A kind of semi-closed shell type casting narrow inner cavity cleaning tool and method of use

Abstract

The application relates to a kind of semi-closed spherical shell type casting narrow inner cavity cleaning tool and use method, tool includes handle, clamping rod, gear transmission mechanism, cover plate, protective cover plate, bottom plate, hard alloy polishing head and elastic baffle ring for shaft;The application ingeniously utilizes the characteristics that gear transmission mechanism can change axial movement direction, can make hard alloy polishing head to the column root position of product high-efficiency cleaning finishing, solves the structure interference problem when using simple flexible cutting tool to process narrow inner cavity space structure and the problem of operator's heavy labor intensity, also provides a solution and thought for the inner cavity cleaning problem of complex special-shaped curved surface structure product, has good popularization and application value.

Description

Technical Field

[0001] This invention relates to a cleaning tool and method for cleaning the narrow inner cavity of a semi-enclosed spherical shell casting, belonging to the field of casting post-processing technology. Background Technology

[0002] Investment casting technology has many advantages, such as low manufacturing cost, high dimensional accuracy, and low surface roughness, and is therefore widely used in the production and manufacturing of aerospace components. A certain semi-enclosed spherical shell casting is an investment casting made of S-08 steel. It consists of an inlet flange, an outlet flange, a spherical shell, and a central column. Both the inner and outer surfaces are spherical. The horizontal distance from the outer side of the central column to the inner edge of the circular hole of the inlet flange is less than 10 mm, and the internal cavity structure is extremely narrow.

[0003] During the wax mold shell making and shell firing processes, the narrow internal cavity of the product may lead to insufficient shell strength. This can cause foreign objects to appear at the root of the central column during molten metal impact during casting, necessitating grinding to smooth the area containing these foreign objects. However, due to the extremely narrow internal cavity, in actual production, only a simple shaving tool can be inserted through the outlet flange into the root of the central column for foreign object removal. Because of spatial interference between the shaving tool and the area to be cleaned, the processing angle is limited, hindering efficient cleaning of the central column root, reducing production efficiency, increasing the labor intensity for on-site operators, and making the cleaning process difficult. Therefore, there is an urgent need to research post-processing technology for this product, requiring a cleaning fixture specifically designed for the narrow internal cavity of semi-enclosed spherical shell castings to solve this production process problem and meet current production needs. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose a cleaning tool and method for the narrow inner cavity of a semi-enclosed spherical shell casting, which solves the problem that simple deflection tools cannot efficiently clean the narrow inner cavity of a semi-enclosed spherical shell casting.

[0005] The technical solution of this invention is: a semi-enclosed cleaning fixture for narrow internal cavities of spherical shell castings, comprising a handle, a clamping rod, a gear transmission mechanism, a cover plate, a protective cover plate, a base plate, a carbide grinding head, and a shaft elastic retaining ring; wherein,

[0006] The handle is connected to the cover plate via a welded metallurgical connection, allowing for a firm grip with both hands when using the internal cavity cleaning fixture, ensuring stability during operation. The clamping rod is connected to the cordless drill via an internal metal chuck, providing power to the internal cavity cleaning fixture. The clamping rod transmits power to the gear transmission mechanism, which in turn powers the carbide grinding head for internal cavity cleaning. The cover plate and protective cover plate are connected to the base plate via welded metallurgical connections, respectively limiting and fixing the drive wheel and driven wheel in space. The carbide grinding head is connected to the base plate via a threaded connection. The clamping rod and base plate are connected via mechanical assembly. The shaft elastic retaining ring is connected to the clamping rod via mechanical assembly to fix the axial movement of the clamping rod component, improving the stability of the internal cavity cleaning fixture during operation.

[0007] The gear transmission mechanism includes a driving gear and a driven gear, which are made of 45 steel and have a gear ratio of 4:1.

[0008] The thickness of the driving wheel is 3mm, the thickness of the driven wheel is 2.5mm, the center distance between the driving wheel and the driven wheel is 25mm, and the gear module M is 0.5mm.

[0009] The clamping rod has a clamping section diameter of 7mm, an extension section diameter of 8mm, and a total length of 76.5mm.

[0010] The drive wheel maintains a certain clearance with the cover plate and the base plate, and the driven wheel maintains a certain clearance with the protective cover plate and the base plate. The cover plate, protective cover plate and base plate protect the gear transmission mechanism and improve the service life of the gears.

[0011] When machining the driven wheel, first machine a 2.5mm inner diameter round hole on the driven wheel, and then machine an M3 internal thread on the 2.5mm round hole; when machining the carbide grinding head, first machine the upper cylindrical surface of the carbide grinding head to form a chamfer, then clamp the carbide grinding head on a bench vise for fixation, and then press the carbide grinding head to form an external thread; the driven wheel and the carbide grinding head are connected to each other by a threaded connection.

[0012] A method of using the aforementioned cavity cleaning fixture includes:

[0013] 1) Use an endoscope to observe the root of the product's central column, and use a black marker to mark the outlet flange end face corresponding to the location of the foreign object at the root of the product's central column;

[0014] 2) Insert the inner cavity cleaning fixture into the inner cavity of the product along the inner hole of the outlet flange, ensuring that the bottom plate end face of the inner cavity cleaning fixture is parallel to the middle column end face of the product that needs to be cleaned; connect the cordless electric drill and the clamping rod, and rotate the carbide grinding head to the position of the root of the middle column to be cleaned corresponding to the position marked on the end face of the outlet flange.

[0015] 3) Turn on the cordless drill switch, hold the handle of the cavity cleaning fixture with both hands, and then process the part with foreign objects at the base of the central column; after processing the part with foreign objects at the base of the central column, separate the clamping rod from the cordless drill, then rotate the carbide grinding head of the cavity cleaning fixture to the initial placement position, and then remove the cavity cleaning fixture from the product cavity, and use compressed air to blow away the grinding debris on the surface of the cavity cleaning fixture;

[0016] 4) After observing the removal of foreign objects at the root of the central column using an endoscope, use compressed air to blow out the product cavity to ensure the quality of the product cavity; if foreign objects still exist, return to step 1) until the foreign objects at the root of the central column corresponding to the marked position are removed.

[0017] When the carbide grinding head 208 of the internal cavity cleaning fixture is rotated, the rotation direction is right-handed, and it rotates clockwise during operation.

[0018] The rechargeable electric drill rotates to the left and then counterclockwise during operation.

[0019] The advantages of this invention compared to the prior art are:

[0020] (1) This invention provides a semi-enclosed spherical shell casting narrow inner cavity cleaning tool and a method of use. By using this tool, the problem of trimming and cleaning the root of the column in a certain product is solved, the cleaning efficiency of the inner cavity of the product is improved, and the combination with the real-time observation method of endoscope is conducive to strengthening the quality control of the root of the column in the product.

[0021] (2) This invention provides a semi-enclosed spherical shell casting narrow inner cavity cleaning tool and its usage method. It cleverly utilizes the characteristic of the gear transmission mechanism that can change the axial movement direction, enabling the carbide grinding head to efficiently clean and trim the root position of the product's central column. It solves the structural interference problem and the problem of high labor intensity for operators when using simple flexure tools to deal with narrow inner cavity space structures. It also provides a solution and idea for cleaning the inner cavity of complex irregular curved surface structure products, and has good promotion and application value. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the product structure according to an embodiment of the present invention;

[0023] Figure 2This is a schematic cross-sectional view of the product according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram showing the spatial position of the cavity cleaning tooling according to the present invention in the product;

[0025] Figure 4 This is a schematic diagram of the components of the cavity cleaning tooling according to the present invention;

[0026] Figure 5 This is a schematic diagram of the drive wheel and clamping rod (clamping section and extension section) of the cavity cleaning tool according to the present invention;

[0027] Figure 6 A schematic diagram of the driven wheel of the cavity cleaning fixture according to the present invention;

[0028] Figure 7 A schematic diagram of the handle of the cavity cleaning fixture according to the present invention;

[0029] Figure 8 A schematic diagram of the cover plate of the cavity cleaning fixture according to the present invention;

[0030] Figure 9 A schematic diagram of the protective cover plate of the cavity cleaning fixture of the present invention;

[0031] Figure 10 This is a schematic diagram of the base plate of the cavity cleaning fixture according to the present invention;

[0032] Figure 11 This is a schematic diagram of a carbide grinding head used for cleaning the internal cavity in this invention. Detailed Implementation

[0033] This invention proposes a semi-enclosed cleaning fixture for narrow internal cavities of spherical shell castings and its usage method. The product model structure is as follows: Figure 1 and Figure 2 As shown, the assembly includes the inlet flange, outlet flange, spherical shell, and central column. Based on the product's internal cavity structure, the internal cavity cleaning fixture is designed and fabricated. When designing the internal cavity cleaning fixture, the product's narrow internal cavity structure and spatial dimensions must be fully considered to avoid structural interference between the internal cavity cleaning fixture and the root of the central column and the wall surface of the spherical shell. The internal cavity cleaning fixture structure is as follows: Figure 3 and Figure 4 As shown, it consists of a handle 201, a clamping rod 202, a gear transmission mechanism (drive wheel 203 and driven wheel 204), a cover plate 205, a protective cover plate 206, a base plate 207, a carbide grinding head 208, and a shaft elastic retaining ring 209. Furthermore, this cordless electric drill, used in conjunction with the clamping rod 202 of the internal cavity cleaning fixture structure, is a tool for drilling holes in metal materials, wood, plastics, etc., and has forward and reverse rotation functions. The drive wheel 203 and driven wheel 204 are respectively described in... Figure 5 and Figure 6 As shown, the driving gear 203 and driven gear 204 are made of 45# steel, with a gear ratio of 4:1. The thickness of the driving gear 203 is 3mm, the thickness of the driven gear 204 is 2.5mm, the center distance between the driving gear 203 and driven gear 204 is 25mm, and the gear module M is 0.5mm. Figure 5 As shown, the clamping section of the clamping rod 202 has a diameter of Φ7mm, the extension section has a diameter of Φ8mm, and the total length is 76.5mm. During operation, the internal cavity cleaning fixture uses the metal chuck of a cordless electric drill to clamp and fix the Φ7mm diameter clamping section of the clamping rod 202, providing power for the internal cavity cleaning fixture's operation. Furthermore, the overall length of the clamping rod 202 needs to fully consider the overall height of the product when designing it to further ensure the stability and reliability of the internal cavity cleaning fixture during use. A schematic diagram of the three-dimensional model structure of the handle 201 is shown below. Figure 7 As shown.

[0034] Cover plate 205, protective cover plate 206, and base plate 207 are respectively shown in the following figures. Figure 8 , Figure 9 , Figure 10 As shown, a certain clearance is maintained between the driving wheel 203 and the cover plate 205, and between the driving wheel 203 and the base plate 207. A certain clearance is also maintained between the driven wheel 204 and the protective cover plate 206, and between the driven wheel 204 and the base plate 207. The cover plate 205, the protective cover plate 206, and the base plate 207 provide spatial limitation, positioning, and protection for the gear transmission mechanism (driving wheel 203 and driven wheel 204), effectively improving the service life of the gear transmission mechanism (driving wheel 203 and driven wheel 204).

[0035] like Figure 4 As shown, the handle 201 and the cover plate 205 are connected to each other by welding metallurgical bonding. During the cleaning of the product's internal cavity, the threaded connection fully utilizes the rotational relationship to ensure a tight connection between the driven wheel 204 and the carbide grinding head 208, increasing the stability of the internal cavity cleaning operation. When machining the driven wheel 204, firstly, a Φ2.5mm inner diameter circular hole is machined into the driven wheel 204, and an M3 internal thread is machined into the Φ2.5mm circular hole using a tap (internal threading tool). The required length of the carbide grinding head 208 is determined based on the height difference between the end face of the column and the root of the column in product 1. Firstly, the upper end face (cylindrical end face) of the carbide grinding head 208 is machined to form a chamfer to facilitate smooth passage through the inner hole of the die tool during subsequent machining. Then, the carbide grinding head 208 is clamped in a bench vise for fixation, and then an M3*0.5 die (external threading tool) is used to press the carbide grinding head 208 to form an external thread. The driven wheel 204 is connected to the carbide grinding head 208 by a threaded connection, which is simple in structure and easy to use.

[0036] First, use an endoscope to observe the root of the column in product 1, and mark the location of the foreign object at the root of the column on the outlet flange end face. Then, insert the inner cavity cleaning fixture 2 into the inner cavity of product 1 through the circular hole of the product outlet flange at a certain angle, ensuring that the lower end face of the base plate 207 of the inner cavity cleaning fixture 2 is flush with the end face of the column. The spatial position diagram of the inner cavity cleaning fixture 2 within product 1 during operation is shown below. Figure 4 As shown. The clamping rod 202 of the internal cavity cleaning fixture is clamped and fixed using the metal chuck of a cordless electric drill, and then the handle 201 is firmly gripped with both hands. Because the carbide grinding head 208 rotates clockwise during internal cavity cleaning, the driven wheel 204 must rotate clockwise, while the driving wheel 203 rotates counterclockwise. Therefore, the clamping rod 202 and the cordless electric drill must rotate counterclockwise. The cordless electric drill has bidirectional rotation capabilities, meeting the rotation direction requirements of the internal cavity cleaning fixture. Simultaneously, the driven wheel 204 and the base plate 207 will not interfere with each other due to contact with the inner wall of the product's spherical shell, thus facilitating effective and smooth grinding of the root area of ​​the central column containing foreign objects, improving the surface quality of the casting, and reducing the labor intensity of the operator.

[0037] After the internal cavity cleaning operation is completed, use an endoscope to observe the root of the column in product 1. If it is observed that the foreign object has been removed, first separate the clamping rod 202 from the metal chuck of the cordless drill, and then rotate the internal cavity cleaning fixture 2 at a certain angle and remove it from the round hole of the outlet flange of product 1. Finally, use compressed air to blow away debris from the internal cavity and outer surface of product 1 to ensure the quality of the internal cavity and outer surface of the product. If it is observed that the foreign object has not been removed, continue to use the internal cavity cleaning fixture 2 to clean the root of the column in the internal cavity until the foreign object at the root of the column in the product is removed. Finally, use compressed air to blow away the grinding debris on the surface of the internal cavity cleaning fixture.

[0038] The examples described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method of using an internal cavity cleaning fixture, the internal cavity cleaning fixture comprising a handle, a clamping rod, a gear transmission mechanism, a cover plate, a protective cover plate, a base plate, a carbide grinding head, and a shaft elastic retaining ring; wherein, The handle is connected to the cover plate by welding and metallurgical bonding, allowing for a firm grip with both hands when using the internal cavity cleaning fixture, ensuring stability during use. The clamping rod is connected to the cordless electric drill via an internal metal chuck, providing power to the internal cavity cleaning fixture. The clamping rod transmits power to the gear transmission mechanism, which in turn provides power to the carbide grinding head for internal cavity cleaning. The cover plate and protective cover plate are connected to the base plate by welding and metallurgical bonding, respectively limiting and fixing the drive wheel and driven wheel in space. The carbide grinding head is connected to the driven wheel via a threaded connection for smooth grinding. The clamping rod and base plate are connected by mechanical assembly. The shaft elastic retaining ring is connected to the clamping rod by mechanical assembly to fix the axial movement of the clamping rod component, improving the stability of the internal cavity cleaning fixture during operation. The gear transmission mechanism includes a drive wheel and a driven wheel. The fixture is characterized by including: 1) Use an endoscope to observe the root of the product's central column, and use a black marker to mark the outlet flange end face corresponding to the location of the foreign object at the root of the product's central column; 2) Insert the inner cavity cleaning fixture into the inner cavity of the product along the inner hole of the outlet flange, ensuring that the bottom plate end face of the inner cavity cleaning fixture is parallel to the middle column end face of the product that needs to be cleaned; connect the cordless electric drill and the clamping rod, and rotate the carbide grinding head to the position of the root of the middle column to be cleaned corresponding to the position marked on the end face of the outlet flange. 3) Turn on the cordless drill switch, hold the handle of the cavity cleaning fixture with both hands, and then process the part with foreign objects at the base of the central column; after processing the part with foreign objects at the base of the central column, separate the clamping rod from the cordless drill, then rotate the carbide grinding head of the cavity cleaning fixture to the initial placement position, and then remove the cavity cleaning fixture from the product cavity, and use compressed air to blow away the grinding debris on the surface of the cavity cleaning fixture; 4) After observing the removal of foreign objects at the root of the central column using an endoscope, use compressed air to blow out the product cavity to ensure the quality of the product cavity; if foreign objects still exist, return to step 1) until the foreign objects at the root of the central column corresponding to the marked position are removed.

2. The method according to claim 1, characterized in that, The thickness of the driving wheel is 3mm, the thickness of the driven wheel is 2.5mm, the center distance between the driving wheel and the driven wheel is 25mm, and the gear module M is 0.5mm.

3. The method according to claim 1, characterized in that, The clamping rod has a clamping section diameter of 7mm, an extension section diameter of 8mm, and a total length of 76.5mm.

4. The method according to claim 1, characterized in that, The drive wheel maintains a certain clearance with the cover plate and the base plate, and the driven wheel maintains a certain clearance with the protective cover plate and the base plate. The cover plate, protective cover plate and base plate protect the gear transmission mechanism and improve the service life of the gears.

5. The method according to claim 1, characterized in that, When the carbide grinding head 208 of the internal cavity cleaning fixture is rotated, the rotation direction is right-handed, and it rotates clockwise during operation.

6. The method according to claim 1, characterized in that, The rechargeable electric drill rotates to the left and then counterclockwise during operation.

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