CN-121973410-A - Injection mold convenient for back-off demolding and demolding method

CN121973410ACN 121973410 ACN121973410 ACN 121973410ACN-121973410-A

Abstract

The invention relates to the technical field of injection molds, in particular to an injection mold and a demolding method convenient for back-off demolding, which comprise a cavity part which is opened and closed along a first direction, a core part which is opened and closed along a second direction and a driving mechanism for driving the core part to act, wherein the first direction and the second direction are mutually perpendicular, the core part comprises a core and an inclined top which are used for forming the inner surface of a product, the driving mechanism comprises a first sliding block and a second sliding block which slide along the second direction, the first sliding block is connected with the core, the inclined top is slidingly assembled on the second sliding block along the direction perpendicular to the second direction, the driving mechanism drives the core part to sequentially have a release stroke and a demolding stroke, the first sliding block drives the core to move so as to avoid the inclined top when the release stroke is positioned, and the inclined top is driven by the first sliding block to drive the core and the second sliding block to move so as to realize release when the release stroke is positioned. The invention can solve the technical problem of low production efficiency caused by easy attachment of products when the existing injection mold is demolded.

Inventors

LI GUIHUA
LIU BIAO
MI YONG
LIU SHANGJUN
ZHU YUXING

Assignees

东莞汇美模具制造股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260403

Claims (10)

1. The injection mold is characterized in that the core part comprises a core and an inclined top which are used for forming the inner surface of a product, the driving mechanism comprises a first sliding block and a second sliding block which slide along the second direction, the first sliding block is connected with the core, the inclined top is assembled on the second sliding block in a guiding and sliding way along the direction perpendicular to the second direction, the driving mechanism drives the core part to sequentially have a release stroke and a demolding stroke when the driving mechanism drives the core part to be demolded, the first sliding block drives the core to move along the second direction to avoid the inclined top and slide and shrink relative to the second sliding block when the driving mechanism is positioned in the release stroke so as to realize release, and the first sliding block drives the core and the second sliding block to drive the inclined top to move along the second direction when the driving mechanism is positioned in the demolding stroke.
2. The injection mold facilitating inverted buckle demolding according to claim 1, wherein at least one of the first sliding block and the mold core is provided with an inclined hole for the inclined roof to pass through, and when the first sliding block drives the mold core to move along the second direction to avoid the inclined roof, the hole wall of the inclined hole pushes the inclined roof to synchronously slide and shrink along the direction perpendicular to the second direction so as to realize releasing.
3. The injection mold for facilitating reverse mold release according to claim 2, wherein the core comprises a small diameter portion for molding an inner face of the product together with the bevel crown and a large diameter portion provided with the bevel hole, the small diameter portion being slidably fitted with a side face of the bevel crown.
4. An injection mold for facilitating reverse mold release according to claim 2 or 3, wherein the core has a molding surface for molding an inner face of the product, and further has a non-molding portion having a surface with a concave-convex knurl pattern for storing lubricating oil.
5. The injection mold facilitating reverse buckle demolding according to claim 2 or 3, wherein the driving mechanism comprises a driving assembly connected with the first sliding block and a linkage assembly connected with the driving assembly, the linkage assembly is connected with the second sliding block, when the driving mechanism is in a tripping stroke, the driving assembly drives the first sliding block to move, and when the driving mechanism is in a demolding stroke, the driving assembly drives the first sliding block to move and simultaneously drives the second sliding block to move through the linkage assembly.
6. The injection mold facilitating reverse buckle demolding according to claim 5, wherein the driving mechanism comprises a sliding rail, the linkage assembly comprises a first locking groove arranged on the driving assembly, a second locking groove arranged on the sliding rail and a locking piece slidingly assembled on the second sliding block, and the sliding direction of the locking piece relative to the second sliding block is perpendicular to the second direction; When the driving mechanism is in the release stroke, the locking piece is inserted into the second locking groove to enable the second sliding block to be fixed relative to the sliding rail, and when the driving mechanism is in the release stroke, the locking piece is inserted into the first locking groove to drive the second sliding block to move along the second direction.
7. The injection mold facilitating inverted release according to claim 6, wherein the locking piece is a locking block slidably mounted on the second slider along a direction perpendicular to the second direction, both ends of the locking block are V-shaped structures, and the first locking groove and the second locking groove are V-shaped grooves adapted to the V-shaped structures, so that switching of the locking block between the first locking groove and the second locking groove is achieved through cooperation of the V-shaped structures and the V-shaped grooves.
8. The injection mold for facilitating inverted mold release according to claim 7, wherein the slide rail is provided with a stopper for stopper-fitting with the second slider to restrict a limit position of movement of the second slider toward the cavity portion.
9. The injection mold for facilitating reverse mold release according to claim 1, 2 or 3, wherein the first direction is an up-down direction.
10. A demolding method for facilitating back-off demolding, which is characterized by being implemented by using the injection mold for facilitating back-off demolding according to any one of claims 1 to 9, and comprising the following specific steps: S1, keeping a cavity part motionless, and driving a first sliding block in a direction away from a product to enable a core to move, so as to avoid inward shrinkage of an inclined top; S2, driving the first sliding block to move and simultaneously or after driving the first sliding block to move, driving the inclined top to retract inwards along the direction perpendicular to the second direction so as to separate from the back-off inside the product; s3, driving the mold core and the inclined ejector to move in a direction away from the product for demolding; S4, opening the cavity part and taking out the product.

Description

Injection mold convenient for back-off demolding and demolding method Technical Field The invention relates to the technical field of injection molds, in particular to an injection mold convenient for back-off demolding and a demolding method. Background The injection molding machine is a main molding device for manufacturing plastic products with various shapes by using a plastic molding die from thermoplastic plastics or thermosetting plastics, and the manufacturing process mainly comprises quantitative feeding, melting plasticization, pressure injection molding, die cooling, die opening and component taking, and closing the die after taking out the finished product for the next production cycle. In actual production, as shown in fig. 1, the product 93 is often designed with a back-off 931, where the back-off 931 includes a buckle, a boss, a groove, and the like, and the back-off 931 can cause the product 93 to be unable to be pulled out smoothly along the mold opening direction after molding, so that in the mold opening and component removing process, the demolding of the back-off structure needs to be realized through a special mechanism, and component removing of the product is completed. For the tubular injection products with inversions inside and outside, in the prior art, a vertical injection mold structure with an upper mold and a lower mold is generally adopted, as shown in fig. 2 and 3, the mold mainly comprises a front mold 14 and a rear mold 15, wherein the front mold 14 only plays a role of sealing and molding, and the rear mold 15 integrates a movement mechanism for realizing demolding. Specifically, for the outside of the product, the mold cavity part and the sliding block set 12 which can be opened and closed are arranged to make lateral opening and closing movement along the direction perpendicular to the axis of the product, so that the mold cavity part is separated from the product 93, and for the back-off 931 in the product, the back-off 931 in the product is driven to make a vertical and lateral compound movement by means of the vertical ejection force provided by the injection molding machine by arranging the inclined top 5, so that the separation of the back-off 931 in the interior is completed. When the ejector plate is used, in the process of upward pushing of the ejector plate, the inclined ejector can perform upward and inward contracted compound movement, and as the plastic melt can generate packing force when being cooled and solidified in the die, the product can be driven by the inclined ejector to move upwards while the inclined ejector moves, so that interference to the movement of the product is avoided, and the cavity part is required to be demolded firstly. However, in actual use, it is found that, because a sufficient relative displacement is required between the product and the inclined top to realize separation, the situation that the back-off cannot be separated from the product sometimes occurs, and then manual intervention is still required, and subsequent automatic production cannot be performed, so that the production efficiency is reduced. In addition, because the inner space of the product is limited, in order to ensure the strength of the inclined ejector and the travel of the inclined ejector separating from the back-off, the inclination angle of the inclined ejector relative to the axis of the product is usually smaller, so that the ejection travel of the inclined ejector is usually larger, the overall thickness of the rear mold is further larger, if the product is ejected, the ejection travel can be further increased along with the upward movement of the inclined ejector, the range of the injection molding machine is easily exceeded, and the product cannot be ejected. Disclosure of Invention The invention provides an injection mold and a demolding method convenient for back-off demolding, which aim to solve the technical problem of low production efficiency caused by easy attachment of products in the existing injection mold during demolding. In order to solve the problems, the injection mold convenient for back-off demolding provided by the invention adopts the following technical scheme: The injection mold comprises a cavity part which is opened and closed along a first direction, a core part which is opened and closed along a second direction and a driving mechanism which drives the core part to act, wherein the first direction and the second direction are mutually perpendicular, the core part comprises a core and an inclined top which are used for forming the inner surface of a product, the driving mechanism comprises a first sliding block and a second sliding block which slide along the second direction, the first sliding block is connected with the core, the inclined top is assembled on the second sliding block in a sliding way along the direction perpendicular to the second direction, a releasing stroke and a releasing stroke are sequentially arrang