Nut rubber bowl mold

Abstract

The utility model relates to the technical field of mold forming, in particular to a nut rubber bowl mold which comprises a nut rubber bowl, a metal shell arranged on the outer side of the nut rubber bowl and a mold structure, a lip is arranged inside the nut rubber bowl, the mold structure comprises a lower mold, a middle mold and an upper mold which are sleeved together, a protruding block is arranged on the upper portion of the lower mold, and the protruding block is arranged on the middle mold. The center of circle of the middle die is aligned with the center of circle of the lower die, the metal shell is arranged on the outer side of the middle die, the upper die is detachably connected with the die core, the lower die is sleeved with the upper die, the upper die is sleeved with the middle die, an inclined table is arranged at one end of the die core, and the die structure, the die core and the metal shell are combined to jointly die-cast a nut rubber bowl. According to the utility model, the parting surface is far away from the lip position in the forming process, so that the situation that the sealing lip is damaged due to manual deburring and the sealing performance of the nut rubber bowl is influenced can be effectively prevented, and the reliability of the product quality is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mold forming, in particular to a nut rubber bowl mold. Background Art

[0002] The nut rubber bowl is specially used for the axial joint of the helicopter rotor hub. Since the nut rubber bowl is die-cast through two upper and lower molds, a metal shell is bonded to the outside of the nut rubber bowl after die-casting. The connection between the two molds is often at the lip position of the nut rubber bowl. After the casting is completed, a parting surface will appear at the lip position. There will be more burrs on the parting surface, which will weaken the strength of the parting surface and make it easy to break. During helicopter maintenance, axial joint movement often occurs. During the movement, the lip of the nut rubber bowl will be rubbed, which will cause the parting surface to break and oil leakage to occur.

[0003] The existing technology is to use a nut rubber bowl mold to cast a nut rubber bowl. After the nut rubber bowl is formed, the burrs on the lip of the nut rubber bowl are manually removed or the lip is cut with an oil seal trimming machine to ensure the lip size and appearance quality. However, the above two methods are easy to damage the sealing lip base. For oil seal rubber bowls with high sealing performance requirements, it is difficult to ensure their sealing performance. Moreover, in the existing technology, the connection between the nut rubber bowl and the metal shell is not achieved in one process, but the metal shell is bonded after the nut rubber bowl is cast. This method is difficult to fix the bonding position and the bonding process is relatively difficult. Utility Model Content

[0004] In response to the technical problems existing in the background technology, the purpose of the present utility model is to provide a nut rubber bowl mold, which makes the parting surface leave the lip position during the molding process, so as to prevent the axial joint from rubbing the parting surface during the maintenance process, thereby preventing oil leakage.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0006] A nut rubber bowl mold comprises a nut rubber bowl and a metal shell arranged on the outside of the nut rubber bowl and a mold structure. A lip is arranged inside the nut rubber bowl. The mold structure comprises a lower mold, a middle mold and an upper mold. A positioning pin is arranged at the center position of the lower mold. A protrusion is arranged on the upper part of the lower mold. A mold core is detachably arranged on the protrusion. The centers of the middle mold and the lower mold are aligned. A plug is arranged at one end of the middle mold. The metal shell is arranged on the outside of the middle mold. A special-shaped stopper is arranged at one end of the upper mold. The upper mold is detachably connected to the mold core. The middle mold is arranged on the outside of the upper mold. A ramp is arranged at one end of the mold core.

[0007] Preferably, the lower die and the protrusion are both stepped, a groove is provided on the protrusion, the lip is located at the groove, and the positioning pin passes through the lower die and the protrusion and extends from the upper end of the protrusion.

[0008] Preferably, a connecting hole is provided inside the mold core, and when the mold core and the protrusion are connected, the positioning pin extends into the connecting hole.

[0009] Preferably, a through groove having the same shape as the mold core is provided inside the upper mold, and a support plate I is provided at one end of the upper mold. When the support plate I and the mold core are parallel, the special-shaped stopper is located at the groove position.

[0010] Preferably, the interior of the middle mold is hollow, the upper mold is connected to the interior of the middle mold, and the upper mold and the middle mold are detachably connected, and a support plate II is provided at one end of the middle mold.

[0011] Preferably, the metal shell is an annular structure, and a first groove and a second groove are provided inside the metal shell. The bottom of the metal shell abuts against the lower mold. When the support plate II and the upper end of the metal shell abut, the plug is in the first groove position, and when the special-shaped stopper is aligned with the groove, the special-shaped stopper is in the second groove position.

[0012] Preferably, the nut rubber bowl is composed of a groove, a ramp, a special-shaped stopper, a plug, a first groove and a cavity enclosed by the second groove.

[0013] The utility model has the following advantages and beneficial effects:

[0014] 1. In the present invention, by optimizing the mold structure of the nut rubber bowl, the parting surface is kept away from the lip position during the molding process, which can effectively prevent the sealing lip from being damaged by manual deburring, thereby affecting the sealing performance of the nut rubber bowl, and further improving the reliability of product quality.

[0015] 2. In the utility model, the size of the nut rubber bowl is formed by molding in one step, and there is no need to perform re-processing on the size, which can effectively prevent the size from being scrapped due to the re-processing. At the same time, the metal shell is one of the die-cast parts, so that the die-cast rubber bowl fits the metal shell more closely after casting. At the same time, the two can be bonded at the upper end of the lower mold after casting, and the pouring of the nut rubber bowl and the bonding of the nut rubber bowl and the metal shell can be realized at one time, which not only improves the manufacturing efficiency of the nut rubber bowl, but also further improves the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the connection of a nut rubber bowl mold provided by the utility model;

[0017] Figure 2 This is a schematic diagram of the connection between the lower die, protrusion and positioning pin of a nut rubber bowl mold provided by the utility model;

[0018] Figure 3 This is a cross-sectional view of a mold core of a nut rubber bowl mold provided by the utility model;

[0019] Figure 4 This is a cross-sectional view of an upper mold of a nut rubber bowl mold provided by the utility model;

[0020] Figure 5 This is a cross-sectional view of the middle mold of a nut rubber bowl mold provided by the utility model;

[0021] Figure 6 This is a cross-sectional view of the metal shell of a nut rubber bowl mold provided by the utility model;

[0022] Figure 7 This is an exploded view of a nut rubber bowl mold provided by the utility model;

[0023] Figure 8 A schematic diagram of a nut rubber bowl of a nut rubber bowl mold provided by the utility model;

[0024] Figure 9 This is a partial enlarged view of a nut rubber bowl mold provided by the utility model;

[0025] Icons: 1- nut rubber bowl, 101- lip, 2- lower die, 21- bump, 201- groove, 3- positioning pin, 4- core, 41- connecting hole, 42- convex plate, 43- ramp, 5- upper die, 51- support plate I, 52- slot, 53- special-shaped stopper, 54- through slot, 6- middle die, 61- support plate II, 62- plug, 7- metal shell, 71- first groove, 72- second groove, 73- third groove, A- parting surface. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0028] Example

[0029] like Figure 1-9As shown, a nut rubber bowl mold includes a nut rubber bowl 1 and a metal shell 7 arranged on the outside of the nut rubber bowl 1 and a mold structure. The interior of the nut rubber bowl 1 is provided with a lip 101. The mold structure includes a lower mold 2, a middle mold 6 and an upper mold 5 that are arranged together. One end of the middle mold 6 is provided with a plug 62, and one end of the upper mold 5 is provided with a special-shaped stopper 53. A positioning pin 3 is provided at the center position of the lower mold 2, and a protrusion 21 is provided on the upper part of the lower mold 2. The upper part of the protrusion 21 is detachably provided with a mold core 4 The lower die 2 and the protrusion 21 are both stepped, and a groove 201 is provided on the circumferential outer wall of the protrusion 21. When the nut rubber bowl 1 is die-cast, the lip 101 is located at the position of the groove 201. The locating pin 3 passes through the lower die 2 and the protrusion 21 and extends from the upper end of the protrusion 21. A connecting hole 41 is provided inside the mold core 4. When the mold core 4 and the protrusion 21 are connected, the locating pin 3 extends into the connecting hole 41. The locating pin 3 can play a positioning function, so that the overall structure maintains a certain angle, which is convenient for die-casting the nut rubber bowl 1.

[0030] like Figure 1 、 3 As shown in Figures 4, 5, 7, 8, and 9, the interior of the upper mold 5 is provided with a through groove 54 that is consistent with the shape of the mold core 4. The upper mold 5 is detachably connected to the mold core 4. The upper mold 5 can slide along the through groove 54 of the mold core 4 and gradually approach the lower mold 2. A support plate I 51 is provided at one end of the upper mold 5, and a card groove 52 is provided inside the upper mold 5. A ramp 43 is provided at the bottom end of the mold core 4. The ramp 43 is respectively arranged close to the side walls of the upper mold 5 and the protrusion 21. A convex plate 42 is provided at the other end of the mold core 4. First, place the upper mold 5 above the lower mold 2, and extend the mold core 4 from the through groove 54 so that the convex plate 42 of the mold core 4 abuts against the card groove 52. At this time, the support plate I 51 and the mold core 4 are parallel, and the special-shaped stopper 53 is located at the position of the groove 201.

[0031] like Figure 1 、 4 As shown in Figures 5, 6, 7, and 9, the interior of the middle mold 6 is hollow, the upper mold 5 is connected to the inside of the middle mold 6, and the upper mold 5 and the middle mold 6 are detachably connected. The center of the middle mold 6 and the lower mold 2 are aligned, and the metal shell 7 is arranged on the outside of the middle mold 6. A support plate II 61 is provided at one end of the middle mold 6. The middle mold 6 is arranged on the outside of the upper mold 5. The metal shell 7 is an annular structure. A first annular groove 71, a second groove 72, and a third groove 73 are provided inside the metal shell 7. The bottom of the metal shell 7 abuts against the lower mold 2. When the upper end of the support plate II 61 and the metal shell 7 are in contact, the plug 62 is in the position of the first groove 71, and the plug 62 is in close contact with the inner wall of the first groove 71. The position of the plug 62 is the outermost side of the nut rubber bowl 1 after die-casting. When the special-shaped stopper 53 is aligned with the groove 201, the special-shaped stopper 53 is in the position of the second groove 72. A third groove 73 is also provided inside the metal shell 7. When the upper end of the support plate II 61 and the metal shell 7 are in contact, the middle mold 6 extends into the third groove 73.

[0032] like Figure 1-9 As shown, the upper mold 5, the middle mold 6, the protrusion 21, the ramp 43 and the first groove 71 enclose a casting cavity for casting the nut rubber bowl 1. The parting surface A of the nut rubber bowl 1 is located at the junction of the ramp 43 and the protrusion 21. The traditional parting surface A is at the lip 101 in the middle of the groove 201. In this design, the parting surface A is located at the upper end of the groove 201, so that subsequent polishing will not affect the quality of the lip 101.

[0033] When installing the mold, first put the middle mold 6 on the outside of the upper mold 5, and then place the metal shell 7 on the outside of the middle mold 6, and place the metal shell 7, middle mold 6 and upper mold 5 on the lower mold 2 at the same time, and insert the mold core 4 into the upper mold 5 so that the connecting hole 41 and the positioning pin 3 are connected. At this time, the metal shell 7, middle mold 6, upper mold 5 and lower mold 2 are concentrically arranged. At this time, the inclined platform 43 of the mold core 4 is in contact with the lower mold 2, and is above the groove 201. The lip 101 is in the groove 201 position, and the parting surface A is at the connection position between the inclined platform 43 and the protrusion 21. After the die-casting is completed, the burrs on the parting surface A can be directly cleaned, which can effectively prevent the sealing lip 101 from being damaged by manual deburring, thereby affecting the sealing performance of the nut rubber bowl 1.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nut rubber bowl mold, comprising a metal shell and a mold structure, characterized in that: The mold structure includes a lower mold, a middle mold and an upper mold which are sleeved together. A protrusion is provided on the upper part of the lower mold, and a mold core is detachably provided on the protrusion. The metal shell is provided on the outside of the middle mold, and the upper mold is detachably connected to the mold core, and the upper mold is sleeved on the outside of the lower mold, and the middle mold is sleeved on the outside of the upper mold. A ramp is provided at the bottom end of the mold core, and the ramp is respectively arranged close to the side walls of the upper mold and the protrusion. The metal shell, protrusion, ramp, middle mold and upper mold enclose a casting cavity for casting the nut rubber bowl, and the parting surface of the nut rubber bowl is located at the junction of the ramp and the protrusion.

2. The nut rubber bowl mold according to claim 1, characterized in that: The lower die and the protrusion are both stepped, a groove is provided on the protrusion, and a lip is provided inside the nut rubber bowl, and the lip is located at the position of the groove.

3. The nut rubber bowl mold according to claim 1, characterized in that: A positioning pin is provided at the center of the lower mold, and a connecting hole is provided inside the mold core. When the mold core and the protrusion are connected, the positioning pin extends into the connecting hole.

4. The nut rubber bowl mold according to claim 1, characterized in that: A special-shaped stopper is provided at one end of the upper mold, a through groove with the same shape as the mold core is provided inside the upper mold, and a support plate I is provided at one end of the upper mold. When the support plate I and the mold core are parallel, the special-shaped stopper is located at the groove position.

5. The nut rubber bowl mold according to claim 4, characterized in that: One end of the middle mold is provided with a plug, the interior of the middle mold is hollow, the upper mold is connected to the inside of the middle mold, and the upper mold and the middle mold are detachably connected, and one end of the middle mold is provided with a support plate II.

6. The nut rubber bowl mold according to claim 5, characterized in that: The metal shell is an annular structure, and a first groove and a second groove are provided inside the metal shell. The bottom of the metal shell abuts against the lower mold. When the support plate II and the upper end of the metal shell abut, the plug is in the first groove position. When the special-shaped stopper is aligned with the groove, the special-shaped stopper is in the second groove position.

7. The nut rubber bowl mold according to claim 6, characterized in that: A third groove is further provided inside the metal shell. When the support plate II and the upper end of the metal shell are in contact, the middle mold extends into the third groove.

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