Camshaft parting line polishing mistake proofing positioning tool

Abstract

This utility model relates to the field of camshaft machining technology and provides a camshaft parting line grinding anti-misalignment positioning fixture. The fixture includes a base plate, with a top-pressure beam supported by two supporting columns on top of the base plate. Below the top-pressure beam, from front to back, are a head positioning frame, a middle positioning frame, and a tail positioning frame for providing positioning support for the camshaft. A liftable clamping block is positioned directly above the middle positioning frame. A clamping cylinder is fixedly installed above the top-pressure beam, and the clamping block is connected to the lower end of the piston rod of the clamping cylinder. The bottom surface of the clamping block and the top surface of the middle positioning frame are provided with two anti-misalignment positioning grooves, one similar in shape to the cam structure in the middle part of the camshaft. This anti-misalignment positioning fixture effectively prevents the camshaft workpiece from being placed backwards when mounted on the grinding machine, and also provides safer and more reliable clamping and positioning of the camshaft, effectively improving the pass rate of camshaft grinding.

Description

Technical Field

[0001] This utility model belongs to the field of camshaft processing technology, specifically relating to a camshaft parting line grinding and error-proof positioning tooling. Background Technology

[0002] The camshaft is a crucial component of a fuel engine. The manufacturing process generally includes casting the camshaft blank and subsequent machining operations. Casting the camshaft blank involves pouring molten metal through a ladle into a camshaft forming mold for cooling and demolding. The camshaft forming mold consists of an upper and lower mold that are horizontally interlocked. Inevitably, a parting line will form around the joint between the upper and lower molds on the cast camshaft blank. This parting line needs to be smoothed out using a grinding machine. When grinding the camshaft blank, it is essential to accurately position and fix the blank, which requires the use of a camshaft positioning fixture.

[0003] Camshafts typically have multiple cam structures formed in one piece. For example, a four-cylinder engine camshaft has four cam structures. However, existing camshaft workpiece positioning fixtures are relatively simple, consisting of two support blocks at the bottom of both ends of the workpiece, with two clamping devices above them to clamp the two ends of the camshaft workpiece. These fixtures lack error prevention capabilities. When workers clamp the camshaft workpiece onto the positioning fixture of the grinding machine, human error can sometimes cause the cam structures on the workpiece to be placed in the wrong direction, or even the entire camshaft to be completely upside down. This can damage the grinding wheel or result in a defective camshaft workpiece, thus affecting the company's production efficiency and economic benefits. Therefore, it is necessary to design a camshaft parting line grinding error-proof positioning fixture that is better suited for workpiece positioning and installation on grinding machines and has error prevention capabilities. Utility Model Content

[0004] In response to the above situation, this utility model provides a camshaft parting line grinding anti-misalignment positioning fixture, which can effectively avoid the situation of the camshaft workpiece being placed in reverse when it is put on the grinding machine. At the same time, it is safer and more reliable for clamping and positioning the camshaft, and can effectively improve the pass rate of camshaft grinding.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An error-proof positioning tool for camshaft parting line grinding, comprising a workbench of a grinding machine, wherein the workbench is provided with a positioning tool for positioning and clamping a camshaft and a grinding mechanism for grinding the camshaft parting line; according to the movement direction of the camshaft, the positioning tool is slidably arranged above the workbench back and forth via an X-axis linear module, the grinding mechanism comprises two grinding wheels symmetrically arranged on left and right sides of the X-axis linear module, the two grinding wheels are respectively assembled on output shafts of two grinding motors, and the two grinding motors are each slidably arranged above the workbench left and right via a Y-axis linear module.

[0006] The positioning tool comprises a tool base plate connected above a sliding table of the X-axis linear module, two support uprights are vertically connected above the front and rear end portions of the tool base plate, a pressing cross beam is erected between upper end portions of the two support uprights, a head positioning frame, a middle positioning frame and a tail positioning frame for cooperatively forming positioning support of the camshaft are sequentially arranged below the pressing cross beam from front to back, a vertically liftable pressing clamping block is correspondingly arranged directly above the middle positioning frame, a vertically arranged pressing cylinder is fixedly installed above the pressing cross beam, the pressing clamping block is connected to a lower end of a piston rod of the pressing cylinder, and a bottom surface of the pressing clamping block and a top surface of the middle positioning frame are cooperatively provided with a first error-proof positioning groove and a second error-proof positioning groove which are contour-matched with a cam structure at the middle part of the camshaft.

[0007] Further, the head positioning frame, the middle positioning frame and the tail positioning frame are all detachable split assembly structures, the split assembly structure is formed by vertically inserting and combining a support frame body and a connecting base, the connecting base is a convex block structure, connecting through holes are vertically formed at left and right end portions of the connecting base, two convex rail long holes extending along the front-rear direction are cooperatively formed on an upper surface of the tool base plate at positions corresponding to the two connecting through holes of each connecting base, convex locking nuts capable of sliding back and forth are cooperatively arranged in the rail long holes, each connecting base is correspondingly screwed with each locking nut via locking screws penetrating through the connecting through holes; an inserting groove is formed at a top of the middle position of each connecting base, a lower portion of the support frame body is correspondingly slidably inserted into the inserting groove of each connecting base, and locking jackscrews for locking and propping against the support frame body are cooperatively arranged on left and right side walls of the inserting groove.

[0008] Preferably, a top surface of the head positioning frame is also cooperatively provided with a head positioning groove contour-matched with a lower surface of the head cam structure of the camshaft, for error prevention in the direction of the camshaft head. A top surface of the tail positioning frame is further cooperatively provided with a tail positioning groove contour-matched with a lower part of a tail end face of the camshaft, for rapid positioning of the camshaft tail end.

[0009] Furthermore, a long cylinder through hole extending in the front-to-back direction is vertically formed in the middle of the top pressure beam, through which the piston rod of the clamping cylinder moves. Two parallel screw through holes are also formed on the left and right sides of the cylinder through hole, and the cylinder body of the clamping cylinder is locked to the top pressure beam by fixing screws passing through the screw through holes. The clamping cylinder can move back and forth on the top pressure beam and can also be locked in place.

[0010] Furthermore, a hexagonal boss in the shape of a regular hexagon is integrally formed on the outer side of the middle position of the camshaft, which is used to engage an open-end wrench when the camshaft is screwed on; a grinding detection block and a boss positioning frame are respectively provided on the upper and lower sides of the hexagonal boss, the boss positioning frame is connected above the tooling base plate, and a detection cylinder is also provided above the clamping crossbeam, the grinding detection block is movably mounted on the lower end of the piston rod of the detection cylinder; the top surface of the boss positioning frame is provided with a V-shaped groove that matches the corner of the hexagonal boss, and the bottom of the grinding detection block is provided with an inverted U-shaped groove with the opening facing downward, which is used to detect the width distance between the two opposite parallel surfaces of the hexagonal boss.

[0011] This utility model also includes other components that enable its normal use, all of which are conventional means in the field. In addition, devices or components not limited in this utility model, such as camshafts, grinding machines and their worktables, X-axis linear modules, Y-axis linear modules, grinding wheels, grinding motors, etc., all adopt existing technologies in the field.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a camshaft parting line grinding anti-misalignment positioning fixture. By adding an intermediate positioning frame and a boss positioning frame, as well as corresponding liftable clamping blocks and grinding detection blocks, it can effectively avoid the situation where the camshaft head and tail are reversed or the cam structure is placed in the wrong direction when grinding the camshaft. This is because the intermediate positioning frame and the clamping block have anti-misalignment positioning grooves that are similar in shape to the intermediate cam structure. When the cam structure of the camshaft is not in the correct direction, it will not be placed stably. Moreover, the length distance from the intermediate camshaft (i.e., the intermediate positioning frame) to the head and tail ends of the camshaft is not equal. Even if the head and tail of the shaft are reversed, it cannot be inserted, thus providing absolute error prevention and ensuring the pass rate of the finished product after grinding the camshaft parting line. In addition, the tail end positioning bracket is equipped with a tail end positioning groove, and the head positioning bracket is equipped with a head positioning groove, which further improves the positioning and clamping speed and error prevention accuracy of the camshaft. Furthermore, an inverted U-shaped groove is provided below the grinding detection block to detect the width distance between the two opposite parallel surfaces of the hexagonal boss, which helps to quickly determine whether the grinding of the camshaft parting line is in place, thus improving grinding efficiency and indirectly increasing the overall production efficiency of the camshaft. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the camshaft in this utility model; Figure 2 This is a front view schematic diagram of the camshaft parting line grinding and error-proof positioning fixture in this utility model. Figure 3 for Figure 2 A top view of the anti-error positioning fixture for grinding the parting line of the middle camshaft; Figure 4 for Figure 2 A partial structural diagram of the positioning fixture; Figure 5 for Figure 4 Schematic diagram of the tail end positioning frame structure along the AA direction; Figure 6 for Figure 4 Schematic diagram of the intermediate positioning frame structure along the BB direction; Figure 7 for Figure 4 Schematic diagram of the boss positioning frame structure along the CC direction; Figure 8 for Figure 4 Schematic diagram of the head positioning frame structure along the DD direction; Figure 9 This is a photograph of the camshaft used in this utility model. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0015] It should be noted that the terms "up," "down," "front," "back," "left," "right," "inner," and "outer," which indicate directions or positional relationships, are based on the attached drawings and are used only for ease of description.

[0016] Example 1 like Figure 1-8As shown, a camshaft parting line grinding and error-proof positioning fixture includes a grinding machine worktable 1. The worktable is equipped with a positioning fixture for positioning and clamping the camshaft 32, and a grinding mechanism for grinding the camshaft parting line 321. According to the camshaft's movement direction, the positioning fixture is slidably mounted above the worktable via an X-axis linear module 2. The grinding mechanism includes two grinding wheels 3 symmetrically arranged on both sides of the X-axis linear module. The two grinding wheels are correspondingly mounted on the output shafts of two grinding motors 4. Each of the two grinding motors is slidably mounted left and right via a Y-axis linear module 5. Above the worktable, the two Y-axis linear modules drive the two grinding wheels to gradually approach the central axis of the grinder until the outer circumferential surfaces of the two grinding wheels contact the camshaft parting line, at which point grinding begins. While the grinding wheels grind, the positioning fixture, driven by the X-axis linear module, carries the camshaft back and forth slowly. Simultaneously, the two grinding wheels, driven by the Y-axis linear modules, gradually advance the grinding depth until the camshaft parting line protrusion is completely ground flat. Furthermore, the grinding wheels and the grinding motor are covered with a safety guard 6 to prevent grinding debris from flying and to protect personnel from injury.

[0017] The above-mentioned grinding machine and its worktable, X-axis linear module, Y-axis linear module, grinding wheel, grinding motor and safety guard are all existing technologies and will not be described in detail here.

[0018] The positioning fixture includes a fixture base plate 7 connected to the slide table of the X-axis linear module. Two support columns 8 are vertically connected to the upper ends of the fixture base plate. A top pressure beam 9 is erected between the upper ends of the two support columns. A head positioning frame 10, an intermediate positioning frame 11, and a tail positioning frame 12 are arranged sequentially from front to back below the top pressure beam to cooperate in providing positioning support for the camshaft. A vertically movable clamping block 13 is correspondingly arranged above the intermediate positioning frame. A vertically arranged clamping cylinder 14 is fixedly installed above the top pressure beam. The clamping block is connected to the lower end of the piston rod of the clamping cylinder. The bottom surface of the clamping block and the top surface of the intermediate positioning frame are provided with a first anti-misalignment positioning groove 15 and a second anti-misalignment positioning groove 16, which are similar in shape to the cam structure in the middle part of the camshaft.

[0019] The head positioning frame, intermediate positioning frame, and tail positioning frame are all detachable, modular assembly structures. Each modular assembly structure consists of a support frame 101 and a connecting base 102, which are connected by vertical insertion. The connecting base is a U-shaped block structure with vertically extending connecting through holes at both ends. Two U-shaped track holes 17 extending in the front-to-back direction are provided on the upper surface of the tooling base plate, corresponding to the two connecting through holes of each connecting base. A sliding U-shaped locking nut 18 is installed within each track hole. Each connecting base is screwed to the corresponding locking nut via a locking screw 19 passing through the connecting through hole. The top of each support frame has a slotted groove, and the lower part of the support frame can be slidably inserted into the slotted groove of each connecting base. The left and right side walls of the slotted groove are fitted with locking screws 20 for locking and pressing the support frame. The head positioning frame, the middle positioning frame and the tail positioning frame can be moved and adjusted in the front and back direction above the tooling base plate. The support frame of each positioning frame can also be pulled out from the connecting base and inserted into another support frame, and locked and fixed with locking screws, thereby completing the position interchange of the support frame. In addition, the front and back position of the pressing cylinder on the top pressing beam can also be slidably adjusted to adapt to the processing of camshafts of various specifications.

[0020] The top surface of the head positioning bracket is also provided with a head positioning groove 21 that resembles the lower surface of the head cam structure of the camshaft, for preventing misalignment of the camshaft head. The top surface of the tail positioning bracket is also provided with a tail positioning groove 22 that resembles the lower part of the tail end face of the camshaft, for quick positioning of the tail end of the camshaft. After the tail end of the camshaft is placed in the tail positioning groove, the camshaft is pushed backward, and the camshaft is positioned in the front-back direction.

[0021] The top pressure beam has a vertical cylinder through hole 23 extending in the front-to-back direction in the middle. The piston rod of the pressing cylinder moves through the cylinder through hole. Two parallel screw through holes 24 are also provided on the left and right sides of the cylinder through hole. The cylinder body of the pressing cylinder is locked to the top pressure beam by fixing screws 25 passing through the screw through holes.

[0022] Example 2 Based on Embodiment 1, a hexagonal boss 26 in the middle position of the camshaft is integrally formed on the outer side. This boss is used to engage an open-end wrench when the camshaft is screwed in. Since the camshaft sometimes needs to be screwed in during installation, a hexagonal boss is necessary in the middle of the camshaft. Figure 9As shown; a grinding detection block 27 and a boss positioning frame 28 are respectively provided on the upper and lower sides of the hexagonal boss. The boss positioning frame is connected to the upper part of the tooling base plate. A detection cylinder 29 is also provided above the pressing crossbeam. The grinding detection block can be lifted and installed at the lower end of the piston rod of the detection cylinder. Similarly, the piston rod of the detection cylinder also moves through the cylinder through hole of the pressing crossbeam. The cylinder body of the detection cylinder is also connected to the pressing crossbeam through the screw through hole by fixing screws. The front and rear position of the detection cylinder on the pressing crossbeam can also be moved and adjusted. The top surface of the boss positioning frame is provided with a V-shaped groove 30 that matches the corner of the hexagonal boss. The bottom of the grinding detection block is provided with an inverted U-shaped groove 31 with the opening facing downward, which is used to detect the width distance between two opposite parallel surfaces of the hexagonal boss. When the grinding detection block descends, if the hexagonal boss can smoothly engage with the inverted U-shaped groove, it indicates that the camshaft parting line grinding is complete (i.e., the camshaft parting line protrusion has been ground smooth); otherwise, grinding needs to continue. This setting eliminates the need for frequent manual operations using calipers in the traditional grinding process, reducing the workload of workers and helping to improve grinding efficiency.

[0023] The technical solution of this utility model is not limited to the specific embodiments described above. Without departing from the scope and spirit of the described embodiments, many modifications and changes will be obvious to those skilled in the art. Any technical modifications made within the spirit and principles of this utility model shall fall within the protection scope of this utility model.

Claims

1. A camshaft parting line grinding and error-proof positioning fixture, comprising a grinding machine worktable, wherein a positioning fixture for positioning and clamping the camshaft is provided on the worktable, and a grinding mechanism for grinding the camshaft parting line, wherein the positioning fixture is slidably mounted above the worktable via an X-axis linear module according to the camshaft's movement direction, and the grinding mechanism comprises two grinding wheels symmetrically arranged on both sides of the X-axis linear module, the two grinding wheels being correspondingly mounted on the output shafts of two grinding motors, and each of the two grinding motors being slidably mounted above the worktable via a Y-axis linear module, characterized in that: The positioning tool comprises a tool bottom plate connected above the sliding table of the X-axis linear module. Two support columns are vertically connected above the front and rear ends of the tool bottom plate, a pressing cross beam is erected between the upper ends of the two support columns, and below the pressing cross beam, a head positioning frame, a middle positioning frame and a tail end positioning frame for cooperatively positioning and supporting the camshaft are sequentially arranged from front to back. A pressing clamping block capable of lifting up and down is arranged directly above the middle positioning frame, a vertically arranged pressing cylinder is fixedly installed above the pressing cross beam, the pressing clamping block is connected to the lower end of the piston rod of the pressing cylinder, and the bottom surface of the pressing clamping block and the top surface of the middle positioning frame are cooperatively provided with a first error-proof positioning groove and a second error-proof positioning groove which are contoured to the cam structure at the middle part of the camshaft.

2. The camshaft parting line grinding and error-proof positioning fixture according to claim 1, characterized in that: The head positioning frame, the middle positioning frame and the tail end positioning frame are all detachable split assembly structures. The split assembly structure is formed by vertically inserting and combining a support frame body and a connecting base. The connecting base is a convex block structure, and connecting through holes are vertically opened at the left and right ends of the connecting base. Two convex rail long holes extending along the front-rear direction are cooperatively opened at positions on the upper surface of the tool bottom plate corresponding to the two connecting through holes of each connecting base, convex locking nuts capable of sliding back and forth are cooperatively arranged in the rail long holes, and each connecting base is correspondingly screwed with each locking nut through locking screws penetrating through the connecting through holes.

3. The camshaft parting line grinding and error-proof positioning fixture according to claim 2, characterized in that: An inserting groove is opened at the top of the middle position of each connecting base, the lower part of the support frame body is correspondingly slidably inserted into the inserting groove of each connecting base, and locking jackscrews for locking and propping against the support frame body are cooperatively arranged on the left and right side walls of the inserting groove.

4. The camshaft parting line grinding and error-proof positioning fixture according to claim 1, characterized in that: A cylinder long through hole extending along the front-rear direction is vertically opened in the middle of the pressing cross beam, and the piston rod of the pressing cylinder movably passes through the cylinder long through hole.

5. The camshaft parting line grinding and error-proof positioning fixture according to claim 4, characterized in that: Two screw long through holes parallel to the cylinder long through hole are respectively opened on the left and right sides of the cylinder long through hole, and the cylinder body of the pressing cylinder is locked and connected with the pressing cross beam through fixing screws penetrating the screw long through holes.

6. The camshaft parting line grinding and error-proof positioning fixture according to claim 1, characterized in that: A regular hexagonal hexagonal boss is also integrally formed on the outer side of the middle position of the camshaft, for clamping an open-end wrench when screwing the camshaft; a grinding detection block and a boss positioning frame are respectively arranged on the upper and lower sides of the hexagonal boss, the boss positioning frame is connected above the tool bottom plate, a detection cylinder is also arranged above the pressing cross beam, and the grinding detection block is liftably installed at the lower end of the piston rod of the detection cylinder.

7. The camshaft parting line grinding and error-proof positioning fixture according to claim 6, characterized in that: The top surface of the boss positioning frame is provided with a V-shaped groove matching with the corner of the hexagonal boss, and the bottom of the grinding detection block is provided with an inverted U-shaped groove with a downward opening, which is used for detecting the width distance between two opposite parallel surfaces of the hexagonal boss.

Images