Special lathe for hub machining

Abstract

The utility model relates to a special lathe for hub machining, its characterized in that: including the lathe bed for hub turning, the spindle box of being established on lathe bed and being established on lathe bed and being located at least two guide rails for supporting tool rest support plate of spindle box single side, the through slot or the sunken groove of being located in the front of spindle box is equipped on lathe bed, to be used for avoiding the rotation of hub and can reduce the height of spindle box tool rest, the first end of two guide rails extends to or extends close to the rear end of spindle box, to make the cutting tool of being installed on tool rest support plate can process to the wall surface of hub near spindle box side. The special lathe for hub machining reasonable in design is favorable to reduce the height of spindle box and tool rest, and can conveniently process the wall surface of hub near spindle box side.

Description

Technical fields:

[0002] This utility model relates to a special lathe, and more particularly to a special lathe for wheel hub machining. Background technology:

[0004] A wheel hub is a cylindrical metal component that supports the tire and is centrally mounted on the axle of a car; it can also be called a wheel rim, steel rim, wheel, or tire rim. A lathe is required for machining or repairing wheel hubs. Although there are now special lathes for wheel hub machining, these special lathes are simply modified traditional lathes with unreasonable designs. This results in the wheel hub's rotation center and the tool holder used for cutting being too high, causing instability in the machining process and high equipment manufacturing costs.

[0005] In addition, the special lathes currently used for wheel hub machining cannot machine the wall surface of the wheel hub near the spindle box because the movement trajectory of the tool holder plate is limited. Summary of the Invention:

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a special lathe for wheel hub processing. The special lathe for wheel hub processing is reasonably designed, which is conducive to reducing the height of the headstock and tool post, and can facilitate the processing of the side wall of the wheel hub near the headstock.

[0008] The technical solution of this utility model:

[0009] This utility model relates to a special lathe for machining wheel hubs, characterized in that it includes a lathe bed for turning wheel hubs, a headstock mounted on the lathe bed, and at least two guide rails mounted on the lathe bed and located on one side of the headstock for supporting a tool holder. The lathe bed has a through groove or countersunk groove in front of the headstock to avoid interfering with the rotation of the wheel hub and to reduce the height of the headstock and tool holder. The first ends of the two guide rails extend to or near the rear end of the headstock so that the cutting tool mounted on the tool holder can machine the wall surface of the wheel hub near the headstock.

[0010] Preferably, the spindle box and the two guide rails are respectively fixed to the lathe bed, or the spindle box and the two guide rails are fixed together as one unit.

[0011] Preferably, the spindle box and the two guide rails are fixed on a panel, and the panel is bolted or welded to the lathe bed. The through groove or countersunk groove is provided on the panel.

[0012] Preferably, the lathe bed is also provided with guide rails on the other side opposite to the two guide rails.

[0013] Preferably, a flange body is provided on the central shaft of the aforementioned spindle box. The flange body is provided with multiple elongated countersunk holes for adapting to flange holes of different models of wheel hubs. The length direction of each elongated countersunk hole is arranged radially along the flange body. There are three sets of elongated countersunk holes. The first set has three circumferentially distributed elongated countersunk holes, which are used to adapt to wheel hubs with 6 circumferentially distributed flange holes. The second set has three elongated countersunk holes, which are used to adapt to wheel hubs with 5 circumferentially distributed flange holes. The third set has at least two elongated countersunk holes, which are used to adapt to wheel hubs with 4 circumferentially distributed flange holes. The two elongated countersunk holes in the third set are one elongated countersunk hole from the first set and one from the second set. The elongated countersunk holes on the flange body do not interfere with each other.

[0014] Preferably, the flange body has a through hole at its center for fitting onto the central shaft, and elongated countersunk holes are provided around the through hole. The central shaft is a stepped shaft, and bolt holes are provided on the stepped end face of the stepped shaft. The flange body and the central shaft are fixed by connecting bolts to the bolt holes. Alternatively, the flange body has a threaded hole at its center for threaded connection with the central shaft of the spindle box. The flange body and the central shaft of the spindle box are relatively fixed by bolting. Alternatively, the flange body has a through hole at its center for fitting onto the central shaft. After the through hole of the flange body is fitted onto the central shaft of the spindle box, it is fixed by welding. Alternatively, the flange body and the central shaft of the spindle box are integrally formed.

[0015] Preferably, the angle between the two elongated groove holes in the third group is 180 degrees in the circumferential direction; the flange body is a circular disc.

[0016] Preferably, the elongated countersunk hole is elongated or capsule-shaped, and the outer end of the elongated countersunk hole does not extend to the outer peripheral surface of the flange body; or the outer end of the elongated countersunk hole extends to the outer peripheral surface of the flange body so that a first bolt can be inserted into the elongated countersunk hole from the outer peripheral surface of the flange body. The first bolt can move along its length in the elongated countersunk hole but cannot rotate. The axial direction of the first bolt is the same as the axial direction of the flange body, and the first bolt can be pre-tightened and positioned in the elongated countersunk hole. The portion of the first bolt extending beyond the flange body mates with the flange hole of the hub.

[0017] Preferably, the pre-tightening positioning of the first bolt and the elongated countersunk hole is achieved by transitional engagement between the head end or screw section of the first bolt and the elongated countersunk hole; or a damping element is provided between the positions of the first bolt and the elongated countersunk hole to prevent relative movement between them.

[0018] Preferably, the cross-section of the elongated slotted hole is T-shaped, the cross-section of the first bolt is T-shaped, the head of the first bolt slides along its length within the elongated slotted hole, the threaded portion of the first bolt extends out of the flange body and locks into the flange hole on different types of hubs, the head of the first bolt is provided with a spring pressing against the T-shaped elongated slotted hole, the spring pressing allows the first bolt to be stopped at any position within the T-shaped elongated slotted hole; the spring is located in a recessed hole in the head of the first bolt, the opening of the recessed hole is provided with a steel ball that can rotate but cannot disengage from the recessed hole, the two ends of the spring press against the bottom of the recessed hole and between the steel ball, the steel ball is pressed against the inner wall of the elongated slotted hole under the action of the spring, so that the first bolt can be stopped at any position within the T-shaped elongated slotted hole; at least one circle is machined on the surface of the flange.

[0019] The working principle of this utility model of a special lathe for wheel hub machining is as follows: Because the lathe bed has a through groove or countersunk groove located in front of the headstock, the centerline of the headstock and the height of the tool post (mounted on the tool post support plate) can be lowered. This increases the rigidity of the bed, reduces instability during wheel hub machining, and reduces material usage and manufacturing costs. Since the first ends of the two guide rails extend to or near the rear end of the headstock, the tool post support plate can move the mounted tool post and cutting tool to the wall surface of the wheel hub near the headstock, enabling machining of this side of the wheel hub and ensuring the completeness and comprehensiveness of the machining process. Attached image description:

[0021] Figure 1 This is a top view of the structure of the device of this utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of the device of this utility model;

[0023] Figure 3 This is a cross-sectional structural diagram of the flange, central shaft, and hub assembly of the equipment in Embodiment 2 of this utility model;

[0024] Figure 4 This is a schematic diagram of the main structural view of the flange of the device in Embodiment 2;

[0025] Figure 5 yes Figure 4 A schematic diagram of the AA cross-section structure;

[0026] Figure 6 yes Figure 4 A schematic diagram of the K-direction structure;

[0027] Figure 7 This is a schematic diagram of the cross-sectional structure of the first bolt assembled with the elongated countersunk hole;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the first bolt;

[0029] Figure 9-12 This is a schematic diagram of the layout structure of various embodiments of the elongated countersunk hole in Example 2;

[0030] Figure 13 yes Figure 7 Another embodiment's structural diagram;

[0031] Figure 14 yes Figure 4 A schematic diagram of another embodiment.

[0032] Figure 15 This is a schematic diagram of the main structure of Embodiment 1 of this utility model;

[0033] Figure 16 yes Figure 15 A schematic diagram of the cross-sectional structure;

[0034] Figure 17 yes Figure 15 Rear view structural diagram (front);

[0035] Figure 18-21 This is a schematic diagram of the layout structure of another embodiment of the racetrack-shaped sinkhole of this utility model;

[0036] Figure 22 This is a cross-sectional structural diagram of the present invention assembled with a central shaft and a wheel hub;

[0037] Figure 23 yes Figure 22 A schematic diagram of another embodiment. Detailed implementation method:

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application; unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0041] The present invention relates to a special lathe for machining wheel hubs, comprising a lathe bed A0 for turning wheel hubs, a headstock A01 mounted on the lathe bed, and at least two guide rails A02 mounted on the lathe bed and located on one side of the headstock for supporting the tool post support plate.

[0042] In order to reduce instability during processing and reduce the manufacturing cost of the equipment, the height of the spindle box (i.e., the height of the spindle box center shaft center box), the height of the tool post and the cutting tool on the tool post are reduced. In order to avoid interference with the rotation of the hub, a through groove or countersunk groove A03 is provided on the lathe bed A0 in front of the spindle box.

[0043] The first end of the two guide rails A02 (i.e. Figure 1 The left end of the spindle box extends to or near the rear end of the spindle box (i.e., the left end of the spindle box). Figure 1 (at the left end of the middle), so that the cutting tool mounted on the tool holder plate A04 (and the tool holder) can machine the wall surface of the hub near the spindle box.

[0044] The spindle box and the two guide rails can be fixed separately (by bolts, welding or integral casting) to the lathe bed, or the spindle box and the two guide rails can be fixed as one piece, that is, the spindle box and the two guide rails can be integrally cast.

[0045] Alternatively, the spindle box A01 and two guide rails A02 are fixed (by bolts, welding, or integral casting) on ​​a single panel, and the panel is bolted or welded to the lathe bed. A through groove or countersunk groove is provided on the panel.

[0046] Guide rails can also be provided on the other side of the lathe bed opposite to the two guide rails.

[0047] This utility model relates to a special lathe for wheel hub processing. A flange body 1 is provided on the central shaft A1 of the headstock A01. The lathe bed A0 has space for fitting the wheel hub A4 into the central shaft A1 and fixing it in place. The central shaft A1 is horizontally suspended on the lathe bed A0. There is a large space between the central shaft A1 and the lathe bed platform (and a through groove or countersunk groove A03), so that after the wheel hub A4 is fitted into the central shaft A1 and fixed in place, the wheel hub A4 can rotate on its own axis or rotate with the central shaft. The flange body is provided with multiple elongated countersunk holes 4 for accommodating flange holes of different wheel hub models. The length direction of each elongated countersunk hole is arranged radially along the flange body, and the extension line of the symmetrical center line of each elongated countersunk hole can pass through the center of the flange body.

[0048] One embodiment (Embodiment 1) shows that the elongated countersunk hole 4, when viewed from the main viewing direction, is elongated or capsule-shaped, and the outer end of the elongated countersunk hole does not extend to the outer peripheral surface of the flange body (e.g., Figure 15-23As shown), in this embodiment, the elongated countersunk hole 4 is through in the thickness direction of the flange body, so that the first bolt A6 can pass through the elongated countersunk hole 4. When the first bolt A6 is locked with the nut, the head of the first bolt A6 is confined in the elongated countersunk hole 4, so that the first bolt A6 cannot rotate and slip (the fact that the first bolt A6 cannot rotate in the elongated countersunk hole can prevent slippage when the first bolt is connected with the nut, making it easier to lock).

[0049] Another embodiment (Embodiment 2) is that the outer ends of each of the above-mentioned elongated countersunk holes 4 extend to the outer peripheral surface 101 of the flange body. By extending the outer ends of each elongated countersunk hole to the outer peripheral surface 101 of the flange body, the first bolt A6 can be inserted from the outer peripheral surface of the flange body into the elongated countersunk hole. The first bolt A6 can move along the length direction of the elongated countersunk hole. The first bolt A6 cannot rotate in the elongated countersunk hole (the fact that the first bolt A6 cannot rotate in the elongated countersunk hole can prevent slippage when the first bolt is connected to the nut, making it easy to lock). The axial direction of the first bolt is the same as the axial direction of the flange body, and the first bolt can be pre-tightened and positioned in the elongated countersunk hole 4. The pre-tightening and positioning means that the first bolt can be relatively fixed (not absolutely fixed, but relatively fixed) at any position along the length direction of the elongated countersunk hole. The part of the first bolt that extends out of the flange body is engaged with the flange hole of the hub (that is, the first bolt A6 passes through the elongated countersunk hole 4 and through the flange hole of the hub, and is locked and fixed with a nut).

[0050] In the mechanical field, there are many ways to achieve pre-tightening positioning of the first bolt and the elongated countersunk hole. For example, the head end or screw section of the first bolt can be transitionally fitted with the elongated countersunk hole. When the two are transitionally fitted (i.e., the two are machined to a small clearance fit, there is friction between them when they move relative to each other), the first bolt will not move arbitrarily through the transitional fit, and a certain friction force needs to be overcome before it can move. Alternatively, a damping element can be provided between the positions of the first bolt and the elongated countersunk hole to prevent them from moving relative to each other. This damping element can be a rubber sheet, metal sheet, or spring, etc., to increase the friction between them.

[0051] The position of the first bolt relative to the elongated countersunk hole can be the head or the shank of the first bolt, that is, the damping element can be installed on the head or the shank of the first bolt, or the damping element can be installed on the wall of the elongated countersunk hole.

[0052] The following is a preferred embodiment of the present application for pre-tightening and positioning of the first bolt and the elongated slotted hole. The cross-section of the elongated slotted hole 4 is T-shaped, and the cross-section of the first bolt A6 is also T-shaped. The head of the first bolt A6 slides along its length within the elongated slotted hole 4. The threaded portion of the first bolt extends out of the flange body and is locked to the flange hole on different models of wheel hubs. The head of the first bolt is provided with a spring A7 that presses against the T-shaped elongated slotted hole. The pressing of the spring allows the first bolt to be positioned at any position within the T-shaped elongated slotted hole.

[0053] Preferably, the spring is disposed in the recessed hole A8 of the head of the first bolt. The opening of the recessed hole is provided with a steel ball A9 that can rotate but cannot detach from the recessed hole. The diameter of the opening of the recessed hole is smaller than the diameter of the steel ball A9, so that the steel ball A9 is only partially exposed and cannot detach from the recessed hole. The two ends of the spring press against the bottom of the recessed hole and the steel ball. Under the action of the spring, the steel ball presses against the inner wall of the elongated slotted hole, so that the first bolt can be stopped at any position in the T-shaped elongated slotted hole.

[0054] To prevent the steel ball A9 from coming out of the concave opening, a ring several millimeters high and several millimeters thick is machined at the concave opening. When the steel ball A9 and spring A7 are pressed into the concave opening A8, the ring is flattened. This will seal the steel ball A9 and spring A7 inside the concave opening, with only a part of the steel ball A9 exposed.

[0055] In use, first insert the first bolt A6 into the T-shaped elongated slot 4 and adjust it to the appropriate position. At this time, due to the support of the spring or the spring-push steel ball, the first bolt A6 can overcome its own weight and stop at any position in the T-shaped elongated slot 4. Thus, when the flange body is rotated as needed, the first bolt A6 will not fall out of the T-shaped elongated slot 4. Therefore, when installing the hub and the flange body, only one person is needed to operate, without one person adjusting and controlling the position of the T-shaped bolt A6 or another person carrying the hub, which facilitates the installation.

[0056] The elongated countersink hole in this embodiment has an elongated shape in the main view, and its cross-section is a T-shaped hole. The T-shaped hole has two embodiments, one of which is as follows: Figure 7 As shown, another type is as follows Figure 13 As shown, the preferred method is Figure 5 As shown, both embodiments can adopt the following layout of elongated countersunk holes, as well as the connection structure with the flange and the central shaft.

[0057] To facilitate the operator's reference to the position of the first bolt along the length of the elongated countersunk hole, at least one circle 5 is machined on the flange surface (e.g., ...). Figure 14As shown in the diagram, circle 5 is concentric with the center of the flange. Before mounting the hub onto the flange, bring the hub close to the flange to observe whether the flange holes of the hub are inside or outside circle 5. This allows you to move the first bolt to the approximate position, ensuring that each flange hole and each first bolt can be aligned at once when the hub is mounted onto the flange, thus achieving convenient and quick installation.

[0058] The method of using the flange in Embodiment 2 of this utility model involves placing the flange body onto the central shaft of the repair or polishing equipment, using bolts to pass through the countersunk holes and connect and lock them to the bolt holes on the central shaft to fix the flange body to the central shaft. Next, the hub to be repaired is placed onto the central shaft (a T-shaped first bolt is placed in the elongated countersunk hole of the hub beforehand). A tapered sleeve A10 is threaded onto the central shaft, and the outer circumferential surface of the tapered sleeve abuts against the central hole of the hub (since the diameter of the central hole of different hubs is slightly different, the shaft diameter of the central shaft is smaller than the central hole of the hub, and the function of the tapered sleeve A10 is equivalent to supporting the hub so that its central hole is coaxial with the central shaft). At this time, the tapered sleeve is not pressed tightly against the hub, allowing the hub to still rotate. Rotating the hub aligns the flange holes on the hub with the T-shaped first bolts on the elongated countersunk holes, and using nuts to lock the first bolts to fix the hub to the flange.

[0059] The elongated countersunk hole layouts of the above embodiments are all applicable to the following structures.

[0060] The flange hole A5 of the aforementioned wheel hub can be a through hole or a threaded hole. Currently, most wheel hubs on the market have the following three types of A4: wheel hubs with 4 circumferentially distributed flange holes (referred to as 4-hole wheel hubs, with an angle of 90 degrees between adjacent flange holes A5), wheel hubs with 5 circumferentially distributed flange holes (referred to as 5-hole wheel hubs, with an angle of 72 degrees between adjacent flange holes A5), and wheel hubs with 6 circumferentially distributed flange holes (referred to as 6-hole wheel hubs, with an angle of 60 degrees between adjacent flange holes A5). To fit a 4-hole wheel hub, 2, 3, or 4 holes can be selected for locking. To fit a 5-hole wheel hub, 3 holes can be selected for locking. To fit a 6-hole wheel hub, 3 holes can be selected for locking (usually these 3 holes are circumferentially distributed, i.e., the angle between two adjacent holes is 120 degrees).

[0061] This application discloses three sets of elongated countersunk holes. The first set has three circumferentially distributed elongated countersunk holes (i.e., the included angle between any two of the three elongated countersunk holes in the first set is 120 degrees). These three elongated countersunk holes in the first set are used to fit a wheel hub with six circumferentially distributed flange holes (i.e., a 4-hole wheel hub). The second set has three elongated countersunk holes, which are used to fit a wheel hub with five circumferentially distributed flange holes (i.e., a 5-hole wheel hub, with an included angle of 72 degrees between adjacent flange holes A5). For stable and reliable installation, the included angles between any two adjacent elongated countersunk holes in the second set are 72 degrees and 144 degrees, respectively. 144 degrees; wherein the third group has at least two elongated countersunk holes, the two elongated countersunk holes of the third group are used to adapt to a hub with four circumferentially distributed flange holes (i.e., a 4-hole hub, with an included angle of 90 degrees between adjacent flange holes A5). For stable installation and to select the minimum number of elongated countersunk holes, the two elongated countersunk holes of the third group are one elongated countersunk hole from each of the first and second groups (i.e., the two elongated countersunk holes of the third group are shared with one elongated countersunk hole from each of the first and second groups). In a preferred embodiment, the included angle between the two elongated countersunk holes of the third group in the circumferential direction is 180 degrees, and the elongated countersunk holes on the flange body do not interfere with each other.

[0062] Specifically, the flange body is provided with a first elongated countersunk hole K1, a second elongated countersunk hole K2, a third elongated countersunk hole K3, a fourth elongated countersunk hole K4, a fifth elongated countersunk hole K5, and a sixth elongated countersunk hole K6 in sequence. The included angles between two adjacent elongated countersunk holes in the circumferential direction of the flange body are 84 degrees, 36 degrees, 36 degrees, 84 degrees, 60 degrees, and 60 degrees, respectively. The first, third, and fifth elongated countersunk holes form the first group, the second, fourth, and sixth elongated countersunk holes form the second group, and the third and sixth elongated countersunk holes form the third group (e.g., ...). Figure 9 (As shown).

[0063] To ensure a more stable and reliable installation of the 4-hole hub, the third group can be equipped with three elongated countersunk holes. Specifically, a seventh elongated countersunk hole K7 can be provided between the first elongated countersunk hole K1 and the second elongated countersunk hole K2, or a seventh elongated countersunk hole K7 can be provided between the fourth elongated countersunk hole K4 and the fifth elongated countersunk hole K5. The angle between the seventh elongated countersunk hole K7 and the third elongated countersunk hole K3 along the circumferential direction of the flange body is 90 degrees (e.g., ...). Figure 10 , 11 (As shown).

[0064] To ensure a more stable and reliable installation of the 4-hole hub, the third group can be equipped with four elongated countersunk holes. Specifically, a seventh elongated countersunk hole K7 is provided between the first elongated countersunk hole K1 and the second elongated countersunk hole K2, and an eighth elongated countersunk hole K8 is provided between the fourth elongated countersunk hole K4 and the fifth elongated countersunk hole K5. The angles between the seventh elongated countersunk hole K7 and the eighth elongated countersunk hole K8 and the third elongated countersunk hole K3 in the circumferential direction of the flange body are 90 degrees (e.g., ...). Figure 12 (As shown).

[0065] The above lists the elongated groove holes of flange body 1 with different layouts designed to adapt to different wheel hubs. The following describes the installation structure of flange body 1 in detail.

[0066] One embodiment (preferred embodiment, such as...) Figure 4-8 As shown), the flange body 1 is provided with a through hole 2 for fitting onto the central shaft A1. The flange body is a round or square metal disc, preferably a round disc. The through hole 2 is located at the center of the flange body 1. The central shaft A1 can be a shaft installed on a hub dressing equipment, polishing equipment, or grinding equipment, etc. The central shaft A1 can be rotated or fixed as needed.

[0067] The flange body 1 has several countersunk holes 3 near the through hole and in the circumferential direction for bolts A2 to pass through. Bolts A2 are used to screw into bolt holes A3 on the central shaft to achieve relative fixation between the flange body 1 and the central shaft.

[0068] On the flange body 1, the aforementioned through hole 2 and countersunk hole 3 are not necessary. The through hole 2 is fitted onto the central shaft, and the flange body 1 and the central shaft are relatively fixed by bolts A2 passing through the countersunk hole 3. This is one embodiment of fixing the flange body 1 and the central shaft. Mechanically, there are many other ways to achieve this. For example, the center of the flange body has a through hole for fitting onto the central shaft, and after the through hole of the flange body is fitted onto the central shaft of the spindle box, the two are fixed by welding. Another example is that the center of the flange body has a threaded hole for threaded connection with the central shaft of the spindle box, and the flange body and the central shaft of the spindle box are relatively fixed by screw connection. Yet another example is that the flange body and the central shaft of the spindle box are integrally machined.

[0069] In the above embodiments, the central shaft A1 is a shaft that can be installed on dressing equipment, polishing equipment, grinding equipment, etc. The shaft can be a stepped shaft, and the bolt hole A3 is provided on the stepped end face of the stepped shaft (perpendicular to the axis of the central shaft A1), or an intermediate flange is provided on the central shaft to be fixedly connected to the flange body 1. One side of the flange body 1 abuts against the stepped end face, and the flange body 1 is fixed to the central shaft by bolt A2 passing through the countersunk hole 3 and screwing it into the bolt hole A3.

[0070] Because the flange body is equipped with elongated countersunk holes that can accommodate flange holes of different models of wheel hubs, there are three sets of elongated countersunk holes. The first set of three elongated countersunk holes can accommodate wheel hubs with six circumferentially distributed flange holes, the second set of three elongated countersunk holes can accommodate wheel hubs with five circumferentially distributed flange holes, and the third set of two elongated countersunk holes can accommodate wheel hubs with four circumferentially distributed flange holes. Thus, the flange body can be adapted to most wheel hubs on the market, reducing the cost of equipping equipment with different flanges.

[0071] Since the special lathe for wheel hub processing in this application can be adapted to most wheel hubs on the market, it is not necessary to make different flanges according to different wheel hubs, thus reducing the manufacturing cost of flanges.

[0072] In Embodiment 2, since the elongated countersunk hole extends to the outer circumference of the flange, the first bolt can be placed into the elongated countersunk hole during use. Since the first bolt can be pre-tightened and positioned at any position in the elongated countersunk hole, the first bolt can be adjusted to an appropriate position to correspond with the flange hole on the wheel hub to be processed. At this time, the first bolt is fitted into each flange hole on the wheel hub and locked with a nut. In this embodiment, when installing the wheel hub and the flange body, only one person is needed to operate. There is no need for one person to adjust and control the position of the first bolt and another person to lift the wheel hub, which greatly facilitates the installation and saves manpower.

[0073] The specific embodiments described above further illustrate the inventive purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit the scope of protection of this utility model. In particular, it should be noted that any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model by those skilled in the art should be included within the scope of protection of this utility model.

Claims

1. A special lathe for hub machining, characterized in that: The lathe includes a lathe bed for turning wheel hubs, a headstock mounted on the lathe bed, and at least two guide rails mounted on the lathe bed and located on one side of the headstock for supporting a tool holder. The lathe bed has a through groove or countersunk groove in front of the headstock to avoid interfering with the rotation of the wheel hub and to reduce the height of the headstock and tool holder. The first ends of the two guide rails extend to or near the rear end of the headstock so that the cutting tool mounted on the tool holder can machine the wall surface of the wheel hub near the headstock.

2. The special purpose lathe for machining of wheel hubs according to claim 1, characterized in that: The spindle box and the two guide rails are respectively fixed to the lathe bed, or the spindle box and the two guide rails are fixed together as one unit.

3. The special purpose lathe for machining of wheel hubs according to claim 1, characterized in that: The spindle box and two guide rails are fixed on a panel, and the panel is bolted or welded to the lathe bed. The through groove or countersunk groove is provided on the panel.

4. The special lathe for wheel hub machining according to claim 1, 2 or 3, characterized in that: The lathe bed also has guide rails on the other side opposite to the two guide rails.

5. The special lathe for machining of wheel hubs according to claim 1, 2 or 3, characterized in that: A flange body is provided on the central shaft of the spindle box. The flange body has multiple elongated countersunk holes for fitting flange holes of different models of wheel hubs. The length direction of each elongated countersunk hole is arranged radially along the flange body. There are three sets of elongated countersunk holes. The first set has three circumferentially distributed elongated countersunk holes, which are used to fit wheel hubs with 6 circumferentially distributed flange holes. The second set has three elongated countersunk holes, which are used to fit wheel hubs with 5 circumferentially distributed flange holes. The third set has at least two elongated countersunk holes, which are used to fit wheel hubs with 4 circumferentially distributed flange holes. The two elongated countersunk holes in the third set are one elongated countersunk hole from the first set and one from the second set. The elongated countersunk holes on the flange body do not interfere with each other.

6. The special purpose lathe for machining of wheel hubs according to claim 5, characterized in that: The flange body has a through hole at its center for fitting onto the central shaft, and elongated countersunk holes are located around the through hole. The central shaft is a stepped shaft, and bolt holes are provided on the stepped end face of the stepped shaft. The flange body and the central shaft are fixed by connecting bolts to the bolt holes. Alternatively, the flange body has a threaded hole at its center for threaded connection with the central shaft of the spindle box, and the flange body and the central shaft of the spindle box are relatively fixed by screw connection. Alternatively, the flange body has a through hole at its center for fitting onto the central shaft, and the flange body is fixed by welding after fitting onto the central shaft of the spindle box through the through hole. Alternatively, the flange body and the central shaft of the spindle box are integrally machined.

7. The special purpose lathe for machining of wheel hubs according to claim 5, characterized in that: The two elongated countersunk holes in the third group have an included angle of 180 degrees in the circumferential direction; the flange body is a circular disc.

8. The special lathe for wheel hub machining according to claim 5, characterized in that: The elongated countersunk hole is elongated or capsule-shaped, and the outer end of the elongated countersunk hole does not extend to the outer circumferential surface of the flange body; or the outer end of the elongated countersunk hole extends to the outer circumferential surface of the flange body so that a first bolt can be inserted into the elongated countersunk hole from the outer circumferential surface of the flange body. The first bolt can move along its length in the elongated countersunk hole but cannot rotate. The axial direction of the first bolt is the same as the axial direction of the flange body and the first bolt can be pre-tightened and positioned in the elongated countersunk hole. The part of the first bolt that extends out of the flange body mates with the flange hole of the hub.

9. The special purpose lathe for machining of wheel hubs according to claim 8, characterized in that: The pre-tightening positioning of the first bolt and the elongated countersunk hole is achieved by transitioning the head end or screw section of the first bolt to the elongated countersunk hole; or a damping element is provided between the positions of the first bolt and the elongated countersunk hole to prevent relative movement between them.

10. The special purpose lathe for machining of wheel hubs according to claim 9, characterized in that: The cross-section of the elongated slotted hole is T-shaped, and the cross-section of the first bolt is also T-shaped. The head of the first bolt slides along its length within the elongated slotted hole. The threaded portion of the first bolt extends out of the flange body and locks into the flange hole on different types of hubs. The head of the first bolt is equipped with a spring that presses against the T-shaped elongated slotted hole. The pressure of the spring allows the first bolt to be positioned at any location within the T-shaped elongated slotted hole. The spring is located in a recessed hole in the head of the first bolt. The opening of the recessed hole has a rotatable but non-detachable steel ball. Both ends of the spring press against the bottom of the recessed hole and the steel ball. Under the action of the spring, the steel ball presses against the inner wall of the elongated slotted hole, allowing the first bolt to be positioned at any location within the T-shaped elongated slotted hole. At least one circle is machined on the surface of the flange.

Images