Tool for reducing surface depression degree of wax piece

Abstract

The utility model discloses a tool for reducing the surface depression degree of a wax piece, which comprises a lower die and an upper die, the lower die is connected with the upper die, the lower die and the upper die are respectively provided with a groove A, the lower die is provided with a groove B, a groove C, a groove D, a groove E and a hole A, the groove A is connected with the groove B, the groove B is connected with the groove C, and the groove C is connected with the groove D. In the using process, the whole mold cavity is filled with wax liquid and then naturally cooled, and due to the fact that the cooling block is placed in the cooling process, the heat of the cooling block is lower than that of the mold, the cooling block can rapidly absorb heat, and the wax liquid around the cooling block is rapidly solidified. At the moment, the wax liquid far away from the cooling block is also rapidly cooled as far away from the hot spot. Therefore, the cooling speed of the whole wax piece flat plate is relatively close, surface depression caused by too large difference of internal and external cooling shrinkage rates is avoided, and a wax piece with a high surface degree is obtained.

Description

Technical Field

[0001] The utility model belongs to the technical field of flat wax piece preparation, and in particular relates to a tool for reducing the degree of concavity on the surface of a wax piece. Background Art

[0002] Thin-walled flat parts are usually milled by machine tools. If the castings need to be cast directly, it will be a huge challenge for traditional casting methods and require process innovation and improvement.

[0003] Flatness refers to the deviation of the macroscopic concave and convex height of the substrate from the ideal plane. It is an important indicator to measure whether a plane is flat. Since the cooling speed of the flat thin-walled parts is faster on the outside and slower on the inside, the unsolidified wax liquid will move to the outside, causing a depression in the middle. The common method to solve the depression of such parts in the current foundry is manual wax repair, but due to the different proficiency of workers, the temperature of the wax liquid used for manual wax repair is different from the original temperature of the wax parts, and the inability to apply pressure on manual wax repair. The flatness of the wax parts made by manual wax repair is always not comparable to that made by the wax injection machine. Therefore, a mold that does not require wax repair of the casting is needed to improve production efficiency and wax part quality.

[0004] The patent document with publication number CN103331413A discloses an automatic demoulding mold for adjusting plates, which solves the technical problem of automatic demoulding of thin-walled parts used for shrink nozzle parts of aircraft engines and ensures the required flatness of thin-walled parts. However, the mold fails to solve the technical problem of large difference in cooling shrinkage rate between the inside and outside of the flat plate structure of the wax part. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a tool for reducing the degree of depression on the surface of a wax part.

[0006] The utility model is realized through the following technical solutions.

[0007] The utility model provides a tool for reducing the concave degree of the wax part surface, comprising a lower die and an upper die, wherein the lower die and the upper die are connected, and grooves A are respectively arranged on the lower die, grooves B, grooves C, grooves D, grooves E and hole A are arranged on the lower die, and grooves A are connected to grooves B, grooves B and grooves C are connected, and grooves C and grooves D are connected.

[0008] Preferably, the groove A is fan-shaped at one end away from the groove B, the groove B is triangular, the groove B is connected to the groove A and the groove C by connecting the grooves A, two grooves D are symmetrically arranged in the groove C, and the groove E and the hole A are arranged at two locations on the lower mold.

[0009] Preferably, the groove D12 is in a truncated cone shape, a ceramic core is arranged at the bottom of the groove D, and a cooling block is arranged in the groove C.

[0010] Preferably, groove G, groove H and groove F are arranged on the upper mold, one end of groove G is connected to groove A, and the other end of groove G is connected to groove H, groove G is triangular, and groove F is arranged in groove H.

[0011] Preferably, a groove I is arranged in the groove H, and the groove I is connected to the groove F through a connecting groove.

[0012] Preferably, a hole B, a slot J and a slot K are provided on the upper die, two holes B, two slots J and two slots K are provided respectively, and the slots J and the slots K are provided on both sides of the upper die.

[0013] Preferably, a hole C is provided on the upper die, and the hole C is connected to the groove H.

[0014] Preferably, the ratio of the thickness of the cooling block to the thickness of the wax plate is greater than or equal to 0.5.

[0015] The beneficial effects of the utility model are:

[0016] During the use of the utility model, when the wax liquid fills the entire mold cavity, it will cool naturally. During the cooling process, since a cooling block is placed, the cooling block has a lower heat than the mold, so the cooling block will quickly absorb heat and the wax liquid around the cooling block will solidify quickly. At this time, the wax liquid far away from the cooling block is also quickly cooled because it is far away from the heat node. In this way, the cooling speed of the entire wax piece flat plate is relatively close, avoiding surface depression caused by a large difference in the cooling shrinkage rate inside and outside, and obtaining a wax piece with a higher surface finish. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the lower die of the utility model;

[0019] Figure 3 It is a structural schematic diagram of the upper die of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the ceramic core of the utility model;

[0021] In the figure: 1-lower mold, 11-slot C, 12-slot D, 13-slot E, 14-hole A, 15-connecting slot A, 16-ceramic core, 2-upper mold, 21-slot H, 22-slot F, 23-slot I, 24-connecting slot, 25-hole B, 26-slot J, 27-slot K, 28-hole C, 3-slot A, 4-slot B, 5-cooling block, 6-slot G. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0023] Example:

[0024] like Figures 1 to 4 As shown, a tool for reducing the degree of depression on the surface of a wax part comprises a lower mold 1 and an upper mold 2, wherein the lower mold 1 and the upper mold 2 are connected, and the lower mold 1 and the upper mold 2 are respectively provided with grooves A3, and grooves B4, grooves C11, grooves D12, grooves E13 and holes A14 are provided on the lower mold 1, wherein grooves A3 and grooves B4 are connected, grooves B4 and grooves C11 are connected, and grooves C11 and grooves D12 are connected. After the lower mold 1 and the upper mold 2 are closed, the two grooves A3 are combined to form a wax injection hole; grooves B4 and grooves G6 are combined to form a wax part pouring port; grooves C11 and grooves H21 are combined to form a casting groove for the flat plate part of the wax part, and grooves D12 are casting grooves for the convex part of the bottom of the wax part; holes A14 and holes B25 are arranged in corresponding positions and quantities, and bolts can be used to penetrate holes A14 and B25 at the same time to fasten the lower mold 1 and the upper mold 2; grooves E13 and grooves J26 are arranged in corresponding positions and quantities, and can be used for positioning.

[0025] The end of the groove A3 away from the groove B4 is fan-shaped to facilitate the injection of wax liquid. The groove B4 is triangular and is connected to the groove C11 through the connecting groove A15. Two grooves D12 are symmetrically arranged in the groove C11. The groove E13 and the hole A14 are arranged at two locations on the lower mold 1.

[0026] The groove D12 is in a truncated cone shape, and a ceramic core 16 is arranged in the groove D12. The ceramic core 16 is bilaterally symmetrical and has a Y-shaped structure to adapt to the shape of the later casting pipe. A cooling block 5 is arranged in the groove C11.

[0027] The upper mold 2 is provided with a groove G6, a groove H21 and a groove F22, one end of the groove G6 is connected to the groove A3, and the other end of the groove G6 is connected to the groove H21, the groove G6 is triangular, the groove F22 is arranged in the groove H21, a ceramic core 16 is arranged in the groove F22, one end of the two branches of the ceramic core 16 are respectively extended into the two grooves D12 for connection, and the other end of the ceramic core 16 is extended into the groove F22 for connection, the ceramic core 16 forms a Y-shaped casting flow channel in the wax part, and the ceramic core 16 is removed after the subsequent metal casting.

[0028] A groove I23 is arranged in the groove H21, and the groove I23 is connected to the groove F22 through the connecting groove 24, so that the wax liquid flows into the groove I23. A concave mold character insert can be arranged in the groove I23, so that corresponding convex characters exist on the wax piece flat plate.

[0029] The upper mold 2 is provided with a hole B25, a groove J26 and a groove K27, two of each of the hole B25, the groove J26 and the groove K27 are provided, and the groove J26 and the groove K27 are provided on both sides of the upper mold 2. The cross section of the groove K27 can be rectangular, which is convenient for demolding after the wax piece is prepared. When the wax piece is stuck to the mold, the mold can be lifted up by the lever principle through the groove of K27, and compressed air is blown to the connection between the mold and the wax piece to separate the wax piece from the mold.

[0030] The upper mold 2 is provided with a hole C28, which is connected to the groove H21. The hole C28 can be used for exhaust. The diameter of the hole C28 can be 1 mm, which is used to exhaust internal air during the waxing process to avoid the formation of bubbles on the surface of the wax blank.

[0031] The ratio of the thickness of the cooling block 5 to the thickness of the wax piece flat plate is greater than or equal to 0.5. The cooling block 5 is a cold iron core that can absorb heat, so that the solidification rate of the wax liquid at the heat concentration point is consistent with that of the outer surface, thereby preventing the formation of depressions. During the specific operation, first put the cooling block 5 into the mold, and put it close to the hot node. The hot node is the place where the heat storage capacity of the entire wax piece is the highest, that is, the part obtained by the wax piece through the groove D12, and then wax is injected, and the mold is taken after holding the pressure for 30-40s, and then it is put into water to cool for 60-80s before demolding. The cooling block 5 is taken out in the dewaxing process and can be reused.

[0032] The steps of using the mold include:

[0033] S1: Open the mold and separate it into a lower mold 1 and an upper mold 2, place a cooling block 5 in the groove C11, and put in a ceramic core 16;

[0034] S2: close the upper and lower molds 1 and the upper mold 2; inject wax liquid from the wax injection hole;

[0035] S3: Take out the wax parts after the wax liquid cools down.

[0036] The cooling block 5 is taken out in the subsequent dewaxing process of investment casting. The wax part needs to go through the shell making process before it is used in investment casting. After the shell making is completed, the whole wax part has been wrapped with a layer of shell. At this time, the whole wax part is placed in a vacuum dewaxing kettle, heated and pressurized, and the wax melts into wax water and flows out. The cooling block 5 is taken out from the film shell obtained by shell making through the gate.

Claims

1. A tool for reducing the degree of concavity on the surface of a wax part, characterized in that: The invention comprises a lower die (1) and an upper die (2), wherein the lower die (1) and the upper die (2) are connected, and the lower die (1) and the upper die (2) are respectively provided with a groove A (3), and the lower die (1) is provided with a groove B (4), a groove C (11), a groove D (12), a groove E (13) and a hole A (14), wherein the groove A (3) is connected to the groove B (4), the groove B (4) is connected to the groove C (11), and the groove C (11) is connected to the groove D (12).

2. A tool for reducing the degree of concavity on the surface of a wax part according to claim 1, characterized in that: The groove A (3) is fan-shaped at one end away from the groove B (4), the groove B (4) is triangular, the groove B (4) is connected to the groove C (11) via the connecting groove A (15), two grooves D (12) are symmetrically arranged in the groove C (11), and the groove E (13) and the hole A (14) are arranged at two locations on the lower mold (1).

3. A tool for reducing the degree of concavity on the surface of a wax part according to claim 1, characterized in that: The groove D (12) is in a truncated cone shape, and a cooling block (5) is arranged in the groove C (11).

4. A tool for reducing the degree of concavity on the surface of a wax part according to claim 1, characterized in that: The upper mold (2) is provided with a groove G (6), a groove H (21) and a groove F (22), one end of the groove G (6) is connected to the groove A (3), and the other end of the groove G (6) is connected to the groove H (21), the groove G (6) is triangular, and the groove F (22) is arranged in the groove H (21).

5. A tool for reducing the degree of concavity on the surface of a wax part according to claim 4, characterized in that: A groove I (23) is arranged inside the groove H (21), and the groove I (23) is connected to the groove F (22) via a connecting groove (24).

6. A tool for reducing the degree of concavity on the surface of a wax part according to claim 1, characterized in that: The upper die (2) is provided with a hole B (25), a groove J (26) and a groove K (27), and two of the hole B (25), the groove J (26) and the groove K (27) are provided respectively, and the groove J (26) and the groove K (27) are provided on both sides of the upper die (2).

7. A tool for reducing the degree of concavity on the surface of a wax part according to claim 4, characterized in that: The upper mold (2) is provided with a hole C (28), and the hole C (28) is connected to the groove H (21).

8. A tool for reducing the degree of concavity on the surface of a wax part according to claim 3, characterized in that: The ratio of the thickness of the cooling block (5) to the thickness of the wax piece flat plate is greater than or equal to 0.5.

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