CN211248274U - Liquid forging die for gear pump end cover blank - Google Patents

Abstract

The utility model discloses a liquid forging die for gear pump end cover blanks, which comprises an upper die and a lower die, wherein the upper die comprises a male die, the lower die comprises a female die in clearance fit with the male die, and one surface of the female die, which is far away from the end of the male die, is provided with a first through hole; the lower die further comprises at least one lower ejector rod, one end of the lower ejector rod is in clearance fit with the first through hole, and the other end of the lower ejector rod is connected with a driving mechanism. Because the mould is provided with the sufficient exhaust device, the mould can be filled to a greater extent without the defect of air hole inclusion in the process of continuously pressurizing and filling the mould under pressure, and simultaneously, a casting system without a riser is adopted, so that the machining allowance is reduced, the material is saved, and the manufacturing cost is reduced.

Description

Liquid forging die for gear pump end cover blank

Technical Field

The utility model belongs to the mould field, concretely relates to liquid forging mould of gear pump end cover blank.

Background

The gear pump is a rotary pump which is used for conveying liquid or pressurizing the liquid by means of working volume change and movement formed between a pump cylinder and a meshing gear, and two closed spaces are formed by two gears, a pump body and front and rear end covers.

The gear pump end cover is relatively complex in structure, forging is not easy to achieve, casting forming is generally adopted, but defects such as air holes and impurities are easy to generate in traditional sand casting or gravity casting, and therefore forming quality of the gear pump end cover is affected. The liquid die forging is a non-cutting process between casting and forging, belongs to a casting and forging crossed precision forming manufacturing technology, and when the liquid die forging is adopted to process the gear pump end cover, compared with the traditional sand casting or gravity casting, the forming quality of the gear pump end cover is better. The main process of liquid forging is to pour a certain amount of alloy liquid into a die, fill the die cavity with the alloy liquid under the pressure action of a male die, and then perform crystallization solidification, pressure feeding and plastic deformation. The liquid die forging process is a method for obtaining high-quality parts by applying higher mechanical pressure to liquid metal poured into a die to eliminate casting defects and generate certain plastic deformation when the liquid metal is solidified, and is an advanced process which is labor-saving, energy-saving and high in material utilization rate, and the obtained parts have higher mechanical properties and can approach or reach the level of forgings of the same alloy.

Therefore, the die used in the liquid forging forming process of aluminum alloy is very important, and if the design of the die is problematic, all the produced products are possibly defective waste products, so how to optimize the die and ensure the precision and the smoothness of the products is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses it is necessary to provide a liquid forging mould of gear pump end cover blank, lower ejector pin and die, die and terrace die all adopt clearance fit, have sufficient exhaust structure to very big avoiding the pore-free defect of mingling with, guaranteed the precision and the smooth finish of product.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a liquid forging die for gear pump end cover blanks comprises an upper die and a lower die, wherein the upper die comprises a male die, the lower die comprises a female die in clearance fit with the male die, and a first through hole is formed in one surface, away from the male die end, of the female die; the lower die further comprises at least one lower ejector rod, one end of the lower ejector rod is in clearance fit with the first through hole, and the other end of the lower ejector rod is connected with a driving mechanism.

Further, go up the mould still including last mould flange, it is in to go up mould flange rigid coupling the terrace die is kept away from the up end of die end, it keeps away from to go up the mould flange the up end rigid coupling of die end has the transitional coupling post, the transitional coupling post is kept away from the up end rigid coupling of last mould flange end has last mould connecting rod.

Furthermore, the clearance of clearance fit between the male die and the female die is 0.04-0.1 mm.

Furthermore, the male die and the female die are in clearance fit to form a die cavity, the male die is provided with a countersunk vent hole, and the countersunk vent hole is communicated with the die cavity.

Further, a coating protective layer is arranged on the inner side wall of the die cavity, and the coating protective layer is made of graphite or engine oil.

Further, the ejector pin is two down, and two the ejector pin is about down the plumb line axial symmetry of liquid forging mould, the ejector pin is kept away from down the one end rigid coupling of die end has ejector pin gland down, the ejector pin gland is kept away from down the one side rigid coupling of ejector pin end has ejector pin seat down.

Preferably, the lower ejector rod gland and the lower ejector rod seat are both flat-shaped, a counter bore is formed in the lower ejector rod gland, and the counter bore is used for connecting the lower ejector rod gland with the lower ejector rod; the lower ejector rod gland is fixedly connected with the lower ejector rod seat through a bolt.

Further, the clearance of the lower ejector rod in clearance fit with the first through hole is 0.02-0.04 mm.

Further, the upper die and the lower die are respectively and independently made of H13, 42CrMo or 3Cr2W 8V.

Compared with the prior art, the utility model discloses following beneficial effect has: the liquid forging die device for the end cover blank provided by the structure of the utility model can realize the filling of the product to a greater extent and does not have the cold shut defect in the process of continuously pressurizing and filling the product; direct pressurization is adopted, the pressurizing speed is low, and the lower ejector rod and the female die are in clearance fit, so that the device has a sufficient exhaust device and has no defect of air hole inclusion; a pouring system without a riser is adopted, so that the machining allowance is reduced, the material is saved, and the manufacturing cost is reduced; the inner side of the mold contacting with the aluminum liquid is provided with a coating protective layer, and the pressure is low, so that the service life of the mold is ensured.

Drawings

Fig. 1 is a schematic cross-sectional view of a liquid forging die according to a preferred embodiment of the present invention.

In the figure: 1-upper die connecting rod, 2-transition connecting column, 3-upper die flange, 4-male die, 5-female die, 6-lower ejector rod, 7-lower ejector rod gland, 8-lower ejector rod seat and 9-countersunk vent hole.

Detailed Description

To facilitate an understanding of the present invention, the present invention will be described more fully with reference to the following specific embodiments. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

As shown in fig. 1, a liquid forging die for gear pump end cover blanks comprises an upper die and a lower die, wherein the upper die comprises a male die 4, the lower die comprises a female die 5 in clearance fit with the male die 4, one side of the female die 5, which is far away from the end of the male die 4, is provided with a first through hole, specifically, the female die 5 is in clearance fit with the male die 4, the female die 5 and the male die 4 form a die cavity, one side of the female die 5, which is far away from the male die 4, is provided with a first through hole, the first through hole is communicated with the die cavity, preferably, the clearance of the female die 5 in clearance fit with the male die 4 is 0.04-0.1mm, on one hand, the defect that the die assembly is not tight due to too large clearance is avoided, so that.

Further, go up the mould and still include mould flange 3, transition joint post 2 and last mould connecting rod 1, go up mould flange 3 bolt rigid coupling on terrace die 4 keeps away from the one side of die 5, transition joint post 2 bolt rigid coupling is on last mould flange 3 keeps away from the one side of terrace die 4, go up mould connecting rod 1 bolt rigid coupling on transition joint post 2 keeps away from one end of mould flange 3, that is to say, go up the mould and be mould connecting rod 1 from top to bottom in proper order, transition joint post 2, go up mould flange 3 and terrace die 4, all adopt the bolt rigid coupling together, here transition joint post 2's main function is to reduce the distance between last mould and the lower mould. In this embodiment, the male die 4 is further provided with countersunk head vent holes 9, the number of which can be adjusted as required, in this embodiment, the number of the countersunk head vent holes 9 is 2, and the countersunk head vent holes penetrate through the die cavity, so that the die has a more sufficient exhaust device, and the product has no air impurity defect. Specifically, in this embodiment, a paint protection layer is further disposed on the inner side wall of the mold cavity, and the material of the paint protection layer is preferably graphite or engine oil, so as to protect the mold and facilitate demolding of the blank product in the mold cavity.

Further, with reference to fig. 1, the lower mold includes a female mold 5, a lower rod 6, a lower rod cover 7 and a lower rod seat 8. Specifically, the number of the lower carrier rods 6 is at least one, which can be adjusted as needed, and in the present embodiment, the number of the lower carrier rods 6 is 2, and is axisymmetric with respect to the perpendicular bisector of the liquid forging die. In the embodiment, the lower ejector rod 6 and the first through hole are coaxial and in clearance fit, the clearance fit interval is 0.02-0.04mm, air reversely enters the mold due to too large clearance, and the mold is not smooth in air exhaust due to too small clearance, so that the preferable range in the embodiment is 0.02-0.04 mm. Specifically, one end of the lower ejector rod 6, which is far away from the female die 5, is fixedly connected with a lower ejector rod gland 7, a counter bore is formed in the lower ejector rod gland 7, the lower ejector rod 6 is embedded into the counter bore so as to fixedly connect the lower ejector rod 6 with the lower ejector rod gland 7, a bolt is fixedly connected to one side, which is far away from the lower ejector rod 6, of the lower ejector rod gland 7, a lower ejector rod seat 8 is fixedly connected, in the embodiment, the lower ejector rod gland 7 and the lower ejector rod seat 8 are both flat-shaped, so that the stability of the die in.

Furthermore, the upper die and the lower die in the embodiment are respectively and independently made of H13, 42CrMo or 3Cr2W8V materials, so that the property is stable, the quality of a product can be further ensured, and the demoulding is smooth.

The specific processing is carried out by the following steps:

s1, installing a mold: installing an upper die and a lower die on a liquid die forging machine tool, wherein an upper die connecting rod 1 is in driving connection with an upper oil cylinder, and a lower ejector rod seat 8 is in driving connection with a lower oil cylinder;

s2, mold closing: starting a special liquid die forging machine tool, modulating an automatic die closing mode, and automatically closing an upper die and a lower die to form a die cavity;

s3, pouring: directly pouring aluminum liquid with the temperature of 660-;

s4, pressurized filling: pushing the upper die to move downwards at the speed of 5-50mm/s, and filling the whole die cavity with the aluminum liquid;

s5, maintaining compression and feeding: continuously pushing the upper die to continuously apply pressure to the aluminum liquid under the pressure of 20-80MPa, and keeping the pressure until the aluminum liquid is completely solidified;

s6, pressure relief stripping: and resetting the upper die, and ejecting the blank in the female die 5 through a lower ejector rod 6 driven by a lower oil cylinder to obtain a blank product.

The liquid forging die uses a riser-free pouring system, directly fills the die cavity, avoids riser waste and improves the utilization rate of materials. Because die 5 and 4 clearance fit of terrace die, lower ejector pin 6 and 5 clearance fit of die, terrace die 4 still is equipped with the countersunk head exhaust hole, therefore, the utility model provides a mould has sufficient exhaust apparatus, and gear pump end cover blank is at the forming process, and gaseous because pressure effect, gaseous passing through clearance and countersunk head exhaust hole discharge to realize the exhaust in the mould course of working, avoid gaseous aluminium alloy blank that piles up and cause to have defects such as needle eye, gas pocket and mix with, shrinkage porosity shrinkage cavity.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (8)

1. A liquid forging die for gear pump end cover blanks comprises an upper die and a lower die, wherein the upper die comprises a male die, and the liquid forging die is characterized in that the lower die comprises a female die in clearance fit with the male die, one surface of the female die, which is far away from the end of the male die, is provided with a first through hole, the male die and the female die are in clearance fit to form a die cavity, the male die is provided with a countersunk vent hole, and the countersunk vent hole is communicated with the die cavity; the lower die further comprises at least one lower ejector rod, one end of the lower ejector rod is in clearance fit with the first through hole, and the other end of the lower ejector rod is connected with a driving mechanism.

2. The liquid forging die of claim 1, wherein said upper die further comprises an upper die flange fixedly connected to an upper end surface of said male die remote from said female die end, said upper die flange fixedly connected to an upper end surface of said male die remote from said male die end having a transition connection post fixedly connected thereto, said transition connection post fixedly connected to an upper die connection rod remote from said upper die flange end.

3. The liquid forging die of claim 1, wherein said male die has a clearance for clearance fit with said female die of 0.04 to 0.1 mm.

4. The liquid forging die of claim 1, wherein a paint protective layer is disposed on the inner side wall of the die cavity, and the paint protective layer is made of graphite or engine oil.

5. The liquid forging die of claim 1, wherein there are two lower ejector pins, and the two lower ejector pins are axisymmetric with respect to a perpendicular bisector of the liquid forging die, and a lower ejector pin pressing cover is fixedly attached to an end of the lower ejector pin away from the die end, and a lower ejector pin seat is fixedly attached to a surface of the lower ejector pin pressing cover away from an end of the lower ejector pin.

6. The liquid forging die of claim 5, wherein the lower ejector rod gland and the lower ejector rod seat are both flat plates, and a counter bore is formed in the lower ejector rod gland and used for connecting the lower ejector rod gland with the lower ejector rod; the lower ejector rod gland is fixedly connected with the lower ejector rod seat through a bolt.

7. The liquid forging die of claim 1, wherein said lower ejector pin is coaxial with said first through hole and has a clearance of 0.02 to 0.04 mm.

8. The liquid forging die of claim 1, wherein said upper die and said lower die are each independently formed from H13, 42CrMo, or 3Cr2W 8V.

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