Differential mechanism shell casting process

A differential housing and casting process technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of inability to guarantee the shape and position accuracy of the four cross shaft holes, low machining accuracy, and wear of boring tools. Achieve the effect of solving shrinkage cavity and shrinkage defects, reducing the amount of machining and cutting, and avoiding the formation of hot spots

Active Publication Date: 2015-02-18
长春一汽四环金仑汽车零部件有限公司
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AI-Extracted Technical Summary

Problems solved by technology

[0004] But the applicant of the present invention finds through long-term practice the casting process of above-mentioned heavy-duty monolithic differential case, as attached figure 1 And attached figure 2 The heavy-duty one-piece differential case shown in , which includes the differential case 01 and the shaft hole seat 02, because the cross shaft hole is not cast out, 4 huge thermal joints are formed on the differential case, which brings great pressure to the casting. Come adverse effects, the disadvantages are:
[0005] 1. The shaft hole seat 02 on the differential case 01 has the thickest thickness because there is no cross shaft hole cast there, and there are generally four shaft hole seats 02 on the differential case 01, so when casting 4 huge thermal knots (as attached figure 2 The dotted ring in the center), shrinkage cavity and shrinkage defects are easily formed at the hot joint, which affects the quality of the casting;
[0006] 2. Due to the above-mentioned shrinkage cavity and shrinkage defect at the hot joint, it is easy to drill off the center when drilling the cross-axis hole, which cannot guarantee the shape and position accuracy of the four cross-axis holes, and the drill bit is easily broken. At t...
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Abstract

The invention provides a differential mechanism shell casting process which has the benefits that the hot section formation can be avoided, the shrinkage porosity and shrinkage cavity defects are overcome, the quality of castings is ensured, the large surface hardness fluctuation of a planet wheel machining spherical surface in contact with cold iron caused by the use of the cold iron is avoided, and the influence on follow-up machining is small; the drilling procedures are eliminated, and a rough boring-fine boring process is directly adopted, so that the cutting quantity is greatly reduced, and the processing efficiency is improved. The differential mechanism shell casting process comprises the following steps: 1, making a sand core main body (1) by adopting a core making machine, wherein the sand core main body (1) adopts an integral structure with a cast hole sand column (2) for casting a cross-shaped shaft hole in a differential mechanism shell; 2, drying the sand core main body (1) in the step 1; 3, putting the sand core main body (1) dried in the step 2 in upper and lower molds of the differential mechanism shell and then casting the molds according to conventional casting processes; 4, finally, opening the molds to obtain the differential mechanism shell (4) with the cross-shaped shaft hole.

Application Domain

Foundry mouldsMoulding machines +2

Technology Topic

HardnessShrinkage porosity +4

Image

  • Differential mechanism shell casting process
  • Differential mechanism shell casting process
  • Differential mechanism shell casting process

Examples

  • Experimental program(1)

Example Embodiment

[0033] The present invention will be further described in detail below in conjunction with the drawings.
[0034] Attached image 3 To attach Picture 9 , A differential case casting process, which includes the following steps:
[0035] 1. Using a core making machine, a sand core body 1 is produced. The sand core body 1 is an integrated structure with a cast hole sand column 2 for casting a cross shaft hole on the differential case;
[0036] 2. Dry the sand core body 1 described in step one;
[0037] 3. Place the sand core body 1 after drying in step 2 in the upper and lower molds of the differential housing, and then cast the molds according to the conventional casting process;
[0038] 4. Finally, the mold is opened to obtain a differential housing 4 with a cross shaft hole 6.
[0039] Preferably, the core-making machine is a core-shooting machine that uses a hot-box process to make a coated sand core.
[0040] The conventional casting method mentioned in the present invention refers to the general casting method that has now been disclosed. For example, a representative patent application in the prior art, the patent application number is 201210296150.2, and the patent name is: sand-coated casting with metal mold The casting method disclosed in the casting mold of the automobile differential housing and the casting method. The conventional steps such as heating, sand shooting, and casting disclosed therein are applicable to the present invention, but the sand core used in the present invention is essentially different from the sand core disclosed therein. Attached image 3 To attach Picture 9 Reference signs in: 1. Sand core body, 2. Cast hole sand column, 3. Sand core profile, 4. Differential housing, 5. Shaft hole seat, 6. Cross shaft hole. Used to assist the user as a reference for the naming and positioning of various components during implementation. Users can also mark each part according to their own work habits.
[0041] The present invention and its embodiments are described above, and the description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited to this. All in all, if a person of ordinary skill in the art is inspired by it, and without departing from the inventive purpose of the present invention, without creative design, structural modes and embodiments similar to the technical solution shall fall within the protection scope of the present invention.

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