Clamp for fixing workpiece
By designing a fixture for fixing the workpiece, including a mounting base, clamping block, and pressure block, the problem of unstable clamping of half-section valves in the prior art is solved, and the accuracy of stress detection and the convenience of operation are achieved.
Patent Information
- Application Number
- CN202422968673.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The lack of a dedicated clamp for fixing the valve after it has been partially cut in the existing technology results in inaccurate stress detection.
A fixture including a mounting base, a clamping block, a pressure block, and a movable rod is designed. The clamping block fixes the cut workpiece through the clamping groove, and the movable rod drives the pressure block to press down vertically to press against the cut surface of the workpiece, ensuring that the cut surface of the workpiece always remains horizontal and achieving stable clamping.
It improves the accuracy of stress detection, ensures that the workpiece's cross-section does not need to be adjusted during the detection process, and the fixture structure is simple and easy to operate.
Smart Images
Figure CN223532289U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of clamping technology, specifically a clamp for fixing workpieces. Background Technology
[0002] Engine valves undergo various processes during production, including forging, quenching, tempering, turning, grinding, friction welding, and welding. During these processes, the valves are subjected to complex forces such as solid metal flow, compression, friction, torque, and thermal stress, resulting in various elastic or plastic deformations. This leads to imbalances in the internal composition and structure of the valve, generating various stresses. If the valve is not stress-relieved and is directly processed to the finished product, it will inevitably deform or even crack under stress release. Therefore, a stress relief process is incorporated into production. However, while this process can eliminate most of the internal stress, it cannot completely eliminate it. The primary purpose of the stress relief process is to control residual stress below a preset value.
[0003] To control residual stress levels, it's essential to first determine the current valve stress. This necessitates the use of residual stress detection methods. Current methods involve measuring the valve disc diameter with vernier calipers, dividing the valve axis into three equal parts, measuring and recording the three diameter values, and then pressing the valve in a balanced state as follows: Figure 1 The method described above involves slicing a metal piece to remove a stressed section. After slicing, the stress within the metal near the cut groove is relaxed. The slicing disrupts the original stress equilibrium, causing a redistribution of stress and a new stress equilibrium. This results in displacement or strain in the metal near the cut groove, and the disc diameter also changes. The disc diameter at the three previous locations is measured with calipers and recorded. By comparing the two sets of data, the strain is determined. Applying the stress calculation formula, the stress value of the valve's original stress field can be calculated. However, the above detection method has the following shortcomings: the valve is a rotating body, while the slicing involves cutting a thin sheet along the radial direction on one side of the axis. The stress and strain are reflected in the cut groove, and the measurement dimension is the disc diameter. Therefore, the calculated stress value cannot fully reflect the true value.
[0004] Therefore, there is an urgent need to develop a clamp that can hold the valve after it has been partially cut open, so as to achieve more accurate stress detection of the valve. Utility Model Content
[0005] The purpose of this invention is to provide a fixture for fixing workpieces, which aims to solve the technical problem that the lack of a dedicated fixture for fixing workpiece halves in the prior art leads to inaccurate stress values obtained from stress detection.
[0006] To achieve the above objectives, this utility model proposes a clamp for fixing workpieces, including a mounting base;
[0007] A clamping block is detachably mounted on the mounting base. The clamping block is provided with a clamping groove for placing a workpiece that has been cut along the length direction, and the cut surfaces of the workpiece are distributed upwards.
[0008] A pressure block, one end of which is movably mounted on the mounting base, and the lower surface of the other end of which is used to press against the cutting surface of the workpiece;
[0009] A movable rod is provided on the pressure block, and the movable rod is used to drive the pressure block to move up and down along the mounting base.
[0010] Preferably, the pressure block includes a first end and a second end. The first end extends vertically upward, and the top end of the first end is bent horizontally toward the side where the clamping block is located to form the second end. The mounting base is provided with vertically distributed sliding grooves. The first end is movably disposed in the sliding grooves, and the lower surface of the second end abuts against the cutting surface of the workpiece.
[0011] Preferably, the mounting base is further provided with a mounting groove, and the clamping block is disposed in the mounting groove;
[0012] The mounting base is provided with a first through hole and a second through hole on both sides of the mounting groove. The clamping block is provided with a rotating shaft with both ends of the rotating shaft extending to the outside of the clamping block. The two ends of the rotating shaft are threaded into the first through hole and the second through hole, respectively. The rotating shaft is used to drive the clamping block to rotate.
[0013] Preferably, the vertical cross-section of the clamping groove is V-shaped.
[0014] Preferably, the upper end of the clamping block has a downwardly recessed first clearance groove in the middle, and the lower part of the second end has an upwardly recessed second clearance groove, such that:
[0015] When the lower surface of the second end extends into the first clearance groove and abuts against the cutting surface of the workpiece, the top end of the clamping block extends into the second clearance groove.
[0016] Preferably, there is a movable space between the first end and the clamping block, the movable rod extends through the second end into the movable space, and the bottom end of the movable rod is threaded onto the mounting base.
[0017] Preferably, the top of the movable rod is also provided with a handle, and the edge of the handle is provided with multiple grooves for easy gripping by fingers.
[0018] Preferably, a connecting plate is detachably provided on the rear side of the mounting base, a movable groove is provided on the first end, a fixing hole is provided on the connecting plate, and a fixing rod passes through the movable groove and the fixing hole to fix the pressure block and the connecting plate.
[0019] Preferably, the mounting base is further provided with weight reduction grooves on both sides.
[0020] Preferably, the bottom end of the mounting base extends away from the connecting plate to form an elongated portion, and the elongated portion has a plurality of mounting holes, through which bolts pass to connect the mounting base to an external device.
[0021] This utility model discloses a fixture for fixing workpieces, which has the following advantages: With the installation base, clamping block, pressure block, and movable rod, the cut valve stem can be placed on the clamping groove of the clamping block. During clamping, the valve stem is tangent to the surface of the clamping groove. The movable rod drives the pressure block to press vertically downwards until the pressure block presses against the cut surface of the valve, so that the pressure block and clamping block completely clamp the valve. This achieves good clamping and fixing of the cut workpiece, ensuring that the cut surface of the workpiece always remains horizontal and upward, without requiring special adjustment during the process, thus guaranteeing the subsequent stress testing process. Furthermore, the fixture has a simple structure and is easy to operate. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the valve being sliced in traditional stress testing.
[0024] Figure 2 This is a schematic diagram of the fixture used to fix the workpiece according to this utility model;
[0025] Figure 3 This is an exploded structural diagram of the clamp used to fix the workpiece according to this utility model;
[0026] Figure 4 This is a schematic diagram of the fixture used to fix the workpiece according to this utility model from another angle.
[0027] In the attached diagram: 1-mounting base, 11-slide groove, 12-mounting groove, 13-first through hole, 14-second through hole, 15-moving space, 16-weight reduction groove, 17-extension part, 171-mounting hole, 2-clamping block, 21-clamping groove, 22-first clearance groove, 23-rotation shaft, 3-workpiece, 31-section surface, 4-pressure block, 41-first end, 411-moving groove, 42-second end, 421-second clearance groove, 5-moving rod, 51-handle, 52-groove, 6-connecting plate, 61-fixing hole.
[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0030] It should be noted that if the embodiments of this utility model involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0032] like Figures 2 to 4 As shown, a clamp for fixing a workpiece includes a mounting base 1;
[0033] A clamping block 2 is detachably mounted on the mounting base 1. The clamping block 2 is provided with a clamping groove 21, which is used to place the workpiece 3 after being cut along the length direction, and the cutting surface 31 of the workpiece 3 is distributed upward.
[0034] Pressure block 4, one end of which is movably mounted on the mounting base 1, and the lower surface of the other end of which is used to press against the cutting surface 31 of the workpiece 3;
[0035] The movable rod 5 is disposed on the pressure block 4, and the movable rod 5 is used to drive the pressure block 4 to move up and down along the mounting base 1.
[0036] The clamp in this design is particularly suitable for securing valves, especially for securing valves that have been cut open. Of course, in other embodiments, the clamp can also be used to secure other types of valves.
[0037] Specifically, the fixture for fixing the workpiece mainly consists of a mounting base 1, a clamping block 2, a pressure block 4, and a movable rod 5. In use, the mounting base 1 is first fixed at an appropriate position on the contour scanner, ensuring the valve can be scanned by the scanner (the contour scanner scans the valve horizontally). Then, the cut valve stem is placed on the clamping groove 21 of the clamping block 2. During clamping, the valve stem is tangential to the surface of the clamping groove 21. The movable rod 5 drives the pressure block 4 to press vertically downwards until the pressure block 4 presses against the cut surface 31 of the valve, completely clamping the valve with the pressure block 4 and the clamping block 2. Then, the scanning process begins. This fixture for fixing the workpiece provides excellent clamping and fixing of the cut workpiece 3, ensuring the cut surface 31 of the workpiece 3 remains horizontally upwards without requiring special adjustments during the process, thus guaranteeing the subsequent stress testing. Furthermore, the fixture has a simple structure and is easy to operate.
[0038] Typically, it is preferable to cut the valve along its central axis to obtain a half-section valve for stress testing, as the stress value test results are more accurate in this case.
[0039] Furthermore, the pressure block 4 includes a first end 41 and a second end 42. The first end 41 extends vertically upward, and the top end of the first end 41 is bent horizontally toward the side where the clamping block 2 is located to form the second end 42. The mounting base 1 is provided with vertically distributed sliding grooves 11. The first end 41 is movably disposed in the sliding grooves 11, and the lower surface of the second end 42 abuts against the cutting surface 31 of the workpiece 3.
[0040] A connecting plate 6 is detachably provided on the rear side of the mounting base 1. A movable groove 411 is provided on the first end 41, and a fixing hole 61 is provided on the connecting plate 6. A fixing rod passes through the movable groove 411 and the fixing hole 61 to fix the pressure block 4 and the connecting plate 6.
[0041] like Figure 4As shown, in this embodiment, the first end 41 of the pressure block 4 is movably disposed in the vertically distributed sliding groove 11. The size of the sliding groove 11 should be set as small as possible while ensuring that the pressure block 4 can slide. In this way, the first end 41 of the pressure block 4 can remain vertical and the second end 42 can remain horizontal. That is, it ensures that the lower surface of the second end 42 of the pressure block 4 is always parallel to the cross-sectional surface 31 of the valve, ensuring that the valve is always clamped and avoiding slight shaking.
[0042] Furthermore, the mounting base 1 is also provided with a mounting groove 12, and the clamping block 2 is disposed in the mounting groove 12;
[0043] The mounting base 1 is provided with a first through hole 13 and a second through hole 14 on both sides of the mounting groove 12. The clamping block 2 is provided with a rotating shaft and both ends of the rotating shaft extend to the outside of the clamping block 2. The two ends of the rotating shaft are threaded into the first through hole 13 and the second through hole 14 respectively. The rotating shaft is used to drive the clamping block 2 to rotate.
[0044] In this embodiment, the clamping block 2 can rotate around the rotation axis. When the pressure block 4 is pressed down to the high point of the valve's cross-section 31, the valve will rotate around its own axis during the continued pressing process, and the clamping block 2 will also rotate around the rotation axis until the bottom surface of the pressure block 4 is completely in contact with the valve's cross-section 31 and can no longer move down. This fixing method is more stable for subsequent valve scanning / detection.
[0045] Furthermore, the vertical cross-section of the clamping groove 21 is V-shaped. The V-shaped clamping groove 21 can be tangent to the arc-shaped outer surface of the workpiece 3 / valve to improve the stability of the workpiece 3 / valve within the clamping groove 21 and prevent unexpected movement of the workpiece 3 / valve within the clamping groove 21.
[0046] Furthermore, the upper end of the clamping block 2 is provided with a downwardly recessed first clearance groove 22 at the middle, and the lower part of the second end 42 is provided with an upwardly recessed second clearance groove 421, such that:
[0047] When the lower surface of the second end 42 extends into the first clearance groove 22 and abuts against the cutting surface 31 of the workpiece 3, the top end of the clamping block 2 extends into the second clearance groove 421.
[0048] In order to better clamp the valve section surface 31 with the pressure block 4, this solution is provided with a first clearance groove 22 and a second clearance groove 421 to ensure more stable clamping of the valve section surface 31.
[0049] Furthermore, there is a movable space 15 between the first end 41 and the clamping block 2, the movable rod 5 passes through the second end 42 and extends into the movable space 15, and the bottom end of the movable rod 5 is threadedly connected to the mounting base.
[0050] The outer wall of the bottom end of the movable rod 5 is provided with external threads, and the mounting base 1 is provided with threaded holes. By turning the movable rod 5, the movable rod 5 can move up and down along the mounting base, thereby driving the pressure block 4 fixed to the movable rod 5 to move up and down, thus completing the clamping or loosening of the valve.
[0051] Furthermore, the top of the movable rod 5 is also provided with a handle 51, and the edge of the handle 51 is provided with multiple grooves 52 for easy gripping by fingers.
[0052] The handle 51 located at the top of the valve allows the operator to easily turn the movable lever 5. The edge of the handle 51 is provided with a ring of grooves 52, specifically four grooves. The grooves 52 are usually arc-shaped to better fit the shape of the fingers and make it easier for the operator to grip.
[0053] Furthermore, a connecting plate 6 is detachably provided on the rear side of the mounting base 1. An elongated movable groove 411 is provided on the first end 41, and a fixing hole 61 is provided on the connecting plate 6. A fixing rod passes through the movable groove 411 and the fixing hole 61 to fix the pressure block 4 and the connecting plate 6.
[0054] The connecting plate 6 has a fixing hole 61 in the middle, and an M6 fixing rod (i.e., screw) is installed in the fixing hole 61. The first end 41 of the pressure block 4 has a long strip-shaped movable groove 411. Due to the screw restriction, the pressure block 4 will not completely disengage when it moves upward, which plays a limiting role.
[0055] Furthermore, the mounting base 1 is provided with weight-reducing grooves 16 on both sides. The weight-reducing grooves 16 reduce the weight of the mounting base 1 and save on the raw materials used in its manufacture. It should be noted that the weight-reducing grooves 16 should not affect the overall strength of the mounting base 1, ensuring the stable fixation of the clamping block 2.
[0056] Furthermore, the bottom end of the mounting base 1 extends away from the connecting plate 6 to form an extension 17. The extension 17 has several mounting holes 171 through which bolts pass to connect the mounting base 1 to an external device. The mounting base 1 is mounted externally via the extended extension 17. Because the extension 17 has multiple mounting holes 171, and bolts pass through these holes to fix it to the external device, the clamp of this design can be detachably mounted on other external devices or on the ground.
[0057] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
Claims
1. A clamp for fixing a workpiece, characterized in that, include: Mounting base (1); A clamping block (2) is detachably mounted on the mounting base (1). The clamping block (2) is provided with a clamping groove (21). The clamping groove (21) is used to place the workpiece (3) after being cut along the length direction, and the cutting surface (31) of the workpiece (3) is distributed upward. Pressure block (4), one end of which is movably disposed on the mounting base (1), and the lower surface of the other end is used to press against the cutting surface (31) of the workpiece (3); A movable rod (5) is provided on the pressure block (4), and the movable rod (5) is used to drive the pressure block (4) to move up and down along the mounting base (1).
2. A clamp for fixing a workpiece according to claim 1, characterized in that, The pressure block (4) includes a first end (41) and a second end (42). The first end (41) extends vertically upward, and the top end of the first end (41) is bent horizontally toward the side where the clamping block (2) is located to form the second end (42). The mounting base (1) is provided with vertically distributed sliding grooves (11). The first end (41) is movably disposed in the sliding grooves (11), and the lower surface of the second end (42) abuts against the cutting surface (31) of the workpiece (3).
3. A clamp for fixing a workpiece according to claim 1, characterized in that, The mounting base (1) is also provided with a mounting groove (12), and the clamping block (2) is disposed in the mounting groove (12); The mounting base (1) is provided with a first through hole (13) and a second through hole (14) on both sides of the mounting groove (12). The clamping block (2) is provided with a rotating shaft (23) and both ends of the rotating shaft (23) extend to the outside of the clamping block (2). The two ends of the rotating shaft (23) are threaded into the first through hole (13) and the second through hole (14) respectively. The rotating shaft (23) is used to drive the clamping block (2) to rotate.
4. A fixture for fixing a workpiece according to claim 1, characterized in that, The vertical cross-section of the clamping groove (21) is V-shaped.
5. A clamp for fixing a workpiece according to claim 2, characterized in that, The clamping block (2) has a downwardly recessed first clearance groove (22) at the middle of its upper end, and an upwardly recessed second clearance groove (421) at the lower part of its second end (42), such that: When the lower surface of the second end (42) extends into the first clearance groove (22) and abuts against the cutting surface (31) of the workpiece (3), the top end of the clamping block (2) extends into the second clearance groove (421).
6. A clamp for fixing a workpiece according to claim 2, characterized in that, There is a movable space (15) between the first end (41) and the clamping block (2), the movable rod (5) passes through the second end (42) and extends into the movable space (15), and the bottom end of the movable rod (5) is threaded to the mounting base (1).
7. A clamp for fixing a workpiece according to claim 1, characterized in that, The top of the movable rod (5) is also provided with a handle (51), and the edge of the handle (51) is provided with multiple grooves (52) for easy gripping by fingers.
8. A clamp for fixing a workpiece according to claim 2, characterized in that, The mounting base (1) is detachably provided with a connecting plate (6) on its rear side. The first end (41) is provided with a long strip-shaped movable groove (411). The connecting plate (6) is provided with a fixing hole (61). The fixing rod passes through the movable groove (411) and the fixing hole (61) to fix the pressure block (4) and the connecting plate (6).
9. A clamp for fixing a workpiece according to claim 1, characterized in that, The mounting base (1) is also provided with weight reduction grooves (16) on both sides.
10. A clamp for fixing a workpiece according to claim 8, characterized in that, The bottom end of the mounting base (1) extends away from the connecting plate (6) to form an extension (17). The extension (17) has a plurality of mounting holes (171). Bolts pass through the mounting holes (171) to connect the mounting base (1) to an external device.