CN111206459A - Compression molding device and method for molded product - Google Patents

Compression molding device and method for molded product Download PDF

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Publication number
CN111206459A
CN111206459A CN202010020104.4A CN202010020104A CN111206459A CN 111206459 A CN111206459 A CN 111206459A CN 202010020104 A CN202010020104 A CN 202010020104A CN 111206459 A CN111206459 A CN 111206459A
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CN
China
Prior art keywords
die
base
mold
groove
pressing
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Granted
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CN202010020104.4A
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Chinese (zh)
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CN111206459B (en
Inventor
赵伟
赵署政
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Guangxi Forspai Environmental Protection Technology Co Ltd
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Guangxi Forspai Environmental Protection Technology Co Ltd
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Priority to CN202010020104.4A priority Critical patent/CN111206459B/en
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21JFIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J5/00Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds

Abstract

The invention relates to a compression molding device and a molding method of a molded product, wherein an upper die comprises an upper die base and an upper die cover plate; a lower die base; the upper die further comprises a pressing structure which is used for connecting the upper die base and the upper die cover plate and can move relative to the lower die base in the axial direction when being pressed, when the upper die is moved to enable the upper die cover plate to be in contact with the lower die base, the pressing structure and the lower die base are provided with a pair of spacing surfaces which are opposite to each other and can form close contact through relative movement, one of the opposite spacing surfaces is provided with a pressing groove which is concave towards the axial direction of the lower die base, the other surface of the opposite spacing surfaces is provided with a bulge which is convex towards the axial direction of the lower die base, when enough axial pressure is applied to the upper die base, the pressing structure is pressed to move close to the axial direction of the lower die base, and the lower die base is in close contact with the opposite spacing surfaces of the pressing. The invention can form a complete circle of inverted grooves on the side wall of a molded product.

Description

Compression molding device and method for molded product
Technical Field
The invention relates to the technical field of molding processing, in particular to a compression molding device and a compression molding method for a molded product.
Background
The paper pulp molding product takes paper pulp as a raw material, pulp is sucked and compression molded by a molding die, and a finished product can be recycled and remanufactured, so the paper pulp molding product meets the trend of energy saving and carbon reduction of environmental protection recycling, and the paper pulp molding product is rapidly valued by the industry and the general public and is willing to be accepted and adopted. The paper pulp molded product is widely applied to various fields of life, wherein the paper pulp molded product is commonly used for making cup cover products such as beverage cup covers, coffee cup covers and the like. At present, a pulp molding automatic machine for producing paper and plastic products generally consists of a pulp box, a moving device, a material receiving frame, a hot-pressing upper die device with vacuum adsorption, a forming die upper die device and a frame. However, as a cup lid product, an inverted groove capable of being buckled on a cup needs to be pressed on the side wall of the cup lid product so as to fasten the cup, and the existing device or method can only press a plurality of sections of the inverted groove on the side wall of the cup lid, or the lower die of the cup lid has a pressing groove, but the upper side wall corresponding to the upper die is smooth, and only one shallow groove is formed in the side wall of the cup lid, so that the purpose of fastening the cup cannot be achieved.
Disclosure of Invention
The invention aims to provide a molded product press forming device which can press and form paper pulp into a required cup cover and form a circle of complete inverted groove on the side wall of the cup cover so as to achieve the purpose of fastening a cup.
The scheme adopted by the invention for solving the technical problems is as follows:
a molded product press forming apparatus comprising:
the upper die comprises an upper die base and an upper die cover plate which is arranged on one side of the upper die base and has a distance with the upper die base;
the lower die comprises a lower die base arranged on one side of the upper die cover plate, which is far away from the upper die base;
the upper die further comprises a pressing structure which is used for connecting the upper die base and the upper die cover plate and can move relatively to the axis direction of the lower die base when being pressed, when the upper die is moved to enable the upper die cover plate to be contacted with the lower die base, the pressing structure and the lower die base are provided with a pair of opposite spacing surfaces which can form close contact through relative movement, one of the opposite spacing surfaces is provided with a pressing groove which is sunken to the axis direction of the lower die base, the other surface of the opposite spacing surfaces is provided with a bulge which is protruded to the axis direction of the lower die base and matched with the pressing groove in shape, when enough axial pressure is applied to the upper die base, the upper die base presses the pressing structure and the upper die cover plate on the lower die base, and in the process, the pressing structure is pressed to move close to the axis direction of the lower die base, the lower die base is in close contact with opposed spaced surfaces on the hold-down structure to hold the projections in the press grooves.
As a preferred technical solution of the present invention, the pressing structure includes an inclined guide post connected to an upper die base, an upper die moving core slidably connected to the inclined guide post, and an upper die slide block which is limited between the upper die moving core and the upper die cover plate and can move toward an axial direction of the lower die base when being pushed, wherein the inclined guide post is connected to the upper die slide block in an abutting manner when being pressed, and a gap is formed between a side surface of the upper die base facing the lower die base and a side surface of the upper die moving core facing away from the lower die base in an initial state;
the pair of opposite spaced surfaces are an outer circumferential surface of the lower die base and an inner circumferential surface of the upper die sliding block, which is opposite to the outer circumferential surface of the lower die base, the outer circumferential surface of the lower die base is provided with the pressing groove, and the inner side wall of the upper die sliding block is provided with the protrusion;
when enough axial pressure is applied to the upper die base, the upper die base drives the inclined guide post to slide on the upper moving core close to the upper die cover plate, and the inclined guide post pushes the upper die sliding block to move towards the axis direction of the lower die base in the sliding process so that the inner circumferential surface of the upper die sliding block is pressed on the outer circumferential surface of the lower die base in a propping mode, and then the protrusions are pressed in the pressing grooves.
Furthermore, the inclined guide post comprises a sliding connection part which inclines towards the axis direction of the lower die base and a fixed block which is connected with the sliding connection part, the fixed block is fixedly connected with the upper die base, an insertion groove which is matched with the sliding connection part is arranged on the circumferential side wall of the upper die moving core, and the sliding connection part is in sliding connection in the insertion groove.
Furthermore, a sliding groove matched with the sliding part is formed in the circumferential side wall of the upper die sliding block, in an initial state, the sliding part on the inclined guide post is in sliding connection with the insertion groove in the upper die moving core, one side, far away from the upper die base, of the sliding part on the upper die sliding block extends out of the insertion groove and is arranged in the sliding groove of the upper die sliding block in a sliding mode, and in the initial state, a distance is formed between the inclined guide post and the upper die cover plate.
Further, the side face, deviating from the fixed block, of the sliding connection portion is a first inclined face inclining towards the axis direction of the lower die base, the side wall, opposite to the first inclined face, of the sliding groove is a second inclined face matched with the first inclined face in shape, and in an initial state, one side, far away from the upper die base, of the first inclined face is connected with the second inclined face, far away from the upper die base, of the upper die sliding block in an abutting mode.
Further, the side of the sliding connection part, which deviates from the fixed block, is a first inclined surface which inclines towards the axis direction of the lower die base, the side wall of the sliding groove, which is opposite to the first inclined surface, is an arc surface which is matched with the first inclined surface in shape, and in an initial state, one side, which is far away from the upper die base, of the first inclined surface is connected with the arc surface on the upper die sliding block in an abutting mode.
Further be provided with mutually independent polylith on the upper die cover plate go up the mould slider and polylith under initial condition go up the mould slider and do not contact each other, promote the polylith go up the mould slider to lower mould base axis direction removes extreme position, polylith go up the mould slider contact connection in proper order and polylith go up the inside wall of mould slider connect form with indent perisporium shape complex protruding.
Further, go up the mould base with it passes through the elastic component to be connected to go up the mould core, the elastic component produces deformation when the pressurized, go up and be provided with the recess on the mould core, the one end of elastic component with it is connected to go up the mould base, the other end setting of elastic component is in the recess, it is right go up the mould base and apply sufficient axial pressure, thereby the elastic component pressurized shrinkage holds thereby make in the recess go up the mould base and compress tightly on the mould core.
Furthermore, a clamping groove is formed in the upper die sliding block, a clamping block clamped in the clamping groove is arranged on the upper die cover plate, a fastening bolt extending towards the upper die moving core is fixed on the clamping block, correspondingly, a fixing hole used for containing the fastening bolt is formed in the upper die moving core, a longitudinal guide pillar is further arranged in the fixing hole, and one end of the longitudinal guide pillar extends into the fixing hole from one end of the fixing hole, which is far away from the upper die cover plate, so as to be connected with the fastening bolt through threads.
Further, the longitudinal guide pillar comprises a longitudinal cylinder arranged in the fixing hole and connected with the fastening bolt through threads and a transverse cylinder vertically connected with the longitudinal cylinder and located outside the fixing hole, a containing groove used for containing the transverse cylinder is further formed in the upper die base, and when the transverse cylinder is contained in the containing groove, the upper die base is in contact connection with the upper moving core.
As another preferred embodiment of the present invention, the pressing structure is a pressing pad made of an elastic material, the pressing pad deforms when being pressed, the pair of spaced surfaces facing each other are an outer circumferential surface of the lower mold base and an inner circumferential surface of the pressing pad opposite to the outer circumferential surface of the lower mold base, and the outer circumferential surface of the lower mold base has the pressing groove;
when sufficient axial pressure is applied to the upper die base, the upper die base presses the upper die cover plate on the lower die base through the extrusion pad, in the process, the extrusion pad is pressed to generate radial deformation so as to form the bulge matched with the pressure groove, and the bulge is compacted in the pressure groove.
Further, go up the die cover board including the orientation go up the boss that the die base direction extends and with the boss is connected and is faced the radial extension portion that the die base axis direction extends, go up the die base and have the orientation radial extension portion convex axial bulge and with the outer marginal part that the axial bulge is connected and is formed the stair structure, radial extension portion with the axial bulge passes through the extrusion pad is connected, the boss with the outer marginal part sets up relatively, and under initial condition, the boss with axial interval has between the outer marginal part.
Furthermore, the lower die further comprises a lower die core movably arranged on the lower die base and the surface of the lower die core is matched and connected with the surface of the lower die base, a forming groove is formed in the side, deviating from the upper die base, of the upper die core, the lower die core is exposed out of the surface of the lower die base in the initial state, the shape of the inner wall of the forming groove is matched, the shape of the inner wall of the lower die base is corresponding to the shape of a molded product to be pressed, and the lower die core can move away from the lower die base when being pushed.
Furthermore, the lower die also comprises a lower die core which is movably arranged on the lower die base and the surface of the lower die core is matched and connected with the surface of the lower die base, a pressing groove is arranged on the side surface of the upper die base facing to the lower die base, the shape of the surface of the lower die core exposed out of the lower die base in the initial state is matched with the shape of the inner wall of the pressing groove, the shape of the lower die core exposed out of the lower die base and the shape of the inner wall of the pressing groove are both corresponding to the shape of a molded product to be pressed, and the lower die core can move away from the lower die base.
Furthermore, the lower die base faces the side face of the upper die cover plate, a first limit groove extending axially and a second limit groove connected with the end side of the upper die cover plate are formed in the side face of the lower die base, the radial size of the second limit groove is larger than that of the first limit groove, one end of the lower die moving core penetrates through the first limit groove, extends into the second limit groove and is limited in the second limit groove through the moving core bottom plate, the moving core bottom plate is limited in the second limit groove and can move in a straight line close to or far away from the first limit groove in the second limit groove, and an air hole communicated with the second limit groove is formed in the bottom face of the second limit groove.
Furthermore, a positioning pin is further arranged on the bottom surface of the second limiting groove, a through hole corresponding to the positioning pin is formed in the movable core bottom plate, a guide groove corresponding to the positioning pin is formed in the lower movable core, and the positioning pin penetrates through the through hole and the guide groove to be connected with the movable core bottom plate and the lower movable core.
Further, the lower die further comprises a lower die bottom plate which deviates from the side face of the upper die and is connected with the lower die base, and an air groove connected with the air hole is formed in the lower die bottom plate.
Another object of the present invention is to provide a molding method using the above-mentioned molded product press-molding apparatus, comprising the steps of:
s1: heating the upper die and the lower die to a temperature required by a molding process, placing a wet blank on the lower die, and pushing the upper die to move towards the lower die;
s2: when the upper die cover plate is in contact with the lower die base, the upper die base is continuously pushed to move towards the lower die, when the upper die base presses the pressing structure and the upper die cover plate on the lower die base, the pressing structure is pressed to move close to the axis of the lower die base so that a wet blank is pressed between the lower die base and the pressing structure, and therefore the protrusions on the opposite spacing surfaces press the wet blank in the pressing grooves, and a circle of complete inverted grooves are formed in the side walls of the wet blank, and pressing of the inverted grooves on a molded product is completed.
And further, after the molded product is pressed, ventilating the lower die base, separating the molded product from the lower die base by airflow, stopping ventilating, resetting the molded product under gravity, and finishing the demolding process of the molded product.
Compared with the prior art, the invention has at least the following beneficial effects: the lower die base is provided with a circle of press grooves matched with the inverted grooves in shape, a circle of bulges matched with the press grooves in shape are formed on the pressing structure, sufficient axial pressure is applied to the upper die base, the pressing structure and the upper die cover plate are pressed on the lower die base by the upper die base, in the process, the pressing structure is pressed to move in the direction close to the axis of the lower die base, the lower die base is in close contact with the opposite spaced surfaces on the pressing structure, so that the bulges press wet blanks in the press grooves, and a circle of complete inverted grooves with good pressing degree are formed on the side wall of the formed cup cover.
Drawings
FIG. 1 is a schematic view of a molding apparatus in an initial state according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a pressing structure according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a press-molding structure of a molding apparatus according to example 1 of the present invention;
FIG. 4 is a schematic structural view of a molding apparatus in an initial state according to embodiment 2 of the present invention;
FIG. 5 is a schematic view of a press-molding apparatus according to example 2 of the present invention.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Example 1
The embodiment discloses a compression molding device for molded products, which is shown in figure 1 and comprises an upper die and a lower die which is separated from the upper die. The upper die comprises an upper die base 100 connected with the power device, an upper die cover plate 110 arranged on one side of the upper die base 100 departing from the power device, and a pressing structure connecting the upper die base 100 and the upper die cover plate 110. In this embodiment, the upper mold base 100 includes a square plate 101 having a top surface connected to the cylinder, and a flange portion 102 connected to the square plate 101 and extending toward the upper mold cover 110, the flange portion 102 having a center hole. Of course, the upper mold base 100 may be a plate body with other shapes, and the power device connected thereto may be other power equipment capable of providing axial pressure thereto. The upper mold cover plate 110 is a circular plate with an outer diameter slightly smaller than the inner diameter of the central hole of the flange portion 102, and is connected to the upper mold base 100 through a pressing structure. The lower mold includes a lower mold base 120 located below the upper mold cover plate 110 and matched with the upper mold cover plate 110 in shape, and the upper mold cover plate 110 can be pressed on the lower mold base 120 after being pressed, i.e. the inner circumferential surface of the upper mold cover plate is tightly attached to the outer circumferential surface of the lower mold base 120 at the opposite position and the shapes of the two are matched. In order to press the undercut groove into the molded product, a ring of press grooves 121 corresponding to the undercut groove to be formed is formed on the outer circumferential surface of the lower mold base 120, and the press grooves 121 are recessed toward the axial direction of the lower mold base 120. The indent 121 is located above the upper shroud plate 110.
As shown in fig. 2, the pressing structure includes an inclined guide post 130 fixedly connected to the upper mold base, an upper movable core 140 slidably connected to the inclined guide post 130, and an upper mold slider 150 retained between the upper movable core 140 and the upper mold cover 110. The inclined guide post 130 includes a sliding connection portion 131 inclined toward the axial direction of the upper die base 100, and a fixing block 132 connected to the sliding connection portion 131 and connected to the upper die base 100 by a fastener such as a bolt, and a side surface of the fixing block 132 away from the sliding connection portion 131 abuts against an inner side wall of the central hole of the flange portion 102. The upper moving core 140 is a disk-shaped plate body having a diameter corresponding to the outer diameter of the upper mold cover 110. The axis of the upper mold core 140 coincides with the axis of the lower mold base 120. The upper mold core 140 is disposed below the upper mold base 100 with a space between its top surface and the bottom surface of the upper mold base 100 in an initial state. The upper moving core 140 is provided on the bottom surface thereof with a molding groove having an inner wall shape corresponding to the shape of a molded product to be press-molded. The circumferential side wall of the upper movable core 140 is provided with a slot 141 for accommodating the inclined guide post 130, the slot 141 is provided with an insertion groove matched with the shape of the sliding connection part 131, and the sliding connection part 131 is slidably connected in the insertion groove, so that the inclined guide post 130 can slide up and down on the upper movable core 140 along the insertion groove. In this embodiment, four slots 141 are disposed on the circumferential side wall of the upper moving core 140 at equal intervals, and correspondingly, the pressing structure includes four inclined guide pillars 130, and of course, the number of slots on the upper moving core 140 and the number of inclined guide pillars 130 may be determined according to actual needs. The sliding connection portions 131 on the four inclined guide posts 130 slide in the insertion grooves on the four slots 141 one by one, so that the four inclined guide posts 130 can slide up and down in the corresponding slots 141. In the present embodiment, four upper sliders 150 are also provided between the upper core 140 and the upper cover plate 110, and the four upper sliders 150 are independent of each other and do not contact each other in the initial state. The inner side walls of the four upper die sliders 150 close to the axial direction of the upper die moving core 140 are arc-shaped, the four upper die sliders 150 are pushed to the limit position in the axial direction of the upper die moving core 140, the four upper die sliders 150 are sequentially in contact connection, the inner side walls of the four upper die sliders 150 are connected to form a complete circle, and the side walls of the circle form a protrusion matched with the peripheral wall of the pressure groove 121 in shape. In the initial state, the outer diameter of a circle formed by connecting the outer sidewalls of the four upper die sliders 150 is the same as the outer diameter of the upper die cover plate 110.
In order to enable the upper die slide 150 to automatically reset along with the movement of the inclined guide column 130 after the pressing is completed, a positioning groove for accommodating the inclined guide column 130 is arranged on the upper die slide 150, the positioning groove is provided with a sliding groove matched with the sliding part 131, in an initial state, the sliding part 131 on the inclined guide column 130 is in sliding connection with the insertion groove on the upper die movable core 140, the lower end of the sliding part 131 extends out of the insertion groove and is in sliding connection with the sliding groove of the upper die slide 150, at this time, the lower part of the inclined guide column 130 is matched with the upper part of the positioning groove, and a distance is formed between the bottom surface of the inclined guide column 130 and the top. Thus, after pressing, in the process that the oil cylinder drives the upper mold base 100 to move upwards, the inclined guide post 130 is also forced to slide upwards on the upper mold moving core 140 so as to drive the upper mold slide 150 which is in sliding contact with the inclined guide post to reset, so that the next molded product can be pressed. In order to facilitate that the four inclined guide posts 130 can more effectively push the upper die sliding block 150 to slide towards the axial direction of the upper die moving core 140 when sliding on the upper die moving core 140, the side surface of the sliding connection part 131 of the inclined guide posts 130, which is far away from the fixed block 132, is the first inclined surface 133 inclined towards the axial direction of the upper die moving core 140, the side wall of the sliding chute of the upper die sliding block 150, which is opposite to the first inclined surface 133, is the second inclined surface 151, the second inclined surface 151 is matched with the first inclined surface 133 in shape and is connected with the first inclined surface 133 in an attaching manner, or the side wall of the sliding chute, which. In an initial state, the lower portion of the first inclined plane 133 on the angle guide 130 is in contact with the upper portion of the second inclined plane 151 of the chute, when pressure is applied to the angle guide 130, the angle guide 130 slides downwards on the upper mold core 140, and due to the slope of the second inclined plane 151, the angle guide 130 gradually pushes the upper mold slide 150 in contact with the angle guide to move towards the axial direction of the upper mold core 140 during the downward sliding process, and when the four upper mold slides 150 move to the limit position, the protrusions formed by the surrounding inner circumferential surfaces of the four upper mold slides 150 are compacted in the press grooves 121 on the lower mold base 120.
In order to make the structure of the upper mold more firm, the upper mold base 100 and the upper movable core 140, and the upper movable core 140 and the upper mold cover plate 110 are connected. Specifically, the upper mold base 100 and the upper movable core 140 are connected by an elastic member, which may be a spring or a deformable rubber elastic column. A groove 142 corresponding to the elastic member is provided on the top surface of the upper moving core 140, one end of the elastic member is provided on the upper mold base 100, and the other end of the elastic member is provided on the bottom surface of the groove 142. In a natural extension state, the elastic member keeps a certain distance between the upper mold base 100 and the upper movable core 140; sufficient pressure is applied to the upper die base 100, the elastic member is compressed and received in the groove 142, and the upper die base 100 is pressed against the upper die core 140.
The connection mode between the upper moving core 140 and the upper mold cover plate 110 is as follows: the upper die slide block 150 is further provided with a clamping groove, the upper die cover plate 110 is provided with a clamping block clamped in the clamping groove, in order to enable the connection to be more stable, the thickness of the clamping block is equal to that of the clamping groove, so that the bottom surface of the upper die movable core 140 is in contact connection with the top surface of the clamping block during fixed installation, and in addition, the clamping block is further fixed with a fastening bolt extending towards the upper die movable core 140. Correspondingly, a fixing hole for the fastening bolt to pass through is formed on the upper movable core 140, a longitudinal guide pillar is further disposed in the fixing hole, a bottom end of the longitudinal guide pillar extends into the fixing hole from a top end of the fixing hole to be in threaded connection with the fastening bolt, and a top end of the longitudinal guide pillar extends out of the upper movable core. For better locking the upper moving core 140 to the upper cover plate 110, the longitudinal guide pillar includes a longitudinal pillar 143 disposed in the fixing hole and threadedly coupled to the fastening bolt, and a transverse pillar 144 perpendicularly coupled to the longitudinal pillar 143 and located outside the fixing hole, so that the upper moving core 140 is fixed between the transverse pillar 144 and the upper cover plate 110 when the longitudinal pillar 143 is fastened to the fastening bolt. In order to prevent the upper mold base 100 from being unable to closely contact with the upper movable core 140 when being pressed due to the existence of the lateral cylinder 144, a receiving groove corresponding to the lateral cylinder 144 is further provided on the bottom surface of the upper mold base 100, and the depth of the receiving groove is equivalent to the thickness of the lateral cylinder 144. After the upper mold cover plate 110 contacts the lower mold base 120, when the power device continues to apply axial pressure to the upper mold base 100, the upper mold base 100 moves downward to compress the elastic member and gradually contract the elastic member into the groove of the upper movable core 140, and meanwhile, the transverse cylinder 144 on the longitudinal guide column 143 is also gradually accommodated in the accommodating groove of the upper mold base 100 during the downward movement of the upper mold base 100, so that the upper mold base 100 is pressed against the upper movable core 140.
In the compression molding process of the molded product, the wet blank can be placed on the lower mold, and for the convenience of demolding, the lower mold further comprises a lower movable core 160 movably arranged on the lower mold base 120 and having a surface matched and connected with the surface of the lower mold base 120. The surface of the lower mold core 160 exposed to the lower mold base 120 in the initial state is fitted to the inner wall shape of the molding groove and both correspond to the shape of the molded product to be press-molded. The center of the top surface of the lower mold base 120 is provided with a first axially extending limiting groove 122 and a second limiting groove 123 connected with the lower end of the first limiting groove 122, and the radial dimension of the second limiting groove 123 is greater than that of the first limiting groove 122. The lower end of the upper moving core 140 passes through the first limiting groove 122 and extends into the second limiting groove 123, and is limited in the second limiting groove 123 by the moving core bottom plate 170, and the moving core bottom plate 170 is limited in the second limiting groove 123 and can make a linear motion in the second limiting groove 123 close to or far away from the first limiting groove 122, so as to drive the lower moving core 160 to move up and down on the lower mold base 120. In order to make the lower moving core 160 move more smoothly in the up-and-down movement process, a positioning pin 124 is disposed on the bottom surface of the second limiting groove 123, a through hole corresponding to the positioning pin 124 is disposed on the moving core base plate 170, and a guide groove corresponding to the positioning pin 124 is disposed on the lower moving core 160, and the positioning pin 124 passes through the through hole and the guide groove to be connected with the moving core base plate 170 and the lower moving core 160.
In order to provide power for demolding of the molded product, an air hole 125 communicated with the second limiting groove 123 is further formed in the bottom surface of the second limiting groove 123, and air is introduced into the air hole 125 to jack the movable core base plate 170 and the lower mold core 160 to move upwards. The lower mold further comprises a lower mold bottom plate 180 connected with the bottom surface of the lower mold base 120, an air groove 181 connected with the air hole is arranged on the lower mold bottom plate 180, and the air groove 181 can be connected with an air pump and the like through a pipeline, so that air can be conveniently introduced.
When the molded product is pressed by using the molded product press-forming apparatus of the present embodiment, referring to fig. 3, after the upper mold and the lower mold are heated to a temperature required for the pulp molding process, a wet pulp molded product is placed on the surface where the lower mold core 160 and the lower mold base 120 are connected, and the oil cylinder is actuated to push the upper mold to move downward. During the downward movement of the upper mold, the inner circumferential surface of the upper mold cover plate 110 and the inner wall of the molding groove of the upper movable core 140 are in contact with the wet embryo on the lower movable core 160. Continuing to exert axial pressure to last mould base 100, oblique guide pillar 130 is pressed and is slided downwards on last mould movable core 140 thus promote the last mould slider 150 rather than being connected and move to indent 121 direction, and meanwhile, the elastic component on going up mould base 100 is compressed to contract and is made last mould base 100 get close to last mould movable core 140 gradually, when four last mould sliders 150 received the thrust and moved to extreme position, the inner circumferential surface that four last mould sliders 150 formed compresses tightly the wet embryo in indent 121 on lower mould base 120 to form the complete back-off recess of a circle on the perisporium of wet embryo. At this time, the upper mold base 100 also moves downward to press against the upper mold core 140, and the upper mold core 140 is pressed to press the wet blank against the lower mold core 140 and the lower mold base 120, so as to press and form the wet blank, and thus, the pressing of the wet pulp blank is completed.
After the pulp molding product is pressed, the oil cylinder drives the upper mold base 100 to move upwards, the elastic piece gradually resets to the initial position under the elastic acting force of the elastic piece, and the elastic piece pushes the upper mold moving core 140 to move downwards in the resetting process so that the inclined guide post 130 makes an upward relative movement and further drives the upper mold sliding block 150 in sliding connection with the inclined guide post to reset to the initial position. When the upper die moves to a set position, the air groove 181 is blown, air enters the air hole 125 through the air groove 181, and then the movable core bottom plate 170 in the second limiting groove 123 is jacked up by air flow to drive the lower movable core 160 to move upwards along the vertical direction, the pulp molded product is separated from the lower die base, the blowing is stopped, the lower movable core 160 is reset, the demolding process of the molded product is completed, and the process of the compression molding of the molded product is realized.
Example 2:
unlike embodiment 1, see fig. 4, the compression structure is a compression pad 230 made of an elastic material, and the compression pad 230 is deformed when being compressed; in the present embodiment, the upper mold cover 210 includes a boss 211 extending toward the upper mold base 200, and an annular radial extension 212 connected to the boss 211 and extending toward the axial direction of the lower mold base 220. When the upper mold cover plate is pushed to press against the lower mold base, the inner sidewall of the radial extension 212 is in close contact with the corresponding outer circumferential wall of the lower mold base 220, and the contact surface shapes of the two are matched. The bottom surface of the upper die base 200 is provided with an axial convex part 201 protruding towards the radial extension part 212 and an outer edge part 202 connected with the axial convex part 201 to form a step structure, and the boss 211 on the upper die cover plate 210 is arranged opposite to the outer edge part 202 on the upper die base 200 and has an axial distance therebetween in an initial state. The upper mold base 200 also has a pressing groove on the bottom surface thereof, the shape of the inner wall of which matches the shape of the surface of the lower mold core 260 exposed to the lower mold base 220 in the initial state and both of which correspond to the shape of the molded product to be press-molded. The pressing pad 230 has a circular ring shape with inner and outer diameter dimensions comparable to those of the radially extending portion 212. The pressing pad 230 is disposed between the radially extending portion 212 and the axial boss 201, and it serves to connect the radially extending portion 212 and the axial boss 201. When the upper mold cover 210 is brought into contact with the lower mold base 220, the inner walls of the pressing grooves of the upper mold base 200 are engaged with the surfaces of the lower mold core 260 protruded from the lower mold base 220, and the pressing grooves 221 of the outer circumferential surface of the lower mold base 220 and the inner circumferential surface of the pressing pads 230 are opposed to each other. When sufficient axial pressure is applied to the upper die base 200, the outer edge part 202 on the upper die base 200 gradually approaches the boss 211, in the process, the axial convex part 201 on the upper die base 200 gradually presses the extrusion pad 230, the extrusion pad 230 generates radial deformation when being pressed to gradually form a convex matched with the press groove 221, and when the outer edge part 202 on the upper die base 200 presses the boss 211, the convex generated when the extrusion pad 230 is pressed is compacted in the press groove 221.
When the molded product press forming device of the embodiment is applied, the upper die and the lower die are heated to the temperature required by the pulp molding process, the wet blank of the molded product is placed on the lower die, and the oil cylinder drives the upper die base to move downwards, as shown in fig. 5. In the downward movement process of the upper mold, the upper mold cover plate 210 firstly contacts with the lower mold base 220, the upper mold base 200 is continuously pushed to move downward, and the upper mold base 200 gradually compresses the wet blank onto the lower mold core 260 and the lower mold base 220, so that a molded product to be molded is pressed on the wet blank. Meanwhile, the outer edge 202 of the upper mold base 200 gradually approaches the boss 211, so that the axial protrusion 201 of the upper mold base 200 continuously presses the pressing pad 230, the pressing pad 230 is radially deformed when pressed to gradually form a protrusion fitting the pressing groove 221, and when the step surface 202 of the upper mold base 200 presses the boss 211, the protrusion presses the wet embryo on the outer circumferential surface of the lower mold base 220 into the pressing groove 221, so that a complete undercut groove is formed on the sidewall of the molded product.
After the pulp molded product is pressed, the oil cylinder drives the upper mold base 200 to move upwards, and the extrusion pad 230 is gradually reset to the initial position. When going up the mould and moving to the settlement position, blow to the gas pocket, during gas enters into gas pocket (not shown in the figure) through the gas pocket to make the lower mould that is arranged in the second spacing groove move up along vertical direction upward movement by air current jack-up and then drive lower mould core 260, so that pulp molding product and lower mould base 220 separation stop ventilating, lower mould core 260 resets, thereby accomplishes the drawing of patterns, has so far realized the process of molding product press forming.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (19)

1. A molded product press forming apparatus, comprising:
the upper die comprises an upper die base and an upper die cover plate which is arranged on one side of the upper die base and has a distance with the upper die base;
the lower die comprises a lower die base arranged on one side of the upper die cover plate, which is far away from the upper die base;
the upper die further comprises a pressing structure which is used for connecting the upper die base and the upper die cover plate and can move relatively to the axis direction of the lower die base when being pressed, when the upper die is moved to enable the upper die cover plate to be contacted with the lower die base, the pressing structure and the lower die base are provided with a pair of opposite spacing surfaces which can form close contact through relative movement, one of the opposite spacing surfaces is provided with a pressing groove which is sunken to the axis direction of the lower die base, the other surface of the opposite spacing surfaces is provided with a bulge which is protruded to the axis direction of the lower die base and matched with the pressing groove in shape, when enough axial pressure is applied to the upper die base, the upper die base presses the pressing structure and the upper die cover plate on the lower die base, and in the process, the pressing structure is pressed to move close to the axis direction of the lower die base, the lower die base is in intimate contact with opposed spaced surfaces on the hold-down structure so that the projections are held down in the indents.
2. The apparatus for press-forming a molded product according to claim 1, wherein the pressing structure comprises an inclined guide post connected to an upper mold base, an upper mold core slidably connected to the inclined guide post, and an upper mold slide retained between the upper mold core and the upper mold cover and movable in a direction close to an axis of the lower mold base when pushed, wherein the inclined guide post is in abutting connection with the upper mold slide when pressed, and wherein a distance is provided between a side of the upper mold base facing the lower mold base and a side of the upper mold core facing away from the lower mold base in an initial state;
the pair of opposite spaced surfaces are an outer circumferential surface of the lower die base and an inner circumferential surface of the upper die sliding block, which is opposite to the outer circumferential surface of the lower die base, the outer circumferential surface of the lower die base is provided with the pressing groove, and the inner side wall of the upper die sliding block is provided with the protrusion;
when enough axial pressure is applied to the upper die base, the upper die base drives the inclined guide post to slide on the upper moving core close to the upper die cover plate, and the inclined guide post pushes the upper die sliding block to move towards the axis direction of the lower die base in the sliding process so that the inner circumferential surface of the upper die sliding block is pressed on the outer circumferential surface of the lower die base in a propping mode, and then the protrusions are pressed in the pressing grooves.
3. The compression molding apparatus for molded products according to claim 2, wherein the inclined guide post includes a sliding portion inclined toward the axis of the lower mold base and a fixing block connected to the sliding portion, the fixing block is further fixedly connected to the upper mold base, an insertion groove engaged with the sliding portion is provided on a circumferential side wall of the upper movable core, and the sliding portion is slidably engaged in the insertion groove.
4. A molded product press-forming apparatus as claimed in claim 3, wherein a slide groove adapted to said sliding portion is provided on a circumferential side wall of said upper die slide, in an initial state, a sliding portion of said oblique guide post is slidably engaged in said insertion groove of said upper die core and a side thereof remote from said upper die base is projected from said insertion groove and slidably disposed in said slide groove of the upper die slide, and in this state, a space is provided between said oblique guide post and said upper die cover.
5. A molded product press-forming apparatus according to claim 4, wherein a side surface of the sliding portion facing away from the fixed block is a first inclined surface inclined toward an axial direction of the lower die base, a side wall of the slide groove opposite to the first inclined surface is a second inclined surface matched with the first inclined surface in shape, and in an initial state, a side of the first inclined surface away from the upper die base is in abutting connection with the second inclined surface on the upper die slider.
6. A molded product press-forming apparatus as claimed in claim 4, wherein a side surface of said sliding portion facing away from said fixed block is a first inclined surface inclined toward an axial direction of said lower die base, a side wall of said slide groove opposite to said first inclined surface is an arc surface in shape fitting with said first inclined surface, and in an initial state, a side of said first inclined surface remote from said upper die base is in abutting connection with said arc surface on said upper die slide.
7. The apparatus for press-forming a molded product according to claim 2, wherein the upper mold cover plate is provided with a plurality of upper mold slides independent of each other, and the plurality of upper mold slides do not contact each other in an initial state, the plurality of upper mold slides are pushed to move to a limit position in the axial direction of the lower mold base, the plurality of upper mold slides are sequentially contacted and connected, and the inner side walls of the plurality of upper mold slides are connected to form the protrusions which are matched with the peripheral wall of the indent in shape.
8. The compression molding apparatus for molded products according to claim 2, wherein the upper mold base is connected to the upper mold core via an elastic member that deforms when pressed, the upper mold core is provided with a groove, one end of the elastic member is connected to the upper mold base, the other end of the elastic member is disposed in the groove, and sufficient axial pressure is applied to the upper mold base, and the elastic member is compressed and received in the groove so that the upper mold base is pressed against the upper mold core.
9. The compression molding apparatus for molded products according to claim 2, wherein a slot is provided on the upper mold slide, a block is provided on the upper mold cover plate, a fastening bolt extending in the direction of the upper mold core is fixed on the block, correspondingly, a fixing hole for receiving the fastening bolt is provided on the upper mold core, a longitudinal guide pillar is further provided in the fixing hole, and one end of the longitudinal guide pillar extends from one end of the fixing hole away from the upper mold cover plate to be connected with the fastening bolt through a thread.
10. The compression molding apparatus for molded products according to claim 9, wherein the longitudinal guide post includes a longitudinal cylinder disposed in the fixing hole and threadedly coupled to the fastening bolt, and a lateral cylinder perpendicularly coupled to the longitudinal cylinder and located outside the fixing hole, and a receiving groove for receiving the lateral cylinder is further provided in the upper mold base, and the upper mold base is in contact connection with the upper movable core when the lateral cylinder is received in the receiving groove.
11. The molded product press-forming apparatus of claim 1, wherein the pressing structure is a pressing pad made of an elastic material, the pressing pad being deformed when pressed, the pair of spaced surfaces opposed to each other being an outer circumferential surface of the lower base and an inner circumferential surface of the pressing pad opposed to the outer circumferential surface of the lower base, the outer circumferential surface of the lower base having the pressing groove thereon;
when sufficient axial pressure is applied to the upper die base, the upper die base presses the upper die cover plate on the lower die base through the extrusion pad, in the process, the extrusion pad is pressed to generate radial deformation so as to form the bulge matched with the pressure groove, and the bulge is compacted in the pressure groove.
12. The compression molding apparatus for molded products according to claim 11, wherein the upper mold cover plate includes a boss extending in a direction toward the upper mold base and a radially extending portion connected to the boss and extending in an axial direction of the lower mold base, the upper mold base has an axially protruding portion protruding toward the radially extending portion and an outer peripheral portion connected to the axially protruding portion to form a stepped structure, the radially extending portion and the axially protruding portion are connected by the pressing pad, the boss is disposed opposite to the outer peripheral portion, and in an initial state, an axial distance is provided between the boss and the outer peripheral portion.
13. The apparatus for press-forming a molded product according to claim 2, wherein the lower mold further comprises a lower mold core movably disposed on the lower mold base and having a surface in mating contact with a surface of the lower mold base, the upper mold core having a forming groove on a side thereof facing away from the upper mold base, the lower mold core in an initial state having a surface exposed to the lower mold base in mating contact with an inner wall of the forming groove and both corresponding to a shape of the molded product to be press-formed, the lower mold core being movable away from the lower mold base when pushed.
14. A molded product press-forming apparatus as claimed in claim 11, wherein said lower mold further comprises a lower mold core movably provided on said lower mold base and having a surface in surface fitting connection with a surface of said lower mold base, said upper mold base having a pressing groove on a side thereof facing said lower mold base, said lower mold core being exposed to a surface of said lower mold base in an initial state and having a shape fitting an inner wall of said pressing groove and both corresponding to a shape of a molded product to be press-formed, said lower mold core being movable away from said lower mold base when pushed.
15. The compression molding apparatus for molded products according to claim 13 or 14, wherein a side surface of the lower mold base facing the upper mold cover plate is provided with a first limiting groove extending in an axial direction and a second limiting groove connected to an end side of the first limiting groove away from the upper mold cover plate, a radial dimension of the second limiting groove is larger than a radial dimension of the first limiting groove, one end of the lower movable core penetrates through the first limiting groove and extends into the second limiting groove and is limited in the second limiting groove by a movable core bottom plate, the movable core bottom plate is limited in the second limiting groove and can perform linear motion in the second limiting groove close to or away from the first limiting groove, and a bottom surface of the second limiting groove is provided with an air hole communicated with the second limiting groove.
16. The compression molding apparatus for molded products according to claim 15, wherein a positioning pin is further provided on a bottom surface of the second limiting groove, a through hole corresponding to the positioning pin is provided on the moving core base plate and a guide groove corresponding to the positioning pin is provided on the lower moving core, and the positioning pin passes through the through hole and the guide groove to be connected with the moving core base plate and the lower moving core.
17. A molded product press-forming apparatus as claimed in claim 15, wherein said lower die further comprises a lower die base plate connected to a side of said lower die base facing away from said upper die cover plate, said lower die base plate being provided with air grooves connected to said air holes.
18. A molding press forming method using the molded product press forming apparatus according to any one of claims 1 to 17, characterized by comprising the steps of:
s1: heating the upper die and the lower die to a temperature required by a molding process, placing a wet blank on the lower die, and pushing the upper die to move towards the lower die;
s2: when the upper die cover plate is in contact with the lower die base, the upper die base is continuously pushed to move towards the lower die, when the upper die base presses the pressing structure and the upper die cover plate on the lower die base, the pressing structure is pressed to move close to the axis of the lower die base so that a wet blank is pressed between the lower die base and the pressing structure, and therefore the protrusions on the opposite spacing surfaces press the wet blank in the pressing grooves, and a circle of complete inverted grooves are formed in the side walls of the wet blank, and pressing of the inverted grooves on a molded product is completed.
19. The method of claim 18, wherein after the molded product is pressed, the lower mold base is vented, the gas flow separates the molded product from the lower mold base, the venting is stopped, and the molded product is returned under gravity to complete the demolding of the molded product.
CN202010020104.4A 2020-01-09 2020-01-09 Compression molding device and method for molded product Active CN111206459B (en)

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