CN115503189A - Method for producing automobile gear pump gear by central injection of mandrel and used die - Google Patents
Method for producing automobile gear pump gear by central injection of mandrel and used die Download PDFInfo
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- CN115503189A CN115503189A CN202211244502.XA CN202211244502A CN115503189A CN 115503189 A CN115503189 A CN 115503189A CN 202211244502 A CN202211244502 A CN 202211244502A CN 115503189 A CN115503189 A CN 115503189A
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- mandrel
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- runner
- cavity
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- 238000002347 injection Methods 0.000 title claims abstract description 44
- 239000007924 injection Substances 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 238000000465 moulding Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 4
- 230000008023 solidification Effects 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000012958 reprocessing Methods 0.000 abstract description 3
- 238000003754 machining Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2015/00—Gear wheels or similar articles with grooves or projections, e.g. control knobs
- B29L2015/003—Gears
Abstract
The invention discloses a method for producing an automobile gear pump gear by central injection of a mandrel, which is characterized in that a core shaft is provided with an injection channel, a glue inlet path is changed, the mandrel of the gear is changed into a part of the glue inlet channel, the glue is injected from the inside, the dimensional precision of a gear body is high after curing and forming, reprocessing is not needed, the torque resistance and the torsion of the gear are large, and the product quality is improved. The invention also provides a matched die for producing the gear by adopting the method.
Description
Technical Field
The invention relates to the field of national six-automobile gear pump production, in particular to a method for producing an automobile gear pump gear by central injection of a mandrel and a mold for producing the gear by adopting the method.
Background
The gear processing method of the gear pump for the automobile is that a metal core shaft is placed in a die, plastic fluid is injected into a gear body forming cavity of the die through a machine, and the plastic gear body and the core shaft are connected into a whole after solidification and forming. At present, the glue inlet is generally designed at the upper end face of the gear body, and after the product is solidified and demoulded, the glue inlet at the upper end face of the gear body can form a breaking point with a concave-convex uneven surface, so that the machining amount can only be reserved for the height of the gear body, and then the upper end face of the gear body is subjected to finish machining treatment. The gear pump gear has the advantages of small size, high precision requirement, high processing difficulty and high process requirement, and the requirement on the flatness tolerance of the end face of the gear body is within 7 micrometers. And then, the mandrel drives the gear body to rotate, the requirement of torque force is also required to be met, the joint surface of the mandrel and the plastic gear body cannot be a smooth round surface, the shaft section is generally designed to be square or flat, or knurling is carried out on the joint surface of the mandrel and the plastic gear body so as to improve the bonding force of the mandrel and the gear body. However, after the mandrel is processed into a square shape or a flat shape, the unilateral wall thickness of the plastic gear body after curing molding is inconsistent, so that the molding shrinkage of the gear body cannot be uniform and consistent, and the technical requirement of the tolerance of the product cannot be met; when the outer circle of the mandrel is knurled, the mandrel can be deformed under the action of a large radial force, and the straightness of the mandrel is influenced. Therefore, the whole processing difficulty of the gear is high, the ultrahigh precision of the gear is ensured, certain torque force can be borne, and the service reliability of the product is long in service life. If the technical problem that secondary machining is not needed in one-step injection molding of the gear is solved, the product quality can be further improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for producing the gear of the gear pump of the automobile by using central injection of the mandrel, which solves the problems, changes the original injection path, changes the mandrel of the gear into a part of the glue inlet channel, injects glue from the inside of the mandrel, has high dimensional precision of a solidified and formed gear body, does not need to be reprocessed, has large torque resistance and torsion of the gear, and improves the product quality. The invention also provides a matched die for producing the gear by adopting the method.
In order to achieve the purpose, the invention provides the following technical scheme:
the method for producing the gear of the gear pump of the automobile by injecting glue at the center of the mandrel comprises the following steps:
(1) the method comprises the following steps that a glue injection channel is formed in a mandrel, namely a blind hole is formed inwards from the top end face of the mandrel, at least one through hole is formed in the blind hole towards the shaft circumferential surface of the position where a gear body is formed by injection and solidification, and a glue injection port is formed at the end of the blind hole in the top end face of the mandrel;
(2) placing a mandrel into a mold, wherein an outlet of a through hole on the circumferential surface of the mandrel is positioned in a gear body forming cavity of the mold, and a glue injection port of the mandrel is communicated with a gate inlet of the mold through a gate sleeve and a gate runner;
(3) and injecting plastic fluid into the gear body forming cavity from the sprue inlet of the mold through the sprue runner, the inner sprue bush and the mandrel glue injection port, solidifying and forming the plastic fluid, and demolding to obtain the gear of the gear pump.
The injection plastic fluid enters the gear body forming cavity from the inside of the mandrel, the space size of the gear body forming cavity can meet the requirement of finished product high precision, the upper end face and the lower end face of the solidified and formed gear body do not need to be subjected to finish machining, the machining procedures are reduced, and the high-precision product is obtained after demolding; and the torque force of the gear can be improved without processing the circumferential surface of the shaft, so that the design requirement is met.
The central injection mold for the gear shaft of the automobile gear pump comprises a rear mold core, a front mold frame, a core shaft and an inner sprue bush, wherein a gear body forming cavity is arranged at the inner front section of the rear mold core, a core shaft lower section placing cavity is arranged at the rear section of the rear mold core, an inner sprue bush mounting cavity is arranged at the inner front section of the front mold core, a core shaft upper section placing cavity is arranged at the rear section of the front mold core, a sprue runner is arranged in the front mold frame, an inlet of the sprue runner is communicated with an inlet sprue of the front mold frame, a blind hole is formed in the core shaft from the top end surface inwards, and at least one through hole is formed in the blind hole towards the shaft circumferential surface of the position where the injection molding and solidification gear body is formed; the back mould benevolence, the preceding mould benevolence, when the preceding framed compound die, the chamber is placed to the dabber hypomere, gear body becomes the die cavity, dabber upper segment place the chamber, the interior sprue bush installation cavity, runner back end are located same horizontal center line, the dabber is placed and is placed the chamber in dabber upper segment place, gear body becomes the die cavity, the dabber hypomere and place the intracavity, the interior sprue bush installation cavity is installed including the sprue bush, the sprue that penetrates of its rear end grafting dabber blind hole, front end intercommunication runner.
The invention further improves the technical scheme that a driving gear, a driven gear and a group of two gear body forming cavities and a mandrel lower section placing cavity are arranged in the rear mold core, an inner sprue bush mounting cavity and a mandrel upper section placing cavity in the front mold core are correspondingly arranged, an inner sprue runner of the front mold frame comprises a main runner, a branch runner and a branch runner, the rear end of the main runner is communicated with the middle position of the branch runner, two ends of the branch runner are respectively connected with the branch runner, and the rear end of the branch runner is respectively connected with a glue injection port on the top end face of the mandrel of the driving gear and the driven gear. One mould can penetrate simultaneously and glue a set of two gears of shaping, improves production efficiency.
The invention further improves the technical scheme that the blind holes are positioned at the axle center of the mandrel, the bottom ends of the blind holes extend to the positions in the mandrel at the height of the area below the upper end surface and above the lower end surface of the gear body, and at least two through holes are uniformly distributed along the radial direction of the mandrel by the blind holes. The solidified plastic in the flow channels of the blind holes and the through holes and the gear body connection points coated outside the core shaft are evenly distributed, and the bearing torque is stronger.
According to a further improved technical scheme, the through holes are symmetrically arranged by taking the axis of the mandrel as a center, and are positioned in the mandrel and at equal height positions in the middle between the upper end face and the lower end face of the gear body. Two or four are symmetrically arranged, so that the glue injection pressure is reduced.
According to a further improved technical scheme of the invention, the through hole is vertical to the blind hole, the bottom wall of the through hole is higher than that of the blind hole, and a sunken cold material cavity is formed at the bottom of the blind hole. The pouring fluid just enters the inner wall of the mandrel with lower contact temperature, and the cold material cavity at the bottom of the blind hole can accommodate the pouring fluid, so that semi-solidified plastic can not be fused into a product in the production process of a gear product, and the inherent quality of the product is influenced.
According to a further improved technical scheme, a demoulding device is arranged behind a rear mould for mounting a rear mould core, the demoulding device comprises a material pushing plate, a rear mould supporting plate, a return stroke rod, a spring and an ejection ejector rod, the rear ends of the return stroke rod and the ejection ejector rod are fixed on the material pushing plate, reset groove holes are formed in the positions, corresponding to the return stroke rod, of the rear mould supporting plate and the rear mould core, the spring is sleeved on the return stroke rod, the top end of the return stroke rod extends into the reset groove holes, through holes are formed in the positions, corresponding to the ejection ejector rod, of lower section placing cavities of a mandrel on the rear mould supporting plate and the rear mould core, the ejection ejector rod penetrates through the through holes forwards to extend into a lower section placing cavity of the mandrel of the rear mould core and is contacted with the bottom end of the mandrel in the ejection rod. After the gear body is solidified and molded, the front push material pushing plate is only needed to drive the push-out ejector rod to push out a product, so that the demolding operation is convenient.
According to a further improved technical scheme of the invention, the demolding device is further provided with a bottom plate, a guide pillar is arranged on the bottom plate, a guide pillar hole is formed in the position, corresponding to the guide pillar, of the rear mold top plate, and the top end of the guide pillar extends into the guide pillar hole and is spaced from the top wall of the guide pillar hole by a stroke distance. Improve the operating stability of drawing of patterns, prevent the back mould layer board simultaneously and slide.
According to a further improved technical scheme of the invention, the bottom plate is provided with a support column, and the front end face of the support column is supported on the rear wall of the rear mould supporting plate. The pressure that bears the weight of the back mould layer board is transmitted for the bottom plate through the support column, prevents that the back mould layer board warp.
According to a further improved technical scheme of the invention, the glue injection opening of the blind hole of the mandrel is in an inverted trapezoid shape. The rear end opening of the inner sprue bush is conveniently inserted into the glue injection opening of the mandrel, the sprue runner and a condensate in the inner sprue bush form a whole after the plastic fluid is solidified, and the lower part in the glue injection opening of the mandrel is disconnected after demolding, so that the flatness of the top end surface of the mandrel is not influenced.
The invention has the beneficial effects that:
the production method changes the prior glue inlet path from the upper end surface of the gear body, changes the glue injection port into the mandrel, the mandrel becomes a part of the glue inlet flow channel, the glue is fed into the gear body molding cavity from inside to outside through the mandrel, the space size of the gear body molding cavity can achieve the high precision required by the design of the finished gear, the upper end surface and the lower end surface of the solidified and molded gear body do not need to be subjected to finish machining, the processing procedures are reduced, and the high-precision product can be obtained after demoulding; and need not to carry out processing to the perimeteric surface and can make gear torque capacity promote, reach the design requirement, gear body and dabber all can not take place the deformation.
Drawings
FIG. 1 is a top view of the inventive die;
FIG. 2 isbase:Sub>A sectional view A-A of FIG. 1;
FIG. 3 is a partially enlarged schematic view of FIG. 2;
FIG. 4 is a schematic cross-sectional view of a gear produced according to the present invention;
fig. 5 is a schematic structural diagram of a conventional product in which glue is fed from the end face of a gear.
Detailed Description
As shown in fig. 1 to 3, the central injection mold for the gear shaft of the gear pump of the automobile comprises a rear mold core 1, a front mold core 2, a front mold frame 3, a mandrel 4, an inner sprue bush 5 and a demolding device 6, wherein the mandrel 4 is provided with a blind hole 41 from the top end surface inwards, the bottom end of the blind hole 41 is positioned at the position of the middle between the upper end surface and the lower end surface of a plastic gear body which is cast and molded and is higher than the inner height of the mandrel 4, two through holes 42 are symmetrically distributed from the blind hole along the radial direction of the mandrel in a left-right mode, a through hole 42 is vertical to the blind hole 41, and is arranged on the shaft peripheral surface of the position where the injection glue is solidified into the gear body, a driving gear and a driven gear are arranged in the rear die core 1, a group of two gear body forming cavities 11 and a mandrel lower section placing cavity 12 are formed in the rear die core, the gear body forming cavity 11 is arranged at the front section, the mandrel lower section placing cavity 12 is arranged at the rear section, two groups of inner sprue bush mounting cavities 21 and a mandrel upper section placing cavity 22 are arranged in the front die core 2, the inner sprue bush mounting cavities 21 are arranged at the front section and the mandrel upper section placing cavity 22 are arranged at the rear section, a sprue runner 31 is arranged in the front die frame 3, the sprue runner 31 comprises a main runner 311, a branch runner 312 and a branch runner 313, the rear end of the main runner 311 is communicated with the middle position of the branch runner 312, and two ends of the branch runner 312 are respectively connected with the branch runner 313; rear mold core 1, front mold core 2, when front mold frame 3 compound die, drive gear, cavity 12 is placed to a set of two each dabber hypomere of driven gear, gear body becomes cavity 11, the chamber 22 is placed to the dabber upper segment, sprue bush installation cavity 21, it is on same horizontal central line that a runner 313 is located, drive gear's dabber 4 and driven gear's dabber 4 place respectively in the dabber upper segment and place cavity 22, gear body becomes cavity 11, the dabber hypomere is placed in cavity 12, sprue bush 5 is installed in sprue bush installation cavity 21, the inverted trapezoidal type of its rear end grafting dabber blind hole 41 penetrates the runner, the runner 313 of front end intercommunication runner 31. The inlet of the main flow passage 311 communicates with the inlet gate 32 of the front mold frame 3.
The bottom wall of the through hole 42 is higher than that of the blind hole 41, and a concave cold material hole 43 is formed at the bottom of the blind hole 41.
The rear of the rear die for installing the rear die core is provided with a demoulding device 6, the demoulding device 6 comprises a bottom plate 60, a material pushing plate 61, a rear die supporting plate 62, a return rod 63, a spring 64 and an ejection ejector rod 65, the rear end of the return rod 63 and the ejection ejector rod 65 are fixed on the material pushing plate 61, the rear die supporting plate 62 and the rear die core 1 are provided with a reset groove hole corresponding to the position of the return rod 63, the return rod 63 is sleeved with the spring 64, the top end of the return rod extends into the reset groove hole, the rear die supporting plate 62 and the rear die core 1 are provided with a through hole corresponding to the ejection ejector rod 65, and the ejection ejector rod 65 forwards penetrates through the through hole to extend into the lower mandrel section of the rear die core 1 to be placed in the cavity 12 and is attached to the bottom end of a mandrel 4 in the cavity.
The bottom plate 60 is provided with a guide post 66, the rear die top plate 61 is provided with a guide post hole 67 corresponding to the guide post, and the top end of the guide post 66 extends into the guide post hole 67 to leave a stroke distance with the top wall of the guide post hole.
A supporting column 68 is arranged on the bottom plate 60, and the front end surface of the supporting column 68 is supported on the rear wall of the rear mould supporting plate 62.
The invention discloses a method for producing an automobile gear pump gear by central injection of a mandrel, which comprises the following steps:
(1) a glue injection channel is arranged on the mandrel 4, namely a blind hole 41 is inwards arranged from the top end surface of the mandrel, at least one through hole 42 is arranged on the shaft peripheral surface of the position of the gear body 7 formed by injecting glue to the blind hole 41, and the end of the blind hole on the top end surface of the mandrel is a glue injection port;
(2) the mandrel 4 is placed in a mold, the outlet of the through hole 42 on the circumferential surface of the mandrel is positioned in the gear body forming cavity 11 of the mold, and the glue injection port of the mandrel is communicated with the gate 32 of the mold through the inner gate sleeve 5 and the gate runner 31;
(3) and injecting plastic fluid into the gear body forming cavity 11 from a gate 32 of the mold through a gate runner 31, the inner gate sleeve 5 and the core shaft 4 glue injection port, solidifying and forming the plastic fluid, and demolding to obtain the gear of the gear pump.
The gear pump gear after injection and demoulding is shown in figure 4, the size of the gear body 7 is directly determined by the gear body forming cavity 11 in the mould, reprocessing is not needed, and the precision is high; meanwhile, the formed gear body 7 after demoulding is connected with the filling block 44 in the glue injection channel in the core shaft 4 into a whole, the torque force is large, square or knurling and other reprocessing on the outer peripheral surface of the core shaft contacted with the gear body is not needed to obtain enough torque force, the working procedures are reduced, and the gear body or the core shaft is prevented from being deformed.
The gear product that the mouth design was glued at the gear body up end position in gear body shaping cavity is advanced in the comparison, and the ejection of glue drawing of patterns is shown in fig. 5. Because the gate of the gear is arranged on the upper end surface of the gear body, after demoulding, the corresponding position on the upper end surface of the gear body is provided with a concave-convex uneven breaking point 8 formed by breaking the gate, so that the upper end surface of the gear body needs to be finely processed after demoulding, and the gear body has small volume and high required precision (the tolerance is within 7 microns), so the processing difficulty is very high. Meanwhile, in order to achieve the purpose that the gear pump can bear the torque force required by regulations in later use, the peripheral surface part 9 of the mandrel connected with the gear body is processed into a square or flat shape, and the molding shrinkage of the gear body 7 cannot be uniform and consistent due to the difference of the wall thickness of the gear body formed by glue injection, so that the technical requirement of the tolerance of the product cannot be met; the peripheral surface of the mandrel 4 can also be knurled, and the mandrel can also generate deformation under the action of great radial force when the outer circle of the mandrel 4 is knurled, so that the straightness of the mandrel is influenced.
Claims (10)
1. The method for producing the gear of the automobile gear pump by using central injection of the mandrel is characterized by comprising the following steps of:
(1) the method comprises the following steps that a glue injection channel is formed in a mandrel (4), namely a blind hole (41) is formed inwards from the top end face of the mandrel, at least one through hole (42) is formed in the blind hole (41) towards the shaft peripheral face of the position where glue is injected and solidified into a gear body (7), and the end of the blind hole on the top end face of the mandrel is a glue injection port;
(2) the mandrel (4) is placed in a mould, the outlet of a through hole (42) on the circumferential surface of the mandrel is positioned in a gear body forming cavity (11) of the mould, and a glue injection port of the mandrel is communicated with a sprue inlet (32) of the mould through an inner sprue bush (5) and a sprue runner (31);
(3) and injecting plastic fluid into the gear body molding cavity (11) from a gate (32) of the mold through a gate runner (31), the inner gate sleeve (5) and the core shaft (4) glue injection port, solidifying and molding the plastic fluid, and demolding to obtain the gear of the gear pump.
2. Car gear pump gear shaft center is penetrated and is glued mould, its characterized in that: the rear mold core (1), the front mold core (2), the front mold frame (3), a mandrel (4) and an inner sprue bush (5), a gear body forming cavity (11) is arranged at the inner front section of the rear mold core (1), a mandrel lower section placing cavity (12) is arranged at the rear section, an inner sprue bush mounting cavity (21) is arranged at the inner front section of the front mold core (2), a mandrel upper section placing cavity (22) is arranged at the rear section, a sprue runner (31) is arranged in the front mold frame (3), an inlet of the sprue runner (31) is communicated with an inlet sprue (32) of the front mold frame (3), a blind hole (41) is formed in the top end surface of the mandrel (4), and at least one through hole (42) is formed in the blind hole (41) towards the shaft peripheral surface of the position where the injection molding and solidification are performed to form a gear body; rear die core (1), front die core (2), cavity (12) are placed to the dabber hypomere when preceding framed (3) compound die, gear body becomes die cavity (11), chamber (22) are placed to the dabber upper segment, sprue bush installation cavity (21), runner (31) back end is located same horizontal center line, dabber (4) are placed and are placed chamber (22) in the dabber upper segment, gear body becomes die cavity (11), the dabber hypomere is placed in cavity (12), sprue bush (5) are installed in sprue bush installation cavity (21), the sprue that jets of its rear end grafting dabber blind hole (41), front end intercommunication runner (31).
3. The automobile gear pump gear shaft center injection mold of claim 2, wherein: be equipped with drive gear, a set of two gear body molding cavities of driven gear (11), the dabber hypomere in back mould benevolence (1) and place chamber (12), the corresponding setting in sprue bush installation cavity (21), the dabber upper segment of front mould benevolence (2) place chamber (22), sprue runner (31) includes sprue (311), branch footpath runner (312), branch runner (313) in front mould frame (3), sprue (311) rear end intercommunication branch footpath runner (312) intermediate position, branch footpath runner (312) both ends branch runner (313), and the mouth of penetrating on drive gear, driven gear's dabber (4) top end face is connected respectively to branch runner (313) rear end.
4. The automobile gear pump gear shaft center injection mold as claimed in claim 2 or 3, wherein: the blind hole (41) is located the dabber axle center, and the bottom of blind hole (41) extends to the dabber internal position of gear body below the up end, the regional height above the lower terminal surface, and at least two are evenly distributed along the dabber radial by the blind hole to through-hole (42).
5. The automobile gear pump gear shaft center injection mold as claimed in claim 2 or 3, wherein: the through holes (42) are symmetrically arranged by taking the axis of the mandrel as the center, and the through holes (42) are positioned in the mandrel (4) at the same height as the middle between the upper end surface and the lower end surface of the gear body.
6. The automobile gear pump gear shaft center injection mold as claimed in claim 2 or 3, wherein: the through hole (42) is vertical to the blind hole (41), the bottom wall of the through hole (42) is higher than the bottom wall of the blind hole (41), and a sunken cold material hole (43) is formed at the bottom of the blind hole (41).
7. The central injection mold for the gear shaft of the gear pump of the automobile as claimed in claim 2, wherein: the rear die is provided with a demoulding device (6) at the rear part of the rear die for mounting the rear die core, the demoulding device (6) comprises a material pushing plate (61), a rear die supporting plate (62), a return rod (63), a spring (64) and an ejection ejector rod (65), the return rod (63) and the rear end of the ejection rod (65) are fixed on the material pushing plate (61), the rear die supporting plate (62), the position of the rear die core (1) corresponding to the return rod (63) is provided with a reset groove hole, the return rod (63) is sleeved with the spring (64), the top end of the return rod extends into the reset groove hole, the rear die supporting plate (62), the lower section of the core shaft of the rear die core (1) is provided with a through hole corresponding to the ejection rod (65), and the ejection rod (65) forwards penetrates through the through hole to extend into the lower section of the core shaft of the rear die core (1) to be provided with a cavity (12) and is contacted with the bottom end of a core shaft (4) in the ejection rod.
8. The automobile gear pump gear shaft center injection mold of claim 7, wherein: the demolding device (6) is further provided with a bottom plate (60), a guide pillar (66) is arranged on the bottom plate (60), a guide pillar hole (67) is formed in the position, corresponding to the guide pillar, of the rear mold top plate (61), and the top end of the guide pillar (66) extends into the guide pillar hole (67) and is spaced from the top wall of the guide pillar hole.
9. The automobile gear pump gear shaft center injection mold of claim 7, wherein: and a supporting column (68) is arranged on the bottom plate (60), and the front end surface of the supporting column (68) is supported on the rear wall of the rear mould supporting plate (62).
10. The automobile gear pump gear shaft center injection mold of claim 2, wherein: and the glue injection port of the blind hole of the mandrel is in an inverted trapezoid shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211244502.XA CN115503189A (en) | 2022-10-12 | 2022-10-12 | Method for producing automobile gear pump gear by central injection of mandrel and used die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211244502.XA CN115503189A (en) | 2022-10-12 | 2022-10-12 | Method for producing automobile gear pump gear by central injection of mandrel and used die |
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| Publication Number | Publication Date |
|---|---|
| CN115503189A true CN115503189A (en) | 2022-12-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211244502.XA Pending CN115503189A (en) | 2022-10-12 | 2022-10-12 | Method for producing automobile gear pump gear by central injection of mandrel and used die |
Country Status (1)
| Country | Link |
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| CN (1) | CN115503189A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117359883A (en) * | 2023-12-05 | 2024-01-09 | 天津汇友连众精密模具股份有限公司 | Gear shaft injection mold |
-
2022
- 2022-10-12 CN CN202211244502.XA patent/CN115503189A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117359883A (en) * | 2023-12-05 | 2024-01-09 | 天津汇友连众精密模具股份有限公司 | Gear shaft injection mold |
| CN117359883B (en) * | 2023-12-05 | 2024-03-12 | 天津汇友连众精密模具股份有限公司 | Gear shaft injection mold |
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