Commutator injection opening and straining ring switchable forming mold

Abstract

A commutator injection opening and straining ring switchable forming mold comprises a mold body, the mold body is provided with an upper mold plate, a material chamber, a straining ring cover plate, a straining ring mounting plate, a lower mold plate and a lower mold plate cover plate which are arranged from top to bottom, an inner cavity is formed in the material chamber, and the inner cavity is provided with a plurality of detachable injection opening pieces with feeding channels on the material chamber. The straining ring installation plate is provided with a detachable straining ring which is matched with the sprue piece and provided with a material passing channel, the straining ring extends into the straining ring cover plate to prevent the straining ring from being disengaged from the straining ring installation plate, the lower die plate is provided with a detachable lower pressing head which is matched with the straining ring and provided with a forming cavity, and the sprue piece, the straining ring and the lower pressing head are matched with one another. The die has the beneficial effects that the sprue piece, the straining ring and the lower pressing head are all detachable, so that the sprue piece, the straining ring and the lower pressing head can be directly replaced when being worn to a degree that the die cannot be used, and meanwhile, the size of a commutator formed by the die is not fixed, so that the application range of the die is enlarged.

Description

Technical Field

[0001] The utility model relates to the technical field of commutator processing, in particular to a forming die with switchable commutator nozzles and tightening rings. Background Art

[0002] Commutators are widely used in power tools and automotive motors. During production, upper and lower reinforcement rings are usually used to reinforce the commutator segments of the commutator, and a spring bushing is set on the inside of the bakelite powder body of the commutator to improve the mechanical strength and overspeed performance of the commutator.

[0003] Publication No. CN208970910U discloses a processing mold for a commutator, including a base plate, a square block is arranged at the upper end of the base plate, a fixed block is welded at the upper end of the base plate..., a second spring is connected to the upper end of the lower rubber pad, and an upper end of the second spring is connected to the upper rubber pad. This mold is used for the production of commutators, but has defects, that is, both the pouring port formed in the upper mold and the commutator groove formed in the lower mold are directly formed on the upper mold or the lower mold, and both the pouring port and the commutator groove of the mold will be worn due to use during the production process, and when the mold is worn to the extent that it cannot be used, it will cause the mold to be scrapped, thereby increasing the cost. At the same time, the direct molding method also causes the size of the commutator formed by this set of molds to be fixed, thereby limiting its scope of application, and thus it is necessary to add multiple sets of molds to support production needs. Utility Model Content

[0004] The utility model aims to solve the above-mentioned shortcomings of the prior art and provides a molding die with switchable commutator nozzle and tightening ring to solve the above-mentioned problems.

[0005] The utility model adopts a technical solution to solve its technical problems: the forming mold with switchable commutator nozzle and tightening ring comprises a mold body, the mold body comprises an upper mold plate, a material chamber, a tightening ring cover plate, a tightening ring mounting plate, a lower mold plate and a lower mold plate cover plate which are arranged from top to bottom, an inner cavity is arranged in the material chamber, a plurality of detachable nozzle parts with feeding channels are arranged on the material chamber, a tightening ring which matches the nozzle part and is detachable and has a material passing channel is arranged on the tightening ring mounting plate, the tightening ring extends into the tightening ring cover plate to prevent the tightening ring from escaping from the tightening ring mounting plate, a lower pressure head which matches the tightening ring and is detachable and has a forming cavity is arranged on the lower mold plate, and the nozzle part, the tightening ring and the lower pressure head cooperate with each other.

[0006] For further improvement, the inner cavity is provided with a first countersunk hole on the material chamber for the nozzle piece to be inserted, and the nozzle piece has an integrally formed narrow section and a wide section to adapt to the configuration of the first countersunk hole, and the first countersunk hole and the nozzle piece fit tightly.

[0007] For further improvement, the narrow section of the nozzle piece is provided with a circle of inwardly recessed tool withdrawal groove at the connection between it and the wide section, and a back-stop clamp ring is connected in the tool withdrawal groove, and the back-stop clamp ring is clamped in the small-diameter hole of the first countersunk hole.

[0008] For further improvement, a second countersunk hole for the tight ring to be inserted is provided on the tight ring mounting plate, the tight ring has an integrally formed narrow section and a wide section to adapt to the configuration of the second countersunk hole, and an extension hole for the tight ring to be inserted is provided on the tight ring cover plate, the extension hole cooperates with the second countersunk hole to form an anti-detachment structure for preventing the tight ring from detaching from the tight ring mounting plate.

[0009] Further improvement, the inner diameter of the extension hole is consistent with the size of the small diameter section of the second countersunk hole, and both are smaller than the size of the large diameter section of the second countersunk hole.

[0010] For further improvement, a third countersunk hole is provided on the lower template for inserting the lower pressure head, and the lower pressure head has an integrally formed narrow section, a wide section, and a cavity section. The narrow section and the wide section of the lower pressure head are adapted to the configuration of the third countersunk hole, and the cavity section extends into the material transfer channel of the tight ring.

[0011] The beneficial effects of the utility model are:

[0012] The nozzle piece, the tightening ring, and the lower pressure head of the utility model are all detachable, so they can be directly replaced when they are worn to the point where they cannot be used, thereby reducing costs. At the same time, the replaceable manner makes the size of the commutator formed by the set of molds not fixed, thereby increasing the application range of the mold and eliminating the need to increase molds to support production needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the full cross-section structure of the utility model;

[0015] Figure 3 For this utility model Figure 2 A partial enlarged schematic diagram of part A. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings:

[0017] Referring to the accompanying drawings: This commutator molding die with switchable nozzles and tightening rings comprises a mold body 1, the mold body 1 having an upper mold plate 11, a material chamber 12, a tightening ring cover plate 13, a tightening ring mounting plate 14, a lower mold plate 15, and a lower mold plate cover plate 16 arranged from top to bottom, an inner cavity 12-a is arranged in the material chamber 12, and the inner cavity 12-a is provided with a plurality of detachable nozzle parts 2 with feed channels 21 on the material chamber 12, a tightening ring 3 matching the nozzle part 2 and detachable and having a material passing channel 31 is arranged on the tightening ring mounting plate 14, the tightening ring 3 extends into the tightening ring cover plate 13 to prevent the tightening ring 3 from escaping from the tightening ring mounting plate 14, a lower pressure head 4 matching the tightening ring 3 and detachable and having a molding cavity 41 is arranged on the lower mold plate 15, and the nozzle part 2, the tightening ring 3, and the lower pressure head 4 cooperate with each other. The principle of the utility model is that the nozzle piece 2, the tight ring 3, and the lower pressure head 4 are all detachable, so that they can be directly replaced when they are worn to the extent that they cannot be used, thereby reducing costs. At the same time, the replaceable manner makes the size of the commutator formed by the set of molds not fixed, thereby increasing the application range of the mold, and there is no need to increase the mold to support production needs, and only the nozzle piece 2, the tight ring 3, and the lower pressure head 4 of the required size need to be replaced. In this embodiment, the nozzle piece 2 is located at the upper end of the tight ring 3 and is used to close the upper opening of the tight ring 3, and the lower pressure head 4 is located at the lower end of the tight ring 3 and is used to close the lower opening of the tight ring 3, and part of the lower pressure head 4 is inserted into the material transfer channel 31 of the tight ring 3, so as to form a closed cavity for forming the commutator.

[0018] The inner cavity 12-a is provided with a first countersunk hole 12-a1 on the material chamber 12 for the nozzle piece 2 to be inserted. The nozzle piece 2 has an integrally formed narrow section and a wide section to adapt to the configuration of the first countersunk hole 12-a1. The first countersunk hole 12-a1 and the nozzle piece 2 are tightly matched. The first countersunk hole 12-a1 is composed of two inner holes with different inner diameters. The configuration of the nozzle piece 2 matches the configuration of the first countersunk hole 12-a1, so that when the nozzle piece 2 is placed in the first countersunk hole 12-a1, its final assembly position in the material chamber 12 can be quickly limited, and the requirement of the upper opening of the material transfer channel 31 of the closed tight ring 3 can also be met, thereby avoiding the leakage of the material injected by the nozzle piece 2, and the close fit between the nozzle piece 2 and the first countersunk hole 12-a1 can increase the installation stability, so that the assistance of auxiliary tools (i.e., rubber hammer, etc.) is required during the installation or disassembly process.

[0019] The narrow section of the injection nozzle 2 is provided with a circle of inwardly recessed tool withdrawal groove 22 at the connection between it and the wide section, and a back-moving clamp ring 5 is connected to the back-moving groove 22. The back-moving clamp ring 5 is clamped in the small-diameter hole of the first countersunk hole 12-a1. The outer diameter of the tool withdrawal groove 22 is smaller than the outer diameter of the injection nozzle 2, thereby providing an installation area for the back-moving clamp ring 5, and the outer diameter of the back-moving clamp ring 5 is slightly larger than the inner diameter of the narrow section of the first countersunk hole 12-a1, so that a firm clamping effect can be produced after entering, and an interference fit can be achieved, thereby preventing the injection nozzle 2 from withdrawing from the first countersunk hole 12-a1.

[0020] A second countersunk hole 14-a for inserting the tightening ring 3 is provided on the tightening ring mounting plate 14. The tightening ring 3 has an integrally formed narrow section and a wide section to adapt to the configuration of the second countersunk hole 14-a. An extension hole 13-a for inserting the tightening ring 3 is provided on the tightening ring cover plate 13. The extension hole 13-a cooperates with the second countersunk hole 14-a to form an anti-detachment structure for preventing the tightening ring 3 from detaching from the tightening ring mounting plate 14. The second countersunk hole 14-a is composed of an inner hole with different inner diameters at both ends. The configuration of the tightening ring 3 matches the configuration of the second countersunk hole 14-a. In this way, the second countersunk hole 14-a can quickly limit the final assembly position of the tightening ring 3 on the tightening ring mounting plate 14 when the tightening ring 3 is placed therein, and prevent the tightening ring 3 from detaching from the second countersunk hole 14-a through the tightening ring cover plate 13. The extension hole 13-a enables the tightening ring 3 to pass through the tightening ring cover plate 13 and cooperate with the injection port 2.

[0021] The inner diameter of the extension hole 13-a is consistent with the size of the small diameter section of the second countersunk hole 14-a, and both are smaller than the size of the large diameter section of the second countersunk hole 14-a. Such a setting can simplify the configuration of the tightening ring 3, that is, the tightening ring 3 is composed of only two sections of outer diameter, so that it can be quickly formed during processing.

[0022] A third countersunk hole 15-a is provided on the lower template 15 for the lower punch 4 to be inserted into. The lower punch 4 has an integrally formed narrow section, a wide section, and a cavity section. The narrow section and the wide section of the lower punch 4 are adapted to the configuration of the third countersunk hole 15-a. The cavity section extends into the transfer channel 31 of the tightening ring 3. The third countersunk hole 15-a is composed of two inner holes with different inner diameters. The configuration of the lower punch 4 matches the configuration of the third countersunk hole 15-a. In this way, the third countersunk hole 15-a can quickly limit the final assembly position of the lower punch 4 on the lower template 15 when the lower punch 4 is placed therein, and the lower punch 4 is prevented from being separated from the third countersunk hole 15-a by the lower template cover plate 16. At the same time, the outer diameter of the narrow part of the lower punch 4 is smaller than the outer diameter of the narrow part of the tightening ring 3, thereby meeting the requirement of closing the lower opening of the transfer channel 31 of the tightening ring 3.

[0023] Although the present invention has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein within the scope of the claims.

Claims

1. A commutator molding die with switchable nozzle and clamping ring, comprising a die body (1), characterized in that: The mold body (1) comprises an upper mold plate (11), a material chamber (12), a tightening ring cover plate (13), a tightening ring mounting plate (14), a lower mold plate (15), and a lower mold plate cover plate (16) arranged from top to bottom. The material chamber (12) is provided with an inner cavity (12-a). The inner cavity (12-a) is provided with a plurality of detachable nozzles (2) having a feed channel (21) on the material chamber (12). The tightening ring mounting plate (14) is provided with a The nozzle piece (2) is matched with a detachable tightening ring (3) having a material transfer channel (31); the tightening ring (3) extends into the tightening ring cover plate (13) to prevent the tightening ring (3) from escaping from the tightening ring mounting plate (14); a lower pressure head (4) is provided on the lower mold plate (15) which is matched with the tightening ring (3) and detachable and has a molding cavity (41); the nozzle piece (2), the tightening ring (3), and the lower pressure head (4) cooperate with each other.

2. The molding die with switchable commutator nozzle and clamp ring according to claim 1, characterized in that: The inner cavity (12-a) is provided with a first countersunk hole (12-a1) on the material chamber (12) for the nozzle piece (2) to be inserted into, and the nozzle piece (2) has an integrally formed narrow section and a wide section to adapt to the configuration of the first countersunk hole (12-a1), and the first countersunk hole (12-a1) and the nozzle piece (2) are tightly matched.

3. The molding die with switchable commutator nozzle and clamp ring according to claim 2, characterized in that: A circle of inwardly recessed tool withdrawal groove (22) is provided at the connection between the narrow section of the nozzle piece (2) and the wide section, and a retaining ring (5) is connected inside the tool withdrawal groove (22), and the retaining ring (5) is retained in the small-diameter hole of the first countersunk hole (12-a1).

4. The molding die with switchable commutator nozzle and clamp ring according to claim 1, characterized in that: The tightening ring mounting plate (14) is provided with a second countersunk hole (14-a) for the tightening ring (3) to be inserted into, the tightening ring (3) has an integrally formed narrow section and a wide section to adapt to the configuration of the second countersunk hole (14-a), and the tightening ring cover plate (13) is provided with an extension hole (13-a) for the tightening ring (3) to be inserted into, and the extension hole (13-a) cooperates with the second countersunk hole (14-a) to form an anti-detachment structure for preventing the tightening ring (3) from detaching from the tightening ring mounting plate (14).

5. The molding die with switchable commutator nozzle and clamp ring according to claim 4, characterized in that: The inner diameter of the extension hole (13-a) is consistent with the size of the small diameter section of the second countersunk hole (14-a), and is smaller than the size of the large diameter section of the second countersunk hole (14-a).

6. The molding die with switchable commutator nozzle and clamp ring according to claim 1, characterized in that: The lower template (15) is provided with a third countersunk hole (15-a) for the lower punch (4) to be inserted therein, and the lower punch (4) has an integrally formed narrow section, a wide section, and a cavity section, the narrow section and the wide section of the lower punch (4) being adapted to the configuration of the third countersunk hole (15-a), and the cavity section extending into the transfer channel (31) of the tightening ring (3).

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