A fixture for finishing a box casting
Patent Information
- Application Number
- CN202522507715.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-11-25
AI Technical Summary
铸件在机床上进行精加工时，需要使用夹具来保证铸件的精准定位、可靠夹紧与稳定支撑，对于一些箱体类铸件（如图1所示），由于此类铸件多为薄壁、腔室结构，加工面周围的装夹面（如腔室开口处）较窄，若采用的夹具结构的夹紧点集中在铸件某一局部，会产生应力集中，导致铸件局部变形；若采用大面积的夹具结构进行面接触夹紧，虽能分散应力，但会遮挡部分加工面，影响加工完整性
将底座水平安装在机床工作台面，然后将箱体铸件水平放置在夹具上，连接座穿设在箱体铸件的内腔，压紧组件包括多个间隔设置的压块，压块用于压紧在箱体铸件顶部，多个间隔设置的压块避免夹紧点集中在铸件某一局部，防止铸件局部变形，且每个压块面积较小，避免大面积遮挡箱体铸件加工面，保证加工完整性，而支撑组件支撑在箱体铸件的底部边缘，为箱体铸件提供稳定支撑，侧向限位组件用于抵在箱体铸件的两侧内侧壁，用于对箱体铸件进行侧向限位，从而实现对箱体铸件的定位、夹紧，保证箱体铸件顺利完成精加工。
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Figure CN224879993U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tooling fixtures, and in particular to a fixture for precision machining of box castings. Background Technology
[0002] Castings are produced by injecting molten metal or alloy into a pre-prepared mold through methods such as pouring, injection, or suction. After cooling and solidification, the mold is removed to obtain a blank with a specific shape, size, and properties. Due to factors such as mold precision, casting shrinkage, and metal fluidity, the casting blank inherently contains defects and requires a series of subsequent high-precision machining processes, such as precision milling and grinding, to eliminate casting defects, correct dimensional deviations, and improve surface quality and assembly accuracy. When precision machining castings on machine tools, fixtures are needed to ensure accurate positioning, reliable clamping, and stable support. For some box-shaped castings (such as…),… Figure 1 As shown in the figure, since such castings are mostly thin-walled and have a cavity structure, the clamping surface around the machined surface (such as the cavity opening) is relatively narrow. If the clamping points of the fixture structure are concentrated in a certain part of the casting, stress concentration will occur, resulting in local deformation of the casting. If a large-area fixture structure is used for surface contact clamping, although the stress can be dispersed, it will block part of the machined surface and affect the integrity of the machining.
[0003] Therefore, there is an urgent need to provide a fixture for the precision machining of box castings. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a fixture for precision machining of box castings, which can position and clamp the box castings, avoid the clamping points being concentrated in a certain part of the box castings, prevent local deformation of the box castings, avoid large-area obstruction of the machining surface of the box castings, and ensure the integrity of the machining.
[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A fixture for precision machining of a box casting includes a base, a connecting seat, a clamping assembly, a support assembly, and a lateral limiting assembly. The connecting seat is integrally connected to the base and is used to pass through the inner cavity of the box casting from bottom to top. The clamping assembly is detachably connected to the top of the connecting seat and includes a plurality of spaced-apart pressure blocks for clamping onto the box casting. The support assembly is integrally connected to the base and located outside the connecting seat, and is used to support the bottom of the box casting. The lateral limiting assembly is detachably connected to the side wall of the connecting seat and is used to abut against the inner side wall of the box casting.
[0006] In some embodiments, the base is provided with a plurality of mounting through holes spaced apart.
[0007] In some embodiments, the connecting seat includes a horizontal plate and two side plates, which are respectively vertically disposed on both sides of the horizontal plate. One end of the side plate is integrally connected to the horizontal plate, and the other end is integrally connected to the base. The area of the base is larger than the area of the horizontal plate.
[0008] In some embodiments, at least four first screw holes are spaced apart on the horizontal plate, and the four first screw holes include four located at the four corners of the horizontal plate; the number of pressure blocks corresponds to the number of first screw holes, and each pressure block is provided with an oblong hole, the diameter of which is adapted to the first screw hole.
[0009] In some embodiments, each side plate is provided with at least two second screw holes at intervals; the lateral limiting assembly includes limiting screws in a number corresponding to the number of second screw holes, the limiting screws passing through the second screw holes and being threadedly connected to the second screw holes.
[0010] In some embodiments, the support assembly includes at least four support columns, and four of the at least four support columns are located at the four corners of the base, with the support columns erected on the base.
[0011] Compared with the prior art, this utility model achieves at least the following beneficial effects: The base is horizontally installed on the machine tool worktable. Then, the box casting is horizontally placed on the fixture. The connecting seat passes through the inner cavity of the box casting. The clamping assembly includes multiple spaced-apart pressure blocks, which are used to press against the top of the box casting. The multiple spaced-apart pressure blocks prevent the clamping point from being concentrated in a certain part of the casting, thus preventing local deformation of the casting. Moreover, each pressure block has a small area, which avoids large-area obstruction of the machining surface of the box casting and ensures the integrity of the machining. The support assembly supports the bottom edge of the box casting, providing stable support for the box casting. The lateral limiting assembly is used to abut against the inner side walls on both sides of the box casting to laterally limit the box casting, thereby realizing the positioning and clamping of the box casting and ensuring that the box casting can be successfully finished. Attached Figure Description
[0012] Figure 1 This is a structural schematic diagram of the box casting; Figure 2 This is a front view of the present invention; Figure 3 This is a structural schematic diagram of the present invention in use. Figure 4 This is a top view of the present invention in its use state; Figure 5 This is a bottom view of the present invention in use.
[0013] The following are the labels in the diagram: 1. Base; 11. Mounting through hole; 2. Connecting seat; 21. Horizontal plate; 211. First screw hole; 22. Side plate; 3. Clamping assembly; 31. Clamping block; 311. Waist-shaped hole; 4. Support assembly; 41. Support column; 5. Lateral limiting assembly; 51. Limiting screw; 6. Box casting. Detailed Implementation
[0014] The present invention will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of this application more complete and to fully convey the concept of the present application to those skilled in the art.
[0015] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "several" or "more than" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In this application, unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. Moreover, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0016] like Figures 1-5 As shown in the embodiment of this application, the fixture for precision machining of the box casting is used to position and clamp the box casting 6 on a machine tool.
[0017] The fixture for finishing the box casting 6 includes a base 1, a connecting seat 2, a clamping assembly 3, a support assembly 4, and a lateral limiting assembly 5. The base 1 is mounted on the machine tool worktable. The connecting seat 2 is integrally connected to the base 1 and is used to pass through the inner cavity of the box casting 6 from bottom to top. The clamping assembly 3 is detachably connected to the top of the connecting seat 2. The clamping assembly 3 includes multiple spaced pressure blocks 31, which are used to clamp the box casting 6. The multiple spaced pressure blocks 31 avoid the clamping point being concentrated in a certain part of the casting, preventing local deformation of the casting. Moreover, each pressure block 31 has a small area and will not cover the machining surface in a large area, ensuring the integrity of the machining. The support assembly 4 is integrally connected to the base 1 and located outside the connecting seat 2. It is used to support the bottom edge of the box casting 6. The lateral limiting assembly 5 is detachably connected to the side wall of the connecting seat 2 and is used to abut against the inner side wall of the box casting 6, thereby achieving clamping and positioning of the box casting 6.
[0018] Optionally, the base 1 is provided with a number of mounting through holes 11 at intervals. Each mounting through hole 11 is used to install a T-bolt. The conventional machine tool worktable usually has a standard T-slot. The base 1 is placed stably on the machine tool worktable, the head of the T-bolt is inserted from one end of the T-slot and slid along the length of the slot to the mounting through hole 11 of the base 1, the threaded part of the T-bolt is passed upward through the mounting through hole 11, and the protruding end is tightened with a lock nut, thereby realizing the fixed connection between the base 1 and the machine tool worktable.
[0019] Optionally, the connecting seat 2 includes a horizontal plate 21 and two side plates 22. The two side plates 22 are respectively vertically arranged on both sides of the horizontal plate 21. One end of the side plate 22 is integrally connected to the horizontal plate 21, and the other end is integrally connected to the base 1. The area of the base 1 is larger than the area of the horizontal plate 21. During the finishing process, cutting forces, inertial forces, etc. are prone to generating overturning moments or vibrations. By increasing the contact area between the base 1 and the machine tool worktable, the center of gravity distribution is optimized, the anti-overturning moment and damping characteristics of the fixture structure are improved, and the displacement or vibration of the fixture structure is reduced.
[0020] Optionally, the horizontal plate 21 is provided with at least four first screw holes 211 spaced apart, and four of the at least four first screw holes 211 are located at the four corners of the horizontal plate 21. The number of pressure blocks 31 corresponds to the number of first screw holes 211, and each pressure block 31 is provided with an oblong hole 311, the diameter of which is adapted to the first screw hole 211. Each first screw hole 211 is used to install a bolt. The bolt shank is passed downward through the oblong hole 311 of the pressure block 31 and threaded into the first screw hole 211. When the bolt is tightened, the bolt head is used to press against the top of the oblong hole 311, thereby pressing the pressure block 31 against the housing casting 6. When the bolt is loosened, the oblong hole 311 can provide the pressure block 31 with an adjustable stroke in the length direction, allowing the pressure block 31 to move flexibly within the adjustment range to adjust the position of the pressure block 31; when the bolt is tightened, the pressure block 31 can be reliably fixed in the target position.
[0021] Optionally, each side plate 22 is provided with at least two second screw holes at intervals; the lateral limiting assembly 5 includes limiting screws 51 in number corresponding to the number of second screw holes, the limiting screws 51 passing through the second screw holes and being threadedly connected to the second screw holes. The limiting screws 51 on the two side plates 22 are respectively used to abut against the inner sidewalls on both sides of the box casting 6, for lateral limiting of the box casting 6.
[0022] Optionally, the support assembly 4 includes at least four support columns 41, and four of the at least four support columns 41 are located at the four corners of the base 1. The support columns 41 are erected on the base 1. The four support columns 41 are respectively used to support the bottom four corners of the box casting 6, providing stable support for the box casting 6.
[0023] The method of using this utility model is as follows: The base 1 is placed stably on the machine tool worktable. The base 1 is fixedly connected to the machine tool worktable by T-bolts and lock nuts. Then, the box casting 6 is placed horizontally on the fixture. The connecting seat 2 passes through the inner cavity of the box casting 6. The pressure block 31 is fixedly connected to the horizontal plate 21 of the connecting seat 2 by bolts and is pressed against the top of the box casting 6. The support column 41 is supported on the bottom edge of the box casting 6 to provide stable support for the box casting 6. The limiting screws 51 on the two side plates 22 abut against the inner side walls of the two sides of the box casting 6 to perform lateral limiting of the box casting 6, thereby realizing the positioning and clamping of the box casting 6 and ensuring that the box casting 6 can be successfully finished.
[0024] It should be understood that all the above embodiments are exemplary and not restrictive. Any modifications, equivalent changes and alterations made by those skilled in the art to the specific embodiments described above under the concept of this utility model shall still fall within the scope of the technical solution of this utility model.
Claims
1. A fixture for precision machining of box-shaped castings, characterized in that: The device includes a base, a connecting seat, a clamping assembly, a support assembly, and a lateral limiting assembly. The connecting seat is integrally connected to the base and is used to pass through the inner cavity of the housing casting from bottom to top. The clamping assembly is detachably connected to the top of the connecting seat and includes multiple spaced-apart pressure blocks for clamping onto the housing casting. The support assembly is integrally connected to the base and located outside the connecting seat, and is used to support the bottom of the housing casting. The lateral limiting assembly is detachably connected to the side wall of the connecting seat and is used to abut against the inner side wall of the housing casting.
2. The fixture for precision machining of box castings according to claim 1, characterized in that: The base is provided with several mounting through holes at intervals.
3. The fixture for precision machining of box castings according to claim 1, characterized in that: The connecting seat includes a horizontal plate and two side plates. The two side plates are respectively vertically arranged on both sides of the horizontal plate. One end of each side plate is integrally connected to the horizontal plate, and the other end is integrally connected to the base. The area of the base is larger than the area of the horizontal plate.
4. The fixture for precision machining of box castings according to claim 3, characterized in that: The horizontal plate is provided with at least four first screw holes spaced apart, and the four first screw holes include four located at the four corners of the horizontal plate; the number of pressure blocks corresponds to the number of the first screw holes, and each pressure block is provided with an oblong hole, the diameter of which is adapted to the first screw hole.
5. The fixture for precision machining of box castings according to claim 3, characterized in that: Each of the side plates is provided with at least two second screw holes at intervals; the lateral limiting assembly includes limiting screws in a number corresponding to the number of the second screw holes, the limiting screws passing through the second screw holes and being threadedly connected to the second screw holes.
6. The fixture for precision machining of box castings according to claim 1, characterized in that: The support assembly includes at least four support columns, and four of the at least four support columns are located at the four corners of the base, and the support columns are erected on the base.