False core manufactured in split mode and used in combined mode

Abstract

A false core manufactured in a split mode and used in a combined mode comprises a false core upper portion, a false core middle portion and a false core lower portion. The false core middle part is arranged below the false core upper part; the false core lower part is arranged below the false core middle part; wherein the false core upper part and the false core lower part are pressed through an independent mold, the cooled false core lower part is put into the mold of the false core middle part to press the false core middle part, the false core lower part and the false core middle part form a combined body, and the cooled combined body of the false core lower part and the false core middle part is put into the mold of the false core; and putting the cooled upper part of the false core, and pressing to form a complete false core. According to the utility model, the original integrated false core design is changed into the false core upper part, the false core middle part and the false core lower part which are combined for use, so that the problem of unstable size of a large false core monomer design can be eliminated, the size of the large false core is stabilized, and the scrapping of a wax mould caused by the size problem is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of investment casting, in particular to a false core which is manufactured separately and used in combination. Background Art

[0002] Turbochargers are used in gasoline and diesel internal combustion engines. With the increase in the weight and volume of the turbocharger turbine, the usual false core design can no longer meet the dimensional requirements of production, and it has the following problems:

[0003] According to the traditional false core design, the volume and weight of the wax pattern false core itself are too large. Due to volume shrinkage, its own dimensions are unstable, and finally the dimensions of the wax pattern produced using the false core are also unstable, ultimately causing the wax pattern to exceed the dimensional tolerance and resulting in the scrapping of the wax pattern; if the volume of the wax pattern false core is designed too small, its own dimensions are stable, but it cannot play the role of supporting the wax pattern, causing the dimensions of the wax pattern to exceed the dimensional tolerance requirements and resulting in the scrapping of the wax pattern. When the volume of the false core itself increases to a certain extent, the dimensions of the false core will fluctuate greatly. At this time, if the traditional false core design is still used, the dimensions of the pressed wax pattern will be unstable.

[0004] Therefore, we propose a false core which is manufactured separately and used in combination. Summary of the Utility Model

[0005] The applicant of the present utility model aims at the above-mentioned shortcomings in the existing production technology and provides a false core which is manufactured separately and used in combination, thereby changing the original integral false core design into a design of three parts: the upper part 1 of the false core, the middle part 2 of the false core, and the lower part 3 of the false core, and then using them in combination, which can eliminate the problem of unstable dimensions in the single design of large false cores, stabilize the dimensions of large false cores, and reduce the scrapping of wax patterns caused by dimensional problems.

[0006] The technical solution adopted by the present utility model is as follows:

[0007] A false core which is manufactured separately and used in combination, comprising:

[0008] The upper part of the false core;

[0009] The middle part of the false core, which is arranged below the upper part of the false core;

[0010] The lower part of the false core, which is arranged below the middle part of the false core;

[0011] Wherein, the upper part of the false core and the lower part of the false core are pressed by separate molds. After the cooled lower part of the false core is placed in the mold of the middle part of the false core to press the middle part of the false core, the lower part of the false core and the middle part of the false core form a combined body. The combined body of the cooled lower part of the false core and the middle part of the false core is placed in the mold of the false core, and then the cooled upper part of the false core is placed in for pressing to form a complete false core.

[0012] Its further features are as follows:

[0013] The upper part, middle part, and lower part of the dummy core are all made by pressing wax.

[0014] The upper part of the dummy core is divided into two parts. One part is pressed separately, and after cooling, it is placed in the mold of the upper part of the dummy core for pressing the other part of the upper part of the dummy core, so as to stabilize the size of the upper part of the dummy core.

[0015] The lower part of the dummy core is divided into two parts. One part is pressed separately, and after cooling, it is placed in the mold of the lower part of the dummy core for pressing the other part of the lower part of the dummy core, so as to stabilize the size of the lower part of the dummy core.

[0016] The beneficial effects of the present utility model are as follows:

[0017] The structure of the present utility model is compact and reasonable, and it is convenient to operate. The original integrated dummy core design is changed to a design of three parts: the upper part of the dummy core, the middle part of the dummy core, and the lower part of the dummy core, and then they are combined for use, which can eliminate the problem of unstable size of the large dummy core in the single design, stabilize the size of the large dummy core, and reduce the scrapping of the wax mold caused by size problems; first press the lower part of the dummy core, and then press the upper part of the dummy core; after the lower part of the dummy core is cooled, place the lower part of the dummy core in the mold of the middle part of the dummy core to press the middle part of the dummy core, so that the lower part of the dummy core and the middle part of the dummy core form a whole; after the combination of the lower part of the dummy core and the middle part of the dummy core is cooled, place it in the mold, and then place the upper part of the dummy core on the combination of the lower part of the dummy core and the middle part of the dummy core to form a complete dummy core.

[0018] At the same time, the present utility model also has the following advantages:

[0019] (1) When the sizes of the upper part and the lower part of the dummy core are large, the upper part and the lower part of the dummy core can be divided into two sections or multiple sections for pressing and assembling to ensure the stable sizes of the upper part and the lower part of the dummy core. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model.

[0021] Figure 2 is a schematic diagram of the upper part of the dummy core of the present utility model.

[0022] Figure 3 is a schematic diagram of the lower part of the dummy core of the present utility model.

[0023] Wherein: 1. Upper part of the dummy core; 2. Middle part of the dummy core; 3. Lower part of the dummy core. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following combines the drawings to illustrate the detailed embodiments of the present utility model.

[0025] As Figures 1 - 3As shown, a split-made and combined false core includes an upper part 1 of the false core, a middle part 2 of the false core, and a lower part 3 of the false core.

[0026] When designing the false core, the structure of the false core is redesigned. The original integral false core is divided into three parts: the upper part 1 of the false core, the middle part 2 of the false core, and the lower part 3 of the false core. First, the upper part 1 of the false core and the lower part 3 of the false core are pressed, then the upper part 1 of the false core and the lower part 3 of the false core are cooled. Then, the lower part 3 of the false core is put into the mold of the middle part 2 of the false core for secondary wax pressing. In this way, the lower part 3 of the false core and the middle part 2 of the false core form a combined body. The combined body formed by the lower part 3 of the false core and the middle part 2 of the false core is put into the false core mold, and then the upper part 1 of the false core is put into the false core mold for pressing, so as to form a complete false core, which can reduce the volumetric shrinkage of the whole false core, stabilize the size of the false core, and finally reduce the size rejection of the wax mold.

[0027] The original integral false core is divided into three parts. The upper part 1 of the false core and the lower part 3 of the false core are first pressed with independent molds. Then, the cooled lower part 3 of the false core is put into the mold of the middle part 2 of the false core to press the middle part 2 of the false core, so that the lower part 3 of the false core and the middle part 2 of the false core become a whole with stable size. The upper part 1 of the false core, the middle part 2 of the false core, and the lower part 3 of the false core are combined into a complete false core and put into the mold for use.

[0028] The original integral false core design is changed to the design of three parts: the upper part 1 of the false core, the middle part 2 of the false core, and the lower part 3 of the false core, and then they are combined for use, which can eliminate the problem of unstable size of the large false core monomer design, stabilize the size of the large false core, and reduce the rejection of the wax mold caused by size problems. First, the lower part 3 of the false core is pressed, and then the upper part 1 of the false core is pressed. After the lower part 3 of the false core is cooled, the lower part 3 of the false core is put into the mold of the middle part 2 of the false core to press the middle part 2 of the false core, so that the lower part 3 of the false core and the middle part 2 of the false core form a whole. After the combined body of the lower part 3 of the false core and the middle part 2 of the false core is cooled, it is put into the mold, and then the upper part 1 of the false core is placed on the combined body of the lower part 3 of the false core and the middle part 2 of the false core to form a complete false core.

[0029] When the sizes of the upper part 1 of the false core and the lower part 3 of the false core are relatively large, the upper part 1 of the false core and the lower part 3 of the false core can be divided into two sections or multiple sections for pressing to ensure the stable sizes of the upper part 1 of the false core and the lower part 3 of the false core.

[0030] The above description is an explanation of the present utility model, not a limitation of the utility model. The scope defined by the present utility model can be seen in the claims. Within the protection scope of the present utility model, any form of modification can be made.

Claims

1. A fake core manufactured in parts and used in combination, characterized in that: include: The upper part of the false core (1); The dummy core middle part (2) is arranged below the dummy core upper part (1); The lower part of the dummy core (3) is arranged below the middle part of the dummy core (2); The upper part (1) and the lower part (3) of the dummy core are pressed by separate molds, and the cooled lower part (3) of the dummy core is placed in the mold of the middle part (2) of the dummy core to press the middle part (2) of the dummy core, so that the lower part (3) of the dummy core and the middle part (2) of the dummy core form a combined body, and the combined body of the cooled lower part (3) and the middle part (2) of the dummy core is placed in the mold of the dummy core, and then the cooled upper part (1) of the dummy core is placed in the mold to press the dummy core to form a complete dummy core.

2. A separately manufactured and combined dummy core as claimed in claim 1, characterized in that: The upper part (1) of the dummy core, the middle part (2) of the dummy core and the lower part (3) of the dummy core are all formed by pressing wax.

3. A separately manufactured and combined dummy core as claimed in claim 1, characterized in that: The dummy core upper part (1) is divided into two parts, one of which is pressed separately and then placed in a mold of the dummy core upper part (1) after cooling to press the other part of the dummy core upper part (1) so that the size of the dummy core upper part (1) is stable.

4. A separately manufactured and combined dummy core as claimed in claim 3, characterized in that: The dummy core lower part (3) is divided into two parts, one of which is pressed separately, and after cooling, is placed in a mold of the dummy core lower part (3) to press the other part of the dummy core lower part (3), so that the size of the dummy core lower part (3) is stable.

Images