Straightening device for slender flexible rod type parts

Abstract

The invention belongs to the field of design and processing of products, and particularly relates to a straightening device for slender flexible rod parts. The straightening device comprises a base, a compression screw, a movable pressing block, a roller shaft and a roller. Straightening of the long and thin flexible rod is achieved, the technological method and technological parameters are integrated in the device, and high-quality machining is achieved.

Description

Technical Field

[0001] The invention belongs to the field of product design and processing, and particularly relates to a slender flexible rod part straightening device. Background Art

[0002] As a key component in the electro-hydraulic servo system, the accuracy of the direct-drive electro-hydraulic servo valve directly affects the overall working characteristics of the servo system. During the operation of the servo valve, the movement of the valve core is connected to the motor by a slender flexible rod, and the straightness of the slender flexible rod is closely related to the movement accuracy of the valve core.

[0003] During the processing of the slender flexible rod, due to factors such as the internal stress of the raw materials themselves, the cutting stress during the processing will cause the slender flexible rod to bend and deform, thereby affecting the straightness of the part. Usually during the processing, in order to reduce deformation, it is generally necessary to perform multiple manual straightening and repeated stress elimination, resulting in a lengthy process and increased manufacturing costs. Summary of the invention

[0004] The purpose of the present invention is to design a device and method for straightening slender flexible rod parts to address the shortcomings of existing slender flexible rod processing and straightening methods, to achieve straightening of slender flexible rods, and to integrate process methods and process parameters into the device to achieve high-quality processing.

[0005] The technical solution of the present invention is:

[0006] Provided is a slender flexible rod parts straightening device, comprising a base, a clamping screw, a movable clamping block, a roller shaft, and a roller;

[0007] A long through-shaped groove with a closed end is designed on the base along the length direction. The through-shaped groove is used to install a movable pressure block. The movable pressure block and the long through-shaped groove are slidably combined and moved, and the closed position is used to insert parts; six small square through-shaped grooves for installing rollers are designed side by side along the width direction on the base, and the six small square through-shaped grooves are respectively connected with the closed ends of the long through-shaped groove; a circular hole for installing the roller shaft is opened on both sides of the closed position along the length direction of the base, and the circular hole is connected with the six small square through-shaped grooves; the roller is installed on the base through the roller shaft; the roller part is exposed at the closed position, and the parts are placed on the exposed roller;

[0008] The lower end of the movable pressing block is designed with six through slots for installing rollers along the width direction, and an oblong hole for installing the roller shaft is designed along the length direction, and the oblong hole connects the six through slots from the length direction; the roller is installed on the movable pressing block through the roller shaft; a T-slot is designed on the upper end of the movable pressing block, which cooperates with a clamping screw, and the clamping screw cooperates with the base through a thread, and the clamping screw is rotated to allow the movable pressing block to move up and down in the long through slot of the base; a part of the roller is exposed downward from the movable pressing block, and the exposed roller rotates with the clamping screw to clamp the parts, and the parts are straightened by rollers in three directions.

[0009] Furthermore, the device also includes: a baffle;

[0010] The baffle is installed on the two end surfaces of the base by two screws to prevent the movable pressing block from falling out.

[0011] Furthermore, the device also includes: a support rod;

[0012] The base is installed in the support rod groove and fastened by screws; the support rod is used to fix the base on the lathe.

[0013] Furthermore, the clearance between the base and the movable pressing block is 0.005-0.01 mm.

[0014] Furthermore, the installation positions of the rollers on the base are staggered with each other; the two groups of rollers are staggered by one slot, that is, the left group is installed in slots 1, 3, and 5, and the right group is installed in slots 2, 4, and 6; the rollers are installed in all slots of the movable pressing block.

[0015] Furthermore, the roller is made of hardened steel with a hardness of HRC55-62.

[0016] Furthermore, the matching clearance between the roller shaft and the roller hole is 0.003mm-0.005mm.

[0017] Furthermore, the parallelism error between the two holes for mounting the roller shafts of the base and the hole for mounting the roller shafts of the movable pressing block is no more than 0.05 mm; the symmetry error between the two holes for mounting the roller shafts of the base is no more than 0.05 mm.

[0018] Advantages and beneficial effects of the present invention: Based on the analysis of the processing method and straightening method of the slender flexible rod, the present invention analyzes the deformation mechanism and its influencing factors from a mechanistic point of view, and designs a slender flexible rod part straightening device. The device is based on special rollers spaced apart from each other. A certain pressure is applied to the outer circle of the slender flexible rod part through a movable pressure block. With the help of rolling and stretching processes, the stress state of the outer circle of the part is changed, and the stress on the outer circle is redistributed to achieve the purpose of straightening. The device can achieve the following three functions:

[0019] 1. The invention proposes a new slender flexible rod straightening technology.

[0020] 2. A set of specially designed rollers is used to apply a certain stress to the outer circle of the slender flexible rod, thereby changing the stress state on the surface of the slender flexible rod and achieving the purpose of straightening.

[0021] 3. The device has a rolling and finishing effect on the outer circle of the slender flexible rod, which can improve the anti-fatigue properties of the slender flexible rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is an assembly drawing of a straightening device for slender flexible rod parts;

[0023] Figure 2 is a schematic diagram of a base 1;

[0024] Figure 3 is a schematic diagram of the compression screw 2;

[0025] Figure 4 It is a schematic diagram of the movable pressing block 3;

[0026] Figure 5 It is a schematic diagram of the roller shaft 4;

[0027] Figure 6 is a schematic diagram of a roller 5;

[0028] Figure 7 is a schematic diagram of a baffle 6;

[0029] Figure 8 is a schematic diagram of a support rod 7;

[0030] Fig. 9 Schematic diagram of a slender flexible rod. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0032] The present invention provides a device for straightening slender flexible rod parts, such as Figure 1-8 As shown, it includes a base 1, a clamping screw 2, a movable pressure block 3, a roller shaft 4, a roller 5, a baffle 6, a support rod 7,

[0033] A long through groove 11 is designed on the base 1 along the length direction for installing the movable pressure block 3. The movable pressure block 3 fits smoothly with the long through groove 11 and can move. The six small square through grooves are used to install the roller 5. The two round holes 12 on the base 1 are used to install the roller shaft 4. The roller 5 is installed on the base 1 through the roller shaft 4.

[0034] The movable pressing block 3 is designed with six through slots 33 for mounting the roller 5, and an oblong hole 32 for mounting the roller shaft 4. The roller 5 is mounted on the movable pressing block 3 through the roller shaft 4. A T-slot 31 is designed at one end of the movable pressing block 3 to cooperate with the T-slot structure 21 of the clamping screw 2. The clamping screw 2 cooperates with the threaded hole 14 of the base 1 through the thread. The rotation of the clamping screw 2 drives the movable pressing block 3 to move up and down in the long through slot 11 of the base 1.

[0035] The baffle 6 is mounted on both end surfaces of the base 1 by two screws to prevent the movable pressing block 3 from coming out. The base 1 is mounted in the groove of the support rod 7 and fastened by screws. The support rod 7 is used to fix the base 1 on the lathe.

[0036] The matching clearance between the base 1 and the movable pressing block 3 is 0.005-0.01mm.

[0037] The installation positions of the rollers 5 on the base 1 and the movable pressing block 3 are staggered and installed at intervals. The two groups of rollers are staggered by one slot, that is, slots 1, 3, and 5 are installed on the left side, and slots 2, 4, and 6 are installed on the right side.

[0038] The roller 5 is made of hardened steel with a hardness of HRC55-62.

[0039] The matching clearance between the roller shaft 4 and the roller 5 hole is 0.003mm-0.005mm.

[0040] The parallelism and symmetry errors of the two holes for mounting the roller shaft 4 of the base 1 and the hole for mounting the roller shaft 4 of the movable pressing block 3 are no more than 0.05 mm.

[0041] The device can realize the following three functions:

[0042] 1. The invention proposes a new slender flexible rod straightening technology.

[0043] 2. A set of specially designed rollers is used to apply a certain stress to the outer circle of the slender flexible rod, thereby changing the stress state on the surface of the slender flexible rod and achieving the purpose of straightening.

[0044] 3. The device has a rolling and finishing effect on the outer circle of the slender flexible rod, which can improve the anti-fatigue properties of the slender flexible rod.

[0045] The specific operation process is as follows:

[0046] 1. In the six square slots 13 of the base 1, rollers 5 are installed at intervals of one square slot, and roller shafts 4 are installed at the same time, and the two groups of rollers are staggered by one slot. That is, slots 1, 3, and 5 are installed on the left side, and slots 2, 4, and 6 are installed on the right side.

[0047] 2. Install the rollers 5 in the six grooves 33 of the movable pressing block 3, and install the roller shaft 4 at the same time, so that a total of six rollers are installed.

[0048] 3. Install the clamping screw 2 in the threaded hole 14 of the base 1, ensure that the T-shaped structure 21 of the clamping screw 2 protrudes from the long through groove 11, install the movable clamping block 3 and the roller assembly in the long through groove 11 of the base 1, and ensure that the T-shaped groove of the movable clamping block 3 cooperates with the T-shaped structure 21 of the clamping screw 2. Rotate the clamping screw 2, and the movable clamping block 3 should be able to move up and down.

[0049] 4. Install baffles 6 on both end surfaces of the base 1 and fasten them with screws.

[0050] 5. Install the base 1 assembly in the groove 71 of the support rod 7 and fasten it with screws through the screw holes 72.

[0051] 6. The base 1 and the support rod 7 are assembled together and installed on the tool rest of the lathe using the square rod 73 of the support rod 7, and the center positions of the three groups of rollers of the base 1 are aligned to be coaxial with the center of the lathe spindle.

[0052] 7. Clamp one end of the slender flexible rod to be straightened on the lathe spindle, insert the other end into the closing position, pass the three groups of roller centers through the long through groove 11 of the base 1, apply pressure with a torque wrench through the clamping screw 2, and the three groups of exposed rollers clamp the slender flexible rod. Then start the lathe spindle and rotate it at a certain speed. At the same time, drive the device to move through the lathe tool holder to achieve the purpose of straightening.

[0053] Example 1

[0054] like Fig. 9 As shown, this embodiment takes a certain type of product flexible rod as an example. The length of the flexible rod is 230mm, the two ends are M3 and M4 threads respectively, and the diameter of the middle part is The straightness is required to be no greater than Material: stainless steel, hardness HRC31-39.

[0055] There are four steps to use:

[0056] Step 1: Install the straightening device on the tool holder of the lathe, and adjust the centers of the three sets of rollers of the straightening device to be consistent with the center of the lathe and parallel to the lathe guide rails.

[0057] Step 2: Clamp one end of the slender flexible rod to be straightened on the main shaft of the lathe, and pass the other end through the centers of the three groups of rollers in the long through-type groove 11 of the base 1.

[0058] Step 3: Use a torque wrench to apply pressure through the compression screw 2, and the three sets of rollers compress the slender flexible rod.

[0059] Step 4: Start the lathe spindle and rotate it at a speed of 200-300rpm. At the same time, the lathe support plate drives the straightening device to move on the flexible rod. The machine moves within the length range of the diameter, with a moving speed of 50mm / min-100mm / min. The straightening work is completed after one reciprocating movement.

[0060] Example 2

[0061] This embodiment takes a certain type of slender rod as an example. The slender rod is 300 mm long and has a diameter of The straightness is required to be no greater than Material: stainless steel, hardness HRC28-32.

[0062] The operation steps are the same as those in Example 1.

[0063] The above descriptions are merely embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any insubstantial improvements to the present invention should fall within the protection scope of the present invention.

Claims

1. A slender flexible rod parts straightening device, characterized in that: It comprises a base (1), a clamping screw (2), a movable clamping block (3), a roller shaft (4), and a roller (5); The base (1) is designed with a long through-shaped groove (11) with a closed end at the lower end along the length direction, and the through-shaped groove (11) is used to install a movable pressure block (3), and the movable pressure block (3) and the long through-shaped groove (11) are slidably matched and moved together, and the closed position is used to insert parts; six small square through-shaped grooves (13) are designed side by side along the width direction on the base (1) for installing the roller (5), and the six small square through-shaped grooves (13) are respectively connected to the closed ends of the long through-shaped groove (11); a circular hole (12) for installing the roller shaft (4) is respectively provided on both sides of the closed position along the length direction of the base (1), and the circular hole (12) is connected to the six small square through-shaped grooves (13); the roller (5) is installed on the base (1) through the roller shaft (4); the roller (5) is partially exposed at the closed position, and the parts are placed on the exposed roller (5); The movable pressing block (3) is provided with six through slots for mounting the roller (5) along the width direction at the lower end thereof, and an oblong hole (32) for mounting the roller shaft (4) along the length direction thereof, the oblong hole (32) connecting the six through slots in the length direction; the roller (5) is mounted on the movable pressing block (3) via the roller shaft (4); a T-shaped slot is provided at the upper end of the movable pressing block (3) to cooperate with the clamping screw (2); the clamping screw (2) cooperates with the base (1) via a thread, and the clamping screw (2) is rotated to enable the movable pressing block (3) to move up and down in the long through slot of the base (1); a portion of the roller is exposed downward from the movable pressing block (3), and the exposed roller rotates with the clamping screw (2) to clamp the parts, and the parts are straightened by the rollers in three directions.

2. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The device also includes: a baffle (6); The baffle (6) is mounted on both end surfaces of the base (1) by means of two screws to prevent the movable pressing block (3) from falling out.

3. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The device also includes: a support rod (7); The base (1) is installed in the groove of the support rod (7) and is fastened by screws; the support rod (7) is used to fix the base (1) on the lathe.

4. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The matching clearance between the base (1) and the movable pressing block (3) is 0.005-0.01 mm.

5. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The installation positions of the rollers (5) on the base (1) are staggered with each other; the two groups of rollers are staggered by one slot, that is, the left group is installed at slots 1, 3, and 5, and the right group is installed at slots 2, 4, and 6; the rollers (5) are installed at all slots of the movable pressing block (3).

6. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The roller (5) is made of hardened steel with a hardness of HRC55-62.

7. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The matching clearance between the roller shaft (4) and the roller (5) hole is 0.003mm-0.005mm.

8. A slender flexible rod parts straightening device as claimed in claim 1, characterized in that: The parallelism error between the two holes of the base (1) for mounting the roller shaft (4) and the hole of the movable pressing block (3) for mounting the roller shaft (4) is no greater than 0.05 mm; the symmetry error between the two holes of the base (1) for mounting the roller shaft (4) is no greater than 0.05 mm.

Images