A stripping plate opening and closing device for a drawing die

Abstract

The present invention discloses a stripper plate opening and closing device for a drawing die, which includes a first movable die assembly, an upper guide rod, a second movable die assembly slidable up and down and arranged on the upper guide rod, a fixed die assembly, a stripper assembly installed in the fixed die assembly, a locking member installed on the fixed die assembly that can be unlocked when the movable die portion is moving downward and is in a locked position when the movable die portion is moving upward, a plunger hung on the first movable die assembly and passed through the second movable die assembly, a limiting member installed on the second movable die assembly and first kept in a locked position during the upward movement of the second movable die assembly and then unlocked by the plunger to unlock the locking member, and the limiting member is connected to the second movable die assembly in a sliding direction toward and away from the plunger and is prohibited from being disengaged from the second movable die assembly in the upward direction. The stripper plate is fixed only at the time of stripping through a mechanical structure, that is, the advantages of a fixed stripper plate are maintained, and various stamping scenarios are adapted, the nitrogen spring requirements are low, and the structure is simplified.

Description

Technical Field

[0001] The invention relates to an opening and closing device for a stripping plate of a drawing die. Background Art

[0002] In the drawing die, after the deep drawing forming is completed, stripping is an indispensable function. Stripping includes two parts: one is the separation of the drawn product from the drawing circle, and the other is the separation of the drawing punch from the product. For the first type of stripping, the industry generally uses nitrogen springs or air ejector rods for stripping, which are simple and efficient in structure; for the second type of stripping, common ones include nitrogen spring stripping, fixed stripping plate stripping and upper die air ejector rod stripping. Nitrogen spring stripping is suitable for products that do not require a reset structure. For products that need to be reset, this stripping method requires the addition of a set of nitrogen springs with a greater force than the stripping force. Its function is to push the stripping plate open in advance to prevent the stripping force from crushing the product. The fixed stripping plate has a simple structure and is generally only used for stripping in pure drawing scenarios. The upper die air ejector rod is a supporting equipment for punch presses. This stripping method can only be achieved with a specific type of mold and a specific type of punch press, so its application is limited. Summary of the invention

[0003] The object of the present invention is to provide a stripping plate opening and closing device for a drawing die, which has a compact and simple structure and reduces the stripping force requirement of a nitrogen spring.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: a deep drawing die stripper plate opening and closing device, which includes a movable die part and a fixed die part, the movable die part includes a first movable die assembly, a plurality of upper guide rods fixed on the first movable die assembly, and a second movable die assembly slidable up and down and arranged on the upper guide rods, the fixed die part includes a fixed die assembly, a stripper assembly installed in the fixed die assembly, the fixed die part also includes a locking member installed on the fixed die assembly that can be unlocked when the movable die part is downward and is in a locked position when the movable die part is upward, the movable die part includes a plunger hung on the first movable die assembly and penetrated on the second movable die assembly, a limiting member installed on the second movable die assembly and first maintained in a locked position during the upward movement of the second movable die assembly and then unlocked by the plunger to unlock the locking member, the limiting member is connected to the second movable die assembly in a sliding direction toward and away from the plunger and is prohibited from being disengaged from the second movable die assembly in the up and down directions.

[0005] The first movable mold assembly includes a first upper movable module, and a first lower movable module fixed below the first upper movable module and spaced apart from the first upper movable module. When the insert knife is lifted up by the fixed mold part, it passes through the first lower movable module and abuts against the lower end surface of the first upper movable module after passing through the gap.

[0006] The side wall of the limiter is formed with an upper fitting surface, a lower fitting surface and a first inclined surface connected between the upper fitting surface and the lower fitting surface. A second inclined surface is formed between the side surface and the lower end surface of the inserting knife facing the limiter and cooperates with the first inclined surface to form a wedge-shaped surface. When the movable mold part moves upward and the lower fitting surface is fitted with the side surface of the inserting knife, the limiter is in a locked position and the locking member interferes with the limiter. When the movable mold part moves upward and the upper fitting surface is fitted with the side surface of the inserting knife, the limiter is in an unlocked position and the locking member is unlocked.

[0007] The locking member includes a lower guide rod which is slidable up and down and is arranged in the fixed mold part and is prohibited from being pulled out from the top of the fixed mold part, a locking tongue which is rotatably connected to the upper end part of the lower guide rod and can partially extend out of the lower guide rod after rotation and can interfere with the limiting member and then lock with the limiting member, and an elastic member connected to the locking tongue and the lower guide rod bracket so that the locking tongue always has a tendency to extend out of the lower guide rod.

[0008] The locking member includes a ball-head cylinder fixed on one end of the elastic member, an elastic blocking column fixed in the locking tongue and pressed against the other end of the elastic member, and an arc-shaped rotating shaft rotatably connected in the lower guide rod and used to rotatably connect the locking tongue and the lower guide rod, the rear end of the locking tongue is fixed in the arc-shaped rotating shaft, the elastic blocking column and the front end of the locking tongue are located on both sides of the arc-shaped rotating shaft and form a limit for the arc-shaped rotating shaft, and the lower end of the lower guide rod is connected to a fourth gasket and a fourth bolt to prevent the lower guide rod from being pulled out from above the fixed mold part.

[0009] The upper end of the insert is hung on the first lower moving module through a first gasket and a first bolt.

[0010] The lower end of the upper guide rod is connected with a second bolt and a second gasket to prevent the second movable mold assembly from sliding off the upper guide rod.

[0011] The upper end of the upper guide rod is connected with a third bolt and a third gasket for preventing the upper guide rod from sliding off the first movable mold assembly.

[0012] The first upper movable module includes, from top to bottom, an upper support plate and an upper mold foot that are fixedly connected; the first lower movable module includes, from top to bottom, an upper mold base, an upper pad, and a fixed plate that are fixedly connected to the upper mold foot, and a gap is formed between the upper mold base and the upper support plate. The second movable mold assembly includes, from top to bottom, a stripping back plate and a stripping plate that are fixedly connected, and the stripping back plate is provided with an anti-drop plate that prevents the limit block from falling off the stripping back plate. The upper end of the limit block protrudes in the left-right direction, and the lower end protrudes in the front-back direction, so that it can be hung on the stripping plate.

[0013] The fixed die assembly includes, from top to bottom, a fixedly connected lower top plate, a first pad, a template, a second pad, a lower die base, a lower die foot, and a lower supporting plate. The lower die base is provided with a stopper to prevent the lower guide rod from falling off the lower die base.

[0014] The beneficial effect of the present invention is that the stripping plate is kept fixed only at the time of stripping through the mechanical structure, which maintains the advantages of the fixed stripping plate and adapts to various stamping scenarios, has low requirements on the nitrogen spring, and simplifies the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a schematic diagram of the overall structure of the stripper plate opening and closing device of the drawing die;

[0016] Attached Figure 2 A schematic diagram of a group of opening and closing device states;

[0017] Attached Figure 3 Indicates the working process Figure 1 ;

[0018] Attached Figure 4 Indicates the working process Figure 2 ;

[0019] Attached Figure 5 Indicates the working process Figure 3 ;

[0020] Attached Figure 6 Indicates the working process Figure 4 ;

[0021] Attached Figure 7 Indicates the working process Figure 5 ;

[0022] Attached Figure 8 Indicates the working process Figure 6 ;

[0023] Attached Fig. 9 Indicates the working process Figure 7 ;

[0024] Attached Fig.10 Indicates the working process Figure 8 ;

[0025] Attached Fig.11 Indicates the working process Figure 9 ;

[0026] Attached Fig.12 is a schematic diagram of a locking member;

[0027] Attached Fig.13 A schematic diagram of a limiter.

[0028] In the above drawings: 1, movable mold part; 1-1, upper support plate; 1-2, upper mold foot; 1-3, upper mold seat; 1-4, upper pad; 1-5, fixed plate; 1-6, stripping back plate; 1-7, stripping plate; 1-8, drawing punch; 1-9, insert; 1-10, limiter; 1-11, anti-stripping plate; 1-12, insert; 1-13, first bolt; 1-14, first gasket; 1-15, second bolt; 1-16, second gasket; 1-17, upper guide rod; 1-18, third bolt; 1-19, third gasket; 2, fixed mold part; 2-1, lower top plate; 2-2, first A pad; 2-3, template; 2-4, second pad; 2-5, lower die seat; 2-6, lower die foot; 2-7, lower support plate; 2-8, drawing ring; 2-9, stripping block; 2-10, nitrogen spring; 2-11, fourth bolt; 2-12, fourth gasket; 2-13, stopper; 2-14, lower guide rod; 2-15, locking tongue; 2-16, arc-shaped shaft; 2-17, ball head cylinder; 2-18, elastic part; 2-19, elastic stop column; 3, drawn product; 4-1, upper fitting surface; 4-2, lower fitting surface; 4-3, first inclined surface; 4-4, second inclined surface. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the embodiments shown in the accompanying drawings:

[0030] like Figure 1-3 As shown, the opening and closing device of the stripper plate 1-7 of the drawing die includes a movable die part 1 and a fixed die part 2, wherein the movable die part 1 includes a first movable die assembly, a plurality of upper guide rods 1-17 fixed on the first movable die assembly, and a second movable die assembly slidable up and down and arranged on the upper guide rods 1-17, wherein the fixed die part 2 includes a fixed die assembly, a stripper assembly installed in the fixed die assembly, and the fixed die part 2 also includes a lock installed on the fixed die assembly which can be unlocked when the movable die part 1 moves downward and is in a locked position when the movable die part 1 moves upward. The movable mold part 1 includes a plunger 1-12 hung on the first movable mold component and inserted into the second movable mold component, a limiter 1-10 installed on the second movable mold component and first maintained in a locked position during the upward movement of the second movable mold component and then unlocked by the plunger 1-12, thereby unlocking the locking member, the limiter 1-10 is connected to the second movable mold component along a direction toward and away from the plunger 1-12 and is prohibited from coming out of the second movable mold component along the up and down directions.

[0031] The first movable mold assembly includes a first upper movable module, and a first lower movable module fixed below the first upper movable module and spaced apart from the first upper movable module. When the inserting knife 1-12 is lifted by the fixed mold part 2, it passes through the first lower movable module and abuts against the lower end surface of the first upper movable module after passing through the gap.

[0032] The limiting member 1-10 forms an upper fitting surface, a lower fitting surface and a first inclined surface 4-3 connected between the upper fitting surface 4-1 and the lower fitting surface 4-2 on the side wall of the inserting knife 1-12. A second inclined surface 4-4 is formed between the side surface and the lower end surface of the inserting knife 1-12 facing the limiting member 1-10 and cooperates with the first inclined surface to form a wedge-shaped surface. When the movable mold part 1 moves upward and the lower fitting surface fits with the side surface of the inserting knife 1-12, the limiting member 1-10 is in a locked position and the locking member interferes with the limiting member 1-10. When the movable mold part 1 moves upward and the upper fitting surface fits with the side surface of the inserting knife 1-12, the limiting member 1-10 is in an unlocked position and the locking member is unlocked.

[0033] The locking member includes a lower guide rod 2-14 which can slide up and down and is arranged in the fixed mold part 2 and is prohibited from being pulled out from the top of the fixed mold part 2, a locking tongue 2-15 which is rotatably connected to the upper end of the lower guide rod 2-14 and can partially extend out of the lower guide rod 2-14 after rotation and can interfere with the limit member 1-10 and then lock with the limit member 1-10, an elastic member connected to the locking tongue 2-15 and the lower guide rod 2-14 bracket so that the locking tongue 2-15 always has a tendency to extend out of the lower guide rod 2-14, and a ball head fixed on one end of the elastic member 2-18 A cylinder 2-17, an elastic stop column 2-19 fixed in the locking tongue 2-15 and pressed against the other end of the elastic member 2-18, and an arc-shaped shaft 2-16 rotatably connected in the lower guide rod 2-14 and used for rotatably connecting the locking tongue 2-15 with the lower guide rod 2-14, the rear end of the locking tongue 2-15 is fixed in the arc-shaped shaft, the elastic stop column and the front end of the locking tongue 2-15 are located on both sides of the arc-shaped shaft and form a limit for the arc-shaped shaft, and the lower end of the lower guide rod 2-14 is connected with a fourth gasket 2-11 and a fourth bolt 2-12 to prevent the lower guide rod 2-14 from being pulled out from above the fixed mold part 2.

[0034] The lower end of the upper guide rod 1-17 is connected with a second bolt 1-15 and a second gasket 1-16 for preventing the second movable mold assembly from sliding off the upper guide rod 1-17. The upper end of the upper guide rod 1-17 is connected with a third bolt 1-18 and a third gasket 1-19 for preventing the upper guide rod 1-17 from sliding off the first movable mold assembly.

[0035] The upper end of the insert 1-12 is hung on the first lower movable module through the first gasket 1-14 and the first bolt 1-13. The first upper movable module includes, from top to bottom, an upper support plate 1-1 and an upper die foot 1-2 that are fixedly connected; the first lower movable module includes, from top to bottom, an upper die seat 1-3, an upper pad 1-4, and a fixed plate 1-5 that are fixedly connected to the upper die foot 1-2, a gap is formed between the upper die seat 1-3 and the upper support plate 1-1, and the second movable mold assembly includes, from top to bottom, a stripping back plate 1-6 and a stripping plate 1-7 that are fixedly connected, and the stripping back plate 1-6 is provided with an anti-slip plate 1-11 that prevents the limit block from falling off the stripping back plate 1-6. The upper end of the limit block protrudes in the left-right direction, and the lower end protrudes in the front-back direction, so that it can be hung on the stripping plate 1-7. The stripping assembly includes a drawing ring 2-8, a stripping block 2-9, and a nitrogen spring 2-10.

[0036] The fixed mold assembly includes, from top to bottom, a fixedly connected lower top plate 2-1, a first pad 2-2, a template 2-3, a second pad 2-4, a lower mold base 2-5, a lower mold foot 2-6, and a lower support plate 2-7. The lower mold base 2-5 is provided with a stopper 2-13 to prevent the lower guide rod 2-14 from falling off the lower mold base 2-5.

[0037] During the production process, the drawing die needs to be installed on the punch press, the fixed die part 2 is installed on the lower table of the punch press and remains stationary, and the movable die part 1 is installed on the table of the punch press and can reciprocate up and down with the slider on the punch press. Figure 1 , 2 , 3 are schematic diagrams of the top dead center state. At this time, the stripping back plate 1-6 and the stripping plate 1-7 are in an open state under the action of gravity. The stripping back plate 1-6 and the stripping plate 1-7 are hung on the upper pad 1-4 by the upper guide rod and the hanging assembly composed of bolts and gaskets. Then the punch press drives the upper die downward. When the insert 1-9 installed in the stripping plate 1-7 begins to contact the deep-drawn product 3, the product 3 supports the stripping back plate 1-6 and the stripping plate 1-7 through the insert 1-9, as shown in FIG. Figure 4 As shown, as the upper die continues to move downward, its position remains unchanged, and the positions of the insert 1-12 and the first bolt 1-13 and the first gasket 1-14 installed on its upper end also remain unchanged. At this time, the drawing punch 1-8 gradually emerges from the stripping plate 1-7 and enters the drawn product 3. When the stripping back plate 1-6 and the fixed plate 1-5 are closed, the drawing punch 1-8 completely enters the drawn product 3. At this time, the first gasket 1-14 contacts the upper support plate 1-1, and at the same time, the inclined surface at the lower end of the insert 1-12 interacts with the inclined surface on the limit member 1-10 to pull the limit member 1-10 to the far left, as shown in FIG. Figure 5 As shown, the punch slide then continues to move downward, the drawing punch 1-8 presses the drawn product 3 into the drawing ring 2-8, and the stripping block 2-9 moves downward and compresses the nitrogen spring 2-10, as shown in FIG. Figure 6As shown, when the stopper 1-10 begins to contact the spring tongue 2-15, as the punch slider continues to move downward, the stopper 1-10 pulls the spring tongue 2-15 to rotate. When the punch runs to the bottom dead center, the mold is completely closed, and the product 3 completes deep drawing. At this time, the spring tongue 2-15 returns to its initial position under the action of the elastic member 2-18, as shown in FIG. Figure 7 As shown, the lower guide rod 2-14 is "locked" together with the limiter 1-10 and the inserting knife 1-12 through the spring tongue 2-15. Then the punch press drives the upper die upward, such as Figure 8 As shown, the stripping block 2-9, driven by the nitrogen spring 2-10, separates the drawn product 3 from the drawing ring 2-8, and the lower guide rod 2-14 moves upward under the action of the limiter 1-10 and the insert 1-12. When the fourth gasket 2-12 contacts the first pad 2-2, the stripping back plate 1-6 and the stripping plate 1-7 remain in position. As the punch press continues to operate, the drawing punch 1-8 begins to be stripped from the drawn product 3. When the first pad 1-14 contacts the upper pad 1-4, the drawing punch 1-8 is completely stripped from the drawn product 3, completing the stripping process, as shown in FIG. Fig. 9 As shown, the inserting knife 1-12 then starts to move upward. At this time, the third gasket 1-19 is still some distance away from the upper pad 1-4. When the straight edge area of ​​the inserting knife 1-12 leaves the straight edge area on the right side of the limiting member 1-10, as shown in FIG. Fig.10 As shown, at this time, the third gasket 1-19 is in contact with the upper pad 1-4, and at the same time, the limit member 1-10 moves to the far right under the pulling of the spring tongue 2-15. At this time, the "locking" structure composed of the lower guide rod 2-14 through the spring tongue 2-15 and the limit member 1-10 and the insert 1-12 is disintegrated, and the lower guide rod 2-14 and the structural parts installed thereon fall back to the initial position under the action of gravity. At the same time, the punch press drives the upper die back to the top dead center, and the one-stroke stamping process is completed.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A stripper plate opening and closing device for a drawing die, comprising a movable die portion and a fixed die portion, wherein the movable die portion comprises a first movable die assembly, a plurality of upper guide rods fixed to the first movable die assembly, and a second movable die assembly slidable up and down on the upper guide rods, wherein the fixed die portion comprises a fixed die assembly and a stripper assembly installed in the fixed die assembly, characterized in that: The fixed mold part also includes a locking member installed on the fixed mold assembly, which can be unlocked when the movable mold part moves downward and is in a locked position when the movable mold part moves upward. The movable mold part includes a plunger hung on the first movable mold assembly and inserted into the second movable mold assembly, and a limiting member installed on the second movable mold assembly and first maintained in a locked position during the upward movement of the second movable mold assembly and then unlocked by the plunger to unlock the locking member. The limiting member is connected to the second movable mold assembly in a sliding direction toward and away from the plunger and is prohibited from being disengaged from the second movable mold assembly in the up and down directions; the first movable mold assembly includes a first upper movable module, a first lower movable module fixed below the first upper movable module and spaced from the first upper movable module, and when the plunger is lifted by the fixed mold part, it passes through the first lower movable module and abuts against the lower end surface of the first upper movable module after passing through the gap; the limiting member forms an upper portion toward the side wall of the plunger. The locking member is a first locking member, a second locking member being configured to lock the locking member when the locking member is in a locked position and the locking member is interfered with by the locking member when the movable mold portion moves upward and the lower locking surface is engaged with the side surface of the inserting knife. The locking member is a second locking member being configured to lock the locking member when the movable mold portion moves upward and the upper locking surface is engaged with the side surface of the inserting knife. The locking member is a second locking member being configured to lock the locking member when the movable mold portion moves upward and the upper locking surface is engaged with the side surface of the inserting knife.

2. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The locking member includes a ball-head cylinder fixed on one end of the elastic member, an elastic blocking column fixed in the locking tongue and pressed against the other end of the elastic member, and an arc-shaped rotating shaft rotatably connected in the lower guide rod and used to rotatably connect the locking tongue to the lower guide rod, and the rear end of the locking tongue is fixed in the arc-shaped rotating shaft.

3. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The upper end of the insert is hung on the first lower moving module through a first gasket and a first bolt.

4. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The lower end of the upper guide rod is connected with a second bolt and a second gasket to prevent the second movable mold assembly from sliding off the upper guide rod.

5. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The upper end of the upper guide rod is connected with a third bolt and a third gasket for preventing the upper guide rod from sliding off the first movable mold assembly.

6. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The first upper movable module includes, from top to bottom, an upper support plate and an upper mold foot that are fixedly connected; the first lower movable module includes, from top to bottom, an upper mold base, an upper pad, and a fixed plate that are fixedly connected to the upper mold foot, and a gap is formed between the upper mold base and the upper support plate. The second movable mold assembly includes, from top to bottom, a stripping back plate and a stripping plate that are fixedly connected.

7. The stripper plate opening and closing device for a drawing die according to claim 1, characterized in that: The fixed die assembly includes, from top to bottom, a fixedly connected lower top plate, a first pad, a template, a second pad, a lower die base, a lower die foot, and a lower supporting plate. The lower die base is provided with a stopper to prevent the lower guide rod from falling off the lower die base.

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