Special-shaped die airtightness detection clamp

Abstract

The application discloses a special-shaped die airtightness detection clamp, which comprises a clamp base body, a shoulder end face of the base body, an airtightness detection pipeline and a blowing pipeline which are not communicated with each other in the base body, an airtightness detection hole and a blowing hole which are respectively communicated with the two pipelines and are arranged on the shoulder end face, the airtightness detection hole can be communicated with a die cavity to convey detection gas after the special-shaped die is clamped, the blowing hole can send in clean airflow before leak detection when a gap is formed by die adhesion, and an isolation debris storage groove is arranged between the airtightness detection hole and the blowing hole. The special-shaped die airtightness detection clamp adopts a double-independent-gas-path structure, the gap inside is blown after the special-shaped die is tightly sealed, then the debris is intercepted through the isolation debris storage groove, false detection caused by impurities and gaskets is effectively avoided, and the accuracy of airtightness detection data is ensured; the overall structure of the clamp is compact, the clamp can be adapted to automatic mass production continuous leak detection working conditions, and the operation stability and detection efficiency of the special-shaped die airtightness detection equipment are improved.

Description

Technical Field

[0001] This invention relates to the field of mold processing and testing technology, and in particular to a fixture for testing the air tightness of irregular molds. Background Technology

[0002] In the automated production process of precision irregular hollow molds, airtightness testing is a key step in controlling product yield. The mainstream testing method in the industry is pressure decay airtightness testing. Its conventional working principle is as follows: the two ends of the irregular mold are pressed tightly against the back positioning end face of the fixture, so that the hollow cavity inside the irregular mold and the air detection hole of the fixture form a sealed communication structure; the airtightness testing equipment fills the cavity of the irregular mold with clean compressed air at a set pressure through the air detection pipeline. After the air pressure stabilizes, it enters the pressure holding monitoring stage. By monitoring the amount of air pressure decay within a specified time, it is determined whether the irregular mold has leakage defects such as sand holes, cracks, or poor sealing.

[0003] In mass production, after machining and forming, the end faces of irregularly shaped molds often have fine iron filings, dust, and particulate impurities adhering to or remaining. Existing conventional irregularly shaped mold airtightness testing fixtures are equipped with independent blowing structures. However, the conventional blowing logic is that open-air blowing and slag removal can only be performed on the outer surface of the irregularly shaped mold when it is lifted away from the fixture and the end face is completely open. This method can only clean the floating dust and impurities on the exposed surface of the irregularly shaped mold and cannot handle the sealed gap areas formed after the irregularly shaped mold is pressed and fitted together.

[0004] When the irregularly shaped mold is pressed tightly against the back face of the fixture, the remaining fine impurities on the end face are completely sealed inside the narrow gap between the mold end face and the fixture back face, leaving no cleaning channel or cleaning process. During the pressure holding and leak detection process, the impurities in the gap can easily get stuck between the sealing surfaces, damaging the sealing of the end face. This causes the detection equipment to detect abnormal air pressure drop, resulting in qualified irregularly shaped molds being mistakenly identified as leaking molds, leading to a large number of false leak detections.

[0005] False positives not only reduce the accuracy and stability of airtightness testing, but also lead to rework and re-inspection of good products and irregular molds, and production line shutdowns for troubleshooting, seriously affecting the testing efficiency and production rhythm of automated production lines. Summary of the Invention

[0006] The purpose of this invention is to provide an airtightness testing fixture for irregular molds, which can pre-purge and collect impurities inside the mold's fitting gaps, effectively avoiding false detections caused by impurities padding the sealing surface, and improving the airtightness testing accuracy of irregular molds and the long-term operational stability of the equipment.

[0007] A fixture for testing the air tightness of an irregularly shaped mold includes a fixture base with a backing end face. The fixture base contains independent air detection and purging pipelines. The backing end face has corresponding air detection holes and purging holes. The air detection holes are connected to the air detection pipelines, enabling them to communicate with the mold cavity and deliver detection gas after the irregularly shaped mold is clamped. The purging holes are connected to the purging pipelines, enabling them to deliver clean airflow into the gap after the irregularly shaped mold is clamped and before the detection gas is delivered from the air detection holes. An isolation chip storage groove is formed between the air detection holes and the purging holes on the backing end face.

[0008] The system is equipped with two independent air paths that do not interfere with each other. After the mold is clamped and sealed, the gap is first blown in a directional manner, and then impurities are collected by the isolated chip collection tank. This prevents debris from piling up on the sealing surface and causing misjudgment from the source, effectively improving the accuracy of the airtightness test results of the entire equipment.

[0009] Optionally, the extension direction of the debris storage trough intersects with the line connecting the center points of the air detection port and the purge port. This intersecting arrangement extends the debris interception path, expands the impurity capture range, and further reduces the probability of debris accumulation in the sealed area.

[0010] Optionally, the debris storage trough is a V-shaped trough, with the bottom depth of the V-shaped trough greater than the depth of its two side edges. The slope and gravity act as a guide to allow impurities to settle and accumulate, keeping the sealed area at the mountain-side end clean and tidy over the long term.

[0011] Optionally, the chip collection tank has a stepped structure along its length. The stepped structure slows down the airflow velocity, allowing for the stratified trapping of ultrafine dust, making it suitable for high-dust mass production processing conditions.

[0012] Optionally, the air inspection port and the purge port are arranged diagonally on the mountain-side end face. The diagonal layout provides ample installation space for the cross-shaped chip collection trough, ensuring sufficient impurity interception stroke.

[0013] Optionally, a conical sealing section is provided at the end of the air inspection port near the mountain-side face. The inner diameter of the conical sealing section gradually narrows from the outside to the inside. A sealing steel ball is placed inside the conical sealing section, and the diameter of the sealing steel ball is larger than the minimum inner diameter of the conical sealing section. An interceptor is also provided inside the conical sealing section, located between the sealing steel ball and the mountain-side face. One-way sealing is achieved by the cooperation between the steel ball and the conical surface. The interceptor prevents the steel ball from falling out, ensuring stable air pressure and no backflow during inflation and pressure holding.

[0014] Optionally, with the clamp placed vertically, the lower semicircular area of ​​the inner wall of the conical sealing section is provided with an inner annular groove and an outer annular groove, with the inner annular groove located radially inside the outer annular groove. The double grooves at the bottom collect fallen impurities, preventing scale and debris from getting stuck on the steel ball sealing contact surface and ensuring long-term sealing performance.

[0015] Optionally, the purging port located on the mountain-side end face is designed with a funnel-shaped opening, with the larger diameter end of the funnel facing outwards from the mountain-side end face. The funnel-shaped opening diffuses the purging airflow, covering all areas of the gaps without any blind spots, resulting in more uniform slag removal.

[0016] Optionally, the orifice wall has a variable inclination angle along the depth direction. The gradual slope buffers the high-pressure airflow, preventing airflow from impacting and causing debris to splash backward, thus stabilizing the sweeping flow field in the gap.

[0017] Optionally, a recessed platform is provided at the end face of the gas detection port. The platform temporarily collects fine debris scattered around the gas detection port, reducing the direct contact of impurities with the sealing surface.

[0018] Optionally, dovetail stress grooves are intermittently provided on the outer peripheral side of the fixture base. The stress grooves release the internal stress generated during machining and long-term clamping, prevent warping and deformation of the backing end face, and ensure the sealing flatness for a long time.

[0019] Beneficial technical effects 1. This invention can complete the pre-purging and slag removal inside the gap under the clamping and sealing state of the irregular mold, breaking through the limitation of conventional clamps that can only clean the outer surface after the irregular mold is lifted out, eliminating false leakage caused by impurities from the root, and improving the accuracy of airtightness detection.

[0020] 2. The gas detection passage is equipped with a conical steel ball one-way sealing structure, combined with a double-layer slag collection tank at the bottom, which can stabilize the pressure and collect impurities in the pipeline, avoiding slag blockage and failure at the sealing position, and making the equipment more reliable in long-term operation.

[0021] 3. The fixture base is equipped with a dovetail stress relief groove to alleviate the deformation problem during long-term use. At the same time, the entire chip storage and purging structure is compatible with automated production lines and can stably adapt to long-term, high-rhythm continuous airtightness testing operations. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the assembly of the irregular mold airtightness testing fixture and the irregular mold of the present invention; Figure 2 This is a schematic diagram of the airtightness testing fixture for irregular molds of the present invention; Figure 3 This is a front view of the irregular mold airtightness testing fixture of the present invention; Figure 4 This is a side view of the irregular mold airtightness testing fixture of the present invention; Figure 5 for Figure 4 A sectional view obtained by cutting along section AA; Figure 6 for Figure 3 A cross-sectional view of the first structure is obtained by cutting along CC; Figure 7 for Figure 3 A sectional view obtained by cutting along BB; Figure 8 for Figure 3 A cross-sectional view of the first structure is obtained by cutting along DD; Figure 9 for Figure 8 A magnified view of a portion of point a; Figure 10 for Figure 3 A cross-sectional view of the second structure is obtained by cutting along DD; Figure 11 for Figure 10 A magnified view of a portion at point b in the middle; Figure 12 for Figure 3 A cross-sectional view of the third structure is obtained by cutting along DD; Figure 13 for Figure 12 A magnified view of a portion of point c in the middle; Figure 14 for Figure 3 A cross-sectional view of the second structure is obtained by cutting along CC; Figure 15 for Figure 14 A magnified view of a portion at point d in the middle; Figure 16 for Figure 3 A cross-sectional view of the first structure is obtained by cutting along BB; Figure 17 for Figure 16 A magnified view of a portion of point e in the middle; Figure 18 for Figure 3 A cross-sectional view of the second structure is obtained by cutting along BB; Figure 19 for Figure 18 A magnified view of a portion at point f; Figure 20 for Figure 3 A cross-sectional view of the third structure is obtained by cutting along CC. Figure 21 for Figure 20 A magnified view of a portion of point g; Figure 22 This is a schematic diagram of the irregular mold airtightness testing fixture of the present invention from another perspective.

[0024] Figure label: 1. Fixture base; 11. Mountain-side end face; 12. Gas detection pipeline; 121. Gas detection port; 1211. Conical plugging section; 12111. Inner annular groove; 12112. Outer annular groove; 1212. Plug steel ball; 1213. Interceptor; 1214. Settlement platform; 13. Purge piping; 131. Purge port; 14. Isolation chip storage groove; 15. Dovetail stress groove; 2. Screws; 3. Irregularly shaped molds. Detailed Implementation

[0025] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0027] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0028] See Figure 1- Figure 2 This invention relates to a special tooling fixture for automated airtightness testing of precision hollow irregular molds, which is suitable for use in batch automated leak detection production lines and serves as the core component for positioning, bearing, sealing, and ventilation of airtightness testing equipment.

[0029] The core working principle of this invention differs from that of conventional airtight clamps in that the working logic of the air circuit and the slag removal conditions are completely different. Conventional clamps can only complete the purging and slag removal operations in an open working condition when the irregular mold is lifted. After the irregular mold is pressed and leaked, there is no slag removal remedial means. This invention integrates two completely independent air circuit systems that work in separate time within the clamp base 1, redefining the leak detection process: After the irregular mold is pressed and attached to the back end face 11 to form a sealed gap space, the purging air circuit is activated first. Air is directionally delivered inside the sealed gap using the purging hole 131, driving the fine debris and dust trapped inside the gap to move in a directional manner. The impurities are intercepted and collected by the special debris storage structure on the end face. After the slag inside the gap is cleaned, the purging air circuit is closed, and then the air detection air circuit is activated to pressurize the irregular mold cavity and carry out normal airtight leak detection operations.

[0030] This invention eliminates the problem of false leaks caused by impurities in the gaps by pre-cleaning the inside of the tightly sealed gaps and then checking for leaks. It stabilizes the airtightness detection accuracy and is suitable for long-term, high-paced automated mass production testing.

[0031] See Figures 2-3 , Figures 6-7 The irregular mold air tightness testing fixture includes a fixture base 1, which has a backing end face 11. The fixture base 1 has independent air detection pipelines 12 and purge pipelines 13 inside. The backing end face 11 has corresponding air detection holes 121 and purge holes 131. The air detection hole 121 is connected to the air detection pipeline 12 and can be connected to the cavity of the irregular mold after the irregular mold is clamped and deliver detection gas. The purge hole 131 is connected to the purge pipeline 13 and can deliver clean airflow into the gap after the irregular mold is clamped and the detection gas is delivered by the air detection hole 121. The backing end face 11 has an isolation chip storage groove 14 between the air detection hole 121 and the purge hole 131.

[0032] The two air paths are completely isolated within the fixture base 1, with no interconnecting channels, allowing for independent airflow at different times without interference. During operation, the irregularly shaped mold is pressed tightly against the mountain-side end face 11 to form a sealed gap. Directional airflow is first delivered into the gap through the purge pipe 13 and purge hole 131, causing the fine debris trapped inside the gap to move. The debris is intercepted and collected by the isolated debris storage tank 14 along its drift path. (See [reference]). Figure 8-9 After completing the cleaning operation inside the gap, the purging air path is closed, and then air is pressurized into the inner cavity of the irregular mold through the air detection pipeline 12 and the air detection hole 121 to perform the airtightness test. This structure changes the limitation of conventional fixtures that can only be opened for external purging, and realizes active cleaning of the gap inside the clamped state, effectively avoiding the false leakage problem caused by impurities and gasket sealing surfaces, and improving the accuracy and stability of airtightness test results.

[0033] In some optional embodiments, the two air paths can be processed by integral drilling and forming of the fixture base 1, which results in a compact structure, strong overall rigidity, and resistance to deformation. The length and width of the isolation chip storage groove 14 can be flexibly adapted and adjusted according to the end face size of the irregular mold, the distance between the two holes, and the amount of impurities generated in the gap, which can be widely adapted to the air tightness testing of various specifications of irregular molds.

[0034] See Figures 2-3 In some embodiments, the extension direction of the isolation chip storage tank 14 intersects the line connecting the center points of the air detection hole 121 and the purge hole 131.

[0035] The extension trajectory of the isolation chip collection trough 14 is not parallel to the line connecting the centers of the two holes, but rather intersected, forming a cross-path interception structure. During leak detection using a shaped mold clamping mechanism, the main drift path of debris inside the gap is distributed along the line connecting the centers of the two holes. The intersecting isolation chip collection trough 14 can cut across the main movement trajectory of the debris, extending the debris interception stroke and increasing the probability of debris contact and retention. This structure can expand the coverage area for intercepting impurities in the gap, reduce the likelihood of debris bypassing the interception area and approaching the gas detection sealing surface, and further optimize the effect of preventing false detections.

[0036] In some optional embodiments, the isolation and slag storage tank 14 can adopt an obliquely cross-arranged structure. The cross angle can be finely adjusted according to the airflow velocity in the gap and the specifications of the irregular mold, so as to maximize the slag interception effect while ensuring the normal flow of air in the gap.

[0037] See Figures 10-11 In some embodiments, the isolation chip storage groove 14 is a V-shaped groove, and the bottom depth of the V-shaped groove is greater than the depth of the two sides of the V-shaped groove.

[0038] The V-groove is a groove structure with a V-shaped cross-section, exhibiting a sloping transition shape with higher edges on both sides and a lower bottom in the middle. After debris enters the isolated debris storage tank 14 with the airflow, it automatically gathers and settles towards the lower bottom of the tank under the guidance of the V-shaped slope and gravity, preventing debris from being suspended at the upper opening of the tank and drifting away with the airflow again. This structure effectively improves the stability of debris storage, continuously keeps the sealed area of ​​the back face 11 clean, and is suitable for continuous mass production testing conditions.

[0039] In some optional embodiments, the V-shaped trough slope adopts a smooth transition structure to reduce airflow turbulence; a micro-sinking platform structure can be added to the bottom of the trough to increase the slag storage capacity and reduce the frequency of manual slag cleaning.

[0040] See Figures 12-13 In some embodiments, the isolation chip storage tank 14 has a stepped structure along its length.

[0041] The isolation chip storage tank 14 features a multi-stage stepped structure along its length. This stepped structure progressively impedes and slows down the airflow velocity within the gaps, enabling the stratified and step-by-step settling of lightweight dust and ultrafine iron filings. This compensates for the insufficient interception capability of ordinary through-channels for fine impurities. This structure enhances the interception effect of fine dust, meeting the high-precision airtightness testing requirements of high-precision irregularly shaped molds.

[0042] In some optional embodiments, the height of the stepped structure decreases gradually along the airflow direction to form a gradient deceleration airflow field; the number of steps can be set to 2 to 5 levels according to the amount of dust in the production line, taking into account both airflow permeability and dust storage capacity.

[0043] See Figures 2-3 In some embodiments, the air detection port 121 and the purge port 131 are arranged diagonally on the mountain-side end face 11.

[0044] The gas inspection port 121 and the purge port 131 are arranged diagonally and offset on the mountain-side end face 11, side by side. This diagonal arrangement maximizes the center-to-center distance between the two ports, providing ample space for the cross-type isolation chip storage tank 14 and ensuring it has sufficient effective interception length. This structure avoids the problem of insufficient interception stroke and incomplete chip removal caused by excessively small hole spacing, ensuring the stable and effective operation of the chip storage structure. Simultaneously, the diagonal arrangement increases the center-to-center distance between the gas inspection port 121 and the purge port 131, keeping their drilling areas far apart. This results in uniform stress distribution within the substrate after machining, reducing the likelihood of hole wall cracking and micro-gaps, and effectively preventing cross-contamination between the two gas paths.

[0045] In some optional embodiments, the diagonal spacing between the two holes can be adjusted to fit the size of the sealing surface of the irregular mold, so that the airflow in the gap fully covers the area between the two holes and eliminates the blind spot for debris drift.

[0046] See Figures 14-15 In some embodiments, a conical sealing section 1211 is provided at one end of the air detection port 121 near the back face 11. The inner diameter of the conical sealing section 1211 gradually narrows from the outside to the inside. A sealing steel ball 1212 is placed inside the conical sealing section 1211. The diameter of the sealing steel ball 1212 is larger than the minimum inner diameter of the conical sealing section 1211. An interceptor 1213 is also provided inside the conical sealing section 1211. The interceptor 1213 is located between the sealing steel ball 1212 and the back face 11.

[0047] The conical sealing section 1211 is a tapered conical surface structure with a larger outer diameter and a smaller inner diameter at the gas detection port 121. The outer diameter of the sealing steel ball 1212 is larger than the minimum inner diameter of the conical sealing section 1211, so it can fit with the conical surface to form a seal. The interceptor 1213 is arranged on the side of the sealing steel ball 1212 facing the mountain end face 11, which is used to limit the outward movement limit of the sealing steel ball 1212, while reserving a ventilation channel. The complete workflow is divided into two stages: inflation and air supply, and pressure holding and leak detection. In the inflation stage, compressed air is introduced from the air detection pipeline 12. The airflow pushes the sealing steel ball 1212 towards the mountain end face 11. After the sealing steel ball 1212 moves to the position of the interceptor 1213, it is limited and blocked, and cannot continue to move outward or fall into the cavity of the irregular mold. At this time, an annular gap is formed between the sealing steel ball 1212 and the conical surface of the conical sealing section 1211. The compressed air passes through the air passage of the interceptor 1213 through this gap and is smoothly introduced into the cavity of the irregular mold to complete the inflation. During the pressure holding and leak detection stage, external gas supply is stopped. The gas pressure inside the sealed cavity of the irregular mold is higher than the gas pressure in the rear gas detection pipeline 12. The high-pressure gas inside the irregular mold pushes the sealing steel ball 1212 inward to retract. The sealing steel ball 1212 fits tightly against the conical sealing section 1211, and the annular gap is completely closed, blocking the gas from flowing back into the pipeline and maintaining a stable pressure holding environment inside the irregular mold cavity. This structure relies on the interceptor 1213 to limit and prevent the sealing steel ball 1212 from falling off, and relies on the cooperation between the sealing steel ball 1212 and the conical sealing section 1211 to achieve one-way sealing. Inflation allows normal gas flow, and pressure holding prevents gas backflow, ensuring stable gas pressure during the gas detection and pressure holding stage and improving the accuracy of airtightness test data.

[0048] In some optional embodiments, the taper of the conical sealing section 1211 is set to 15° to 45° to ensure the stable self-centering and seating effect of the sealing steel ball 1212; the sealing steel ball 1212 is made of high-hardness and wear-resistant material, which is not easily deformed by repeated seating over a long period of time and has high sealing reliability; the interceptor 1213 can be selected from various structural forms such as hollow mesh retaining ring, circumferential multi-point boss, and strip hollow partition, which can be integrally milled with the fixture base 1 or assembled as an embedded independent part, with flexible structural form and convenient disassembly and maintenance.

[0049] See Figure 15 In some embodiments, when the clamp is placed vertically, the lower semi-circular arc region of the inner wall of the conical sealing section 1211 is provided with an inner annular groove 12111 and an outer annular groove 12112, with the inner annular groove 12111 located radially inside the outer annular groove 12112.

[0050] The inner annular groove 12111 and the outer annular groove 12112 are only provided in the lower semi-circular area of ​​the inner wall of the conical sealing section 1211, while the upper semi-circular area retains the complete conical sealing structure. Fine impurities falling into the gap will only settle and accumulate in the lower half of the conical sealing section 1211 due to gravity. The double-layered annular groove in the lower semi-circular area can collect and retain these fine impurities, preventing them from adhering to the sealing surface of the upper semi-circular area and thus avoiding interference with the sealing accuracy between the sealing ball 1212 and the conical sealing section 1211. This structure, while ensuring the sealing performance of the gas path, improves the self-cleaning ability of the conical sealing section 1211 and reduces sealing problems caused by impurity blockage.

[0051] In some optional embodiments, the width and depth of the two-layer annular trough are reasonably matched, the edges and corners of the trough are smoothly transitioned, there are no dead corners for slag accumulation, which facilitates daily cleaning and maintenance and is suitable for long-term continuous operation.

[0052] See Figures 16-17 In some embodiments, the opening of the purge hole 131 on the back face 11 is configured as a flared structure, with the larger diameter end of the flared opening facing outward from the back face 11.

[0053] The flared nozzle structure features an outward-expanding, gradually changing shape for the 131 purging hole, with the outer diameter larger than the inner diameter of the hole. This outward-expanding flared nozzle diffuses the purging airflow, expanding its coverage and ensuring even distribution across the entire gap between the irregular mold and the backing face 11. This structure eliminates localized airflow blind spots in the gap, guaranteeing that debris from all areas can be carried and migrated by the airflow, thus improving overall slag removal uniformity.

[0054] In some optional embodiments, the flare mouth adopts a smooth outward expansion transition structure, which can be adapted to the outward expansion diameter according to the height of the gap, ensuring gentle airflow diffusion and no local high pressure impact.

[0055] See Figures 18-19 In some embodiments, the wall of the flared opening has a variable tilt angle structure along the depth direction of the opening.

[0056] The variable inclination angle structure refers to the gradually changing inclination angle of the orifice wall along the depth direction, rather than a single fixed taper. The gradual inclination angle can buffer the high-pressure purging airflow in stages, suppressing airflow turbulence, local high pressure, and backflow phenomena. This structure can prevent high-pressure airflow from directly impacting the end face, causing fine slag to move backward and splash everywhere, ensuring a smooth and orderly flow of air in the gap.

[0057] In some optional embodiments, a gradual gradient structure with a small inlet angle and a large outlet angle is adopted to achieve gradual diffusion and stabilization of airflow, resulting in a more stable slag removal effect.

[0058] See Figures 20-21 In some embodiments, the air inspection port 121 is provided with a recessed platform 1214 at the mountain-facing end face 11.

[0059] The recessed platform 1214 is a stepped structure on the port of the gas detection port 121 and the mountain-facing end face 11. The recessed platform 1214 forms a local recessed storage space, which can temporarily collect trace debris scattered around the gas detection port 121. This structure can prevent trace debris from directly adhering to the core sealing contact surface, further protecting the gas detection sealing area and helping to reduce the probability of false leaks.

[0060] In some optional embodiments, the settling platform 1214 adopts a shallow groove recessed structure with a moderate recessed depth, which reserves space for slag storage while not affecting the overall fit and sealing of the irregular mold end face.

[0061] See Figures 4-5 and Figure 22 In some embodiments, dovetail stress grooves 15 are intermittently provided on the outer peripheral side of the fixture base 1.

[0062] The dovetail stress groove 15 is a stress relief groove with a dovetail-shaped cross-section, discontinuously distributed on the outside of the fixture base 1. The dovetail stress groove 15 can effectively release the residual stress from machining, the alternating thermal stress, and the long-term clamping and compressing stress of the fixture base 1, reducing the deformation of the fixture base 1 and the warping of the backing end face 11. This structure can ensure the flatness and sealing accuracy of the backing end face 11 for a long time, effectively extending the overall service life of the fixture.

[0063] In some optional embodiments, the dovetail stress grooves 15 are evenly spaced, the grooves are smoothly transitioned, and the stress release is uniform; the groove depth is adapted to the thickness of the substrate, taking into account both the stress release effect and the rigidity of the substrate structure.

[0064] See Figure 1 In some embodiments, this fixture can be used as a dedicated clamping structure for rapid processing of irregular molds 3. The complete fixture includes a fixture base 1 and screws 2. The side of the fixture base 1 is provided with a positioning and fitting reference surface that matches the irregular mold 3, and the fixture base 1 is provided with assembly threaded holes.

[0065] In the actual assembly and processing, the large end face of the irregular mold 3 is aligned with the reference side of the fixture base 1 to ensure that the mating surfaces of the irregular mold 3 are completely fitted without gaps. Then, screws 2 are inserted through the threaded holes and tightened to fix it, achieving rapid positioning and rigid locking of the irregular mold 3. This structure has a unified positioning reference and simple clamping steps, enabling rapid clamping and batch processing of similar irregular molds 3.

[0066] This special clamping structure effectively solves the problems of cumbersome clamping, time-consuming tool calibration, and limited production capacity in conventional irregular mold processing. It simplifies the clamping and positioning process of irregular mold 3, improves the processing convenience, processing accuracy and batch production efficiency of irregular mold 3, and effectively ensures the structural stability of irregular mold 3 during processing, thereby improving the overall processing quality.

[0067] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0068] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A gas tightness testing fixture for irregular molds, comprising a fixture base (1), wherein the fixture base (1) is provided with a backing end face (11), and the fixture base (1) is provided with independent gas testing pipelines (12) and purging pipelines (13); characterized in that: The backing end face (11) is provided with a gas detection hole (121) and a purge hole (131). The gas detection hole (121) is connected to the gas detection pipeline (12) and can communicate with the cavity of the irregular mold after the irregular mold is clamped and deliver detection gas. The purge hole (131) is connected to the purge pipeline (13) and can deliver clean airflow into the gap after the irregular mold is clamped and a gap is formed and before the gas detection hole (121) delivers detection gas. The backing end face (11) is provided with an isolation chip storage groove (14) between the gas detection hole (121) and the purge hole (131). The gas detection port (121) is provided with a conical sealing section (1211) at one end near the back face (11). The inner diameter of the conical sealing section (1211) gradually narrows from the outside to the inside. A sealing steel ball (1212) is placed inside the conical sealing section (1211). The diameter of the sealing steel ball (1212) is larger than the minimum inner diameter of the conical sealing section (1211). An interceptor (1213) is also provided inside the conical sealing section (1211). The interceptor (1213) is located between the sealing steel ball (1212) and the back face (11).

2. The irregular mold airtightness testing fixture according to claim 1, characterized in that: The extension direction of the isolation chip storage tank (14) intersects the line connecting the center points of the air detection hole (121) and the purge hole (131).

3. The irregular mold airtightness testing fixture according to claim 1, characterized in that: The isolation chip storage groove (14) is a V-shaped groove, and the bottom depth of the V-shaped groove is greater than the depth of the two sides of the V-shaped groove.

4. The irregular mold airtightness testing fixture according to claim 1, characterized in that: The isolation chip storage tank (14) has a stepped structure along its length.

5. The irregular mold airtightness testing fixture according to claim 2, characterized in that: The air inspection port (121) and the purge port (131) are arranged diagonally on the mountain-side end face (11).

6. The irregular mold airtightness testing fixture according to claim 1, characterized in that: When the clamp is placed vertically, the lower semi-circular arc area of ​​the inner wall of the conical sealing section (1211) is provided with an inner annular groove (12111) and an outer annular groove (12112), and the inner annular groove (12111) is located on the radial inner side of the outer annular groove (12112).

7. The irregular mold airtightness testing fixture according to claim 1, characterized in that: The purging hole (131) located on the back face (11) is configured as a flared mouth structure, with the large diameter end of the flared mouth structure facing outward from the back face (11).

8. The irregular mold airtightness testing fixture according to claim 7, characterized in that: The wall of the funnel-shaped structure has a variable tilt angle along the depth direction of the hole.

9. The irregular mold airtightness testing fixture according to claim 1, characterized in that: The outer peripheral side of the fixture base (1) is intermittently provided with dovetail stress grooves (15).

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