Stamping die with variable limiting size

Abstract

The utility model relates to the technical field of stamping dies, and discloses a stamping die with a variable limit size, which comprises an upper die plate, an upper die plate collision block, a lower die plate and an adjustable collision block, the upper die plate slides back and forth in the vertical direction, the lower die plate is fixed, the adjustable collision block comprises a lower die plate collision block and a movable collision block, and the movable collision block is arranged on the lower die plate collision block. The upper die plate collision block is fixedly installed on the lower surface of the upper die plate and comprises a plurality of sets of collision blocks with different heights, the lower die plate collision block is fixedly installed on the upper surface of the lower die plate, the movable collision block is installed on the upper surface of the lower die plate collision block in a sliding mode, and the lower die plate is provided with an air cylinder which can control the movable collision block to slide on the upper surface of the lower die plate collision block. And when the position of the movable collision block corresponds to the collision blocks with different heights of the upper template collision block, the limiting distances between the upper template and the lower template are different when the upper template and the lower template are closed. The limiting size between the upper die plate and the lower die plate can be rapidly adjusted under the condition of continuous normal production of a punching machine, and the precise limiting function is achieved when the limiting distances between the upper die plate and the lower die plate of the punching die are different.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a stamping die with variable limit sizes. Background Art

[0002] At present, when using a toggle punch press for stamping, in order to meet the dimensional accuracy requirements of the stamped parts, in general, the stamping die will use a mechanical limit mechanism (i.e., upper and lower bumpers) to mechanically limit the sliding upper template at the bottom dead center position. The upper template bumper is installed on the lower surface of the sliding upper template, and the lower template bumper is installed on the upper surface of the fixed lower template. The contact surfaces of the upper and lower bumpers when they are in limited contact are both flat, and their cross-sectional shapes are basically the same. When the upper and lower templates are in the mold opening state, the lower surface of the upper template bumper and the upper surface of the lower template bumper are in a separated state; when the upper and lower templates are in the mold closing state, the lower surface of the upper template bumper and the upper surface of the lower template bumper are in a contact limited state. The contact between the upper and lower bumpers realizes the mechanical limit of the sliding upper template at the bottom dead center position, ensures the position accuracy of the upper template at the bottom dead center, and meets the dimensional accuracy requirements of the stamped parts.

[0003] In order to maximize the material utilization rate of stamping sheets, stamping dies often use double-row or even multi-row die layouts. When using such a multi-station die for sheet metal stamping, it is sometimes necessary to make appropriate adjustments to the position of the bottom dead point of the upper template in one or several punches, that is, in these special punches, the position of the bottom dead point of the upper template is appropriately adjusted upward or downward by a certain amount to meet the dimensional accuracy requirements of all stamping workpieces. In this case, the limit distance of this one (or several) punches is different from the limit distance of most other punches. At this time, the ordinary mechanical limit mechanism can no longer meet the requirements of this working condition. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a stamping die with a variable limit size, which is provided with an adjustable limit mechanism. By using this limit mechanism, when the sliding upper die plate is in the bottom dead point state of different punches, the limit distance between the upper and lower die plates can be different in size, and the limit mechanism can be quickly switched between different limit states (i.e. different limit distances) without affecting the normal continuous working state of the punch press.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A stamping die with variable limit size comprises an upper template, an upper template bumper, a lower template and an adjustable bumper. The upper template performs reciprocating sliding in the vertical direction, and the lower template is fixed. The lower template adjustable bumper comprises a lower template bumper and a movable bumper. The upper template bumper is fixedly mounted on the lower surface of the upper template and comprises a plurality of groups of bumpers with different heights. The lower template bumper is fixedly mounted on the upper surface of the lower template, and the movable bumper is slidably mounted on the upper surface of the lower template bumper. A cylinder is fixedly mounted on the upper surface of the lower template and can control the movable bumper to slide on the upper surface of the lower template bumper. When the position of the movable bumper corresponds to bumpers of different heights of the upper template bumper, the limit distance between them is different when the upper and lower templates are closed.

[0007] Preferably, the upper template collision block includes two groups of collision blocks with different heights, that is, two different limiting sizes are usually provided.

[0008] Specifically, an upper template collision block is fixedly installed near the four corners of the upper template; the upper template collision block can reciprocate up and down with the upper template; the contact surface of each upper template collision block is divided into two left and right areas, and a groove is arranged in the middle of the two areas, and the groove is used to install bolts, and the thickness of the upper template collision blocks on both sides of the groove are different, and the heights are A and B respectively, B>A, that is, the B-size areas with larger thickness of the four collision blocks are all installed close to the inner side of the upper template, and the size areas with smaller thickness are all installed close to the outer side of the upper template.

[0009] A set of adjustable bump blocks are respectively arranged at the left and right ends of the upper surface of the lower template to ensure that both the left and right ends of the lower template can achieve precise mechanical limiting. The middle area of ​​the lower template is installed with stamping dies of several stations.

[0010] The lower template collision blocks are provided with four, and their height is D. They are fixedly installed on the upper surface of the lower template near the four corners by screws. A bracket is fixedly installed on each side surface of each lower template collision block by screws. The bracket extends a section toward the middle direction of the two lower template collision blocks, and the extended part is provided with a circular hole. Pins are fixedly installed in the circular holes of the brackets on both sides of the lower template collision blocks; a cylinder bracket is fixedly installed on both sides of the upper surface of the lower template near the middle position of the edge, and a cylinder is fixedly installed on the vertical surface of each cylinder bracket by screws, and the piston rod of the cylinder faces the inner direction of the lower template; the piston rod of the cylinder is also provided with a connecting block and a slider, and the connecting block fixes the piston rod of the cylinder to the slider together, and two parallel through holes are provided inside the slider, so that the slider can slide horizontally along the two pins, and the pin provides a guiding effect for the slider when sliding.

[0011] The movable impact block is fixed on the upper surface of the slider by screws, and its height is C. The lower surface of the movable impact block is respectively attached to the upper surface of the lower template impact block, and the movable impact block can slide left and right along the upper surface of the lower template impact block; when the piston rod of the cylinder is extended or retracted, it drives the slider to slide left and right together, and the two movable impact blocks fixed to the slider slide left and right on the upper surface of the lower template impact block.

[0012] When the cylinder piston rods at the left and right ends of the lower template are in a retracted state, the four movable collision blocks are located on the outer side of the upper surface of the lower template, corresponding to the position of the collision blocks of the upper template close to the outer side of the upper template; when the upper and lower templates are closed, the limit distance between the lower surface of the upper template and the upper surface of the lower template is: A+C+D;

[0013] When the cylinder piston rods at the left and right ends of the lower template are in an extended state, the four movable impact blocks are located on the inner side of the upper surface of the lower template, corresponding to the position of the upper template impact block close to the inner side of the upper template; when the upper and lower templates are closed, the limiting distance between the lower surface of the upper template and the upper surface of the lower template is: B+C+D.

[0014] By using precision machining methods and strictly controlling the thickness dimensions A and B of the left and right areas of the upper template collision block, the change of the limit size between the upper template and the lower template can be achieved under the mold closing state of different punches.

[0015] The high-frequency solenoid valve and quick exhaust valve are used to control the cylinder's inlet and exhaust pipeline system. When the upper template approaches the highest point, the punch press spindle encoder sends an action signal, and the cylinder piston rod quickly extends or retracts. In this way, the function of quickly adjusting the limit size between the upper and lower templates is realized under the condition of continuous normal production of the punch press.

[0016] The above technical solution takes the stamping die structure in which the upper template performs reciprocating sliding in the vertical direction and the lower template is fixed as an example to introduce the structure of the utility model. Similarly, the utility model can also be applied to the stamping die structure in which the upper template is fixed and the lower template performs reciprocating sliding in the vertical direction, or other similar working conditions.

[0017] If necessary, it can also be set to B<A, that is, the smaller thickness areas of the four upper template collision blocks are installed close to the inner side of the upper template, and the larger thickness areas are installed close to the outer side of the upper template.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The utility model can realize the precise limiting function when the limiting distance between the upper and lower templates of the stamping die is of different sizes;

[0020] 2. The utility model can quickly adjust the limit size between the upper and lower templates when the punch press is in continuous normal production;

[0021] 3. The utility model is applicable to a stamping die structure in which the upper die plate performs reciprocating sliding in the vertical direction and the lower die plate is fixed, and can also be applied to a stamping die structure in which the upper die plate is fixed and the lower die plate performs reciprocating sliding in the vertical direction, or other similar working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of a mechanical limit mechanism in the prior art;

[0023] Figure 2 This is a schematic diagram of the upper template structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the lower template structure when the cylinder of the utility model is in a retracted state;

[0025] Figure 4 This is a schematic diagram of the lower template structure when the cylinder of the utility model is in an extended state;

[0026] Figure 5 It is a schematic diagram of the mold opening and closing state when the cylinder of the utility model is in the retracted state;

[0027] Figure 6 It is a schematic diagram of the mold opening and closing state when the cylinder of the utility model is in the extended state.

[0028] Among them: 1-upper template collision block, 2-upper template, 3-lower template, 4-movable collision block, 5-bracket, 6-pin shaft, 7-cylinder bracket, 8-cylinder, 9-connecting block, 10-slider, 11-lower template collision block. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the prior art, common mechanical limit mechanisms such as Figure 1As shown, (a) in the figure is the mold opening state, and (b) in the figure is the mold closing state. An upper template collision block is installed on the lower surface of the sliding upper template, and a lower template collision block is installed on the upper surface of the fixed lower template. The contact surfaces of the upper and lower collision blocks when they are in limit contact are both planes, and their cross-sectional shapes are basically the same. When the upper and lower templates are in the mold opening state, the lower surface of the upper template collision block and the upper surface of the lower template collision block are in a separated state; when the upper and lower templates are in the mold closing state, the lower surface of the upper template collision block and the upper surface of the lower template collision block are in a contact limit state. However, this structure cannot adapt to the working conditions where the limit distance of one or several strokes is different from the limit distance of most other strokes.

[0031] Embodiment 1: A stamping die limit mechanism with variable limit size, comprising Figure 2 The upper template shown and Figure 3 (or Figure 4 ) is combined with the lower template shown in FIG. It is suitable for a stamping die structure in which the upper template reciprocates in the vertical direction and the lower template is fixed.

[0032] The upper template structure is as follows Figure 2 As shown, (a) in the figure is a bottom view of the upper template, (b) in the figure is a cross-sectional view along the direction of the arrow in the upper figure, and the arrow in the figure is the movement direction of the upper template. The upper template collision block 1 is installed and fixed on the lower surface of the upper template 2, and an upper template collision block 1 is set at each of the four corners near the upper template 2. The upper template collision block 1 can reciprocate up and down with the upper template 2. The contact surface of each upper template collision block 1 is divided into two left and right areas, and a groove is set in the middle of the two areas; the thickness of the upper template collision block 1 on both sides of the groove is different, and the height is A and B respectively.

[0033] like Figure 2 As shown, the dimension B>A, the B dimension areas with larger thickness of the four collision blocks are all installed close to the inner side of the upper template 2, and the A dimension areas with smaller thickness are all installed close to the outer side of the upper template 2.

[0034] The utility model has a lower template structure when the cylinder is retracted. Figure 3 As shown, (a) in the figure is a bottom view of the lower template, and (b) in the figure is a top view of the lower template. The lower template 3 is fixed, and the left and right ends of the upper surface of the lower template 3 are respectively provided as follows Figure 3 The set of adjustable bump blocks shown in the figure ensures that both the left and right ends of the lower template can achieve precise mechanical limit. The middle area of ​​the lower template 3 is equipped with a stamping die of several stations ( Figure 3 not shown in the figure).

[0035] Four lower template collision blocks 11 are provided on the upper surface of the lower template 3, and their height is D. They are fixedly installed on the upper surface of the lower template 3 near the four corners by screws. A bracket 5 is fixedly installed on each side surface of each lower template collision block 11 by screws. The bracket 5 extends a section toward the middle of the two lower template collision blocks, and a circular hole is provided on the extended part, and a pin 6 is fixedly installed in the circular hole; a cylinder bracket 7 is fixedly installed on both sides of the upper surface of the lower template 3 near the middle position of the edge, and a cylinder 8 is fixedly installed on the vertical surface of each cylinder bracket 7 by screws, and the piston rod of the cylinder 8 faces the inner direction of the lower template 3; the piston rod of the cylinder 8 is also provided with a connecting block 9 and a slider 10. The connecting block 9 fixes the piston rod of the cylinder 8 to the slider 10, and two parallel through holes are provided inside the slider 10, so that the slider 10 can slide horizontally along the two pins 6, and the pin 6 provides a guiding effect for the slider 10 when sliding.

[0036] The movable bumper 4 is fixed to the upper surface of the slider 10 by screws, and its height is C. The lower surface of the movable bumper 4 is respectively attached to the upper surface of the lower template bumper 11, and the movable bumper 4 can slide left and right along the upper surface of the lower template bumper 11. When the piston rod of the cylinder 8 is extended or retracted, the slider 10 is driven to slide left and right together, and the two movable bumpers 4 fixed to the slider 10 slide left and right on the upper surface of the lower template bumper 11.

[0037] like Figure 3 As shown, when the piston rods of the cylinders 8 at the left and right ends of the lower template 3 are in the retracted state, the two movable impact blocks 4 on the left side of the lower template 3 are located at the left area of ​​the upper surface of the two lower template impact blocks 11 at the left end; the two movable impact blocks 4 on the right side of the lower template 3 are located at the right area of ​​the two lower template impact blocks 11 at the right end.

[0038] When the piston rods of the cylinder 8 at both ends of the lower template 3 are in the extended state, the adjustable limit mechanism of the lower template is as follows Figure 4 As shown, (a) is a bottom view of the lower template, and (b) is a top view of the lower template. When the piston rods of the cylinders 8 at the left and right ends of the lower template 3 are both in the extended state, the two movable bumpers 4 on the left side of the lower template 3 are located at the right area of ​​the upper surface of the two lower template bumpers 11 at the left end; the two movable bumpers 4 on the right side of the lower template 3 are located at the left area of ​​the upper surface of the two lower template bumpers 11 at the right end.

[0039] At the bottom dead center of some strokes, a smaller limit distance is required between the upper template 2 and the lower template 3. The piston rods of the two cylinders 8 on the left and right sides of the lower template 3 are both in a retracted state. When the upper template descends to the dead center, the limit distance between the lower surface of the upper template 2 and the upper surface of the lower template 3 is: A+C+D. The opening and closing states of the upper and lower templates are as follows: Figure 5 shown.

[0040] At the bottom dead center state of some strokes, when a larger limit distance is required between the upper template 2 and the lower template 3, the piston rods of the two cylinders 8 on the left and right sides of the lower template 3 are both in the extended state. At this time, the limit distance between the lower surface of the upper template 2 and the upper surface of the lower template 3 is: B+C+D. The opening and closing states of the upper and lower templates are as follows: Figure 6 shown.

[0041] like Figure 5 , Figure 6 As shown, Figure 5 (a) is the mold opening state when the cylinder piston rod is retracted. Figure 5 (b) is the mold opening state when the cylinder piston rod is retracted. Figure 6 (a) is the mold opening state when the cylinder piston rod is extended. Figure 6 (b) in the figure is the mold opening state when the cylinder piston rod is extended. By extending and retracting the piston rod of the cylinder 8, the movable bumper 4 is driven to slide between the two areas on the upper surface of the lower template bumper 11 through the connecting block 9 and the slider 10. When the upper template 2 and the lower template 3 are in the mold closing state, the upper surface of the movable bumper 4 contacts the left and right areas on the lower surface of the upper template bumper 1, respectively, to achieve the following limit function:

[0042] When the piston rod is retracted and the mold is closed, the limit distance between the upper and lower mold plates is: A+C+D;

[0043] When the piston rod is extended and the mold is closed, the limit distance between the upper and lower mold plates is: B+C+D.

[0044] By using precision machining methods and strictly controlling the thickness dimensions A and B of the left and right areas of the upper template collision block 1, the change of the limit dimension between the upper template 2 and the lower template 3 can be achieved under the mold closing state of different punching times.

[0045] The inlet and outlet pipe systems of the cylinder 8 are controlled by high-frequency solenoid valves and quick exhaust valves. When the upper template 2 approaches the highest point, the punch press spindle encoder sends an action signal, and the piston rod of the cylinder 8 quickly extends or retracts. In this way, the function of quickly adjusting the limit size between the upper and lower templates is realized under the condition of continuous normal production of the punch press.

[0046] Embodiment 2: The difference from Embodiment 1 is that: Figure 2 The dimension B shown in the figure is less than A, that is, the smaller thickness areas of the four upper template collision blocks 1 are all installed close to the inner side of the upper template 2, and the larger thickness areas are all installed close to the outer side of the upper template 2. The lower template has the same structure. In this case, when the piston rod is retracted and the mold is closed, the limit distance A+C+D between the upper and lower templates is larger; when the piston rod is extended and the mold is closed, the limit distance B+C+D between the upper and lower templates is smaller. The technical effect of embodiment 2 is the same as that of embodiment 1, and it can be selected according to installation needs in actual application.

[0047] Embodiment 3: The difference from Embodiment 1 is that the structures of the upper template and the lower template are interchanged. That is, Figure 2 The upper template structure diagram is used as the lower template structure diagram. Figure 3 , 4 The lower template structure diagram is used as the upper template structure diagram. Figure 5 , 6 The schematic diagram of the mold opening and closing state is turned upside down. The technical effect of the third embodiment is the same as that of the first embodiment, and is applicable to a stamping mold structure in which the upper mold plate is fixed and the lower mold plate reciprocates in the vertical direction.

[0048] When a toggle punch is used for punching, the limit mechanism is used to achieve different minimum spacings (i.e., limit distances) between the upper and lower templates of the punching die in different die closing states of different punches; and these different limit states can be quickly switched during continuous production of the punch.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stamping die with variable limit size, characterized in that: It includes an upper template, an upper template collision block, a lower template and an adjustable collision block. The upper template performs reciprocating sliding in the vertical direction, and the lower template is fixed. The adjustable collision block includes a lower template collision block and a movable collision block. The upper template collision block is fixedly installed on the lower surface of the upper template, including a plurality of groups of collision blocks with different heights. The lower template collision block is fixedly installed on the upper surface of the lower template, and the movable collision block is slidably installed on the upper surface of the lower template collision block. A cylinder is fixedly installed on the upper surface of the lower template, which can control the movable collision block to slide on the upper surface of the lower template collision block. When the position of the movable collision block corresponds to collision blocks of different heights of the upper template collision block, the limit distance between them is different when the upper and lower templates are closed.

2. The stamping die with variable limit size according to claim 1, characterized in that: The upper template collision blocks include two groups of collision blocks with different heights.

3. The stamping die with variable limit size according to claim 2, characterized in that: Near the four corners of the upper template, each upper template collision block is fixedly installed; the upper template collision block can reciprocate up and down together with the upper template; the contact surface of each upper template collision block is divided into two left and right areas, and a groove is arranged in the middle of the two areas, and the groove is used to install bolts, and the thickness of the upper template collision blocks on both sides of the groove are different, and the heights are A and B respectively, B>A, that is, the B-size areas with larger thickness of the four collision blocks are all installed close to the inner side of the upper template, and the size areas with smaller thickness are all installed close to the outer side of the upper template.

4. The stamping die with variable limit size according to claim 3, characterized in that: The lower template collision blocks are provided with four, and their height is D. They are fixedly installed on the upper surface of the lower template near the four corners by screws. A bracket is fixedly installed on each side surface of each lower template collision block by screws. The bracket extends a section toward the middle direction of the two lower template collision blocks, and a circular hole is provided on the extended part. Pins are fixedly installed in the circular holes of the brackets on both sides of the lower template collision blocks; a cylinder bracket is fixedly installed on both sides of the upper surface of the lower template near the middle position of the edge, and a cylinder is fixedly installed on the vertical surface of each cylinder bracket by screws, and the piston rod of the cylinder faces the inner direction of the lower template; the piston rod of the cylinder is also provided with a connecting block and a slider, and the connecting block fixes the piston rod of the cylinder to the slider together, and two parallel through holes are provided inside the slider, so that the slider can slide horizontally along the two pins, and the pin provides a guiding effect for the slider when sliding; The movable impact block is fixed on the upper surface of the slider by screws, and its height is C. The lower surface of the movable impact block is respectively attached to the upper surface of the lower template impact block, and the movable impact block can slide left and right along the upper surface of the lower template impact block; when the piston rod of the cylinder is extended or retracted, it drives the slider to slide left and right together, and the two movable impact blocks fixed to the slider slide left and right on the upper surface of the lower template impact block.

5. The stamping die with variable limit size according to claim 4, characterized in that: When the cylinder piston rods at the left and right ends of the lower template are in a retracted state, the four movable collision blocks are located on the outer side of the upper surface of the lower template, corresponding to the position of the collision blocks of the upper template close to the outer side of the upper template; when the upper and lower templates are closed, the limit distance between the lower surface of the upper template and the upper surface of the lower template is: A+C+D; When the cylinder piston rods at the left and right ends of the lower template are in an extended state, the four movable impact blocks are located on the inner side of the upper surface of the lower template, corresponding to the position of the upper template impact block close to the inner side of the upper template; when the upper and lower templates are closed, the limiting distance between the lower surface of the upper template and the upper surface of the lower template is: B+C+D.

6. The stamping die with variable limit size according to claim 1, characterized in that: A high-frequency solenoid valve and a quick exhaust valve are also provided, and the high-frequency solenoid valve and the quick exhaust valve are used to control the extension or retraction of the cylinder piston rod.

7. The stamping die with variable limit size according to claim 1, characterized in that: The lower template is fixed and provided with a fixed lower template collision block, and the upper template reciprocates in the vertical direction and is provided with an adjustable collision block, including a fixed upper template collision block and a movable collision block.

8. The stamping die with variable limit size according to claim 3, characterized in that: B<A, the smaller thickness areas of the four upper template collision blocks are all installed close to the inner side of the upper template, and the larger thickness areas are all installed close to the outer side of the upper template.

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