CN115990646B - Waist-retraction squatting machine tool with top cylinder and forming method thereof - Google Patents

Abstract

The invention discloses a waisted squatting machine tool with a top cylinder and a forming method thereof, wherein the machine tool comprises an upper die part and a lower die part, the upper die part comprises an upper die seat, a limiting top plate, a movable top plate, an upper insert, a wedge and an upper ejector rod which are arranged on the upper die seat; the lower die part comprises a lower die seat, a movable die plate, a radial waist-folding mechanism driven by the inclined wedge, a forming inner core, a lower seat, a positioning support column, a spring, a limiting plate, a first elastic support mechanism, a second elastic support mechanism, a first lower ejector rod and a second lower ejector rod. Firstly, a workpiece to be formed is sleeved on a forming inner core, and then the working procedures of clamping and positioning, waisting, squatting and discharging the workpiece can be sequentially completed in the process of once die assembly and die opening, so that the efficiency is greatly improved.

Description

Waist-retraction squatting machine tool with top cylinder and forming method thereof

Technical Field

The invention belongs to the technical field of mold process structures, and particularly relates to a waisted squatting machine tool with a top cylinder and a forming method thereof.

Background

The hollow cylindrical workpiece is subjected to waisting and squatting high forming, the existing forming mode is that waisting forming is firstly performed, squatting high forming is performed, 2 steps are needed to be completed, and a large error exists in positioning and clamping between the two steps, so that the dimension control of a product is not easy, and the reject ratio is high. The invention perfectly fuses the two steps together, and greatly ensures the yield. And the production efficiency is greatly improved because one step is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a waisted squatting machine tool with a top cylinder and a forming method thereof.

The invention is realized by the following technical scheme:

a waisted squatting machine tool with a top cylinder comprises an upper die part and a lower die part;

the upper die part comprises an upper die base, a limiting top plate, a movable top plate, an upper insert, a wedge and an upper ejector rod, wherein the limiting top plate, the movable top plate, the upper insert, the wedge and the upper ejector rod are arranged on the upper die base;

the lower die part comprises a lower die seat, a movable die plate, a radial waisting mechanism driven by the inclined wedge, a forming inner core, a lower seat, a positioning support column, a spring, a limiting plate, a first elastic support mechanism, a second elastic support mechanism, a first lower ejector rod and a second lower ejector rod;

the movable template is arranged above the lower die seat through a first elastic supporting mechanism, and a certain gap exists between the movable template and the lower die seat under the action of the first elastic supporting mechanism in a natural state; the movable template is provided with a mounting hole, the lower-type seat is arranged in the mounting hole in a penetrating way, the upper part of the lower-type seat is provided with a groove, the forming inner core is movably arranged in the groove of the lower-type seat, and a spring is arranged between the lower-type seat and the forming inner core; the diameter of the upper part of the forming inner core is smaller than that of the lower part of the forming inner core, when a workpiece to be formed is sleeved into the forming inner core, the lower part of the forming inner core can play a role in positioning the inner wall of the lower part of the workpiece, and the upper part of the forming inner core is a workpiece and can be waisted; the bottom of the lower seat is provided with a stepped base with an expanded diameter, the top end of the positioning support column is vertically arranged and fixedly connected with the forming inner core, the bottom end of the positioning support column is provided with an expanded diameter round table, the expanded diameter round table at the bottom end of the positioning support column is movably arranged in a limit groove in the lower die holder, the depth of the limit groove is greater than the height of the expanded diameter round table, a limit plate is fixedly arranged on the limit groove, and the positioning support column penetrates through the limit plate; the second elastic supporting mechanism is arranged in the lower die holder and positioned below the positioning supporting column, and plays an upward elastic supporting role on the positioning supporting column; the radial waist-bending mechanism is arranged on the movable template; the first lower ejector rod is vertically and movably arranged in the lower die holder, the top end of the first lower ejector rod is positioned at the bottom of the stepped base of the lower die holder, and the bottom end of the first lower ejector rod is connected with the top cylinder of the machine tool; the second lower ejector rod is also vertically movably arranged in the lower die holder, the bottom end of the second lower ejector rod is also connected with a top cylinder of the machine tool, and the second lower ejector rod and the upper ejector rod on the upper die holder are positioned on the same straight line.

In the above technical scheme, a first limit bolt is connected between the movable top plate and the limit top plate and used for limiting the limit position of the movable top plate which is ejected downwards by the first spring mechanism; a second limit bolt is connected between the upper insert and the limit top plate and used for limiting the limit position of the upper insert which is ejected downwards by the second spring mechanism.

In the technical scheme, a vertical guide rod is further arranged between the upper insert and the limiting top plate, so that the upper insert can vertically and stably move linearly along the guide rod.

In the technical scheme, the periphery of the upper insert is provided with the inclined plane, so that the inner wall of the top of the workpiece to be formed can be positioned; the inclined wedge is fixedly arranged at the bottom of the upper die holder through a bolt; the upper ejector rod is vertically and downwards fixedly arranged on the upper die holder.

In the above technical scheme, the radial waisting mechanism comprises a mounting frame, and a wedge-shaped block, a waisting punch and a reset spring which are arranged on the mounting frame, wherein the waisting punch is connected with the wedge-shaped block, when an upper die holder drives a wedge to move downwards to the position above the wedge-shaped block of the radial waisting mechanism and to be contacted with the wedge-shaped block, the wedge triggers the wedge-shaped block to move horizontally to the direction of a forming inner core along with the continued downwards movement of the upper die holder, so that waisting of a workpiece sleeved on the forming inner core is realized; the return spring is connected with the wedge-shaped block and provides horizontal outward restoring force for the wedge-shaped block.

In the technical scheme, the springs are sleeved on the positioning support columns, and the mounting cavities for placing the springs are formed in the lower-type seats.

In the technical scheme, the movable template is provided with the first limiting column for limiting the minimum limiting distance between the movable template and the upper die holder.

In the technical scheme, the second limiting column is arranged on the lower die holder and used for limiting the downward limit movement position of the upper die holder.

The method for forming the workpiece by the waisted squatting machine tool with the top cylinder comprises the following steps:

step 1: adjusting the machine tool to an initial state; in the state, the upper die holder is positioned at the upper dead point, the top cylinder of the machine tool is positioned in an upward extending state, and the first lower ejector rod supports the lower die holder, so that the lower die holder is positioned at an upward limiting position;

step 2: sleeving a workpiece to be formed on a forming inner core and mounting the workpiece on a lower seat, and then adjusting a machine tool to a compacting and positioning state of the workpiece to be formed;

in the step, the upper die holder moves downwards, an upper ejector rod on the upper die holder presses down a second lower ejector rod to compress a top cylinder of the machine tool, the top cylinder of the machine tool synchronously drives a first lower ejector rod to descend, after the first lower ejector rod descends, a lower seat loses the supporting effect of the first lower ejector rod, and under the action of a spring, the lower seat reaches the limit position of a limiting plate; simultaneously, in the downward movement process of the upper die holder, an upper insert on the upper die holder is contacted with the top inner wall of the workpiece and presses the workpiece downwards, and the movable top plate applies downward pressure on the top surface of the workpiece, so that the workpiece to be molded is completely sleeved into the molding inner core downwards, and finally, the workpiece to be molded is positioned among the movable top plate, the upper insert, the molding inner core and the lower die seat;

step 3: waist-bending the workpiece;

in the step, the upper die holder continues to move downwards, and the wedge on the upper die holder triggers the radial waisting mechanism to enable a waisting punch of the radial waisting mechanism to horizontally move towards the direction of the forming inner core, so as to waisting a workpiece sleeved on the forming inner core; simultaneously, in the waisting process, the movable top plate and the upper insert always press down the workpiece, and the movable top plate and the upper insert move to the limit position of the limit top plate;

step 4: squatting the workpiece;

in the step, the upper die holder drives the movable die plate to synchronously move downwards; in the moving process, the movable top plate, the upper insert, the radial waisting mechanism and the forming inner core synchronously descend, and the lower seat is kept in situ due to the limit of the limiting plate, so that the squatting height of the workpiece is completed;

step 5: returning the machine tool to an initial state, and unloading the formed workpiece;

in the step, the upper die holder returns upwards, the top cylinder of the machine tool extends upwards, the lower base is driven upwards by the first lower ejector rod, and the lower base ejects the formed workpiece upwards to form the inner core; simultaneously, the movable top plate pushes down the molded workpiece under the drive of the first spring mechanism, so that the molded workpiece is separated from the upper insert.

The invention has the advantages and beneficial effects that:

the invention uses the machine tool cylinder and the upper and lower dies, successfully combines the working procedures, can sequentially complete the working procedures of clamping and positioning, waisting, squatting and discharging the workpiece in the process of once die assembly and die opening, and greatly improves the efficiency.

Drawings

Fig. 1 is a schematic diagram of an initial state of a squatting machine with a top cylinder.

Fig. 2 is a partial schematic view of the inventive machine tool with top cylinder in an initial state.

Fig. 3 is a schematic diagram of a workpiece compacting and positioning state of the waisted squatting high machine tool with the top cylinder.

Fig. 4 is a schematic diagram of the waisted state of the waisted squatting machine tool with the top cylinder.

Fig. 5 is a schematic view of squat height state of the waisted squat height machine tool with the top cylinder.

Fig. 6 is a schematic diagram of a workpiece after forming the workpiece by the waisted squatting machine tool with the top cylinder.

Other relevant drawings may be made by those of ordinary skill in the art from the above figures without undue burden.

Detailed Description

In order to make the person skilled in the art better understand the solution of the present invention, the following describes the solution of the present invention with reference to specific embodiments.

Referring to fig. 1 and 2, a squatting machine with a top cylinder comprises an upper die part and a lower die part.

The upper die part comprises an upper die holder 1, a limit top plate 2, a movable top plate 3, an upper insert 4, a wedge 5 and an upper ejector rod 19 (the upper ejector rod 19 is shown in the attached drawing 2), wherein the limit top plate 2 is fixedly arranged in a groove on the bottom surface of the upper die holder 1, the movable top plate 3 is positioned below the limit top plate 2, the movable top plate 3 is arranged on the upper die holder 1 through a first spring mechanism 31, and when the movable top plate 3 is acted by upward force, the movable top plate 3 can move to the limit top plate 2 above the movable top plate 3; the upper mold insert 4 is vertically and slidably embedded in the movable top plate 3, the upper mold insert 4 is connected with the upper mold base 1 above the upper mold insert 4 through a second spring mechanism 32, the upper mold insert 4 is used for acting on the inner wall of the top of a workpiece to be molded, and the periphery of the upper mold insert 4 is provided with a 45-degree inclined plane, so that the inner wall of the top of the workpiece to be molded can be positioned; the inclined wedge 5 is fixedly arranged at the bottom of the upper die holder 1 through bolts; the upper ejector rod 19 is vertically and downwards fixedly arranged on the upper die holder 1.

A first limit bolt 41 is connected between the movable top plate 3 and the limit top plate 2 and used for limiting the limit position of the movable top plate 3 ejected downwards by the first spring mechanism 31; a second limit bolt 42 is connected between the upper insert 4 and the limit top plate 2, and is used for limiting the limit position of the upper insert 4 ejected downwards by the second spring mechanism 32.

Further, preferably, a vertical guide rod 50 is further disposed between the upper mold insert 4 and the limiting top plate 2, so as to ensure that the upper mold insert 4 can move vertically stably and linearly along the guide rod.

The lower die part comprises a lower die seat 6, a movable die plate 7, a radial waisting mechanism 8 driven by the inclined wedge 5, a forming inner core 9, a lower base 10, a positioning support column 11, a spring 12, a limiting plate 13, a first elastic support mechanism 15, a second elastic support mechanism 16, a first lower ejector rod 18.1 and a second lower ejector rod 18.2.

The movable die plate 7 is arranged above the lower die holder 6 through a first elastic supporting mechanism 15, and under the action of the first elastic supporting mechanism 15, a certain gap exists between the movable die plate 7 and the lower die holder 6 in a natural state, and the gap prepares for squatting height of parts in the last step (which will be described later); a mounting hole is formed in the center of the movable template 7, the lower-type seat 10 is installed in the mounting hole in a penetrating manner, a groove 10.1 is formed in the upper portion of the lower-type seat 10, the forming inner core 9 is movably installed in the groove 10.1 of the lower-type seat 10, a spring 12 is arranged between the lower-type seat 10 and the forming inner core 9, and acting force which is far away from each other is provided for the lower-type seat 10 and the forming inner core 9 through the spring 12; the diameter of the upper part of the forming inner core 9 is smaller than that of the lower part of the forming inner core 9, when a workpiece to be formed is sleeved into the forming inner core 9, the lower part of the forming inner core 9 can play a role in positioning the inner wall of the lower part of the workpiece, and the diameter of the upper part of the forming inner core 9 is small, so that the workpiece can be subjected to waisting forming; the bottom of the lower seat 10 is provided with a stepped base 10.2 with an expanded diameter, and the diameter of the stepped base 10.2 is larger than the diameter of a mounting hole of the movable template 7, so that the stepped base 10.2 limits the upper limit position of the lower seat 10; the positioning support column 11 is vertically arranged, the top end of the positioning support column 11 is fixedly connected with the forming inner core 9, the bottom end of the positioning support column is provided with the diameter-enlarging round table 11.1, the diameter-enlarging round table 11.1 at the bottom end of the positioning support column 11 is movably arranged in a limiting groove 17 in the lower die holder 6, the depth of the limiting groove 17 is larger than the height of the diameter-enlarging round table 11.1, the limiting plate 13 is fixedly arranged on the limiting groove 17, the positioning support column 11 penetrates through the limiting plate 13, under the limiting effect of the limiting plate 13 on the diameter-enlarging round table 11.1, the upward limit position of the positioning support column 11, namely the upward limit position of the forming inner core 9 (because the forming inner core 9 is fixedly connected to the top end of the positioning support column 11), so that the forming inner core 9 cannot be pulled out upwards even if the spring 12 provides a mutually far acting force for the lower die holder 10 and the forming inner core 9; the second elastic supporting mechanism 16 is arranged in the lower die holder 6 and positioned below the positioning supporting column 11, and plays an upward elastic supporting role on the positioning supporting column 11; the radial waisting mechanism 8 is arranged on the movable template 7, the radial waisting mechanism 8 can be driven by the inclined wedge 5 to apply radial pushing force to the outer wall of the hollow cylindrical workpiece, and the workpiece is waisted; the first lower ejector rod 18.1 is vertically and movably arranged in the lower die holder 6, the top end of the first lower ejector rod 18.1 is positioned at the bottom of the step base 10.2 of the lower die holder 10 (the top end of the first lower ejector rod 18.1 is not connected with the bottom of the step base 10.2, but is positioned at the bottom of the step base 10.2), and the bottom end of the first lower ejector rod 18.1 is connected with a top cylinder of a machine tool; the second lower ejector rod 18.2 is also vertically and movably arranged in the lower die holder 6 (see fig. 2), the bottom end of the second lower ejector rod 18.2 is also connected with a top cylinder of the machine tool, and the top end of the second lower ejector rod 18.2 is connected with an intermediate rod 20; the second lower ejector rod 18.2 and the upper ejector rod 19 on the upper die holder 1 are positioned on the same straight line. When the upper die holder 1 moves downwards, the upper ejector rod 19 presses down the middle rod 20 and the second lower ejector rod 18.2 to compress the top cylinder of the machine tool, and the top cylinder is also connected with the first lower ejector rod 18.1, so that when the top cylinder of the machine tool compresses, the top cylinder of the machine tool synchronously drives the first lower ejector rod 18.1 to descend, after the first lower ejector rod 18.1 descends, the lower die seat 10 loses the supporting function of the first lower ejector rod 18.1, under the action of the spring 12, the spring 12 can press down the lower die seat 10, so that the lower die seat 10 reaches the limit position of the limit plate 13 (namely, the limit plate 13 is the lower limit position of the lower die seat 10), and at the moment, the upper die insert 4 and the lower die seat 10 press a workpiece to be formed upwards and downwards to stably position the workpiece; when the upper die holder 1 returns upwards, the top cylinder of the machine tool stretches out, so that the first lower ejector rod 18.1 drives the lower die holder 10 to move upwards, and the formed workpiece is ejected upwards for unloading.

Further, the radial waisting mechanism 8 comprises a mounting frame, a wedge block 8.1, a waisting punch 8.2 and a reset spring 8.3, wherein the wedge block 8.1 is arranged on the mounting frame, the waisting punch 8.2 is connected with the wedge block 8.1, when the upper die holder 1 drives the wedge 5 to move downwards to the position above the wedge block 8.1 of the radial waisting mechanism 8 and to be contacted with the wedge block, the wedge 5 triggers the wedge block 8.1 to move horizontally to the direction of the forming inner core 9 along with the movement of the upper die holder 1, so that waisting of a workpiece sleeved on the forming inner core 9 is realized; the reset spring 8.3 is connected with the wedge-shaped block 8.1, and provides horizontal outward restoring force for the wedge-shaped block 8.1, so that after the processing of the workpiece is completed, the waist-retracting punch 8.2 and the wedge-shaped block 8.1 can be reset after the upper die holder 1 returns.

Further, the spring 12 is sleeved on the positioning support column 11, and a mounting cavity for placing the spring 12 is arranged on the lower seat 10.

Further, a first limiting post 22 is disposed on the movable die plate 7, for limiting the minimum limiting distance between the movable die plate 7 and the upper die holder 1, so as to achieve two functions: limiting the limit triggering position of the wedge 5 to the radial waisting mechanism 8; secondly, after the upper die holder 1 contacts the first limit post 22, the upper die holder 1 drives the movable die plate 7 downwards along with the continuous downwards movement of the upper die holder 1 (in the process, the distance between the movable die plate 7 and the upper die holder 1 is unchanged), so as to finish squatting height of the workpiece.

Further, a second limiting post 21 (see fig. 2) is provided on the lower die holder 6 for limiting the downward limit movement position of the upper die holder 1, and at the same time limiting the downward limit movement position of the movable die plate 7 (because the movable die plate is driven downward by the upper die holder 1).

Further, the number of the wedge and the radial waisting mechanism 8 is determined according to the actual processing requirement, and only one group of wedge and radial waisting mechanism 8 is shown in the drawing of the embodiment.

The method for forming the workpiece by the waisted squatting machine tool with the top cylinder comprises the following steps:

step 1: the machine is brought to an initial state (i.e. the state shown in fig. 1).

In this state, the upper die holder 1 is at the top dead center position, the top cylinder of the machine tool is in an upwardly extending state, and the first lower ejector rod 18.1 supports the lower die holder 10, so that the lower die holder 10 is at an upwardly limit position.

Step 2: the workpiece 0 to be formed is fitted over the forming core 9 and mounted on the lower seat 10, and then the machine tool is adjusted to a press-positioning state (a state shown in fig. 3) of the workpiece to be formed.

Specifically, the method comprises the following steps: the upper die holder 1 moves downwards, an upper ejector rod 19 on the upper die holder 1 presses down the middle rod 20 and the second lower ejector rod 18.2 to compress a top cylinder of the machine tool, the top cylinder of the machine tool synchronously drives the first lower ejector rod 18.1 to descend, after the first lower ejector rod 18.1 descends, the lower die seat 10 loses the supporting function of the first lower ejector rod 18.1, and under the action of the spring 12, the lower die seat 10 reaches the limit position of the limiting plate 13; meanwhile, in the downward movement process of the upper die holder 1, the upper insert 4 on the upper die holder 1 is in contact with the top inner wall of the workpiece and presses down the workpiece 0, the movable top plate 3 can apply downward pressure on the top surface of the workpiece, the workpiece to be molded is completely sleeved into the molding inner core 9 downwards, and finally the workpiece to be molded is stably positioned among the movable top plate 3, the upper insert 4, the molding inner core 9 and the lower die seat 10, wherein the movable top plate 3 and the lower die seat 10 respectively press the top surface and the bottom surface of the workpiece to be molded, the upper insert 4 presses the top inner wall of the workpiece to be molded, and the inner wall of the lower part of the workpiece to be molded is positioned by the molding inner core 9.

Step 3: the workpiece is waisted (the state shown in fig. 4).

Specifically, the method comprises the following steps: the upper die holder 1 continues to move downwards, the wedge 5 on the upper die holder 1 triggers the radial waisting mechanism 8, so that the waisting punch 8.2 of the radial waisting mechanism 8 moves horizontally towards the forming inner core 9, and the workpiece 0 sleeved on the forming inner core 9 is waisted until the upper die holder 1 is contacted with the first limit post 22 on the movable die plate 7; meanwhile, in the waisting process, the movable top plate 3 and the upper insert 4 always press down the workpiece, and the movable top plate 3 and the upper insert 4 move to the limit position of the limit top plate 2.

Step 4: the work piece is squatted (the state shown in fig. 5).

Specifically, the method comprises the following steps: after the upper die holder 1 is contacted with a first limit post 22 on the movable die plate 7, the upper die holder 1 drives the movable die plate 7 to synchronously move downwards; in the moving process, the movable top plate 3, the upper insert 4, the radial waist-contracting mechanism 8 and the forming inner core 9 synchronously descend (as the bottom expanding round table 11.1 of the positioning support column 11 connected with the forming inner core 9 is movably arranged in the limiting groove 17, the depth of the limiting groove 17 is larger than the height of the expanding round table 11.1, the forming inner core 9 can descend), and the lower seat 10 is kept in situ due to the limiting of the limiting plate 13, so that the squat height of a workpiece is completed, namely, the height of the workpiece is reduced, and extrusion shaping is performed; the squat process is stopped until the upper die holder 1 reaches the second limit post 21 on the lower die holder 6.

Step 5: the machine returns to the initial state of fig. 1 and unloads the formed workpiece.

Specifically, the method comprises the following steps: the upper die holder 1 returns upwards, the top cylinder of the machine tool extends upwards, the lower die holder 10 is driven upwards by the first lower ejector rod 18.1, and the lower die holder 10 ejects the formed workpiece upwards to form the inner core 9; at the same time, the movable top plate 3 pushes down the molded workpiece under the drive of the first spring mechanism 31, so that the molded workpiece is smoothly separated from the upper insert 4. The final shaped workpiece is shown in figure 6.

The foregoing has described exemplary embodiments of the invention, it being understood that any simple variations, modifications, or other equivalent arrangements which would not unduly obscure the invention may be made by those skilled in the art without departing from the spirit of the invention.

Claims (9)

1. Take receipts waist lathe of squatting of top jar, its characterized in that: comprises an upper die part and a lower die part;

the upper die part comprises an upper die base, a limiting top plate, a movable top plate, an upper insert, a wedge and an upper ejector rod, wherein the limiting top plate, the movable top plate, the upper insert, the wedge and the upper ejector rod are arranged on the upper die base;

the lower die part comprises a lower die seat, a movable die plate, a radial waisting mechanism driven by the inclined wedge, a forming inner core, a lower seat, a positioning support column, a spring, a limiting plate, a first elastic support mechanism, a second elastic support mechanism, a first lower ejector rod and a second lower ejector rod;

the movable template is arranged above the lower die seat through a first elastic supporting mechanism, and a certain gap exists between the movable template and the lower die seat under the action of the first elastic supporting mechanism in a natural state; the movable template is provided with a mounting hole, the lower-type seat is arranged in the mounting hole in a penetrating way, the upper part of the lower-type seat is provided with a groove, the forming inner core is movably arranged in the groove of the lower-type seat, and a spring is arranged between the lower-type seat and the forming inner core; the diameter of the upper part of the forming inner core is smaller than that of the lower part of the forming inner core, when a workpiece to be formed is sleeved into the forming inner core, the lower part of the forming inner core can play a role in positioning the inner wall of the lower part of the workpiece, and the upper part of the forming inner core can retract the workpiece; the bottom of the lower seat is provided with a stepped base with an expanded diameter, the top end of the positioning support column is vertically arranged and fixedly connected with the forming inner core, the bottom end of the positioning support column is provided with an expanded diameter round table, the expanded diameter round table at the bottom end of the positioning support column is movably arranged in a limit groove in the lower die holder, the depth of the limit groove is greater than the height of the expanded diameter round table, a limit plate is fixedly arranged on the limit groove, and the positioning support column penetrates through the limit plate; the second elastic supporting mechanism is arranged in the lower die holder and positioned below the positioning supporting column, and plays an upward elastic supporting role on the positioning supporting column; the radial waist-bending mechanism is arranged on the movable template; the first lower ejector rod is vertically and movably arranged in the lower die holder, the top end of the first lower ejector rod is positioned at the bottom of the stepped base of the lower die holder, and the bottom end of the first lower ejector rod is connected with the top cylinder of the machine tool; the second lower ejector rod is also vertically movably arranged in the lower die holder, the bottom end of the second lower ejector rod is also connected with a top cylinder of the machine tool, and the second lower ejector rod and the upper ejector rod on the upper die holder are positioned on the same straight line.

2. The squatting pan with top cylinder according to claim 1, characterized in that: a first limit bolt is connected between the movable top plate and the limit top plate and used for limiting the limit position of the movable top plate which is ejected downwards by the first spring mechanism; a second limit bolt is connected between the upper insert and the limit top plate and used for limiting the limit position of the upper insert which is ejected downwards by the second spring mechanism.

3. The squatting pan with top cylinder according to claim 1, characterized in that: and a vertical guide rod is further arranged between the upper insert and the limiting top plate.

4. The squatting pan with top cylinder according to claim 1, characterized in that: the periphery of the upper insert is provided with an inclined plane, and the inner wall of the top of the workpiece to be formed is positioned; the inclined wedge is fixedly arranged at the bottom of the upper die holder through a bolt; the upper ejector rod is vertically and downwards fixedly arranged on the upper die holder.

5. The squatting pan with top cylinder according to claim 1, characterized in that: the radial waisting mechanism comprises a mounting frame, and a wedge-shaped block, a waisting punch and a reset spring which are arranged on the mounting frame, wherein the waisting punch is connected with the wedge-shaped block, when an upper die holder drives a wedge to move downwards to the position above the wedge-shaped block of the radial waisting mechanism and to be contacted with the wedge-shaped block, the wedge triggers the wedge-shaped block to move horizontally to the direction of a forming inner core along with the continued downwards movement of the upper die holder, so that waisting of a workpiece sleeved on the forming inner core is realized; the return spring is connected with the wedge-shaped block and provides horizontal outward restoring force for the wedge-shaped block.

6. The squatting pan with top cylinder according to claim 1, characterized in that: the spring is sleeved on the positioning support column, and a mounting cavity for placing the spring is arranged on the lower seat.

7. The squatting pan with top cylinder according to claim 1, characterized in that: the movable template is provided with a first limit column for limiting the minimum limit distance between the movable template and the upper die holder.

8. The squatting pan with top cylinder according to claim 1, characterized in that: the lower die holder is provided with a second limiting column for limiting the downward limit movement position of the upper die holder.

9. The method for forming the workpiece by the high-power waisted and squatted machine with the top cylinder as recited in claim 5, comprising the following steps:

step 1: adjusting the machine tool to an initial state; in the state, the upper die holder is positioned at the upper dead point, the top cylinder of the machine tool is positioned in an upward extending state, and the first lower ejector rod supports the lower die holder, so that the lower die holder is positioned at an upward limiting position;

step 2: sleeving a workpiece to be formed on a forming inner core and mounting the workpiece on a lower seat, and then adjusting a machine tool to a compacting and positioning state of the workpiece to be formed;

in the step, the upper die holder moves downwards, an upper ejector rod on the upper die holder presses down a second lower ejector rod to compress a top cylinder of the machine tool, the top cylinder of the machine tool synchronously drives a first lower ejector rod to descend, after the first lower ejector rod descends, a lower seat loses the supporting effect of the first lower ejector rod, and under the action of a spring, the lower seat reaches the limit position of a limiting plate; simultaneously, in the downward movement process of the upper die holder, an upper insert on the upper die holder is contacted with the top inner wall of the workpiece and presses the workpiece downwards, and the movable top plate applies downward pressure on the top surface of the workpiece, so that the workpiece to be molded is completely sleeved into the molding inner core downwards, and finally, the workpiece to be molded is positioned among the movable top plate, the upper insert, the molding inner core and the lower die seat;

step 3: waist-bending the workpiece;

in the step, the upper die holder continues to move downwards, and the wedge on the upper die holder triggers the radial waisting mechanism to enable a waisting punch of the radial waisting mechanism to horizontally move towards the direction of the forming inner core, so as to waisting a workpiece sleeved on the forming inner core; simultaneously, in the waisting process, the movable top plate and the upper insert always press down the workpiece, and the movable top plate and the upper insert move to the limit position of the limit top plate;

step 4: squatting the workpiece;

in the step, the upper die holder drives the movable die plate to synchronously move downwards; in the moving process, the movable top plate, the upper insert, the radial waisting mechanism and the forming inner core synchronously descend, and the lower seat is kept in situ due to the limit of the limiting plate, so that the squatting height of the workpiece is completed;

step 5: returning the machine tool to an initial state, and unloading the formed workpiece;

in the step, the upper die holder returns upwards, the top cylinder of the machine tool extends upwards, the lower base is driven upwards by the first lower ejector rod, and the lower base ejects the formed workpiece upwards to form the inner core; simultaneously, the movable top plate pushes down the molded workpiece under the drive of the first spring mechanism, so that the molded workpiece is separated from the upper insert.

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