Rubber-coated pipe fitting mold capable of improving appearance quality

Abstract

The utility model relates to the technical field of pipe fitting production dies, in particular to a rubber-coated pipe fitting die capable of improving appearance quality, which comprises a rear die core, a first cavity positioned in the rear die core, a front die core and a second cavity positioned in the front die core. The second cavity is communicated with the first cavity and forms a product cavity for forming a product, a mold sticking surface is arranged on the wall surface of the first cavity, a concave part is arranged on the mold sticking surface, and the mold sticking surface is used for adsorbing a formed workpiece on the wall surface of the first cavity after mold opening. By sacrificing the surface precision of a small part of the surface without the smoothness requirement, the workpiece is stably adsorbed on the first cavity, so that the success rate of the clamping operation of the manipulator is increased, the workpiece is prevented from naturally falling under the action of gravity and being collided to generate deformation, and the working efficiency is improved. And the yield and the surface smoothness of the formed workpiece are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipe production mould, more particularly to a rubber coated pipe mould capable of improving appearance quality. BACKGROUND

[0002] PVC pipe fittings with metal lining have the advantages of convenient installation, good sealing, high compression strength, etc., and are widely used in the market. The product specifications are commonly 20x1 / 2", 25x1 / 2", 25x3 / 4", 32x1 / 2", 32x3 / 4", Φ32x1", etc. The conventional injection mould (one mould with multiple cavities) structure is used for such pipe fitting products, the metal insert is positioned in the mould core, the mould is closed, the glue is injected, coated, cooled and shaped, the product is pushed out as a whole by the ejector pin mechanism and collected, and then the manual detection and packaging operations are carried out offline.

[0003] In the above production process, the injection-molded workpiece is often ejected in the form of a ejector rod or ejector pin, and is collected by falling under the action of gravity. However, since the molded workpiece still has a high temperature during the falling process, it is easy to deform and collide, which affects the shape and surface finish of the molded workpiece. To solve this problem, a practical robot is selected to clamp and collect the molded workpiece. The robot clamps the removable sprue next to the molded workpiece to avoid damage to the shape of the molded workpiece. However, sometimes the surface finish of the molded workpiece is required to be higher, and the surface precision of the cavity surface is also higher, which results in insufficient adsorption force between the molded workpiece and the cavity surface. At the moment of mold opening, the sprue is pulled out from the outer gate under the action of the mechanism, and the molded workpiece falls off the cavity surface due to insufficient adsorption force between the molded workpiece and the cavity surface, resulting in failure of the robot clamping. SUMMARY

[0004] The utility model aims at overcoming the problem of insufficient adsorption force between the molded workpiece and the cavity surface in the prior art, and the workpiece naturally falls off the cavity surface, resulting in failure of the robot clamping, and provides a rubber coated pipe mould capable of improving appearance quality

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] The utility model provides a rubber coated pipe mould capable of improving appearance quality, which comprises a rear mould core, a first cavity in the rear mould core, a front mould core, and a second cavity in the front mould core. When the front mould core and the rear mould core are in contact and closed, the second cavity and the first cavity are in communication and form a product cavity for product forming. A sticking surface is arranged on the wall surface of the first cavity, and a plurality of recesses are arranged on the sticking surface. The sticking surface is used to adsorb the molded workpiece on the wall surface of the first cavity after mold opening.

[0007] In the working process of the above scheme, first, the injection molding machine is started, and the mold is closed under the action of mechanical force. The front mold core and the rear mold core contact and closely fit under the action of the mold clamping force. The first cavity and the second cavity form a complete cavity. After the external core is pushed in, the injection program of the injection machine is started. After injection and cooling, the molded workpiece shrinks. The recess on the sticking surface is a kind of sunken pattern, and the surface has large and small pits. According to the metal encapsulation shrinkage principle, the metal rigid profile will restrict the shrinkage of the rubber material close to the metal, and the setting of the recess can also increase the contact area between the workpiece and the surface of the first cavity to increase the adsorption force. At the moment of mold opening, the front mold core separates from the rear mold core. Due to the cooling shrinkage of the workpiece, the extrusion force between the workpiece and the two cavity surfaces is small, and the extrusion force between the core and the workpiece is also small. After core pulling and mold opening are completed, the rear mold core has a sticking surface, and the recess on the sticking surface increases the adsorption area of the first cavity, so that the workpiece can be adsorbed on the surface of the first cavity when the mold is opened. At this time, the water gate part of the rough workpiece is clamped by the mechanical hand. The whole process sacrifices the surface precision of the small part of the surface which has no finish requirement, realizes stable adsorption of the workpiece on the first cavity, increases the success rate of the mechanical hand clamping operation, avoids the workpiece from falling naturally under the action of gravity and colliding to produce deformation, and effectively improves the yield rate and surface finish of the molded workpiece.

[0008] Further, the wall surface of the first cavity is provided with a first forming groove, and the sticking surface is located in the first forming groove; the first forming groove is used for forming the bell mouth boss of the pipe fitting. After the molded workpiece cools and shrinks, the overall shape of the workpiece is smaller than the cavity. The bell mouth boss will also shrink in the first forming groove. Most of the surface of the cavity has finish requirement, while the surface finish of the wall surface in the first forming groove can not be required according to the actual production needs. The wall surface can be set as a sticking surface with large surface roughness to adsorb the workpiece.

[0009] Further, the first forming groove includes a first wall surface, a bottom surface and a second wall surface. The first wall surface is located in the first forming groove away from the geometric center of the rear mold core. The other side wall of the first forming groove is the second wall surface. The bottom surface connects the first wall surface and the second wall surface to form the profile surface of the entire first forming groove, effectively forming the bell mouth boss.

[0010] Further, the first wall surface is perpendicular to the axial direction of the first cavity, and the second wall surface is inclined to the axial direction of the first cavity; the direction in which the second wall surface is inclined to the axial direction of the first cavity should be a direction conducive to the mechanical hand pulling out the workpiece; the first wall surface is perpendicular to the axial direction of the first cavity, so that the profile of the entire first forming groove is a right trapezoid, wherein the first wall surface forms a vertical end surface of the spout boss of the workpiece; the profile of the right trapezoid can reduce the probability of the workpiece falling off the first cavity naturally, because if a profile similar to an isosceles trapezoid is used, the first forming groove will be difficult to tightly hold the spout boss, thereby causing the workpiece to fall off more easily, and on the other hand, the workpiece does not need to be pulled out by a large mechanical force when the mechanical hand clamps it.

[0011] Further, the first wall surface and / or the second wall surface is / are provided as the sticking die surface; the sticking die surface can be provided on only the first wall surface or the second wall surface, or can be provided on both the first wall surface and the second wall surface.

[0012] Further, the latent spout insert is detachably installed in the front mold core; the latent spout insert is used to break and separate the workpiece and the integrally formed nozzle material of the workpiece when the front mold core and the rear mold core are opened; after long-term use, the part of the latent spout insert that cuts is prone to damage, and when the insert is damaged, it can be detached and replaced.

[0013] Further, one end of the latent spout insert is in communication with the runner of the front mold core, and the other end is in communication with one end of the runner of the front mold core close to the second cavity; after the molten glue enters the inner runner, it enters the first cavity and the second cavity through the latent spout insert, and after cooling and solidification, the latent spout insert breaks and separates the workpiece and the nozzle material at the interface between the cavity and the latent spout insert when the mold is opened.

[0014] Further, the latent spout insert is provided with a forming part for forming the wall surface of the second cavity, and the forming part is located at one end of the latent spout insert connected to the second cavity; after the latent spout insert is installed in the front mold core, the side surface of the forming part contacts the cavity space and forms part of the cavity wall surface, and the side surface is provided with a glue inlet; the wall surface around the glue inlet is a sharp blade wall surface, which facilitates cutting of the nozzle material; after the molten glue enters the cavity through the glue inlet of the side surface and completes injection of the molten glue, the shape of the workpiece is consistent with the shape of the side surface of the forming part.

[0015] Further, an end surface of the forming part in contact with the second cavity is provided with a second forming groove, an inner surface of the second forming groove constituting part of a wall surface of the second cavity; the second forming groove is used to form a flat boss on the arc surface of the workpiece, and from the process parameters of the size design of the glue inlet of the mold and the actual production, when the glue inlet is an arc surface, the thin wall around the glue inlet is difficult to cut the arc surface flat, and a pit will be cut in the position of the workpiece, the size of the glue inlet section cannot be too small, only a larger size can be used, and the increase of the section size will exacerbate the formation of the pit when cutting off, by forming a flat boss on the arc surface of the workpiece through the second forming groove, the section size of the glue inlet can be made smaller, and the section size of the glue inlet cutting off the runner is a flat end surface, so that the forming part can cut off the runner along the flat end surface without breaking and forming a pit, effectively improving the appearance quality of the formed workpiece.

[0016] Further, the insert flow channel is arranged in the insert, and the insert flow channel is communicated with the flow channel of the front mold core and the second cavity; the insert flow channel is used for communicating the inner runner of the front mold core with the cavity, and the insert flow channel penetrates the forming part and is communicated with the flow channel of the front mold core and the second cavity from the interface between the second forming groove and the second cavity.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] 1. The second cavity is communicated with the first cavity and constitutes a product cavity for product forming, a sticking surface is arranged on the wall surface of the first cavity, a recess is arranged on the sticking surface, the sticking surface is used to adsorb the formed workpiece on the wall surface of the first cavity after the mold is opened, the recess on the sticking surface increases the adsorption area of the first cavity, and the workpiece can be adsorbed on the surface of the first cavity when the mold is opened, at this time, the runner part of the blank workpiece is clamped by the mechanical hand, the surface precision of a small part of surface without finish requirement is sacrificed in the whole process, the workpiece is stably adsorbed on the first cavity, the success rate of the clamping operation of the mechanical hand is increased, the workpiece is prevented from falling naturally under the action of gravity and colliding to deform, and the yield rate and surface finish of the formed workpiece are effectively improved.

[0019] 2. The latent nozzle insert is installed in the front mold core; the latent nozzle insert is designed to be detachable, and the latent nozzle insert is installed in the front mold core. The function of the latent nozzle insert is to break and separate the water gap material formed integrally with the workpiece when the front mold core and the rear mold core are opened. The latent nozzle insert is provided with a forming part for forming a wall surface of the second cavity. The end surface of the forming part in contact with the second cavity is provided with a second forming groove. A flat boss is formed on the arc surface of the workpiece through the second forming groove. The cross-sectional size of the inlet can be made smaller, and the cross-section of the inlet cutting the water gap material is a flat end surface. The forming part can cut the water gap material along the flat end surface without breaking to form a pit, effectively improving the appearance quality of the formed workpiece. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The rear mold core of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame.

[0021] Figure 2 The rear mold core of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame.

[0022] Figure 3 The rear mold core of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame. Figure 2 The local enlarged view of A in the middle.

[0023] Figure 4 The front mold core of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame.

[0024] Figure 5 The latent nozzle insert of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame.

[0025] Figure 6 The latent nozzle insert of the encapsulated pipe fitting mold for improving the appearance quality is installed on the mold frame.

[0026] In the drawings: 1, rear mold core; 110, first cavity; 120, first forming groove; 121, first wall surface; 122, bottom surface; 123, second wall surface; 2, front mold core; 210, second cavity; 3, sticking surface; 310, recess; 4, latent nozzle insert; 410, forming part; 411, second forming groove; 420, insert runner. DETAILED DESCRIPTION

[0027] The utility model makes further explanation in combination with specific implementation. Among them, the drawing is only for example explanation, and the representation is only a schematic diagram, and cannot be understood as the limitation to the patent; in order to better explain the embodiment of the utility model, some components of the drawing can be omitted, enlarged or reduced, and do not represent the size of actual product; for those skilled in the art, it is understandable that some well-known structures in the drawing and their description can be omitted.

[0028] The same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar components; in the description of the utility model, it is understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawing, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore the terms describing the position relationship in the drawing are only for example explanation, and cannot be understood as the limitation to the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific situation.

[0029] Embodiment 1

[0030] The embodiment is a first embodiment of rubber-coated pipe fitting mold capable of improving appearance quality, as shown in Figures 1 to 4 The embodiment is a first embodiment of rubber-coated pipe fitting mold capable of improving appearance quality, as shown in

[0031] Specifically, the wall surface of the first cavity 110 is provided with a first forming groove 120, and the sticking surface 3 is located in the first forming groove 120; the first forming groove 120 is used for forming the socket boss of the pipe fitting, and after the cooling and shrinkage of the forming workpiece, the overall shape of the workpiece is smaller than the cavity, and the socket boss will also shrink in the first forming groove 120, most of the surface of the cavity has smoothness requirement, and the wall surface in the first forming groove 120 can not be required according to the actual production requirement, and the wall surface can all be set as the sticking surface 3 with large surface roughness to adsorb the workpiece.

[0032] Specifically, the first forming groove 120 includes a first wall surface 121, a bottom surface 122 and a second wall surface 123. The first wall surface 121 is located at a side of the first forming groove 120 away from the geometric center of the back mold core 1, and the other side wall of the first forming groove 120 is the second wall surface 123. The bottom surface 122 connects the first wall surface 121 and the second wall surface 123 to form the profile surface of the entire first forming groove 120, and effectively forms the socket boss.

[0033] Specifically, the first wall surface 121 and the second wall surface 123 can be provided as the sticking mold surface 3. The sticking mold surface 3 can be provided only on the first wall surface 121 or the second wall surface 123, or both the first wall surface 121 and the second wall surface 123.

[0034] The working principle of the encapsulated pipe part mold capable of improving the appearance quality of the present embodiment is as follows:

[0035] Start the injection molding machine, the front mold core 2 contacts the back mold core 1 and tightly fits under the action of the mold locking force, the first cavity 110 and the second cavity 210 form a complete cavity, and then the external core is pushed in. Start the injection program of the injection molding machine, complete injection and cooling, the molded workpiece shrinks, the recess part 310 on the sticking mold surface 3 can increase the contact area between the workpiece and the surface of the first cavity 110. At the moment of mold opening, the front mold core 2 separates from the back mold core 1, under the cooling shrinkage action of the workpiece, the extrusion force between the workpiece and the two cavity surfaces becomes smaller, and the extrusion force between the core and the workpiece also becomes smaller. After the core pulling and mold opening are completed, because the first forming groove 120 has the sticking mold surface 3, the recess part 310 on the sticking mold surface 3 increases the adsorption area of the first cavity 110, so that the workpiece can be adsorbed on the surface of the first cavity 110 when the mold is opened. Finally, the mechanical hand clamps the nozzle material part of the rough workpiece to take out the workpiece.

[0036] The beneficial effects of the present embodiment are: by sacrificing the surface precision of a small part of the surface without finish requirement, the workpiece is stably adsorbed on the first cavity 110, the success rate of the mechanical hand clamping operation is increased, the workpiece is prevented from falling naturally under the action of gravity and colliding to produce deformation, and the yield rate and surface finish of the molded workpiece are effectively improved.

[0037] Embodiment 2

[0038] The first embodiment of the encapsulated pipe part mold capable of improving the appearance quality of the present embodiment is different from the first embodiment in that:

[0039] As Figure 3As shown, specifically, the first wall surface 121 is perpendicular to the axial direction of the first cavity 110, and the second wall surface 123 is inclined to the axial direction of the first cavity 110; the direction in which the second wall surface 123 is inclined to the axial direction of the first cavity 110 should be a direction conducive to the mechanical hand pulling out the workpiece; the first wall surface 121 is perpendicular to the axial direction of the first cavity 110, so that the profile of the entire first forming groove 120 is a right trapezoid, wherein the first wall surface 121 forms a vertical end surface of the spigot boss of the workpiece; the profile of the right trapezoid can reduce the probability of the workpiece falling off the first cavity 110 naturally, because if a profile similar to an isosceles trapezoid is used, the first forming groove 120 will not be able to tightly grip the spigot boss, thereby causing the workpiece to fall off more easily, and on the other hand, the workpiece can be taken out without too much mechanical force when the mechanical hand clamps.

[0040] The working principle of the encapsulated pipe fitting mold capable of improving the appearance quality of the present embodiment is as follows:

[0041] After the mold is opened, the included angle formed by the first wall surface 121 and the second wall surface 123 strengthens the adsorption effect of the sticking surface 3, the sticking surface 3 adsorbs the spigot boss of the formed workpiece, and the entire workpiece is adsorbed on the surface of the first cavity 110.

[0042] The beneficial effects of the present embodiment are as follows: by setting the first wall surface 121 perpendicular to the axial direction of the first cavity 110 and the second wall surface 123 inclined to the axial direction of the first cavity 110, the profile of the entire first forming groove 120 is a right trapezoid, which can tightly grip the spigot boss of the pipe fitting and prevent it from falling off naturally when the mold is opened, and the workpiece can be taken out without too much mechanical force when the mechanical hand clamps.

[0043] Embodiment 3

[0044] The present embodiment is a third embodiment of an encapsulated pipe fitting mold capable of improving the appearance quality, as shown in Figures 4 to 6 The difference from the first embodiment is that:

[0045] Specifically, it further comprises a latent mouth insert 4 installed in the front mold core 2; the latent mouth insert 4 is designed to be detachable, and the latent mouth insert 4 is installed in the front mold core 2; the function of the latent mouth insert 4 is to break and separate the workpiece and the water gap integrally formed with the workpiece when the front mold core 2 and the rear mold core 1 are opened; after long-term use, the part of the latent mouth insert that cuts is prone to damage; when the insert is damaged, it can be detached and replaced.

[0046] Specifically, one end of the latent gate insert 4 is in communication with the gate of the front cavity bush 2, and the other end is in communication with one end of the second cavity 210 close to the gate of the front cavity bush 2; after the molten glue enters the inner gate, it enters the first cavity 110 and the second cavity 210 through the latent gate insert 4, and after cooling and solidification, the latent gate insert 4 is pulled off at the interface between the cavity and the molten glue interface of the latent gate insert 4 when the mold is opened, and the gate material is separated.

[0047] Specifically, the latent gate insert 4 is provided with a forming part 410 for forming a wall surface of the second cavity 210, and the forming part 410 is located at one end of the latent gate insert 4 connected with the second cavity 210; after the latent gate insert 4 is installed and embedded in the front cavity bush 2, the side surface of the forming part 410 is in contact with the cavity space and forms part of the cavity wall surface, and the side surface is provided with a glue inlet, and the wall surface around the glue inlet is a sharp blade wall surface, which facilitates cutting off the gate material; after the molten glue enters the cavity from the glue inlet on the side surface and completes the injection of the molten glue, the shape of the workpiece is consistent with the shape of the side surface of the forming part 410.

[0048] Specifically, the end surface of the forming part 410 in contact with the second cavity 210 is provided with a second forming groove 411, and the inner surface of the second forming groove 411 forms part of the wall surface of the second cavity 210; the second forming groove 411 is used to form a flat boss on the arc surface of the workpiece, and from the process parameters of the design of the glue inlet size and the actual production, when the glue inlet is an arc surface, it is difficult to cut the arc surface flat with the thin wall around the glue inlet, which will cut out a pit at the position of the workpiece, and the cross-sectional size of the glue inlet cannot be too small, only a larger size can be used, and the increase of the cross-sectional size will exacerbate the formation of pits on the arc surface during the cutting and pulling off, therefore, by forming a flat boss on the arc surface of the workpiece through the second forming groove 411, the cross-sectional size of the glue inlet can be made smaller, and the cross section of the cutting and pulling off of the gate material by the glue inlet is a flat end surface, so that the forming part 410 can cut off the gate material along the flat end surface without pulling off and forming a pit, effectively improving the appearance quality of the formed workpiece.

[0049] Specifically, the latent gate insert 4 is provided with an insert runner 420, and the insert runner 420 is in communication with the runner of the front cavity bush 2 and the second cavity 210; the insert runner 420 is used to communicate the inner gate of the front cavity bush 2 with the cavity, and the insert runner 420 penetrates the forming part 410 and communicates the runner of the front cavity bush 2 with the second cavity 210 from the interface between the second forming groove 411 and the second cavity 210.

[0050] The working principle of the encapsulated pipe mold of the embodiment for improving the appearance quality is as follows:

[0051] The melt glue enters the cavity through the inner gate and the insert runner 420, and a boss is formed on the arc outer surface of the workpiece under the action of the second forming groove 411 of the forming part 410. When the mold is opened, the front mold core 2 moves away from the rear mold core 1, the thin wall of the second forming groove 411 of the diving insert cuts off the pipe and the runner material. Since the core of the rear mold core 1 has not been pulled out at this time, although the cutting force is very large, the workpiece cannot be pulled off, and the pipe still stays on the surface of the first cavity 110. Then the core of the rear mold core 1 is slowly pulled out, and the workpiece is adsorbed on the surface of the first cavity 110 under the action of the sticking surface 3. Finally, the pipe is clamped by using a soft clamp mechanical hand, and the operation is completed.

[0052] The beneficial effects of the embodiment are that a flat boss is formed on the arc surface of the workpiece by the second forming groove 411, the cross-sectional size of the glue inlet can be made smaller, and the cross-section of the glue inlet cutting and pulling off the runner material is a flat end face. The forming part 410 can cut off the runner material along the flat end face without pulling off to form a pit, effectively improving the appearance quality of the molded workpiece.

[0053] In the specific content of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. In order to make the description simple, all possible combinations of the above technical features are not described, but as long as the combination of these technical features does not exist contradiction, it should be considered as the scope of the present application.

[0054] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A mold for rubber-coated pipe fittings that improves appearance quality, comprising a rear mold core (1), a first cavity (110) located within the rear mold core (1), a front mold core (2), and a second cavity (210) located within the front mold core (2), wherein after the front mold core (2) and the rear mold core (1) are in contact and closed, the second cavity (210) communicates with the first cavity (110) and forms a product cavity for product molding, characterized in that, A molding surface (3) is provided on the wall of the first cavity (110), and a plurality of recesses (310) are provided on the molding surface (3). The molding surface (3) is used to adsorb the molded workpiece onto the wall of the first cavity (110) after the mold is opened.

2. The mold for rubber-coated pipe fittings that can improve appearance quality according to claim 1, characterized in that, A first molding groove (120) is provided on the wall surface of the first cavity (110), and the adhesive surface (3) is located in the first molding groove (120).

3. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 2, characterized in that, The first molding groove (120) includes a first wall surface (121), a bottom surface (122) and a second wall surface (123). The first wall surface (121) is located on the side of the first molding groove (120) away from the geometric center of the rear mold core (1). The other side wall of the first molding groove (120) is the second wall surface (123).

4. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 3, characterized in that, The first wall surface (121) is perpendicular to the axial direction of the first cavity (110), and the second wall surface (123) is inclined to the axial direction of the first cavity (110).

5. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 3, characterized in that, The first wall surface (121) and / or the second wall surface (123) are configured as the adhesive surface (3).

6. A mold for rubber-coated pipe fittings that can improve appearance quality according to any one of claims 1-5, characterized in that, It also includes a hidden opening insert (4), which is installed inside the front mold core (2).

7. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 6, characterized in that, One end of the sprue insert (4) is connected to the sprue of the front mold core (2), and the other end is connected to the end of the second cavity (210) near the sprue of the front mold core (2).

8. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 7, characterized in that, The lurking port insert (4) is provided with a forming part (410) for forming the wall of the second cavity (210), and the forming part (410) is located at the end where the lurking port insert (4) is connected to the second cavity (210).

9. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 8, characterized in that, The end face of the molding part (410) that contacts the second cavity (210) is provided with a second molding groove (411), and the inner surface of the second molding groove (411) forms part of the wall surface of the second cavity (210).

10. A mold for rubber-coated pipe fittings that can improve appearance quality according to claim 6, characterized in that, The recessed insert (4) is provided with an insert flow channel (420), which connects the flow channel of the front mold core (2) with the second cavity (210).

Images