Injection mold capable of eliminating mold opening rubber powder
By adopting an inclined runner and knife-edge injection gate design in the injection mold, the problems of residual glue on the sprue surface and damage to the injection insert are solved, achieving efficient demolding and long service life of the injection insert.
Patent Information
- Application Number
- CN202610046148.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-14
- Publication Date
- 2026-03-27
AI Technical Summary
Existing injection molds are prone to causing residual plastic material to protrude from the sprue surface and damage to the injection inserts during demolding, resulting in a short service life.
The inclined flow channel structure and knife-shaped injection nozzle design, combined with the fracture surfaces of acute and obtuse angle knife edges, ensure that the material breaks flat during demolding and avoids limiting and scratching.
It effectively reduces material protrusion, extends the service life of the insert, and improves demolding efficiency.
Smart Images
Figure CN121733762A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of injection mold technology, and in particular to an injection mold that eliminates mold opening powder. Background Technology
[0002] A plastic injection mold, which eliminates the need for mold opening powder, is a tool used to process plastic products. It enables mass production by imparting specific shapes and precise dimensions to plastics and is widely used in the automotive, home appliance, and electronics industries. Its core structure includes a moving mold, a fixed mold, and systems for gating, temperature control, and ejection.
[0003] Currently, PCTG material is generally used for injection molding of plastic parts such as e-cigarette mouthpieces. PCTG material is a new type of non-crystalline thermoplastic engineering plastic that is lightweight, high-strength, has a good odor at high temperatures, does not contain bisphenol A, will not deform under repeated heating, has good disinfection properties, and can be in contact with water for a long time.
[0004] However, existing injection molds that eliminate mold opening powder are generally of a parallel injection structure. When demolding injection molded parts such as electronic cigarette mouthpieces, the problem of residual molded material protruding from the sprue surface due to the hard pulling of the sprue material at conventional injection points is significant. Furthermore, when the injection insert detaches from the mold core, the injection port of the insert is prone to colliding with the protruding molded material at the product's injection point, causing damage to the injection insert and a short service life. Therefore, there is an urgent need to develop an injection mold that eliminates mold opening powder to meet practical application needs. Summary of the Invention
[0005] The purpose of this invention is to provide an injection mold that eliminates mold opening powder, thereby solving the above-mentioned defects.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An injection mold for eliminating mold opening powder includes an upper mold plate, a lower mold plate, and a mold core disposed between the upper and lower mold plates. The mold core includes an upper mold core and a lower mold core. A cavity is formed between the upper and lower mold cores. A glue injection insert is provided in the cavity. The glue injection insert has a runner inside. The runner is arranged in an inclined structure from top to bottom inside the glue injection insert. A glue injection port is formed at one end of the runner near the side wall of the glue injection insert. The runner forms a conductive structure with the cavity through the glue injection port. The edges of the glue injection port are all knife-shaped structures. The lower edge of the glue injection port is a first knife edge with an acute angle and a second knife edge with an obtuse angle.
[0007] As a further embodiment, the top surface of the upper mold core is provided with a mounting groove that matches the injection insert. The top of the injection insert is embedded in the mounting groove, and the bottom of the injection insert extends into the cavity between the upper mold core and the lower mold core.
[0008] As a further embodiment of the above description, the top of the upper template is provided with a top plate and a sprue plate from top to bottom. The top plate is provided with a hot nozzle inside. The hot nozzle has a columnar structure. The bottom end of the hot nozzle extends through the top plate and the sprue plate to the top of the glue inlet insert. The top surface of the glue inlet insert is provided with a glue inlet channel. The bottom end of the hot nozzle forms a conductive structure with the flow channel through the glue inlet channel.
[0009] As a further embodiment of the above description, the sprue plate is provided with several sprue pins inside. The sprue pins are vertically arranged inside the sprue plate, and the bottom end of the sprue pin is a truncated cone. The truncated cone extends through the sprue plate to the glue channel on the top surface of the glue insert via the sprue pin.
[0010] As a further embodiment of the above description, the sprue plate is provided with several sleeves inside. The sleeves have hollow through holes and a guide hole at the bottom end that matches the hot nozzle. The sleeves extend through the sprue plate to the top surface of the glue insert. The sleeves can be fitted onto the outer surface of the hot nozzle, and the bottom end of the hot nozzle is clearance-fitted with the guide hole at the bottom of the sleeve.
[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: the flow channel inside the glue inlet is set in an inclined structure, and the glue inlet at one end is opened on the side wall of the glue inlet. At the same time, the edges of the glue inlet are all knife-shaped structures. The lower edge of the glue inlet is a first knife edge with an acute angle and a second knife edge with an obtuse angle. When the sprue is pulled out, the sprue can form a flat fracture surface between the first and second knife edges when it is pulled upward. The height of the first and second knife edges determines the height of the glue protrusion, which can effectively reduce the obvious protrusion of the glue. At the same time, when the glue inlet is withdrawn, the protrusion of the product can slide out along the inclined surface of the first and second knife edges, which effectively avoids the glue inlet from being limited and scraped by the glue protrusion, and increases the service life of the glue inlet. Attached Figure Description
[0012] Figure 1 This is a cross-sectional view of an injection mold for eliminating mold opening powder as described in this embodiment; Figure 2 This is an exploded view of the structure of an injection mold for eliminating mold opening powder as described in this embodiment; Figure 3 This is a magnified schematic diagram of a portion of structure A in diagram 2; Figure 4 This is a cross-sectional view of the adhesive insert described in this embodiment; Figure 5 This is a magnified schematic diagram of the structure of B in section 4; Figure 6 This is a schematic diagram of the structure of the glue inlet insert when it is pulled out of the water outlet in this embodiment; Figure 7 This is a schematic diagram of the structure when the glued insert is retracted as described in this embodiment; Figure 8 This is a schematic diagram of the structure when the glued insert is retracted in the prior art; In the diagram: 1-Top plate, 2-Sprue plate, 3-Upper mold plate, 4-Lower mold plate, 5-Mold core, 51-Upper mold core, 511-Mounting groove, 52-Lower mold core, 53-Cavity, 6-Injection insert, 61-Runner, 62-Injection channel, 63-Injection port, 631-First cutting edge, 632-Second cutting edge, 7-Hot nozzle, 8-Nose, 81-Thrust hole, 82-Guide hole, 9-Sprue pin, 91-Frustum section, 10-Sprue, 101-Fracturing surface. Detailed Implementation
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0014] For this embodiment, please refer to Figures 1-8 The specific implementation of an injection mold for eliminating mold opening powder includes an upper mold plate 3, a lower mold plate 4, and a mold core 5 disposed between the upper mold plate 3 and the lower mold plate 4. The mold core 5 includes an upper mold core 51 and a lower mold core 52. A cavity 53 is formed between the upper mold core 51 and the lower mold core 52, and a glue injection insert 6 is provided in the cavity 53. The specific structure of the glued insert 6 is as follows: Figure 4-5 As shown, the interior of the glue-injecting insert 6 is provided with a flow channel 61. The flow channel 61 is arranged in an inclined structure from top to bottom inside the glue-injecting insert 6. A glue injection port 63 is opened at one end of the flow channel 61 near the side wall of the glue-injecting insert 6. The flow channel 61 forms a conductive structure with the cavity 53 through the glue injection port 63. The edges of the glue injection port 63 are all knife-shaped structures. The lower edge of the glue injection port 63 is a first knife edge 631 with an acute angle and a second knife edge 632 with an obtuse angle.
[0015] The flow channel 61 inside the glue inlet insert 6 is set in an inclined structure, and the glue inlet 63 at one end is opened on the side wall of the glue inlet insert 6. At the same time, the edges of the glue inlet 63 are all knife-shaped structures. The lower edge of the glue inlet 63 is a first knife edge 631 with an acute angle and a second knife edge 632 with an obtuse angle. When the sprue 10 is pulled out, the sprue 10 can form a flat fracture surface 101 between the first knife edge 631 and the second knife edge 632 when it is pulled upward. The height of the first knife edge 631 and the second knife edge 632 determines the height of the glue protrusion, which can effectively reduce the obvious protrusion of the glue. At the same time, when the glue inlet insert 6 is withdrawn, the protrusion of the product can slide out along the inclined surface of the first knife edge 631 and the second knife edge 632, which effectively avoids the glue inlet insert 6 from being limited and scraped by the glue protrusion, and increases the service life of the glue inlet insert 6.
[0016] Specific examples Figure 2 As shown, the top surface of the upper mold core 51 has an installation groove 511 that matches the injection insert 6. The top of the injection insert 6 is embedded in the installation groove 511, and the bottom of the injection insert 6 extends into the cavity 53 between the upper mold core 51 and the lower mold core 52. The top of the upper mold plate 3 is provided with a top plate 1 and a sprue plate 2 from top to bottom. The top plate 1 has a hot runner 7 inside. The hot runner 7 has a columnar structure. The bottom of the hot runner 7 extends through the top plate 1 and the sprue plate 2 to the top of the injection insert 6. The top surface of the injection insert 6 has an injection channel 62. The bottom of the hot runner 7 forms a conductive structure with the runner 61 through the injection channel 62.
[0017] Specific examples Figure 3 As shown, the interior of the sprue plate 10 2 is provided with several sprue pins 9. The sprue pins 9 are vertically arranged inside the sprue plate 10 2. The bottom end of the sprue pin 9 is a truncated cone 91. The truncated cone 91 extends through the sprue pin 9 through the sprue plate 10 2 to the glue inlet channel 62 on the top surface of the glue inlet insert 6. The interior of the sprue plate 10 2 is provided with several sleeves 8. The interior of the sleeve 8 is a hollow sleeve through hole 81. The bottom end of the sleeve 8 is provided with a through hole 82 that matches the hot nozzle 7. The sleeve 8 extends through the sprue plate 10 2 to the top surface of the glue inlet insert 6. The sleeve 8 can be sleeved on the outer surface of the hot nozzle 7, and the bottom end of the hot nozzle 7 and the through hole 82 at the bottom of the sleeve 8 are clearance-fitted.
[0018] A mold opening process for an injection mold that eliminates mold opening powder: The hot nozzle 7 is pulled out by driving the top plate 1, and then the bushing 8 and the sprue pin 9 are pulled upward by driving the sprue plate 2. Since the truncated cone 91 extends through the sprue pin 9 through the sprue plate 2 to the sprue channel 62 on the top surface of the injection insert 6, the sprue 10 can wrap around the surface of the truncated cone 91. When the sprue pin 9 is pulled out, the sprue 10 can be pulled out simultaneously. At this time, the lower edge of the injection port 63 and the first cutting edge 631 and the second cutting edge 632, which are respectively acute and obtuse angles, can break the fracture surface 101 of the sprue 10 along the first cutting edge 631 and the second cutting edge 632. Figure 6 As shown, and in this embodiment, the machining accuracy of the first cutting edge 631 and the second cutting edge 632 is 0.05 mm. The height of the rubber protrusion that is broken along the first cutting edge 631 and the second cutting edge 632 is determined by the height of the first cutting edge 631 and the second cutting edge 632. Therefore, the rubber protrusion of the product is very small. Then, by driving the upper mold plate 3, the upper mold core 51 and the lower mold core 52 are separated. At the same time, the glue insert 6 can follow the upper mold core 51 to separate from the product. During the separation process, the glue protrusions of the product can slide out along the inclined surfaces of the first cutting edge 631 and the second cutting edge 632. Figure 7As shown, this effectively prevents the glue insert 6 from scratching against the glue protrusion, thus increasing the service life of the glue insert 6.
[0019] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the inventive concept, and all such modifications and substitutions should be considered within the scope of protection of the present invention.
Claims
1. An injection mold for eliminating mold opening powder, comprising an upper mold plate, a lower mold plate, and a mold core disposed between the upper mold plate and the lower mold plate, the mold core comprising an upper mold core and a lower mold core, wherein a cavity is formed between the upper mold core and the lower mold core, characterized in that: The cavity is provided with a glue inlet insert, and the inside of the glue inlet insert is provided with a flow channel. The flow channel is arranged in an inclined structure from top to bottom inside the glue inlet insert. A glue injection port is opened at one end of the flow channel near the side wall of the glue inlet insert. The flow channel forms a conductive structure with the cavity through the glue injection port. The edges of the glue injection port are all knife-shaped structures. The lower edge of the glue injection port is a first knife edge with an acute angle and a second knife edge with an obtuse angle.
2. The injection mold for eliminating mold opening powder according to claim 1, characterized in that: The top surface of the upper mold core is provided with a mounting groove that matches the glue insert. The top of the glue insert is embedded in the mounting groove, and the bottom of the glue insert extends into the cavity between the upper mold core and the lower mold core.
3. The injection mold for eliminating mold opening powder according to claim 2, characterized in that: The top of the upper template is provided with a top plate and a sprue plate from top to bottom. The top plate is provided with a hot nozzle inside. The hot nozzle is a columnar structure. The bottom end of the hot nozzle extends through the top plate and the sprue plate to the top of the glue inlet insert. The top surface of the glue inlet insert is provided with a glue inlet channel. The bottom end of the hot nozzle forms a conductive structure with the flow channel through the glue inlet channel.
4. The injection mold for eliminating mold opening adhesive powder according to claim 3, characterized in that: The sprue plate has several sprue pins inside. The sprue pins are vertically arranged inside the sprue plate. The bottom end of the sprue pin is a truncated cone. The truncated cone extends through the sprue plate to the glue channel on the top surface of the glue insert.
5. The injection mold for eliminating mold opening adhesive powder according to claim 3, characterized in that: The sprue plate has several sleeves inside. The sleeves have hollow through holes. The bottom of the sleeve has a through hole that matches the hot nozzle. The sleeves extend through the sprue plate to the top surface of the glue insert. The sleeves can be fitted onto the outer surface of the hot nozzle, and the bottom of the hot nozzle is clearance-fitted with the through hole at the bottom of the sleeve.