CN216860424U - Molding device - Google Patents

Abstract

The application provides a forming device, including the first forming die and the second forming die of compound die adaptation, first forming die include the first surface and protrusion in the shaping subassembly of first surface, the first guide way that is used for holding and dredging fluid is offered to the first surface, first guide way is including the first section and the first circulation section of encircleing of intercommunication, first encircleing the section and encircleing the shaping subassembly. The second forming die comprises a second surface and a containing groove concavely arranged on the second surface, the second surface corresponds to the first surface, and a forming cavity for forming a product is formed between the containing groove and the forming assembly. Before the first forming die and the second forming die are opened, the oil is discharged through the first guide groove. The application provides a forming device, through setting up first guide way in order to derive fluid, avoid influencing the quality of shaping product, improved the quality of product.

Description

Molding device

Technical Field

The application relates to the technical field of injection molding, in particular to a molding device.

Background

Electronic product housings are often manufactured by injection molding. In the existing injection molding production process, lubricating oil can be smeared on the contact surface of the molding device so as to reduce the abrasion of the molding device during opening and closing and achieve the effects of prolonging the service life and improving the production precision and efficiency.

However, in the current production process, there are the following problems: impurities and foreign matters are easily generated between contact surfaces in the forming device, the impurities and the foreign matters can influence the circulation of lubricating oil and are gathered at the glue injection port, the product cavity and the like, so that abnormal variegated colors appear on the surface of a finished product of the product, and the quality and the qualification rate of the product are reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a molding apparatus to solve the above problems.

The embodiment of the application provides a forming device, including the first forming die and the second forming die of compound die adaptation, first forming die include first surface and protrusion in the shaping subassembly of first surface, first guide way that is used for holding and dredging fluid is offered to the first surface, first guide way is including the first section and the first circulation section of encircleing of intercommunication, first encircleing the section and encircleing shaping subassembly. The second forming die comprises a second surface and a containing groove concavely arranged on the second surface, the second surface corresponds to the first surface, and a forming cavity for forming a product is formed between the containing groove and the forming assembly. Before the first forming die and the second forming die are opened, the oil is discharged through the first guide groove.

So, forming device is through setting up first guide way, and the fluid is dredged in the gathering to realize mediation, the efficiency of discharging impurity and foreign matter in the oil storage tank.

In a possible embodiment, the first surface is further provided with a first oil reservoir which is in cross communication with the first guide groove, and the size of the first oil reservoir is smaller than that of the first guide groove.

So, through setting up the darker first guide way of first oil storage tank to realize the efficiency that impurity and filth move to first guide way automatically.

In a possible embodiment, the first molding die includes a first bottom plate and a first embedding mechanism, the first embedding mechanism includes a first bottom block and the molding assembly, and the first bottom block is embedded in the first bottom plate. The first surface includes an engaged first floor surface and a first sole block surface, the first floor surface being located on the first floor and the first sole block surface being located on the first sole block. The forming assembly protrudes out of the surface of the first bottom block, and the first surrounding section is located on the surface of the first bottom block.

So, through the first shaping module of split, can improve forming device's general usefulness, reduce the cost that the change product brought.

In a possible implementation manner, the forming assembly includes a forming pin and a positioning block connected to the first bottom block, a forming groove is formed in the positioning block, the forming pin is movably disposed in the forming groove, when the first forming mold and the second forming mold are opened, the forming pin is embedded in the forming groove, and the forming pin and the forming groove are connected to each other on a surface facing one side of the second forming mold.

So, through set up separable shaping round pin on the shaping subassembly to shaping subassembly and product bump when avoiding removing the form improves forming device's ease for use.

In a possible embodiment, the second molding die includes a second bottom plate and a second embedding mechanism, the second embedding mechanism is embedded in the second bottom plate, the second surface includes a surface of the second bottom plate facing the first molding die, and the receiving groove is disposed on the second embedding mechanism.

So, through setting up split type second forming die to the realization is changed embedding mechanism according to the product, thereby reduce cost, improve the efficiency of general usefulness.

In a possible implementation manner, the second bottom plate includes a first sub bottom plate and a second sub bottom plate, a second guide groove is disposed on a side of the first sub bottom plate away from the second sub bottom plate, and a third guide groove is disposed on a side of the second sub bottom plate away from the first sub bottom plate. The first guide block is movably arranged in the second guide groove, and the second guide block is movably arranged in the third guide groove.

So, through setting up the direction motion structure to realize first sub-bottom plate and the sub-bottom plate of second along predetermineeing direction die sinking and lock, do not collided when guaranteeing the product die sinking, improve product quality's stability.

In a possible implementation manner, the second forming mold includes clamping blocks, and at least two sets of the clamping blocks are respectively disposed on a side of the first guide block and a side of the second guide block away from the second forming mold, and respectively abut against the first guide block and the second guide block.

So, press from both sides tight piece through setting up to the realization guarantees the movement track of shaping base to the reinforcement of guide block, improves the stability of forming device work.

In a possible implementation manner, the second forming mold further includes a connecting plate, a first sliding groove is formed in the first sub-bottom plate, a second sliding groove is formed in the second sub-bottom plate, the first sliding groove and the second sliding groove are arranged oppositely, and the connecting plate is movably arranged in the first sliding groove and the second sliding groove.

So, through setting up the connecting plate to realize the simultaneous movement of two sub-bottom plates, further improve forming device job stabilization nature.

In a possible embodiment, the second forming die is further provided with a filling opening, and the filling opening is communicated with the forming cavity.

So, through setting up the sprue to the filling process in the injection moulding improves forming device usability.

In a possible embodiment, the first forming mold is provided with a positioning groove, and the positioning groove is arranged on the first surface. And the second forming die is provided with a positioning part, and the positioning part is arranged on the second surface. When the first molding die and the second molding die are closed, the positioning part is embedded with the positioning groove.

So, through setting up location portion to improve the positioning accuracy of first forming die and second forming die, thereby improve the machining precision.

The forming device that this application provided, through the mode that sets up first guide way, the fluid is dredged in the gathering, derives the foreign matter and the impurity that produce in the forming process, avoids leading to blockking up or polluting fashioned product by foreign matter and impurity, has improved forming device's processingquality and product stability.

Drawings

Fig. 1 is a schematic structural view of a molding apparatus according to a first embodiment of the present application.

Fig. 2 is a schematic structural diagram of a first molding module in the molding apparatus shown in fig. 1.

Fig. 3 is a schematic structural view of a second molding module in the molding apparatus shown in fig. 1.

Fig. 4 is a cross-sectional view of a second molding die set in the molding apparatus shown in fig. 1.

Fig. 5 is a structural sectional view of the molding apparatus shown in fig. 1.

Description of the main elements

Molding apparatus 100

First molding die 10

First surface 11

First guide groove 111

First circulation section 112

First surrounding segment 113

First reservoir 114

Molding assembly 12

Shaping groove 121

Forming pin 122

Positioning block 123

First base plate 13

First embedding mechanism 14

First bottom block 15

Positioning slot 16

Second molding die 20

Second surface 21

The receiving groove 211

Second base plate 22

First sub-base 221

Second guide groove 222

Second sub-base 223

Third guide groove 224

Connecting plate 225

Second engaging mechanism 23

First guide block 24

Second guide block 25

Clamping block 26

Injection port 27

Positioning part 28

Forming cavity 30

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Referring to fig. 1, 2 and 5, a first embodiment of the present application provides a molding apparatus 100, including a first molding die 10 and a second molding die 20 adapted to be clamped, where the first molding die 10 includes a first surface 11 and a molding element 12 protruding from the first surface 11, the first surface 11 defines a first guiding groove 111 for accommodating and guiding oil, the first guiding groove 111 includes a first surrounding section 113 and a first flow-through section 112, and the first surrounding section 113 surrounds the molding element 12. The second molding die 20 includes a second surface 21 and a receiving groove 211 recessed in the second surface 21, the second surface 21 corresponds to the first surface 11, and a molding cavity 30 for molding a product is formed between the receiving groove 211 and the molding member 12. Before the first forming mold 10 and the second forming mold 20 are opened, oil is discharged through the first guide groove 111, and the oil is a turbid liquid including lubricating oil, impurities, foreign matters, and the like.

During the use of the molding apparatus 100, before the mold clamping, lubricating oil is applied to the first surface 11 and the second surface 21 which are in contact with each other, so as to reduce the friction between the first molding die 10 and the second molding die 20. Before the molding apparatus 100 is opened, the lubricating oil between the first surface 11 and the second surface 21 is pumped out by an external pumping device, and the first molding die 10 and the second molding die 20 are separated, so that the product in the molding cavity 30 is taken out. In this embodiment, the impurities and foreign substances mixed in the lubricating oil are also extracted together.

The product in this embodiment is a container housing with an arc-shaped end, which can be used to hold an object (the object includes but is not limited to an earphone). The outer surface of the molding member 12 and the inner surface of the receiving groove 211 are used to form the inner and outer arcs of the container.

Since the first surface 11 and the second surface 21 are relatively moved during the mold closing process, debris generated during the friction is mixed into the lubricating oil to contaminate the lubricating oil. The contaminated lubricating oil enters the molding cavity 30, and further contaminates the molding cavity 30, resulting in the appearance of discoloration in the molded product. Offer first guide way 111 on first surface 11, in compound die and forming process, fluid is mainly stored in first guide way 111, first circulation section 112 and first surrounding section 113 promptly, simultaneously through first surrounding section 113 with the route of fluid and the isolation of shaping chamber 30, thereby avoid fluid to flow into shaping chamber 30 and pollute the product, thereby play the effect that improves product quality and product stability, before the die sinking, the fluid of first guide way 111 can be used to discharge fluid again, first surrounding section 113 derives through first circulation section 112 promptly.

Referring to fig. 2, in an embodiment, the first surface 11 is further provided with a first oil reservoir 114 in cross communication with the first guide groove 111, and the size of the first oil reservoir 114 is smaller than that of the first guide groove 111. The first oil reservoir 114 is used for slightly storing and guiding the lubricating oil, and plays a role of lubricating the first surface 11 and the second surface 21. In this embodiment, the width and the depth of the first oil reservoir 114 are not greater than 0.3mm, and the width and the depth of the first oil reservoir 114 are not greater than 2mm and 1mm, respectively.

First guide way 111 and first oil storage tank 114 are set up alternately, and the equidimension such as the degree of depth, width of first guide way 111 is greater than first oil storage tank 114 simultaneously, can make first guide way 111 clear and fully communicate again with the function effect of first oil storage tank 114 to impurity, filth in the guide lubricating oil move to first guide way 111 from first oil storage tank 114 under the action of gravity, avoid causing first oil storage tank 114 to block up, thereby guarantee the lubrication of first surface 11 and second surface 21 and arrange miscellaneous effect. In some embodiments, the first oil reservoir 114 may not be communicated with the first guide groove 111, and when the external suction device sucks the first oil reservoir 114 before the mold is opened, the first oil reservoir enters the first guide groove 111 and is guided out through the first guide groove 111.

In one embodiment, the first forming mold 10 includes a first bottom plate 13 and a first embedding mechanism 14, the first embedding mechanism 14 includes a first bottom block 15 and the forming assembly 12, and the first bottom block 15 is embedded in the first bottom plate 13. The first surface 11 includes a surface of the first base plate 13 and a surface of the first bottom block 15, which are joined, the surface of the first base plate 13 is located on the first base plate 13, and the surface of the first bottom block 15 is located on the first bottom block 15. The first surrounding section 113 is located on the surface of the first bottom block 15 and surrounds the molding assembly 12, so that oil cannot enter the molding assembly 12, the molding cavity 30 is prevented from being polluted, and the cleanness of the injection molding product material is ensured.

The first molding die 10 is divided into the first bottom plate 13 and the first embedding mechanism 14, so that the first embedding mechanism 14 can be improved or replaced according to the product requirements in the using process, the cost and the working hour consumed by die modification during product iteration or replacement are reduced, the universality of the molding device 100 is improved, and the cost is reduced.

In an embodiment, the forming assembly 12 includes a plurality of forming pins 122 and a positioning block 123 connected to the first bottom block 15, the positioning block 123 has a plurality of forming slots 121 formed therein, and the forming pins 122 are movably disposed in the forming slots 121. When the first molding die 10 and the second molding die 20 are closed, the molding pin 122 is embedded in the molding groove 121, and the surfaces of the molding pin 122 and the molding groove 121 on the side facing the second molding die 20 are engaged with each other for molding a product.

Since the shape of the molded product is not always regular, in order to avoid deformation of the product caused by collision of the second molding die 20 with the product held by the molding apparatus 100 during mold opening, the molding assembly 12 is separated into the molding pin 122 and the positioning block 123. When the molding apparatus 100 is closed, the molding pin 122 is fully inserted into the molding groove 121 of the positioning block 123 to form an engaged continuous curved surface with the positioning block 123, and the continuous curved surface correspondingly forms a curved surface on the product structure. When the forming device 100 is opened, the forming pin 122 is separated from the forming groove 121, so that the product is not tightly attached to the forming assembly 12 any more, and the product is easily taken down while the product is prevented from being deformed due to collision with other parts, thereby improving the usability and stability of the forming device 100.

Referring to fig. 3, in an embodiment, the second molding die 20 includes a second bottom plate 22 and a second embedding mechanism 23, the second embedding mechanism 23 is embedded in the second bottom plate 22, the second surface 21 includes a surface of the second bottom plate 22 and a surface of the second embedding mechanism 23 facing the first molding die 10, and the receiving groove 211 is disposed on the second embedding mechanism 23. Similarly to the first molding die 10, the second molding die 20 is disassembled, so that when a product needs to be modified or replaced, it is not necessary to replace the entire second molding die 20, but only the second insertion mechanism 23 is modified or replaced. In this manner, versatility of the molding apparatus 100 is improved while reducing potential costs in use. In the present embodiment, two sets of the second base plate 22 and the second embedding mechanism 23 are included, but not limited thereto.

In one embodiment, the second base plate 22 includes a first sub base plate 221 and a second sub base plate 223, a second guide slot 222 is disposed on a side of the first sub base plate 221 away from the second sub base plate 223, and a third guide slot 224 is disposed on a side of the second sub base plate 223 away from the first sub base plate 221. The first guide block 24 is movably disposed in the second guide groove 222, and the second guide block 25 is movably disposed in the third guide groove 224. In this embodiment, two sets of the first guide blocks 24 and the second guide blocks 25 are also included, but not limited thereto.

The first guide block 24 and the second guide block 25 are fixed to the outside, the first sub-base plate 221 moves along the first guide block 24, the second sub-base plate 223 moves along the second guide block 25, and the respective moving directions are arranged at an angle, in this embodiment, the guide directions of the first guide block 24 and the second guide block 25 are staggered to form a splay shape, so that the first sub-base plate 221 and the second sub-base plate 223 are obliquely separated. Therefore, the processes of die assembly and die opening are smooth and orderly, and secondary contact on the formed product is avoided, so that the quality and the stability of the product are improved.

In an embodiment, the second forming mold 20 includes clamping blocks 26, and at least two groups of clamping blocks 26 are respectively disposed on the sides of the first guide block 24 and the second guide block 25 away from the second forming mold 20, and respectively abut against the first guide block 24 and the second guide block 25. The clamping block 26 is used for clamping the first guide block 24 and the second guide block 25, so that a lateral abutting effect is achieved, and the first guide block 24 and the second guide block 25 are prevented from being deviated in the using process, so that the product quality is prevented from being influenced. The clamping block 26 may improve the quality and stability of the product.

In an embodiment, the second forming mold 20 further includes a connecting plate 225, the first sub-base plate 221 is provided with a first sliding slot, the second sub-base plate 223 is provided with a second sliding slot, the first sliding slot and the second sliding slot are disposed opposite to each other, and the connecting plate 225 is movably disposed in the first sliding slot and the second sliding slot.

The embodiment includes two connecting plates 225, and the connecting plates 225 are approximately rectangular parallelepipeds. The first sliding groove and the second sliding groove are transversely arranged, the connecting plate 225 is simultaneously arranged in the first sliding groove and the second sliding groove in a moving mode, and the first sub-bottom plate 221 and the second sub-bottom plate 223 are movably connected together, so that the first sub-bottom plate 221 and the second sub-bottom plate 223 always keep moving synchronously on the same horizontal plane in the using process of the forming device 100, and the problem that the product quality is influenced due to the fact that the first sub-bottom plate 221 has the second sub-bottom plate 223 to move misplaced and offset in the die opening and die closing processes is avoided. The receiving groove 211 is formed by combining the first sub-base plate 221 and the second sub-base plate 223.

Referring to fig. 4, in an embodiment, the second forming mold 20 further includes a feeding port 27, and the feeding port 27 is communicated with the forming cavity. The injection port 27 is used for injecting the material after mold clamping to complete the molding of the product. The injection port 27 in this embodiment is disposed on the top of the second molding die 20 and located between the first sub-base plate 221 and the second sub-base plate 223. The material injection port 27 is arranged at the top so as to avoid obvious stub bars by controlling the material amount of the injected material.

In one embodiment, the first forming mold 10 is provided with a positioning groove 16, and the positioning groove 16 is disposed on the first surface 11. The second molding die 20 is provided with a positioning portion 28, and the positioning portion 28 is provided on the second surface 21. When the first molding die 10 and the second molding die 20 are closed, the positioning portion 28 is fitted in the positioning groove 16. In this embodiment, four positioning grooves 16 are disposed at four corners of the first surface 11. The positioning portions 28 protrude from the second surface 21 and correspond to the positioning grooves 16, respectively, so as to accurately position the first molding die 10 and the second molding die 20 during mold closing, thereby ensuring the processing quality of the molding apparatus 100.

When the first molding die 10 is used, the first embedding mechanism 14 in the first molding die 10 is embedded into the first base plate 13, and lubricating oil is coated on the first surface 11. At this time, the forming pin 122 is not completely inserted into the forming groove 121. When the mold is closed, the first sub-base plate 221 is folded toward the first molding die 10 along the first guide block 24 and the second sub-base plate 223 along the second guide block 25, at this time, the molding pin 122 is completely inserted into the molding groove 121, and the molding pin 122 and the surface of the molding assembly 12 form a smooth and complete arc surface. When the first sub-base plate 221 and the second sub-base plate 223 are completely folded, the first surface 11 and the second surface 21 are completely contacted, and the lubricating oil is located between the first surface 11 and the second surface 21, and mainly located in the first oil storage groove 114 and the first guide groove 111. Then, the material is injected into the molding cavity through the injection port 27, and the product is molded. After the product is formed, the mold is opened, firstly, the lubricating oil is completely pumped out by an external pumping device, then the first sub-base plate 221 moves along the first guide block 24 and the second sub-base plate 223 along the second guide block 25 respectively to be separated from the first forming mold 10, in the process, the forming pin 122 gradually separates from the forming groove 121, the product falls off from the forming assembly 12, and one-step product forming is completed.

It should be noted that, in the present embodiment, the first oil reservoir 114 and the first guide groove 111 are only disposed on the first surface 11, and the second surface 21 is not limited. The second surface 21 may also be provided with a similar reservoir and guide groove arrangement to achieve the same function.

It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.

Although the present application has been described in detail with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present application.

Claims (10)

1. A molding device comprises a first molding die and a second molding die which are matched in matched mode, and is characterized in that the first molding die comprises a first surface and a molding assembly protruding out of the first surface, the first surface is provided with a first guide groove used for containing and dredging oil, the first guide groove comprises a first surrounding section and a first circulation section which are communicated, and the first surrounding section surrounds the molding assembly;

the second forming die comprises a second surface and a containing groove concavely arranged on the second surface, the second surface corresponds to the first surface, and a forming cavity for forming a product is formed between the containing groove and the forming assembly; wherein the content of the first and second substances,

before the first forming die and the second forming die are opened, the oil is discharged through the first guide groove.

2. The molding apparatus as defined in claim 1, wherein said first surface is further provided with a first oil reservoir in cross communication with said first guide groove, said first oil reservoir being smaller in size than said first guide groove.

3. The molding apparatus as defined in claim 1, wherein said first molding die includes a first base plate and a first embedding mechanism, said first embedding mechanism including a first shoe and said molding assembly, said first shoe being embedded in said first base plate;

the first surface comprises an engaged first floor surface and a first sole block surface, the first floor surface being located on the first floor and the first sole block surface being located on the first sole block; wherein the content of the first and second substances,

the forming assembly protrudes out of the surface of the first bottom block, and the first surrounding section is located on the surface of the first bottom block.

4. The molding device as defined in claim 3, wherein the molding assembly includes a molding pin and a positioning block connected to the first bottom block, the positioning block being formed with a molding groove, the molding pin being movably disposed in the molding groove; wherein the content of the first and second substances,

when the first forming die and the second forming die are closed, the forming pin is embedded in the forming groove, and the forming pin is connected with the forming groove on the surface of one side facing the second forming die.

5. The molding apparatus as defined in claim 1, wherein said second molding die includes a second base plate and a second insert mechanism, said second insert mechanism being embedded in said second base plate, said second surface including a surface of said second base plate facing said first molding die and said second insert mechanism, said receiving groove being formed in said second insert mechanism.

6. The molding apparatus as defined in claim 5, wherein said second base plate comprises a first sub-base plate and a second sub-base plate, to which a first guide block and a second guide block are respectively connected; a second guide groove is formed in one side, away from the second sub-bottom plate, of the first sub-bottom plate, and a third guide groove is formed in one side, away from the first sub-bottom plate, of the second sub-bottom plate; the first guide block is movably arranged in the second guide groove, and the second guide block is movably arranged in the third guide groove.

7. The molding apparatus as claimed in claim 6, wherein the second molding die further comprises clamping blocks, and at least two sets of the clamping blocks are respectively disposed on the first guide block and the second guide block at a side away from the second molding die and respectively abut against the first guide block and the second guide block.

8. The molding apparatus as defined in claim 6, wherein said second molding die further includes a connecting plate, said first sub-base plate has a first sliding slot, said second sub-base plate has a second sliding slot, said first sliding slot and said second sliding slot are disposed opposite to each other, said connecting plate is movably disposed in said first sliding slot and said second sliding slot.

9. The molding apparatus as defined in claim 1, wherein said second molding die further includes a sprue, said sprue communicating with said molding cavity.

10. The molding apparatus as defined in claim 1, wherein said first mold has a positioning groove formed therein, said positioning groove being formed in said first surface; the second forming die is provided with a positioning part, and the positioning part is arranged on the second surface; wherein, the first and the second end of the pipe are connected with each other,

when the first forming die and the second forming die are closed, the positioning part is embedded with the positioning groove.

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