CN210705750U - Gear forming die - Google Patents
Gear forming die Download PDFInfo
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- CN210705750U CN210705750U CN201921114988.9U CN201921114988U CN210705750U CN 210705750 U CN210705750 U CN 210705750U CN 201921114988 U CN201921114988 U CN 201921114988U CN 210705750 U CN210705750 U CN 210705750U
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Abstract
The utility model discloses a gear forming die, wherein a tooth-shaped die core is sleeved outside a tooth-hub die core, the upper part of the tooth-shaped die core, the upper end of the tooth-hub die core and a pore-forming part enclose a cavity for forming a gear, and the height of the cavity is matched with the thickness of the gear; the thickness of the tooth-shaped mold core is more than one-half and more than five times larger than that of the gear, and a supporting piece used for lifting the tooth-shaped mold core is arranged between the tooth-shaped mold core and the lower die seat. And liquid plastic is injected into the cavity from the upper die base, when the tooth-shaped die core in the cavity is worn, the tooth-shaped die core is taken out, the worn part of the tooth-shaped die core is removed, the supporting piece is placed into the lower die base and then the tooth-shaped die core is placed, the supporting piece lifts the tooth-shaped die core, the unworn part of the tooth-shaped die core is leaked out, and the tooth-shaped die core, the tooth-shaped hub die core and the pore-forming piece enclose the cavity. And when the tooth-shaped mold core is abraded again, the supporting piece is added on the basis of the original supporting piece, and the unworn part of the tooth-shaped mold core is leaked out again. And analogizing in sequence until the tooth-shaped mold core is completely worn and the service life of the tooth-shaped mold core is finished.
Description
Technical Field
The utility model relates to a gear shaping technical field, in particular to gear forming die.
Background
The traditional mold structure for molding the gear shown in fig. 5 comprises an upper mold base and a lower mold base, wherein a mold core assembly used for molding the gear is arranged between the upper mold base and the lower mold base, the mold core assembly comprises a gear hub mold core, a pore-forming part embedded into the gear hub mold core and used for molding a gear central hole, and a tooth-shaped mold core arranged at the upper end of the gear hub mold core, wherein the thickness of the tooth-shaped mold core is the same as that of the gear to be molded, and a first tooth matched with the gear teeth of the gear is arranged in the middle of the tooth-shaped mold core. When liquid plastic containing 50% of glass fiber is injected into the mold structure for injection molding, the abrasion of the tooth-shaped mold core is easily caused due to the high content of the glass fiber, so that the service life of the tooth-shaped mold core is shortened, the utilization rate of the mold is reduced, namely the number of injection molded gears is reduced, the tooth-shaped mold core cannot be repaired after being abraded, a new tooth-shaped mold core can only be processed again, and the production cost is increased; and after the tooth-shaped mold core is manufactured again, a large amount of measurement, test and other work is needed to test whether the newly manufactured tooth-shaped mold core is qualified or not, so that the production efficiency is not improved.
SUMMERY OF THE UTILITY MODEL
Problem to prior art existence, the utility model provides a gear forming die, profile of tooth mold core repeatedly usable when using, can effectively avoid the damage position of profile of tooth mold core, and needn't add new mold core again, be favorable to reduce cost, improve production efficiency.
The utility model adopts the technical proposal that:
a gear forming die comprises an upper die holder and a lower die holder, wherein a die core component for forming a gear is arranged between the upper die holder and the lower die holder, the die core component comprises a tooth hub die core, a tooth-shaped die core and a pore-forming part embedded into the tooth hub die core, a positioning groove for limiting the tooth-shaped die core is formed in the lower die holder, and the depth of the positioning groove is matched with the thickness of the tooth-shaped die core; the middle part of the tooth-shaped mold core is provided with a plurality of first teeth matched with the teeth of the gear, the tooth-shaped mold core is sleeved outside the tooth hub mold core, the upper part of the tooth-shaped mold core, the upper end of the tooth hub mold core and the pore-forming piece enclose a cavity for forming the gear, and the height of the cavity is matched with the thickness of the gear; the thickness of the tooth-shaped mold core is more than one point and five times larger than that of the gear, and a supporting piece used for lifting the tooth-shaped mold core is arranged between the tooth-shaped mold core and the lower die seat.
Furthermore, the support piece is a base plate, the base plate has various thickness specifications, and a first through hole matched with the outer diameter of the gear hub mold core is formed in the middle of the base plate.
Preferably, the supporting piece is a plurality of cushion blocks, the cushion blocks are uniformly distributed in the circumferential direction, and the cushion blocks have various thickness specifications.
Further, pore-forming spare middle part orientation the one end of upper die base extends the arch that has the centre bore matching with the gear, be provided with the sprue on the upper die base, protruding middle part seted up with the passageway of sprue intercommunication, protruding circumference equipartition is seted up and is used for the intercommunication the passageway with the breach of die cavity.
Furthermore, a second through hole for the protrusion to pass through and a plurality of grooves communicated with the second through hole and used for forming reinforcing ribs of the gear are formed in the middle of the gear hub mold core.
Furthermore, a plurality of second teeth meshed with the first teeth are uniformly distributed on the tooth hub mold core in the circumferential direction.
The beneficial effects of the above technical scheme are: the gear hub mold core is sleeved with the gear core, a cavity for forming the gear is defined by the upper part of the gear core, the upper end of the gear hub mold core and the pore-forming part, and the height of the cavity is matched with the thickness of the gear; the thickness of the tooth-shaped mold core is more than one-half and more than five times larger than that of the gear, and a supporting piece used for lifting the tooth-shaped mold core is arranged between the tooth-shaped mold core and the lower die seat. And liquid plastic is injected into the cavity from the upper die base, when the tooth-shaped die core in the cavity is worn, the tooth-shaped die core is taken out, the worn part of the tooth-shaped die core is removed, the supporting piece is placed into the lower die base and then the tooth-shaped die core is placed, the supporting piece lifts the tooth-shaped die core, and the unworn part of the tooth-shaped die core, the tooth-shaped hub die core and the pore-forming piece enclose a forming cavity. And when the tooth-shaped mold core is abraded again, the supporting piece is added on the basis of the original supporting piece, and the unworn part of the tooth-shaped mold core is leaked out again. And analogizing in sequence until the tooth-shaped mold core is completely worn and the service life of the tooth-shaped mold core is finished. Compared with the traditional tooth-shaped mold core, the service life of the tooth-shaped mold core in the technical scheme is prolonged by multiple times. The gear forming die is simple and reliable in structure, when the tooth-shaped die core is abraded, a new tooth-shaped die core does not need to be machined again, and a large amount of work such as measurement, test and the like does not need to be carried out to test whether the die core is qualified or not, so that the production cost is reduced, and the production efficiency is improved.
Drawings
Fig. 1 is an exploded view of a gear forming mold according to an embodiment of the present invention;
FIG. 2 is a schematic view of an assembly structure of the lower die holder and the die core assembly in the embodiment of the present invention;
FIG. 3 is a schematic structural view of a hole forming member according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a hub mold core in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a gear to be molded in an embodiment of the present invention.
Detailed Description
The structure of a gear forming die of the present invention will be described in detail below with reference to preferred examples and accompanying drawings.
Referring to fig. 1 and fig. 2, in an embodiment of the present invention, a gear forming mold has the following overall structure: the gear forming die comprises an upper die holder 8 and a lower die holder 1, wherein a die core component 6 for forming a gear 7 is arranged between the upper die holder 8 and the lower die holder 1, the die core component 6 comprises a gear hub die core 4, a tooth-shaped die core 5 sleeved outside the gear hub die core 4 and a hole forming part 3 embedded in the gear hub die core 4, and the hole forming part 3 is used for forming a central hole 71 of the gear 7; a plurality of first teeth 51 matched with the teeth 73 of the gear 7 are circumferentially arranged in the middle of the toothed mold core 5, and a plurality of second teeth 43 meshed with the first teeth 51 are circumferentially and uniformly distributed on the hub mold core 4. The upper part of a first tooth 51 of the tooth-shaped mold core 5, the upper end surface of the hub mold core 4 and the pore-forming piece 3 enclose a cavity for forming the gear 7, and the height of the cavity is matched with the thickness of the gear 7; the thickness of the tooth-shaped mold core 5 is more than one and a half times larger than that of the gear 7, and the upper mold base 8 is provided with a feeding port 81; a supporting piece for adjusting the working position of the tooth-shaped mold core 5 is arranged between the tooth-shaped mold core 5 and the lower die holder 1.
The concrete structure is as follows:
referring to fig. 1, in the present embodiment, the supporting member is a backing plate 2, the backing plate 2 has various thickness specifications to adapt to different wear heights of the tooth-shaped mold core 5, the thickness of the backing plate 2 is consistent with the wear height of the tooth-shaped mold core 5, the height of the upper surface of the tooth-shaped mold core 5 after the wear part is removed is guaranteed to be consistent each time, and further, the height of the cavity is guaranteed to be consistent each time. The middle part of the backing plate 2 is provided with a first through hole 21 matched with the outer diameter of the gear hub mold core 4. In fig. 5, the thickness of the gear 7 to be molded is five millimeters, the height of a cavity for molding the gear 7, which is defined by the upper part of the first tooth 51 of the tooth-shaped mold core 5, the hub mold core 4 and the pore-forming member 3, is five millimeters, and the thickness of the tooth-shaped mold core 5 can be thirty millimeters in advance. In other embodiments, the supporting member may also be a plurality of spacers having a plurality of thickness specifications to adapt to different wear heights of the tooth-shaped mold core 5, the increased thickness of the spacers is consistent with the wear height removed by the tooth-shaped mold core 5, the height of the upper surface of the tooth-shaped mold core 5 after the wear part is removed is guaranteed to be consistent each time, and further the height of the cavity is guaranteed to be consistent each time. The number of the cushion blocks is at least two, and the cushion blocks are uniformly distributed at the bottom end of the tooth-shaped mold core 5 and are not in contact with the tooth hub mold core 4. The number of the cushion blocks can be determined according to actual needs, and only the uniform stress of the tooth-shaped mold core 5 in the injection molding process is ensured.
The lower die holder 1 is provided with a positioning groove 11 for limiting the horizontal position of the tooth-shaped die core 5, and the depth of the positioning groove 11 is matched with the thickness of the tooth-shaped die core 5. When the tooth-shaped mold core 5 is worn, the worn part can be removed, then the backing plate 2 is placed in the positioning groove 11, then the tooth-shaped mold core 5 is placed on the backing plate 2, the backing plate 2 lifts the tooth-shaped mold core 5 by a corresponding height, namely, the unworn part of the first tooth 51 is lifted, so that the height of a cavity for forming the gear 7, which is defined by the upper part of the first tooth 51, the upper end surface of the tooth hub mold core 4 and the pore-forming member 3, is always five millimeters.
Referring to fig. 3, a protrusion 31 matched with the central hole 71 of the gear 7 extends from the middle of the hole forming member 3 to one end of the upper die holder 8, a channel communicated with the injection port 81 is formed in the middle of the protrusion 31, and four notches 311 for communicating the channel with the die cavity are uniformly formed in the circumference of the protrusion 31. In the present embodiment, the central hole 71 of the gear 7 is a circular hole, and the protrusion 31 may be configured in a cylindrical shape, and the passage is opened at the central position of the protrusion 31 along the axis thereof.
Referring to fig. 4, the central portion of the hub core 4 is formed with a second through hole 41 through which the protrusion 31 passes, and a plurality of grooves 42 communicating with the second through hole 41 and forming the ribs 72 of the gear 7. The number of grooves 42 is determined according to the number of ribs 72. The number and the installation position of the notches 311 correspond to the grooves 42. After the liquid plastic enters the channel through the injection port 81, the liquid plastic in the channel flows into the groove 42 through the notch 311, and after the liquid plastic is cooled, the reinforcing rib 72 is formed.
By adopting the gear forming die in the technical scheme, the thickness of the tooth-shaped die core 5 is set to be integral multiple of that of the gear 7, the tooth-shaped die core 5 is firstly placed into the positioning groove 11, the hole forming piece 3 is embedded into the tooth hub die core 4, and then the hole forming piece and the hole forming piece are placed into the tooth-shaped die core 5 along the first teeth 51 until the tooth hub die core 4 is contacted with the bottom of the positioning groove 11. The tooth-shaped mold core 5 is sleeved outside the tooth-shaped hub mold core 4, when the tooth-shaped mold core 5 in a cavity for forming the gear 7, which is formed by surrounding the upper part of the tooth-shaped mold core 5, the upper end surface of the tooth-shaped hub mold core 4 and the pore-forming member 3, is worn, the tooth-shaped mold core 5 is taken out, the worn part of the tooth-shaped mold core 5 is removed, the base plate 2 with the height consistent with that of the worn part is placed at the bottom of the positioning groove 11, and the tooth-shaped hub mold core 4 penetrates through the first. And then the toothed mold core 5 is placed, the cushion plate 2 lifts the toothed mold core 5, and the unworn part of the toothed mold core 5 leaks out by a corresponding height to form a cavity for forming the gear 7 with the gear hub mold core 4 and the pore-forming piece 3 again. When the tooth-shaped mold core 5 is abraded again, a cushion plate 2 with the same height as the abraded part is added on the basis of the original cushion plate 2, and the unworn part of the tooth-shaped mold core 5 is leaked out by a corresponding height. And analogizing in sequence until the tooth-shaped mold core 5 is completely worn and the service life of the tooth-shaped mold core 5 is over. Compared with the traditional method, the service life of the tooth-shaped mold core 5 in the technical scheme is prolonged by multiple times.
The gear forming die is simple and reliable in structure, when the tooth-shaped die core is abraded, a new tooth-shaped die core does not need to be machined again, and a large amount of work such as measurement, test and the like does not need to be carried out to test whether the die core is qualified or not, so that the production cost is reduced, and the production efficiency is improved.
While the above detailed description describes the preferred embodiment of the present invention, it is not intended to limit the scope of the present invention, but rather, the present invention is intended to cover by those skilled in the art all such modifications and equivalents as may be included within the spirit and scope of the present invention.
Claims (6)
1. A gear forming die comprises an upper die holder (8) and a lower die holder (1), a die core assembly (6) used for forming a gear (7) is arranged between the upper die holder (8) and the lower die holder (1), the die core assembly (6) comprises a gear hub die core (4), a tooth-shaped die core (5) and a hole forming piece (3) embedded into the gear hub die core (4), a positioning groove (11) used for limiting the tooth-shaped die core (5) is formed in the lower die holder (1), and the depth of the positioning groove (11) is matched with the thickness of the tooth-shaped die core (5); tooth form mold core (5) middle part is provided with a plurality of first tooth (51) that match with teeth of a cogwheel (73) of gear (7), its characterized in that: the tooth-shaped mold core (5) is sleeved on the outer side of the tooth-hub mold core (4), a cavity for forming the gear (7) is defined by the upper part of the tooth-shaped mold core (5), the upper end of the tooth-hub mold core (4) and the hole forming piece (3), and the height of the cavity is matched with the thickness of the gear (7); the thickness of the tooth-shaped mold core (5) is more than one point and five times larger than that of the gear (7), and a supporting piece used for lifting the tooth-shaped mold core (5) is arranged between the tooth-shaped mold core (5) and the lower die holder (1).
2. The gear shaping mold of claim 1, wherein: the support piece is a base plate (2), the base plate (2) has various thickness specifications, and a first through hole (21) matched with the outer diameter of the gear hub mold core (4) is formed in the middle of the base plate (2).
3. The gear shaping mold of claim 1, wherein: the supporting piece is a plurality of cushion blocks which are uniformly distributed in the circumferential direction, and the cushion blocks have various thickness specifications.
4. The gear shaping mold of claim 1, wherein: become hole spare (3) middle part orientation the one end of upper die base (8) is extended there is arch (31) that matches with centre bore (71) of gear (7), be provided with sprue (81) on upper die base (8), protruding (31) middle part seted up with the passageway of sprue (81) intercommunication, protruding (31) circumference equipartition has been seted up and has been used for the intercommunication the passageway with breach (311) of die cavity.
5. The gear shaping mold of claim 4, wherein: and a second through hole (41) for the protrusion (31) to pass through is formed in the middle of the gear hub mold core (4), and a plurality of grooves (42) which are communicated with the second through hole (41) and used for forming reinforcing ribs (72) of the gear (7) are formed.
6. The gear shaping mold of claim 1, wherein: and a plurality of second teeth (43) meshed with the first teeth (51) are uniformly distributed on the gear hub mold core (4) in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921114988.9U CN210705750U (en) | 2019-07-16 | 2019-07-16 | Gear forming die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921114988.9U CN210705750U (en) | 2019-07-16 | 2019-07-16 | Gear forming die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210705750U true CN210705750U (en) | 2020-06-09 |
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ID=70963101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921114988.9U Active CN210705750U (en) | 2019-07-16 | 2019-07-16 | Gear forming die |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210705750U (en) |
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2019
- 2019-07-16 CN CN201921114988.9U patent/CN210705750U/en active Active
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