A protective cover continuous stretch press forming die

Abstract

This invention discloses a continuous stretching and stamping forming die for a protective cover, comprising an upper die and a lower die. The upper die moves linearly up and down relative to the lower die. The upper die is connected to the stamping slide of a stamping machine, and the lower die is connected to the working platform of the stamping machine. The invention is characterized by the following steps: left and right side trimming, front and rear side trimming, primary stretching, secondary stretching, side punching of a left-side round hole, side punching of a right-side round hole, side punching of a non-circular hole, straight punching of a non-circular hole, notch punching, and finished product blanking. This invention achieves "one-time feeding, multiple processes completed simultaneously" by sequentially setting up multi-station progressive stamping dies on a single die set, greatly improving production efficiency and ensuring the dimensional accuracy of the stamped workpiece, especially the positional dimensional accuracy between the four round holes on the front and rear sides of the workpiece and the non-circular hole below the center of the four round holes, significantly improving the product yield.

Description

Technical Field

[0001] This invention relates to the field of protective cover manufacturing technology, and in particular to a continuous stretching and stamping die for protective covers. Background Technology

[0002] Protective cover parts are used in automobiles, electronics, and home appliances. With the development of these industries, the demand for protective cover parts is increasing. Traditionally, protective cover parts are stamped using multiple single-stage dies on multiple presses. The workpiece needs to be re-clamped and positioned on each die, resulting in low production efficiency and difficulty in meeting the needs of large-scale production. Furthermore, protective cover parts have strict dimensional tolerance requirements, especially the four round holes and the irregular holes in the middle of the four round holes on the front or rear side wall of the workpiece shell, which require high precision. Traditional dies cannot form these parts in a single side punching operation, and the multi-stage die clamping can easily lead to cumulative errors, resulting in a low product qualification rate.

[0003] Therefore, it is necessary to design a continuous stretching side punch die, which can achieve "one-time feeding and simultaneous completion of multiple processes" through a multi-station progressive structure, thereby improving dimensional accuracy and increasing product qualification rate. Summary of the Invention

[0004] To address the problems of traditional protective cover stamping technology, which involves multiple single-stage dies, complex structures, multiple mold openings or manual intervention, and the need for multiple stamping operations to complete a single part, resulting in long production cycles, low resource utilization, and cumulative errors from multiple positioning operations leading to dimensional deviations and large fluctuations in yield, this invention provides a continuous stretching stamping forming die for protective covers. By sequentially setting multi-station progressive stamping dies on a single die set, it achieves "one-time feeding and simultaneous completion of multiple processes," greatly improving production efficiency and enhancing the dimensional accuracy of workpiece stamping and product qualification rate.

[0005] To achieve the above objectives, the present invention provides a continuous stretching and stamping forming die for a protective cover, comprising an upper die and a lower die. The upper die moves linearly up and down relative to the lower die. The upper die is connected to the stamping slide of a stamping machine, and the lower die is connected to the working platform of the stamping machine. The protective cover continuous stretching and stamping forming die comprises multiple stamping steps, which are performed in the following order: trimming the left and right sides, trimming the front and rear sides, primary stretching, secondary stretching, side punching of the left side round hole, side punching of the right side round hole, side punching of the irregular hole, straight punching of the irregular hole, notch punching, and finished product blanking.

[0006] The upper die is provided with left and right side profile trimming upper dies, front and rear side profile trimming upper dies, first stretching upper die, second stretching upper die, side punch left round hole upper die, side punch right round hole upper die, side punch irregular hole upper die, straight punch irregular hole upper die, notch punching upper die and blanking upper die, which correspond to multiple stamping steps in sequence. The lower die is provided with left and right side profile trimming lower dies, front and rear side profile trimming lower dies, first stretching lower die, second stretching lower die, side punching left round hole lower die, side punching right round hole lower die, side punching irregular hole lower die, straight punching irregular hole lower die, notch punching lower die and blanking lower die, which correspond to multiple stamping steps in sequence.

[0007] As a further improvement of this technology, the upper die for cutting the left and right sides of the outer shape includes left and right side outer shape cutting punches and insert punches. Two insert punches are provided, which are respectively located on the front and rear sides of the left and right side outer shape cutting punches. The lower die for cutting the left and right sides of the outer shape includes left and right side outer shape cutting dies. Insert punch holes are provided on the left and right side outer shape cutting dies. There are two insert punch holes, which correspond to the two insert punches respectively. During operation, the left and right side outer shape cutting punches move down and cooperate with the left and right side outer shape cutting dies to punch out the left and right side outer shape holes of each pair of adjacent workpieces on the workpiece strip. The insert punches move down synchronously and cooperate with the insert punch holes to punch out the positioning holes for subsequent stamping on the front and rear sides of the workpiece strip. The upper die has multiple working positions on the front and rear sides of the workpiece strip, each equipped with a pin and a pressure rod. The pin is used to insert into the corresponding positioning hole on the workpiece strip during subsequent stamping steps. The pressure rod is located on the left and / or right side of the pin, and each pressure rod has a compression spring at its upper end to press the workpiece strip during stamping. The pin and pressure rod are used to prevent the workpiece strip from being misaligned or deformed.

[0008] As a further improvement of this technology, the upper die for cutting the front and rear outer contours includes two front and rear outer contour cutting punches, which are symmetrically arranged on the front and rear sides of the workpiece strip. The lower die for cutting the front and rear outer contours includes two symmetrical front and rear outer contour cutting dies. During operation, the front and rear outer contour cutting punches move downward and cooperate with the front and rear outer contour cutting dies to punch out the front and rear outer contour holes of the workpiece strip.

[0009] As a further improvement of this technology, the primary stretching upper die includes a first fixed die and a first movable die, and the primary stretching lower die includes a first stretching punch. The first movable die and the first fixed die are connected in a vertically movable manner. A first lifting mechanism is provided below the first stretching punch so that the first stretching punch can move vertically. During operation, the upper die descends to the lower end face of the first fixed die and fits against the upper plane of the workpiece strip, while the lower plane of the first movable die fits against the upper plane of the first stretching punch. The first lifting mechanism drives the first stretching punch and the first movable die to move upward in a straight line synchronously, thus obtaining a workpiece shell after one stretching. The secondary stretching upper die includes a second fixed die and a second movable die, and the secondary stretching lower die includes a second stretching punch. The second movable die and the second fixed die are connected in a vertically movable manner. A second lifting mechanism is provided below the second stretching punch so that the second stretching punch can move vertically. During operation, the upper die descends to the lower end face of the second fixed die and fits against the upper plane of the workpiece strip. The lower plane of the second movable die fits against the upper plane of the second stretching punch. The second lifting mechanism drives the second stretching punch and the second movable die to move upward in a straight line synchronously, thus obtaining a secondary extension shell with steps on the workpiece.

[0010] As a further improvement to this technology, the side punch upper die for the left circular hole includes a first insert, a first slide plate, a first slider, a second slider, a first fixing plate, a first side punch pin, and a first cylinder. Two first slide plates are provided, arranged parallel and symmetrically. The symmetrical plane of the two first slide plates is in the same plane as the axis of the workpiece's inner cavity. The opposite sides of the two first slide plates are provided with first slide grooves parallel to the symmetrical plane. The first slider and the second slider are detachably fixedly connected. Both sides of the first slider and the second slider have outwardly extending bosses corresponding to the positions of the first slide grooves. The bosses on both sides of the first slider and the second slider are inserted into the corresponding first slide grooves, forming a linearly movable connection with the first slide plate. Two first side punch pins are provided, symmetrically arranged on both sides of the symmetrical plane within the first slider and the second slider, with their axes parallel to the symmetrical plane. Two first cylinders are provided, the two pins being parallel to the symmetrical plane. The first side punch is located on the outside of the first and second sliders, with its axis parallel to the plane of symmetry. The first fixed plate is perpendicular to the plane of symmetry and is located on the outside of the workpiece shell at the position of the left side circular hole to be punched. The first fixed plate has a first arc groove in the middle of the side near the workpiece end, and a first groove with the same shape as the workpiece is provided at the lower end of the first arc groove. During operation, the first groove fits into the workpiece shell. The side of the first fixed plate far from the workpiece is fixedly connected to the end of the piston rod of the first cylinder. The first insert can move linearly up and down relative to the first slide plate. The lower end face of the first insert is set as a first inclined surface facing the first slider. The outer end of the first slider has a second inclined surface that cooperates with the first inclined surface. The first inclined surface and the second inclined surface fit together to form a first wedge. The upper die for punching the left side circular hole has two pieces, which are symmetrically arranged on the front left and rear left sides of the workpiece, and are used to punch the four left side circular holes on the front left and rear left sides of the workpiece shell. The side punch lower die for the left circular hole includes a first side punch die holder and a first side punch die. The first side punch die holder is set inside the workpiece cavity during stamping. The front, left and rear three sides have the same shape as the inner shape of the workpiece cavity. The right side is set as a vertical cutting plane. There are two first side punch dies, which are respectively set in the front and rear sides of the first side punch die holder and the corresponding positions of the first side punch punch. A third lifting mechanism is provided below the first side punch die holder so that the first side punch die holder and the first side punch die can move vertically in a straight line. During operation, the third lifting mechanism drives the first side punch die holder and the first side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner side wall of the workpiece cavity. The upper die descends to the lower end face of the first slide plate and is in contact with the upper plane of the workpiece strip. The first inserter continues to descend and pushes the first slider and the second slider to move towards the workpiece with the two first side punches. They cooperate with the first side punch die to punch out four left-side round holes on the left side of the front and rear side walls of the workpiece shell. After the punching is completed, the first cylinder is started, which drives the first slider, the second slider, and the first side punches to reset. The upper and lower dies for the right circular hole of the side punch are structurally identical to the upper and lower dies for the left circular hole of the side punch, and are arranged symmetrically with the upper and lower dies for the left circular hole of the side punch. The upper die for the right circular hole of the side punch includes a second insert, a second slide plate, a third slider, a fourth slider, a second fixing plate, a second side punch, and a second cylinder. The lower die for the right circular hole of the side punch includes a second side punch die holder and a second side punch die. A fourth lifting mechanism is provided below the second side punch die holder, so that the second side punch die holder and the second side punch die can move vertically. During operation, the fourth lifting mechanism drives the second side punch die holder and the second side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner wall of the workpiece cavity. The upper die descends to the lower end face of the second slide plate and is in contact with the upper plane of the workpiece strip. The second inserter continues to descend, pushing the third slider and the fourth slider to move towards the workpiece with the two second side punch needles. They cooperate with the second side punch die to punch out four right-side round holes on the right side of the front and rear side walls of the workpiece shell. After the punching is completed, the second cylinder is started, driving the third slider, the fourth slider, and the second side punch needles to reset.

[0011] As a further improvement to this technology, the side-punching die for irregular holes includes a third inserter, a third slide plate, a fifth slider, a sixth slider, a third fixing plate, an irregular hole side punch, and a third cylinder. Two third slide plates are provided, arranged parallel and symmetrically. The symmetrical plane of the two third slide plates is in the same longitudinal plane as the workpiece's inner cavity axis. Third slide grooves parallel to the symmetrical planes are provided on the opposite sides of the two third slide plates. The fifth and sixth sliders have outwardly extending bosses on their sides corresponding to the third slide grooves. These bosses are inserted into the corresponding third slide grooves, forming a linearly movable connection with the third slide plates. The irregular hole side punch is located within the fifth and sixth sliders, with its longitudinal center plane coinciding with the symmetrical plane. Two third cylinders are provided, symmetrically arranged on the fifth and sixth sliders. The axes of the punches on both sides of the inner irregular hole side punch are parallel to the plane of symmetry. The third fixed plate is perpendicular to the plane of symmetry of the two third sliding plates and is located on the outer side of the workpiece shell at the position where the irregular hole is to be punched. The middle of the side of the third fixed plate near the workpiece end is provided with a third arc groove. The lower end of the third arc groove is provided with a third groove that is consistent with the shape of the workpiece. During operation, the third groove fits into the workpiece shell. The side of the third fixed plate far from the workpiece is fixedly connected to the end of the piston rod of the third cylinder. The third insert can move linearly up and down relative to the third sliding plate. The lower end face of the third insert is provided with a fifth inclined surface facing the fifth slider. The upper side of the outer end of the fifth slider is provided with a sixth inclined surface that cooperates with the fifth inclined surface. The fifth inclined surface and the sixth inclined surface fit together to form a third inclined wedge. The upper die for punching irregular holes on the side is provided with two pieces. The two pieces are symmetrically located in the middle of the front and rear sides of the workpiece and are used to punch the upper part of the two irregular holes in the middle of the front and rear side walls of the workpiece. The side punching die for irregular holes includes a side punching die base and a side punching die. The side punching die base is placed inside the workpiece cavity during stamping. The front, left, and rear sides have the same shape as the inner cavity of the workpiece. The right side is a vertical cutting plane. There are two side punching dies, which are respectively installed in the front and rear sides of the side punching die base and correspond to the side punching head. A fifth lifting mechanism is provided below the side punching die base, so that the side punching die base and the side punching die can move vertically. During operation, the fifth lifting mechanism drives the irregular hole side punch die holder and irregular hole side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner side wall of the workpiece cavity. The upper die descends to the lower end face of the third slide plate and is in contact with the upper plane of the workpiece strip. The third inserter continues to descend, pushing the fifth slider and the sixth slider to move the irregular hole side punch head toward the workpiece. It cooperates with the irregular hole side punch die to punch out the upper part of two irregular holes on the front and rear side walls of the workpiece. After the punching is completed, the third cylinder is started, driving the fifth slider, the sixth slider and the irregular hole side punch head to reset.

[0012] As a further improvement to this technology, the upper die for punching irregular holes includes two punches for punching irregular holes, which are symmetrically arranged on the front and rear sides of the workpiece. The lower die for punching irregular holes includes a first workpiece positioning seat and a die for punching irregular holes. The first workpiece positioning seat is set inside the inner cavity of the workpiece during stamping. The front, right, and rear sides have the same shape as the inner cavity of the workpiece. The left side is set as a vertical cutting plane. The front and rear sides of the first workpiece positioning seat are provided with clearance notches corresponding to the positions of the punches for punching irregular holes. The die for punching irregular holes is provided with two pieces, which are respectively set on the front and rear sides of the workpiece and corresponding to the positions of the punches for punching irregular holes. A sixth lifting mechanism is provided below the first workpiece positioning seat, so that the first workpiece positioning seat can move vertically. During operation, the sixth lifting mechanism drives the first workpiece positioning seat to rise to the outer side and fit against the inner wall of the workpiece cavity. The irregular hole punch descends and cooperates with the irregular hole punch die to punch out the lower part of the irregular hole on the front and rear flanges of the workpiece, so that the upper part of the irregular hole and the lower part of the irregular hole are smoothly connected to obtain a complete irregular hole.

[0013] As a further improvement of this technology, the continuous stretching and stamping forming die for the protective cover also includes a pre-punching step. The pre-punching step is located between the straight punching of the irregular hole and the notch punching step, and is used to prevent deformation of the workpiece during notch punching. The pre-punching step and the straight punching of the irregular hole are located at the same station. The upper die is provided with a pre-punching upper die, which includes a pre-punching punch. The pre-punching punch is located at the notch to be punched on the right side of the workpiece. The lower die is provided with a pre-punching lower die, which includes a pre-punching die. The pre-punching die is embedded in the first workpiece positioning seat at a position corresponding to the pre-punching punch. During operation, the first workpiece positioning seat, carrying the pre-punching die, rises to the outer side and fits against the inner wall of the workpiece cavity. The pre-punching punch descends and cooperates with the pre-punching die to punch a pre-punched hole on the right side of the upper wall of the workpiece.

[0014] As a further improvement of this technology, the upper blanking die includes a blanking punch, and the lower blanking die includes a third workpiece positioning seat and a blanking die. The third workpiece positioning seat is located on the upper right side of the blanking die and is located inside the workpiece cavity during stamping. The front, left and rear three sides have the same shape as the workpiece cavity. The right side is set as a vertical cutting plane. An eighth lifting mechanism is provided below the blanking die so that the blanking die can move up and down linearly. During operation, the eighth lifting mechanism raises the blanking die and the third positioning seat until the outer side of the third workpiece positioning seat is in contact with the inner wall of the workpiece cavity. The blanking punch descends and cooperates with the blanking die to cut off the excess material strip between the front and rear sides of two adjacent workpieces. Each workpiece is punched once on the left and right sides to obtain the final, fully formed finished workpiece. As a further improvement to this technology, a feeder and a feeding detection device are also included. The feeder is used to convey the workpiece strip to the right at equal intervals for each stamping of the continuous stretching and stamping die of the protective cover. The feeding detection device includes a micro switch, a detection pin, and a detection pin. The micro switch and the detection pin are both fixedly connected to the upper die. The outer surface of the upper end of the detection pin is provided with an annular arc groove. One end of the detection pin is fixedly connected to one side of the micro switch, and the other end is a hemispherical head. The hemispherical head cooperates with the annular arc groove and is inserted into the annular arc groove. The micro switch is communicatively connected to the power controller. During operation, the upper die descends, causing the detection pin, micro switch, and detection pin to descend synchronously. If the workpiece strip is fed crookedly or not in place, the detection pin will be unable to descend and insert into the positioning hole, while the detection pin continues to descend. The annular arc groove and the hemispherical head of the detection pin will misalign, pushing the detection pin to trigger the micro switch. The micro switch sends the detection information to the power controller, which then cuts off the power to the control circuit, thereby protecting the mold and the stamping machine.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves "one-time feeding and simultaneous completion of multiple processes" by sequentially setting multi-station progressive stamping dies on a single mold, which greatly improves production efficiency, ensures the dimensional accuracy between the four round holes punched on the front and rear sides of the workpiece and the irregular hole below the middle of the four round holes, and greatly improves the product yield. 2. The present invention punches positioning holes on the strip in the first step and sets multiple pins on the upper die. Each time the workpiece is punched, the multiple pins are inserted into the corresponding positioning holes on the strip, which improves the positioning accuracy of the workpiece in each step and thus ensures the dimensional accuracy of the workpiece during punching. 3. By setting up a feeding detection device, when the workpiece strip is not fed in place or is fed crookedly, the feeding detection device will trigger a micro switch. The micro switch will send the detection information to the power controller, and the power controller will cut off the power to the control circuit, thereby protecting the mold and the stamping machine and improving the service life of the mold and the stamping machine. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the upper mold portion structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the stamping structure corresponding to the workpiece strip in an embodiment of the present invention; Figure 4 This is a schematic diagram of the lower mold portion structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the upper mold, workpiece, and lower mold structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the longitudinal section structure of a primary stretching die according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the longitudinal section of the secondary stretching die according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the upper die structure for the left circular hole of the side punch according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the cylinder installation in the upper die with the left circular hole of the side punch according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the installation of the first side punch pin in the upper die with the left circular hole of the side punch according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the upper die structure for side-punching irregular holes according to an embodiment of the present invention; Figure 12 This is a schematic diagram of the installation of the side punch for irregular holes in the upper die of the side punch irregular hole according to an embodiment of the present invention; Figure 13 This is a schematic diagram of the feeding detection device according to an embodiment of the present invention; In the diagram: 1. Upper die; 101. Left and right side cutting upper die; 1011. Left and right side cutting punches; 1012. Inserting punch; 102. Front and rear side cutting upper die; 1021. Front and rear side cutting punches; 103. First drawing upper die; 1031. First fixed die; 1032. First movable die; 104. Second drawing upper die; 1041. Second fixed die; 1042. Second movable die; 105. Side punch left side round hole upper die; 1051. First insert; 1052. First slide plate; 10521. First slide; 1053. First slider; 10531. First boss. 1054. Second slider; 10541. Second boss; 1055. First side punch; 1056. First cylinder; 1057. First fixing plate; 10571. First arc groove; 10572. First groove; 106. Upper die for the right side hole of the side punch; 107. Upper die for the irregular hole of the side punch; 1071. Third insert; 1072. Third slide plate; 10721. Third slide; 1073. Fifth slider; 10731. Fifth boss; 1074. Sixth slider; 10741. Sixth boss; 1075. Punch for the irregular hole of the side punch; 1076. Third cylinder. 1077, Third fixing plate; 10771, Third arc groove; 10772, Third groove; 108, Straight punch irregular hole upper die; 1081, Workpiece positioning seat; 1082, Straight punch irregular hole punch; 109, Pre-punching upper die; 1091, Pre-punching punch; 110, Notched punch upper die; 1101, Notched punch punch; 111, Blanking upper die; 1111, Blanking punch; 112, Pressure bar; 113, Insert pin; 2, Lower die; 201, Left and right side profile trimming lower die; 2011, Left and right side profile trimming die; 2012, Insert pin die hole; 202, Front Rear side trimming die, 2021, Front and rear side trimming dies, 203, First drawing die, 2031, First drawing punch, 204, Second drawing die, 2041, Second drawing punch, 205, Side punch left round hole die, 2051, First side punch die holder, 2052, First side punch die, 206, Side punch right round hole die, 2061, Side punch right round hole die holder, 2062, Side punch right round hole die, 207, Side punch irregular hole die, 2071, Side punch irregular hole die holder, 2072, Side punch irregular hole die, 208, Straight punch irregular hole die, 2 081. Workpiece positioning seat; 2082. Straight punch die for irregular hole; 209. Pre-punching die; 2091. Pre-punching die; 210. Notched die; 2101. Notched die; 211. Blanking die; 2111. Workpiece positioning seat; 2112. Blanking die; 3. Workpiece strip; 301. Left and right side cutting holes; 302. Positioning hole; 303. Front and rear side cutting holes; 304. First-stretch shell; 305. Second-stretch shell; 306. Left side round hole; 307. Right side round hole; 308. Upper part of irregular hole; 309. Irregular hole; 310. Pre-punched hole.311. Notch; 312. Finished workpiece; 4. Feeding detection device; 401. Micro switch; 402. Detection pin; 403. Detection pin. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 13 As shown, the embodiment of the present invention includes an upper mold 1 and a lower mold 2. The upper mold 1 moves linearly up and down relative to the lower mold 2. The upper mold 1 is connected to the stamping slide of the stamping machine, and the lower mold 2 is connected to the working platform of the stamping machine. The protective cover continuous stretching stamping forming mold includes multiple stamping steps, which are arranged in the following order: left and right side profile trimming, front and rear side profile trimming, first stretching, second stretching, side punching of left side round hole, side punching of right side round hole, side punching of irregular hole, straight punching of irregular hole, notch punching, and finished product blanking.

[0019] The upper die 1 is provided with left and right side profile trimming upper die 101, front and rear side profile trimming upper die 102, first stretching upper die 103, second stretching upper die 104, side punching left side round hole upper die 105, side punching right side round hole upper die 106, side punching irregular hole upper die 107, straight punching irregular hole upper die 108, notch punching upper die 110 and blanking upper die 111, which correspond to multiple stamping steps in sequence. The lower die 2 is provided with left and right side profile trimming lower die 201, front and rear side profile trimming lower die 202, first stretching lower die 203, second stretching lower die 204, side punching left round hole lower die 205, side punching right round hole lower die 206, side punching irregular hole lower die 207, straight punching irregular hole lower die 208, notch punching lower die 210 and blanking lower die 211, which correspond to multiple stamping steps in sequence.

[0020] The upper die 101 for cutting the outer contour of the left and right sides includes left and right side cutting punches 1011 and pin insertion punches 1012. Two pin insertion punches 1012 are provided, respectively located on the front and rear sides of the left and right side cutting punches 1011 and on the front and rear sides of the workpiece strip 3. The lower die 201 for cutting the outer contour of the left and right sides includes left and right side cutting dies 2011. The left and right side cutting dies 2011 are provided with pin insertion die holes 2012. There are two holes 2012, which correspond to two insert punches 1012 respectively. During operation, the left and right side profile cutting punches 1011 move down and cooperate with the left and right side profile cutting dies 2011 to punch out the left and right side profile holes 301 opposite to each pair of adjacent workpieces on the workpiece strip 3. The insert punches 1012 move down synchronously and cooperate with the insert die holes 2012 to punch out the positioning holes 302 for subsequent stamping on the front and rear sides of the workpiece strip 3. The upper die 1 has multiple working positions on the front and rear sides of the workpiece strip 3, each equipped with a pin 113 and a pressure rod 112. The pin 113 is used to insert into the corresponding positioning hole 302 on the workpiece strip 3 during subsequent stamping steps. The pressure rod 112 is located on the left and / or right side of the pin 113. The upper end of the pressure rod 112 is equipped with a compression spring, which is used to press the workpiece strip 3 during stamping. The pin 113 and the pressure rod 112 are used to prevent the workpiece strip 3 from being misaligned or deformed.

[0021] The upper die 102 for cutting the front and rear outer contours includes two front and rear outer contour cutting punches 1021, which are symmetrically arranged on the front and rear sides of the workpiece strip 3. The lower die 202 for cutting the front and rear outer contours includes two symmetrical front and rear outer contour cutting dies 2021. During operation, the front and rear outer contour cutting punches 1021 move downward and cooperate with the front and rear outer contour cutting dies 2021 to punch out the front and rear outer contour holes 303 of the workpiece strip 3.

[0022] The primary stretching upper die 103 includes a first fixed die 1031 and a first movable die 1032. The primary stretching lower die 203 includes a first stretching punch 2031. The first movable die 1032 and the first fixed die 1031 are connected in a vertically movable manner. A first lifting mechanism is provided below the first stretching punch 2031 so that the first stretching punch 2031 can move vertically. During operation, the upper die 1 moves down to the lower end face of the first fixed die 1031 and fits against the upper plane of the workpiece strip 3. The lower plane of the first movable die 1032 fits against the upper plane of the first stretching punch 2031. The first lifting mechanism drives the first stretching punch 2031 and the first movable die 1032 to move upward in a straight line synchronously, thus obtaining the workpiece stretch shell 304 in one step. The secondary stretching upper die 104 includes a second fixed die 1041 and a second movable die 1042. The secondary stretching lower die 204 includes a second stretching punch 2041. The second movable die 1042 and the second fixed die 1041 are connected in a vertically movable manner. A second lifting mechanism is provided below the second stretching punch 2041 so that the second stretching punch 2041 can move vertically. During operation, the upper die 1 moves downward to the lower end face of the second fixed die 1041 and fits against the upper plane of the workpiece strip 3. The lower plane of the second movable die 1042 fits against the upper plane of the second stretching punch 2041. The second lifting mechanism drives the second stretching punch 2041 and the second movable die 1042 to move upward in a straight line synchronously, thus obtaining the secondary extension shell 305 with steps on the workpiece.

[0023] The side punch upper die 105 for the left circular hole includes a first inserter 1051, a first slide plate 1052, a first slider 1053, a second slider 1054, a first fixing plate 1057, a first side punch 1055, and a first cylinder 1056. Two first slide plates 1052 are provided, arranged parallel and symmetrically. The symmetrical plane of the two first slide plates 1052 is in the same plane as the axis of the workpiece's inner cavity. The opposite sides of the two first slide plates 1052 are provided with first slide grooves 10521 parallel to the symmetrical plane. The first slider 1053 and the second slider 1054 are... The fixed connection is disassembled. The first slider 1053 and the second slider 1054 have outwardly extending first protrusions 10531 and second protrusions 10541 on their sides corresponding to the positions of the first slide groove. The protrusions on both sides of the first slider 1053 and the second slider 1054 are inserted into the corresponding first slide grooves 10521, forming a linearly movable connection with the first slide groove plate 1052. Two first side punches 1055 are provided, symmetrically arranged on both sides of the symmetrical plane within the first slider 1053 and the second slider 1054, with their axes parallel to the symmetrical plane. The first cylinder 10... 56 has two parts, symmetrically arranged inside the first slider 1053 and the second slider 1054, outside the two first side punches 1055, with their axes parallel to the plane of symmetry. The first fixing plate 1057 is perpendicular to the plane of symmetry and is located on the outside of the workpiece shell at the position of the left side circular hole to be punched. The first fixing plate 1057 has a first arc groove 10571 in the middle of the side near the workpiece end. The lower end of the first arc groove 10571 has a first groove 10572 that matches the shape of the workpiece. During operation, the first groove 10572 fits into the workpiece shell. The first fixing plate 105... The side of the workpiece is fixedly connected to the piston rod end of the first cylinder 1056. The first inserter 1051 can move vertically relative to the first slide plate 1052. The lower end face of the first inserter 1051 facing the first slider 1053 is set as the first inclined surface. The outer end of the first slider 1053 is provided with a second inclined surface that cooperates with the first inclined surface. The first inclined surface and the second inclined surface fit together to form a first wedge. The side punching left circular hole upper die 105 is provided with two pieces. The two pieces are symmetrically arranged on the front left side and the rear left side of the workpiece, and are used to punch the four left circular holes 306 on the front left side and the rear left side of the workpiece shell. The side punch lower die 205 for the left circular hole includes a first side punch die holder 2051 and a first side punch die 2052. The first side punch die holder 2051 is set inside the workpiece cavity during punching. The front, left and rear three sides have the same shape as the inner shape of the workpiece cavity. The right side is set as a vertical cutting plane. There are two first side punch dies 2052, which are respectively set in the front and rear sides of the first side punch die holder 2051 and the corresponding positions of the first side punch punch 1055. A third lifting mechanism is provided below the first side punch die holder 2051 so that the first side punch die holder 2051 and the first side punch die 2052 can move vertically in a straight line. During operation, the third lifting mechanism drives the first side punch die holder 2051 and the first side punch die 2052 to rise and enter the inner cavity of the workpiece until the outer surfaces of the first side punch die holder 2051 and the first side punch die 2052 are in contact with the inner side wall of the inner cavity of the workpiece. The upper die 1 descends to the lower end face of the first slide plate 1052 and is in contact with the upper plane of the workpiece strip 3. The first inserter 1051 continues to descend and pushes the first slider 1053 and the second slider 1054 to move towards the workpiece with the two first side punches 1055. They cooperate with the first side punch die 2052 to punch out two left-side round holes 306 on the left side of the front and rear side walls of the workpiece shell. After the punching is completed, the first cylinder 1056 is started, which drives the first slider 1053, the second slider 1054 and the first side punches 1055 to reset. The upper die 106 and lower die 206 of the right side punch round hole are structurally identical to the upper die 105 and lower die 205 of the left side punch round hole, and are arranged symmetrically to the upper die 105 and lower die 205 of the left side punch round hole. The upper die 106 of the right side punch round hole includes a second insert, a second slide plate, a third slider, a fourth slider, a second fixing plate, a second side punching pin, and a second cylinder. The lower die 206 of the right side punch round hole includes a second side punching die base 2061 and a second side punching die 2062. A fourth lifting mechanism is provided below the second side punching die base 2061, so that the second side punching die base 2061 and the second side punching die 2062 can move vertically. During operation, the fourth lifting mechanism drives the second side punch die holder 2061 and the second side punch die 2062 to rise and enter the inner cavity of the workpiece until the outer surfaces of the second side punch die holder 2061 and the second side punch die 2062 are in contact with the inner side wall of the inner cavity of the workpiece. The upper die 1 descends to the lower end face of the second slide plate and is in contact with the upper plane of the workpiece strip 3. The second inserter continues to descend and pushes the third slider and the fourth slider to move towards the workpiece with the two second side punches, cooperating with the second side punch die 2062 to punch out two right-side round holes 307 on the right side of the front and rear side walls of the workpiece shell. After the punching is completed, the second cylinder is started, driving the third slider, the fourth slider, and the second side punches to reset.

[0024] The side-punching die 107 for irregular holes includes a third inserter 1071, a third slide plate 1072, a fifth slider 1073, a sixth slider 1074, a third fixing plate 1077, an irregular hole side punch 1075, and a third cylinder 1076. Two third slide plates 1072 are provided, parallel and symmetrically arranged. The symmetrical plane of the two third slide plates 1072 is in the same longitudinal plane as the axis of the workpiece's inner cavity. The opposite sides of the two third slide plates 1072 are provided with third slide grooves 10721 parallel to the symmetrical plane. The fifth slider 1073, the sixth slider 1074, the fifth slide plate 1075, the sixth slider 1076, the sixth slider 1077, the seventh slide plate 1077, the seventh slide plate 1078, the ninth slide plate 1079, the tenth slide plate 1070, the eleventh slide plate 1071, the eleventh slide plate 1072 ... The six sliders 1074 have outwardly extending fifth bosses 10731 and sixth bosses 10741 on both sides corresponding to the third slide groove 10721. The bosses on both sides of the fifth slider 1073 and the sixth slider 1074 are inserted into the corresponding third slide grooves 10721, forming a linearly movable connection with the third slide groove plate 1072. The irregular hole side punch 1075 is disposed in the fifth slider 1073 and the sixth slider 1074. The longitudinal center plane of the irregular hole side punch 1075 coincides with the symmetry plane. The third cylinder 107 6. Two pieces are provided, symmetrically arranged on both sides of the punch head 1075 on the irregular hole side inside the fifth slider 1073 and the sixth slider 1074, with their axes parallel to the plane of symmetry. The third fixing plate 1077 is perpendicular to the plane of symmetry of the two third sliding plates 1072 and is located on the outside of the workpiece shell at the position where the irregular hole is to be punched. The third fixing plate 1077 has a third arc groove 10771 in the middle near the workpiece end. The lower end of the third arc groove 10771 has a third groove that matches the shape of the workpiece. During operation, the third groove fits against the workpiece shell. The third fixing plate 1077 is located away from the workpiece. The side of the workpiece is fixedly connected to the piston rod end of the third cylinder 1076. The third inserter 1071 can move vertically up and down relative to the third slide plate 1072. The lower end face of the third inserter 1071 is set as the fifth inclined surface facing the fifth slider 1073. The upper side of the outer end of the fifth slider 1073 is provided with a sixth inclined surface that cooperates with the fifth inclined surface. The fifth inclined surface and the sixth inclined surface fit together to form the third inclined wedge. The side punching die 107 is provided with two pieces. The two pieces are symmetrically arranged in the middle of the front and rear sides of the workpiece and are used to punch the upper part 308 of the two irregular holes in the middle of the front and rear side walls of the workpiece. The side-punching die 207 includes a side-punching die base 2071 and a side-punching die 2072. The side-punching die base 2071 is set inside the workpiece cavity during punching. The front, left and rear sides have the same shape as the inner cavity of the workpiece. The right side is set as a vertical cutting plane. There are two side-punching dies 2072, which are respectively set in the front and rear sides of the side-punching die base 2071 and the corresponding positions of the side-punching punch 1075. A fifth lifting mechanism is provided below the side-punching die base 2071 so that the side-punching die base 2071 and the side-punching die 2072 can move vertically. During operation, the fifth lifting mechanism drives the irregular hole side punch die holder 2071 and irregular hole side punch die 2072 to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner side wall of the workpiece cavity. The upper die 1 descends to the lower end face of the third slide plate 1072 and is in contact with the upper plane of the workpiece strip 3. The third inserter 1071 continues to descend and pushes the fifth slider 1073 and the sixth slider 1074 to move the irregular hole side punch head 1075 toward the workpiece. It cooperates with the irregular hole side punch die 2072 to punch out the upper part 308 of two irregular holes on the front and rear side walls of the workpiece. After the punching is completed, the third cylinder 1076 is started, which drives the fifth slider 1073, the sixth slider 1074 and the irregular hole side punch head 1075 to reset.

[0025] The upper die 108 for punching irregular holes includes two punches 1081 for punching irregular holes, which are symmetrically arranged on the front and rear sides of the workpiece. The lower die 208 for punching irregular holes includes a first workpiece positioning seat 2081 and a die 2082 for punching irregular holes. The first workpiece positioning seat 2081 is positioned inside the workpiece cavity during punching. The front, right, and rear sides have the same shape as the workpiece cavity. The left side is a vertical cutting plane. The front and rear sides of the first workpiece positioning seat 2081 are provided with clearance notches corresponding to the positions of the punches 1081 for punching irregular holes. The die 2082 for punching irregular holes is provided in two pieces, which are respectively arranged on the front and rear sides of the workpiece corresponding to the positions of the punches 1081 for punching irregular holes. A sixth lifting mechanism is provided below the first workpiece positioning seat 2081, which allows the first workpiece positioning seat 2081 to move vertically. During operation, the sixth lifting mechanism drives the first workpiece positioning seat 2081 to rise until the outer side of the first workpiece positioning seat 2081 is in contact with the inner wall of the workpiece cavity. The irregular hole punch 1081 descends and cooperates with the irregular hole punch die 2082 to punch out the lower part of the irregular hole on the front and rear flanges of the workpiece, so that the upper part of the irregular hole and the lower part of the irregular hole are smoothly connected, and a complete irregular hole 309 is obtained.

[0026] The protective cover continuous stretching stamping forming die also includes a pre-punching step, which is located between the straight punching of irregular holes and the notch punching step. It is used to prevent deformation of the workpiece during notch punching. The pre-punching step and the straight punching of irregular holes are located at the same station. The upper die 1 is provided with a pre-punching upper die 109, which includes a pre-punching punch 1091. The pre-punching punch 1091 is located at the notch to be punched on the right side of the workpiece. The lower die 2 is provided with a pre-punching lower die 209, which includes a pre-punching die 2091. The pre-punching die 2091 is embedded in the first workpiece positioning seat 2081 at a position corresponding to the pre-punching punch 1091. During operation, the first workpiece positioning seat 2081, along with the pre-punching die 2091, rises to the outer side and fits against the inner wall of the workpiece cavity. The pre-punching punch 1091 descends and cooperates with the pre-punching die 2091 to punch out a pre-punched hole 310 on the right side of the upper side wall of the workpiece.

[0027] The upper blanking die 111 includes a blanking punch 1111, and the lower blanking die 211 includes a third workpiece positioning seat 2111 and a blanking die 2112. The third workpiece positioning seat 2111 is located on the left side of the upper plane of the blanking die 2112 and is located in the inner cavity of the workpiece during stamping. The front, left and rear sides have the same shape as the inner cavity of the workpiece, and the right side is a vertical cutting plane. An eighth lifting mechanism is provided below the blanking die 2112 so that the blanking die 2112 can move up and down linearly. During operation, the eighth lifting mechanism drives the blanking die 2112 and the third positioning seat 2111 to rise until the outer side of the third workpiece positioning seat 2111 is in contact with the inner wall of the workpiece cavity. The blanking punch 1111 descends and cooperates with the blanking die 2112 to cut off the excess material strip between the front and rear sides of two adjacent workpieces. Each workpiece is punched once on the left and right sides to obtain the final complete workpiece product 312.

[0028] The upper notch punching die 110 includes a notch punching punch 1101, and the lower notch punching die 210 includes a notch punching die 2102 and a second workpiece positioning seat 2101. A through groove is provided on the lower die plate of the lower die 2, corresponding to the positions of the lower notch punching die 210 and the blanking die 211. The notch punching die 2102 is embedded in the left side of this through groove. The second workpiece positioning seat 2101 is located in the middle of the right side of the notch punching die 2102, and is positioned inside the workpiece cavity during stamping. The front, left, and rear three sides of the workpiece have the same shape as the workpiece cavity. The right side is set as a vertical cutting plane, which is in the same plane as the right side of the notch punching die 2102. A seventh lifting mechanism is provided below the second workpiece positioning seat 2101, so that the second workpiece positioning seat 2101 can move up and down linearly. The blanking die 2112 is located on the right side of the through groove on the lower template. The notch punching die cavity 2103 is formed between the right side of the notch punching die 2102, the right cutting plane of the second workpiece positioning seat 2101, the left side of the blanking die 2112 and the front and rear side walls of the through groove. During operation, the seventh lifting mechanism drives the second workpiece positioning seat 2101 to rise until the outer side of the second workpiece positioning seat 2101 is in contact with the inner wall of the workpiece cavity. The upper die 1 moves downward, driving the notch punching punch 1101 to move downward and cooperate with the notch punching die cavity 2103 to punch the notch 311 on the right side of the workpiece.

[0029] This embodiment of the invention also includes a feeder and a feeding detection device 4. The feeder is used to convey the workpiece strip 3 to the right at equal distances (the distance between two adjacent workstations) once for each stamping of the continuous stretching and stamping forming die of the protective cover. The feeding detection device 4 includes a micro switch 401, a detection pin 402 and a detection pin 403. The micro switch 401 and the detection pin 403 are both fixedly connected to the upper die 1. The outer side of the upper end of the detection pin 403 is provided with an annular arc groove 4031. One end of the detection pin 402 is fixedly connected to one side of the micro switch 401, and the other end is provided with a hemispherical head 4021. The hemispherical head 4021 cooperates with the annular arc groove 4031 and is inserted into the annular arc groove 4031. The micro switch 401 is communicatively connected to the power controller. During operation, the upper mold 1 moves downward, driving the detection pin 403, micro switch 401, and detection pin 402 to move downward synchronously. When the workpiece strip 3 is fed crookedly or not in place, the detection pin 403 will not be able to move downward and insert into the positioning hole 302, while the detection pin 402 continues to move downward. The annular arc groove 4031 and the hemispherical head 4021 of the detection pin 402 are misaligned, which will push the detection pin 402 to touch the micro switch 401. The micro switch 401 sends the detection information to the power controller, and the power controller controls the circuit to cut off the power, thereby protecting the mold and the stamping machine.

[0030] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A continuous stretching and stamping die for a protective cover, comprising an upper die and a lower die, wherein the upper die moves linearly up and down relative to the lower die, the upper die is connected to a stamping slide of a stamping machine, and the lower die is connected to a working platform of the stamping machine, characterized in that: The protective cover continuous stretching and stamping forming die includes multiple stamping steps, which are arranged in the following order: left and right side profile trimming, front and rear side profile trimming, first stretching, second stretching, side punching left side round hole, side punching right side round hole, side punching irregular hole, straight punching irregular hole, notch punching and finished product blanking. The upper die is provided with left and right side profile trimming upper dies, front and rear side profile trimming upper dies, first stretching upper die, second stretching upper die, side punch left round hole upper die, side punch right round hole upper die, side punch irregular hole upper die, straight punch irregular hole upper die, notch punching upper die and blanking upper die, which correspond to multiple stamping steps in sequence. The lower die is provided with left and right side profile trimming lower dies, front and rear side profile trimming lower dies, first stretching lower die, second stretching lower die, side punching left round hole lower die, side punching right round hole lower die, side punching irregular hole lower die, straight punching irregular hole lower die, notch punching lower die and blanking lower die, which correspond to multiple stamping steps in sequence.

2. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The upper die for cutting the outer contours of the left and right sides includes left and right side cutting punches and insert punches. There are two insert punches, which are respectively located on the front and rear sides of the left and right side cutting punches. The lower die for cutting the outer contours of the left and right sides includes left and right side cutting dies. The left and right side cutting dies are provided with insert die holes. There are two insert die holes, which correspond to the two insert punches respectively. During operation, the left and right side cutting punches move down and cooperate with the left and right side cutting dies to punch out the left and right side contour holes of each pair of adjacent workpieces on the workpiece strip. The insert punches move down synchronously and cooperate with the insert die holes to punch out the positioning holes for subsequent stamping on the front and rear sides of the workpiece strip. The upper die has multiple working positions on the front and rear sides of the workpiece strip, each equipped with a pin and a pressure rod. The pin is used to insert into the corresponding positioning hole on the workpiece strip during subsequent stamping steps. The pressure rod is located on the left and / or right side of the pin, and each pressure rod has a compression spring at its upper end to press the workpiece strip during stamping. The pin and pressure rod are used to prevent the workpiece strip from being misaligned or deformed.

3. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The upper die for cutting the front and rear outer shapes includes two front and rear outer shape cutting punches, which are symmetrically arranged on the front and rear sides of the workpiece strip. The lower die for cutting the front and rear outer shapes includes two symmetrical front and rear outer shape cutting dies. During operation, the front and rear outer shape cutting punches move downward and cooperate with the front and rear outer shape cutting dies to punch out the front and rear outer shape holes of the workpiece strip.

4. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The first stretching upper die includes a first fixed die and a first movable die, and the first stretching lower die includes a first stretching punch. The first movable die and the first fixed die are connected in a vertically movable manner. A first lifting mechanism is provided below the first stretching punch so that the first stretching punch can move vertically. During operation, the upper die descends to the lower end face of the first fixed die and fits against the upper plane of the workpiece strip, while the lower plane of the first movable die fits against the upper plane of the first stretching punch. The first lifting mechanism drives the first stretching punch and the first movable die to move upward in a straight line synchronously, thus obtaining a workpiece shell after one stretching. The secondary stretching upper die includes a second fixed die and a second movable die, and the secondary stretching lower die includes a second stretching punch. The second movable die and the second fixed die are connected in a vertically movable manner. A second lifting mechanism is provided below the second stretching punch so that the second stretching punch can move vertically. During operation, the upper die descends to the lower end face of the second fixed die and fits against the upper plane of the workpiece strip. The lower plane of the second movable die fits against the upper plane of the second stretching punch. The second lifting mechanism drives the second stretching punch and the second movable die to move upward in a straight line synchronously, thus obtaining a secondary extension shell with steps on the workpiece.

5. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The side punch upper die for the left circular hole includes a first inserter, a first slide plate, a first slider, a second slider, a first fixing plate, a first side punch pin, and a first cylinder. Two first slide plates are provided, parallel and symmetrically arranged. The plane of symmetry of the two first slide plates is in the same plane as the axis of the workpiece's inner cavity. First slide grooves parallel to the plane of symmetry are provided on the opposite sides of the two first slide plates. The first slider and the second slider are detachably fixedly connected. Outwardly extending bosses are provided on both sides of the first slider and the second slider at positions corresponding to the first slide grooves. The bosses on both sides of the first slider and the second slider are inserted into the corresponding first slide grooves, forming a linearly movable connection with the first slide plate. Two first side punch pins are provided, symmetrically arranged on both sides of the plane of symmetry within the first and second sliders, with their axes parallel to the plane of symmetry. Two first cylinders are provided, symmetrically arranged on the first slide plate. The outer sides of the first side punches inside the block and the second slider are parallel to the plane of symmetry. The first fixed plate is perpendicular to the plane of symmetry and is located on the outer side of the workpiece shell at the position of the left side circular hole to be punched. The middle of the side of the first fixed plate near the workpiece end is provided with a first arc groove. The lower end of the first arc groove is provided with a first groove that is consistent with the shape of the workpiece. During operation, the first groove fits into the workpiece shell. The side of the first fixed plate far from the workpiece is fixedly connected to the end of the piston rod of the first cylinder. The first insert can move linearly up and down relative to the first slide plate. The lower end face of the first insert is provided with a first inclined surface facing the first slider. The outer end of the first slider is provided with a second inclined surface that cooperates with the first inclined surface. The first inclined surface and the second inclined surface fit together to form a first wedge. The upper die for the left side circular hole of the side punch is provided with two pieces. The two pieces are symmetrically arranged on the front left and rear left sides of the workpiece and are used to punch the four left side circular holes on the front left and rear left sides of the workpiece shell. The side punch lower die for the left circular hole includes a first side punch die holder and a first side punch die. The first side punch die holder is set inside the workpiece cavity during stamping. The front, left and rear three sides have the same shape as the inner shape of the workpiece cavity. The right side is set as a vertical cutting plane. There are two first side punch dies, which are respectively set in the front and rear sides of the first side punch die holder and the corresponding positions of the first side punch punch. A third lifting mechanism is provided below the first side punch die holder so that the first side punch die holder and the first side punch die can move vertically in a straight line. During operation, the third lifting mechanism drives the first side punch die holder and the first side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner side wall of the workpiece cavity. The upper die descends to the lower end face of the first slide plate and is in contact with the upper plane of the workpiece strip. The first inserter continues to descend and pushes the first slider and the second slider to move towards the workpiece with the two first side punches. They cooperate with the first side punch die to punch out four left-side round holes on the left side of the front and rear side walls of the workpiece shell. After the punching is completed, the first cylinder is started, which drives the first slider, the second slider, and the first side punches to reset. The upper and lower dies for the right circular hole of the side punch are structurally identical to the upper and lower dies for the left circular hole of the side punch, and are arranged symmetrically with the upper and lower dies for the left circular hole of the side punch. The upper die for the right circular hole of the side punch includes a second insert, a second slide plate, a third slider, a fourth slider, a second fixing plate, a second side punch, and a second cylinder. The lower die for the right circular hole of the side punch includes a second side punch die holder and a second side punch die. A fourth lifting mechanism is provided below the second side punch die holder, so that the second side punch die holder and the second side punch die can move vertically. During operation, the fourth lifting mechanism drives the second side punch die holder and the second side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner wall of the workpiece cavity. The upper die descends to the lower end face of the second slide plate and is in contact with the upper plane of the workpiece strip. The second inserter continues to descend, pushing the third slider and the fourth slider to move towards the workpiece with the two second side punch needles. They cooperate with the second side punch die to punch out four right-side round holes on the right side of the front and rear side walls of the workpiece shell. After the punching is completed, the second cylinder is started, driving the third slider, the fourth slider, and the second side punch needles to reset.

6. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The side-punching die for irregular holes includes a third inserter, a third slide plate, a fifth slider, a sixth slider, a third fixing plate, an irregular hole side punch, and a third cylinder. Two third slide plates are provided, parallel and symmetrically arranged. The symmetrical plane of the two third slide plates is in the same longitudinal plane as the workpiece's inner cavity axis. Third slide grooves parallel to the symmetrical planes are provided on the opposite sides of the two third slide plates. The fifth and sixth sliders have outwardly extending bosses on their sides corresponding to the third slide grooves. These bosses are inserted into the corresponding third slide grooves, forming a linearly movable connection with the third slide plates. The irregular hole side punch is located within the fifth and sixth sliders, with its longitudinal center plane coinciding with the symmetrical plane. Two third cylinders are provided, symmetrically arranged within the fifth and sixth sliders for the irregular hole side punch. On both sides of the punch, the axis is parallel to the plane of symmetry. The third fixed plate is perpendicular to the plane of symmetry of the two third sliding plates and is located on the outside of the workpiece shell at the position where the irregular hole is to be punched. The third fixed plate has a third arc groove in the middle of the side near the workpiece end. The lower end of the third arc groove has a third groove that is consistent with the shape of the workpiece. During operation, the third groove fits into the workpiece shell. The side of the third fixed plate far from the workpiece is fixedly connected to the end of the piston rod of the third cylinder. The third insert can move linearly up and down relative to the third sliding plate. The lower end face of the third insert is set as a fifth inclined surface facing the fifth slider. The upper side of the outer end of the fifth slider has a sixth inclined surface that matches the fifth inclined surface. The fifth inclined surface and the sixth inclined surface fit together to form a third inclined wedge. The upper die for punching irregular holes has two pieces. The two pieces are symmetrically located in the middle of the front and rear sides of the workpiece and are used to punch the upper part of the two irregular holes in the middle of the front and rear side walls of the workpiece. The side punching die for irregular holes includes a side punching die base and a side punching die. The side punching die base is placed inside the workpiece cavity during stamping. The front, left, and rear sides have the same shape as the inner cavity of the workpiece. The right side is a vertical cutting plane. There are two side punching dies, which are respectively installed in the front and rear sides of the side punching die base and correspond to the side punching head. A fifth lifting mechanism is provided below the side punching die base, so that the side punching die base and the side punching die can move vertically. During operation, the fifth lifting mechanism drives the irregular hole side punch die holder and irregular hole side punch die to rise and enter the inner cavity of the workpiece until the outer side surface is in contact with the inner side wall of the workpiece cavity. The upper die descends to the lower end face of the third slide plate and is in contact with the upper plane of the workpiece strip. The third inserter continues to descend, pushing the fifth slider and the sixth slider to move the irregular hole side punch head toward the workpiece. It cooperates with the irregular hole side punch die to punch out the upper part of two irregular holes on the front and rear side walls of the workpiece. After the punching is completed, the third cylinder is started, driving the fifth slider, the sixth slider and the irregular hole side punch head to reset.

7. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The upper die for punching irregular holes includes two punches for punching irregular holes, which are symmetrically arranged on the front and rear sides of the workpiece. The lower die for punching irregular holes includes a first workpiece positioning seat and a die for punching irregular holes. The first workpiece positioning seat is set inside the inner cavity of the workpiece during stamping. The front, right, and rear sides have the same shape as the inner cavity of the workpiece. The left side is set as a vertical cutting plane. The front and rear sides of the first workpiece positioning seat are provided with clearance notches corresponding to the positions of the punches for punching irregular holes. The die for punching irregular holes is provided in two pieces, which are respectively set on the front and rear sides of the workpiece and corresponding to the positions of the punches for punching irregular holes. A sixth lifting mechanism is provided below the first workpiece positioning seat, so that the first workpiece positioning seat can move vertically. During operation, the sixth lifting mechanism drives the first workpiece positioning seat to rise to the outer side and fit against the inner wall of the workpiece cavity. The irregular hole punch descends and cooperates with the irregular hole punch die to punch out the lower part of the irregular hole on the front and rear flanges of the workpiece, so that the upper part of the irregular hole and the lower part of the irregular hole are smoothly connected to obtain a complete irregular hole.

8. The protective cover continuous stretching stamping forming die according to claim 7, characterized in that: The protective cover continuous stretching stamping forming die includes a pre-punching step, which is located between the straight punching of irregular holes and the notch punching step to prevent deformation of the workpiece during notch punching. The pre-punching step and the straight punching of irregular holes are located at the same station. The upper die is provided with a pre-punching upper die, which includes a pre-punching punch. The pre-punching punch is located at the notch to be punched on the right side of the workpiece. The lower die is provided with a pre-punching lower die, which includes a pre-punching die. The pre-punching die is embedded in the first workpiece positioning seat at a position corresponding to the pre-punching punch. During operation, the first workpiece positioning seat, carrying the pre-punching die, rises to the outer side and fits against the inner wall of the workpiece cavity. The pre-punching punch descends and cooperates with the pre-punching die to punch a pre-punched hole on the right side of the upper wall of the workpiece.

9. The protective cover continuous stretching stamping forming die according to claim 1, characterized in that: The upper blanking die includes a blanking punch, and the lower blanking die includes a third workpiece positioning seat and a blanking die. The third workpiece positioning seat is located on the upper right side of the blanking die and is positioned inside the workpiece cavity during stamping. The front, left, and rear sides have the same shape as the workpiece cavity. The right side is a vertical cutting plane. An eighth lifting mechanism is provided below the blanking die, so that the blanking die can move up and down in a straight line. During operation, the eighth lifting mechanism drives the blanking die and the third positioning seat to rise to the outer side of the third workpiece positioning seat and fit against the inner wall of the workpiece cavity. The blanking punch descends and cooperates with the blanking die to cut off the excess material strip between the front and rear sides of two adjacent workpieces. Each workpiece is punched once on the left and right sides to obtain the final complete workpiece product.

10. A continuous stretching and stamping die for a protective cover according to claim 1, characterized in that: It also includes a feeder and a feeding detection device. The feeder is used to convey the workpiece strip to the right at equal intervals for each stamping of the continuous stretching and stamping die of the protective cover. The feeding detection device includes a micro switch, a detection pin, and a detection pin. The micro switch and the detection pin are both fixedly connected to the upper die. The outer surface of the upper end of the detection pin is provided with an annular arc groove. One end of the detection pin is fixedly connected to one side of the micro switch, and the other end is a hemispherical head. The hemispherical head cooperates with the annular arc groove and is inserted into the annular arc groove. The micro switch is communicatively connected to the power controller. During operation, the upper die descends, causing the detection pin, micro switch, and detection pin to descend synchronously. If the workpiece strip is fed crookedly or not in place, the detection pin will be unable to descend and insert into the positioning hole, while the detection pin continues to descend. The annular arc groove and the hemispherical head of the detection pin will misalign, pushing the detection pin to trigger the micro switch. The micro switch sends the detection information to the power controller, which then cuts off the power to the control circuit, thereby protecting the mold and the stamping machine.

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