CN109483825B - Multi-specification inner buckle plastic cover injection molding die - Google Patents
Multi-specification inner buckle plastic cover injection molding die Download PDFInfo
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- CN109483825B CN109483825B CN201910037816.4A CN201910037816A CN109483825B CN 109483825 B CN109483825 B CN 109483825B CN 201910037816 A CN201910037816 A CN 201910037816A CN 109483825 B CN109483825 B CN 109483825B
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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
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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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
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- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding die for multi-specification inner buckle plastic caps, and relates to the comprehensive field of die design and mechanical manufacturing. The mold mechanism comprises a movable mold part, a fixed mold part, and all components and corresponding parameters thereof, and is characterized in that a corresponding inclined top is designed for a plastic electric appliance cover with an inner buckle, and after mold separation, secondary separation is carried out by utilizing the inner drawing force of the inclined top in the movement process under the action of a push plate fixing plate; the second characteristic is a multi-cavity arrangement. The injection molding product produced by the technical scheme of the invention has the advantages that the plastic part with the inner buckle can be molded under the condition of ensuring the surface quality, the operation is convenient, the structure is simple, at most four plastic parts can be molded by one-step molding, the production efficiency is greatly improved, and the molded plastic parts have uniform thickness, no surface cracking, stable buckle structure, no obvious cross striations, no cracks and other phenomena.
Description
Technical Field
The invention relates to the design of an injection molding die for multi-specification inner buckle plastic caps, which adopts a three-plate die structure and an inclined ejection pushing mechanism to mold the plastic caps and relates to the comprehensive technology in the fields of die design and machine manufacturing.
Background
The injection molding is that plastic fluid is injected into a mold through a designed molding mold under the pushing of the pressure of an injection machine, and the plastic fluid is separated after being cooled, so that the required plastic product is obtained. For a plastic part with an inner buckle, a common two-plate mold mechanism cannot be normally pushed out, and even if the two-plate mold mechanism with the inner buckle pulled out is designed to be pushed out, the defects of easy material storage, rough surface, molding defects and the like of the buckle part still exist after mold splitting. Therefore, the inclined ejection pushing-out mechanism is designed, and the movable die and the fixed die are separated and then are separated for the second time, so that the buckle structure is smoothly formed, and the problem which needs to be solved in the technical field is solved urgently.
Meanwhile, in the process of mold production, if only one plastic part is removed in one-time demolding, the waste of time, manpower and material resources can be caused for the products produced in large batch, therefore, how to reasonably optimize the production process of the mold, and on the premise of ensuring the production quality of the products, the number of the products which are formed in one-time is increased as high as possible in the one-time forming process, and the method also has great significance for improving the production efficiency of enterprises and the product competitiveness.
Disclosure of Invention
The invention aims at the design scheme of a mould for molding a plurality of molded plastic parts at one time for a plastic part with an inner buckle.
The working process of the die is as follows: the movable mold and the fixed mold are combined, an injection machine injects injection materials into a mold, the movable mold plate and the fixed mold plate are separated after cooling is completed, then the fixed mold plate is not moved, the inclined ejection mechanism of the movable mold plate starts to work, the inclined ejection mechanism has inclination during work due to inclined ejection, the upper ejection plate starts to eject, a molded plastic part is separated from the driven mold plate under the action of the inclined ejection in the ejection process, and the injection machine resets under the action of a reset spring after demolding is completed, so that an injection process is completed.
In order to achieve the aim, the technical scheme of the invention is as follows:
a mould for plastic cap is used to make plastic cap with internal fastener, which is made up by injection moulding of plastics. Including the overall structure, molded component 2 portion. Wherein:
the overall structure of the die is vertically arranged and comprises a fixed die part and a movable die part; the fixed mold part is positioned at the upper part, and the fixed mold part is positioned at the corresponding lower part; during molding, the plastic melt enters the molded parts through a pouring system for cooling and molding;
the molding parts comprise a male die, a female die and a corresponding insert; the molding parts are generally rectangular cubic mechanisms, and the parting surfaces are selected from the lower bottom surfaces of the molded plastic parts; the male die is connected with the male die insert and is responsible for forming the bottom surface part of the motor cover; the female die is connected with the female die insert and is responsible for forming the top surface part of the motor cover; the female die insert and the male die insert are respectively embedded into the corresponding fixed die plate and the corresponding movable die plate in a whole;
the accuracy of the positions of the fixed die part and the movable die part when the fixed die part and the movable die part are separated or combined is determined through the guide pillar and the guide sleeve; the guide sleeve is positioned on the fixed die part, the guide pillar penetrates through the movable die and the fixed die part, and the guide pillar is fixed on the movable die part.
When the mold is opened, the guide post moves towards the right lower part under the guiding action of the guide sleeve, so that the movable mold is separated from the fixed mold, and the mold opening process is completed once; when the die is closed, the opposite is realized;
the fixed die part further comprises a fixed die plate, a concave die insert, a fixed die base plate, a positioning ring, a nozzle sleeve and a guide column sleeve;
the fixed template is in a rectangular cubic structure, a space provided with a die insert is arranged below the fixed template, and the die insert is connected and fixed with the fixed template through 4 screws; two water holes A, B are arranged at the center position of the right side of the fixed template, the two water holes are communicated, a cooling water channel is arranged inside the fixed template along the periphery of the male die insert, the inlet of the cooling water channel is A, and the outlet of the cooling water channel is B;
the guide post sleeves are pressed into through holes arranged at four corners of the fixed die plate in an interference manner, and the fixed die plate is fixed with the fixed die base plate through 6 bolts;
the nozzle sleeve is arranged at the central position above the fixed template;
the fixed die base plate is of a rectangular plate-shaped structure, a countersunk through hole is formed in the center of the fixed die base plate, and the positioning ring is of an annular flange plate structure and is fixedly connected with the fixed die base plate through two screws;
the movable mould part further comprises a movable mould plate, a movable mould base plate, a cushion block, a push rod fixing plate, a push rod supporting plate, a reset spring, a guide post, an inclined ejection mechanism, a guide post and a spring guide post;
the whole movable template is a rectangular cubic mechanism, a male die insert is arranged above the movable template, and the male die insert is fixedly connected with the movable template through 4 screws; two through holes are respectively arranged on the front side and the rear side of the base, the upper surface is a circular through hole, and the lower surface is a sunk through hole and is responsible for installing a return spring; four through holes are arranged around the guide post and are responsible for installing the guide post; 8 inclined through holes are arranged in the inner part of the box body, the cross section of each through hole is rectangular, and the inclination angle is 12 degrees; 16 circular guide post through holes are formed in the center of the guide post;
two water holes C, D are arranged at the center position of the right side of the movable and fixed template, the two water holes are communicated, a cooling water channel is arranged inside the movable and fixed template along the periphery of the male die insert, the inlet of the cooling water channel is C, and the outlet of the cooling water channel is D;
four upright guide posts are respectively arranged on the periphery of the fixed die plate and matched with the guide post sleeves on the movable die plate, and when the die is opened or closed, the guide posts vertically move up and down in the guide post sleeves;
the whole push rod fixing plate is of a rectangular plate-shaped structure; the centers of the left part and the right part are respectively provided with 8 thimble through holes;
the top end of the spring guide post is disc-shaped, and the rest part of the spring guide post is a cylinder; the top end of the movable template is contacted with the push rod fixing plate, and the rest part of the movable template penetrates through the return spring through the push rod fixing plate through hole and enters the movable template spring guide post through hole; the spring guide posts are respectively provided with a return spring;
four sunk through holes are formed in the periphery of the lower surface of the push rod supporting plate; the push rod supporting plate is connected and fixed with the push rod fixing plate through a fixing screw;
the whole cushion block is of a rectangular cubic structure, and three through holes are designed in the height direction of the cushion block;
a rectangular space is formed between the push rod fixing plate and the push rod supporting plate and between the push rod fixing plate and the movable template due to the existence of the cushion blocks, so that the spring can be compressed in the space, and the push rod fixing plate and the fixing plate move upwards together;
the movable mold base plate is of a rectangular plate-shaped structure, and four sunk through holes are arranged at four corners of the lower surface of the movable mold base plate; three bolt holes are respectively designed at two sides of the connection of the cushion block and the bolt;
the cushion block and the movable mold base plate are connected and fixed through bolts at four corners; the movable mold base plate, the cushion block and the movable mold plate are connected and fixed through 6 long-leg bolts;
the main body part of the inclined ejection pushing mechanism consists of an inclined ejection body, an inclined ejection guide rod and an inclined ejection seat, and the body spans four parts of a movable mould plate, a movable mould seat plate, a push rod fixing plate and a push rod supporting plate; the inclined ejecting seat is embedded between the push rod fixing plate structures (the push rod fixing plate and the push rod supporting plate), and the inclined ejecting guide rod is connected with the inclined ejecting seat and the inclined ejecting main body; a pin shaft is arranged between the bottom of the pitched roof and the pitched roof seat, so that the pitched roof can rotate in the pitched roof seat; a certain gap is reserved between the inclined top guide rod and the through hole of the movable template, otherwise, the inclined top guide rod cannot be pushed out normally; a guide sleeve is designed in the through hole, so that the inclined ejection guide rod and the through hole can be fixed;
the top of the inclined top is a rectangular cubic bulge, a groove is formed in the outer surface of the rectangular cube, the groove is responsible for forming the inner buckle part of the plastic part, and after injection materials are injected into the groove, the required inner buckle is formed after the injection materials are cooled and removed;
when the die is pushed out for the second time, the push rod fixing plate and the push rod supporting plate move upwards together and stop after reaching the push-out stroke end point, in the process, 4 oblique ejectors with symmetrical central lines slide up and down in the fixed die plate, the oblique ejectors and the oblique ejector bases move in two directions, one is the sliding of the oblique ejectors and the T-shaped grooves, and the other is the rotation of the oblique ejectors around the pin shaft. Because the inclined top has inclination, an inward force can be generated on the electric appliance cover in the moving process, and the inclined top is separated from the buckle through the force and the movement of the inclined top, so that the inclined top can be successfully separated;
the multi-specification forming plastic electric appliance cover comprises the following parameters: the injection molding multi-specification electric appliance cover has the outer dimension range of (85-90) mmX (87-90) mmX (7-9) mm, two opposite sides of the inner surface are provided with a section of square step, the side length is 2-3mm, the average wall thickness is 2-2.5mm, and the thickest part of the step is 5-7 mm. A rectangular inner cavity with the length of 20cm and the width of 8cm and four small rectangular inner cavities with the length of 9cm and the width of 8cm are arranged in the middle of the electric appliance cover, and the depth of the inner cavities is 2 mm. The plastic electric appliance cover is internally provided with four buckles which are right-angled trapezoidal bodies, the buckles protrude inwards by 2-3mm, the length of the upper surfaces of the buckles is 5-7mm, the length of the lower surfaces of the buckles is 7-9mm, the distance between the lower surfaces of the buckles and the bottom of the electric appliance cover is 3-4mm, and the four buckles are symmetrically arranged; the draft angle is 1.5-2 degrees; the volume of the plastic part is (17-20) cm3, and the injection plastic is ABS;
a preferred technical scheme of the number of the cavities is characterized in that the number of the cavities (2) is comprehensively determined according to an injection amount formula (1) and a mold locking force formula (2)
Where V is the nominal injection volume of the injector, cm 3. V1 volume of single plastic part, cm3, V2 total casting system volume, cm 3; f is the rated mold clamping force of the injection molding machine, KN and P are the average pressure of the plastic melt in the mold cavity, Mpa, A1 is the projection area of the casting system on the parting surface, and cm 2. A2 is the projected area of a single plastic part on the parting plane, cm 2. And obtaining the number of the cavities from 1 to 4 according to a formula.
A preferable technical scheme for determining the parting surface is characterized in that in the design of a mold, a surface with the largest projection area is generally used as the parting surface, and in the invention, the bottom surface of the plastic cap is selected as the parting surface by combining the two factors, considering that the thickness of the parting surface is too large when the top surface of the plastic cap is selected, so that the surface quality of a formed product can be influenced, and the advantages of the parting surface is that the parting surface has the largest cross section and the requirements on a plastic part and the appearance quality are not influenced.
A preferred technical scheme of the size of the formed part is characterized in that the production batch of the preset forming plastic cover is 10 thousands of pieces per year, the design is an integral embedded type, an integral concave-convex die is used as an insert and is directly embedded into a fixing plate, and the integral concave-convex die has the advantages of convenience in processing and convenience in replacement of easily damaged parts. The size design is based on the average shrinkage factor method and the specific size is obtained. According to the method, the radial size of the female die, the depth size of the female die, the radial size of the male die and the height size of the male die are obtained.
A preferred technical scheme for designing a concave-convex die insert is characterized in that a concave die is of an integral inlaid structure, a material is P20, a plastic piece is integrally rectangular or square, and the insert is also of a rectangular insert (convenient to process) and is fixed by a screw. According to the fact that the projection area of the plastic part on the parting surface is combined with the shape of the plastic part, the plastic part is approximately square, the length of the side wall of the female die is 20-50mm, the thickness of the side wall of the female die in the length direction is 37mm, and then the length of the insert is determined to be 37 multiplied by 2+86 which is 160 mm. Similarly, when the thickness of the side wall in the width direction is 28mm, the insert length is 142mm, namely 28 × 2+86 mm. The thickness of the bottom dimension of the die is generally determined by the structure, the molded part is a flat part, the casting system is preferably mainly slender, and the thickness of the bottom is temporarily 28-30 mm. Because the female die and the male die are complementary, the length and width of the male die insert are the same as those of the female die, and the male die insert is also fixed by a P20 material and screws;
a preferred technical scheme that the standard die carrier chooses, characterized by that it belongs to (4) according to GB/T12556-90 small-and-medium-sized die carrier and technical condition of plastic injection mould, the applicable template size B x L is less than 5.60 x 900mm, the selection method of the die carrier is calculated according to the following empirical formula (V);
the projection width W1 of the plastic part on the parting surface must satisfy the following conditions: w2-10mm is not less than W1; fifthly
The projection length L1 of the plastic part on the parting surface must satisfy the following conditions: l2-d-30mm is not more than L1;
in the formula, W2 is the width of the upper ejector plate, L1 is the pitch of the reset lever in the length direction, and d is the diameter of the reset lever.
According to the range of the external dimension of the electric appliance cover of (85-90) mm × (87-90) mm × (7-9) mm, W is more than or equal to 87 according to an empirical formula210mm, assuming a one-die two-cavity design, so W2The method is characterized in that 50mm intervals are reserved on two sides of more than or equal to 97 × 2, 194mm, 100mm, 294 mm, 350mm and d 20mm corresponding to the diameter of a reset rod, L2-20-30 is obtained according to an empirical formula 86, the interval L2 in the length direction of the reset rod is more than or equal to 136, two cavities of a die are arranged, 50mm intervals flow out of the two sides, 130 × 2+100 mm, 372L 400mm is obtained, accordingly, the model selecting Longji large water mouth die frame series B × L is 350mm × 400mm, the model is A1, the thickness of an upper ejection plate is 20mm, when the design method of the four cavities of the die is the same as that of the two cavities, and the size design of a fixed die seat plate, a fixed die plate and a cushion block plate is comprehensively determined according to the selected standard combination die frame integral structure;
the size of each part of the inclined ejection mechanism is (6.5-8) mm of core-pulling distance and (18-22) mm of thickness of the upper ejection plate according to the specification of the plastic piece. Two ends of the inclined top are respectively provided with a groove, the section of the inclined top is rectangular, the side length is 5-7mm, if the angle of the inclined top is too large, on one hand, the bending moment born by the inclined top is too large, on the other hand, the core-pulling distance is increased, the angle is 10-12 degrees, the push-out stroke is 35-40mm, and the total length of the inclined top is 150-165 mm. The cross-sectional dimension of the bump is the same as that of the pitched roof. The length of the inclined top seat is 13-18mm, the width is 13-18mm, the height is 30mm, the width of the T-shaped groove is 8-12mm, and the diameter of the pin shaft groove is 2-4 mm;
a preferred technical scheme of a gating system is characterized in that: the main runner lining material is T10A, and is conical, the cone angle is 5 degrees, and the surface roughness RA is 0.8 μm. The concave spherical radius of the main runner is 6-7mm, the depth is 4-5mm, the diameter of the small segment of the runner is 3.9-4.1mm, the diameter of the large segment is 4.1-4.15mm, and the length of the runner is 67-68 mm. The shape is conical, the cone angle is 5-6 degrees, and the surface roughness RA is 0.8 mu m; the length of the sub-runner is 13-14mm, and the diameter is 8-8.5 mm. Side gates, 1mm long, 3mm wide and 1mm deep. Exhausting gas by adopting gaps among parts;
a preferable technical scheme of the cooling water channel is characterized in that cooling water is adopted for cooling. The cooling time is 9-10 s. The section of the cooling pipeline is circular, and the diameter of the cooling pipeline is 6-6.5 mm. The minimum flow rate is 2.16m/s, the average flow rate is 7.6m/s, and the heat transfer coefficient h is 91044KJ/(m2 Xh × C); the total heat transfer area A is 0.01m2, the total length is 1.65-1.68m, and the number of cooling water holes is 2. The size of the electric appliance cover is small, and the flash gap can meet the exhaust requirement, so that the exhaust is carried out by adopting a gap exhaust mode among parts;
the preferable technical scheme of the guide pillar is characterized in that the type of the guide pillar is a straight guide pillar, the front end of the guide pillar is conical, the half cone angle number a is 12-15 degrees, the guide pillar is in transition fit with the bottom part H7/k6 of a support plate, the sliding part adopts H8/f7 clearance fit, the surface roughness is Ra0.8 mu m, the diameter of the guide pillar is 33-37mm, the length of the guide pillar is 90-100mm, and the material is subjected to T10A surface quenching treatment;
the preferable technical scheme of the guide sleeve is characterized in that the guide sleeve is of a leading type, according to GB6149.2-1984, the material is selected from No. 20 steel for surface quenching treatment, the inside and outside of the section of the guide sleeve and the front end of a guide hole are rounded, and the surface roughness Ra0.8 mu m. The diameter of the inner hole of the guide sleeve with the head is 36-37mm, the diameter of the outer wall is 41-43mm, the diameter of the excircle of the head is 46-48mm, and the wall thickness is 2.8-3.2 mm. The guide post and the guide sleeve are in clearance fit H7/m 6;
the injection molding product produced by adopting the technical scheme of the invention has the advantages that the plastic part containing the inner buckle can be molded under the condition of ensuring the surface quality, the operation is convenient, the structure is simple, at most four plastic parts can be molded by one-step molding, the production efficiency is greatly improved, and the molded plastic parts have uniform thickness, no surface crack, stable buckle structure, no obvious cross grain, no crack and other phenomena;
drawings
FIG. 1 is an exploded view of a multi-specification inner snap plastic cap injection molding mold
FIG. 2 is a perspective view of the mold as a whole
FIG. 3 is a front view of the mold
FIG. 4 is a left side view of the mold
FIG. 5 is a top view of the mold
The reference number in the figure is A01. a positioning ring; A02. a nozzle sleeve; A03. mounting screws; A04. a fixed die base plate; A05. a guide sleeve; A06. fixing a template; A07. a female die insert; B01. a male die insert; B02. a guide post; B03. moving the template; B04. a return spring; B05. a push plate support plate; B06. a screw; B07. pushing the plate to fix the plate; B08. cushion blocks; B09. a movable mould seat plate; B10. a screw; B11. a long leg screw; B12. a thimble; B13. pulling a material rod; B14. a slanted ejecting seat; B15. obliquely ejecting; B16. a spring guide post; C. and (4) forming the plastic cover.
Detailed Description
The following detailed description of the present invention with reference to the drawings is provided to fully and completely describe the technical solutions of the present invention.
A multi-specification inner buckle plastic cover injection molding mold is used for manufacturing a plastic cover which is molded by plastic injection materials and contains inner buckles, and a mold for molding a plurality of plastic parts at one time is needed. Comprises a mould body and a molding part 2. Wherein:
the die body is vertically arranged and comprises a fixed die part A and a movable die part B; the fixed mold part is positioned at the upper part, and the fixed mold part is positioned at the corresponding lower part;
the molding parts comprise a male die insert B01 and a female die insert A07; the molding parts are generally rectangular cubic mechanisms, and the parting surfaces are selected from the lower bottom surfaces of the molded plastic parts; the male die is connected with the male die insert B01 and is responsible for forming the bottom surface part of the motor cover; the female die is connected with the female die insert A07 and is responsible for forming the top surface part of the motor cover; the whole bodies are respectively embedded into a corresponding fixed template A06 and a corresponding movable template B03;
the accuracy of the position of the fixed die part and the movable die part when the fixed die part and the movable die part are separated or combined is determined through a guide post B02 and a guide sleeve A05; the guide sleeve A05 is located on the fixed die part, and the guide post B02 penetrates through the movable die and the fixed die and is fixed on the movable die part.
When the mold is opened, the guide post B02 moves to the right lower side under the guiding action of the guide sleeve A05, so that the movable mold is separated from the fixed mold, and the mold opening process is completed once; when the die is closed, the opposite is realized;
the fixed die part further comprises a positioning ring A01, a nozzle sleeve A02, a mounting screw A03, a fixed die seat plate A04, a guide sleeve A05, a fixed die plate A06, a concave die and a concave die insert A07;
the fixed die plate A06 is of a rectangular cubic structure, a space provided with a die insert A07 is arranged below the fixed die plate A06, and the die insert A07 is fixedly connected with the fixed die plate through 4 screws; two water holes A, B are arranged at the center position of the right side of the fixed die plate and are communicated, a cooling water channel is arranged inside the fixed die plate along the periphery of the male die insert A07, the inlet of the cooling water channel is A, and the outlet of the cooling water channel is B; the purpose of cooling by adopting cooling water is to keep the mold in a certain temperature range, so that the quality of a molded product is ensured;
the guide sleeve A05 is pressed into through holes arranged at four corners of the fixed die plate in an interference manner, and the guide column sleeve A05 is used for reducing friction and enabling the guide column to be smoother when moving up and down; the fixed die plate A06 is fixed with the fixed die seat plate A04 through 6 screws A03; namely, the template fixing screw A03 is used for fixing the template A03 and the fixed die seat plate A04; the nozzle sleeve A02 is arranged at the center position above the fixed die plate; the nozzle sleeve A02 is used for butting the nozzle of the injection molding machine, and the injection material smoothly enters the interior of the mold through the nozzle sleeve;
the fixed die base plate A04 is of a rectangular plate-shaped structure, a countersunk through hole is formed in the center of the fixed die base plate, and is used for placing a positioning ring A01 which is of an annular flange structure and is fixedly connected with the fixed die base plate through two screws; namely, the screw is used for fixing the positioning ring A01 on the fixed die seat plate A04; the fixed die seat plate A04 has the function that the lower part of the fixed die seat plate A04 is embedded with the die insert A07 and is matched with the pressing plate of the injection machine, so that the injection machine can have a stressed object during injection, and the injection process is stable;
the movable mould part further comprises a male mould insert B01, a guide post B02, a movable mould plate B03, a return spring B04, a push rod supporting plate B05, a screw B06, a push rod fixing plate B07, a cushion block B08, a movable mould seat plate B09, a screw B10, a screw B11, a thimble B12, a material pulling rod B13, an inclined ejection mechanism B14 and a B15;
the whole movable die plate B03 is a rectangular cube mechanism, a male die insert B01 is embedded above the movable die plate B03, and the male die insert B01 is fixedly connected with the movable die plate through 4 screws; two through holes are respectively arranged on the front side and the rear side of the base, the upper surface is a circular through hole, the lower surface is a sunk through hole, and the base is responsible for installing a return spring B04; four through holes are arranged around the base plate and are responsible for installing guide posts B02; 8 inclined through holes are formed in the inclined roof, the cross section of each through hole is rectangular, and the inclination angle of each through hole is 12 degrees and used for assembling the inclined roof; the centers of the left part and the right part are respectively provided with 5 circular thimble through holes for assembling thimbles; a through hole is arranged at the gravity center position of the material pulling rod for assembling the material pulling rod B13;
two water holes C, D are formed in the center of the right side of the movable die plate B03 and are communicated, a cooling water channel is formed in the movable die plate B03 along the periphery of the male die insert B01, the inlet of the cooling water channel is C, and the outlet of the cooling water channel is D;
four upright guide posts B02 are respectively arranged on the periphery of the movable die plate B03, the upright guide posts B02 are matched with a guide post sleeve A05 on the fixed die plate A06, and when the die is opened or closed, the guide posts B02 vertically move up and down in the guide post sleeve A05;
the push rod supporting plate B05 is of a rectangular plate-shaped structure as a whole; the centers of the left part and the right part are respectively provided with 8 thimble through holes;
the top end of the return spring B04 corresponding to the guide post is disc-shaped, and the rest part is a cylinder; the top end of the movable template is contacted with the push rod fixing plate, and the rest part of the movable template penetrates through a return spring B04 to a through hole of a spring guide post of the movable template through a through hole of a push rod supporting plate B05; the spring guide posts B16 are respectively provided with a return spring B04; the spring guide post B16 is used for contracting the spring in a specified vertical direction; the return spring B04 is used for returning the die after the secondary pushing is finished;
the cushion block B08 is integrally of a rectangular cubic structure, and three through holes are designed in the height direction of the cushion block B08; the cushion block B08 has the function of forming a rectangular space between the two blocks, and necessary possibility is provided for secondary pushing;
four sunk through holes are formed in the periphery of the lower surface of the push rod supporting plate B05; the push rod supporting plate B05 is fixedly connected with a push rod fixing plate B07 through a fixing screw B06; namely, the push rod fixing plate B07 and the push rod supporting plate B05 are connected into a whole by the fixing screws and can move up and down in the space between the two cushion blocks B08;
a rectangular space is generated between the push rod fixing plate B07 and the push rod supporting plate B05 and the movable die plate B03 due to the existence of the cushion block B08, so that the return spring B04 can be compressed in the space, and the push rod supporting plate B05 moves upwards together with the push rod fixing plate B07;
the movable mold base plate B09 is of a rectangular plate-shaped structure, and four sunk through holes are arranged at four corners of the lower surface of the movable mold base plate B09; three bolt holes are respectively designed at the joint of the cushion block B08; the device is connected and fastened with a cushion block B08 through a screw B10 positioned on a corner;
the cushion block B08 is fixedly connected with the moving die base plate B09 through bolts at four corners; the movable mold base plate B09, the cushion block B04 and the movable mold plate B03 are fixedly connected through 6 long-leg screws B11;
the main body part of the inclined ejection mechanism consists of an inclined ejection body B15 and an inclined ejection seat B14, the inclined ejection body consists of an inclined ejector and a guide rod, and the inclined ejector spans four parts of a movable mould plate B03, a movable mould seat plate B09, a push rod fixing plate B07 and a push rod supporting plate B05; the inclined top seat B14 is embedded between the push rod fixing plate structures (the push rod fixing plate B07 and the push rod supporting plate B05), and the inclined top guide rod is connected with the inclined top seat and the inclined top main body; a pin shaft is arranged between the inclined top bottom B15 and the inclined top seat B14, so that the inclined top B15 can rotate in the inclined top seat B14; a certain gap is reserved between the inclined top guide rod and the through hole of the movable template B03, otherwise, the inclined top guide rod cannot be pushed out normally; a guide sleeve is designed in the through hole, so that the inclined ejection guide rod and the through hole can be fixed;
the top of the inclined top B15 is a rectangular cube protrusion, a groove is formed in the outer surface of the rectangular cube, the groove is responsible for forming the inner buckle part of the plastic part, and after injection materials are injected into the groove, the required inner buckle is formed after the injection materials are cooled and removed;
when the mold is pushed out for the second time, the push rod fixing plate B07 and the push rod supporting plate B05 move upwards together and stop after reaching the push-out stroke end, in the process, the ejector pin B12 pushes the plastic part upwards under the action of the push rod fixing plate B07, meanwhile, 4 center line symmetrical oblique ejectors B15 slide up and down in the fixed B03, the oblique ejector pin B15 and the oblique ejector seat B14 move in two directions, one is the sliding of the oblique ejector pin B15 and the T-shaped groove, and the other is the rotation of the oblique ejector pin around the pin shaft. Because the inclined top has inclination, an inward force can be generated on the electric appliance cover in the moving process, and the electric appliance cover is separated from the plastic molding buckle through the force and the movement of the inclined top, so that the electric appliance cover can be successfully pulled out;
in general, the movable die plate B03 is responsible for a series of perforated carriers of fasteners, cooling water channels, guide posts, inclined top pushing mechanisms and the like; the push rod fixing plate B07 and the push plate supporting plate B05 are responsible for pushing the plastic part out of the male die after the die is separated; the pitched roof pushing-out mechanism enables the pitched roof to be separated from the buckle through internal draft force generated during secondary pushing-out; the guide post B02 is used for the position accuracy when opening and closing the mold; the return spring B04 is responsible for the reset after the plastic piece is separated; the movable die base plate B09 is responsible for providing support for the injection machine and the die body and fastening the parts through screws;
example 1
The corresponding parameter specifications are given with the plastic electric appliance cover C:
(1) referring to fig. 3, the molded plastic part C is characterized by an outer dimension of 87mm x 86mm x 7mm, a square step on two opposite sides of the inner surface, a side length of 2mm, an average wall thickness of 2mm, and a maximum thickness of 5mm at the step. A rectangular inner cavity with the length of 20cm and the width of 8cm and four small rectangular inner cavities with the length of 9cm and the width of 8cm are arranged in the middle of the electric appliance cover, and the depth of the inner cavities is 2 mm. There are four buckles in the inside of electric appliance lid simultaneously, for right angle trapezoidal body, protruding 2mm in the buckle, buckle upper surface length is 5mm, and the lower surface is 7mm, and buckle lower surface is apart from electric appliance lid bottom 3mm, and four buckles are symmetrical arrangement. Calculating the volume of the plastic part to be 18.5cm3 according to UG, and selecting ABS;
(2) selecting an injection machine model ZYK118/SA, and adopting one-mold two-cavity arrangement according to technical parameters thereof in combination with an empirical formula of mold locking force and injection quantity;
(3) selecting the lower bottom surface of the plastic cover as a parting surface according to the maximum projection area principle in combination with the consideration of the surface quality of the molded part; the forming parts adopt an integral inlaid structure, and the material is P20. Is composed of a female die and a male die; the insert is a rectangular insert and is fixed by a screw. The die part insert A07 is 160mm long, 142mm wide and 28mm high, and the size of the insert convex die B01 is the same as that of the die A07; the dimensions of the formed part were calculated to give D1 ═ 86.810 +0.17，D2＝88.110 +0.12H1＝7.130 + 0.06d1＝80.670 -0.12d2＝83.710 -0.12，d3＝8.120 -0.09，d4＝20.170 -0.12，d5＝9.420 -0.09，h1＝7.120 -0.05，h2＝3.240 -0.07，h3＝5.190 -0.06(ii) a D1 is the radial dimension of die on the width direction, D2 is the radial dimension of die on the length direction, H1 is the depth dimension of die, D1 is the radial dimension on the terrace die width direction, D2 is the radial dimension on the terrace die length direction, D3 is the radial dimension of terrace die buckle forming part width, D4 is the radial dimension on the terrace die responsible for forming plastic cover middle rectangular hole length direction, D5 is the radial dimension on the square length direction, mm.
(4) The mold frame type is that the Longji big water mouth mold frame series B is 350mm 400mm by L, the thickness of the fixed mold base plate A04 is 80mm, the fixed mold plate A0665mm and the size of the cushion block C08 is 90 mm. The diameter of the guide post with the head B02 is 35mm, and the length is 110 mm; the diameter of the guide sleeve A05 is 35mm, the material T10A, and the standard die set model CI-3540-A65-B80-C90;
(5) an inclined ejection mechanism is adopted for the inner buckle and comprises an inclined ejector B15 and an inclined ejector seat B14, the core-pulling distance is 6.5mm, and the thickness of a push rod supporting plate B05 is 20 mm; two ends of the pitched roof are respectively provided with a groove, the section of the pitched roof is rectangular, the side length is 5mm, the angle of inclination of the pitched roof is 10 degrees, the pushing stroke is 37mm, and the total length of the pitched roof is 152.5 mm. The section size of the convex block is the same as that of the inclined top; the length of the inclined top seat is 15mm, the width of the inclined top seat is 15mm, the height of the inclined top seat is 30mm, the width of the T-shaped groove is 10mm, and the diameter of the pin shaft groove is 3 mm;
(6) the material of the main runner lining of the pouring system is T10A, the shape is conical, the cone angle is 5 degrees, and the surface roughness RA is 0.8 μm; the concave sphere radius of the main runner is 6mm, the depth is 4mm, the diameter of the small runner segment is 4mm, the diameter of the large runner segment is 4.1mm, and the length of the runner is 67.5 mm. The shape is conical, the cone angle is 5 degrees, and the surface roughness RA is 0.8 mu m; the length of the sub-runner is 13.1mm, and the diameter is 8 mm; a side gate with a length of 1mm, a width of 3mm and a depth of 1 mm; exhausting gas by adopting gaps among parts;
(7) cooling with cooling water; the cooling time is 9.3 s; the cooling pipeline has a circular section and a diameter of 6 mm. The minimum flow rate was 2.16m/s, the average flow rate was 7.6m/s, and the heat transfer coefficient h was 91044KJ/(m2 × h × C). The total heat transfer area a was 0.01m2, the total length was 1.66m, and the number of cooling water holes was 2. The type of the guide post B02 is a straight guide post, the front end of the guide post is conical, the half-cone angle number a is 13 degrees, the guide post B02 is in transition fit with the bottom H7/k6 of the movable die plate B03, the sliding part adopts H8/f7 clearance fit, and the surface roughness is Ra0.8 mu m; the type of the guide sleeve is a guide sleeve with a head, the material is selected from 20 # steel for surface quenching treatment, the inside and the outside of the cross section surface of the guide sleeve and the front end of the guide hole are rounded, and the surface roughness Ra0.8 mu m; the diameter of an inner hole of the guide sleeve A05 with the head is 36mm, the diameter of an outer wall of the guide sleeve A05 with the head is 42mm, the diameter of an outer circle of the head is 47mm, and the wall thickness of the guide sleeve A is 3 mm; the guide post and the guide sleeve are in clearance fit H7/m 6;
(8) and checking the maximum injection quantity, the injection pressure, the mold clamping force, the mold opening stroke and the installation size (the size of a nozzle, the size of a positioning ring, the closing height of a mold and the size of a template) according to an empirical formula to meet the requirements.
The electric appliance cover can be used for other daily fields such as household appliances, vehicle-mounted accessories and the like.
Claims (18)
1. The injection molding die for the multi-specification inner buckle plastic covers is characterized by being used for manufacturing the plastic covers which are molded by plastic injection materials and contain inner buckles, and the die capable of molding a plurality of plastic covers at one time; comprises a mould body and a molding part 2 part; wherein:
the multi-specification inner buckle plastic cover comprises the parameters that the range of the overall dimension of the multi-specification inner buckle plastic cover is 85-90mm × 87-90mm × 7-9mm, a square step is arranged on two opposite sides of the inner surface, the side length is 2-3mm, the average wall thickness is 2-2.5mm, the maximum thickness of the step is 5-7mm, a rectangular inner cavity with the length of 20cm and the width of 8cm and four small rectangular inner cavities with the length of 9cm and the width of 8cm are arranged in the middle of the multi-specification inner buckle plastic cover, the depth of the inner cavity is 2mm, four buckles are arranged inside the multi-specification inner buckle plastic cover and are right-angled trapezoidal bodies, the inner buckle bulges are 2-3mm, the length of the upper surface of each buckle is 5-7mm, the lower surface of each buckle is 7-9mm, the lower surface of each buckle is 3-4mm away from the bottom of the electrical appliance cover, the four buckles are symmetrically arranged, the draft angle of each buckle is 1.5-2 degrees3ABS is selected as the injection plastic; the number of the cavities is 1-4;
the die body structure is vertically arranged and comprises a fixed die part and a movable die part; the fixed mold part is positioned at the upper part, and the movable mold part is positioned at the corresponding lower part; during molding, the plastic melt enters the molded parts through a pouring system for cooling and molding;
the forming parts comprise a punch insert (B01) and a die insert (A07); the whole molded part is of a rectangular cubic structure, and a parting surface is selected from the lower bottom surface of the plastic cover; the male die is connected with the male die insert (B01) and is responsible for molding the bottom surface part of the plastic cover; the female die is connected with a female die insert (A07) and is responsible for molding the top surface part of the plastic cover; the inserts are respectively embedded into a corresponding fixed template (A06) and a corresponding movable template (B03) integrally; the dimensional parameter is that the radial dimension of the concave die is D1-86.810 +0.17，D2＝88.110 +0.12Depth dimension H1-7.130 +0.06The radial dimension d1 of the punch is 80.670 -0.12，d2＝83.710 -0.12，d3＝8.120 -0.09，d4＝20.170 -0.12，d5＝9.420 -0.09Height h1 ═ 7.120 -0.05，h2＝3.240 -0.07，h3＝5.190 -0.06(ii) a D1 is the radial size of the female die in the width direction, D2 is the radial size of the female die in the length direction, H1 is the depth size of the female die, D1 is the radial size of the male die in the width direction, D2 is the radial size of the male die in the length direction, D3 is the radial size of the width of the male die buckle forming part, D4 is the radial size of the male die in the length direction of the middle rectangular inner cavity of the plastic cover formed by the male die, and D5 is the radial size of the small rectangular inner cavity in the length direction, and the unit is mm;
the accuracy of the position of the fixed die part and the movable die part when the fixed die part and the movable die part are separated or combined is determined by a guide post (B02) and a guide sleeve (A05); the guide sleeve (A05) is positioned on the fixed die part, and the guide post (B02) penetrates through the movable die and the fixed die and is fixed on the movable die part;
when the mold is opened, the guide post (B02) moves to the right lower side under the guide effect of the guide sleeve (A05), so that the movable mold is separated from the fixed mold, and the mold opening process is completed once; the opposite is true when the mold is closed.
2. The multi-gauge inner snap plastic cap injection molding mold according to claim 1, further comprising a positioning ring (a01), a nozzle sleeve (a02), a mold plate fixing screw (a03), a fixed mold seat plate (a04), a guide sleeve (a05), a fixed mold plate (a06), a female mold, and a female mold insert (a 07).
3. The multi-specification inner snap plastic cap injection molding mold according to claim 2, wherein the fixed mold plate (a06) has a rectangular cubic structure, a space for installing the die insert (a07) is provided thereunder, the die insert (a07) is connected and fixed with the fixed mold plate (a06) by 4 screws, and the fixed mold plate (a06) is fixed with the fixed mold plate (a04) by 6 mold plate fixing screws (a 03); the nozzle sleeve (A02) is arranged at the central position above the fixed template (A06); the nozzle sleeve (A02) is responsible for butting the nozzle of the injection molding machine so that the injection material smoothly enters the interior of the mold through the nozzle sleeve; two water holes A, B are formed in the center of the right side of the fixed die plate (A06) and are communicated, a cooling water channel is formed in the fixed die plate (A06) along the periphery of the die insert (A07), the inlet of the cooling water channel is the water hole A, and the outlet of the cooling water channel is the water hole AIs a water hole B; the purpose of cooling by adopting cooling water is to keep the mold in a certain temperature range, so that the quality of a molded product is ensured; the cooling water channel is cooled by cooling water; cooling for 9-10 s; the section of the cooling pipeline is circular, and the diameter of the cooling pipeline is 6-6.5 mm; the minimum flow rate is 2.16m/s, the average flow rate is 7.6m/s, and the heat transfer coefficient h is 91044KJ/m2× h × C, total heat transfer area 0.01m2The total length is 1.65-1.68m, and the number of water holes is 2; and exhausting by adopting a mode of exhausting the clearance between the parts.
4. The multi-gauge inner snap plastic cap injection molding mold according to claim 2, wherein the guide bush (a05) is pressed into the through holes provided at the four corners of the stationary platen (a06) by interference, the guide bush (a05) functions to reduce friction and make the guide post smoother when moving up and down; the corresponding specific parameters are as follows: the type of the guide sleeve (A05) is a guide sleeve with a head, the material is selected from No. 20 steel for surface quenching treatment, the inside and outside of the end surface of the guide sleeve (A05) and the front end of a guide hole are rounded, and the surface roughness Ra0.8 mu m; the diameter of an inner hole of the guide sleeve (A05) is 36-37mm, the diameter of an outer wall is 41-43mm, the diameter of an excircle of a head part is 46-48mm, and the wall thickness is 2.8-3.2 mm; the guide post and the guide sleeve (A05) are matched to be in clearance fit with H8/f 7.
5. The multi-specification inner snap plastic cap injection molding mold according to claim 2, wherein the fixed mold base plate (a04) is a rectangular plate-shaped structure, a countersunk through hole is provided at the center for placing the positioning ring (a01), which is a ring-shaped flange structure, and is fastened and connected with the fixed mold base plate (a04) by two screws; namely, the screw is used for fixing the positioning ring (A01) on the fixed die seat plate (A04); the fixed die seat plate (A04) has the effect that a die insert (A07) is embedded below the fixed die seat plate and is matched with the pressing plate of the injection machine, so that the injection machine can have a stressed object during injection, and the injection process is stable.
6. The multi-specification inner snap plastic cap injection molding mold according to claim 1, further comprising a male mold insert (B01), a guide post (B02), a movable mold plate (B03), a return spring (B04), a push rod support plate (B05), a screw (B06), a push rod fixing plate (B07), a cushion block (B08), a movable mold base plate (B09), a screw one (B10), a screw two (B11), a thimble (B12), a material pulling rod (B13), and a lifter pushing mechanism.
7. The multi-specification inner-buckle plastic cap injection molding mold according to claim 6, wherein the movable mold plate (B03) is a rectangular cuboid structure, a male mold insert (B01) is embedded above the movable mold plate, and the male mold insert (B01) is fixedly connected with the movable mold plate through 4 screws; two first through holes are respectively formed in the movable die plates on the front side and the rear side of the male die insert (B01), the upper surface of each first through hole is a circular through hole, and the lower surface of each first through hole is a bottom-sinking through hole and is responsible for mounting a return spring (B04); four second through holes are formed in the movable die plate on the periphery of the male die insert (B01) and are responsible for mounting a guide post (B02); 8 inclined through holes are formed in the male die insert (B01), the cross section of each through hole is rectangular, and the inclination angle of each through hole is 12 degrees and is used for assembling an inclined top; the center of the left part and the center of the right part of the male die insert (B01) are respectively provided with 5 circular thimble through holes for assembling thimbles (B12); and a third through hole is formed in the center of gravity of the male die insert (B01) and is used for assembling the material pulling rod (B13).
8. The multi-gauge inner snap plastic cap injection mold according to claim 7, wherein the guide post (B02) is a straight guide post, the front end of the guide post (B02) is tapered, the half taper angle number a is 13 °, the guide post (B02) is in transition fit with the bottom H7/k6 of the push rod support plate (B05), the sliding part is in clearance fit with H8/f7, the surface roughness is Ra0.8 μm, the diameter of the guide post (B02) is 35mm, the length of the guide post is 95mm, and the material is subjected to surface quenching treatment by T10A.
9. The multi-specification inner snap plastic cap injection molding mold according to claim 6, wherein the movable mold plate (B03) has two water holes C, D at the right center, the two water holes are through, a cooling water channel is provided inside the movable mold plate (B03) along the periphery of the male mold insert (B01), the cooling water channel has an inlet of water hole C and an outlet of water hole D; four guide posts (B02) are respectively arranged on the periphery of the movable die plate (B03), the guide posts (B02) are matched with a guide sleeve (A05) on the fixed die plate (A06), and when the die is opened or closed, the guide posts (B02) vertically move up and down in the guide sleeve (A05).
10. The multi-gauge inner snap plastic cap injection molding mold according to claim 6, wherein the push rod support plate (B05) is a rectangular plate-like structure as a whole; the centers of the left part and the right part are respectively provided with 8 thimble through holes.
11. The multi-gauge inner snap-fit plastic cap injection mold according to claim 7, wherein each spring guide (B16) is fitted with a return spring (B04), the spring guide (B16) is disc-shaped at its top end and cylindrical at the rest; the top end of the movable mould plate is contacted with the push rod fixing plate, and the rest part of the movable mould plate penetrates through a return spring (B04) to a through hole of a spring guide post of the movable mould plate through a through hole of a push rod supporting plate (B05); the spring guide post (B16) is used for enabling the return spring (B04) to contract in a specified vertical direction; the return spring (B04) is used for returning the mould after the secondary ejection is finished.
12. The multi-specification inner snap plastic cap injection molding mold according to claim 6, wherein the cushion block (B08) is a rectangular cubic structure as a whole, and three through holes four are designed in the height direction thereof; the function of the pad block (B08) is to form a rectangular space between the two blocks, so that the necessary possibility is provided for secondary pushing.
13. The multi-specification inner snap plastic cap injection molding mold according to claim 6, wherein four first sunken through holes are respectively formed around the lower surface of the push rod support plate (B05); the push rod supporting plate (B05) is connected and fixed with the push rod fixing plate (B07) through a fixing screw (B06); namely, the push rod fixing plate (B07) and the push rod supporting plate (B05) are connected into a whole by the fixing screw (B06) and can move up and down in the space between the two cushion blocks (B08);
a rectangular space is generated between the push rod fixing plate (B07) and the push rod supporting plate (B05) and the movable die plate (B03) due to the existence of the cushion block (B08), so that the return spring (B04) can be compressed in the space, and the push rod supporting plate (B05) moves upwards together with the push rod fixing plate (B07).
14. The multi-specification inner snap plastic cap injection molding mold according to claim 6, wherein the movable mold base plate (B09) is a rectangular plate-shaped structure, and four through holes II with sunk bottoms are designed at four corners of the lower surface of the movable mold base plate (B09); three bolt holes are respectively designed at the joint of the cushion block (B08); which is connected and fastened with a cushion block (B08) through a screw I (B10) positioned on the corner.
15. The multi-gauge inner snap fit plastic cap injection mold according to claim 6, wherein the spacer (B08) is fixed to the movable mold base plate (B09) by four-corner bolt connection; the movable mold base plate (B09), the cushion block (B08) and the movable mold plate (B03) are connected and fixed through 6 long-leg screws II (B11).
16. The multi-specification inner snap plastic cover injection molding mold according to claim 6, wherein the lifter ejection mechanism is composed of two parts of a lifter body (B15) and a lifter seat (B14), the lifter body (B15) is composed of a lifter and a lifter guide rod, and the lifter guide rod spans four parts of a movable mold plate (B03), a movable mold base plate (B09), a push rod fixing plate (B07) and a push rod support plate (B05); the inclined top seat (B14) is embedded between the push rod fixing plate (B07) and the push rod supporting plate (B05); the inclined top guide rod is connected with the inclined top seat (B14) and the inclined top body (B15); a pin shaft is arranged between the bottom of the pitched roof body (B15) and the pitched roof seat (B14), so that the pitched roof body (B15) can rotate in the pitched roof seat (B14); a certain gap is reserved between the inclined top guide rod and a through hole V of the movable template (B03), otherwise, the inclined top guide rod cannot be pushed out normally; a guide sleeve is arranged in the fifth through hole, so that the inclined ejecting guide rod slides in the fifth through hole; the corresponding parameters are that the core drawing distance is 6.5-8mm, and the thickness of the upper ejection plate is 18-22 mm; two ends of the inclined top are respectively provided with a groove, the section of the inclined top is rectangular, the side length is 5-7mm, the angle of the inclined top is 10-12 degrees, the push-out stroke is 35-40mm, and the total length of the inclined top is 150-165 mm; the top of the pitched roof is provided with a rectangular cubic bulge, and the cross section of the bulge is the same as that of the pitched roof; the length of the inclined top seat (B14) is 13-18mm, the width is 13-18mm, the height is 30mm, the width of the T-shaped groove is 8-12mm, and the diameter of the pin shaft groove is 2-4 mm.
17. The multi-gauge inner snap plastic cap injection mold of claim 16, wherein the rectangular cube protrusion has a groove on its outer surface for molding the inner snap portion of the multi-gauge inner snap plastic cap, and when the injection material is injected into the groove, the inner snap is required for molding after cooling and releasing;
when the die is pushed out for the second time, the push rod fixing plate (B07) and the push rod supporting plate (B05) move upwards together and stop after reaching the push-out stroke end, in the process, the ejector pins (B12) push the plastic cover upwards under the action of the push rod fixing plate (B07), meanwhile, 4 inclined top bodies (B15) with symmetrical central lines slide up and down in the movable die plate (B03), the inclined top body (B15) and the inclined top seat (B14) move in two directions, one is the sliding of the inclined top body (B15) and the T-shaped groove, and the other is the rotation of the inclined top body (B15) around the pin shaft; due to the inclination, an inward force is generated on the plastic cover during the movement process, and the plastic cover is separated from the plastic forming buckle through the force and the movement of the inclined top, so that the plastic cover is successfully pulled out.
18. The multi-gauge inner snap-in plastic cap injection molding mold according to claim 6, wherein the moving platen (B03) is responsible for a series of fasteners, cooling water channels, guide posts, punch carriers of a lifter; the push rod fixing plate (B07) and the push plate supporting plate (B05) are responsible for pushing the plastic cover out of the male die after the die is separated; the inclined top pushing mechanism (B14, B15) separates the inclined top from the buckle by the internal draft force generated during secondary pushing; the guide post (B02) is used for taking charge of the accuracy of the position during mold opening and mold closing; the return spring (B04) is responsible for the return of the separated plastic cover; the moving die base plate (B09) is responsible for providing support for the injection machine and the die body and for fastening the parts by screws.
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| CN104999626A (en) * | 2015-08-25 | 2015-10-28 | 唐山学院 | Injection mold capable of molding toilet seat and cover plate simultaneously |
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