Straightening device for elongated flexible rod-like parts

Abstract

The present application belongs to the field of product design and processing, and particularly relates to a straightening device for an elongated flexible rod part. The straightening device comprises a base, a pressing screw, a movable pressing block, a roller shaft and a roller. The present application realizes straightening of the elongated flexible rod, integrates the process method and process parameters in the device, and realizes high-quality processing.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of product design and processing, and particularly relates to a straightening device for an elongated flexible rod type part. BACKGROUND

[0002] As a key component in an electro-hydraulic servo system, the precision of a directly driven electro-hydraulic servo valve directly affects the working characteristics of the servo system as a whole. During the operation of the servo valve, the movement of a valve core is connected with a motor through an elongated flexible rod, and the straightness of the elongated flexible rod is closely related to the movement precision of the valve core.

[0003] During the processing of the elongated flexible rod, the cutting stress in the processing process and the internal stress of the raw material itself can cause the elongated flexible rod to bend and deform, thereby affecting the straightness of the part. In order to reduce the deformation, manual straightening and repeated stress relief are usually performed multiple times during the processing, which results in a long process and increases the manufacturing cost. SUMMARY

[0004] The present application is designed in view of the shortcomings of the existing elongated flexible rod processing and straightening method, and provides an elongated flexible rod type part straightening device and method, which realizes the straightening of the elongated flexible rod, integrates the process method and process parameters in the device, and realizes high-quality processing.

[0005] The technical scheme of the present application is as follows:

[0006] The present application provides an elongated flexible rod type part straightening device, which comprises a base, a pressing screw, a movable pressing block, a roller shaft and a roller.

[0007] A long through-type groove with a closed end at the lower end is designed on the base along the length direction, the through-type groove is used for installing the movable pressing block, the movable pressing block is matched with the long through-type groove and moves, and the closed end position is used for inserting a part; six small square through grooves used for installing the rollers are designed on the base along the width direction and side by side, and the six small square through grooves are respectively communicated with the closed end of the long through-type groove; a circular hole used for installing the roller shaft is arranged on the base along the length direction at both sides of the closed end position, and the circular hole is communicated with the six small square through grooves; the roller is installed on the base through the roller shaft; the roller is partially exposed at the closed end position, and the part is placed on the exposed roller;

[0008] Six through grooves used for installing the rollers are designed on the lower end of the movable pressing block along the width direction, a long circular hole used for installing the roller shaft is designed on the movable pressing block along the length direction, and the long circular hole is communicated with the six through grooves along the length direction; the roller is installed on the movable pressing block through the roller shaft; a T-shaped groove is designed on the upper end of the movable pressing block and matched with the pressing screw, the pressing screw is matched with the base through threads, and the movable pressing block can move up and down in the long through-type groove of the base by rotating the pressing screw; the roller is partially exposed downward from the movable pressing block, the exposed roller is pressed against the part by rotating the pressing screw, and the part is straightened through the rollers in three directions.

[0009] Further, the device further comprises a baffle plate;

[0010] The baffle plate is installed on both end faces of the base through two screws to prevent the movable pressing block from falling out.

[0011] Further, the device further comprises a support rod;

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

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

[0014] Further, the installation positions of the rollers on the base are spaced apart and installed in staggered positions; two groups of rollers are staggered by one slot, namely, 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 the slots of the movable pressing block.

[0015] Further, the rollers are made of quenched steel, and the hardness is HRC55-62.

[0016] Further, the gap between the roller shaft and the roller hole is 0.003mm-0.005mm.

[0017] Further, the parallelism error between the two roller shaft installation holes of the base and the roller shaft installation holes of the movable pressing block is not more than 0.05mm; the symmetry error between the two roller shaft installation holes of the base is not more than 0.05mm.

[0018] Advantages and beneficial effects of the present application: based on the analysis of the processing mode and straightening method of the slender flexible rod, the mechanism of deformation and its influencing factors are analyzed from the mechanism, and a straightening device for slender flexible rod parts is designed. The device is based on special rollers spaced apart, a certain pressure is applied on the outer circle of the slender flexible rod part through the movable pressing block, the stress state of the outer circle of the part is changed through rolling and stretching process, the stress on the outer circle is redistributed, and the purpose of straightening is achieved. The device can realize the following three functions:

[0019] 1. The present application proposes a new straightening technology for slender flexible rods.

[0020] 2. A certain stress is applied to the outer circle of the slender flexible rod through a group of specially designed rollers, the stress state of the slender flexible rod surface is changed, and the straightening purpose is achieved.

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

[0022] Figure 1An assembly drawing of a straightening device for slender, flexible rod-like parts;

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

[0024] Figure 3 Schematic diagram of clamping screw 2;

[0025] Figure 4 Schematic diagram of movable pressure block 3;

[0026] Figure 5 Schematic diagram of roller shaft 4;

[0027] Figure 6 Schematic diagram of roller 5;

[0028] Figure 7 Schematic diagram of baffle 6;

[0029] Figure 8 Schematic diagram of support rod 7;

[0030] Figure 9 This is a schematic diagram of a slender, flexible rod. Detailed Implementation

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

[0032] This invention provides a straightening device for slender, flexible rod-like parts, such as... Figures 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, and a support rod 7.

[0033] The base 1 has a long through groove 11 designed along its length for installing a movable pressure block 3. The movable pressure block 3 and the long through groove 11 slide together and can move. Six small square through grooves are used to install rollers 5. Two round holes 12 on the base 1 are used to install roller shafts 4. The rollers 5 are installed on the base 1 through the roller shafts 4.

[0034] The movable pressure block 3 is designed with six through slots 33 for mounting rollers 5 and an elongated hole 32 for mounting roller shafts 4. The rollers 5 are mounted on the movable pressure block 3 via the roller shafts 4. One end of the movable pressure block 3 is designed with a T-slot 31, which mates with the T-shaped structure 21 of the clamping screw 2. The clamping screw 2 mates with the threaded hole 14 of the base 1 via threads. The rotation of the clamping screw 2 causes the movable pressure block 3 to move up and down in the elongated through slot 11 of the base 1.

[0035] The baffle 6 is mounted on both ends of the base 1 with two screws to prevent the movable pressure block 3 from coming out. The base 1 is installed in the groove of the support rod 7 and secured with screws. The support rod 7 is used to fix the base 1 to the lathe.

[0036] The gap 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 spaced apart and misaligned.

[0038] The rollers 5 are made of quenched steel, and the hardness is HRC55-62.

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

[0040] The parallelism and symmetry error between the two holes for installing the roller shaft 4 on the base 1 and the holes for installing the roller shaft 4 on the movable pressing block 3 is not more than 0.05mm.

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

[0042] 1. The application proposes a new straightening technology for an elongated flexible rod.

[0043] 2. A certain stress is applied to the outer circle of the elongated flexible rod by a set of specially designed rollers, the stress state of the surface of the elongated flexible rod is changed, and the straightening purpose is realized.

[0044] 3. The device has a rolling finishing effect on the outer circle of the elongated flexible rod, which can improve the fatigue resistance of the elongated flexible rod.

[0045] The specific operation process is as follows:

[0046] 1. In the six square grooves 13 of the base 1, the rollers 5 are installed at an interval of one square groove, and the roller shafts 4 are installed at the same time, and the two sets of rollers are misaligned by one groove position. That is, the left side installs 1, 3, 5 groove position, and the right side installs 2, 4, 6 groove position.

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

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

[0049] 4. Install the baffle 6 on the two end faces of the base 1 and fasten it 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 hole 72.

[0051] 6. The base 1 and the support rod 7 assembly are mounted together on the lathe tool post using the square rod 73 of the support rod 7, and the center positions of the three sets of rollers of the base 1 are aligned with the center of the lathe spindle.

[0052] 7. Clamp one end of the slender flexible rod to be straightened on the lathe spindle and insert the other end into the constriction position. Through the center of the three sets of rollers in the long through groove 11 of the base 1, apply pressure with a torque wrench through the clamping screw 2. The three sets of exposed rollers press the slender flexible rod. Then start the lathe spindle and rotate it at a certain speed. At the same time, the device is moved by the lathe tool post to achieve the purpose of straightening.

[0053] Example 1

[0054] like Figure 9 As shown, this embodiment takes a flexible rod of a certain type of product as an example. The flexible rod is 230mm long, with M3 and M4 threads at both ends, and the diameter of the middle part is... Straightness requirement: not greater than Material: Stainless steel, hardness: HRC31-39.

[0055] The process involves four steps:

[0056] Step 1: Install the straightening device on the tool post 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 rail.

[0057] Step 2: Clamp one end of the slender flexible rod that needs to be straightened onto the lathe spindle, and pass the other end through the center of the three sets of rollers in the long through groove 11 of the base 1.

[0058] Step 3: Apply pressure with a torque wrench through the tightening screw 2, and the three sets of rollers will press the slender flexible rod.

[0059] Step 4: Start the lathe spindle and rotate it at a speed of 200rpm-300rpm. Simultaneously, the straightening device moves via the lathe carriage, along the flexible rod. The line moves within the diameter range at a speed of 50mm / min-100mm / min. One reciprocating motion completes the straightening process.

[0060] Example 2

[0061] This embodiment uses a slender rod of a certain type of product as an example. The slender rod is 300mm long and has a diameter of... Straightness requirement: not greater than Material: Stainless steel, hardness: HRC28-32.

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

[0063] The above merely illustrates the embodiments of the present application, but the protection scope of the present application is not limited thereto, and any improvement not essential to the present application shall be within the protection scope of the present application.

Claims

1. A straightening device for slender, flexible rod-like parts, characterized in that, Includes base (1), clamping screw (2), movable pressure block (3), roller shaft (4), and roller (5); The base (1) is designed with a long through groove (11) with a constricted end along its length. The through groove (11) is used to install the movable pressure block (3). The movable pressure block (3) slides and moves with the long through groove (11). The constricted end is used to insert parts. The base (1) is designed with six small square through grooves (13) arranged side by side along its width to install the roller (5). The six small square through grooves (13) are connected to the constricted end of the long through groove (11). The base (1) has a round hole (12) on each side of the constricted end along its length for installing the roller shaft (4). The round hole (12) is connected to the six small square through grooves (13). The roller (5) is installed on the base (1) through the roller shaft (4). The roller (5) is partially exposed at the constricted end, and the parts are placed on the exposed roller (5). The lower end of the movable pressure block (3) is designed with six through slots for mounting the roller (5) along the width direction, and an elongated hole (32) for mounting the roller shaft (4) along the length direction. The elongated hole (32) connects the six through slots along the length direction. The roller (5) is mounted on the movable pressure block (3) through the roller shaft (4). The upper end of the movable pressure block (3) is designed with a T-shaped groove to cooperate with the clamping screw (2). The clamping screw (2) is connected to the base (1) through the thread. By rotating the clamping screw (2), the movable pressure block (3) can be moved up and down in the elongated through slot of the base (1). A part of the roller protrudes downward from the movable pressure block (3). The exposed roller rotates with the clamping screw (2) to clamp the part. The part is straightened by the rollers in three directions. The base (1) is installed in the groove of the support rod (7) and fastened with screws; the support rod (7) is used to fix the base (1) on the lathe; The rollers (5) are installed at staggered intervals on the base (1); the two sets of rollers are staggered by one slot, that is, the left set is installed in slots 1, 3 and 5, and the right set is installed in slots 2, 4 and 6; the rollers (5) are installed in all slots of the movable pressure block (3).

2. The straightening device for slender flexible rod-like parts as described in claim 1, characterized in that, The device also includes: a baffle (6); The baffle (6) is installed on both ends of the base (1) by two screws to prevent the movable pressure block (3) from coming out.

3. The straightening device for slender flexible rod-like parts as described in claim 1, characterized in that, The clearance between the base (1) and the movable pressure block (3) is 0.005-0.01mm.

4. The straightening device for slender flexible rod-like parts as described in claim 1, characterized in that, The roller (5) is made of hardened steel with a hardness of HRC55-62.

5. The straightening device for slender flexible rod-like parts as described in claim 1, characterized in that, The clearance between the roller shaft (4) and the roller (5) hole is 0.003mm-0.005mm.

6. The straightening device for slender flexible rod-like parts as described in claim 1, characterized in that, The parallelism error between the two holes for mounting roller shafts (4) on the base (1) and the holes for mounting roller shafts (4) on the movable pressure block (3) is no greater than 0.05mm; the symmetry error between the two holes for mounting roller shafts (4) on the base (1) is no greater than 0.05mm.

Images