A positioning device for a thread rolling blank

Abstract

This utility model discloses a positioning device for thread rolling blanks, relating to the field of thread rolling machine technology, and solves the problem of poor positioning effect of bolt blanks in existing thread rolling machines, which affects the accuracy of thread rolling. It includes a pressing mechanism for pressing the blank and an axial position adjustment mechanism for positioning the blank axially. Both the pressing mechanism and the axial position adjustment mechanism are mounted on a fixed base. The pressing mechanism includes a pressure plate that can move up and down, with a flat bottom. The axial adjustment mechanism includes a top rod that can extend and retract along the axial direction of the blank. The pressure plate and the top rod are located in the same vertical plane. In this utility model, the pressing mechanism and the axial position adjustment mechanism work together to press the bolt blank and position it axially, ensuring that the bolt blank does not shift relative to the axial direction during thread rolling, thus improving processing accuracy.

Description

Technical Field

[0001] This utility model relates to the field of thread rolling machine technology, and in particular to a positioning device for thread rolling blanks. Background Technology

[0002] Thread rolling machines are multi-functional cold extrusion forming machine tools. Within their rolling pressure range, they can perform thread rolling, straight knurling, and oblique knurling on workpieces in a cold state; roll spur gears, helical gears, and helical spline gears; straighten, reduce diameter, burnish, and perform various forming rolls. Cold thread rolling is an advanced non-cutting machining process that effectively improves the internal and surface quality of workpieces.

[0003] During thread rolling, the bolt blank is placed on a support structure, specifically with the shank of the bolt blank resting on the support structure. Because the head of the bolt blank is relatively thick, it is top-heavy, with its center of gravity close to the head. Once the shank of the bolt blank is placed on the support structure, it is prone to falling off and cannot remain stably stationary. Furthermore, the thread length on the bolt shank varies depending on the bolt specification. Therefore, the length of the bolt blank shank on the support structure must be considered during thread rolling to prevent displacement and improve the bolt rolling process. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems by designing a positioning device for thread rolling blanks, which solves the problem of poor positioning effect of bolt blanks in existing thread rolling machines, affecting the accuracy of thread rolling.

[0005] To achieve the above objectives, the technical solution of this utility model is a positioning device for a thread rolling blank, comprising a pressing mechanism for pressing the blank and an axial position adjustment mechanism for positioning the blank axially. Both the pressing mechanism and the axial position adjustment mechanism are mounted on a fixed base. The pressing mechanism includes a pressure plate that can move up and down, and the bottom of the pressure plate is a plane. The axial position adjustment mechanism includes a top rod that can extend and retract along the axial direction of the blank. The pressure plate and the top rod are located in the same vertical plane.

[0006] Preferably, the fixing seat is fixedly mounted on the mounting plate, and the mounting plate can be fixedly mounted on the body of the thread rolling machine by bolts.

[0007] Preferably, the mounting plate has multiple waist-shaped holes, which extend in a direction perpendicular to the axial direction of the blank, and each waist-shaped hole is provided with a bolt.

[0008] Preferably, the fixing seat has a relief hole in the middle, and the mounting plate is horizontally fixed in the relief hole.

[0009] Preferably, the pressing mechanism further includes a pressing cylinder and a pressing base. The pressing cylinder is vertically fixedly installed on the front side of the fixed base. The output end of the pressing cylinder is connected to the pressing base. A fixing plate is provided on one side of the pressing base. The fixing plate is slidably connected to a slide rail fixed on the front side of the fixed base via a slider. The pressing plate is detachably installed at the bottom of the pressing base.

[0010] Preferably, the bottom of the pressure seat is provided with an installation groove, the upper side of the pressure plate is engaged in the installation groove and fixed by bolts.

[0011] Preferably, the middle area at the bottom of the pressure plate has a downward protrusion forming a pressing part, and the thickness of the pressing part does not exceed the diameter of the blank.

[0012] Preferably, the axial position adjustment mechanism further includes an electric cylinder and a connecting seat. The electric cylinder is horizontally fixedly installed at the bottom of the fixed seat, the connecting seat is installed on the electric cylinder, and the push rod is horizontally installed on the connecting seat.

[0013] Preferably, the bottom of the connecting seat has a groove, in which a limiting block and a spring are disposed. The top rod passes through the groove and is inserted into the connecting seat. The limiting block is fixed on the top rod, and the spring is sleeved on the top rod, with both ends of the spring abutting against the limiting block and the inner wall of the groove, respectively.

[0014] Preferably, the limiting block is provided with a positioning rod, and the two side walls of the groove are provided with positioning holes that cooperate with the positioning rod.

[0015] Its advantages over existing technologies are:

[0016] In this invention, a push rod that can move axially along the bolt blank holds the rear end of the bolt blank in place, preventing axial movement. Simultaneously, the length of the bolt blank's shank on the support structure is adjusted to match the thread length. A pressure plate in the pressing mechanism moves downwards to press the bolt blank's shank firmly against the support structure, preventing it from falling off. The pressing mechanism and the axial position adjustment mechanism work together to press the bolt blank firmly and position it axially, ensuring that the bolt blank does not shift relative to its axial direction during thread rolling, thus improving machining accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the positioning device in this utility model;

[0018] Figure 2 This is a structural schematic diagram of the positioning device from another perspective;

[0019] Figure 3 This is a schematic diagram of the pressure seat in the positioning device;

[0020] Figure 4 This is a schematic diagram of the pressure plate in the positioning device;

[0021] Figure 5 This is a schematic diagram of the positioning device positioning the bolt blank.

[0022] In the diagram, 1. Pressing mechanism; 11. Pressing cylinder; 12. Pressing seat; 121. Mounting groove; 13. Pressing plate; 131. Pressing part; 14. Fixing plate; 2. Axial position adjustment mechanism; 21. Electric cylinder; 22. Connecting seat; 221. Positioning hole; 23. Push rod; 24. Limiting block; 25. Spring; 26. Positioning rod; 3. Fixing seat; 4. Mounting plate; 401. Wavy hole; 5. Bolt blank; 6. Support structure. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] like Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention provides a positioning device for a thread rolling blank. This positioning device is mainly used to press down and tighten the bolt blank 5 and position it axially.

[0025] Specifically, the positioning device mainly consists of two parts: a pressing mechanism 1 and an axial position adjustment mechanism 2. The pressing mechanism 1 is installed on the front side of the fixed base 3, and the axial position adjustment mechanism 2 is installed on the bottom of the fixed base 3. Both are installed on the same component, which ensures high stability and facilitates installation and disassembly.

[0026] like Figure 1 As shown, the pressing mechanism 1 mainly consists of a pressing cylinder 11, a pressing base 12, a pressing plate 13, and a fixing plate 14. The pressing base 12 is fixedly mounted on the fixing plate 14, which is then bolted to the slider. The slider is slidably connected to a slide rail fixed to the front side of the fixing base 3, allowing the pressing base 12 to move up and down. The pressing cylinder 11 is vertically fixedly mounted on the front side of the fixing base 3, and its output end is connected to the upper end of the pressing base 12 to drive the pressing base 12 to move up and down.

[0027] refer to Figures 1-3A mounting groove 121 is located at the bottom of the pressure base 12, in the middle area of ​​the bottom of the pressure base 12, and extends through the entire structure. The width of the mounting groove 121 is approximately the same as the thickness of the pressure plate 13. The upper end of the pressure plate 13 is inserted into the mounting groove 121 and fixed to the bottom of the pressure base 12 with bolts. Therefore, the pressure plate 13 can be replaced as needed, and disassembly is simple and convenient. The snap-fit ​​design prevents the pressure plate 13 from swaying left or right when pressed down.

[0028] refer to Figure 4 The bottom center area of ​​the lower plate has a downward protrusion forming a clamping part 131. The thickness of the clamping part 131 is less than the thickness of the pressure plate 13 body, and does not exceed the diameter of the bolt blank 5. This is to prevent the pressure plate 13 from interfering with the thread rolling wheels when the two thread rolling wheels are performing thread rolling on the bolt blank 5.

[0029] The bottom surface of the pressure plate 13 is flat. The bolt blank 5 is placed on the support structure 6. The pressing cylinder 11 controls the pressure plate 13 to move down, and the pressing part 131 at the bottom of the pressure plate 13 will press the bolt blank 5.

[0030] like Figure 2 As shown, the axial position adjustment mechanism 2 is mainly composed of an electric cylinder 21, a connecting seat 22, a push rod 23, a limit block 24, a spring 25, and a positioning rod 26. The electric cylinder 21 is horizontally fixedly installed at the bottom of the fixed seat 3, and the connecting seat 22 is installed on the electric cylinder 21 and its horizontal movement is controlled by the electric cylinder 21.

[0031] The bottom of the connecting seat 22 has a groove, making the shape of the connecting seat 22 n-shaped. The push rod 23 passes horizontally through the groove and is horizontally inserted into the connecting seat 22. The limiting block 24 and the spring 25 are both located in the groove, wherein the limiting block 24 is fixed on the push rod 23, and the spring 25 is sleeved on the push rod 23. The two ends of the spring 25 abut against the limiting block 24 and the inner wall of the groove, respectively, applying a preload force to the limiting block 24 in the direction of the bolt blank 5, so that the push rod 23 can always be in contact with the shank of the bolt blank 5.

[0032] The positioning rod 26 is inserted and fixed on the limiting block 24. Positioning holes 221, corresponding to the two ends of the positioning rod 26, are located on the inner walls of both sides of the groove. Driven by the electric cylinder 21, the push rod 23 presses against the bolt blank 5. When the push rod 23 contacts the bolt blank 5, it has a certain amount of backward movement. The push rod 23 moves backward relative to the connecting seat 22, causing the limiting block 24 to move. The positioning rod 26 on the limiting block 24 is then inserted into the corresponding positioning hole 221, serving a positioning function. At this time, the spring 25 is compressed, ensuring that the push rod 23 remains in contact with the end of the bolt blank 5, while also acting as a buffer to prevent damage to the bolt blank 5.

[0033] During the thread rolling process, the bolt blank 5 moves axially towards the direction of the push rod 23 under the drive of the thread rolling wheel. At this time, the push rod 23 will drive the limit block 24 to move to the right in the figure, and the spring 25 will be compressed until the bolt blank 5 completes the thread rolling process. After the processing is completed, the spring 25 returns to its original length, and the push rod 23 will return to its original position under the action of the spring 25, pushing the bolt to its original position, while waiting for the next workpiece.

[0034] You can refer to this. Figure 5 After the bolt blank 5 is placed on the support structure 6, the electric cylinder 21 controls the push rod 23 to approach the bolt blank 5 and press against the rear end of the bolt blank 5 (i.e. the end away from the head), and adjust the length of the shank of the bolt blank 5 on the support structure 6 (this length is the length to be threaded). At the same time, the pressure plate 13 moves down to press the bolt blank 5 tightly, which facilitates the subsequent threading process.

[0035] It should be noted that the pressure plate 13 and the push rod 23 are in the same vertical plane. When the push rod 23 presses against the end of the bolt blank 5, the pressure plate 13 will press the shank of the bolt blank 5 tightly, so that the position of the bolt blank 5 always remains horizontal and will not fall off the support structure 6, so as to facilitate subsequent thread rolling.

[0036] In this embodiment, the use of cylinders and electric cylinders as driving components is not limited to pneumatic cylinders and electric cylinders. Other driving components can also be used to provide power to control the movement of the pressure plate 13 and the push rod 23.

[0037] like Figure 1 As shown, the fixed base 3 has a rectangular notch, through which the mounting plate 4 passes horizontally and is fixed to the fixed base 3 with bolts. The positioning device is fixedly mounted on the body of the thread rolling machine via the mounting plate 4.

[0038] To facilitate adjustment of the horizontal position of the positioning device, multiple oblong holes 401 are provided on the mounting plate 4. The oblong holes 401 extend along the axial direction perpendicular to the bolt blank 5. The bolt passes through the oblong holes 401 and is threaded into the body of the thread rolling machine, thereby fixing the positioning device. The horizontal position of the positioning device can be adjusted through these oblong holes 401, allowing for flexible adjustment.

[0039] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A positioning device for a thread rolling blank, characterized in that It includes a pressing mechanism (1) for pressing the billet and an axial position adjustment mechanism (2) for positioning the billet axially. Both the pressing mechanism (1) and the axial position adjustment mechanism (2) are mounted on a fixed base (3). The pressing mechanism (1) includes a pressure plate (13) that can move up and down. The bottom of the pressure plate (13) is a plane. The axial position adjustment mechanism includes a top rod (23) that can move telescopically along the axial direction of the billet. The pressure plate (13) and the top rod (23) are located in the same vertical plane.

2. A positioning device for a thread rolling blank according to claim 1, characterized in that The fixed seat (3) is fixedly installed on the mounting plate (4), and the mounting plate (4) can be fixedly installed on the body of the thread rolling machine by bolts.

3. A positioning device for a thread rolling blank according to claim 2, characterized in that The mounting plate (4) has multiple waist-shaped holes (401) that extend in a direction perpendicular to the axial direction of the blank, and each waist-shaped hole (401) is provided with a bolt.

4. The positioning device for a thread rolling blank according to claim 2, characterized in that, The fixing seat (3) has a relief hole in the middle, and the mounting plate (4) is horizontally fixed in the relief hole.

5. A positioning device for a thread rolling blank as defined in claim 1, characterized in that The pressing mechanism (1) further includes a pressing cylinder (11) and a pressing base (12). The pressing cylinder (11) is vertically fixedly installed on the front side of the fixed base (3). The output end of the pressing cylinder (11) is connected to the pressing base (12). A fixing plate (14) is provided on one side of the pressing base (12). The fixing plate (14) is slidably connected to the slide rail fixed on the front side of the fixed base (3) by a slider. The pressing plate (13) is detachably installed on the bottom of the pressing base (12).

6. A positioning device for a thread rolling blank according to claim 5, characterized in that The bottom of the pressure base (12) is provided with an installation groove (121), and the upper side of the pressure plate (13) is engaged in the installation groove (121) and fixed by bolts.

7. A positioning device for a thread rolling blank according to claim 6, characterized in that The middle area at the bottom of the pressure plate (13) protrudes downward to form a pressing part (131), the thickness of which does not exceed the diameter of the blank.

8. A positioning device for a thread rolling blank as defined in claim 1, characterized in that The axial position adjustment mechanism (2) further includes an electric cylinder (21) and a connecting seat (22). The electric cylinder (21) is horizontally fixedly installed at the bottom of the fixed seat (3). The connecting seat (22) is installed on the electric cylinder (21). The push rod (23) is horizontally installed on the connecting seat (22).

9. A positioning device for a thread rolling blank according to claim 8, characterized in that The bottom of the connecting seat (22) has a groove, in which a limiting block (24) and a spring (25) are provided. The top rod (23) passes through the groove and is inserted into the connecting seat (22). The limiting block (24) is fixed on the top rod (23). The spring (25) is sleeved on the top rod (23), and the two ends of the spring (25) abut against the limiting block (24) and the inner wall of the groove, respectively.

10. A positioning device for a thread rolling blank according to claim 9, characterized in that The limiting block (24) is provided with a positioning rod (26), and the two side walls of the groove are provided with positioning holes (221) that cooperate with the positioning rod (26).

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