CN210435312U - Piston casting die utensil and exhaust structure - Google Patents

Abstract

The utility model discloses an exhaust structure, including the centre form and by the salt core bracing piece that stretches out in the salt core supported hole of centre form, the centre form be equipped with a plurality ofly with the exhaust duct of salt core supported hole intercommunication, the exhaust duct is followed the length direction of salt core supported hole runs through the extension setting. The utility model also discloses a piston casting die utensil. The exhaust structure reserves a special exhaust passage by processing the exhaust groove, eliminates the flashes near the oil inlet and outlet holes of the piston blank, improves the exhaust reliability and the production efficiency inside the cavity of the piston casting die, and reduces the rejection rate during casting operation and the working difficulty of subsequent procedures.

Description

Piston casting die utensil and exhaust structure

Technical Field

The utility model relates to a piston casting technical field, in particular to exhaust structure. Also relates to a piston casting mould.

Background

In the casting of gravity casting fashioned traditional aluminium piston blank, most air in the casting mould is discharged through the rising head 1 on mould top after the aluminum alloy solution is poured into, because piston inner chamber structure is complicated, leads to the casting mould to have many local narrow and small spaces, like regional, mould lid edge etc. between centre form 10 and salt core bracing piece 9.

In these narrow spaces, the phenomenon of unsmooth exhaust often exists, and the blank can not cast in situ in the place where the air is not exhausted after the aluminum liquid is solidified, namely the "feel suffocated" in the industry. In order to solve the problem of 'suffocating', the exhaust holes 8 are additionally arranged in the local narrow spaces or are in clearance fit at the beginning of the design of the mould, and because the area between the inner mould 10 and the salt core supporting rod 9 is complicated in structure and too narrow and is not suitable for the exhaust holes 8 to be arranged at the position, the exhaust is carried out through the fit clearance between the inner mould 10 and the salt core supporting rod 9 at present.

The existing gap exhaust has the following disadvantages: firstly, the size of a fit clearance between the salt core supporting rod 9 and the inner die 10 is naturally formed and is difficult to control, the exhaust effect of the casting die each time is good and poor, the casting die is unstable, and waste products are easy to generate; secondly, if the clearance is too large, burrs are generated at the edge of the oil inlet and outlet hole 7 of the blank, and the burden is increased for the subsequent blank machining process; thirdly, the fit clearance is easily blocked by the casting coating or rust sprayed on the surface of the inner mold 10 during the on-site casting operation, and the exhaust function is lost, so that the piston blank cannot be cast locally.

Therefore, it is an urgent technical problem to provide an exhaust structure that can solve the problem of unsmooth exhaust between the salt core support rod 9 and the inner mold 10, thereby effectively improving the casting defect.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an exhaust structure, through processing the air discharge duct with reserving out special exhaust passage, eliminated near piston blank business turn over oilhole "overlap", improved piston casting mould die cavity inside exhaust reliability and production efficiency, the rejection rate when having reduced the casting operation and the work degree of difficulty of subsequent handling. Another object of the utility model is to provide a piston casting die utensil.

In order to achieve the above object, the utility model provides an exhaust structure, including the centre form and by the salt core bracing piece that stretches out in the salt core supported hole of centre form, the centre form be equipped with the air discharge duct of salt core supported hole intercommunication, the air discharge duct is followed the length direction of salt core supported hole runs through the extension setting.

Preferably, the number of the exhaust grooves is multiple, and the exhaust grooves are uniformly distributed along the circumference of the salt core supporting hole.

Preferably, the number of the exhaust grooves is six, and the six exhaust grooves are arranged in an axisymmetrical manner.

Preferably, the exhaust groove is a square groove.

Preferably, the width of the square groove is 0.5-0.8mm, and the depth is 0.3-0.5 mm.

Preferably, the number of the salt core supporting rods is two, and the number of the salt core supporting holes is two.

Preferably, two of the salt core support rods are diagonally arranged.

Preferably, the inner die is further provided with an exhaust hole matched with the exhaust pin.

The utility model also provides a piston casting die utensil, including above-mentioned exhaust structure.

Preferably, in particular an aluminium alloy piston casting mould.

Compared with the prior art, the exhaust structure provided by the utility model comprises an inner mold, wherein the inner mold is provided with a salt core supporting hole, a salt core supporting rod is arranged in the salt core supporting hole and extends out of the salt core supporting hole, the inner mold is also provided with an exhaust groove, the exhaust groove is communicated with the salt core supporting hole, the exhaust groove extends through along the length direction of the salt core supporting hole, this exhaust structure establishes the exhaust duct with salt core supported hole intercommunication through adding in order to regard as special exhaust passage, be different from the fit clearance between salt core bracing piece and the salt core supported hole among the prior art, gaseous unobstructed the discharge along the exhaust duct, the solution of pouring into in the casting process has good exhaust effect in the exhaust duct, near piston blank business turn over oilhole "overlap" has been eliminated, the inside exhaust reliability and the production efficiency of piston casting mould die cavity have been improved, the rejection rate when having reduced the casting operation and the work degree of difficulty of subsequent handling.

Drawings

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

FIG. 1 is a schematic diagram of a prior art piston blank;

FIG. 2 is a schematic bottom view of the piston blank of FIG. 1;

FIG. 3 is a schematic view of the assembly of a prior art inner mold;

figure 4 is an assembled cross-sectional view of the inner mold of figure 3;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

fig. 6 is an assembly schematic diagram of an inner mold according to an embodiment of the present invention;

FIG. 7 is a schematic top view of the inner mold of FIG. 6;

fig. 8 is an enlarged partial view of the support holes of the salt core of fig. 7.

Wherein:

1-riser, 2-piston head, 3-insert ring, 4-inner cooling oil duct, 5-pin hole, 6-piston skirt, 7-oil inlet and outlet hole, 8-exhaust hole, 9-salt core support rod, 10-inner mold, 11-salt core support hole and 12-exhaust groove.

Detailed Description

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

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 1 to 8, wherein fig. 1 is a schematic structural diagram of a piston blank in the prior art, fig. 2 is a schematic structural diagram of the piston blank in fig. 1 as viewed from the bottom, fig. 3 is a schematic assembly diagram of an inner mold in the prior art, fig. 4 is a sectional assembly view of the inner mold in fig. 3, fig. 5 is a partially enlarged schematic view of a position a in fig. 4, fig. 6 is a schematic assembly diagram of the inner mold according to an embodiment of the present invention, fig. 7 is a schematic structural diagram of the inner mold in fig. 6 as viewed from the top, and fig. 8 is a partially enlarged schematic view of a salt core supporting hole in fig. 7.

The conventional piston blank comprises a dead head 1, a piston head 2 and a piston skirt 6, and further comprises an insert ring 3, a pin hole 5, an inner cooling oil channel 4 and an oil inlet and outlet hole 7 communicated with the inner cooling oil channel 4. Most of air in the casting mould is discharged from a riser 1, in order to solve the problem of exhaust of other small air in a local narrow space, the existing inner mould 10 adopts a mode of a matching gap between an exhaust hole 8 and a salt core support rod 9 and the inner mould 10, but the mode of the matching gap has unstable exhaust effect and has a plurality of casting defects.

In a specific embodiment, the utility model provides an exhaust structure includes centre form 10, and centre form 10 is equipped with salt core supported hole 11, is equipped with salt core bracing piece 9 in the salt core supported hole 11, and stretch out in salt core bracing piece 9 by salt core supported hole 11, and centre form 10 is equipped with exhaust duct 12, and exhaust duct 12 and salt core supported hole 11 intercommunication, exhaust duct 12 run through the extension setting along the length direction of salt core supported hole 11.

In this embodiment, the exhaust groove 12 is communicated with the salt core supporting hole 11, that is, the exhaust groove 12 is used as an exclusive exhaust channel between the salt core supporting rod 9 and the salt core supporting hole 11, and the arrangement of the exhaust groove 12 ensures that the salt core supporting rod 9 and the inner mold 10 have good exhaust performance.

For better technical effect, the quantity of exhaust groove 12 is a plurality of, and a plurality of exhaust grooves 12 evenly arrange along the circumference of salt core supported hole 11, specifically speaking, a plurality of exhaust grooves 12 are located around the edge of salt core supported hole 11 or salt core bracing piece 9, and the unobstructed exhaust of the casting in-process has further been ensured when the even salt core bracing piece 9 that surrounds of exhaust groove 12.

Illustratively, the number of the exhaust grooves 12 is six, and six exhaust grooves 12 are arranged axisymmetrically.

In this embodiment, the six exhaust grooves 12 surround the salt core support rod 9 in the shape of a regular hexagon, the six exhaust grooves 12 are axisymmetric around the central axis of the salt core support rod 9 or the salt core support hole 11, the salt core support rod 9 is fixed in the salt core support hole 11, and the six exhaust grooves 12 serve as special exhaust channels, so that many defects of fit clearance in the existing casting process are avoided.

For example, the exhaust groove 12 is a square groove, in other words, the sectional shape of the exhaust groove 12 is a square, the square groove is not only easy to process but also stable in structure, and similarly, the exhaust groove 12 having other shapes such as a circle can be adopted, and the invention also belongs to the description range of the embodiment.

For better technical effect, the width of the square groove is 0.5-0.8mm, the depth is 0.3-0.5mm, the length of the square groove is set according to the size difference of the internal mold 10 to ensure smooth exhaust, and no specific limitation is carried out here.

Illustratively, the width of the square groove is 0.6mm and the depth is 0.4 mm.

It should be noted that the above number and size settings are of particular significance for the square grooves, and specifically, firstly, the reason for uniformly processing the six square grooves at the edge of the salt core supporting hole 11 of the inner mold 10 is that too little exhaust effect is not obvious, and too much causes the edge strength of the salt core supporting hole 11 to be too low, which is easy to break; secondly, the width of the square groove is ensured to be 0.5-0.8mm, the depth of the square groove is ensured to be 0.3-0.5mm, and in the size range, due to the existence of the tension of the aluminum alloy solution, the aluminum liquid can not generate flash at the square groove.

Illustratively, the number of the salt core support rods 9 is two, the number of the salt core support holes 11 is the same as that of the salt core support rods 9, and two sets of salt core support rods 9 and salt core support holes 11 are respectively and correspondingly provided with two sets of exhaust grooves 12 with a plurality of exhaust grooves, so as to ensure smooth exhaust of the inlet and the outlet of the internal cooling oil duct 4 in the casting process.

In this embodiment, two salt core support rods 9 are arranged diagonally, and the inner mold 10 between the two salt core support rods 9 is further provided with an exhaust hole 8 matched with an exhaust pin.

The utility model also provides a piston casting die utensil, including above-mentioned exhaust structure, have above-mentioned exhaust structure's whole beneficial effect equally, here no longer give unnecessary details one by one.

Specifically, the piston casting mold is an aluminum alloy piston casting mold, and can fully solve the problem that the salt core supporting hole 11 in the conventional piston casting mold is unsmooth in exhaust, so that the casting defects of a series of casting sites such as 'bubbles' of an inner cooling oil passage 4 of the piston head 2 and 'gas blockage' of a platform of an oil inlet and outlet hole 7 are effectively overcome.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The piston casting mold and the exhaust structure provided by the utility model are described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. The exhaust structure is characterized by comprising an inner die (10) and a salt core supporting rod (9) extending out of a salt core supporting hole (11) of the inner die (10), wherein an exhaust groove (12) communicated with the salt core supporting hole (11) is formed in the inner die (10), and the exhaust groove (12) penetrates through and extends along the length direction of the salt core supporting hole (11).

2. The exhaust structure according to claim 1, characterized in that the number of the exhaust grooves (12) is plural, and the plural exhaust grooves (12) are arranged uniformly along the circumference of the salt core support hole (11).

3. The exhaust structure according to claim 2, characterized in that the number of the exhaust grooves (12) is six, and six exhaust grooves (12) are axisymmetrically arranged.

4. The exhaust structure according to claim 1, characterized in that the exhaust grooves (12) are square grooves.

5. The exhaust structure according to claim 4, wherein the width of the square groove is 0.5 to 0.8mm and the depth is 0.3 to 0.5 mm.

6. Exhaust structure according to claim 1, characterized in that the number of salt core support rods (9) is two and the number of salt core support holes (11) is two.

7. Exhaust structure according to claim 6, characterized in that two of the salt core support rods (9) are diagonally arranged.

8. Exhaust structure according to claim 1, characterized in that the inner mold (10) is further provided with exhaust holes (8) cooperating with exhaust pins.

9. A piston casting mold comprising the vent structure according to any one of claims 1 to 8.

10. Piston casting mould according to claim 9, characterised in particular an aluminium alloy piston casting mould.

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