A fixing device for abutting double-end bolts for machine tools

Abstract

This application discloses a fixing device for a double-ended stud bolt used in machine tools, relating to the technical field of machine tool fixtures. It includes a machine tool body, a chuck rotatably mounted on the machine tool body, an abutment member, and a tailstock slidably mounted on the machine tool body. The chuck is perpendicular to the sliding direction of the tailstock. The abutment member is rotatably mounted on the tailstock, with an abutment hole at one end away from the mounting rod, the center of which is at the same height as the center of the chuck. The chuck clamps one end of the double-ended stud bolt, and then the tailstock slides, causing the abutment member on the tailstock to abut against the other end of the double-ended stud bolt. One end of the double-ended stud bolt is held by the chuck, while the other end directly abuts against the abutment hole. This eliminates the need for pre-drilling and cutting off the drilled portion, simplifying the processing flow and improving production efficiency. Furthermore, it eliminates the need to reserve space for cutting off the drilled portion, saving production costs.

Description

Technical Field

[0001] This application relates to the technical field of machine tool fixtures, and in particular to a fixing device for abutting double-ended bolts for machine tools. Background Technology

[0002] With the continuous development of the machinery manufacturing industry, the requirements for the machining accuracy and efficiency of various mechanical parts are increasing. Machine tools, as important equipment for machining mechanical parts, rely heavily on their fixtures. When machining parts with special structural and functional requirements, appropriate fixture design is particularly crucial. For example, double-ended bolts, widely used in mechanical connections, have a significant impact on the overall performance of the machine due to the ease of installation and disassembly, as well as their machining accuracy.

[0003] In related technologies, when machining the middle section of a double-ended stud, a common fixing method is to first drill a hole at one end of the stud using a centering drill, then use a chuck on the machine tool to clamp and fix the other end of the stud, and finally insert a centering tip into the drilled hole, with the tip abutting against the stud and the tip engaging with the chuck to clamp the stud. This method is based on the principles of centering and clamping. The chuck provides a stable circumferential clamping force, while the centering tip plays a role in axial positioning and auxiliary fixing, which can ensure the stability of the stud during machining to a certain extent.

[0004] Regarding the aforementioned related technologies, since workpiece production requirements stipulate that drilling is not allowed in stud bolts, the portion with the drilled hole needs to be cut off after the middle part of the stud bolt is machined. This not only increases the number of operation steps and makes the processing more cumbersome, but also requires leaving sufficient allowance for drilling before machining the workpiece to avoid the workpiece not meeting production requirements after the drilled portion is removed, thus increasing production costs. Therefore, this application proposes a fixing device for abutting stud bolts on a machine tool. Utility Model Content

[0005] This application provides a fixing device for abutting double-ended bolts for machine tools.

[0006] This application provides a fixing device for a machine tool with abutment double-ended bolts, which adopts the following technical solution:

[0007] A fixing device for a double-ended stud for a machine tool includes a machine tool body, a chuck rotatably mounted on the machine tool body, and a tailstock slidably mounted on the machine tool body. The chuck is perpendicular to the sliding direction of the tailstock. The device also includes an abutment member rotatably mounted on the tailstock. The abutment member has an abutment hole at one end away from the mounting rod for abutting against the workpiece. The center of the abutment hole is at the same height as the center of the chuck.

[0008] By adopting the above technical solution, one end of the double-ended bolt is clamped by the chuck, and then the tailstock slides so that the abutment on the tailstock abuts against the other end of the double-ended bolt. Since the center of the abutment hole and the center of the chuck are at the same height, it ensures that the double-ended bolt can be accurately inserted into the abutment hole, preventing misalignment between the double-ended bolt and the abutment hole from causing workpiece wear and improving machining accuracy. One end of the double-ended bolt is clamped by the chuck, and the other end directly abuts against the abutment hole, eliminating the need for pre-drilling or cutting off the drilled portion, simplifying the machining process and improving production efficiency. At the same time, there is no need to reserve the allowance for cutting off the drilled portion, saving production costs.

[0009] Preferably, the abutment hole is frustum-shaped, the axis of the abutment hole is perpendicular to the chuck and passes through the center of the chuck, and the diameter of the abutment hole at the end near the mounting rod is smaller than the diameter of the abutment hole at the end away from the mounting rod.

[0010] By adopting the above technical solution, the abutment hole is designed in the shape of a frustum, and the diameter of the hole near the end of the mounting rod is smaller. This structure can better adapt to double-ended bolts of different diameters, enhance versatility, and at the same time ensure abutment stability and reduce workpiece shaking during processing. In addition, the inner wall of the frustum-shaped abutment hole can contact the chamfer of the workpiece, increasing the contact area between the abutment part and the workpiece, and ensuring abutment stability.

[0011] Preferably, the abutment is a cylindrical rod, and the end of the abutment near the chuck is chamfered.

[0012] By adopting the above technical solution, when facing a workpiece with a large-diameter hole, the chamfering part can extend into the hole of the workpiece and abut against the workpiece, thus enhancing the flexibility of use.

[0013] Preferably, the abutting member extends from the chamfered surface to the periphery of the abutting hole, and the chamfer angle is 30°-40°.

[0014] By adopting the above technical solution, the chamfered surface of the abutment extends to the periphery of the abutment hole, giving the abutment a sufficient chamfered area. At the same time, the chamfer angle is set to 30°-40°, which also ensures that the abutment can smoothly enter the hole opened in the workpiece, while preventing unstable abutment or the abutment from entering the hole that is difficult to open in the workpiece due to excessive or insufficient angle.

[0015] Preferably, an mounting rod is provided between the abutment and the tailstock. The mounting rod is arranged along the sliding direction of the tailstock. One end of the mounting rod is detachably mounted on the side of the tailstock near the chuck, and the other end of the mounting rod is rotatably mounted on the end of the abutment away from the chuck.

[0016] By adopting the above technical solution, the abutment and the tailstock are connected by an installation rod. The installation rod is detachable, which facilitates maintenance and replacement of the abutment.

[0017] Preferably, the end of the abutment member away from the abutment hole has an installation hole, and the end of the mounting rod near the abutment member is fitted with a bearing. The end of the mounting rod near the abutment member is inserted into the installation hole and rotatably connected to the abutment member through the bearing.

[0018] By adopting the above technical solution, the abutment part is rotatably connected to the mounting rod through the bearing, which further reduces friction and ensures that the double-ended bolt rotates smoothly during processing, avoiding workpiece damage or decrease in processing accuracy caused by friction.

[0019] Preferably, the tailstock has a snap-fit ​​hole on the side near the mounting rod, and the end of the mounting rod away from the abutment rod is inserted into the snap-fit ​​hole and installed on the tailstock.

[0020] By adopting the above technical solution, the mounting rod is fixed to the tailstock through the snap-fit ​​hole. The structure is simple and stable, which facilitates quick installation and disassembly, and improves the flexibility and maintenance efficiency of the device.

[0021] Preferably, the chuck is a three-jaw chuck.

[0022] By adopting the above technical solution, the three-jaw chuck has automatic centering. When clamping a workpiece, the three jaws will move towards the center of the chuck at the same time, which can quickly and automatically center the workpiece. It has a good clamping effect on some round or near-round workpieces.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By rotating and installing the abutment part on the tailstock, the double-ended bolt extends into the abutment hole of the abutment part and abuts against the abutment part. The abutment part cooperates with the chuck to clamp the double-ended bolt. There is no need to pre-drill holes or cut off the drilled part, which simplifies the processing flow and improves production efficiency. At the same time, there is no need to reserve the allowance for cutting off the drilled part, which saves production costs.

[0025] 2. An installation rod is provided between the abutment and the tailstock. One end of the installation rod is rotatably connected to the abutment, and the other end of the installation rod is detachably installed on the tailstock so as to facilitate the replacement of the abutment when it is damaged.

[0026] 3. The end of the abutment near the chuck is chamfered. When facing a workpiece with a large-diameter hole, the abutment can extend into the hole and abut against the workpiece, enhancing its flexibility. The chamfer extends to the periphery of the abutment hole, giving the abutment sufficient slope area. The chamfer slope is 30°-40°, ensuring that the abutment can smoothly enter the hole of the workpiece, while preventing unstable abutment or the abutment from entering a hole that is difficult to access due to an angle that is too large or too small. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the mounting rod and the abutment in the embodiments of this application.

[0029] Reference numerals in the attached drawings: 1. Machine tool body; 2. Chuck; 3. Mounting rod; 4. Abutment part; 5. Tailstock; 6. Abutment hole; 7. Chamfer. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail.

[0031] This application discloses a fixing device for abutting double-ended bolts for machine tools.

[0032] refer to Figure 1 A fixing device for a double-ended stud for a machine tool includes a machine tool body 1, a chuck 2, a mounting rod 3, an abutment member 4, and a tailstock 5. The chuck 2 is rotatably mounted on the machine tool body 1 via a connecting hole at its center, engaging with a rotating shaft on the machine tool body 1. The tailstock 5 is slidably mounted on the machine tool body 1, with the chuck 2 perpendicular to the sliding direction of the tailstock 5. The mounting rod 3 is detachably mounted on the tailstock 5. The abutment member 4 is rotatably mounted on the end of the mounting rod 3 away from the tailstock 5. In this embodiment, a three-jaw chuck is used. A three-jaw chuck has self-centering; when clamping a workpiece, the three jaws move simultaneously towards the center of the chuck, enabling rapid and automatic centering, and providing good clamping effect for some circular or near-circular workpieces. In other embodiments, a four-jaw chuck can also be used. Each jaw of a four-jaw chuck can move independently, and by adjusting the position of the four jaws, various rectangular and irregular workpieces can be clamped, enhancing the flexibility of use.

[0033] refer to Figure 2 Specifically, the mounting rod 3 is a cylindrical rod, and the mounting rod 3 is set along the sliding direction of the tailstock 5; the tailstock 5 has a snap-fit ​​hole on the side near the chuck 2, one end of the mounting rod 3 is inserted into the snap-fit ​​hole and is fixed to the tailstock 5 by screws, so as to achieve the effect of detachable installation of the mounting rod 3, so as to facilitate maintenance and replacement of the abutment part 4.

[0034] refer to Figure 2The abutment 4 is also a cylindrical rod, coaxially arranged with the mounting rod 3. The abutment 4 has a mounting hole at the end near the mounting rod 3, and a bushing is fitted at the end of the mounting rod 3 near the abutment 4. The mounting rod 3 is inserted into the mounting hole and rotatably connected to the abutment 4 through the bushing. The abutment 4 has an abutment hole 6 at the end away from the mounting rod 3, which abuts against the workpiece. The abutment hole 6 is frustoconical, and its axis is perpendicular to the chuck 2 and passes through the center of the chuck 2. When one end of the double-ended bolt is clamped by the chuck 2, the other end extends into the abutment hole 6. The frustoconical structure of the abutment hole 6 can tightly fit the chamfer 7 of the bolt, stably clamping the double-ended bolt and preventing it from shaking during processing. At the same time, it ensures the accurate position of the bolt during processing and prevents the decrease in processing accuracy due to positional deviation.

[0035] refer to Figure 2 Specifically, the end of the abutment 4 near the chuck 2 is machined with a chamfer 7. The chamfer 7 extends from the inclined surface to the periphery of the abutment hole 6, and the angle of the chamfer 7 is 30°-40°. In this embodiment, the chamfer 7 is 30°. When facing a workpiece with a large-diameter hole, the chamfer 7 allows the abutment 4 to extend into the hole of the workpiece and abut against the workpiece, thereby achieving auxiliary fixation of these workpieces and enhancing the flexibility of use. While the abutment 4 has a sufficient inclined surface area, it also ensures that the abutment 4 can smoothly enter the hole of the workpiece, and at the same time prevents unstable abutment due to excessively large or small angles, or prevents the abutment 4 from entering the hole of the workpiece that is difficult to open.

[0036] The mounting rod 3, the abutment 4, and the tailstock 5 are assembled together. The mounting rod 3 is installed on the tailstock 5 and rotates with the abutment 4, allowing the abutment 4 to move as the tailstock 5 slides. During machining, it can rotate freely, better cooperating with the chuck 2 to secure the double-ended bolt. When the tailstock 5 slides on the machine body 1, the mounting rod 3 moves the abutment 4 together, adjusting it to a suitable position to secure the double-ended bolt with the chuck 2. When the chuck 2 rotates the bolt, the abutment 4 rotates relative to the mounting rod 3 via a bearing, ensuring stable fixing and smooth machining.

[0037] The implementation principle of this embodiment is as follows: one end of the double-ended bolt is clamped by the chuck 2, and then the tailstock 5 is slid. The abutment 4 approaches the double-ended bolt, and the other end of the double-ended bolt extends into the abutment hole 6 on the abutment 4 and abuts against the abutment 4. There is no need to pre-drill holes or cut off the drilled part, which simplifies the processing flow and improves production efficiency. At the same time, there is no need to reserve the allowance for cutting off the drilled part, which saves production costs.

[0038] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fixing device for a machine tool with a double-ended stud, comprising a machine tool body (1), a chuck (2) rotatably mounted on the machine tool body (1), and a tailstock (5) slidably mounted on the machine tool body (1), wherein the chuck (2) is perpendicular to the sliding direction of the tailstock (5), characterized in that, It also includes an abutment (4), which is rotatably mounted on the tailstock (5). An abutment hole (6) is provided at the end away from the mounting rod (3) to abut against the workpiece. The center of the abutment hole (6) is at the same height as the center of the chuck (2).

2. The fixing device for a machine tool with abutment double-ended bolt according to claim 1, characterized in that, The abutment hole (6) is configured as a frustum shape. The axis of the abutment hole (6) is perpendicular to the chuck (2) and passes through the center of the chuck (2). The diameter of the abutment hole (6) at the end near the mounting rod (3) is smaller than the diameter of the abutment hole (6) at the end away from the mounting rod (3).

3. The fixing device for a machine tool with abutment double-ended bolt according to claim 2, characterized in that, The abutment (4) is a cylindrical rod, and the end of the abutment (4) near the chuck (2) is chamfered (7).

4. A fixing device for a machine tool with abutting double-ended bolts according to claim 3, characterized in that, The abutting member (4) extends to the periphery of the abutting hole (6) by the chamfer (7), the chamfer (7) having an angle of 30°-40°.

5. A fixing device for a machine tool with abutment double-ended bolts according to claim 4, characterized in that, An installation rod (3) is provided between the abutment (4) and the tailstock (5). The installation rod (3) is arranged along the sliding direction of the tailstock (5). One end of the installation rod (3) is detachably installed on the side of the tailstock (5) near the chuck (2), and the other end of the installation rod (3) is rotatably installed on the end of the abutment (4) away from the chuck (2).

6. A fixing device for a machine tool with abutment double-ended bolts according to claim 5, characterized in that, The abutment (4) has an installation hole at one end away from the abutment hole (6), and the mounting rod (3) has a bearing sleeve at one end near the abutment (4). The mounting rod (3) is inserted into the installation hole and rotatedly connected to the abutment (4) through the bearing.

7. A fixing device for a machine tool with abutment double-ended bolts according to claim 5, characterized in that, The tailstock (5) has a snap-fit ​​hole on the side near the mounting rod (3), and the end of the mounting rod (3) away from the abutment rod is inserted into the snap-fit ​​hole and installed on the tailstock (5).

8. A fixing device for a machine tool with abutment double-ended bolt according to claim 1, characterized in that, The chuck (2) is a three-jaw chuck.

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