CN217098637U - Rear mold and mold - Google Patents

Abstract

The embodiment of the utility model discloses back mould and mould relates to the technical field of moulding plastics. The rear mold includes oppositely disposed supports. This support piece is equipped with the recess, two the recess one-to-one corresponds two tip of metal rotating shaft to with the metal rotating shaft location, support piece is equipped with the first magnetism piece of inhaling of magnetic adsorption tip. The back mould is provided with a second magnetic attraction piece between the two support pieces. The second magnetism is inhaled the piece and can be increased the relative metal pivot magnetic adsorption's of mould area, so inhale the axial distribution of piece along the metal pivot and produce magnetic adsorption's combined action through first magnetism and second magnetism, can be fixed in the tip in the recess to prevent that the metal pivot from taking place the drunkenness and shifting and dislocation at the in-process of moulding plastics, avoid crushing the mould, and then promote the yield of injection molding.

Description

Rear mold and mold

Technical Field

The utility model relates to a technical field that moulds plastics especially relates to a back mould and mould.

Background

The injection molding with metal pivot passes through the metal pivot and is connected body and rotator, and only narrow and small space exposure in the both sides of metal pivot is located between body and the rotator and is contacted with the mould. Therefore, when an injection molding piece with a metal rotating shaft is subjected to injection molding at present, the problem of fixing the metal rotating shaft needs to be overcome, and the metal rotating shaft is ensured to be firmly positioned; but also ensures accurate positioning. The rear mold in the existing mold plays a main fastening and positioning role for the metal rotating shaft, but the existing rear mold is poor in fastening and positioning for the metal rotating shaft, so that shifting and dislocation are easy to occur in the injection molding process, and the mold is easy to crush to influence production.

SUMMERY OF THE UTILITY MODEL

Based on this, it is necessary to provide a rear mold and a mold, and the purpose is to solve the technical problem that when an injection molding part with a metal rotating shaft is injected by the existing mold, the metal rotating shaft is fastened and positioned poorly.

In order to solve the technical problem, the utility model discloses a technical scheme one is:

the utility model provides a rear mould, is equipped with the first groove of moulding plastics, rear mould includes the support piece of two relative settings, support piece accept in the first groove of moulding plastics, support piece is equipped with the recess, two tip of recess one-to-one metal pivot is in order to be located the metal pivot the first groove of moulding plastics, support piece is equipped with first magnetism and inhales the piece, first magnetism is inhaled the piece and is used for magnetic adsorption the tip, rear mould is equipped with second magnetism and inhales the piece, the second magnetism is inhaled the piece and is located two between the support piece, the second magnetism is inhaled the piece and is used for magnetic adsorption the metal pivot, in order to cooperate first magnetism inhale the piece will the tip is fixed in the recess.

In some embodiments of the rear mold, the magnetic field directions of the first magnetic attracting member and the second magnetic attracting member are perpendicular to the axial direction of the metal rotating shaft.

In some embodiments of the rear mold, the first magnetic part includes a first magnetic part disposed near the groove, and the first magnetic part is cylindrical and extends in a direction perpendicular to the axial direction.

In some embodiments of the rear mold, the supporting member has a through hole, the through hole penetrates through the supporting member along a direction perpendicular to the axial direction, the first magnetic attraction member is accommodated in the through hole, the first magnetic attraction portion includes a first end close to the groove, the first end and a hole wall of the through hole are defined to form a sinking groove, and the sinking groove is exposed in the groove.

In some embodiments of the rear mold, the first magnetic attraction piece further includes a second magnetic attraction portion, a shaft shoulder is formed between the first magnetic attraction portion and the second magnetic attraction portion, a stopping portion is disposed on the support member, and the mold further includes a plug, the plug is used for sealing the through hole and can drive the first magnetic attraction piece to move towards the groove, so that the shaft shoulder abuts against the stopping portion.

In some embodiments of the rear mold, the mold is used for injection molding of an injection molding part with a metal rotating shaft, the injection molding part comprises a body, a rotating body and the metal rotating shaft, the body and the rotating body are connected in a rotating mode through the metal rotating shaft, the supporting piece extends into the space between the body and the rotating body, so that the groove bottom of the groove is attached to the end portion, and the first magnetic suction pieces are multiple in number and distributed around the axial direction.

In some embodiments of the rear mold, the rear mold further includes a demolding part, the demolding part is used for separating the injection molding part from the rear mold, the second magnetic attraction is arranged on the demolding part, and a space included angle is formed between a resultant force direction of each first magnetic attraction and a direction in which the demolding part drives the injection molding part.

In some embodiments of the posterior mold, the second magnetically attractive element extends parallel to the axial direction.

In some embodiments of the mold, the rear mold includes two positioning members disposed oppositely, the positioning members are accommodated in the first injection molding groove, and each of the positioning members corresponds to each of the end portions in the axial direction.

In order to solve the technical problem, the utility model discloses a technical scheme two be:

a mold comprising a back mold as described above, and

the front mould is provided with a second injection molding groove, and the first injection molding groove and the second injection molding groove are oppositely arranged and are surrounded to form an injection molding cavity.

Implement the embodiment of the utility model provides a, will have following beneficial effect:

the rear mould of above-mentioned scheme is used and is equipped in the mould, except making the mould possess splendid efficiency of moulding plastics to the injection molding that has the metal pivot, and its self can also play fastening and positioning action to the metal pivot. In particular, the rear mold comprises oppositely disposed supports. This support piece is equipped with the recess, two the recess one-to-one corresponds two tip of metal rotating shaft to with the metal rotating shaft location, support piece is equipped with the first magnetism piece of inhaling of magnetic adsorption tip. The back mould is provided with a second magnetic attraction piece between the two support pieces. The second magnetism is inhaled the piece and can be increased the relative metal pivot magnetic adsorption's of mould area, so inhale the axial distribution of piece along the metal pivot and produce magnetic adsorption's combined action through first magnetism and second magnetism, can be fixed in the tip in the recess to prevent that the metal pivot from taking place the drunkenness and shifting and dislocation at the in-process of moulding plastics, avoid crushing the mould, and then promote the yield of injection molding.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Wherein:

FIG. 1 is a schematic diagram of an exploded structure of a mold in one embodiment;

FIG. 2 is an enlarged view of the portion A of the mold shown in FIG. 1;

FIG. 3 is a schematic view of the assembly of the rear mold and the metal rotating shaft in the mold shown in FIG. 1;

FIG. 4 is a sectional view taken along line B-B of FIG. 3;

FIG. 5 is an enlarged view of the portion D in FIG. 4;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 3;

FIG. 7 is an enlarged view of section E of FIG. 6;

FIG. 8 is an enlarged view of the portion F of FIG. 7;

FIG. 9 is an axial view of a first magnetically attractive element of the mold of FIG. 1;

FIG. 10 is a schematic view of a front mold of the mold shown in FIG. 1;

FIG. 11 is an enlarged view of the portion G of FIG. 10;

FIG. 12 is a schematic view of the assembly of the back mold and the injection molded part of the mold of FIG. 1;

FIG. 13 is a sectional view taken along line H-H in FIG. 12;

FIG. 14 is an enlarged view of the portion I of FIG. 13;

fig. 15 is a partial schematic view of an injection-molded article in this embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The mold provided by the embodiment of the utility model is used for injection molding of injection molding parts, in particular to injection molding of injection molding parts with metal rotating shafts; of course, in other embodiments of the present invention, the mold can also be used for injection molding of other injection molded parts with metal parts, or other processing procedures of other injection molded parts, and is not limited herein.

Referring to fig. 1 to 3, 5, 7 and 15, a mold provided by the present mold will now be described. The mold includes a rear mold 10 and a front mold 20. Wherein the rear mold 10 is provided with a first injection molding groove 11. The rear mold 10 includes two oppositely disposed supports 12. The support member 12 is received in the first injection groove 11. The support 12 is provided with a groove 121. The two grooves 121 correspond to the two ends 311 of the metal rotating shaft 31 one by one, so as to position the metal rotating shaft 31 in the first injection molding groove 11. The support member 12 is provided with a first magnetic attraction member 13. The first magnetic part 13 is used for magnetically attracting the end part 311. The rear mold 10 is provided with a second magnetic attraction 14. The second magnetically attractive element 14 is located between the two support members 12. The second magnetic element 14 is used for magnetically attracting the metal shaft 31 to cooperate with the first magnetic element 13 to fix the end 311 in the groove 121. As shown in fig. 10 and 11, the front mold 20 is provided with a second injection groove 21. The first injection molding groove 11 and the second injection molding groove 21 are oppositely arranged and surround to form an injection molding cavity.

To sum up, implement the embodiment of the utility model provides a, will have following beneficial effect: the rear mold 10 of the above scheme is applied to a mold, and besides enabling the mold to have excellent injection molding efficiency for an injection molding part with the metal rotating shaft 31, the mold can also perform fastening and positioning functions on the metal rotating shaft 31. Specifically, the rear mold 10 includes oppositely disposed supports 12. The supporting member 12 is provided with two grooves 121, the two grooves 121 correspond to the two end portions 311 of the metal rotating shaft 31 one by one to position the metal rotating shaft 31, and the supporting member 12 is provided with a first magnetic attraction member 13 for magnetically attracting the end portions 311. The rear mold 10 is provided with a second magnetic attraction 14 between the two supports 12. The second magnetism is inhaled piece 14 and can be increased the relative metal rotating shaft 31 magnetic adsorption's of mould area, so inhale piece 13 and second magnetism and inhale 14 along the axial distribution of metal rotating shaft 31 and produce magnetic adsorption's combined action through first magnetism, can be fixed in recess 121 with tip 311 in to prevent that metal rotating shaft 31 from taking place the drunkenness and shifting and the dislocation at the in-process of moulding plastics, avoid crushing the mould, and then promote the yield of injection molding.

In one embodiment, as shown in fig. 4 to 7, the magnetic field directions of the first magnetic attracting element 13 and the second magnetic attracting element 14 are perpendicular to the axial direction of the metal rotating shaft 31. This ensures that the metal shaft 31 is relatively stable in the magnetic field formed by the first magnetic element 13 and the second magnetic element 14. The magnetic force applied to the metal rotating shaft 31 is large and vertical to the axial direction, so that the metal rotating shaft 31 is prevented from moving to the position with the maximum magnetic field intensity and being separated from the groove 121. In this embodiment, the end portion 311 is at least partially received in the recess 121, and the portion is at least partially cylindrical. Therefore, in the present embodiment, the cross section of the groove 121 is semicircular to fit the cylindrical surface. The aforementioned magnetic field direction points to the center of the groove 121 in the radial direction thereof. It should be understood that in other embodiments, the portion of the end portion 311 received in the groove 121 may have other shapes, and the corresponding cross-sectional shape of the groove 121 may match the shape of the portion, so as to improve the stability of positioning the metal rotating shaft 31 in the first injection groove 11. In addition, a shoulder may be provided on the metal shaft 31 to provide the end 311 with a radial dimension variation. The shaft shoulder may cooperate with the support 12 to prevent axial play of the metallic shaft 31.

In one embodiment, as shown in fig. 7 and 9, the first magnetic member 13 includes a first magnetic portion 131. The first magnetic attraction portion 131 is disposed adjacent to the groove 121. The first magnetic attraction portion 131 is cylindrical and extends in a direction perpendicular to the axial direction. The first magnetic attraction portion 131 is cylindrical, so that the magnetic force generated by the first magnetic attraction portion acting on the end portion 311 is more uniform, and the stability of the end portion 311 accommodated in the groove 121 is further improved.

In one embodiment, as shown in fig. 7 to 9, the support 12 is provided with a through hole 122, and the through hole 122 penetrates the support 12 in a direction perpendicular to the axial direction. The first magnetic member 13 is received in the through hole 122. The first magnetic attraction member 13 can move to the recess 121 side by the guiding action of the through hole 122. Further, the first magnetic attraction 131 includes a first end 1311 near the groove 121. The first end 1311 and the wall of the through hole 122 are surrounded to form a sinking groove 123, and the sinking groove 123 is exposed in the groove 121. Because the first end 1311 and the hole wall enclose the groove 121, it can be ensured that the first magnetic attraction piece 13 is located in the through hole 122 and does not have a portion located in the groove 121, thereby avoiding the first magnetic attraction piece 13 from wearing the metal rotating shaft 31 during the assembly of the metal rotating shaft 31 and the subsequent injection molding and demolding processes. The depth of the sinking groove 123 is as shallow as possible to shorten the distance between the first end 1311 and the metal rotating shaft 31 as much as possible.

In one embodiment, as shown in fig. 7 to 9, the first magnetic part 13 further includes a second magnetic part 132, and a shoulder 133 is formed between the first magnetic part 131 and the second magnetic part 132. A stop is provided on the support 12. The mold further comprises a plug 40, wherein the plug 40 is used for sealing the through hole 122 and driving the first magnetic element 13 to move towards the groove 121, so that the shoulder 133 abuts against the stopper. Therefore, the first magnetic attraction piece 13 can be moved to a preset position for positioning through the matching of the shoulder 133 and the stop portion, so as to ensure that the magnetic force of the first magnetic attraction piece 13 acting on the metal rotating shaft 31 reaches the expectation and prevent the first end 1311 from extending into the groove 121 to contact with the metal rotating shaft 31 and scratching the metal rotating shaft. The plug 40 is provided to prevent fluid generated during injection, for example, molten injection molding material or high-temperature gas generated during injection, from entering the control portion inside the mold and damaging the control portion. In this embodiment, the plug 40 is a copper plug 40. Which is detachably connected with the supporting member 12 so as to conveniently adjust the position of the first magnetic attraction piece 13 located in the through hole 122, and magnetize and replace the first magnetic attraction piece 13 when the magnetic force thereof is weakened or damaged.

In one embodiment, as shown in fig. 9, the second magnetic part 132 is provided with a first guiding portion, the supporting member 12 is provided with a second guiding portion, the second guiding portion is received in the through hole 122, and the first guiding portion and the second guiding surface cooperate to enable the first magnetic part 13 to move relative to the supporting member 12 along the direction perpendicular to the axial direction. In this embodiment, the first guiding portion is an outer wall of the second magnetic attracting portion 132. And the second guide portion is located on the wall of the through hole 122. The first guiding part and the second guiding part are both cylindrical surfaces and matched, so that the first magnetic attraction piece 13 can move relative to the support piece 12. It is understood that in other embodiments, the second magnetic attraction portion 132 may also be a prism structure, the first guiding portion is formed by intersecting adjacent outer walls, and likewise, the cross section of the second guiding portion matches with the prism structure. Therefore, the first magnetic part 13 can move relative to the support part 12 conveniently through the matching of the first guide part and the second guide part. Meanwhile, due to the prismatic structures of the first guide part and the second guide part, the first magnetic attraction piece 13 can be prevented from rotating relative to the support piece 12, and the assembling stability of the first magnetic attraction piece 13 and the support piece 12 is further improved.

In one embodiment, as shown in fig. 7, 9 and 12 to 14, the mold is used for injection molding of an injection molded part with a metal rotating shaft 31, the injection molded part comprises a body 32, a rotating body 33 and the metal rotating shaft 31, the body 32 and the rotating body 33 are rotatably connected through the metal rotating shaft 31, the supporting part 12 extends between the body 32 and the rotating body 33 so that the groove bottom of the groove 121 is attached to the end part 311, and the number of the first magnetic attraction parts 13 is multiple and distributed around the axial direction. Since the gap 34 between the body 32 and the rotating body 33 is small, only a narrow space of the metal rotating shaft 31 is exposed between the body 32 and the rotating body 33. Therefore, the support member 12 can be provided relatively thin to be able to extend between the body 32 and the rotator 33. The number of the first magnetic parts 13 is plural, and the magnetic areas of the opposite ends 311 of the mold can be increased by distributing the first magnetic parts around the axial direction, so as to ensure that the metal rotating shaft 31 can be stably accommodated in the first injection molding groove 11 under the condition of a smaller size of the supporting part 12. In this embodiment, the first magnetic element 13 includes a first magnetic portion 131 and a second magnetic portion 132. The first magnetic portion 131 and the second magnetic portion 132 are both cylindrical and have smaller size, so as to reduce the difficulty of forming the through hole 122 on the supporting member 12. Meanwhile, the smaller sizes of the first magnetic attraction part 131 and the second magnetic attraction part 132 enable the through hole 122 to have a limited attenuation on the strength of the support 12, so that the support 12 still has a higher strength to avoid breaking during the assembly process of the metal rotating shaft 31 and during the injection molding and demolding process. As shown in fig. 6 and 7. The rear mold 10 further includes a first body 15 and an adjustment mechanism 16. The adjusting mechanism 16 can adjust the position of the supporting member 12 relative to the first body 15 to ensure the stability of the supporting member 12 supporting the metal rotating shaft 31. Meanwhile, during demolding, the support part 12 is driven by the adjusting mechanism 16 to assist in completing demolding of the injection-molded part. Further, a guide hole is formed on the first body 15, and the adjusting mechanism 16 can drive the supporting member 12 to move along the guide hole relative to the first body 15 so as to adjust the position of the supporting member 12. With a guide 17 between the adjustment mechanism 16 and the support 12. The support 12 and the adjustment mechanism 16 are each provided with a slot for receiving the support 12. The guide member 17 and the guiding hole act together to further improve the moving precision of the support member 12, and ensure the stability of the magnetic adsorption of the first magnetic attraction member 13 on the metal rotating shaft 31.

In one embodiment, as shown in fig. 2, 4, 5 and 7, the rear mold 10 further comprises a demolding part 18, the demolding part 18 is used for detaching the injection molded part from the rear mold 10, and the second magnetic attracting part 14 is arranged on the demolding part 18, so that the second magnetic attracting part 14 can make the injection molded part fit to the demolding part 18 more stably by generating attraction force on the metal rotating shaft 31 during demolding, and demolding of the injection molded part is facilitated and controlled stably. Furthermore, a certain spatial included angle is formed between the resultant force direction of each first magnetic part 13 and the direction of the injection molding part driven by the demolding part 18. Because a certain spatial included angle is formed between the resultant force direction of each first magnetic attraction piece 13 and the direction of the demoulding piece 18 for driving the injection molding piece, the resultant force of each first magnetic attraction piece 13 can provide a lateral force in the demoulding process, and the injection molding piece is convenient to be separated from a mold relative to the outer surface which is parallel to the driving direction of the demoulding piece 18 or has a small included angle with the driving direction of the demoulding piece 18. When the end 311 is far away from the groove 121, the suction force of the first magnetic part 13 to the end 311 is reduced, and meanwhile, the suction force generated by the second magnetic part 14 can also prevent the injection molding part from falling off from the demolding part 18. Finally, the injection-molded part is demolded under the drive of the demolding element 18. In the present exemplary embodiment, the stripping element 18 is driven by a lifting mechanism in order to drive the injection-molded part.

In one embodiment, as shown in fig. 2, 4 and 5, the second magnetic element 14 extends in a direction parallel to the axial direction. Therefore, the magnetic attraction area of the second magnetic attraction piece 14 relative to the metal rotating shaft 31 can be increased, and the attraction force of the second magnetic attraction piece 14 to the metal rotating shaft 31 can be increased so as to cooperate with the first magnetic attraction piece 13 to fix the end part 311 in the groove 121. The stripping element 18 is provided with a through slot which extends through the stripping element 18 in a direction parallel to the axial direction. The second magnetic element 14 is complementary to the through slot, so that the second magnetic element 14 is ensured not to interfere with the movement of the demolding part 18 while the volume of the second magnetic element 14 is increased as much as possible and the magnetic field intensity thereof is increased.

In one embodiment, as shown in fig. 2 and 5, the rear mold 10 includes two positioning members 19 disposed opposite to each other, the positioning members 19 are received in the first injection molding groove 11, and each positioning member 19 is axially opposite to each end portion 311 in a one-to-one correspondence. Thus, the positioning member 19 can roughly position the metal rotating shaft 31, and the first magnetic attraction member 13 and the second magnetic attraction member 14 can be matched to position the metal rotating shaft 31 in the first injection molding groove 11. Meanwhile, the first magnetic attraction piece 13 and the second magnetic attraction piece 14 can generate a magnetic force on the metal rotating shaft 31 to fasten the end portion 311 in the groove 121.

In one embodiment, as shown in fig. 11, the front mold 20 includes two oppositely disposed clips 22, the clips 22 are accommodated in the second injection molding groove 21, and the clips 22 can abut the end 311 against the bottom of the groove 121. Therefore, the metal rotating shaft 31 can be further fastened, and the metal rotating shaft is prevented from moving, shifting and misplacing during assembly and injection molding. Further, a card slot 221 is provided on the card member 22. The engaging groove 221 is matched with the end portion 311 to further improve the connection stability between the metal rotating shaft 31 and the mold.

In this embodiment, the first magnetic attraction piece 13 and the second magnetic attraction piece 14 are both permanent magnets. It is understood that in other embodiments, at least one of the first magnetic attraction member 13 and the second magnetic attraction member 14 may also be an electromagnet, and the magnitude of the magnetic field is controlled by current to conveniently control the attraction force on the metal rotation shaft 31, for example, the magnetic field may be reduced before the metal rotation shaft 31 is assembled, and the magnetic field may be increased after the positioning member 19 is roughly positioned. It is also possible to increase the magnetic field strength during the injection molding process to fasten the metal shaft 31.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the mold, and it is needless to say that the scope of the mold is not limited by the above description, and therefore, the mold is covered by the scope of the mold according to the claims.

Claims (10)

1. The utility model provides a rear mould, its characterized in that is equipped with the first groove of moulding plastics, rear mould includes the support piece of two relative settings, support piece accept in the first groove of moulding plastics, support piece is equipped with the recess, two tip of recess one-to-one metal pivot are in order to be located the metal pivot the first groove of moulding plastics, support piece is equipped with first magnetism and inhales the piece, first magnetism is inhaled the piece and is used for magnetic adsorption the tip, rear mould is equipped with second magnetism and inhales the piece, second magnetism is inhaled the piece and is located two between the support piece, second magnetism is inhaled the piece and is used for magnetic adsorption the metal pivot is in order to cooperate first magnetism is inhaled the piece will the tip is fixed in the recess.

2. The rear mold as claimed in claim 1, wherein the magnetic field direction of the first magnetic member and the second magnetic member is perpendicular to the axial direction of the metal shaft.

3. The back mold of claim 2, wherein the first magnetic element comprises a first magnetic portion disposed adjacent to the recess, the first magnetic portion being cylindrical and extending in an axial direction perpendicular to the metal shaft.

4. The rear mold as claimed in claim 3, wherein the supporting member has a through hole, the through hole penetrates the supporting member along a direction perpendicular to the axial direction, the first magnetic attraction member is received in the through hole, the first magnetic attraction member includes a first end close to the groove, the first end and a wall of the through hole are defined to form a sinking groove, and the sinking groove is exposed in the groove.

5. The back mold according to claim 4, wherein the first magnetic element further comprises a second magnetic element, a shoulder is formed between the first magnetic element and the second magnetic element, the supporting element is provided with a stop portion, and the back mold further comprises a plug for sealing the through hole and driving the first magnetic element to move towards the groove, so that the shoulder abuts against the stop portion.

6. The rear mold according to claim 2, wherein the rear mold is used for injection molding of an injection molding part with a metal rotating shaft, the injection molding part comprises a body, a rotating body and a metal rotating shaft, the body and the rotating body are rotatably connected through the metal rotating shaft, the supporting piece extends between the body and the rotating body so as to enable the groove bottom of the groove to be attached to the end portion, and the first magnetic attraction pieces are multiple in number and distributed axially around the metal rotating shaft.

7. The back mold of claim 6, further comprising a demolding part for detaching the injection molding part from the back mold, wherein the second magnetic attraction is arranged on the demolding part, and a space included angle is formed between the resultant force direction of the first magnetic attraction and the direction of the demolding part driving the injection molding part.

8. The posterior mould according to claim 2, wherein the second magnetically attractive element extends in an axial direction parallel to the metal shaft.

9. The rear mold as claimed in claim 1, wherein the rear mold comprises two positioning members disposed oppositely, the positioning members are received in the first injection molding groove, and each positioning member corresponds to each end portion along the axial direction of the metal rotating shaft.

10. A mold comprising a rear mold according to any one of claims 1 to 9, and

the front mould is provided with a second injection molding groove, and the first injection molding groove and the second injection molding groove are oppositely arranged and are surrounded to form an injection molding cavity.

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