Ram static rigidity testing mechanism

Abstract

The utility model relates to a ram static rigidity test mechanism, including stand column and displacement sensor, stand column adopts casting molding, one side of stand column is connected with oil cylinder seat through sliding mechanism sliding, one side of oil cylinder seat is fixedly connected with hydraulic oil cylinder, the utility model relates to ram test technical field. According to the ram static rigidity testing mechanism, the static rigidity of the tested ram is obtained by testing different forces and calculating the force and displacement data, and the pressure gauge is not directly connected with the piston rod of the hydraulic oil cylinder, but is transversely limited through the guide frame, so that the pressure gauge is always kept horizontal, and the test accuracy is improved. The final test result of the pressure gauge is not affected due to the fact that the stress direction is not horizontal enough during extrusion of the hydraulic oil cylinder, the detection result is more stable, the static rigidity of the ram is accurately detected, the adaptability to the ram structure type is high, and the method is a better solution for verifying the actual application and design theory.

Description

Technical Field

[0001] The utility model relates to the technical field of ram testing, in particular to a testing mechanism for the static stiffness of a ram. Background Art

[0002] Machine tools are the mother machines of modern industrial development and an indispensable link in the manufacturing production chain. With the development and progress of various industries, the manufacturing industry has higher and higher requirements for product quality, and the standards for the parts that make up the products are constantly improving. The overall rigidity of machine tools is particularly important, which affects the accuracy, surface quality and production efficiency of parts processing.

[0003] The rigidity of a machine tool refers to its ability to resist deformation under load. If the rigidity of a machine tool is not enough, then under the action of cutting and the gravity of the machine tool itself, the various parts of the machine tool will deform due to the force, resulting in changes in the relative position of the workpiece and the tool, thereby affecting the machining accuracy and surface quality of the machine tool. The most critical part of the strength and rigidity of the machine tool is whether the design of the ram mechanism is reasonable. The ram mechanism is to ensure the mechanical rigidity and accuracy of the machine tool spindle or tool during machining extension. Generally, when the ram is extended too long, the rigidity decreases, the torque is not concentrated, and it is easy to jitter. Excellent ram rigidity plays a vital role in machining accuracy and efficiency.

[0004] The theoretical value of the ram stiffness calculated when designing the ram is inevitably different from the finished parts, resulting in the structural parameters meeting the requirements during design, but in actual application, the machine tool has problems such as poor processing quality of product parts, rough surface with chatter marks, processing volume and processing speed affected by the rigidity of the machine tool, and low processing efficiency. In addition, the static rigidity of the ram is also affected by factors such as whether the manufacturing materials are qualified and whether the assembly is correct, which all need to be verified.

[0005] Based on the above description, there is an urgent need for a testing mechanism or method to measure whether the theoretical data of the ram stiffness is consistent with the actual data, use the actual data to provide data support and verification for the theoretical design, and improve the design parameters. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a testing mechanism for the static stiffness of the slide, which is used to verify whether the static stiffness of the slide in actual application is consistent with the design theory, and to eliminate the problem that the slide stiffness does not meet the design requirements due to reasons such as its own material, assembly accuracy, etc., thereby solving the above-mentioned problems.

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a testing mechanism for the static stiffness of a ram, including a column and a displacement sensor, the column is cast, one side of the column is slidably connected to a cylinder seat through a sliding mechanism, one side of the cylinder seat is fixedly connected to a hydraulic cylinder, the piston rod end of the hydraulic cylinder is fixedly connected to a workpiece pressure block for applying pressure to the ram, the displacement sensor is installed on the side of the ram away from the workpiece pressure block and is coaxial with the force application point of the hydraulic cylinder, the upper and lower sides of the hydraulic cylinder are fixedly connected to guide frames, and both guide frames are connected A pressure gauge is slidably connected through the guide groove, the right side of the workpiece pressure block abuts against the left side of the pressure gauge, and the right side of the pressure gauge abuts against the left side of the slide, so as to increase the rigidity of the test mechanism itself and reduce the influence of the mechanism itself on the test results. The column is designed with a slide groove; the force-applying mechanism is composed of a hydraulic cylinder, a hydraulic joint, a hydraulic oil pipe, a workpiece pressure block, a hydraulic station and a cylinder seat. The force-applying mechanism is installed on the slide groove of the column, and the upper and lower positions of the force-applying mechanism can be adjusted through the slide groove, so as to test machine tool slides of different models and structures; this test mechanism is equipped with a hydraulic station, through the hydraulic oil pipe, hydraulic The joint is connected to the hydraulic cylinder to provide adjustable stable pressure for the force-applying mechanism. When performing the static stiffness test of the ram, the main column needs to be firmly connected to the workbench or other basic platform; after adjusting the position of the force-applying mechanism and the ram to be tested, a horizontally movable pressure gauge is set between the workpiece pressure block and the ram to be tested. The pressure gauge is used to accurately read the pressure provided by the hydraulic station and adjust the pressure output by the hydraulic cylinder so that the force applied by the force-applying mechanism to the ram meets the test requirements; on the other side of the ram, at a position coaxial with the force-applying point, a displacement sensor is installed to apply pressure to the ram. During the pressure test, the displacement of the ram is accurately read; the test is carried out by using forces of different sizes, and the static stiffness of the ram is obtained by calculating the force and displacement data. The pressure gauge is not directly connected to the hydraulic cylinder piston rod, but is laterally limited by a guide frame to keep it horizontal at all times. The final test result of the pressure gauge will not be affected by the force direction of the hydraulic cylinder being not horizontal enough during extrusion. The test result is more stable, the static stiffness of the ram can be accurately tested, and the adaptability to the ram structure type is high. It is a better solution for verifying the direction of practical application and design theory.

[0008] As a further solution of the utility model: the sliding mechanism includes a sliding groove arranged on the column and a sliding block fixed on one side of the oil cylinder seat, and the sliding block is locked on the column by a top screw.

[0009] As a further solution of the utility model: the surface of the hydraulic cylinder is fixedly connected with four elastic ropes arranged in a rectangular array around the piston rod by bolts, and the four elastic ropes are fixedly connected to the left side of the pressure gauge.

[0010] As a further solution of the utility model: the connection points between the four elastic ropes and the pressure gauge are symmetrically arranged, the force is balanced, the pressure gauge is limited by the elastic rope, and when the hydraulic cylinder piston rod is retracted, the elastic rope pulls the pressure gauge to retract.

[0011] Compared with the prior art, the utility model has the following beneficial effects: by testing with forces of different sizes, the static stiffness of the measured ram is obtained by calculating the force and displacement data, and the pressure gauge is not directly connected to the hydraulic cylinder piston rod, but is laterally limited by a guide frame to keep it horizontal at all times, and the final test result of the pressure gauge will not be affected by the force direction of the hydraulic cylinder being not horizontal enough during extrusion, the test result is more stable, the static stiffness of the ram is accurately tested, the adaptability to the ram structure type is high, and it is a better solution for verifying the direction of practical application and design theory. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the external structure of the utility model;

[0013] Figure 2 It is a structural schematic diagram of the hydraulic cylinder of the utility model.

[0014] In the figure: 1. column; 2. cylinder seat; 3. hydraulic cylinder; 4. guide frame; 5. pressure gauge; 6. slide; 7. displacement sensor; 8. guide groove; 9. bolt; 10. elastic rope; 11. workpiece pressure block. DETAILED DESCRIPTION

[0015] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0016] See also Figure 1-2The utility model provides a technical solution: a testing mechanism for the static stiffness of a ram, comprising a column 1 and a displacement sensor 7. The column 1 is cast, one side of the column 1 is slidably connected to a cylinder seat 2 through a sliding mechanism, one side of the cylinder seat 2 is fixedly connected to a hydraulic cylinder 3, the piston rod end of the hydraulic cylinder 3 is fixedly connected to a workpiece pressure block 11 for applying pressure to the ram 6, the displacement sensor 7 is installed on the side of the ram 6 away from the workpiece pressure block 11, and is coaxial with the force application point of the hydraulic cylinder 3, the upper and lower sides of the hydraulic cylinder 3 are fixedly connected to guide frames 4, and the two guide frames 4 are slidably connected to a pressure block 11 through a guide groove 8. The force gauge 5, the right side of the workpiece pressure block 11 abuts against the left side of the pressure gauge 5, and the right side of the pressure gauge 5 abuts against the left side of the slide 6, which increases the rigidity of the test mechanism itself and reduces the influence of the mechanism itself on the test results. The column 1 is designed with a slide groove; the force-applying mechanism is composed of a hydraulic cylinder 3, a hydraulic joint, a hydraulic oil pipe, a workpiece pressure block 11, a hydraulic station and a cylinder seat 2. The force-applying mechanism is installed on the slide groove of the column 1, and the upper and lower positions of the force-applying mechanism can be adjusted through the slide groove, so as to test the machine tool slide 6 of different models and structures; this test mechanism is equipped with a hydraulic station, which is connected to the hydraulic cylinder 3 through the hydraulic oil pipe, the hydraulic joint and the hydraulic cylinder 3 The main column 1 needs to be firmly connected to the workbench or other basic platform when the static stiffness test of the ram 6 is performed; after adjusting the position of the force-applying mechanism and the ram 6 to be tested, a horizontally movable pressure gauge 5 is set between the workpiece pressure block 11 and the ram 6 to be tested. The pressure gauge 5 is used to accurately read the pressure provided by the hydraulic station and adjust the pressure output by the hydraulic cylinder 3 so that the force applied by the force-applying mechanism to the ram 6 meets the test requirements; on the other side of the ram 6, at a position coaxial with the force-applying point, a displacement sensor 7 is installed to apply pressure to the ram 6 During the test, the displacement of the ram 6 is accurately read; the test is carried out by using forces of different sizes, and the static stiffness of the measured ram 6 is obtained by calculating the force and displacement data. The pressure gauge 5 is not directly connected to the piston rod of the hydraulic cylinder 3, but is laterally limited by the guide frame 4 to keep it horizontal at all times. The final test result of the pressure gauge 5 will not be affected by the fact that the force direction of the hydraulic cylinder 3 is not horizontal when squeezing. The test result is more stable, the static stiffness of the ram 6 is accurately tested, and the adaptability to the structural type of the ram 6 is high. It is a better solution for verifying the direction of practical application and design theory.

[0017] The sliding mechanism comprises a sliding groove provided on the column 1 and a sliding block fixed on one side of the oil cylinder seat 2, and the sliding block is locked on the column 1 by a top screw.

[0018] The surface of the hydraulic cylinder 3 is fixedly connected to four elastic ropes 10 arranged in a rectangular array around the piston rod by bolts 9 , and the four elastic ropes 10 are all fixedly connected to the left side of the pressure gauge 5 .

[0019] The connection points between the four elastic ropes 10 and the pressure gauge 5 are symmetrically arranged, and the force is balanced. The pressure gauge 5 is limited by the elastic ropes 10. When the piston rod of the hydraulic cylinder 3 is retracted, the elastic ropes 10 pull the pressure gauge 5 back.

[0020] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A testing mechanism for the static stiffness of a ram, comprising a column (1) and a displacement sensor (7), wherein the column (1) is formed by casting. Features: One side of the column (1) is slidably connected to a cylinder seat (2) via a sliding mechanism, one side of the cylinder seat (2) is fixedly connected to a hydraulic cylinder (3), the piston rod end of the hydraulic cylinder (3) is fixedly connected to a workpiece pressure block (11) for applying pressure to the ram (6), the displacement sensor (7) is installed on the side of the ram (6) away from the workpiece pressure block (11) and is coaxial with the force application point of the hydraulic cylinder (3), the upper and lower sides of the hydraulic cylinder (3) are fixedly connected to guide frames (4), and a pressure gauge (5) is slidably connected between the two guide frames (4) via a guide groove (8), the right side of the workpiece pressure block (11) abuts against the left side of the pressure gauge (5), and the right side of the pressure gauge (5) abuts against the left side of the ram (6).

2. A ram static stiffness testing mechanism according to claim 1, Features: The sliding mechanism comprises a sliding groove formed on the column (1) and a sliding block fixed on one side of the oil cylinder seat (2); the sliding block is locked on the column (1) by means of a top screw.

3. A ram static stiffness testing mechanism according to claim 1, Features: The surface of the hydraulic cylinder (3) is fixedly connected to four elastic ropes (10) arranged in a rectangular array around the piston rod via bolts (9), and the four elastic ropes (10) are all fixedly connected to the left side of the pressure gauge (5).

4. A ram static stiffness testing mechanism according to claim 3, Features: The connection points between the four elastic ropes (10) and the pressure gauge (5) are symmetrically arranged.

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