CN202129326U - Radial clearance adjustable double-layer roll ball spinning device - Google Patents

Abstract

The utility model provides a radial clearance adjustable double-layer roll ball spinning device, including a spinning head and a mandrel; the spinning head includes retainers, knobs, roll balls, a fixed modular ring, springs, a support and a movable modular ring; an inner surface of the knob is threaded to the support; two retainers are respectively in clearance fit with the fixed modular ring and the movable modular ring; two rows of roll balls are respectively uniformly distributed in two wedged grooves constituted by the fixed modular ring and the support and the movable modular ring and the support; the fixed modular ring and the support are in interference fit; the movable modular ring and the support are in clearance fit; an oil injecting port is provided on the support; and the mandrel is composed of a spindle, a backing pin, an unloading ring and the spring and a retainer pin provided in the spindle. The radial clearance adjustable double-layer roll ball spinning device can manufacture elongated thin wall tubular parts in batch at a high efficiency; the manufactured parts have high accuracy and low cost; and multiple-channel great-deformation spinning on the thin wall tubular parts is realized by using the spinning device in one step.

Description

Double-layer ball spinning device with adjustable radial clearance

technical field

The utility model relates to a precision manufacturing device for thin-walled pipe parts, in particular to a double-layer ball spinning with adjustable radial clearance that can realize multi-pass and large-deformation spinning of thin-walled pipe parts at one time. device.

Background technique

With the development of instrumentation and biomedical equipment industry, some slender and thin-walled rotary parts or blanks with equal cross-section or variable cross-section have appeared, and the dimensional accuracy and surface quality requirements of some parts are still very strict. For the manufacture of such parts, whether it is mechanical processing, or using dies, drawing dies for thinning and deep drawing, it is difficult to realize, or even impossible to realize. Although the ordinary rotary wheel spinning method can also realize the spinning of thin-walled tubes with equal cross-section or variable cross-section, it is powerless for precision parts with small size and high precision requirements. Ball spinning is a new metal plastic processing technology that has emerged in the past ten years. During spinning, the balls are evenly distributed along the circumference of the workpiece, and the mechanical load is relatively symmetrical, which can effectively prevent the thinning of the cylindrical shape during the spinning process. The problem of instability of parts is helpful to ensure the accuracy of the inner diameter of cylindrical parts. Therefore, ball spinning has shown its own unique advantages in the manufacture of slender and thin-walled tubular parts, and has become an advanced manufacturing process for the production of such parts. The ball spinning process is good, but due to its short history, there are very few spinning devices, and most of them have non-adjustable radial clearances. However, in practical applications, due to the limitation of material deformation, most parts need to be spun in multiple passes to achieve the final shape and size, which requires multiple sets of devices, especially for small parts that require high dimensional accuracy. For small and large parts, not only will the manufacturing error of each set of devices lead to a decrease in the dimensional accuracy of the parts, but also increase the number of clamping times of the tooling and the manufacturing cost.

Contents of the invention

The purpose of the utility model is to provide a double-layer ball spinning device with adjustable radial positions and adjustable radial gaps that can complete large deformation in one spinning.

The purpose of this utility model is achieved in that:

Including spinning head and core mold; spinning head includes cage, knob, ball, fixed mold ring, spring, bracket and moving mold ring; there are two knobs, and the inner surface of the knob is threaded with the bracket; the cage is two respectively Cooperate with the fixed mold ring and the movable mold ring, and can slide relative to each other in the axial direction, and the springs are respectively pressed to the side of the ball in the direction of spinning; the balls are two rows along the fixed mold ring and the bracket respectively. 1. The two wedge-shaped grooves formed by the movable mold ring and the bracket are evenly distributed around the circle; the fixed mold ring and the bracket are fitted according to interference; the movable mold ring and the bracket are matched according to the gap, and the two can slide relative to each other; the oil injection port is provided on the bracket ;The mandrel is composed of a mandrel, a retaining pin, a discharge ring, an internal spring of the mandrel and a fixed pin, the mandrel and the discharge ring are in clearance fit, and a stepped hole is opened in the mandrel along a direction perpendicular to the axis, the retaining pin and the core The inner spring of the shaft is installed inside the step hole, and the fixing pin is blocked at the end of the step hole.

The utility model can also include:

1. An oil injection device is installed at the oil injection port. The oil injection device is composed of an oil nozzle, a ball valve, an oil nozzle spring and a stop ring; the ball valve and the oil nozzle spring are connected together, and move along the inner hole wall of the oil nozzle with the extension and contraction of the oil nozzle spring; between the stop ring and the oil nozzle interference fit.

2. Set the handle on the knob.

3. On the outer tapered surface of the knob, there is a scale line corresponding to the scale line on the outer surface of the bracket, which can read the radial adjustment amount of the ball.

The utility model provides a double-layer ball spinning device capable of high precision, high efficiency, low cost and mass production of slender and thin-walled tubular parts with adjustable radial clearance. The advantages of this spinning device are:

1. The double-layer ball spinning device with adjustable radial clearance does not require special experimental equipment, and can be used as long as it is used on an ordinary lathe.

2. The device can produce thin-walled tubes with different wall thicknesses and different diameters by adjusting the gap between the ball and the mandrel.

3. The device can complete the spinning process of two passes only through one clamping, which not only avoids the eccentricity problem caused by the replacement of tooling, but also realizes a large amount of deformation in one spinning process, and The radial position of the ball can be precisely controlled by the knob, thus improving the working efficiency of spinning, reducing the number of tooling sets, reducing the cost of tooling design and manufacturing, and ensuring the dimensional accuracy of the parts. Long thin-walled tubular parts.

4. In addition, the device is also equipped with an oil injection device, which can ensure that the tube blank can be well and evenly lubricated at any time during the entire spinning process, so that the surface finish of the parts can be fully guaranteed. Therefore, the pipe parts processed by the device have high dimensional accuracy, good surface finish, low cost and high efficiency, and can be used for forming various materials.

Description of drawings

Figure 1 Structural diagram of spinning device;

Figure 2 Structural diagram of spinning head;

Figure 3 Structural diagram of the oil injection device;

Figure 4 core mold structure diagram;

Figure 5 Internal structure diagram of mandrel.

Detailed ways

The utility model is described in more detail below in conjunction with accompanying drawing example:

Combined with Figure 1, the set includes three parts: the spinning head, the oil injection device and the mandrel.

2, the spinning head part is composed of handle 1, cage 2 and 12, knobs 3 and 13, balls 6 and 10, fixed die ring 7, springs 8 and 16, bracket 9 and movable die ring 11. There are four handles 1, which are respectively connected with the knobs 3 and 13 with threads; two threaded holes are respectively opened on the outer surfaces of the knobs 3 and 13 for screwing in two handles, and the inner surfaces are respectively connected with the bracket 9 with threads, and the knobs 3 and 13 are threaded. The outer tapered surface of 13 is engraved with the scale line, corresponding to the scale line on the outer surface of the bracket 9, the radial adjustment amount of the ball can be read; the cages 2 and 12 are respectively matched with the mold rings 7 and 11 according to the clearance, and can be moved along the The axial direction slides relative to each other, and the springs 8 and 16 respectively press it to the side of the balls 6 and 10 in the direction of spinning to prevent the balls 6 and 10 from falling off; 7 and the support 9, the two wedge-shaped grooves formed by the movable mold ring 11 and the support 9 are evenly distributed for a week; the fixed mold ring 7 and the support 9 are fitted according to interference; the movable mold ring 11 and the support 9 are matched according to the gap, and both Relative sliding is possible.

Referring to FIG. 3 , the oil injection device is composed of a nozzle 17 , a ball valve 18 , a spring 19 and a retaining ring 20 . The ball valve 18 and the spring 19 are welded together, and can move along the inner hole wall of the oil nozzle 17 with the expansion and contraction of the spring; the retaining ring 20 and the oil nozzle 17 adopt an interference fit to prevent the ball valve 18 and the spring 19 from falling out of the hole; The lower end joint of the oil nozzle 17 is an external thread, which can be threadedly connected with the threaded hole of the support 9 on the spinning head.

4 and 5, the mandrel part is composed of mandrel 4, retaining pin 14, unloading ring 15, spring 21 and fixing pin 22 inside the mandrel, and the detailed structural relationship between each part is shown in Fig. 5. The gap between the mandrel 4 and the unloading ring 15 is matched, and the unloading ring 15 can slide on the mandrel 4 during unloading, and its end close to the billet is against the end of the tube billet to constrain the tube billet axially, and the other end It is against the step of the mandrel, so it does not move during the spinning process. When unloading, the material can be unloaded by hitting the end close to the step of the mandrel. Open a step hole along the direction perpendicular to its axis in the mandrel, stop pin 14 and spring 21 are housed inside, and the end is blocked with fixed pin 22. Wherein, the retaining pin 14 and the step hole adopt a gap fit, and the retaining pin 14 can be pressed into the hole when loading the material. After the material is loaded, the small end part will expose the surface of the mandrel under the action of the spring force and penetrate into the tube blank. In the positioning hole opened above, the tube blank is constrained in the circumferential direction; the fixed pin and the stepped hole adopt an interference fit to prevent the spring from falling out of the hole.

The use of the utility model is divided into three stages, namely the preparation stage, the spinning stage and the unloading stage.

Preparation stage: first inject a certain amount of lubricating oil into the spinning head through the oil nozzle 17 with an oil gun, the ball valve 18 will close the oil nozzle 17 under the action of the spring 19, and the lubricating oil can be injected into the ball through the gap inside the spinning head The part in contact with the tube blank. Then move the handle 1 to drive the knobs 3 and 13 to rotate, so that they can be fed axially along the support 9 respectively. The axial feed of the knob 3 can reduce the gap between the wedge-shaped groove formed by the fixed mold ring 7 and push the ball 6 to move radially toward the axis. There is more clearance to accommodate the increase in the chord length of the spherical part of the ball protruding out of the cage 2, which forces the cage 2 to move to the right and compresses the spring 8; while the axial feed of the knob 13 pushes the dynamic The mold ring 11 moves to the left along the axial direction, so that the gap between the wedge-shaped groove formed by it and the knob 13 is reduced, and the ball 10 is pushed to move radially toward the axis. At the same time, the movement of the ball 6 makes the cage 12 move to the right and makes The spring 16 is compressed. Accordingly, the position of the balls can be adjusted according to the thinning amount of the first spinning step required by the spinning process (the radial feed values of balls 6 and 10 can be read from the scales of knobs 3 and 13) . Then, install the spinning head on the chuck of the lathe spindle. Next, fix the assembled mandrel on the top of the tail of the lathe, and then set the tube blank 5 with the hole on the mandrel 4, so that the right end of the tube blank 5 is against the left end surface of the unloading ring to constrain its axial displacement. When installing the tube blank 5, because the stop pin 14 is exposed on the surface of the mandrel, the stop pin 14 should be pressed into the mandrel 4 first, and the position of the tube blank 5 should be adjusted so that the stop pin 14 penetrates the hole on it, which can prevent rotation. During the pressing process, the tube blank 5 rotates relative to the mandrel 4 .

Spinning stage: Turn on the lathe to make the spinning head rotate at high speed along with the main shaft of the lathe, and the mandrel takes the tube blank to move axially with the tail top of the lathe, so that the spinning process can be realized. After the spinning of the first working step is finished, withdraw the mandrel from the spinning head, and then further adjust the positions of the balls 6 and 10 according to the adjustment method of the first stage, and carry out the spinning of the second working step according to the above method , and so on, until the required part size is screwed.

Unloading stage: After the forming process is completed, the tail top with the core mold and the tube blank 6 is withdrawn from the spinning head, and the stop pin 14 on the mandrel 4 is first pressed into the mandrel with a tool, and then along the Beat the right end of the unloading ring 14 axially to make it slide axially toward the loading end of the tube blank 5, and then drive the tube blank 5 to slide axially together to realize unloading.

This completes the entire spinning forming process.

An application example of the utility model is: forming aluminum alloy thin-walled tubes. The size parameters of the thin-walled tube are: the inner diameter is 30mm, the wall thickness is 1mm, and the length is 210mm. The inner diameter of the original tube blank used is 30mm, the wall thickness is 2.5mm, the length is 120mm, and the effective spinning length is 100mm. When spinning, the anti-rotation method shown in Figure 1 is used to form. Before spinning, pour a 30° chamfer on the spinning end of the tube blank, the purpose is to make the ball easy to bite in during spinning, and open a hole with a diameter of 5mm at the spinning end for positioning. The part is formed by three passes of spinning, the thinning amount of each layer of balls in each pass is 0.25mm, the total thinning amount of each pass is 0.5mm, and the total thinning amount of three passes is 1.5mm After the spinning is completed, cut off the unspun part of the terminal of the spinning part.

Claims (5)

1. A double-layer ball spinning device with adjustable radial clearance, including a spinning head and a mandrel; it is characterized in that: the spinning head includes a cage, a knob, a ball, a fixed die ring, a spring, a bracket and a moving die There are two knobs, and the inner surface of the knob is threadedly connected with the bracket; the two cages are respectively matched with the fixed mold ring and the movable mold ring, and can slide relative to each other in the axial direction. The spring presses it to the side of the ball; two rows of balls are evenly distributed along the two wedge-shaped grooves formed by the fixed mold ring and the bracket, and the movable mold ring and the bracket; the fixed mold ring and the bracket are press fit; The ring and the bracket are matched according to the gap, and the two can slide relative to each other; there is an oil injection port on the bracket; the mandrel is composed of a mandrel, a stop pin, a discharge ring, an internal spring of the mandrel and a fixed pin, and the mandrel and the discharge ring Clearance fit, a step hole is opened in the mandrel along the direction perpendicular to the axis, the stop pin and the inner spring of the mandrel are installed inside the step hole, and the fixing pin is blocked at the end of the step hole. 2. The double-layer ball spinning device with adjustable radial clearance according to claim 1, characterized in that: an oil injection device is arranged at the oil injection port, and the oil injection device is composed of an oil nozzle, a ball valve, an oil nozzle spring and a retaining ring; the ball valve and the oil nozzle The springs are connected together and move along the inner hole wall of the nozzle with the expansion and contraction of the nozzle spring; the interference fit between the retaining ring and the nozzle. 3. The double-layer ball spinning device with adjustable radial gap according to claim 1 or 2, characterized in that: the knob is provided with a handle. 4. The double-layer ball spinning device with adjustable radial gap according to claim 1 or 2, characterized in that: there are readable balls on the outer tapered surface of the knob corresponding to the scale marks on the outer surface of the bracket The scale line of the radial adjustment amount. 5. The double-layer ball spinning device with adjustable radial gap according to claim 3, characterized in that: the outer cone surface of the knob has a diameter corresponding to the scale line on the outer surface of the bracket that can be read. To the scale line of the adjustment amount.

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