A connecting beam drilling fixture

Abstract

A connecting beam drilling fixture belongs to the field of mechanical design and manufacturing. It includes a tire frame, a middle support body and an end support body. The middle support body includes a middle fixed bevel, a middle movable bevel and a transverse wedge; the end support body includes an end fixed bevel, an end movable bevel, an upper release bevel and a lower release bevel. The beneficial effect of the present invention is that the drilling fixture can adapt to different connecting beam inner side distance sizes by utilizing the different thicknesses formed by paired inclined surfaces, has wide adaptability, and is simple and convenient to operate. The bevel has a self-locking effect, which can prevent the formed inner support from loosening during drilling, reliably supports the two arms of the connecting beam, and prevents the hole axis from tilting due to drilling force. The two holes drilled have a high coaxiality, which meets the drilling requirements.

Description

Technical field:

[0001] The invention discloses a connecting beam drilling fixture, belonging to the field of mechanical design and manufacturing, in particular to a U-shaped part drilling processing fixture. Background technology:

[0002] The connecting beam is a key component of a road-rail vehicle (such as Figure 1 As shown in the figure, 8 holes need to be drilled on the two arms of the U-shaped connecting beam respectively, and the corresponding two holes on the two arms have higher coaxiality requirements. The existing technology uses drilling holes on the two arms respectively, and then the two arms are connected with a mandrel and then welded. During the trial production, it was found that due to welding deformation, the mandrel is not easy to remove after welding. Even if the mandrel is removed, the deformation after the welding stress release will cause the coaxiality of the two holes to be out of tolerance. For this reason, it was decided to adopt the post-weld drilling process, that is, the welded connecting beam is placed vertically and drilled horizontally with a gantry machining center. However, the inner side distance size of the connecting beam after welding is unstable. If a fixed support is used, there is a gap between the support and the two arms of the connecting beam. When drilling, the two arms of the connecting beam will be deformed by force, causing the axis of the drilled hole to tilt and the coaxiality of the two holes to be out of tolerance. Therefore, there is an urgent need for a connecting beam drilling fixture suitable for the post-weld drilling process. Summary of the invention:

[0003] The problem to be solved by the present invention is to provide a drilling fixture that can prevent loosening during drilling and can reliably support the two arms of the connecting beam in view of the above shortcomings. The technical solution is as follows:

[0004] It includes a tire frame, a middle support body and an end support body; the tire frame is provided with a clamping device, a slide plate and a top plate, the slide plate is located in the middle of the tire frame, the slide plate is provided with two left and right slide grooves, and the top plates are respectively located at the two ends of the tire frame; the middle support body includes a middle fixed inclined wedge, a middle movable inclined wedge and a transverse wedge block, the transverse wedge block is located in the slide groove, the middle movable inclined wedge is located on the transverse wedge block, a bolt is installed at the lower end of the middle movable inclined wedge, the bolt passes through the slide groove and a return spring is installed to act on the spring plate, the middle fixed inclined wedge Fixed on the slide plate, the middle fixed inclined wedge is narrow at the bottom and wide at the top to form an inverted inclined surface, which cooperates with the positive inclined surface of the middle movable inclined wedge, and a double-headed screw is installed between the two horizontal wedge blocks; the end support body includes an end fixed inclined wedge, an end movable inclined wedge, an upper release inclined wedge and a lower release inclined wedge, the end fixed inclined wedge and the lower release inclined wedge are fixed on the top plate of the tire frame, the end fixed inclined wedge is narrow at the top and wide at the bottom to form a positive inclined surface, which cooperates with the reverse inclined surface on the end movable inclined wedge, and the inclined surface of the upper release inclined wedge cooperates with the inclined surface of the lower release inclined wedge.

[0005] The end of the tire frame is provided with an end positioning stop.

[0006] The double-headed screw has a left thread at one end and a right thread at the other end, and a corresponding thread is provided at a corresponding position at one end of the transverse wedge.

[0007] The middle of the double-headed screw is provided with holes, and the holes are evenly distributed at 60 degrees.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The drilling fixture utilizes the different thicknesses formed by paired inclined surfaces to adapt to different inner distance sizes of connecting beams. It has wide adaptability and is simple and convenient to operate.

[0010] 2. Since the inclined wedge has a self-locking effect, it can prevent the formed internal support from loosening during drilling, reliably support the two arms of the connecting beam, and prevent the hole axis from tilting due to the drilling force. The two holes drilled have a high coaxiality, which meets the drilling requirements. Description of the drawings:

[0011] Figure 1 , is a schematic diagram of the connecting beam structure;

[0012] Figure 2 , is a schematic diagram of the structure of the present invention;

[0013] Figure 3 , is a schematic diagram of the tire frame structure of the present invention;

[0014] Figure 4 , is a schematic diagram of the structure of the middle support body of the present invention;

[0015] Figure 5 , is a schematic diagram of the end support structure of the present invention. Specific implementation method:

[0016] See also Figure 1 to Figure 5The present invention provides a connecting beam drilling fixture, the key technology of which is that it includes a tire frame 1, a middle support body 2 and an end support body 3; the tire frame 1 is provided with a clamping device 1.2, a slide plate 1.3 and a top plate 1.4, the slide plate 1.3 is located in the middle position of the tire frame, and the slide plate 1.3 is provided with two left and right slide grooves 1.5, the top plate 1.4 is respectively located at both ends of the tire frame, the tire frame 1 is used for positioning and clamping the connecting beam 4, and is connected to the machine tool; the middle support body 2 mainly realizes wedging and support from bottom to top, including a middle fixed inclined wedge 2.1, a middle movable inclined wedge 2.2 and a transverse wedge block 2.3, the transverse wedge block 2.3 is located in the slide groove 1.5, the slide groove 1.5 limits the moving trajectory of the transverse wedge block 2.3, the middle movable inclined wedge 2.2 is located on the transverse wedge block 2.3, the lower end of the middle movable inclined wedge 2.2 is installed with a bolt 2.7, and the bolt 2.7 passes through the slide groove 1.5 and then the return spring 2.5 is set to act on The spring plate 2.8 and the middle fixed inclined wedge 2.1 are welded and fixed on the slide plate 1.3. The middle fixed inclined wedge 2.1 is narrow at the bottom and wide at the top to form an inverted inclined surface, which cooperates with the positive inclined surface of the middle movable inclined wedge 2.2 to form an inclined wedge assembly of different thicknesses to adapt to different inner side distances of the connecting beam. It is wedged between the two arms of the connecting beam to prevent the two arms of the connecting beam from deforming during drilling. A double-headed screw 2.4 is installed between the two transverse wedge blocks 2.3; the end support body 3 mainly realizes wedging and support from top to bottom, including an end fixed inclined wedge 3.1, an end movable inclined wedge 3.2, an upper releasing inclined wedge 3.3 and a lower releasing inclined wedge 3.4. The end fixed inclined wedge 3.1 and the lower releasing inclined wedge 3.4 are welded and fixed on the top plate 1.4 of the tire frame. The end fixed inclined wedge 3.1 is narrow at the top and wide at the bottom to form a positive inclined surface, which cooperates with the reverse inclined surface on the end movable inclined wedge 3.2 to form an inclined wedge assembly of different thicknesses to adapt to different inner side distances of the connecting beam. The inclined surface of the upper release inclined wedge 3.3 cooperates with the inclined surface of the lower release inclined wedge 3.4 to push the end movable inclined wedge 3.2 upward.

[0017] The end of the tire frame 1 is provided with an end positioning stop 1.1.

[0018] The double-headed screw rod 2.4 has a left thread at one end and a right thread at the other end, and a corresponding thread is provided at a corresponding position at one end of the transverse wedge block 2.3.

[0019] The middle of the double-ended screw rod 2.4 is provided with three holes 2.6, which are evenly spaced at 60 degrees, so that after the double-ended screw rod is rotated, there are still holes facing the operator, which is convenient for inserting the wrench rod.

[0020] The working process of the present invention is as follows:

[0021] 1) See Figure 1 to Figure 4 , hoist the connecting beam 4 into the drilling fixture, position it by the end positioning block 1.1, the middle fixed wedge 2.1, and the end fixed wedge 3.1, and clamp it with the clamping device 1.2;

[0022] 2) Since the double-headed screw 2.4 has a left thread at one end and a right thread at the other end, and the corresponding part of the transverse wedge block 2.3 has a corresponding thread at one end, the transverse wedge blocks on both sides will move outward or inward at the same time when rotating. Figure 2 , Figure 4 As shown, the double-headed screw 2.4 rotates forward to push the lateral wedge 2.3 outward, and the inclined surface of the lateral wedge 2.3 pushes the bottom inclined surface of the middle movable inclined wedge 2.2 to make the middle movable inclined wedge 2.2 rise. At the same time, the middle movable inclined wedge 2.2 drives the bolt 2.7 and the spring plate 2.8 to rise, compressing the return spring 2.5, and lifting the middle movable inclined wedge 2.2 to form the inner support of the two arms of the connecting beam 4;

[0023] 3) If Figure 2 , Figure 5 As shown, the end movable inclined wedge 3.2 is installed from the top and is tightly supported between the two arms of the connecting beam 4;

[0024] 4) Drilling in gantry machining center;

[0025] 5) If Figure 4 As shown, the double-headed screw 2.4 rotates in the opposite direction, driving the transverse wedge 2.3 to slide inward, and the middle movable inclined wedge 2.2 descends under the action of the return spring 2.5, releasing the wedge tightening force;

[0026] 6) If Figure 2 , Figure 5 As shown, insert the release wedge 3.3 from the end, push the movable wedge 3.2 upward, and release the wedge tightening force;

[0027] 7) Release the clamping device 1.2 to complete the drilling process.

Claims

1. A connecting beam drilling fixture, comprising a tire frame (1), a middle support body (2) and an end support body (3); the tire frame (1) is provided with a clamping device (1.2), a slide plate (1.3) and a top plate (1.4), characterized in that The slide plate (1.3) is located in the middle of the tire frame, and two left and right slide grooves (1.5) are opened on the slide plate (1.3), and the top plate (1.4) is respectively located at the two ends of the tire frame; the middle support body (2) includes a middle fixed inclined wedge (2.1), a middle movable inclined wedge (2.2) and a transverse wedge block (2.3), the transverse wedge block (2.3) is located in the slide groove (1.5), the middle movable inclined wedge (2.2) is located on the transverse wedge block (2.3), a bolt (2.7) is installed at the lower end of the middle movable inclined wedge (2.2), and the bolt (2.7) passes through the slide groove (1.5) and is then installed with a return spring (2.5) to act on the spring plate (2.8), and the middle fixed inclined wedge (2.1) is fixed on the slide plate (1.3) The middle fixed inclined wedge (2.1) is narrow at the bottom and wide at the top to form an inverted inclined surface, which cooperates with the positive inclined surface of the middle movable inclined wedge (2.2), and a double-headed screw (2.4) is installed between the two transverse wedge blocks (2.3); the end support body (3) comprises an end fixed inclined wedge (3.1), an end movable inclined wedge (3.2), an upper release inclined wedge (3.3) and a lower release inclined wedge (3.4), the end fixed inclined wedge (3.1) and the lower release inclined wedge (3.4) are fixed on the top plate (1.4) of the tire frame, the end fixed inclined wedge (3.1) is narrow at the top and wide at the bottom to form a positive inclined surface, which cooperates with the reverse inclined surface on the end movable inclined wedge (3.2), and the inclined surface of the upper release inclined wedge (3.3) cooperates with the inclined surface of the lower release inclined wedge (3.4); The end of the tire frame (1) is provided with an end positioning stop (1.1); The double-headed screw (2.4) has a left thread at one end and a right thread at the other end, and a corresponding thread is provided at a corresponding position at one end of the transverse wedge (2.3); A hole (2.6) is provided in the middle of the double-headed screw (2.4); There are three holes (2.6), and the holes are evenly spaced at 60°. The working process of a connecting beam drilling fixture is as follows: 1) The connecting beam (4) is hoisted into the drilling fixture, positioned by the end positioning block (1.1), the middle fixed wedge (2.1), and the end fixed wedge (3.1), and clamped with the clamping device (1.2); 2) A left-hand thread is provided at one end of the double-headed screw rod (2.4), and a right-hand thread is provided at the other end. A corresponding thread is provided at a corresponding position at one end of the transverse wedge block (2.3). When rotating, the transverse wedge blocks on both sides will move outward or inward at the same time. The double-headed screw rod (2.4) rotates in the positive direction to push the transverse wedge blocks (2.3) outward. The inclined surface of the transverse wedge blocks (2.3) pushes the bottom inclined surface of the middle movable inclined wedge (2.2) to make the middle movable inclined wedge (2.2) rise. At the same time, the middle movable inclined wedge (2.2) drives the bolt (2.7) and the spring plate (2.8) to rise, compressing the return spring (2.5) and lifting the middle movable inclined wedge (2.2) to form the inner support of the two arms of the connecting beam (4); 3) Install the end movable inclined wedge (3.2) from above and tightly support it between the two arms of the connecting beam (4); 4) Drilling in gantry machining center; 5) The double-headed screw (2.4) rotates in the opposite direction, driving the transverse wedge (2.3) to slide inward, and the middle movable inclined wedge (2.2) descends under the action of the return spring (2.5), releasing the wedge tightening force; 6) Insert the release wedge (3.3) from the end, push the movable wedge (3.2) upward, and release the wedge tightening force; 7) Release the clamping device (1.2) to complete the drilling process.

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