CN207787464U - A kind of shaping punching die structure - Google Patents

Abstract

The utility model discloses a plastic punching die structure, which comprises an upper mold pressing plate, an upper template and a lower mold, the lower mold is provided with a concave plastic cavity, the bottom of the plastic cavity is provided with punching holes, and the upper template The lower part is provided with a clamping plate that can move up and down, and a first elastic element and a guide limit mechanism are provided between the upper template and the clamping plate. The first elastic element drives the clamping plate to move down and separate from the upper template. The guiding and limiting mechanism forms a secondary punching gap between the upper template and the binder plate, the upper template is provided with a shaping head that can move up and down, the pressing plate is provided with a shaping hole, and the shaping head The lower end of the shaping head is fitted in the shaping hole, a second elastic element is provided between the shaping head and the upper mold pressing plate, a moving hole is arranged on the shaping head, and a Punches on molded plates. The utility model can complete shaping and punching at the same time, thereby facilitating the simplification of the process, saving the mold manufacturing cost and improving the production efficiency.

Description

A plastic punching die structure

technical field

The utility model relates to the technical field of stamping dies, in particular to a structure of a plastic punching die.

Background technique

Stamping dies are widely used in the automobile manufacturing industry. For automobile sheet metal parts, it is often necessary to form a groove with a through hole on the workpiece so that a nut or bolt head can be set in the groove, and the bolt can pass through the through hole. In the prior art, people usually need to complete the stamping and forming of the groove with a through hole through two processes. Specifically, first use a stretch forming die to stretch and form a groove on the sheet, and then use a punching die to form a groove in the groove. A through hole is punched out on the bottom surface of the groove. On the one hand, it can ensure that the shape of the through hole does not change, and at the same time, it can ensure the accuracy of the relative position between the through hole and the groove. For example, a "punching die" disclosed in Chinese patent documents, whose notification number is CN204074900U, specifically includes an upper die and a lower die, and when the upper die and the lower die are combined, a punching cavity is formed. Head, drive assembly, stroke assembly and buffer assembly, the stamping head, drive assembly and stroke assembly are integrated on the buffer assembly, the stroke assembly includes a left stroke groove, a left stroke rod and a right stroke groove, a right stroke rod, The left stroke groove, left stroke rod, right stroke rod, and right stroke groove are arranged in sequence from left to right. The lower mold includes a base, a guide post, a guide groove and a lower film groove. The guide post, guide groove and lower film groove are integrated in the On the base, the lower membrane groove is matched with the stamping head, the guide posts are distributed on both sides of the lower membrane groove, and the guide grooves are distributed between the guide pillars and the lower membrane groove.

Another "deep drawing die for one-time drawing forming" disclosed in the Chinese patent literature, its notification number is CN205996024U, includes a drawing punch, a drawing die and a blank holder, and the drawing punch and A deep drawing cavity is formed between the drawing dies, the outermost dimension of the deep drawing cavity is larger than the external dimension of the molded part, and the outermost dimension of the deep drawing cavity is formed between the external dimension of the molded part The process surface, the curved surface shape of the process surface is the extension of the curved surface shape of the formed part, the ears of at least one symmetrical two ends of the drawing punch and the drawing die are provided with corresponding drawing ribs and rib grooves, the The blank holder is arranged next to the ear. The deep-drawing die can be used for one-time drawing and forming of deep-drawing parts, which can greatly improve efficiency and reduce costs.

However, the above-mentioned punching and stretching dies have the following defects. At first, it is necessary to manufacture two secondary punching dies, and the processing of the groove with through holes can be completed through two processes, which not only increases the cost of the die, but also causes an increase in the initial investment. It is not conducive to organizing production and reducing production efficiency.

Utility model content

The purpose of this utility model is to solve the problem that existing stamping dies cannot complete shaping and punching at one time, and provide a shaping and punching die structure, which can complete shaping and punching at the same time, thereby facilitating the simplification of the process. Save mold manufacturing costs and improve production efficiency.

In order to achieve the above object, the utility model adopts the following technical solutions: a plastic punching mold structure, including an upper mold and a lower mold with a plastic cavity, the upper mold includes an upper mold pressing plate and an upper template, and it is characterized in that, in the The bottom of the shaping cavity is provided with a punching hole, the lower part of the upper template is provided with a movable press plate, and a first elastic element and a press plate that can be defined are arranged between the upper template and the press plate. The guide limit mechanism of the downward stroke, the first elastic element moves the binder plate down and separates the upper template, and the guide limit mechanism forms a secondary punching gap between the upper template and the binder plate. A shaping hole is provided on the pressing plate, and a shaping head whose lower end fits in the shaping hole is arranged on the upper mold plate, and a second elastic element is arranged between the shaping head and the pressing plate of the upper mold. A moving hole is arranged on the head, and a punch fixed on the pressing plate of the upper mold is arranged in the moving hole.

In the utility model, the shaping cavity for shaping is arranged on the lower die, so that the punched plate is conveniently placed and positioned on the lower die. When the upper mold and the lower mold start to close the mold, the pressing plate first presses the plate, so that the plate is firmly positioned, and it is convenient for the shaping head to shape the plate. Then the first elastic element is squeezed, and the distance between the pressing plate and the upper template is gradually reduced. At this time, the shaping head protrudes downward from the shaping hole of the pressing plate, and the shaping head cooperates with the shaping cavity on the lower mold to carry out Shaping so that the sheet forms a concave groove. When the plate is finished shaping, the lower die exerts an upward force on the shaping head, so that the second elastic element between the shaping head and the pressing plate of the upper die is squeezed. The lower end of the punch promptly stretches out of the moving hole downwards, thereby cooperates with the punching hole in the shaping cavity, and punches out a through hole at the bottom of the groove formed by shaping. That is to say, the utility model can complete the two processes of plate shaping and punching through one set of molds, thereby significantly reducing the mold manufacturing cost and improving the production efficiency of stamping and forming.

Preferably, a taper hole is coaxially connected to the lower end of the punching hole in the lower die, and the diameter of the taper hole gradually increases from top to bottom.

The punched waste can be discharged outward through the outlet cone hole. Since the outlet cone hole is a trumpet-shaped hole that gradually increases downwards, when the waste in the punching hole enters the outlet cone hole, it can be automatically discharged. It is exported to the taper hole and quickly falls to the outside to avoid the damage of the punch caused by the accumulation of waste materials in the punching hole.

As preferably, a vertical shaping head guide hole is provided on the upper mold, and a counterbore is provided at the upper end of the shaping head guide hole, and the shaping head is slidably arranged in the shaping head guide hole, and a counterbore is provided at the upper end of the shaping head. There is a limiting convex ring located in the counterbore, and the second elastic element made of polyurethane is arranged in the counterbore. The second elastic element is in the shape of a ring. One end of the punch is fixedly connected to the upper mold pressing plate, and the other end is After passing through the inner hole of the second elastic element, it fits in the moving hole of the shaping head.

In the utility model, a counterbore is arranged at the upper end of the guiding hole of the shaping head, thereby forming a stepped hole, and the shaping head is positioned in the guiding hole of the shaping head through the limiting convex ring at the upper end. The ring-shaped second elastic element made of polyurethane has good elasticity, and is not easy to be damaged and fail after long-time working.

Preferably, the first elastic element is a nitrogen gas spring whose initial elastic force can be adjusted.

In order to ensure the sequence of shaping and punching during stamping, we need to make the initial elastic force of the second elastic element greater than the initial elastic force of the first elastic element. The first elastic element composed of nitrogen spring can easily adjust its initial elastic force , so as to facilitate the assembly and debugging of the utility model.

As a preference, the guide limit mechanism includes a guide post 24 arranged on the lower side of the upper template, the guide plate is provided with a guide through hole, the guide post is fitted in the guide through hole, and the lower end of the guide post is at the same time A positioning post with a diameter larger than the guide post is arranged axially, and a positioning hole is provided on the lower die corresponding to the positioning post. When the upper die and the lower die are closed, the positioning post fits in the positioning hole. When parting the mold, the positioning column is against the binder plate, and the binder plate is suspended on the guide column.

When the upper mold and the lower mold are closed, the positioning column protruding from the binder plate enters the positioning hole of the lower mold first, so as to play the role of guiding and positioning between the upper and lower molds; when the binder plate is in contact with the lower mold , the lower mold pushes the binder plate, and the guide column forms a good guiding effect on the binder plate at this time. That is to say, the guiding column and the positioning column integrally arranged in the utility model can simultaneously play the roles of positioning the upper and lower molds and guiding the binder plate. In particular, the diameter of the positioning post is larger than the diameter of the guiding post, so that the positioning post can play a limiting role on the binder plate.

Therefore, the utility model has the following beneficial effects: shaping and punching can be completed at the same time, which is beneficial to simplify the process, save mold manufacturing costs, and improve production efficiency.

Description of drawings

Fig. 1 is a structural schematic diagram of an upper mold and a lower mold in a mold-parting state.

Fig. 2 is a schematic diagram of the structure when the upper mold and the lower mold are clamped and shaped.

Fig. 3 is a schematic diagram of the structure when the upper mold and the lower mold are punched together.

Among the figure: 1, upper mold 11, upper molding plate 12, upper template 121, shaping head guide hole 122, counterbore 2, lower mold 21, lower mold pressing plate 22, lower template 221, guide sleeve 222, shaping cavity 223, punch Cutting hole 224, inlay hole 23, lower module 24, export taper hole 3, binder plate 31, guide through hole 32, right platform 33, shaping hole 4, first elastic element 5, second elastic element 6, guide column 61 , positioning column 7, shaping head 71, limit convex ring 72, moving hole 8, punch 9, plate.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , a shaping and punching die structure is suitable for shaping a groove on a sheet metal part at one time, and punching a through hole at the bottom of the groove. It specifically includes an upper mold 1 and a lower mold 2. In order to facilitate processing, the upper mold 1 includes an upper mold pressing plate 11 and an upper mold plate 12, while the lower mold 2 includes a lower mold plate 22 and a lower mold pressing plate 21, and the upper surface of the lower mold plate 22 is provided with a concave The shaping cavity 222 is used for shaping the groove on the sheet metal part.

In order to avoid the shifting of the plate during shaping, we need to set a pressing plate 3 that can move up and down on the lower part of the upper template 11, and set a first elastic element 44 between the upper template 12 and the pressing plate 3 and a limitable pressing material. The guide limit mechanism of plate 3 downward stroke. Specifically, the guide limit mechanism includes four guide columns 6 arranged at the four corners of the lower side of the upper template 12, the binder plate 3 is provided with guide through holes 31 at positions corresponding to the guide columns 6, and the guide columns 6 are adapted to Guide the through hole 31, so that the binder plate 3 can move up and down along the guide column 6. In addition, a positioning post 61 with a diameter greater than that of the guiding post 6 is coaxially arranged at the lower end of the guiding post 6. The guiding post 6 and the positioning post 61 form a stepped shape, so that when the upper mold 1 and the lower mold 2 are in the mold-parting state, the pressing The plate 3 is suspended on the guide column 6 , and the positioning column 61 abuts against the underside of the binder plate 3 , thereby defining a secondary punching gap between the binder plate 3 and the upper template 12 . Of course, we also need to set a guide sleeve 221 with a positioning hole corresponding to the positioning column 6 on the lower template 22. When the upper mold 1 and the lower mold 2 are closed, the positioning column 61 enters and fits in the positioning hole.

In addition, the first elastic element 4 preferably adopts a nitrogen spring to facilitate the adjustment of the initial elastic force of the first elastic element 4. One end of the nitrogen spring is fixed on the upper template 12, and the other end of the nitrogen spring can be stretched against the pressing material tightly. plate 3, thereby forming an initial elastic force on the binder plate 3, and the first elastic element 4 drives the binder plate 3 to move down and separate from the upper template 12 to form a secondary punching gap.

Further, we need to set a vertical shaping head guide hole 121 on the upper template 12, set a counterbore 122 at the upper end of the shaping head guide hole 121, set a shaping head 7 that can move up and down in the shaping head guide hole 121, and The upper end of the shaping head 7 is provided with a position-limiting protruding ring 71 in the counterbore. Of course, the height of the position-limiting protruding ring 71 will be less than the depth of the counterbore 122, so that the position-limiting protruding ring 71 in the counterbore 122 and the upper mold pressing plate Form gap between 12, so that shaping head 7 can move up and down. In addition, we also need to set a shaping hole 32 on the binder plate 3 at the position corresponding to the shaping head 7 , and the lower end of the shaping head 7 protruding downward from the shaping head guide hole 121 fits in the shaping hole 32 . That is to say, when the upper mold 1 and the lower mold 2 are in the split state, the lower end of the shaping head 7 retracts into the shaping hole 32 . In order to make the shaping head 7 and the shaping cavity 222 on the lower mold 2 cooperate to shape the sheet metal, we need to set a second elastic element 5 made of polyurethane in the counterbore 122 at the upper end of the guiding hole 121 of the shaping head. The second elastic element 5 is located in the space between the limiting protrusion ring 71 and the upper molding plate 11 in the counterbore 122 .

In order to realize the punching of sheet metal parts, we can set a stepped moving hole 72 with a large top and a small bottom on the shaping head 7, and a punch 8 is set in the moving hole 72, and the upper end of the punch 8 is fixedly connected to the upper mold platen 11 Above, the lower end of the punch 8 passes down through the second elastic member 5 and fits in the small hole at the lower end of the moving hole 72 of the shaping head 7 . Of course, the second elastic element 5 can be made into an annular shape, so that the punch 8 can pass through the inner hole of the second elastic element 5 downward. In addition, a punching hole 223 for punching out a through hole on the sheet metal part is provided at the bottom of the shaping cavity 222 of the lower die 2, and the edge of the punching hole 223 constitutes a cutting edge when punching. The lower template 22 can adopt a splicing structure. We can set an inlay hole 224 on the lower template 22, and a lower module 23 is embedded in the inlay hole 224, and the shaping cavity 222 and punching hole 223 are arranged on the lower module 23. In this way, the lower module 23 can be made of high-strength mold steel such as Cr12, and the lower module 23 has higher hardness through heat treatment, so as to form a sharp cutting edge, while the lower template 22 can be made of No. 45 steel It is not only beneficial to reduce the material cost of the mould, but also facilitates the processing and manufacturing of the lower template 22.

When shaping and punching is required, the partially formed sheet metal parts or plates are first placed in the shaping cavity 222 of the lower mold 2, and then the upper mold 1 and the lower mold 2 start to close to the mold, as shown in Figure 2 and Figure 3 At this time, the pressing plate 3 first presses the plate 9, so that the plate is firmly positioned, which is convenient for the shaping head 7 to shape the plate. As the upper mold 1 and the lower mold 2 approach gradually, the distance between the upper mold plate 12 and the pressing plate 3 gradually decreases, and the first elastic element 4 is squeezed. 32 protrudes downwards, and the shaping head 7 cooperates with the shaping cavity 222 on the lower mold 2 to shape the plate 9, so that the plate 9 forms a concave groove. When the shaping head 7 moves in place relative to the lower mold 2, the lower side of the plate 9 is completely attached to the inner side wall of the shaping cavity 222. At this time, a complete groove is formed on the plate 9, and the shaping head 7 cannot continue to move relative to the lower mold 2. , the lower mold 2 exerts an upward force on the shaping head 7, so that the second elastic element 5 between the shaping head 7 and the upper mold pressing plate 12 is squeezed, and at this time the shaping head 7 moves upward relative to the upper template 12, and the shaping The lower end of the punch 8 in the head 7 protrudes downwards from the moving hole 72, so as to cooperate with the punching hole 223 in the shaping cavity 222, and punch out a through hole at the bottom of the groove formed by the shaping of the plate 9.

It should be noted that we can set the lead-out taper hole 24 coaxially connected to the lower end of the punching hole 223 in the lower die 2, the upper end of the lead-out taper hole 24 is smoothly connected with the punching hole 223, and the diameter of the lead-out taper hole 24 It gradually increases from top to bottom in the shape of a bell mouth. Like this, the waste material that stays in the punching hole 223 after punching can be smoothly and automatically discharged outwards through the outlet taper hole 24, avoiding the damage of the punch 8 caused by the accumulation of waste materials in the punching hole 223.

In addition, we need to make the first elastic element 4 have sufficient pre-tightening elastic force to ensure that the pressing plate 3 has sufficient pressure on the sheet, so as to avoid the sheet from shifting during shaping. In addition, the pre-tightening elastic force of the second elastic element 5 should be greater than the sum of the elastic force of the first elastic element 4 when the shaping is completed and the punching force required by the punch 8 to ensure that the shaping head 7 will not Retract, and make the punch 8 have enough supporting force when starting punching. Certainly, the secondary punching gap between the blanking plate 3 and the upper template 12 should be greater than the sum of the moving stroke of the shaping head 7 relative to the blanking plate 3 and the moving stroke of the punch 8 relative to the shaping head 7 .

Claims (5)

1. a kind of shaping punching die structure, including upper mold（1）With equipped with shaping cavity（222）Lower die（2）, upper mold（1）Packet Include upper molded plate（11）And cope plate（12）, characterized in that in the shaping cavity（222）Bottom be equipped with hole punching（223）, The cope plate（12）Lower part be equipped with moveable holding pad（3）, in the cope plate（12）And holding pad（3）Between be equipped with First elastic element（4）And the guide and limit mechanism that holding pad moves down stroke can be limited, first elastic element（4）Make pressure Flitch（3）It moves down and cope plate（12）Separation, the guide and limit mechanism make cope plate（12）And holding pad（3）Between form two Secondary punch clearance, the holding pad（3）It is equipped with shaping hole（32）, the cope plate（12）It is fitted in equipped with lower end described whole Shape hole（32）Interior shaping head（7）, in the shaping head（7）With upper molded plate（11）Between be equipped with the second elastic element（5）, institute State shaping head（7）It is equipped with moving hole（72）, the moving hole（72）Interior be equipped with is fixed in upper molded plate（11）On punch （8）.

2. a kind of shaping punching die structure according to claim 1, characterized in that in lower die（2）It is interior to be equipped with coaxially It is connected to hole punching（223）The export taper hole of lower end（24）, the export taper hole（24）Aperture gradually increase from top to bottom.

3. a kind of shaping punching die structure according to claim 1, characterized in that in cope plate（12）It is vertical to be equipped with Shaping head pilot hole（121）, in shaping head pilot hole（121）Upper end be equipped with counterbore（122）, the shaping head（7）It can slide It is arranged dynamicly in shaping head pilot hole（121）It is interior, in shaping head（7）Upper end be equipped be located at counterbore（122）Interior position limiting convex ring （71）, using the second elastic element made of polyurethane（5）It is arranged in counterbore（122）It is interior, the second elastic element（5）In annulus Shape, the punch（8）One end and upper molded plate（11）It is fixedly connected, the other end is passed down through the second elastic element（5）Endoporus After fit in shaping head（7）Moving hole（72）It is interior.

4. a kind of shaping punching die structure according to claim 1 or 2 or 3, characterized in that first elastic element （4）For the nitrogen gas spring of initial elastic force is adjusted.

5. a kind of shaping punching die structure according to claim 1 or 2 or 3, characterized in that the guide and limit mechanism Including being arranged in cope plate（12）The guide post of downside（6）, the holding pad（3）It is equipped with guide through hole（31）, guide post（6） Fit in guide through hole（31）It is interior, in guide post（6）Lower end coaxially be equipped with diameter be more than guide post positioning column（61）, Lower die（2）Upper and positioning column（61）Corresponding position is equipped with location hole, works as upper mold（1）And lower die（2）When molding, positioning column（61）Adaptation In location hole, work as upper mold（1）And lower die（2）When dividing mould, positioning column（61）Against holding pad（3）, holding pad（3）It is suspended on and leads Xiang Zhu（6）On.