A clamping tool for chassis processing

Abstract

The utility model discloses a clamping frock for chassis machining, including frock gantry, set up frock mesa in frock gantry top, set up in frock mesa center area's circular positioning spare, a plurality of set up in the first pressure mechanism of circular positioning spare both sides, a plurality of including rotating handle and pressure block's second pressure mechanism, a plurality of including positioning boss and pressure pin shaft's third pressure mechanism and respectively set up in the first limiting block and second limiting block of circular positioning spare both sides, wherein circular positioning spare is circular convex structure for with the cooperation positioning of chassis workpiece center mounting hole, and the first pressure mechanism includes the pressure arm and operating lever of rotating connection through the pin shaft and fixed base, and the second pressure mechanism drives the transmission rod through rotating handle and drives the pressure block to press the chassis workpiece, and the pressure pin shaft of third pressure mechanism is used for inserting the chassis workpiece pin hole and realizes the positioning. The frock is pressed through multiple sets of pressure mechanism and realizes the accurate stable clamping of chassis in partial position.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling technology, and in particular to a clamping tooling for base frame machining. Background Technology

[0002] In the field of machining, base frame workpieces serve as the fundamental structure for bearing or supporting other components, and their machining accuracy directly affects the quality of the entire machine or subsequent assembly. Base frame workpieces are typically long, rectangular frame structures, containing various structural features such as longitudinal beams, transverse beams, support plates, and central mounting holes. During machining, they require stable clamping to ensure the accuracy of milling, welding, drilling, and other processes. Existing technologies primarily employ two methods for clamping base frame workpieces: one involves using general-purpose clamps such as vises, pressure plates, and bolts to fix the workpiece through simple clamping or holding actions; the other involves designing dedicated but functionally limited clamping devices for specific base frame processes (such as those suitable only for drilling or welding).

[0003] However, these existing clamping methods have obvious technical problems: On the one hand, general-purpose fixtures lack adaptability to the structural characteristics of the base frame workpiece, which is "long, hollow, and has many connections." Relying solely on conventional clamping or holding, it is difficult to simultaneously and accurately constrain multiple parts such as the center mounting hole, the side of the longitudinal beam, and the ends of the base frame. This leads to local deformation and displacement of the workpiece during clamping, especially under the action of external processing forces, making it difficult to guarantee the positional accuracy of the central area or structurally weak parts. On the other hand, dedicated and single-function clamping devices cannot adapt to the multiple different processing steps of the base frame. When the base frame needs to undergo multiple processing steps such as milling, welding, and drilling, it is necessary to frequently change tooling or manually adjust the clamping position. This not only increases the process flow time but also introduces cumulative errors due to multiple clamping, reducing processing efficiency and overall accuracy consistency. Utility Model Content

[0004] The technical problem to be solved by this utility model is that in the existing base frame processing clamping methods, the general-purpose fixtures lack adaptability to the "long strip, multiple hollows, and multiple connecting parts" structure of the base frame, making it difficult to accurately constrain multiple parts at the same time, which leads to easy deformation and displacement of the workpiece. The special fixtures have single functions, require frequent tooling changes for multiple processes, which introduces cumulative errors. In addition, the manual operation has poor consistency and high labor intensity, which cannot guarantee the processing accuracy and efficiency of the base frame.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A clamping fixture for base frame machining includes: The tooling frame has a frame-like structure. Tooling tabletop, located on top of the tooling frame; A circular positioning component is located in the center area of ​​the tooling table. It is a circular protrusion structure used to mate with the center mounting hole of the base workpiece for positioning. Multiple first clamping mechanisms are arranged on both sides of the circular positioning member. Each first clamping mechanism includes a fixed base, a pin, a clamping arm, and an operating lever. The clamping arm is rotatably connected to the fixed base through the pin. Multiple second clamping mechanisms, which are manual clamping assemblies, are used to clamp the base frame workpiece; Multiple third clamping mechanisms, each of which includes a positioning boss, a clamping pin, and a pin seat, wherein the clamping pin is used to insert into the pin hole of the base workpiece to achieve positioning; The first limiting block and the second limiting block are respectively set on both sides of the circular positioning component.

[0006] Preferably, the tooling also includes multiple support frames, which are C-shaped and spaced apart along the length of the tooling frame. Each support frame includes a foot and a support part, which is connected to the tooling frame and the tooling table surface.

[0007] Preferably, the bottom surface of the circular positioning component is fixed to the tooling table by pads, and the pads are arranged in the four directions of the circular positioning component.

[0008] Preferably, the first clamping mechanism is a rotary clamping clamp, the operating lever drives the clamping arm to rotate around the pin shaft, and the front end of the clamping arm is provided with a clamping surface that matches the shape of the longitudinal beam of the workpiece on the base frame.

[0009] Preferably, each second clamping mechanism includes a rotating handle, a transmission rod, a clamping block, and a bracket. The bracket is fixed on the tooling table, the transmission rod passes through the bracket and is connected to one end of the rotating handle, and the clamping block is installed on the other end of the transmission rod and has a clamping surface that matches the shape of the corresponding part of the base frame workpiece.

[0010] Preferably, each third clamping mechanism includes two pin seats, which are coaxially arranged on the positioning boss, and the clamping pin is fixedly installed on the positioning boss through the pin seats.

[0011] Preferably, it also includes a subordinate clamping assembly, which is disposed in the area corresponding to the first end plate and the second end plate, including a vertical end seat and a clamping plate disposed on the vertical end seat. The vertical end seat is vertically mounted on the tooling table and is used to assist in clamping the end plate of the base frame workpiece.

[0012] Preferably, both the first limiting block and the second limiting block are block structures, which are detachably fixed to the tooling table by bolts to limit the displacement of the base frame workpiece along the length direction of the tooling table.

[0013] The beneficial effects of this utility model include the following: By precisely matching the circular positioning component at the center of the tooling table with the central mounting hole of the base frame workpiece, and combining multiple first clamping mechanisms to clamp the longitudinal beam on both sides, multiple second clamping mechanisms for manual clamping, and multiple third clamping mechanisms for pin positioning, a multi-dimensional clamping system of "center positioning, two-side clamping, and multi-point constraint" is formed. This achieves precise positioning and stable clamping of the base frame workpiece's "long strip, multiple hollows, and multiple connecting parts" structural characteristics. It effectively solves the problems of local deformation and displacement that easily occur when clamping the base frame workpiece, as well as the difficulty in ensuring the positional accuracy of the central area, and significantly improves clamping stability and machining accuracy.

[0014] By setting up a first clamping mechanism with a manual operating lever, a second manual clamping mechanism, and a third clamping mechanism with a clamping pin, a comprehensive clamping system combining multiple clamping methods is formed. This system enables coordinated clamping of multiple key parts of the base frame workpiece, such as longitudinal beams, transverse beams, and end plates. It is compatible with various processing operations such as milling, welding, and drilling, and solves the problems of poor tooling adaptability, long process flow time, and cumulative errors introduced by multiple clamping operations when processing the base frame in multiple processes. This significantly improves processing efficiency and overall accuracy consistency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the clamping fixture used for base frame processing in Example 1; Figure 2 This is a schematic diagram of the structure of the base frame workpiece in the embodiment; Figure 3 This is a schematic diagram of the first clamping mechanism in Example 1; Figure 4 This is a schematic diagram of the second clamping mechanism in Example 1; Figure 5 This is a schematic diagram of the third clamping mechanism in Example 1.

[0016] Reference numerals: 1. Tooling frame; 2. Tooling table surface; 3. Support frame; 31. Foot pad; 32. Support part; 4. Circular positioning component; 41. Pad block; 5. First clamping mechanism; 51. Fixed seat; 52. Pin shaft; 53. Clamping arm; 54. Operating lever; 6. Second clamping mechanism; 61. Rotating handle; 62. Transmission rod; 63. Clamping block; 64. Bracket; 7. Third clamping mechanism; 71. Positioning boss; 72. Clamping pin shaft; 73. Pin seat; 8. Subordinate clamping assembly; 81. Vertical end seat; 82. Clamping plate; 9. First limiting block; 10. Second limiting block; 11. Base frame workpiece; 111. First longitudinal beam; 112. Second longitudinal beam; 113. First end plate; 114. Second end plate; 115. First crossbeam; 116. Second crossbeam; 12. Pin hole. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0018] See appendix Figure 1-5 A clamping fixture for base frame machining includes a fixture frame 1, a fixture table 2, multiple support frames 3, a circular positioning component 4, multiple first clamping mechanisms 5, multiple second clamping mechanisms 6, multiple third clamping mechanisms 7, a first limiting block 9, a second limiting block 10, and subordinate clamping components 8. This clamping fixture is mainly used for stable clamping of base frame workpieces 11, and is suitable for various machining processes such as milling, welding, and drilling. It can achieve precise positioning and reliable clamping of the base frame workpiece 11, which has a "long strip shape, multiple hollows, and multiple connecting parts" structural characteristics.

[0019] The fixture frame 1 is a rectangular frame, with its length parallel to the longitudinal axis of the base workpiece 11. Its width is sufficient to accommodate the complete placement of the base workpiece 11 and the arrangement of the clamping mechanisms on both sides. The fixture table 2 is mounted on top of the fixture frame 1 and is a flat plate structure, connected to the fixture frame 1 by welding or bolts to form an integral unit. The surface of the fixture table 2 is machined flat, serving as the direct bearing and positioning reference surface for the base workpiece 11.

[0020] The support frames 3 are all C-shaped structures, with a total of eight, four spaced apart on each side along the length of the tooling frame 1. Each support frame 3 has a foot 31 at its bottom, contacting the ground, and a support section 32 in the middle. The bottom surface of the support section 32 is in contact with the bottom surface of the tooling frame 1, and the top surface of the support section 32 is in contact with the bottom surface of the tooling table 2. The support frames 3 are connected to the tooling frame 1 and the tooling table 2 by welding, forming a stable triangular support structure that provides reliable support and stability for the entire tooling, ensuring that no deformation or vibration occurs during clamping and processing.

[0021] The circular positioning component 4 is located in the central area of ​​the tooling table 2. It is a circular protrusion structure, and its inner ring contour is precisely matched with the outer circumference of the central mounting hole of the base workpiece 11. The bottom surface of the circular positioning component 4 is welded and fixed to the tooling table 2 by four pads 41. The pads 41 are trapezoidal in shape and are distributed in the four directions of the circular positioning component 4 to form a stable support.

[0022] See Figures 1-3The first clamping mechanism 5 is a rotary clamping clamp with a manual operating lever 54. Four clamping mechanisms are provided, located on both sides of the circular positioning member 4. Each first clamping mechanism 5 includes a fixed base 51, a pin 52, a clamping arm 53, and an operating lever 54. The fixed base 51 is connected to the tooling table 2 by bolts. The pin 52 is horizontally positioned in the fixed base 51. The clamping arm 53 is rotatably connected to the fixed base 51 via the pin 52. The operating lever 54 is fixed to the clamping arm 53. The operating lever 54 drives the clamping arm 53 to rotate downwards around the pin 52. The front end of the clamping arm 53 has a clamping surface adapted to the shape of the longitudinal beam of the base frame workpiece 11, which can firmly clamp the first longitudinal beam 111 and the second longitudinal beam 112 of the base frame workpiece 11 onto the tooling table 2.

[0023] See Figure 1 , Figure 2 and Figure 4 The second clamping mechanism 6 is a manual clamping assembly, with seven in total, used to clamp different parts of the base frame workpiece 11. Each second clamping mechanism 6 includes a rotating handle 61, a transmission rod 62, a clamping block 63, and a bracket 64; the bracket 64 is fixed on the tooling table 2, the transmission rod 62 passes through the bracket 64 and is connected to one end of the rotating handle 61, and the clamping block 63 is installed on the other end of the transmission rod 62 and has a clamping surface that matches the shape of the corresponding part of the base frame workpiece 11; when the rotating handle 61 is operated to rotate it, the clamping block 63 can be moved axially through the transmission rod 62. Two second clamping mechanisms 6 are respectively disposed on both sides of the base frame workpiece 11 to clamp the first longitudinal beam 111 and the second longitudinal beam 112; one second clamping mechanism 6 is disposed opposite to the third clamping mechanism 7 that clamps the first end plate 113 to assist in clamping the first end plate 113; two second clamping mechanisms 6 are disposed on one side near the second end plate 114 of the base frame workpiece 11 to clamp the second end plate 114.

[0024] See Figure 1 , Figure 2 and Figure 5 The third clamping mechanism 7 is an integrated positioning and clamping structure, with four in total, used to clamp and fix the first end plate 113, the first crossbeam 115, the second end plate 114, and the second crossbeam 116 of the base frame workpiece 11. Each third clamping mechanism 7 includes a positioning boss 71, a clamping pin 72, and two pin seats 73. The positioning boss 71 is fixed on the tooling table 2, and the two pin seats 73 are coaxially arranged on the table of the positioning boss 71. The clamping pin 72 is installed on the positioning boss 71 through the pin seats 73. The clamping pins 72 of the four third clamping mechanisms 7 extend into the pin holes 12 opened on the first end plate 113, the first crossbeam 115, the second end plate 114, and the second crossbeam 116, respectively, to further realize the positioning of the base frame workpiece 11.

[0025] The subordinate clamping assembly 8 is disposed on both sides of the second clamping mechanism 6 that clamps the first end plate 113, and on one side of the second clamping mechanism 6 that clamps the second end plate 114. It includes a vertical end seat 81 and a clamping plate 82 disposed on the vertical end seat 81. The vertical end seat 81 is vertically mounted on the tooling table 2. The subordinate clamping assembly 8 is used to assist in clamping the first end plate 113 and the second end plate 114, thereby enhancing the stability and reliability of clamping.

[0026] The first limiting block 9 and the second limiting block 10 are respectively set on both sides of the circular protrusion structure. Both are block structures and are detachably fixed to the tooling table 2 by bolts. They are used to limit the displacement of the base frame workpiece 11 along the length direction of the tooling table 2 and prevent axial movement during processing.

[0027] Each clamping component is connected to the tooling table 2 by welding or bolting to form a stable assembly relationship. Welded connections are used for fasteners that bear large loads, such as the circular positioning component 4 and the fixing seat 51 of the first clamping mechanism 5; bolted connections are used for components that need to be adjusted or replaced, such as the limit blocks 9 and 10.

[0028] The entire clamping fixture forms a multi-dimensional clamping system of "center positioning, bilateral clamping, and end limiting". The circular positioning component 4, through precise engagement with the center mounting hole of the base frame workpiece 11, establishes the basic positioning reference for the workpiece. The first clamping mechanism 5, the second clamping mechanism 6, and the third clamping mechanism 7 work together to clamp key components of the base frame workpiece 11, such as the longitudinal beams, transverse beams, and end plates, from different angles and directions, forming a stable clamping state. Limiting blocks 9 and 10 restrict the axial displacement of the workpiece, ensuring the accuracy of the overall position. The various clamping mechanisms cooperate to simultaneously and effectively constrain multiple parts of the base frame workpiece 11, preventing local deformation and overall displacement.

[0029] The working principle and method of the above-mentioned clamping fixture for base frame processing are as follows: The first step is to place the base frame workpiece 11 stably on the tooling table 2, aligning the center mounting hole of the workpiece with the circular positioning part 4 at the center of the tooling table 2, and slowly lower it until the outer ring of the positioning part 4 fits into the inner ring of the mounting hole, thus completing the center reference positioning.

[0030] The second step involves implementing multi-dimensional tightening measures in stages: Operate the first clamping mechanism 5: sequentially turn the manual operating levers 54 of the four first clamping mechanisms 5 to drive the clamping arm 53 to rotate downward around the pin 52 until the matching clamping surface at the front end of the clamping arm 53 is in contact with the upper surface of the first longitudinal beam 111 and the second longitudinal beam 112 of the base frame workpiece 11. Continue to turn the operating levers 54 to the locking position to firmly press the longitudinal beams onto the tooling table 2, forming a preliminary fixation from both sides.

[0031] Activate the second clamping mechanism 6: Operate the rotating handles 61 of the seven second clamping mechanisms 6 in sequence. By rotating the rotating handles 61, the transmission rod 62 is driven, causing the clamping block 63 at the other end of the transmission rod 62 to move axially to the clamping position. Two of the second clamping mechanisms 6 clamp the sides of the first longitudinal beam 111 and the second longitudinal beam 112, one second clamping mechanism 6 provides auxiliary clamping to the first end plate 113, two second clamping mechanisms 6 clamp the second end plate 114, and the remaining two second clamping mechanisms 6 clamp the first cross beam 115 and the second cross beam 116 respectively. Simultaneously, the clamping plate 82 of the subordinate clamping assembly 8, pushed by the second clamping mechanisms 6, also abuts against the sides of the first end plate 113 and the second end plate 114.

[0032] Operate the third clamping mechanism 7: Insert the clamping pins 72 of the four third clamping mechanisms 7 into the pin holes 12 of the first end plate 113, the first crossbeam 115, the second end plate 114, and the second crossbeam 116 of the base frame workpiece 11, respectively, and achieve precise positioning through the precise cooperation between the pins 72 and the pin holes 12.

[0033] Thirdly, after completing the above clamping, the base frame workpiece 11 forms a stable clamping state through multi-dimensional constraints of "center positioning + clamping by the longitudinal beams on both sides + multi-point fixing of the crossbeam and end plate + axial limiting". At this time, milling, welding, drilling and other processing operations can be performed on the workpiece. The overall rigidity of the tooling and the synergistic effect of each clamping mechanism can effectively resist external forces during processing, avoid workpiece displacement or deformation, and ensure processing accuracy.

[0034] Fourth, after processing is completed, release the clamps in the reverse order of clamping: pull out the clamping pin 72 of the third clamping mechanism 7; reverse the rotation handles 61 of each of the second clamping mechanisms 6 to retract the clamping blocks 63 to the non-clamping position; finally, move the operating lever 54 of the first clamping mechanism 5 to lift the clamping arm 53 and release the longitudinal beam constraint. At this point, the workpiece can be easily removed from the tooling table 2, completing one processing cycle.

[0035] The entire operation process, through standardized step-by-step operations and the coordinated clamping of multiple mechanisms, not only ensures the positioning accuracy and clamping stability of the base frame workpiece 11, but also takes into account the convenience of operation. It can effectively adapt to various processing procedures and improve production efficiency.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any innovative improvements or substitutions based on this utility model should fall within the scope of the claims of this utility model. Furthermore, the parameters, materials, and processes mentioned in the above embodiments are not unique. Without departing from the technical essence of this utility model, those skilled in the art can make various alternative choices, and these alternative solutions should also be considered to fall within the scope of protection of this utility model.

Claims

1. A clamping fixture for machining a base frame, characterized in that, include: The tooling frame has a frame-like structure. Tooling tabletop, located on top of the tooling frame; A circular positioning component is located in the center area of ​​the tooling table. It is a circular protrusion structure used to mate with the center mounting hole of the base workpiece for positioning. Multiple first clamping mechanisms are arranged on both sides of the circular positioning member. Each first clamping mechanism includes a fixed base, a pin, a clamping arm, and an operating lever. The clamping arm is rotatably connected to the fixed base through the pin. Multiple second clamping mechanisms, which are manual clamping assemblies, are used to clamp the base frame workpiece; Multiple third clamping mechanisms, each of which includes a positioning boss, a clamping pin, and a pin seat, wherein the clamping pin is used to insert into the pin hole of the base workpiece to achieve positioning; The first limiting block and the second limiting block are respectively set on both sides of the circular positioning component.

2. The clamping fixture for base frame processing according to claim 1, characterized in that, It also includes multiple support frames, which are C-shaped and distributed at intervals along the length of the tooling frame. Each support frame includes a foot and a support part, which is connected to the tooling frame and the tooling table surface.

3. The clamping fixture for base frame processing according to claim 1, characterized in that, The bottom surface of the circular positioning component is fixed to the tooling table by pads, which are arranged in four directions of the circular positioning component.

4. The clamping fixture for base frame processing according to claim 1, characterized in that, The first clamping mechanism is a rotary clamping clamp. The operating lever drives the clamping arm to rotate around the pin shaft. The front end of the clamping arm is provided with a clamping surface that matches the shape of the longitudinal beam of the workpiece on the base frame.

5. The clamping fixture for base frame processing according to claim 1, characterized in that, Each second clamping mechanism includes a rotating handle, a transmission rod, a clamping block, and a bracket. The bracket is fixed on the tooling table, the transmission rod passes through the bracket and is connected to one end of the rotating handle, and the clamping block is installed on the other end of the transmission rod, having a clamping surface that matches the shape of the corresponding part of the base frame workpiece.

6. The clamping fixture for base frame processing according to claim 1, characterized in that, Each third clamping mechanism includes two pin seats, which are coaxially arranged on the positioning boss. The clamping pin is fixedly installed on the positioning boss by means of the pin seats.

7. The clamping fixture for base frame processing according to claim 1, characterized in that, It also includes a subordinate clamping assembly, which is disposed in the area corresponding to the first end plate and the second end plate. The subordinate clamping assembly includes a vertical end seat and a clamping plate disposed on the vertical end seat. The vertical end seat is vertically mounted on the tooling table and is used to assist in clamping the end plate of the base frame workpiece.

8. The clamping fixture for base frame processing according to claim 1, characterized in that, Both the first limiting block and the second limiting block are block-shaped structures and are detachably fixed to the tooling table by bolts, used to limit the displacement of the base frame workpiece along the length direction of the tooling table.

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