound, pushing the punching connection sleeve 3 to go down, and the punching connection sleeve 3 drives the cylindrical knife. 4 falls on the chamfered support surface 5 against the peripheral residual material 9, and the blade of the cylindrical knife 4 is pressed into the peripheral residual material 9 to separate the peripheral residual material 9 from the cylindrical member 8.

In the second step of the present invention, the punching connection sleeve 3 axially rises relative to the fixed core punch 2, squeezes the buffer spring 6, and continuously approaches the upper die base or the stop 7, and the upper die base or the stop 7 may be The punching connection sleeve 3 provides rigid support. As the fixed core punch 2 continues to descend, the punching connection sleeve 3 drives the blade of the cylindrical knife 4 to press into the peripheral residual material 9 to separate the peripheral residual material 9 from the cylindrical part 8 .

As shown in the accompanying drawings, Figure 1 is the state where the cylindrical part that needs to be trimmed is put into the concave die, the concave die is separated from the fixed core punch and the punching connection sleeve, and Figure 2 is the fixed core punch and the punching connection sleeve. Go down, close to the die to close the mold, and the cylindrical knife goes down against the peripheral residual material and cuts off the peripheral residual material. Figure 3 shows the cylindrical part that needs to be trimmed in the present invention. The upper end of the cylindrical part has a peripheral edge. For the residual material, the wall thickness of the cylindrical part can be very thin, such as a metal slab with a thickness of less than 2 mm, a cylindrical part with a peripheral residual material formed by deep drawing without edge pressing, Figure 4 is a cylindrical part of the present invention. The schematic diagram after the remaining material, the cylindrical member in the present invention can be a cylinder or a square cylinder, the cross section of the inner hole of the female die, the cross section of the chamfered support surface, the cross section of the fixed core punch and the cylindrical shape in the present invention The cross-section of the blade of the knife is matched with the cylindrical piece; if the cross-section of the cylindrical piece that needs to cut the peripheral residual material is circular, then the cross-section of the inner hole of the die and the cross-section of the chamfered support surface , The cross-section of the fixed core punch and the cross-section of the blade of the cylindrical knife are round; if the cross-section of the cylindrical part that needs to cut off the peripheral residual material is square, then the cross-section of the inner hole of the concave mold, oblique The cross section of the cutting support surface, the cross section of the fixed core punch and the cross section of the blade of the cylindrical knife are all square; The width is matched with the width of the inner wall of the cylindrical piece, the fixed core punch can be set in a stepped shape, and the fixed core punch can also be integrally formed with the baffle in the present invention, or not integrally formed, and the stepped design is used to define the punching connection sleeve. The distance from the blade of the cylindrical knife to the axis of the blanking connection sleeve is not less than half of the width of the inner hole of the die. The blade of the cylindrical knife can be set vertically downward or inclined outward, which is convenient for bevel cutting. The support surface cooperates to cut the peripheral residual material of the cylindrical piece, and the oblique cutting support surface is inclined. When in use, the cylindrical piece is placed in the concave die, the outer wall of the cylindrical piece is matched with the inner hole of the concave die, and the peripheral residual material of the cylindrical piece is Located between the beveled support surface and the cylindrical knife, the cylindrical part is positioned and the mold is clamped. The fixed core punch and the blanking connection sleeve begin to descend under the action of the press slider, and the fixed core punch gradually enters the cylindrical shape. Inside the part, the outer wall of the fixed core punch is in conflict with the inner wall of the cylindrical part. The fixed core punch can support and correct the position of the cylindrical part. The shaped knife touches the peripheral residual material of the cylindrical part, and is subjected to the reaction force of the peripheral residual material. The punching connection sleeve is forced to slide upward along the fixed core punch, squeeze the buffer spring, and the spring generates a rebound force, which pushes the punching connection sleeve. Downwards, the cylindrical knife presses against the peripheral residual material to the chamfered support surface and cuts it off. In the present invention, through the coordinated movement of the fixed core punch and the blanking connection sleeve, the punch can be vertically moved up and down and gradually enter the concave. After the mold, the residual material around the cylindrical part can be cut off, and the trimming quality with less burrs can be obtained. The sequential deep drawing process is progressively associated, and the deep drawing of the cylindrical part and the peripheral residual material removal are completed in a pair of molds, with high production efficiency, few parts, low cost and convenient operation.

Due to the above structure, the present invention has the advantages of simple structure, few components, low cost, convenient operation, no burr in trimming, high efficiency, and can be connected in series with the progressive die in the previous stamping process.

Claims (9)

1. An edge trimming device for thin-walled deep drawing cylindrical parts, comprising an upper die base and a lower die base, and a cylindrical part trimming mechanism is arranged between the upper die base and the lower die base, and the cylindrical part is The edge trimming mechanism includes a concave die, a fixed core punch, a punching connection sleeve and a cylindrical knife. The fixed core punch and the punching connection sleeve are set above the concave die. The axes of the three cutting connection sleeves are located on the same vertical line, the lower end of the female die is fixedly connected with the lower die seat, the upper end of the inner hole of the female die extends upward and outward to form a chamfered support surface, and the upper end of the fixed core punch It is fixedly connected with the upper die base, the punching connection sleeve is sleeved on the fixed core punch and is fixedly connected with the fixed core punch, the upper end of the punching connection sleeve is fixedly connected with the upper die base, and the lower end is fixedly connected with the cylindrical knife, A knife edge is fixed at the lower end of the cylindrical knife, and the distance from the knife edge of the cylindrical knife to the axis of the punching connecting sleeve is not less than half of the width of the inner hole of the die. 2 . The edge trimming device for thin-walled deep drawing cylindrical parts according to claim 1 , wherein the upper end of the punching connection sleeve is provided with a buffer spring, and the buffer spring is sleeved on the fixed core punch. 3 . In the upper part, one end of the buffer spring is fixedly connected with the upper die seat, and the other end is fixedly connected with the punching connection sleeve, which is sleeved on the fixed core punch and slidably connected with the fixed core punch. 3. An edge trimming device for thin-walled deep drawing cylindrical parts according to claim 1 or 2, characterized in that: the height of the lower end face of the centering punch is lower than the height of the lower end face of the cylindrical blade. . 4 . The edge trimming device for thin-walled deep drawing cylindrical parts according to claim 3 , wherein the shape of the cylindrical knife edge matches the shape of the cross section of the inner hole of the die. 5 . 5 . The edge trimming device for thin-walled deep drawing cylindrical parts according to claim 1 , wherein the shape of the cutting edge of the cylindrical knife is circular or square. 6 . 6 . The edge trimming device for thin-walled deep drawing cylindrical parts according to claim 5 , wherein the upper end of the buffer spring is provided with a stop, and the width of the stop is greater than the width of the fixed core punch. 7 . The upper end of the baffle is fixedly connected with the upper die seat, the lower end is fixedly connected with the fixed core punch, and the upper end of the buffer spring is fixedly connected with the baffle. 7. a kind of trimming method for thin-walled deep drawing cylindrical part according to claim 1 or 2 or 4 or 6, is characterized in that: comprises the following steps: Step 1: Put the cylindrical part with the peripheral residual material into the die, the width of the cylindrical part matches the width of the inner hole of the concave die, the cylindrical part is placed in the concave die, and the peripheral residual material is limited by the inner hole of the concave die. position, placed between the bevel support surface and the cylindrical knife; Step 2: The fixed core punch and the punching connection sleeve go down, and the fixed core punch gradually enters the inner cavity of the cylindrical part, forming a core support and correction function for it. When going down, the cylindrical knife at the lower end of the blanking connection sleeve begins to contact the peripheral residual material of the cylindrical part, and the peripheral residual material is forced to approach the beveled support surface. Adjust the downward speed of the fixed core punch and the blanking connection sleeve to make The cylindrical knife presses the peripheral residual material against the beveled support surface, and then the blade of the cylindrical knife is pressed into the peripheral residual material to separate the cylindrical part from the peripheral residual material. 8 . A method for trimming thin-walled deep-drawing cylindrical parts according to claim 7 , wherein in the second step, the cylindrical knife at the lower end of the blanking connection sleeve is syncronically inclined against the peripheral residual material. 9 . When the cutting support surface is close, the surrounding residual material reacts to the cylindrical knife. After the punching connecting sleeve at the upper end of the cylindrical knife is buffered by the buffer spring, the downward speed of the cylindrical knife becomes slower, which slows down the descending speed of the cylindrical knife and protects the barrel. The shape knife will not directly hit the chamfered support surface and damage it. The cylindrical knife drives the punching connection sleeve to go down slowly. At the same time, the fixed core punch is still going down, so the blanking connection sleeve is relatively opposite to the fixed core punch. Axial rise, squeeze the buffer spring, as the fixed core punch continues to descend, the back pressure exerted by the buffer spring on the punching connection sleeve gradually increases due to the extrusion and rebound, pushes the punching connection sleeve to go down, and the punching connection sleeve drives the cylinder The shaped knife falls on the inclined cutting support surface against the peripheral residual material, and the blade of the cylindrical knife is pressed into the peripheral residual material to separate the peripheral residual material from the cylindrical part. 9. A method for trimming thin-walled deep-drawing cylindrical parts according to claim 7 or 8, wherein in the second step, the punching connection sleeve is axially raised relative to the fixed core punch , Squeeze the buffer spring, keep approaching the upper die holder or the stopper, the upper die holder or the stopper can provide rigid support for the punching connection sleeve. As the fixed core punch continues to descend, the punching connection sleeve drives the blade of the cylindrical knife Press in the peripheral residual material to separate the peripheral residual material from the cylindrical part.

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