CN204685968U - Automobile differential housing casting sand core - Google Patents

Abstract

The utility model discloses a casting sand core for an automobile differential case. During the pouring operation of the automobile differential case, the sand core is placed on a sand mold made by the mold of the automobile differential case. In the cavity of the automobile differential housing, it is characterized in that: the sand core is provided with an ingate channel, one end of the ingate channel communicates with the riser cavity, and the other end of the ingate channel communicates with the The cavities of the automobile differential case are connected. The casting sand core of the automobile differential gear housing provided by the utility model adopts the method of making an inner gate channel on the sand core, opens up the inner wall and the outer wall of the sand core, and makes the riser cavity and the automobile through the channel on the sand core. The cavity of the differential case is connected, so that the ingate can be arranged at other parts except the flange, so as to effectively increase the feeding effect of the riser cavity and improve the quality of the differential case of the automobile.

Description

Casting sand core for automobile differential case

technical field

The utility model relates to an improvement of the sand mold structure of the automobile differential casing. With the improvement, the gate position in the automobile differential casing can be set at a non-flange position, thereby improving the quality of the automobile differential casing.

Background technique

The difference in the position of the gate in the differential housing of the automobile directly determines the quality of the differential housing product, especially the size of the internal defects of the differential housing product. The quality of the differential housing will affect the service life and safety of the car. Under the current production conditions of sand cores, products like the differential case with a cavity in the middle, a thin cavity wall, and a large flange position (usually greater than 150mm), but the thickness is only about 10mm, the inner casting The mouth will be set on the flange, but this setting is not conducive to the feeding of the entire product by the riser, and it is easy to cause one side of the product to have no internal defects, while the other side has internal defects, or even both sides have internal defects.

Contents of the invention

In view of the above-mentioned problems in the prior art, the purpose of this utility model is to improve the sand core structure of the automobile differential case, so that the setting position of the gate in the differential case can be improved, thereby effectively increasing the feeding of the riser The effect is to improve the quality of the differential case.

The purpose of this utility model adopts following technical scheme to realize:

A casting sand core for an automobile differential case, the sand core is placed in the sand mold of the automobile differential case made by the mold of the automobile differential case during the pouring operation of the automobile differential case In the housing cavity, it is characterized in that: the sand core is provided with an ingate channel, one end of the ingate channel communicates with the riser cavity, and the other end of the ingate channel communicates with the automobile differential case The body cavities are connected.

Further, the ingate channel is arranged on the sand core at a position corresponding to the non-flange surface of the cavity of the automobile differential case.

Preferably, the ingate channel is arranged on the sand core at a position on the transmission gear surface corresponding to the cavity of the automobile differential case.

The size of the ingate channel on the sand core is obtained by the following formula:

Ingate channel cross-sectional area = A×B/{2×(A+B)-C}×D×4

In the above formula: A is the length of any side of the model obtained according to the process of cooling the casting from high temperature to normal temperature during casting, B is the length of the other side of the model obtained according to the process of cooling from high temperature to normal temperature during casting casting, and C is based on the length of the casting The length of the uncooled side of the model obtained from the process of cooling from high temperature to normal temperature during casting, D is a coefficient of 0.4 to 0.6.

The casting refers to the automobile differential case.

The casting sand core of the automobile differential housing provided by the utility model changes the traditional mold technology that the inner gate of the automobile differential housing must be arranged on the flange and the inner gate is in direct contact with the product. The inner gate channel is made on the sand core, the inner wall and the outer wall of the sand core are opened, and the cavity of the riser is connected with the cavity of the automobile differential case through the channel on the sand core, so that the inner gate can be opened. It is arranged on other parts except the flange, so as to effectively increase the feeding effect of the riser cavity and improve the quality of the automobile differential case.

Description of drawings

Fig. 1 is the front view of the sand core structure of the embodiment of the utility model;

Fig. 2 is a sectional view of Fig. 1A-A;

Fig. 3 is a schematic diagram of the combination of the riser cavity and the automobile differential housing cavity of the embodiment of the utility model;

Fig. 4 is Fig. 5 A-A to sectional view;

Fig. 5 is a front view of the housing structure of the automobile differential according to the embodiment of the utility model;

Fig. 6 is a side view of the housing structure of the automobile differential according to the embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the specific embodiment of the present utility model is further described:

Please refer to the sand core 1 structure shown in Fig. 1 and Fig. 2. When the automobile differential case 4 is poured, the sand core 1 is placed in the automobile differential case cavity 3, and the automobile differential case The body cavity 3 is made by the mold of the automobile differential housing 4 . The sand core 1 is provided with a sand injection port 11, a positioning head 12, and an ingate channel 13. One end of the ingate channel 13 communicates with the riser cavity 2, and the other end of the ingate channel 13 communicates with the differential speed of the vehicle. The housing cavity 3 is connected with each other, and the molten iron passes through the riser cavity 2, and then passes through the ingate channel 13 to reach the automotive differential housing cavity 3. The combination of riser cavity 2 and automotive differential housing cavity 3 is shown in Figure 3 and Figure 4.

The ingate channel 13 is arranged on the non-flange surface of the sand core 1 corresponding to the cavity 3 of the automobile differential case.

Preferably, the ingate channel 13 is arranged on the sand core 1 at the position corresponding to the transmission gear surface 31 of the cavity 3 of the automobile differential case.

5 and 6 are schematic diagrams of the structure of the automobile differential case 4, which includes a flange 41, a transmission gear surface 42, a gear shaft fixing hole 43, and a bolt fixing hole 44. When the ingate channel 13 is arranged on the sand core 1 corresponding to the transmission gear surface 31 of the automobile differential case cavity 3, the ingate 45 during pouring of the automobile differential case 4 can be located at the position of the automobile differential case. On the transmission gear surface 42 of the body 4.

The size of the ingate channel 13 on the sand core 1 is the same as the size of the channel between the riser and the automobile differential case 4 after pouring is completed. The relationship between the size of the gate passage 13 and the automobile differential housing 4 is as follows:

Cross-sectional area of gate channel 13 = A×B/{2×(A+B)-C}×D×4

In the above formula: A is the length of any side of the model obtained according to the process of cooling the casting from high temperature to normal temperature during pouring, B is the length of the other side of the model obtained according to the process of cooling from high temperature to normal temperature during casting, and C is based on the length of the casting The length of the uncooled side of the model obtained from the process of cooling from high temperature to normal temperature during casting, D is a coefficient of 0.4 to 0.6. The casting refers to the automobile differential case 4 .

In this embodiment, A=5, B=4, C=7, D=0.5, then

Cross-sectional area of gate channel 13 = 5×4/{2×(5+4)-7}×0.5×4=3.6

Claims (4)

1. A casting sand core for an automobile differential case, when the pouring operation of the automobile differential case, the sand core is placed on the sand mold of the automobile differential case made by the mold of the automobile differential case In the cavity of the gearbox housing, it is characterized in that: the sand core is provided with an ingate channel, one end of the ingate channel communicates with the riser cavity, and the other end of the ingate channel communicates with the vehicle differential speed The housing cavity is connected. 2. The sand core for casting the automobile differential case according to claim 1, characterized in that: the ingate channel is arranged on the sand core corresponding to the non-flange of the automobile differential case cavity face position. 3. The sand core for casting the automobile differential case according to claim 1, characterized in that: the ingate channel is arranged on the sand core corresponding to the transmission gear of the cavity of the automobile differential case face position. 4. The casting sand core for automobile differential case according to claim 1, characterized in that: the size of the ingate channel on the sand core is obtained by the following formula: Ingate channel cross-sectional area = A×B/{2×(A+B)-C}×D×4 In the above formula: A is the length of any side of the model obtained according to the process of cooling the casting from high temperature to normal temperature during pouring, B is the length of the other side of the model obtained according to the process of cooling from high temperature to normal temperature during casting, and C is based on the length of the casting The length of the uncooled side of the model obtained from the process of cooling from high temperature to normal temperature during casting, D is a coefficient of 0.4 to 0.6.