CN212121592U - Casting mould of air condition compressor bearing foundry goods - Google Patents

Abstract

A casting mould of an air conditioner compressor bearing casting comprises a first template and a second template; the first template is provided with a cavity, the second template is provided with a whole or partial casting channel, and the casting channel is communicated with the cavity after the first template is buckled with the second template. Use the casting mould of air condition compressor bearing foundry goods effectual with heat dispersion to two templates in casting process for the radiating rate in the casting process obtains very big promotion, the foundry goods high quality of production, loose part does not appear in foundry goods internal diameter heat junction, the foundry goods of production accords with the requirement for the quality of foundry goods, adapts to completely and intelligent processing.

Description

Casting mould of air condition compressor bearing foundry goods

Technical Field

The utility model relates to a casting mould especially relates to a casting mould suitable for perpendicular mo (u) lding line production air condition compressor bearing foundry goods of DISA.

Background

At present, most domestic air-conditioning compressors adopt a rotor air-conditioning compressor structure, the air-conditioning compressor structure mainly comprises an upper bearing, an air cylinder, a lower bearing and an eccentric crankshaft, and the structural design and the principle of a casting are basically the same. The main quality requirements of the casting are as follows: the gray cast iron casting is made of HT250, and the basic requirements are as follows: the content of the main pearlite is more than or equal to 95 percent, A-type graphite is used as a main material, the length of the graphite is controlled to be 4-6 levels, macroscopic loosening or shrinkage cavities cannot be allowed to occur in the bearing shaft, the hardness of a casting needs to be uniformly distributed, and cementite cannot be allowed to occur in the casting process. As the single weight of a bearing casting is between 0.3 and 1.5Kg, the design quantity of mould shaping plates is between 10 and 40 pieces/mould, and the diameter of the inner diameter of a bearing shaft is generally between phi 10 and 20mm, the existing casting process mainly adopts solid casting, and subsequent processing such as drilling, turning and the like is carried out after the casting is obtained.

Modern air conditioning compressor iron castings are mostly prone to lightweight structural designs, resulting in a corresponding increase in the hot junction of the casting. Referring to fig. 1, a part a in the drawing is a hot junction part of the bearing casting, and in the casting process of the bearing casting, the axis part of the casting is finally cooled, which easily causes a quality problem of the casting at the hot junction, causes unstable machining size of the casting, and affects the performance of the air conditioner compressor.

Referring to fig. 2, fig. 2 is a schematic view of a conventional casting mold for bearing castings. As shown, the conventional casting mold for bearing casting adopts a conventional edge-to-edge water inlet mode, and the cavity 10 and the main casting channel 20 including the sprue 21, the runner 22, the ingate 23 and the ingate 24 are placed on the same template, and the other template is almost a light plate. Wherein a bearing casting is cast in the cavity 10, and molten iron is injected into the cavity 10 through the pouring passage 20. When the casting mold is used for mass production of bearing castings, the castings are poor in heat dissipation effect, so that graphitization and expansion can be caused when the castings are solidified. In addition, because the cavity adopts traditional limit of connecing mode of intaking to intake, the ingate can not in time be closed, and the molten iron refluence forms anti-feeding and contracts, leads to the foundry goods hot junction will appear shrinkage cavity or quality problems such as loose, causes the foundry goods internal diameter loose, and the loose situation appears in the couple of hair axis internal diameter that can appear, and the hardness that further leads to the foundry goods simultaneously is low, and foundry goods machining size precision is low.

At present, the production of domestic air conditioner compressor castings mostly uses a DISA vertical moulding line, the production speed is as high as 550 types/hour, and if the quality guarantee coefficient of a mould design is low, batch waste products are produced, and a large amount of loss is caused. When the existing traditional mold is used for casting, waste products with problems of shrinkage cavities or looseness and the like at the hot junction of the casting can be produced in batches, and improvement is needed.

With regard to the details of the loose part of the hot junction of the casting cast by using the conventional casting mold, please refer to fig. 3-5 together, fig. 3 is a schematic diagram of the macro topography of the loose part of the casting, where B is the loose part, fig. 4 is a metallographic examination diagram of the loose part of the casting, and fig. 5 is a 500-fold enlarged view of the loose part of the casting. Metallographic detection is carried out on the loose part, and the loose part C is mainly E-type dendritic graphite which does not meet the quality requirement of the casting and is surrounded by A-type flaky graphite which meets the requirement; the loose part is amplified by 500 times, and the D part is phosphorus eutectic, and the E part is nonmetallic inclusion, so that the nonmetallic inclusion caused by insufficient feeding during the solidification of the casting is more, and the casting quality is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the shortcoming and not enough among the prior art, provide a but casting mould of casting high quality, hot junction portion no loose air condition compressor bearing foundry goods.

A casting mould of an air conditioner compressor bearing casting comprises a first template and a second template; the first template is provided with a cavity, the second template is provided with a whole or partial casting channel, and the casting channel is communicated with the cavity after the first template is buckled with the second template.

Use the casting mould of air condition compressor bearing foundry goods effectual with heat dispersion to two templates in casting process for the radiating rate in the casting process obtains very big promotion, the foundry goods high quality of production, loose part does not appear in foundry goods internal diameter heat junction, the foundry goods of production accords with the requirement for the quality of foundry goods, adapts to completely and intelligent processing.

Further, when a part of the casting channels are arranged on the second template, the rest of the casting channels are arranged on the first template.

Further, the casting channel comprises a sprue, a cross gate, an ingate and an ingate, the sprue, the cross gate, the ingate and the ingate are sequentially communicated after the first template is buckled with the second template, and the cavity is communicated with the ingate through the ingate.

Further, the cross runner is arranged on the first template; the sprue, the ingate and the ingate are arranged on the second template. Molten iron flows in the two templates in an inserting mode in the casting process, so that the whole heat dissipation area is increased, the heat dissipation condition of the casting is better, and heat dissipation is facilitated.

Further, after the first mold plate and the second mold plate are buckled, the opening direction of the sprue gate is upward, and the water inlet of the cavity faces upward and is communicated with the inner sprue gate. Molten iron is injected into the cavity from top to bottom, so that resistance can be formed on graphitization expansion pressure during casting, and loose parts of castings are further prevented.

Furthermore, the water inlet of the cavity is connected with the inner sprue in a blank pressing mode. The edge pressing design at the water inlet of the casting can quickly cut off the reverse feeding of the casting, and further guarantee the consistency of the internal structure of the casting.

Furthermore, the thickness of the blank holder of the water inlet is 1.2-1.5 mm.

Furthermore, the number of the cavities is multiple, and the cavities are dispersedly arranged on the first template. And a plurality of cavities are arranged simultaneously, so that a plurality of castings can be cast simultaneously, and the casting efficiency is improved.

Furthermore, after the first template and the second template are buckled, a sprue gate of the sprue is positioned in the middle of the top end of the buckled template, a channel in the sprue gate is vertically downward, and two sides of the lower end of the sprue gate are respectively provided with a cross gate perpendicular to the direction of the sprue gate; one ends of the transverse pouring channels, which are not connected with the straight pouring channels, are respectively connected with one inner pouring channel, and the inner pouring channels are arranged perpendicular to the transverse pouring channels; the cavities are arranged on two sides of each ingate and communicated with the ingates through the ingates. The reasonable layout is used, a plurality of castings can be produced by pouring once, the technological yield is greatly improved, and large-scale batch production is convenient to realize.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic view of a bearing casting construction;

FIG. 2 is a schematic view of a conventional casting mold for bearing castings;

FIG. 3 is a schematic diagram of the macro-topography of the loose part of the casting;

FIG. 4 is a metallographic examination of the loose portion of the casting;

FIG. 5 is a 500-fold enlargement of a loose portion of a casting;

FIG. 6 is a schematic view of a first mold plate of the novel bearing casting mold;

FIG. 7 is a schematic view of a second mold plate of the novel bearing casting mold;

fig. 8 is a schematic view of the casting channel after the first mold plate and the second mold plate are combined.

In the figure:

a cavity 10; a casting channel 20; a sprue 21; a runner 22; an ingate 23; the in-gate 24.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Research shows that when the traditional mold is used for casting, the heat is almost completely concentrated on the mold plate where the cavity is located, and the heat dissipation can be carried out only by the single mold plate. The heat is too concentrated, and the heat dissipation space is small, so the heat dissipation effect is extremely poor. The utility model discloses a right die cavity 10 with the adjustment of the distribution position of casting passageway 20 in two templates, the heat dispersion when successful will casting is on two templates, and the heat is effectual accelerated radiating speed in the time of more dispersion for the radiating effect in the casting process promotes by a wide margin, has promoted the quality of foundry goods greatly.

Referring to fig. 6 and 7, fig. 6 is a schematic diagram of a first mold plate of the novel bearing casting mold, and fig. 7 is a schematic diagram of a second mold plate of the novel bearing casting mold. As shown in fig. 6 and 7, the casting pattern plate used in the present invention includes a first pattern plate and a second pattern plate, and the second pattern plate can be fastened to the first pattern plate to form a parting surface. Wherein a plurality of the cavities 10 and the cross runners 22 in the casting channel 20 are arranged on the first template; the second mold plate is provided with the sprue 21, the ingate 23 and the ingate 24 in the casting channel 20.

The casting channel 20 is communicated with each other after the first template and the second template are buckled, the sprue 21 is communicated with the runner 22, one end of the ingate 23 is communicated with the runner 22, the other end of the ingate is communicated with the cavity 10 through the ingate 24, the number of the ingates 24 is the same as that of the cavities 10, each cavity 10 is communicated with 1 ingate 24, and the communication part of the ingate 24 and the cavity 10 of the bearing casting is arranged at the upper half part of the casting. The opening formed in the cavity 10 and used for being communicated with the inner sprue 24 is a water inlet, the connection mode of the water inlet and the inner sprue is a blank pressing mode, a blank pressing water inlet mode is adopted, and the thickness of the blank pressing is 1.2-1.5 mm.

Specifically, in the present embodiment, please refer to fig. 8, and fig. 8 is a schematic diagram of a casting channel after the first mold plate and the second mold plate are spliced together. The sprue 21 is positioned in the middle of the top end of the fastened template, and an internal channel is vertically downward; two cross runners 22 perpendicular to the sprue 21 are connected to two sides of the lower end of the sprue 21; one ends of the two cross runners 22, which are not connected with the straight runners 21, are respectively connected with an ingate 23, and the ingate 23 is perpendicular to the cross runners 22; the plurality of cavities 10 are arranged on both sides of each ingate 23 and communicated with the ingates 23 through the ingates 24. In this embodiment, two sides of each ingate are respectively provided with 3 cavities, and a total of 12 cavities 10 are provided.

During casting, molten iron is injected from the sprue gate, sequentially passes through the sprue 21, the cross gate 22, the ingate 23 and the ingate 24, enters the cavity 10 through the water inlet until the mold is filled with the molten iron, and is demoulded after the molten iron in the mold is cooled and solidified, so that the bearing casting of the air conditioner compressor can be obtained.

In the casting process, a casting mold obtained by splicing the first template and the second template is used for pressure pouring, and the pressure forms back pressure resistance to the graphitized expansion force when the casting is solidified, so that the compactness consistency of the internal structure of the casting is ensured; the upward movement of the inner sprue 24 can enable the casting to form resistance to graphitization expansion pressure when the casting is solidified, so that a loose part of the casting is prevented; the casting channels 20 are dispersedly arranged on the first template and the second template, so that the heat distribution ratio of molten iron on a sand mold formed by the first template and the second template is about 3:2, the heat dissipation condition of a casting is changed, and the heat dissipation speed in the casting process is greatly increased; during casting, edge pressing is adopted for water inflow, the thickness of the edge pressing of the water inlet is 1.2-1.5mm, and the edge pressing design at the water inlet of the casting can quickly cut off reverse feeding of the casting, so that the consistency of internal tissues of the casting is further ensured. The yield of the process design of the mold according to this embodiment can reach 60%, where the process yield is (single weight of the casting × number)/total weight of molten iron used for pouring, that is, the mass of the casting produced in the casting process accounts for 60% of the weight of the used material.

Use the utility model provides a mould pours into a mould, produces a large amount of gained bearing foundry goods internal diameter heat junction department does not appear loosely, accords with the requirement for quality to the foundry goods, has adapted to intelligent processing completely, has thoroughly solved the loose difficult problem of air condition compressor bearing internal diameter. Meanwhile, the hardness and the machining size precision of the casting are improved, and the quality of the casting is integrally improved.

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.

Claims (9)

1. The utility model provides a casting mould of air condition compressor bearing foundry goods which characterized in that: comprises a first template and a second template; the first template is provided with a cavity, the second template is provided with a whole or partial casting channel, and the casting channel is communicated with the cavity after the first template is buckled with the second template.

2. The casting mold of a bearing casting of an air conditioner compressor as recited in claim 1, wherein: when the second template is provided with a part of casting channels, the rest part of casting channels are arranged on the first template.

3. The casting mold of the air condition compressor bearing casting according to claim 2, wherein: the casting channel comprises a sprue, a cross gate, an ingate and an ingate, the sprue, the cross gate, the ingate and the ingate are sequentially communicated after the first template is buckled with the second template, and the cavity is communicated with the ingate through the ingate.

4. The casting mold of a bearing casting of an air conditioner compressor as claimed in claim 3, wherein: the cross gate is arranged on the first template; the sprue, the ingate and the ingate are arranged on the second template.

5. The casting mold of a bearing casting of an air conditioner compressor as claimed in claim 3, wherein: after the first template and the second template are buckled, the opening direction of the sprue gate is upward, and the water inlet of the cavity faces upward and is communicated with the inner sprue gate.

6. The casting mold of a bearing casting of an air conditioner compressor as claimed in claim 3, wherein: and the water inlet of the cavity is connected with the inner sprue in a blank pressing manner.

7. The casting mold of a bearing casting of an air conditioner compressor as recited in claim 6, wherein: the thickness of the blank holder of the water inlet is 1.2-1.5 mm.

8. The casting mold of a bearing casting of an air conditioner compressor as claimed in claim 7, wherein: the number of the cavities is multiple, and the cavities are dispersedly arranged on the first template.

9. The casting mold of a bearing casting of an air conditioner compressor as recited in claim 8, wherein: after the first template and the second template are buckled, a sprue gate of the sprue gate is positioned in the middle of the top end of the buckled template, a channel in the sprue gate is vertically downward, and two sides of the lower end of the sprue gate are respectively provided with a cross gate perpendicular to the direction of the sprue gate; one ends of the transverse pouring channels, which are not connected with the straight pouring channels, are respectively connected with one inner pouring channel, and the inner pouring channels are arranged perpendicular to the transverse pouring channels; the cavities are arranged on two sides of each ingate and communicated with the ingates through the ingates.

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