Clamp for milling surface of direction column blank

Abstract

The utility model relates to the technical field of motorcycle part machining and positioning tools, in particular to a steering column blank surface milling clamp which comprises a base, a mounting plate fixed on the base, a clamping mechanism fixed on the mounting plate and a jacking mechanism, the clamping mechanism comprises a positioning block and a sliding assembly which are oppositely arranged at the two ends of the mounting plate, adjusting assemblies are arranged on the positioning block and the sliding assembly, and each adjusting assembly comprises an adjusting block rotationally connected to the positioning block and the sliding assembly; the adjusting block comprises a straight arm section and a gear section which are integrally formed, the center of the gear section is rotationally connected with a pin shaft, the bottom end of the pin shaft is fixed to the positioning block and the sliding assembly, the top end of the pin shaft is in threaded connection with a swing arm, and the swing arm can press and fix the adjusting block. The gear sections of the two segments are meshed with each other, and the straight arm sections of the two segments form a V-shaped bayonet. The device can clamp and position blank workpieces of different sizes, is high in applicability and stable in clamping, and can ensure the machining precision of the workpieces.

Description

Technical Field

[0001] The technical field involved in the present utility model is specifically a milling surface fixture for the blank of the steering column. Background Art

[0002] The motorcycle steering column is a key component in the motorcycle steering system. The steering column includes a tube column and a lower coupling plate fixed below the tube column. The upper end of the tube column is connected to the handlebar, and the lower coupling plate is used to connect the front fork of the motorcycle. The lower end of the front fork is connected to the front wheel of the vehicle. When the rider turns the handlebar, the steering torque can be transmitted to the front wheel through the steering column, thereby controlling the steering of the front wheel of the motorcycle.

[0003] The lower coupling plate is a component of the motorcycle steering column. Its blank is made of alloy material. In order to control the part size, improve the surface quality of the part, and ensure the assembly performance between the lower coupling plate and the motorcycle front fork, it is usually necessary to perform milling surface processing on the blank of the lower coupling plate to remove excess materials such as uneven burrs and oxide skins on the surface of the lower coupling plate, thereby controlling the structural dimensions of the parts and ensuring that the assembly surface is smooth, and improving the assembly performance. A bearing is installed inside the lower coupling plate to reduce the friction between the steering column tube and the front fork and ensure the smoothness of steering.

[0004] During milling surface processing, a fixture is required to fix the lower coupling plate. For example, in the prior art "a milling fixture for the lower coupling plate" (publication number: CN203592310U), its technical solution is to set V-shaped blocks at both ends of the bottom plate, set a cushion block in the middle of the bottom plate, place the workpiece on the cushion block, and use an adjusting screw to control the V-shaped blocks to move closer to the middle to clamp and fix the workpiece. However, the prior art still has the following technical problems:

[0005] Since in actual production, there are many types of products, and the sizes of the clamped parts of each blank are different. The V-shaped opening angle of the V-shaped blocks in the existing fixture is fixed. Therefore, it can only clamp blanks with a specific diameter size. When clamping blanks of different sizes, the clamped surface of the blank cannot contact the best stress point of the V-shaped opening, resulting in uneven distribution of the clamping force and poor clamping and positioning effects. If the blank is of a larger size, it may not be clamped. The instability of the clamping will cause the blank to loosen when contacting the milling cutter, resulting in an out-of-tolerance milling depth or unqualified flatness of the milled surface, thereby causing the blank material to be scrapped. In summary, the current fixture has very poor versatility. If different fixtures are equipped for different models of products, not only the cost is high but also the stacking occupies a large area. Therefore, it is urgent to develop a milling surface fixture for the blank of the steering column that can be applicable to clamping different models of products. Summary of the Utility Model

[0006] The utility model provides a milling fixture for the blank of a steering column, which can solve the problems in the prior art that the fixture has poor versatility. When clamping blanks of different types, the clamped surface of the blank cannot contact the best stress point of the clamping port of the fixture, resulting in poor clamping and positioning effect of the blank, and causing the machining dimension of the blank to exceed the tolerance during the milling process, resulting in the scrapping of the blank.

[0007] The present application provides the following technical solutions: A milling fixture for the blank of a steering column includes a base, a mounting plate fixed on the base, a clamping mechanism fixed on the mounting plate, and a jacking mechanism fixed on the mounting plate and used to drive the clamping mechanism to clamp the workpiece; the base includes a bottom plate and a support block fixed on the bottom plate, and the mounting plate is fixed on the upper support block;

[0008] The clamping mechanism includes positioning blocks and sliding components oppositely arranged at both ends of the mounting plate. Adjusting components are provided on both the positioning blocks and the sliding components. The adjusting component includes an adjusting block rotatably connected to the positioning block and the sliding component. Each adjusting component includes two adjusting blocks;

[0009] The adjusting block includes an integrally formed straight arm section and a gear section. A pin shaft is rotatably connected to the center of the gear section. The bottom end of the pin shaft is fixed on the positioning block and the sliding component, and a swing arm is threadedly connected to the top end of the pin shaft. The swing arm can press and fix the adjusting block;

[0010] The gear sections of the two blocks mesh with each other, and the straight arm sections of the two adjusting blocks form a V-shaped clamping opening.

[0011] Advantages:

[0012] Stable clamping and strong applicability: The adjusting block includes two parts, a straight arm section and a gear section. The straight arm section is used to form a V-shaped clamping opening, and the gear sections mesh with each other, so that the straight arm sections of the two groups of adjusting blocks can move synchronously, ensuring that the opening angle of the V-shaped clamping opening can also be adjusted synchronously and evenly according to the size and shape of the workpiece blank. When blanks of different sizes are clamped, they can all contact the best stress point on the straight arm section, and the clamping force during clamping can act evenly on the workpiece blank. Therefore, when clamping blanks of different sizes, the clamping stability can be ensured; it not only has strong applicability, but also can ensure the dimensional accuracy during milling processing, avoiding the scrapping of the blank.

[0013] Further, the sliding component includes a support fixed on the mounting plate and a slider slidably connected to the support. The pin shaft of the adjusting component above the slider is fixed on the slider.

[0014] Advantages: The slider can slide on the support, thereby driving the adjusting component above the slider to slide synchronously, facilitating the adjusting block of the adjusting component to smoothly contact and clamp the blank.

[0015] Further, round holes are also provided on the slider and the positioning block, and positioning pins are arranged in the round holes. The positioning pins extend axially into the tooth grooves of the gear section and are inserted into the round holes.

[0016] Beneficial effects: The positioning pins extend from the tooth grooves of the gear section and are inserted into the round holes, which can clamp the gear section. After the blank is clamped, the position of the adjusting block is locked and limited, preventing the gear section from rotating under force when the milling cutter contacts the surface of the blank during the milling process, thereby improving the clamping stability of the blank.

[0017] Further, the tightening mechanism includes a positioning seat fixed on the mounting plate, a threaded sleeve fixed on the positioning seat, a threaded column passing through the threaded sleeve, and a handrail fixed at the end of the threaded column. The end of the threaded column away from the handrail is a T-shaped head, and a T-shaped groove is provided on the slider. The T-shaped head is located in the T-shaped groove, and the T-shaped head can rotate in the T-shaped groove.

[0018] Beneficial effects: By rotating the handrail to drive the threaded column to move forward or backward axially in the threaded sleeve, and the T-shaped head of the threaded column is located in the T-shaped groove of the slider, it can drive the slider to slide when rotating the handrail, thereby controlling the adjusting block on the slider to perform the clamping and loosening operations. Converting the rotational motion of the threaded column and the threaded sleeve into the linear motion of the slider not only simplifies the operation but also ensures the stability and accuracy of driving the slider to move.

[0019] Further, a plurality of mounting holes are also provided on the mounting plate, and support sleeves are arranged in the mounting holes.

[0020] Beneficial effects: The support sleeves can be used to support the workpiece blank, ensuring that the blank can be placed horizontally on the support sleeves, thereby facilitating the clamping mechanism to apply a clamping force horizontally to the blank and ensuring the clamping stability. Description of the Drawings

[0021] Figure 1 is the front view of the present utility model.

[0022] Figure 2 is the top view of the present utility model.

[0023] Figure 3 is Figure 2 the top view when the adjusting component in

[0024] Figure 4 is the front view when the workpiece blank is placed on the fixture.

[0025] Figure 5 is Figure 4 the top view of Specific Embodiments

[0026] The following is a further detailed description through specific embodiments:

[0027] The reference signs in the attached drawings of the description include: base plate 1, support block 2, mounting plate 3, positioning block 4, support sleeve 5, adjusting block 6, straight arm section 61, gear section 62, swing arm 7, pin shaft 8, slider 9, support 10, threaded post 11, threaded sleeve 12, positioning seat 13, armrest 14, positioning pin 15, blank 16.

[0028] Embodiment 1

[0029] As Figures 1 to 4 shown, the facing fixture for the rough direction column includes a base, a mounting plate 3 fixed on the base, a clamping mechanism fixed at both ends above the mounting plate 3, and a pressing mechanism located at one end of the mounting plate 3. The base includes a base plate 1 and a support block 2 fixed on the base plate 1. The mounting plate 3 is fixed above the upper support block 2. The base plate 1 can be screwed to the workbench of the milling equipment; the pressing mechanism is used to drive the clamping mechanism to clamp the workpiece.

[0030] As Figure 1 shown, the clamping mechanism includes positioning blocks 4 and sliding components oppositely arranged at both ends of the mounting plate 3, and an adjusting component located above the positioning blocks 4 and the sliding components. The positioning blocks 4 are screwed to the mounting plate 3. The sliding component includes a support 10 screwed to the mounting plate 3 and a slider 9 located above the support 10. A chute is provided on the support 10. A protrusion is provided below the slider 9. The protrusion can slide in the chute so that the slider 9 can slide relative to the support 10.

[0031] As Figures 1 to 3 shown, there are two sets of adjusting components, which are respectively located above the positioning blocks 4 and the sliders 9. The adjusting component includes an adjusting block 6 rotatably connected to the positioning blocks 4 and the sliders 9. Since the structures of the adjusting components are the same, the adjusting component above the slider 9 is used to illustrate the structure in this embodiment. As Figure 1 and 3 shown, each adjusting component includes two adjusting blocks 6; the adjusting block 6 includes an integrally formed straight arm section 61 and a gear section 62. The straight arm sections 61 of the two adjusting blocks 6 form a V-shaped clamping opening. A tooth portion is provided on the outer periphery of the gear section 62. A pin shaft 8 is rotatably connected to the center of the gear section 62. The bottom end of the pin shaft 8 is fixed on the Figure 1 positioning blocks 4 and the sliders 9 in Figure 3 shown. A swing arm 7 as shown in Figure 3 is threadedly connected to the top end of the pin shaft 8. The gear sections 62 of the two sets of adjusting blocks 6 are meshed with each other. Tightening the swing arm 7 can press and fix the adjusting block 6. Round holes are also provided on the sliders 9 and the positioning blocks 4. A positioning pin 15 is provided in the round holes. The positioning pin 15 can extend into the tooth grooves of the gear section 62 and fit into the round holes, thereby locking the gear section 62 and restricting the rotation of the gear section 62. A T-shaped groove is also provided at one end of the slider 9 away from the adjusting block 6.

[0032] As Figure 1and Figure 2 As shown in Figure 2 , the pressing mechanism includes a positioning seat 13 fixed to the mounting plate 3 by screws, a threaded sleeve 12 fixed to the positioning seat 13, a threaded post 11 passing through the threaded sleeve 12, and a handrail 14 fixed to the end of the threaded post 11. A horizontal through-hole is provided on the positioning seat 13, and the threaded sleeve 12 is in interference fit in the through-hole. One end of the threaded post 11 away from the handrail 14 is a T-shaped head, and the T-shaped head is located in the T-shaped groove on the slider 9 and can rotate in the T-shaped groove.

[0033] As Figure 1 shown in Figure 1 , the mounting plate 3 is also provided with a plurality of mounting holes, and support sleeves 5 are provided in the mounting holes. The support sleeves 5 are in clearance fit with the mounting holes. The number and opening positions of the mounting holes can be set in multiple according to the product, so that the support sleeves 5 can be placed into the corresponding mounting holes when switching products, and the fixture can be made universal.

[0034] The using method of this fixture is as follows:

[0035] As Figure 4 and Figure 5 shown in Figure 4 and Figure 5 , place the blank 16 on the support sleeve 5, make the end of the blank 16 close to the positioning block 4 contact the adjusting block 6 on the positioning block 4, adjust the V-shaped opening angle of the straight arm section 61 of the adjusting block 6 so that the straight arm section 61 can reach the most suitable force-bearing position on the upper side of the blank 16, and insert the positioning pin 15 into the round hole of the positioning block 4 along the tooth groove of the gear section 62 to lock the gear section 62, and then tighten the swing arm 7 on the adjusting block 6 here to press the adjusting block 6 tightly; adjust the V-shaped opening angle of the straight arm section 61 of the adjusting block 6 on the slider 9 in the same way, and then turn the handrail 14, the threaded post 11 drives the slider 9 to move towards the blank 16, so that the adjusting block 6 above the slider 9 approaches and clamps the blank 16, thus completing the positioning of the blank 16, and subsequent milling processing can be carried out.

[0036] The above are only the embodiments of the present invention. The present invention is not limited to the fields involved in this embodiment case, and common knowledge such as specific structures and characteristics known in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A fixture for milling a steering column blank, comprising a base, a mounting plate fixed on the base, a clamping mechanism fixed on the mounting plate, and a clamping mechanism fixed on the mounting plate and used to drive the clamping mechanism to clamp a workpiece; the base comprises a bottom plate and a support block fixed on the bottom plate, the mounting plate is fixed on an upper support block, and is characterized in that: The clamping mechanism comprises positioning blocks and sliding components relatively arranged at two ends of the mounting plate, the positioning blocks and the sliding components are both provided with adjustment components, the adjustment components comprise adjustment blocks rotatably connected to the positioning blocks and the sliding components, and each adjustment component comprises two adjustment blocks; The adjusting block comprises an integrally formed straight arm section and a gear section, the center of the gear section is rotatably connected with a pin shaft, the bottom end of the pin shaft is fixed on the positioning block and the sliding assembly, and the top end of the pin shaft is threadedly connected with a swing arm, and the swing arm can press and fix the adjusting block; The gear segments of the two blocks mesh with each other, and the straight arm segments of the two segment blocks form a V-shaped bayonet.

2. The fixture for milling the steering column blank according to claim 1 is characterized in that: The sliding assembly comprises a support fixed on the mounting plate and a sliding block slidably connected to the support, and a pin shaft of the adjusting assembly above the sliding block is fixed on the sliding block.

3. The fixture for milling the steering column blank according to claim 2 is characterized in that: The sliding block and the positioning block are also provided with circular holes, and positioning pins are arranged in the circular holes. The positioning pins extend into the tooth grooves of the gear segment along the axial direction and are inserted into the circular holes.

4. The fixture for milling the steering column blank according to claim 3 is characterized in that: The tightening mechanism includes a positioning seat fixed on the mounting plate, a threaded sleeve fixed on the positioning seat, a threaded column inserted in the threaded sleeve, and an armrest fixed at the end of the threaded column. The end of the threaded column away from the armrest is a T-shaped head. A T-shaped slot is provided on the slider. The T-shaped head is located in the T-shaped slot and can rotate in the T-shaped slot.

5. The fixture for milling the steering column blank according to claim 4 is characterized in that: The mounting plate is also provided with a plurality of mounting holes, and support sleeves are provided in the mounting holes.

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