A precision casting injection molding mold and a quality detection method thereof

Abstract

This invention belongs to the field of wax pattern injection molding and discloses a precision casting injection molding die and its quality inspection method. The aim is to solve the problem that current wax pattern molding technology suffers from dimensional deformation after molding due to fluctuations in equipment pressure, flow rate, and time control. Traditional equipment inspection methods struggle to accurately assess these fluctuations, making quality inspection difficult. The injection molding die of this invention includes a runner I, a part wax pattern body, a runner II, a stepped sample, and flow indicator scale lines. During wax pattern injection, the wax liquid passes through the part wax pattern body and further fills the stepped sample. The flow indicator scale lines provide the flow capacity index of the wax pattern filling, reflecting the injection pressure, flow rate, and time characteristics of each wax pattern. This allows for timely recalibration of equipment parameters when the injection quality of the wax pattern changes, maintaining the wax pattern flow index within a stable range and ensuring the injection quality of the wax pattern.

Description

Technical Field

[0001] This invention belongs to the field of wax mold injection molding, and specifically relates to a precision casting injection mold and its quality inspection method. Background Technology

[0002] Heavy-duty gas turbine hot-end components are all manufactured using investment casting, such as turbine blades. The manufacturing process is as follows: "blade design → mold design and manufacturing → wax pattern pressing → wax pattern assembly → ceramic shell preparation → shell dewaxing → shell firing → shell preheating → steel melting and pouring → shell cleaning → hot isostatic pressing → heat treatment → machining → thermal spraying".

[0003] This invention addresses the entire manufacturing process of hot-end components in heavy-duty gas turbines, particularly high-temperature turbine blades. The entire process, including wax pattern preparation, shell preparation, solidification after melting and casting, hot isostatic pressing, and heat treatment, involves continuous dimensional deformation, making deformation control extremely difficult. The industry often compensates for this deformation through wax pattern dimensional compensation, making wax pattern dimensional control critical. Wax patterns are typically produced using wax pressing machines, primarily through injection molding. Injection control involves numerous parameters such as temperature, pressure, flow rate, and time, and fluctuations in these parameters all affect the wax pattern's dimensions. Traditional equipment inspection methods struggle to accurately assess fluctuations in pressure, flow rate, and time, complicating wax pattern quality inspection. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a precision casting injection mold and its quality inspection method. The aim is to solve the problem that current wax mold forming technology suffers from dimensional deformation after wax mold forming due to fluctuations in equipment pressure, flow rate, and time control. Traditional equipment inspection methods struggle to accurately assess the fluctuations in pressure, flow rate, and time, making wax mold quality inspection difficult.

[0005] To achieve the objective of this invention, the technical solution adopted is as follows: A precision casting injection mold includes: runner I 1, part wax model body 2, runner II 3, stepped sample 4, and flow indicator scale line 5.

[0006] Among them, flow channel I1 is connected to the wax model body 2 of the part, the other end of the wax model body 2 is connected to flow channel II3, the other end of flow channel II3 is connected to the stepped sample 4, and the front of the stepped sample 4 is engraved with flow indicator scale line 5.

[0007] Among them, the stepped sample 4 is composed of steps of different thicknesses, with the thickness of the steps decreasing sequentially until the normal injection process cannot completely fill it; further, the number of steps is preferably 5 to 8; further, the thickness of the steps is preferably 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, 0.5mm, and 0.2mm respectively.

[0008] Among them, the flow indicator scale line 5 consists of several scale lines, and Arabic numerals are marked below the scale lines. The Arabic numerals represent the flowability index of the mold parts. The flow indicator scale shows the flow length; the steps are to impede the flow of wax and prevent it from being made infinitely long.

[0009] The stepped specimen can be replaced with a spiral specimen.

[0010] The quality inspection method for precision casting injection molding dies provided by this invention includes the following steps: 1. During wax injection, the wax liquid fills the wax mold body through runner I and then further fills the stepped sample through runner II. Since the stepped sample is thinner and thinner, it will not be completely filled under normal filling conditions. When the wax liquid stops flowing, read the Arabic numerals on the indicator scale corresponding to the position where the wax liquid stops at the step. This gives the flowability index of the mold part.

[0011] 2. For each injection molded part, record the flowability index corresponding to the flow indicator scale line on the stepped sample. The flowability index reflects the injection pressure, flow rate, and time characteristics of each wax mold.

[0012] 3. When the flowability index changes abruptly, it indicates that the injection pressure, flow rate, and time of the wax mold have changed, and the pressure, flow rate, and time settings of the equipment should be recalibrated.

[0013] 4. After recalibrating the equipment parameters, conduct the injection molding test again and adjust the wax mold flowability index to a stable range.

[0014] The precision casting injection mold and its quality inspection method provided by this invention are applicable to ceramic core molds and a wide range of injection molding mold design and product quality inspection.

[0015] The above technical solution has the following beneficial effects: Compared to existing technologies, this invention adds a stepped sample to the traditional wax mold forming mold. The stepped sample consists of steps of varying thicknesses, with graduated markings on its back. During wax injection, after the wax fills the part body, it further fills the stepped sample. Because the stepped sample becomes increasingly thin, it will not be completely filled under normal filling conditions. The filling capacity index of the wax mold can be obtained through the graduated lines on the sample. When the flow capacity index changes abruptly during the filling process, it indicates a change in the injection quality of the wax mold. Equipment parameters can be promptly readjusted to maintain the wax mold flow index within a stable range, thereby ensuring the injection quality of the wax mold. Attached Figure Description

[0016] Figure 1This is a front view of the injection molding die structure of the present invention; Figure 2 This is a side view of the injection molding die structure of the present invention; Figure 3 Here is a detailed view of the stepped sample; Figure 4 Example diagram of wax mold injection molding provided in Example 1; Figure 5 Example diagram of wax mold injection molding provided in Example 2; In the figure: 1-Flow channel I, 2-Part wax model body, 3-Flow channel II, 4-Stepped sample, 5-Flow indicator scale line. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0018] Example 1 The present invention provides a precision casting injection molding mold, comprising: runner I 1, part wax model body 2, runner II 3, stepped sample 4, and flow indicator scale line 5.

[0019] In this embodiment, flow channel I1 connects to the wax model body 2, the other end of the wax model body 2 connects to flow channel II3, and the other end of flow channel II3 connects to the stepped sample 4. The front of the stepped sample 4 is engraved with flow indicator scale lines 5. The stepped sample 4 is composed of steps of different thicknesses. In this embodiment, there are 8 steps, and the thickness of the steps decreases sequentially, namely 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, 0.5mm, and 0.2mm. The flow indicator scale lines 5 are composed of several scale lines, and Arabic numerals are marked below the scale lines. The Arabic numerals represent the flowability index of the mold part. In this embodiment, the Arabic numerals start from 1.

[0020] Example 2 The quality inspection method for precision casting injection molds provided by this invention specifically includes: During wax pattern injection, the wax liquid fills the wax pattern body through flow channel I, and then further fills the stepped sample through flow channel II. Since the stepped sample becomes thinner and thinner, it will not be completely filled under normal filling conditions. The flow capacity index of the wax pattern can be obtained through the flow indicator scale. After each part is injection molded, the flow capacity index corresponding to the flow indicator scale on the stepped sample is recorded. The flow capacity index reflects the injection pressure, flow rate, and time characteristics of each wax pattern.

[0021] In this embodiment, the flow capacity index corresponding to the flow indicator scale line on the stepped sample was recorded four times, which were 33, 33, 33, and 34 respectively. Figure 4 The schematic diagram of wax mold injection molding shown shows that the stepped sample was partially filled, and the flowability index did not change abruptly.

[0022] Example 3 The quality inspection method for precision casting injection molds provided by this invention specifically includes: During wax pattern injection, the molten wax fills the wax pattern body through runner I and then further fills the stepped sample through runner II. Because the stepped sample becomes increasingly thin, it will not be completely filled under normal filling conditions. The flowability index of the wax pattern can be obtained through the flow indicator scale. After each part is injection molded, the flowability index corresponding to the flow indicator scale on the stepped sample is recorded. The flowability index reflects the injection pressure, flow rate, and time characteristics of each wax pattern. If the flowability index changes abruptly, it indicates a change in the injection quality of the wax pattern. The pressure, flow rate, and time settings of the equipment should be recalibrated. After recalibrating the equipment parameters, another injection molding test should be conducted to calibrate the wax pattern flowability index to a stable range.

[0023] In this embodiment, under the same filling conditions as in Example 2, the flow capacity index corresponding to the flow indicator scale line on the stepped sample was recorded four times, which were 43, 43, 43, and 44 respectively. Figure 5 The schematic diagram of wax mold injection molding shown shows that the flow capacity index corresponding to the flow indicator scale line on the stepped sample has a significant abrupt change, indicating that the filling capacity of the wax mold has changed. After recalibrating the pressure, flow rate, and time devices of the equipment and re-correcting the equipment parameters, the injection molding test was carried out again to adjust the flow capacity index of the wax mold to a stable range, which is 34, 34, 33, and 33 respectively.

[0024] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A precision casting injection mold, characterized in that: Includes flow channel I (1), part wax model body (2), flow channel II (3), stepped sample (4), flow indicator scale line (5); The flow channel I (1) is connected to the wax model body (2), the other end of the wax model body (2) is connected to the flow channel II (3), the other end of the flow channel II (3) is connected to the stepped sample (4), and the front of the stepped sample (4) is engraved with flow indicator scale lines (5). The stepped sample (4) is composed of steps of different thicknesses, with the thickness of the steps decreasing sequentially until the normal injection process cannot completely fill it; The flow indicator scale line (5) consists of several scale lines, with Arabic numerals marked below the scale lines. The Arabic numerals represent the flow capability index of the mold part.

2. The precision casting injection mold according to claim 1, characterized in that: The stepped specimen (4) has 5 to 8 steps.

3. The precision casting injection mold according to claim 1, characterized in that: The step thicknesses of the stepped specimens (4) are 6mm, 5mm, 4mm, 3mm, 2mm, 1mm, 0.5mm, and 0.2mm, respectively.

4. A quality inspection method for precision casting injection molds as described in any one of claims 1-3, characterized in that, Including the following steps: (1) When the wax mold is injected, the wax liquid fills the wax mold body of the part through the flow channel I, and then further fills the stepped sample through the flow channel II. Since the stepped sample is thinner and thinner, the stepped sample will not be completely filled under normal filling conditions. When the wax liquid is filled to the point where the wax liquid no longer flows, read the Arabic numeral on the indicator scale line corresponding to the position where the wax liquid stops at the step, and obtain the flowability index of the current mold part. (2) For each injection molded part, record the flow capacity index corresponding to the flow indicator scale line on the stepped sample. The flow capacity index reflects the injection pressure, flow rate, and time characteristics of each wax mold. (3) When the flowability index changes abruptly, it indicates that the injection quality of the wax mold has changed, and the pressure, flow rate, and time devices of the equipment should be recalibrated. (4) After recalibrating the equipment parameters, conduct the injection molding test again and adjust the wax mold flowability index to a stable range.

5. The quality inspection method for precision casting injection molds according to claim 4, characterized in that: The quality inspection method for precision casting injection molds is applicable to ceramic core molds.

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