CN113290792B - Demoulding method and injection molding machine for plastic molding - Google Patents
Demoulding method and injection molding machine for plastic molding Download PDFInfo
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- CN113290792B CN113290792B CN202110847177.5A CN202110847177A CN113290792B CN 113290792 B CN113290792 B CN 113290792B CN 202110847177 A CN202110847177 A CN 202110847177A CN 113290792 B CN113290792 B CN 113290792B
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- injection molding
- movable rod
- mold
- core
- demolding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
- B29C45/332—Mountings or guides therefor; Drives therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/42—Removing or ejecting moulded articles using means movable from outside the mould between mould parts, e.g. robots
- B29C45/4225—Take-off members or carriers for the moulded articles, e.g. grippers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/43—Removing or ejecting moulded articles using fluid under pressure
Abstract
The invention provides a demoulding method and an injection molding machine for plastic molding, wherein the mould device comprises: the first die is internally provided with a mold core; the second mold is matched with the first mold to form an injection molding space, and the injection molding space is used for injection molding of an injection molding piece; a stripper assembly disposed on an outer surface of the core, the stripper assembly comprising: the sliding chute is arranged in the mold core, and a first opening is formed in the outer surface of the mold core; the at least one movable rod is arranged in the sliding groove in a telescopic mode; the movable rod comprises an abutting end, and the abutting end is used for abutting against the injection molding piece; when the movable rod completely enters the sliding groove, the maximum distance between the abutting end and the corresponding first opening is d, and d is larger than 0. The invention solves the problem that the push rod component is easy to damage the structure of the injection molding piece in the process of demolding the injection molding piece, and the production efficiency is reduced.
Description
Technical Field
The invention relates to the technical field of plastic molding, in particular to a demolding method and an injection molding machine for plastic molding.
Background
The injection molding part has wide application field, for example, the injection molding part can be applied to the catering industry, and particularly can be used for injection molding to form structures such as lunch boxes and the like. Specifically, the plastic product is prepared by mixing and stirring plastic raw materials, then carrying out hot melting, pouring into a mold through an injection molding opening, and carrying out cooling treatment on the plastic product by cooling to form an injection molding part in the mold. Due to the physical properties of expansion with heat and contraction with cold, the injection molded part adheres to the core of the mold, and in the prior art, the injection molded part is often worked into by means of a push rod assembly to complete the demolding.
However, since the molded injection-molded part has a thin shell, such as tableware, and the push rod assembly has a too strong force, the structure of the tableware is damaged, and more particularly, although the injection-molded part is processed too cold, in fact, the injection-molded part adhered to the mold still has a high temperature, i.e. the structure is not in a completely set state, and thus, the shape of the injection-molded part is still damaged under the action of the push rod assembly, such as scratches easily caused on the surface of the injection-molded part, and the overall aesthetic appearance of the injection-molded part is affected.
Furthermore, in the prior art, the injection molding part is usually blown by a blowing structure, so as to complete the demolding. On one hand, however, the injection molding piece may fall from the mold into the injection molding machine due to excessive blowing force, and needs to be taken out by workers, so that the working pressure is increased, and the injection molding machine needs to be stopped to take out the injection molding piece, so that the overall production efficiency is further reduced; on the other hand, when the blowing strength is too small, the demolding treatment cannot be completed, workers still need to perform timely treatment on one side, and the influence on the next injection molding caused by the fact that an injection molding part is remained on the mold is avoided, so that the production efficiency is further reduced.
Disclosure of Invention
The invention solves the problem that the push rod component is easy to damage the structure of the injection molding piece in the process of demolding the injection molding piece, and the production efficiency is reduced.
In order to solve the above problems, the present invention provides a mold apparatus for plastic molding, comprising: the first die is internally provided with a mold core; the second mold is matched with the first mold to form an injection molding space, and the injection molding space is used for injection molding of an injection molding piece; a stripper assembly disposed on an outer surface of the core, the stripper assembly comprising: the sliding chute is arranged in the mold core, and a first opening is formed in the outer surface of the mold core; the at least one movable rod is arranged in the sliding groove in a telescopic mode; the movable rod comprises an abutting end, and the abutting end is used for abutting against the injection molding piece; when the movable rod completely enters the sliding groove, the distance between the abutting end and the corresponding first opening is d, and d is larger than 0.
Compared with the prior art, the technical scheme has the following technical effects: in combination with the actual injection molding situation, on one hand, the movable rod is controlled to completely enter the sliding groove before injection molding, and the abutting end and the corresponding first opening form a distance, so that a reinforcing structure is formed between the abutting end and the first opening in the injection molding process to reinforce the structural strength of the injection molded part. Therefore, when demoulding is carried out, the abutting end can abut against the reinforcing structure, so that demoulding of the injection molding piece is successfully completed, and the overall production efficiency is improved; on the other hand, can be according to the demand of actually moulding plastics, adjust the top lean on the end with the distance between the first opening to form the additional strengthening of corresponding length, to a certain extent, further reduced the degree of difficulty of adjusting the movable rod dynamics, also can strengthen the drawing of patterns in-process, the bearing capacity of injection molding. In addition, more specifically, in the demolding process, a common demolding means can be combined with a blowing assembly to assist demolding, when the blowing of the blowing assembly is too large, the injection molded part is separated from the surface of the core in a short time, and the injection molded part falls off, but in combination with the technical scheme, the movable rod can be controlled to extend out of the corresponding end surface of the core, and the distance between the movable rod and the injection molded part is shortened in time through the action of accelerating the extending, so that the injection molded part is hung successfully, and the risk that the injection molded part falls off is avoided.
In one example of the present invention, includes: and the air blowing assembly is arranged on the outer surface of the mold core and is provided with a plurality of air blowing ports.
Compared with the prior art, the technical scheme has the following technical effects: the linkage effect of the demoulding assembly is combined, so that the demoulding efficiency is further improved. In combination with the actual demolding condition, on one hand, the abutting end can abut against the injection molding part to enable the injection molding part and the mold core to generate relative movement, so that the injection molding part can be subjected to local force application of the movable rod under the blowing force action of the blowing assembly and then converted into integral force application combined with the blowing assembly, the probability of the injection molding part remaining on the mold is reduced, and the demolding efficiency is further accelerated; on the other hand, because the thrust effect of drawing of patterns subassembly has earlier passed through, avoided with the risk that the injection molding blows off, specifically, to the in-process that the blowing power was applyed to the injection molding, the movable rod stretches out correspondingly the spout to ensure the injection molding hangs all the time and establishes on the core, reduced the degree of difficulty of acquireing the injection molding.
In one example of the present invention, the method further comprises: the driving piece is arranged in the mold core and is used for driving and connecting the movable rod; the driving pieces can drive the corresponding movable rods to perform telescopic motion in the corresponding sliding grooves.
Compared with the prior art, the technical scheme has the following technical effects: through the driving piece is used for controlling and connecting the moving part, the movable rod can be correspondingly flexibly stretched in the sliding groove by adjusting, and accordingly the demolding efficiency is improved.
In one embodiment of the invention, d ≦ 2 mm; when the movable rod part extends out of the sliding groove, the maximum length of the movable rod part extending out of the sliding groove is b, and b is larger than or equal to 3 cm.
Compared with the prior art, the technical scheme has the following technical effects: according to the actual demolding situation, when the distance between the abutting end and the corresponding first opening is greater than 2mm, although the structural strength of the injection molded part is enhanced to a certain extent, the effect on the successful demolding efficiency is not great, so that the distance between the abutting end and the first opening is increased, the cost is only increased in the overall view, and in addition, the reinforcing structure is formed to be too long, so that the bending damage is easily caused under the action of the abutting end in the demolding process; in addition, in order to avoid that the injection molding part falls off from the mold due to overlarge blowing force under the action of the blowing assembly, the length of the movable rod extending out of the mold core can be increased so as to avoid the accidents.
In one example of the invention, the core comprises a plurality of raised structures, at least one side of the raised structures being provided with draft angles; the number of the sliding grooves is multiple, and the sliding grooves are arranged on the side face and/or the inner portion of the protruding structure.
Compared with the prior art, the technical scheme has the following technical effects: specifically, the extending direction of the sliding groove is consistent with the demolding direction of the injection molding part, so that the blockage of the demolding process of the injection molding part is avoided.
In one example of the present invention, the number of the plurality of sliding grooves is an even number, wherein at least one pair of the sliding grooves is diagonally provided to the plurality of projection structures.
Compared with the prior art, the technical scheme has the following technical effects: the movable rods and the sliding grooves are arranged in a one-to-one corresponding sliding mode, and further the movable rods and the sliding grooves can be arranged in a diagonal distribution mode, so that in the demolding process, a plurality of movable parts can flexibly abut against the injection molding part, the injection molding part can move on the mold core in a vertical state, the injection mold is prevented from inclining on the mold core due to uneven stress, the injection mold is extruded with one side of the mold core, and the structure damage of the injection mold is caused.
In one embodiment of the invention, a sealing flexible member is provided at the abutting end; wherein the sealing flexible member is in a compressed state when in the chute.
Compared with the prior art, the technical scheme has the following technical effects: because the movable piece and the sliding groove are movably connected, a fit clearance is easily formed between the movable piece and the sliding groove, and in the injection molding process, injection molding solution is easily made to enter the fit clearance and block the fit clearance, so that the telescopic motion of the movable rod is blocked. Therefore, in the technical scheme, the sealing flexible piece is extruded and deformed to fill the sliding groove at the corresponding position corresponding to the abutting end, so that the injection molding solution is prevented from entering the matching gap. The movable rod can be smoothly stretched and contracted in the subsequent propping process.
In another aspect, the present invention provides an injection moulded part for plastics processing, comprising a mould arrangement as described in any of the above examples.
Compared with the prior art, the technical scheme has the following technical effects: the technical effects described in any of the above technical solutions can be achieved, and are not described herein again.
In yet another aspect, the present invention provides a method of demolding, comprising the mold apparatus of any one of the above examples, or the injection molding machine of the above example; the demolding method comprises the following steps: s10: adjusting the movable rod to completely enter the corresponding sliding groove, wherein the abutting end of the movable rod and the corresponding first opening keep a first injection molding distance; wherein the first injection molding distance is m, and m is more than 0 and less than or equal to d; s20 aligning the dieCarrying out injection molding by using a device to obtain an injection molding piece; the injection molding part forms a reinforcing structure corresponding to the sliding groove; s30: opening the first mold and the second mold, and moving the movable rod towards the direction close to the injection molding piece by a first preset distance through adjusting; wherein the first preset distance is h1(ii) a S40: controlling the air blowing assembly to blow air towards the injection molding piece, and adjusting the movable rod to move continuously to enable the abutting end and the reinforcing structure to keep a second preset distance all the time; wherein the second preset distance is h2(ii) a Controlling a manipulator to obtain the injection molding piece; wherein the distance between the end surface of the core and the bottom surface of the core is marked as H,
，
，
is a drawing bevel corresponding to the drawing gradient of the core, and is more than or equal to 0 degree
≤90°。
Compared with the prior art, the technical scheme has the following technical effects: the injection molding piece can be stably arranged on the mold core before being grabbed by the manipulator, so that the injection molding piece is prevented from falling; in addition, the air blowing assembly and the demolding assembly are controlled in a combined mode, so that the injection molded part can be subjected to demolding efficiently.
In one example of the present invention, the controlling the robot to obtain the injection molded part comprises: s51: controlling the manipulator to move to the corresponding side of the injection molding part, and controlling the movable rod to stop moving; s52: and controlling the manipulator to hold the injection molding piece through a plurality of suckers and return the injection molding piece to the injection molding piece collecting area.
Compared with the prior art, the technical scheme has the following technical effects: the demolding time is saved, and the demolding efficiency is further improved.
After the technical scheme of the invention is adopted, the following technical effects can be achieved:
(1) in combination with the actual injection molding situation, on one hand, the movable rod is controlled to completely enter the sliding groove before injection molding, and the abutting end and the corresponding first opening form a distance, so that a reinforcing structure is formed between the abutting end and the first opening in the injection molding process to reinforce the structural strength of the injection molded part. Therefore, when demoulding is carried out, the abutting end can abut against the reinforcing structure, so that demoulding of the injection molding piece is successfully completed, and the overall production efficiency is improved; on the other hand, the distance between the abutting end and the first opening can be adjusted according to the actual injection molding requirement to form a reinforcing structure with a corresponding length, so that the difficulty in adjusting the strength of the movable rod is further reduced to a certain extent, and the bearing capacity of the injection molded part in the demolding process can be enhanced; in addition, more specifically, in the demolding process, a common demolding means can be combined with a blowing assembly to assist demolding, when the blowing of the blowing assembly is too large, the injection molded part is separated from the surface of the core in a short time, so that the injection molded part falls off, but in combination with the technical scheme, the movable rod can be controlled to extend out of the corresponding end surface of the core, and the distance between the movable rod and the injection molded part is shortened in time through the action of accelerating the extending action so as to successfully hang the injection molded part, so that the risk of falling of the injection molded part is avoided;
(2) the linkage effect of the demoulding assembly is combined, so that the demoulding efficiency is further improved. In combination with the actual demolding condition, on one hand, the abutting end can abut against the injection molding part to enable the injection molding part and the mold core to generate relative movement, so that the injection molding part can be subjected to local force application of the movable rod under the blowing force action of the blowing assembly and then converted into integral force application combined with the blowing assembly, the probability of the injection molding part remaining on the mold is reduced, and the demolding efficiency is further accelerated; on the other hand, due to the thrust action of the demolding component, the risk of blowing off the injection molding piece is avoided, and particularly, in the process of applying blowing force to the injection molding piece, the movable rod extends out of the corresponding sliding groove to ensure that the injection molding piece is always hung on the mold core, so that the difficulty in obtaining the injection molding piece is reduced;
(3) the movable rods and the sliding grooves are arranged in a one-to-one corresponding sliding mode, and further the movable rods and the sliding grooves can be arranged in a diagonal distribution mode, so that in the demolding process, a plurality of movable parts can flexibly abut against the injection molding part, the injection molding part can move on the mold core in a vertical state, the injection mold is prevented from inclining on the mold core due to uneven stress, the injection mold is extruded with one side of the mold core, and the structure damage of the injection mold is caused.
Drawings
Fig. 1 is a schematic structural diagram of a first mold 10 according to an embodiment of the present invention.
Fig. 2 is an enlarged view of a point a in fig. 1.
Fig. 3 is a schematic structural diagram of fig. 1 from another view angle.
Fig. 4 is a sectional view taken in the direction B-B in fig. 3.
Fig. 5 is an enlarged view at C in fig. 4.
Fig. 6 is a schematic structural diagram of an injection molding machine 200 according to a third embodiment of the present invention.
Fig. 7 is a schematic flow chart of a demolding method according to a fourth embodiment of the present invention.
Description of reference numerals:
100-a mold apparatus; 10-a first mould; 20-a core; 21-a raised structure; 22-an outer surface; 30-a stripper assembly; 31-a movable rod; 32-a chute; 33-a first opening; 34-a top-leaning end;
200-injection molding machine.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The first embodiment is as follows:
referring to fig. 1 to fig. 5, a schematic structural diagram of a mold apparatus 100 for plastic molding according to an embodiment of the present invention is shown. The mold apparatus 100 includes, for example, a first mold 10, a second mold, and a demolding assembly 30. Specifically, a core 20 is arranged in the first mold 10; the second mold and the first mold 10 are matched to form an injection molding space, and the injection molding space is used for injection molding of injection molding parts.
Further, a stripper assembly 30 is provided on the outer surface 22 of the core 20, and the stripper assembly 30 includes, for example, at least one runner 32 and at least one movable rod 31. At least one runner 32 is disposed within the core 20 and defines a first opening 33 in the exterior surface 22 of the core 20; at least one movable rod 31 is telescopically arranged in the corresponding sliding groove 32, wherein the movable rod 31 comprises an abutting end 34, and the abutting end 34 is used for abutting against the injection molding piece. When the movable rod 31 is fully inserted into the sliding groove 32, the maximum distance between the abutting end 34 and the corresponding first opening 33 is d, and d is greater than 0.
Specifically, the distance between the abutting end 34 and the corresponding first opening 33 is used for forming a reinforcing structure through injection molding, and the structural strength of the corresponding position of the injection molded part is enhanced. Compared with the prior art, in the prior art, the push rod component is directly acted on the injection molding part, and the injection molding part is still in an incompletely-shaped state, especially a thicker structural part, when being just molded, and if thrust is applied to the structure, the structure at the position is easy to damage. Therefore, in the technical scheme, the pushing force is applied to the reinforcing structure through the movable rod 31, and the injection molding piece is driven to complete the demolding process. The movable rod 31 is prevented from directly acting on the body of the injection molding part to damage the body.
Example two:
referring to fig. 1 to 5, the second embodiment is different from the first embodiment in that a blowing assembly is added to the mold apparatus 100 of the second embodiment, specifically, the blowing assembly is disposed on the outer surface 22 of the core 20, and the blowing assembly has a plurality of blowing openings.
In one embodiment, the efficiency of demolding is enhanced by the cooperation of the blow assembly and the demolding assembly 30. Specifically, in the prior art, in the technical solution for demolding, demolding by using the blowing assembly has occurred, but there are many problems in achieving the demolding effect by using the blowing assembly alone, for example, it is difficult to adjust the blowing force of the blowing assembly according to the different degree of matching between each injection molded part and the mold device 100, and in a processing plant, the injection molded part is often blown off directly from the mold core 20 because the blowing force of the blowing assembly is too large, on one hand, the blown injection molded part cannot be put into the market again, because the surface of the injection molded part is worn during dropping, so that the production efficiency is reduced, and at the same time, a manipulator for collecting the injection molded part does an ineffective action, that is, cannot grab the injection molded part; on the other hand, if the blowing force is too small, the injection molding part is still adhered to the core 20, and therefore, in order to avoid affecting the subsequent injection molding operation, manual processing is required, for example, the injection molding machine is stopped, the injection molding part clamped on the core 20 is disassembled, and the injection molding machine is restarted, so that the next injection molding operation can be performed. More specifically, the injection molded part may not be completely removed by manually removing the injection molded part, so that a part of the structure of the injection molded part remains in the mold device 100, thereby greatly affecting the subsequent injection molding operation and greatly reducing the production efficiency of the product.
Therefore, in combination with the above, in the present technical solution, the abutting end 34 may be used to push the corresponding reinforcing structure, and after the preset distance is reached, the air blowing assembly blows air to the injection molded part, so as to further improve the demolding efficiency, and in order to prevent the injection molded part from dropping under the action of the air blowing, the movable rod 31 may be in a stable extended state all the time, so that the injection molded part may be kept in contact with the movable rod 31 all the time.
Preferably, the mold apparatus 100 includes, for example, a driving member provided inside the core 20 to drive the connecting movable rod 31. Wherein the driving member can drive the corresponding movable rod 31 to perform telescopic motion in the corresponding sliding chute 32.
Preferably, when the movable rod 31 completely enters the sliding groove 32, the maximum distance between the abutting end 34 and the corresponding first opening 33 is 2mm, that is, d is less than or equal to 2 mm; when the movable rod 31 partially extends out of the sliding chute 32, the abutting end 34 extends out of the sliding chute 32, and the maximum length of the movable rod 31 extending out of the sliding chute 32 is b, wherein b is more than or equal to 3 cm.
Preferably, the mold core 20 includes a plurality of protruding structures 21, for example, at least one side of the protruding structures 21 is provided with a draft angle, specifically, a plurality of sliding grooves 32 are provided, and the plurality of sliding grooves 32 are provided on the side and/or inside of the protruding structures 21.
In one embodiment, to facilitate demolding, draft angles are provided on each side of the core 20 to facilitate reducing the difficulty of demolding and improving the demolding efficiency. It is then possible to provide the projection 21 with a slide groove 32 on at least one side, and the slide groove 32 is of a semi-open design, and a filling opening is formed in the side for filling the section of the slide groove between the abutment end 34 and the first opening 33, flowing through the side on which the slide groove 32 is provided, and through which filling opening the section of the slide groove is filled. Of course, the movement of the movable rod 31 on the sliding groove 32 can be adjusted according to different actual requirements, so that the abutting end 34 faces to a position close to or far away from the first opening 33.
Specifically, in combination with specific demolding conditions, such as to produce a plastic lunch box, it is common that the side wall of the plastic lunch box is thin, so that before the beginning of injection molding, the movable rod 31 can be controlled by the driving member to completely enter the inside of the corresponding sliding groove 32, at this time, a certain distance is formed between the abutting end 34 and the first opening 33, so that during the subsequent injection molding process, the injection molding solution can fill the sliding groove section between the abutting end 34 and the first opening 33, so that after the injection molding is completed, a reinforcing structure is formed at the corresponding position of the plastic lunch box, on one hand, the reinforcing structure is connected with the bottom surface in the inner cavity of the plastic box, and since the sliding groove 32 on the side surface is designed in a semi-open manner, the reinforcing structure is also connected with the inner side wall of the plastic box, thereby reinforcing the side wall strength of the lunch box to a certain extent, the situation that damage is easy to occur in the demoulding process due to the thin side wall is avoided to a certain extent; in addition, the abutting end 34 can abut against the reinforcing structure to enable the plastic product of the meal box to be demolded along the side of the core 20 in the direction away from the first mold 10. The bearing capacity of the meal box can be enhanced in practical application, for example, when meal is placed in the plastic part of the meal box. Specifically, during the injection process, the injection solution contacts the outer surface 22 of the core 20, i.e., the injection solution contacts the side surface having the slide groove 32, so as to improve the efficiency of releasing the plastic components of the lunch box.
More specifically, in order to avoid the obstruction to the demolding of the plastic parts of the cutlery box, on one hand, the movable rod 31 may be a long rod, and correspondingly, the sliding groove 32 may be an arc groove structure which is cooperatively connected with the long rod, and considering that the side wall of the injection-molded cutlery box is thin, it is necessary to ensure that the height of the long rod corresponding to the filling opening is lower than or equal to the height of the other position on the side surface when the long rod is disposed in the arc groove structure, and it can be understood that when the long rod is cooperatively connected to the arc groove structure, if the part corresponding to the filling opening protrudes from the side surface, the solution passage formed between the mold core 20 and the mold cavity corresponding to the second mold is further reduced, in other words, the distance between the mold core 20 and the corresponding mold cavity is reduced, thereby reducing the injection molding solution flowing through the position, further reducing the side wall of the tableware plastic part and reducing the structural strength of the tableware plastic part.
Further, combine the actual drawing of patterns condition, in order to make the long member of circular arc post is right the injection molding effectively leans on, for example can all respectively be equipped with at least one in the last side of core 20 and downside respectively the long member of circular arc post to in step simultaneously to the injection molding pushes away, avoids at single movable rod 31 to the in-process that the injection molding pushed away, because of injection molding unilateral atress, and probably make the opposite side of injection molding pastes the corresponding surface of core 20, and the two extrudees each other, thereby to the injection molding causes the damage. Of course, the arc column long rod may be provided on other side surfaces of the core 20, and will not be described herein.
Preferably, the extending direction of the arc-shaped groove structure is consistent with the demolding direction of the injection molding part, so that the demolding difficulty is further reduced.
Of course, the sliding groove 32 may also be disposed inside the protruding structure 21, so as to form the first opening 33 on the end surface of the protruding structure 21 close to the second mold, and likewise, the extending direction of the sliding groove 32 is consistent with the demolding direction of the injection molded part, so as to achieve the effect of reducing the demolding difficulty. In the technical scheme, the reinforcing structure is arranged on the bottom surface of the tableware plastic part, so that the structural strength of the tableware plastic part is enhanced.
In addition, the number of the sliding grooves 32 may be an even number, wherein at least one pair of the sliding grooves 32 is diagonally disposed on the plurality of protrusion structures 21. Each sliding slot 32 may be disposed on a side of each protruding structure 21, or may be disposed inside each protruding structure 21.
Preferably, the mold apparatus 100 further includes a sealing flexure, for example, disposed on the abutting end 34. Wherein, when the sealing flexible piece is in the chute 32 along with the telescopic motion of the movable rod 31, the sealing flexible piece is in a squeezed state.
In one embodiment, in conjunction with the injection molding process, the injection molding solution enters the runner 32 through the first opening 33 to form the reinforcing structure. Because the movable rod 31 is located in the spout 32 for swing joint's mode, so can have the fit clearance between the two, make it can fill to mould plastics solution the fit clearance influences the concertina movement of movable rod 31, works as it is in the cooling and solidifies the state when the solution of moulding plastics, then can fix movable rod 31, makes it carries out concertina movement to driving piece uncontrollable it, even the solution of moulding plastics can with the driving piece contacts, causes the influence to its normal work. Then, by arranging a sealing flexible member on the abutting end 34, the injection molding solution is blocked from entering the fit clearance, so as to ensure that the movable rod 31 can normally move.
For example, the sealing flexible member is a high temperature-resistant flexible member, specifically, the high temperature-resistant flexible member completely wraps the abutting end 34, so that the high temperature-resistant flexible member has a circular structure, the diameter of the high temperature-resistant flexible member is larger than the area of any cross section in the opposite sliding chute 32, and then, the high temperature-resistant flexible member is deformed to fill the notch where the high temperature-resistant flexible member is located through the telescopic motion of the movable rod 31 in the sliding chute 32, so that the injection molding solution is prevented from continuously flowing into the deep part of the sliding chute 32.
Example three:
referring to fig. 6, a schematic structural diagram of an injection molding machine 200 for plastic processing according to a third embodiment of the present invention is shown. The injection molding machine 200 includes, for example, the mold apparatus 100 as described in the first embodiment and/or includes the same as described in the second embodiment.
Example four:
referring to fig. 7, it is a schematic flow chart of a demolding method according to a fourth embodiment of the present invention. The demolding method includes, for example, the mold apparatus 100 according to any one of the above embodiments, or the injection molding machine 200.
In particular, with reference to fig. 1 to 6, the demolding method includes, for example:
step S10: the adjusting movable rod 31 completely enters the corresponding sliding groove 32, and the abutting end 34 keeps a first injection distance with the corresponding first opening 33; wherein the first injection molding distance is m, and m is more than 0 and less than or equal to d;
step S20: performing injection molding on the mold device 100 to obtain an injection molded part; wherein, the injection molding part forms a reinforcing structure corresponding to the position of the sliding groove 32;
step S30: opening the first mold 10 and the second mold, and moving the first mold and the second mold towards the direction close to the injection molded part by adjusting the movable rod 31 for a first preset distance; wherein the first preset distance is h1；
Step S40: controlling the air blowing assembly to blow air towards the injection molding piece, and adjusting the movable rod 31 to move continuously to enable the abutting end 34 and the reinforcing structure to keep a second preset distance all the time; wherein the second preset distance is h2；
Step S50: controlling a manipulator to obtain the injection molding piece;
wherein the distance between the end face of the core 20 and the bottom face thereof is denoted as H,
，
a draft angle corresponding to the draft angle of the core 20 is not less than 0 DEG
≤90°。
Analysis is made in conjunction with actual demolding, taking the case where the demolding assembly 30 is provided on the side surface of the core 20, since the core 20 is provided with draft, the cross-sectional area of the core 20 gradually decreases from the bottom surface thereof to the direction toward the end surface. Therefore, under the pushing action of the movable rod 31 and the blowing action of the blowing assembly, the fit clearance between the injection molded part and the core 20 at the corresponding position is larger and larger, so that the injection molded part can easily fall off the core 20 under the combined action of the self gravity, the pushing force of the movable rod 31 and the blowing action when the injection molded part is not completely separated from the core 20. In order to be able to find precisely where the injection-molded part falls off on the core 20, the following reasonable calculation derivation is then made, for example, as shown by the following formula:
，
. In other words, the specific position where the injection molded part will fall can be known more accurately only if the requirements of the two inequalities are met simultaneously.
In particular, for example when the movable bar 31 is moved in the direction h towards said second mould1It can be seen that the abutment end 34 is still in the slide groove 32, and the injection-molded part is now loose from the side of the core 20In cooperation, i.e. the upper side of the core 20 is in contact with the inner wall of the injection-molded part, where h is1The corresponding formula is supported; when the abutment end 34 extends out of the slide groove 32, the injection-molded part is separated from the upper side of the core 20, and the corresponding inner wall of the injection-molded part is supported by the corresponding portion of the movable rod 31.
Similarly, when the distance between the abutting end 34 and the reinforcing structure is greater than the corresponding h in the above formula2At the maximum distance, there are two cases, and at this time, if the injection molding part is still on the upper side surface of the core 20, the injection molding part plays a supporting role through the core 20, and because the injection molding part is in contact with the upper edge of the end surface of the core 20 under the action of the blowing assembly and the self gravity, the injection molding part is in a shaking state and is easy to fall off, so that the driving part needs to timely control the movable rod 31 to extend towards the injection molding part in an accelerated state so as to reduce the distance between the two, namely to reduce h2More specifically, it is necessary that the abutment end 34 projects beyond the first opening 33, so that the injection-molded part is supported by the corresponding position of the movable rod 31; in another case, in which the abutment end 34 is in the position of protruding out of the first opening 33, it is likewise necessary to extend the abutment end 34 in an accelerated manner towards the injection-molded part in order to close the relative distance between them, so as to avoid the injection-molded part falling off the movable rod 31.
The demolding method will be described in detail below with reference to fig. 1 to 7:
in order to ensure that the injection-molded parts can be subjected to an effective demolding treatment. Before injection molding, the first injection molding distance is maintained between the adjusting movable rod 31 and the first opening 33 to generate a corresponding reinforcing structure in a subsequent injection molding process, and the step S20 is proceeded.
Specifically, an injection solution may be injected into an injection port of the mold device 100 to fill the injection space, so that the injection solution partially collects in the chute section corresponding to the first injection distance to form a reinforcing structure, in this process, the injection solution inside the mold device 100 can be shaped as soon as possible under the action of the cooling liquid, and after the cooling time t is continued, an injection molded part is obtained, and the process goes to step S30. Among them, the cooling time t is preferably 5 seconds.
In the injection molding machine 200, the first mold 10 and the second mold are moved horizontally, so that the second mold is controlled by the transmission mechanism of the injection molding machine 200 to move horizontally away from the first mold 10, and the injection molded part is disposed on the core 20, and although the injection molded part is cooled, the injection molded part still has a high temperature, so that the movable rod 31 is adjusted to abut against the injection molded part in a direction close to the injection molded part, so that the abutting end 34 drives the injection molded part to slowly separate from the core 20 by abutting against the reinforcing structure. The pushing speed is prevented from being too high, so that the movable rod 31 penetrates through the reinforcing structure, and the structure of the injection molding part is damaged. The stroke until the movable rod 31 drives the injection molding piece to move is maintained at the first preset distance.
It should be noted that, in order to maximize the overall demolding efficiency, the movable rod 31 may push the injection-molded part and simultaneously control the manipulator of the injection molding machine 200 to perform a clamping action, that is, the two actions may be performed simultaneously, so as to save the time required for the demolding process, and the process goes to the step S40.
Then, controlling the air blowing assembly to blow air towards the injection molding part, specifically, according to the production of different types of injection molding plastic parts, the air blowing strength of the air blowing assembly needs to be adjusted correspondingly, for example, when the facing injection molding part is a small plastic part, the air blowing strength needs to be reduced; conversely, when the injection-molded part is a relatively large plastic part, it can be, for example, a lunch box. The blowing force needs to be increased so that the lunch box can be moved away from the core 20 by the blowing force. Furthermore, in order to ensure that the injection-molded part is prevented from being blown off during the detachment process, the requirement for precise blowing force adjustment is too severe, and the assistance in demolding is not substantially obvious, it is only necessary that the blowing assembly has a coarse function, and precise control with respect to the blowing assembly needs to be achieved by precise instruments, thereby increasing the cost investment.
Thus, to further ensure that the injection molded part does not fall off the mold apparatus 100 before the robot grips, a requirement is placed on the control of the stripper assembly 30. Specifically, in the process of controlling the air outlet assembly to blow air towards the injection molded part, the movable rod 31 is always adjusted to keep a second preset distance between the abutting end 34 and the corresponding reinforcing structure. For example, when the distance between the two is greater than the second preset distance, the sensor disposed on the top end of the injection molding machine 200 senses the distance and feeds back the distance to the driving member, and the driving member controls the movable rod 31 to increase the speed to move toward the injection molding piece so as to reach the second preset distance. It can be understood that the moving of the driving member is sensed by the hall element, and the sensor transmits the moving steps of the injection molding member, so as to convert the moving steps into corresponding signals, and the signals are processed by an internal processor, so as to finally control the driving member to drive the movable rod 31 to perform corresponding actions.
Turning to step S50, the robot moves between the first mold 10 and the second mold near the end of the core 20, and the robot grasps the injection molded part by the suction cups, thereby completing the demolding process.
Of course, in the next demolding process, the movable rod 31 still needs to be retracted into the corresponding sliding groove 32, and the first injection distance is reserved, so as to form the reinforcing structure, and then the above steps S20, S30, S40 and S50 are repeated in sequence, which is not described herein again.
Preferably, the step S50 specifically includes:
step S51, controlling the manipulator to move to the corresponding side of the injection molding part, and controlling the movable rod 31 to stop moving;
and step S52, controlling the manipulator to hold the injection molding piece through a plurality of suckers and returning to the injection molding piece collecting area.
In another embodiment, when the manipulator moves to the end surface position of the corresponding core 20, the blowing assembly blows air so that the injection molding piece moves towards the direction of the manipulator, if a sensor fails or other conditions occur, and the distance between the abutting end 34 of the movable rod 31 and the reinforcing structure is greater than the second preset distance, the driving piece cannot respond in time due to a fault or the like, and at this time, the manipulator can play a role in preventing dropping, and since the manipulator is provided with a plurality of suckers, which are made of flexible materials, when the injection molding piece contacts with the manipulator, the plurality of suckers play a role in buffering, and meanwhile, since the two contact, the distance between the two is reduced, so that the injection molding piece falls within the effective range of suction force of the suckers, so that the suction cup grips the injection molded part.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A demolding method for plastic molding, comprising a mold device for plastic molding, characterized in that the mold device comprises:
the first die is internally provided with a mold core;
the second mold is matched with the first mold to form an injection molding space, and the injection molding space is used for injection molding of an injection molding piece; it is characterized in that;
a stripper assembly disposed at an outer surface of the core, the stripper assembly comprising:
the sliding chute is arranged in the mold core, and a first opening is formed in the outer surface of the mold core;
the at least one movable rod is arranged in the sliding groove in a telescopic mode; the movable rod comprises an abutting end, and the abutting end is used for abutting against the injection molding piece; a sliding groove section is arranged between the abutting end and the first opening, and injection molding solution can be filled in the sliding groove section to form a reinforcing structure;
when the movable rod completely enters the sliding groove, the distance between the abutting end and the corresponding first opening is d, and d is larger than 0; d is less than or equal to 2 mm; when the movable rod part extends out of the sliding groove, the maximum length of the movable rod part extending out of the sliding groove is b, and b is more than or equal to 3 cm;
the blowing assembly is arranged on the outer surface of the mold core and is provided with a plurality of blowing ports;
the demolding method comprises the following steps:
s10: adjusting the movable rod to completely enter the corresponding sliding groove, wherein the abutting end of the movable rod and the corresponding first opening keep a first injection molding distance; wherein the first injection molding distance is m, and m is more than 0 and less than or equal to d;
s20: performing injection molding on the mold device to obtain an injection molded part; the injection molding part forms a reinforcing structure corresponding to the sliding groove;
s30: opening the first mold and the mold core, and moving the movable rod towards the direction close to the injection molding piece by a first preset distance through adjusting; wherein the first preset distance is h 1;
s40: controlling the air blowing assembly to blow air towards the injection molding piece, and adjusting the movable rod to move continuously to enable the abutting end and the reinforcing structure to keep a second preset distance all the time; wherein the second preset distance is h 2;
s50: controlling a manipulator to obtain the injection molding piece;
wherein the distance between the end surface of the core and the bottom surface of the core is marked as H,
，
，
is a drawing bevel corresponding to the drawing gradient of the core, and is more than or equal to 0 degree≤90°。
2. The method of demolding, according to claim 1, further comprising:
the driving piece is arranged in the mold core and used for driving the movable rod;
the driving pieces can drive the corresponding movable rods to perform telescopic motion in the corresponding sliding grooves.
3. The method of demolding, as claimed in claim 1, wherein the core comprises a plurality of raised structures, the raised structures having draft angles on at least one side;
the number of the sliding grooves is multiple, and the sliding grooves are arranged on the side face and/or the inner portion of the protruding structure.
4. The method of demolding according to claim 3, wherein the number of the plurality of slide grooves is an even number, wherein at least one pair of the slide grooves is provided at diagonal lines to the plurality of projecting structures.
5. The method of demolding, as claimed in any one of claims 1-4, comprising:
the sealing flexible piece is arranged at the abutting end;
wherein the sealing flexible member is in a compressed state when in the chute.
6. The method of demolding according to claim 1, wherein said controlling the robot to obtain the injection molded part comprises:
s51: controlling the manipulator to move to the corresponding side of the injection molding part, and controlling the movable rod to stop moving;
s52: and controlling the manipulator to hold the injection molding piece through a plurality of suckers and return the injection molding piece to the injection molding piece collecting area.
7. An injection molding machine for plastic processing, comprising:
the method of demolding as claimed in any one of claims 1 to 6.
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