Plastic parts hot cutting and punching die
By using high-temperature trimming of the heated punch and trimming seat, the problem of burrs during the punching process of plastic parts is solved, achieving efficient burr-free punching.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARDA INTELLIGENT TECH CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-26
AI Technical Summary
Burrs are easily generated during the punching process of existing plastic parts, which affects production efficiency.
The plastic part hot cutting punching die with heated punch reduces burrs by using the high temperature softening effect of the punch through the cooperation of the upper and lower dies, and the edge of the through hole is trimmed by the high temperature of the trimming seat.
Effectively avoids burrs on through-holes in plastic parts, improving production efficiency.
Smart Images
Figure CN224275387U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of plastic parts, and in particular to a hot-cutting punching mold for plastic parts. Background Technology
[0002] After molding (such as vacuum forming, thermoforming, or other processes), some plastic parts require punching. Currently, the punching process used for plastic parts is cold cutting, which involves the upper die's punch and the lower die's punching die working together to directly cut the plastic part, creating the corresponding through holes. However, due to misfitting errors between the punch and the punching die, this punching method easily results in burrs forming on the through holes, requiring subsequent trimming and affecting production efficiency.
[0003] In view of the above problems, it is necessary to study a hot-cutting punching die for plastic parts, which is used to punch holes in plastic parts and can avoid burrs on the through holes of plastic parts. Utility Model Content
[0004] The purpose of this utility model is to provide a hot-cutting punching mold for plastic parts, which is used to punch holes in plastic parts and can prevent the through holes of plastic parts from having burrs.
[0005] To achieve the above objectives, the solution of this utility model is:
[0006] A hot-cutting punching die for plastic parts includes an upper die and a lower die that slide together. The upper die has multiple punches and a punch heating device for heating each punch. The lower die is located below the upper die and is provided with a punching die, which has punching holes that are movably inserted and engaged with each punch.
[0007] The upper mold also has an upper fixing component, on which each punch is fixedly installed.
[0008] The punch is divided into a large punch and a small punch. The small punch is smaller than the large punch. The punch heating device includes a first heating element that is respectively matched with each large punch and a second heating element that is matched with the upper fixing component. The first heating element directly conducts heat with the large punch, and the second heating element conducts heat with the small punch through the upper fixing component.
[0009] The upper die also has a stripper seat that slides with each punch respectively. The stripper seat is located below the upper fixing component, and multiple stripper springs are sandwiched between the stripper seat and the upper fixing component.
[0010] The upper fixing component is provided with multiple upper connecting holes, and the inner wall of the upper connecting holes forms an upper retaining edge; the stripping seat is fixedly fitted with multiple upper connecting bolts, each upper connecting bolt is respectively inserted into each upper connecting hole of the upper fixing component, and the head of each upper connecting bolt and the upper retaining edge of each upper connecting hole form an upper and lower limiting fit; each stripping spring is respectively sleeved on each upper connecting bolt.
[0011] The upper mold also has a trimming seat, which is located below the upper fixing component and fixedly connected to the upper fixing component. The trimming seat movably houses the punching mold, and the trimming seat is equipped with a trimming heating device for heating the trimming seat.
[0012] The lower die also has a lower fixing component. The punching die is fixedly installed on the upper side of the lower fixing component. The lower fixing component has a blanking channel that communicates with each punching hole of the punching die. The lower fixing component is equipped with a lower die heating device.
[0013] The lower die also has an ejector seat, which is located above the lower fixed component and movably sleeves the punching die. An ejector spring is sandwiched between the ejector seat and the lower fixed component.
[0014] The lower fixing component is provided with multiple lower connecting holes, and the inner wall of the lower connecting holes forms a lower retaining edge; the stripper seat is fixedly fitted with multiple lower connecting bolts, each lower connecting bolt is respectively inserted into each lower connecting hole of the lower fixing component, and the head of each lower connecting bolt forms an upper and lower limiting fit with the lower retaining edge of each lower connecting hole; each top spring is respectively sleeved on each lower connecting bolt.
[0015] The top of the upper mold and the bottom of the lower mold are respectively fitted with an upper heat insulation plate and a lower heat insulation plate.
[0016] With the above solution, when using the hot-cutting punching die of this utility model to punch plastic parts, the upper die and the lower die are respectively fitted onto the slider and worktable of the press. The plastic part to be punched is first placed on the punching die of the lower die; then the press drives the upper die to move downward, so that each punch of the upper die passes through the plastic part and engages with each punching hole of the punching die of the lower die, thereby forming corresponding through holes in the plastic part; next, the press drives the upper die to move upward and reset, so that the upper die is detached from the plastic part; finally, the punched plastic part is taken out. The upper mold has a punch heating device that heats each punch to a preset punching temperature range. When the plastic part is punched using this hot-cutting punching mold, the high temperature of the punch softens the plastic part, allowing it to punch smoothly and reduce burrs. Simultaneously, the high temperature also allows the punch to trim and remove burrs from the through-holes formed in the plastic part. Therefore, when the plastic part is punched using this hot-cutting punching mold, burrs are avoided from forming in the through-holes. Attached Figure Description
[0017] Figure 1 Structural breakdown of this utility model Figure 1 .
[0018] Figure 2 Structural breakdown of this utility model Figure 2 .
[0019] Figure 3 This is a perspective view of the present invention.
[0020] Figure 4 This is a front view of the present invention.
[0021] Figure 5 for Figure 4 AA sectional view.
[0022] Figure 6 This is a top view of the upper mold and upper heat insulation plate of this utility model.
[0023] Figure 7 for Figure 6 BB cross-sectional view.
[0024] Figure 8 This is a top view of the lower mold, lower heat insulation plate, and support block of this utility model.
[0025] Figure 9 for Figure 8 CC section view.
[0026] Label Explanation:
[0027] Upper die 1, large punch 11, small punch 12, guide post 13, upper fixing assembly 14, upper connecting hole 141, upper stop 1411, upper die base 1401, upper pad 1402, upper clamping plate 1403, punch heating device 15, first heating element 151, second heating element 152, stripper seat 16, upper connecting bolt 161, stripper spring 17, trimming seat 18, trimming heating device 19.
[0028] Lower die 2, punching die 21, punching hole 211, locating pin 212, guide sleeve 22, lower fixing assembly 23, lower pad 2301, lower die base 2302, blanking channel 231, lower connecting hole 232, lower stop 2321, lower die heating device 24, ejector seat 25, lower connecting bolt 251, ejector spring 26.
[0029] Upper heat insulation panel 3,
[0030] Lower heat insulation panel 4,
[0031] Support block 5. Detailed Implementation
[0032] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.
[0033] like Figures 1 to 9As shown, this utility model discloses a hot-cutting punching mold for plastic parts, which includes an upper mold 1 and a lower mold 2 that slide together. The upper mold 1 has multiple punches and a punch heating device 15 for heating each punch. The lower mold 2 is located below the upper mold 1 and is provided with a punching mold 21. The punching mold 21 has punching holes 211 that are movably inserted and engaged with each punch. The punching mold 21 may be provided with multiple positioning pins 212 for insertion and positioning with the plastic parts. When using the hot-cutting punching die of this utility model to punch plastic parts, the upper die 1 and the lower die 2 are respectively fitted onto the slider and worktable of the press. The plastic part to be punched is first placed on the punching die 21 of the lower die 2. Then the press drives the upper die 1 to move downward, so that each punch of the upper die 1 passes through the plastic part and engages with each punching hole 211 of the punching die 21 of the lower die 2, thereby forming corresponding through holes in the plastic part. Next, the press drives the upper die 1 to move upward and reset, so that the upper die 1 is detached from the plastic part. Finally, the punched plastic part is taken out. In this invention, the upper mold 1 has a punch heating device 15 for heating each punch. The punch heating device 15 can heat the punch to a preset punching temperature range. Thus, when the plastic part is punched using the hot cutting punching mold of this invention, the high temperature of the punch itself softens the plastic part, allowing the punch to punch smoothly and reduce the generation of burrs. At the same time, the high temperature of the punch itself can also trim the through holes formed in the plastic part and remove burrs. Therefore, when the plastic part is punched using the hot cutting punching mold of this invention, burrs can be avoided in the through holes of the plastic part.
[0034] In an embodiment of this utility model, the upper mold 1 further has a guide post 13, and the lower mold 2 further has a guide sleeve 22 that slides with the guide post 13 so that the upper mold 1 and the lower mold 2 can be accurately connected.
[0035] In an embodiment of this utility model, the upper mold 1 further includes an upper fixing component 14, on which each punch and guide post 13 is fixedly installed. The upper fixing component 14 may include an upper mold base 1401, an upper pad 1402, and an upper clamping plate 1403 connected sequentially from top to bottom. The punches may be divided into large punches 11 and small punches 12, with the small punches 12 being smaller than the large punches 11. The punch heating device 15 includes a first heating element 151 that is respectively matched with each large punch 11 and a second heating element 152 that is matched with the upper fixing component 14. The first heating element 151 directly conducts heat with the large punches 11, and the second heating element 152 conducts heat with the small punches 12 through the upper fixing component 14. The second heating element 152 may be embedded in the upper pad 1402 of the upper fixing component 14.
[0036] In an embodiment of this utility model, the upper mold 1 further includes a stripper seat 16 that slides with each punch respectively. The stripper seat 16 is located below the upper fixing component 14, and a plurality of stripper springs 17 are sandwiched between the stripper seat 16 and the upper fixing component 14. The upper fixing component 14 is provided with a plurality of upper connecting holes 141, and the inner wall of the upper connecting holes 141 forms an upper retaining edge 1411. The stripper seat 16 is fixedly fitted with a plurality of upper connecting bolts 161, and each upper connecting bolt 161 is respectively inserted into each upper connecting hole 141 of the upper fixing component 14. The head of each upper connecting bolt 161 and the upper retaining edge 1411 of each upper connecting hole 141 form an upper and lower limiting fit to prevent the stripper seat 16 from completely separating from the upper fixing component. Each stripper spring 17 is respectively sleeved on each upper connecting bolt 161 to prevent the stripper spring 17 from shifting and falling off. When the press drives the upper mold 1 to move downward so that each punch of the upper mold 1 passes through the plastic part and engages with each punching hole 211 of the punching die 21 of the lower mold 2, that is, when the upper mold 1 and the lower mold 2 cooperate to punch the plastic part, the stripper spring 17 is compressed; thereafter, when the press drives the upper mold 1 to move upward to reset, the stripper spring 17 will unfold and drive the stripper seat 16 to move downward relative to the upper fixed assembly 14 and the punch, so that the stripper seat 16 applies force to the punched plastic part to ensure that the plastic part is removed from the punch of the upper mold 1 and the trimming seat 18 described below.
[0037] In an embodiment of this utility model, the upper mold 1 may further include a trimming seat 18, which is located below and fixedly connected to the upper fixing component 14. The trimming seat 18 movably houses the stripper seat 16 and the punching die 21. The trimming seat 18 is equipped with a trimming heating device 19 for heating the trimming seat 18, which may be embedded in the trimming seat 18. When the press drives the upper mold 1 to move downward so that each punch of the upper mold 1 passes through the plastic part and engages with the lower mold... When the punching holes 211 of the punching die 21 of die 2 are inserted and engaged, that is, when the upper die 1 and the lower die 2 engage to punch the plastic part, the trimming seat 18 can engage with the punching die 21 to trim the edge of the plastic part; and since the trimming seat 18 is equipped with a trimming heating device 19 for heating the trimming seat 18, the trimming heating device 19 can heat the trimming seat 18 to a suitable temperature, so that the trimming seat 18 can smoothly punch the edge of the plastic part.
[0038] In an embodiment of this utility model, the lower mold 2 further includes a lower fixing component 23. The punching mold 21 and the guide sleeve 22 are fixedly installed on the upper side of the lower fixing component 23. The lower fixing component 23 is provided with a material discharge channel 231 that communicates with each punching hole 211 of the punching mold 21, so that the plastic waste formed by punching can fall out from the material discharge channel 231. The lower fixing component 23 may include a lower pad 2301 and a lower mold base 2302 arranged sequentially from top to bottom. The lower pad 2301 may be provided with a lower mold heating device 24 for heating the lower pad 2301, so that the lower pad 2301 can preheat the plastic part placed on the punching mold 21, so that the plastic part can be punched better. The lower mold heating device 24 may be embedded in the lower pad 2301.
[0039] In an embodiment of this utility model, the lower mold 2 further includes an ejector seat 25, which is located above the lower fixing component 23 and movably sleeves the punching mold 21. An ejector spring 261 is sandwiched between the ejector seat 25 and the lower fixing component 23. The lower fixing component 23 may have multiple lower connecting holes 232, and the inner wall of the lower connecting holes 232 forms a lower stop 2321. The stripper seat 16 is fixedly fitted with multiple lower connecting bolts 251, each lower connecting bolt 251 passing through each lower connecting hole 232 of the lower fixing component 23. The head of each lower connecting bolt 251 and the lower stop 2321 of each lower connecting hole 232 form an upper and lower limiting fit to prevent the ejector seat 25 from completely separating from the lower fixing component 23. Each ejector spring 261 is sleeved on each lower connecting bolt 251 to prevent the ejector spring 261 from shifting and falling off. When the press drives the upper mold 1 to move downward so that each punch of the upper mold 1 passes through the plastic part and engages with each punching hole 211 of the punching die 21 of the lower mold 2, that is, when the upper mold 1 and the lower mold 2 cooperate to punch the plastic part, the ejector spring 261 is also compressed; thereafter, when the press drives the upper mold 1 to move upward to reset, the ejector spring 261 will unfold and drive the ejector seat 25 to move upward relative to the lower fixed component 23, so that the ejector seat 25 pushes open the trimming seat 18 of the upper mold 1.
[0040] In an embodiment of this utility model, the top of the upper mold 1 and the bottom of the lower mold 2 may be fitted with an upper heat insulation plate 3 and a lower heat insulation plate 4, respectively. The upper heat insulation plate 3 isolates the heat conduction between the upper mold 1 and the slider of the press, and the lower heat insulation plate 4 isolates the heat conduction between the lower mold 2 and the worktable of the press. In addition, a support block 5 may be fitted at the bottom of the lower mold 2. The support block 5 allows the lower mold 2 to be suspended and installed on the worktable of the press for cleaning up plastic waste.
[0041] To facilitate understanding of this utility model, the following details the specific process of punching plastic parts using the hot-cutting and punching die of this utility model:
[0042] First, the upper die 1 and the lower die 2 are respectively installed on the worktable of the slide of the press, and the guide post 13 of the upper die 1 is slidably connected to the guide sleeve 22 of the lower die 2.
[0043] Then, the plastic part to be punched is placed in the punching mold 21 of the lower mold 2, and the plastic part is engaged with each of the positioning pins 212 of the punching mold 21.
[0044] Next, the press drives the upper mold 1 to move down, so that the trimming seat 18 and the stripper seat 16 of the upper mold 1 contact the plastic part in sequence, and the stripper spring 17 is compressed so that the stripper seat 16 pre-tightens and positions the plastic part.
[0045] Next, the press continues to drive the upper die 1 to move downward, so that each punch of the upper die 1 cooperates with each punching hole 211 of the punching die 21 to punch the plastic part. At the same time, the cutting seat cooperates with the punching die to trim and cut the edge of the plastic part, and the cutting seat applies pressure to the ejector seat 25 to compress the ejector spring 261. Meanwhile, the stripper seat 16 continues to move relative to the punch, so that the stripper spring 17 continues to be compressed.
[0046] When the upper mold 1 is moved down to the lowest point, the ejector spring 261 and the stripper spring 17 are compressed to the maximum, at which time the cutting seat can abut against the lower pad 2301 of the lower mold 2.
[0047] Next, the press drives the upper mold 1 to move upward and reset. During this process, the ejector spring 261 and the stripper spring 17 release their elastic force, causing the stripper seat 16 to move downward relative to the punch and push the plastic part away from the punch. At the same time, the ejector seat 25 moves upward relative to the punching die 21 and drives the trimming seat 18 to move upward and reset.
[0048] Finally, remove the punched plastic parts.
[0049] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.
Claims
1. A hot-cutting and punching die for plastic parts, characterized in that: This includes the upper and lower molds that slide together; The upper die has multiple punches and a punch heating device for heating each punch. The lower die is located below the upper die and is equipped with a punching die. The punching die has punching holes that can be movably inserted and matched with each punch.
2. The hot-cutting and punching mold for plastic parts as described in claim 1, characterized in that: The upper mold also has an upper fixing component, on which each punch is fixedly installed.
3. The hot-cutting and punching mold for plastic parts as described in claim 2, characterized in that: The punch is divided into a large punch and a small punch. The small punch is smaller than the large punch. The punch heating device includes a first heating element that is respectively matched with each large punch and a second heating element that is matched with the upper fixing component. The first heating element directly conducts heat with the large punch, and the second heating element conducts heat with the small punch through the upper fixing component.
4. The hot-cutting and punching mold for plastic parts as described in claim 2, characterized in that: The upper die also has a stripper seat that slides with each punch respectively. The stripper seat is located below the upper fixing component, and multiple stripper springs are sandwiched between the stripper seat and the upper fixing component.
5. The hot-cutting and punching mold for plastic parts as described in claim 4, characterized in that: The upper fixing component is provided with multiple upper connecting holes, and the inner wall of the upper connecting holes forms an upper retaining edge; the stripping seat is fixedly fitted with multiple upper connecting bolts, each upper connecting bolt is respectively inserted into each upper connecting hole of the upper fixing component, and the head of each upper connecting bolt and the upper retaining edge of each upper connecting hole form an upper and lower limiting fit; each stripping spring is respectively sleeved on each upper connecting bolt.
6. The hot-cutting and punching mold for plastic parts as described in claim 1, characterized in that: The upper mold also has a trimming seat, which is located below the upper fixing component and fixedly connected to the upper fixing component. The trimming seat movably houses the punching mold, and the trimming seat is equipped with a trimming heating device for heating the trimming seat.
7. The hot-cutting and punching mold for plastic parts as described in claim 1, characterized in that: The lower die also has a lower fixing component. The punching die is fixedly installed on the upper side of the lower fixing component. The lower fixing component has a blanking channel that communicates with each punching hole of the punching die. The lower fixing component is equipped with a lower die heating device.
8. The hot-cutting and punching mold for plastic parts as described in claim 7, characterized in that: The lower die also has an ejector seat, which is located above the lower fixed component and movably sleeves the punching die. An ejector spring is sandwiched between the ejector seat and the lower fixed component.
9. The hot-cutting and punching mold for plastic parts as described in claim 8, characterized in that: The lower fixing component is provided with multiple lower connecting holes, and the inner wall of the lower connecting holes forms a lower retaining edge; the stripper seat is fixedly fitted with multiple lower connecting bolts, each lower connecting bolt is respectively inserted into each lower connecting hole of the lower fixing component, and the head of each lower connecting bolt forms an upper and lower limiting fit with the lower retaining edge of each lower connecting hole; each top spring is respectively sleeved on each lower connecting bolt.
10. The hot-cutting and punching die for plastic parts as described in claim 1 or 7, characterized in that: The top of the upper mold and the bottom of the lower mold are respectively fitted with an upper heat insulation plate and a lower heat insulation plate.