CN211990882U

CN211990882U - Low-pressure casting mold for wheel

Info

Publication number: CN211990882U
Application number: CN202020163647.7U
Authority: CN
Inventors: 赵雷; 陈学武; 郭振宇; 李健; 李可; 王占库
Original assignee: Citic Dicastal Co Ltd
Current assignee: Citic Dicastal Co Ltd
Priority date: 2020-02-12
Filing date: 2020-02-12
Publication date: 2020-11-24
Anticipated expiration: 2030-02-12

Abstract

The utility model belongs to the technical field of low-pressure casting dies, in particular to a low-pressure casting die for a wheel, a side die comprises a side die frame and a water cooling block, improves the prior integrated side die, provides a novel split type water-cooling side die structure, an arc-shaped water channel is processed in the water cooling block, blind holes which are in one-to-one correspondence with the positions of the hot junctions are arranged, the red copper insert is embedded in the blind hole, so that the cooling capacity of the die is enhanced to a great extent, the rapid and efficient cooling of the thick and large thermal junction area is realized, meanwhile, the solidification speed of the aluminum liquid is improved, a reasonable sequential solidification temperature gradient is constructed, the probability of occurrence of casting defects such as shrinkage porosity and shrinkage cavity in a heat junction area is reduced, the temperature of the mold is also obviously reduced, the supercooling degree of a casting is increased, the internal grain structure is refined, and the mechanical property of the wheel is improved.

Description

Low-pressure casting mold for wheel

Technical Field

The application relates to the technical field of low-pressure casting dies, in particular to a low-pressure casting die for a wheel.

Background

At present, the aluminum alloy wheel hub is produced by generally adopting a low-pressure casting technology in the industry, high-temperature aluminum liquid enters a mold cavity from a central pouring gate under the driving of external pressure, and solidification forming is completed under the combined action of the mold and external cooling, so that a qualified casting meeting requirements is obtained. However, in actual production, the connecting part of the spoke and the rim is thick and large, and a typical casting thermal node is formed, so that the connecting part becomes a high-incidence area of defects, the waste accounts for a large proportion, the yield is severely limited, and the difficulty in the casting process is also included. In the prior art, wheel hub manufacturers generally adopt a mode of directly blowing compressed air onto the surface of a mold to realize the cooling of a hot spot, so that the rapid solidification and crystallization of aluminum liquid are ensured. However, because the structure of the hot spot area is very thick, the heat is too concentrated, and the heat conductivity of air is very low, the heat is difficult to be rapidly and effectively dissipated by the method, and finally the aluminum liquid is slowly solidified, and the casting defects such as shrinkage porosity, shrinkage cavity and the like are caused at the hot spot because the timely feeding cannot be obtained. In addition, the super-cooling degree is reduced due to the excessively high temperature of the die, crystal grains in the casting are coarse, the structure is loose and not compact, the mechanical property is low, the quality of the casting cannot meet the requirements of customers at all, and the development of enterprises is restricted.

Disclosure of Invention

The embodiment of the application provides a wheel low pressure casting mould, has strengthened the cooling capacity to the hot spot region, has realized the rapid cooling of aluminium liquid, has promoted the solidification crystallization of foundry goods to effectual casting problems such as shrinkage porosity, shrinkage cavity that have solved the hot spot and easily appear, simultaneously, the inside grain structure of foundry goods has also obtained obvious refining, and mechanical properties has promotion by a wide margin, has realized the high quality production of wheel.

In order to achieve the above object, the utility model provides a following technical scheme:

the first aspect provides a low-pressure casting mold for a wheel, which comprises a bottom mold, a top mold and side molds, wherein the bottom mold, the top mold and the side molds jointly enclose a mold cavity, each side mold comprises a side mold frame and a water cooling block, and a cavity is processed in a region corresponding to a hot spot at the joint of a spoke and a rim by the side molds to form the side mold frame; the cavity is not communicated with the mold cavity; the water cooling block is arranged in the cavity, an arc-shaped water channel is processed in the water cooling block, the arc-shaped water channel forms a circular ring surrounding the die cavity, and the arc-shaped water channel is not communicated with the cavity; processing blind holes on one side surface of the water cooling block facing to the mold cavity, wherein the blind holes are not communicated with the arc-shaped water channel, the positions of the blind holes correspond to the positions of the hot junctions one by one, and the number of the blind holes is equal to that of the hot junctions; and red copper inserts are embedded in the blind holes.

In some embodiments, a water inlet hole and a water outlet hole are machined on the outer side surface of the water cooling block, and a corresponding water inlet pipe connector and a corresponding water outlet pipe connector are welded, and the water inlet pipe connector and the water outlet pipe connector are communicated with external water cooling equipment to form a cooling water circulation passage.

In some embodiments, the aperture size of the blind holes and the size of the red copper inserts are adjusted according to the size of a wheel thermal joint area, and the number of the blind holes and the number of the red copper inserts are consistent with that of spokes.

In some embodiments, the upper and lower sides of the cavity are flat heat conducting surfaces; the upper side and the lower side of the water cooling block are flat heat conducting surfaces; the upper side and the lower side of the cavity are matched with the upper side and the lower side of the water cooling block to form a heat transfer structure.

In some embodiments, the flat thermally conductive surface has a surface roughness Ra < 1.6.

In some embodiments, the water cooling block is removably and fixedly mounted within the cavity.

In some embodiments, the arc-shaped water channel is U-shaped in cross section, and two ends of the arc-shaped water channel are welded and sealed by baffles

In some embodiments, the side die frame and the water cooling block are made of steel 35CrMo, the side die frame is integrally formed by casting, and the water cooling block is formed by forging.

In some embodiments, the end of the arc-shaped water channel is less than 20mm away from the side mounting surface, and the end of the blind hole is 5-10mm away from the cavity surface of the arc-shaped water channel.

In some embodiments, the front side and the rear side of the water cooling block are arc-shaped, and the water cooling block is tightly attached to the inner wall of the cavity.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a low pressure casting mould for wheels, the side mould comprises a side mould frame and a water cooling block, the existing integrated side mould is improved, a novel split type water cooling side mould structure is provided, an arc-shaped water channel is processed in the water cooling block, blind holes which are in one-to-one correspondence with the positions of thermal junctions are arranged, red copper inserts are embedded in the blind holes, the cooling capacity of the mould is enhanced to a great extent, the rapid and high-efficiency cooling of thick and large thermal junction areas is realized, simultaneously the solidification speed of aluminum liquid is improved, a reasonable sequential solidification temperature gradient is constructed, the probability of occurrence of casting defects such as shrinkage porosity and shrinkage cavity of the thermal junction areas is reduced, the temperature of the mould is obviously reduced, the supercooling degree of a casting piece is increased, the internal crystal grain structure is refined, the mechanical property of the wheels is improved, in addition, the new side mould structure shortens the casting production cycle of the wheels, the production efficiency is improved, and water-cooling block detachable installs on the side forms frame, split type structure can also make into standard spare parts with the water-cooling block, is convenient for directly change like this, has avoided scrapping the condition of whole mould, has reduced the manufacturing cost of enterprise.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a first structural schematic diagram of a low-pressure casting mold for a wheel according to the present invention;

fig. 2 is a structural schematic diagram of a low-pressure casting mold for a wheel according to the present invention;

fig. 3 is a schematic structural diagram of a side die frame of a low-pressure casting die for a wheel according to the present invention;

fig. 4 is a schematic structural diagram of a water cooling block of the low-pressure casting mold for the wheel of the present invention;

wherein: 1-bottom die, 2-top die, 3-side die, 4-side die frame, 5-cavity, 6-second threaded hole, 7-water cooling block, 8-flange structure, 9-first threaded hole, 10-upper heat conducting surface of cavity, 11-lower heat conducting surface of cavity, 12-upper heat conducting surface of water cooling block, 13-lower heat conducting surface of water cooling block, 14-arc water channel, 15-side matching surface, 16-red copper insert, 17-water inlet pipe joint, 18-water outlet pipe joint, 19-mounting bolt, 20-water inlet hole and 21-water outlet hole.

Detailed Description

The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1:

embodiment 1 of the present application is described below with reference to fig. 1 to 4 of the specification, and a low-pressure casting mold for a wheel includes a bottom mold 1, a top mold 2, and side molds 3, where the bottom mold 1, the top mold 2, and the side molds 3 together enclose a mold cavity, so as to complete smooth forming of a wheel casting. Modified side forms is split type structure, including side forms frame 4 and water-cooling piece 7 two parts, and cast steel 35CrMo is chooseed for use to the material of side forms frame 4, but reduction in manufacturing cost casts integral type side forms 3 the regional processing of the hot spot that corresponds spoke and rim junction on the side forms 3 goes out cavity 5, forms side forms frame 4. The cavity 5 is not communicated with the mould cavity. The cavity 5 comprises an upper heat conducting plane 10 of the cavity and a lower heat conducting plane 11 of the cavity, precise milling is required, and the surface roughness Ra is guaranteed to be less than 1.6, so that efficient heat transfer is realized.

The water cooling block 7 is detachably and fixedly arranged in the cavity 5, an arc-shaped water channel 14 is processed in the water cooling block 7, the arc-shaped water channel 14 forms a circular ring surrounding the mold cavity, and the arc-shaped water channel 14 is not communicated with the cavity 5. The water cooling block 7 is formed by forging, the material is forged steel 35CrMo, the structure is compact and water leakage is not easy to happen. The height of the water cooling block 7 is consistent with that of the cavity 5 on the side die frame 4, the upper side surface and the lower side surface of the water cooling block are respectively an upper heat conducting surface 12 of the water cooling block and a lower heat conducting surface 13 of the water cooling block, and the surface roughness Ra is required to be less than 1.6. The last heat conduction plane 10 of cavity and the lower heat conduction plane 11 of cavity and the last heat conduction surface 12 of water-cooling piece and the lower heat conduction surface 13 of water-cooling piece all are level and smooth heat conduction surface, the last heat conduction plane 10 of cavity and the last heat conduction surface 12 of water-cooling piece cooperate, and the lower heat conduction plane 11 of cavity and the lower heat conduction surface 13 of water-cooling piece cooperate and form the heat transfer structure to realize efficient heat transfer. The water cooling block 7 is assembled in the cavity 5 and used for intensively cooling the position of the thick and large thermal node, and the water cooling block and the thermal node are tightly matched to ensure the heat conduction.

An arc-shaped water channel 14 is processed on the water cooling block 7, the cross section of the water cooling block is U-shaped, two ends of the arc-shaped water channel 14 are welded and sealed by baffles, and the distance between the tail end of the arc-shaped water channel and a side matching surface 15 is required to be less than 20mm so as to ensure that the joint of the side die has enough cooling strength; a water inlet hole 20 and a water outlet hole 21 are processed on the outer side surface of the water cooling block 7, a stainless steel water inlet pipe connector 17 and a stainless steel water outlet pipe connector 18 are welded respectively, the connectors are connected with external water cooling equipment or water storage equipment to form a sealed cooling water circulation passage, a water channel and the connectors need to be sealed by a strict welding process, and water leakage accidents cannot happen. Processing the blind hole on the side of water-cooling block 7 orientation mould die cavity, the blind hole with arc water course 14 does not communicate, the position of blind hole with the regional position one-to-one of foundry goods thermal link, and the quantity of blind hole equals the quantity of thermal link imbed red copper in the blind hole and inserted 16, its tip apart from the water course die cavity face 5-10mm, can further press close to the thermal link position with the cooling like this to strengthen its heat dissipation heat conductivility. The size of the red copper insert 16 is adjusted according to the size of the hot spot area of the casting, and the number of the red copper insert is consistent with that of the spoke.

The front side and the rear side of the water cooling block 7 are arc-shaped, the water cooling block 7 is tightly attached to the inner wall of the cavity 5, flange structures 8 are machined on two sides of the

water cooling block

7, 1 first threaded hole 9 is drilled respectively, a second threaded hole 6 is correspondingly formed in the side die frame 4, and the water cooling block 7 and the side die frame 4 are fixed into a whole by means of 2M 16 mounting bolts 19 penetrating through the first threaded holes 9 and penetrating into the second threaded holes 6. During the operating condition, cooling water gets into the circulation flow in the closed water course to further extend to thick big thermal junction region through red copper insert 16 with cooling, thereby can high efficiency take away the heat of gathering, realized the rapid cooling of thermal junction.

In other embodiments, the detachable fixed connection between the water cooling block 7 and the side form frame 4 may also be a fixed connection by means of a snap, a fixed key or a fixed pin.

The utility model discloses simple structure has designed side forms water-cooling piece and red copper mold insert structure, great reinforcing the regional cooling heat absorption ability of heat festival, through quick heat conduction cooling, has improved the solidification rate of aluminium liquid, has eliminated the probability that shrinkage porosity, shrinkage cavity defect appear, simultaneously, has strengthened the foundry goods super-cooled rate, has refined inside grain structure, improves the mechanical properties of foundry goods, in addition, casting production cycle has obviously shortened, has improved production efficiency; the side form water cooling block can be made into a standard spare part, is convenient to replace and maintain, and reduces the production cost of enterprises. In a word, the application of the novel die optimizes the casting process of the wheel and further realizes high-quality production of the wheel.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. The utility model provides a wheel low pressure casting mould, includes die block, top mould and side forms, and die block, top mould and side forms enclose into mould cavity, its characterized in that jointly:

the side die comprises a side die frame and a water cooling block, and a cavity is processed in a region of the side die corresponding to a hot spot at the joint of the spoke and the rim to form the side die frame; the cavity is not communicated with the mold cavity;

the water cooling block is arranged in the cavity, an arc-shaped water channel is processed in the water cooling block, the arc-shaped water channel forms a circular ring surrounding the die cavity, and the arc-shaped water channel is not communicated with the cavity;

processing blind holes on one side surface of the water cooling block facing to the mold cavity, wherein the blind holes are not communicated with the arc-shaped water channel, the positions of the blind holes correspond to the positions of the hot junctions one by one, and the number of the blind holes is equal to that of the hot junctions; and red copper inserts are embedded in the blind holes.

2. The low-pressure casting die for the wheel as claimed in claim 1, wherein a water inlet hole and a water outlet hole are formed on the outer side surface of the water cooling block, and a water inlet pipe joint and a water outlet pipe joint are welded correspondingly, the water inlet pipe joint and the water outlet pipe joint are communicated with external water cooling equipment to form a cooling water circulation passage.

3. The low-pressure casting die for the wheel as claimed in claim 1, wherein the hole diameter size of the blind holes and the size of the red copper inserts are adjusted according to the size of a wheel hot spot area, and the number of the blind holes and the red copper inserts are consistent with that of spokes.

4. The low pressure casting mold for a wheel according to claim 1, wherein the upper and lower sides of the cavity are flat heat conducting surfaces; the upper side and the lower side of the water cooling block are flat heat conducting surfaces; the upper side and the lower side of the cavity are matched with the upper side and the lower side of the water cooling block to form a heat transfer structure.

5. The low-pressure casting die for the wheel as claimed in claim 4, wherein the flat heat-conducting surface has a surface roughness Ra < 1.6.

6. A low pressure casting mold for a wheel as claimed in claim 1, wherein said water cooled block is removably and fixedly mounted within said cavity.

7. The low pressure casting mold for a wheel according to claim 1, wherein the arc-shaped water passage has a U-shaped cross section, and both ends of the arc-shaped water passage are welded and sealed by a baffle plate.

8. The low-pressure casting die for the wheel as claimed in claim 1, wherein the side die frame and the water cooling block are made of steel 35CrMo, the side die frame is integrally formed by casting, and the water cooling block is formed by forging.

9. The low pressure casting mold for a wheel according to claim 1, wherein the end of the arcuate channel is less than 20mm from the side mounting surface, and the end of the blind hole is 5-10mm from the cavity surface of the arcuate channel.

10. A low pressure casting mold for a wheel according to any one of claims 1 to 9, wherein the water cooled block is curved at the front and rear sides thereof, and the water cooled block is closely attached to the inner wall of the cavity.