Positioning tool for machining pin hole on integral cast slide plate

Abstract

The utility model relates to the processing technology of railway product, aims at providing a kind of positioning tool for the machining of integral casting slide plate upper pinhole. The positioning tool includes horizontal base and vertical stand, and stand is fixedly installed in the center of base, and both constitute inverted T character structure;Positioning module, longitudinal adjusting module and compression module are equipped on the front of stand, and transverse limiting module is equipped on the back of stand. The utility model utilizes each module fastened on stand to fix integral casting slide plate on stand in the way of suspended lateral placement, facilitates the operation of vertical drilling of drilling machine tool, accords with operation habit;Each module and integral casting slide plate are fixed between using the way of point contact, avoid the abrasion to tool itself;Using replaceable positioning pin and positioning bolt, can prolong the service life of tool;It can provide calibration reference based on the reference of stand for slide bed plate, ensure the accuracy of pinhole processing direction and processing size, improve the yield of integral casting slide plate.

Description

Technical Field

[0001] This utility model relates to the processing technology of railway products, and in particular to a positioning fixture for machining pin holes on a cast slide plate. Background Technology

[0002] A turnout switch is a crucial piece of equipment that uses a switch machine to pull the turnout switch rails, enabling vehicles to switch between different tracks. To ensure the turnout slide plates can operate reliably and sustainably under conditions of high speed, heavy load, severe wear, and corrosion, a more and more integral casting process is being used to manufacture the slide plates, as described in patent documents CN111827014A and CN209669606U. The structure of such slide plate products is typically as follows... Figure 1 As shown, it includes a slide table with a central cavity and a wedge-shaped portion, a spring piece installed in the cavity, and a pin passing through a pin hole; the wedge-shaped portion of the slide table and the end of the spring piece are used to press against the bottom surface of the rail to prevent the stock rail from turning outward; the pin presses down on the middle of the spring piece to prevent the spring piece from coming off during repeated travel.

[0003] The machining of integrally cast slide plates typically involves two processes: casting and drilling. The drilling process includes machining vertical mounting holes and horizontal pin holes, the latter being a persistent challenge for operators. According to the design drawings, all integrally cast slide plates are positioned and sized using the side edge of the slide table support groove as a reference. For overall cost considerations, manufacturers do not trim the contour edges of the integrally cast slide plates, as this would increase costs without improving product performance. Most drilling requirements for integrally cast slide plates are perpendicular to the horizontal plane; therefore, drilling equipment is usually not equipped with additional drill bits for horizontal machining, which would also increase equipment costs. In this situation, currently, when machining pin holes on the production line, workers need to hold the integrally cast slide plate vertically with the side edge facing down and then use a vertical drill bit to machine the pin holes. Because positioning the side edge of the slide table support groove is difficult, the contour edge of the slide plate must be used for positioning during this process. However, because the casting precision requirements are not high, the contour edges of the integrally cast slide plate are not perfectly straight. This means that existing machining methods may cause deviations in the direction of the pin holes during machining due to product side deviations. Consequently, during on-site installation, pin installation may become difficult or even impossible.

[0004] Therefore, in order to meet the requirement of accurate positioning when drilling pin holes on a solid casting slide plate, a new solution needs to be proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a positioning fixture for machining pin holes on a cast slide plate.

[0006] To solve the technical problem, the solution of this utility model is:

[0007] A positioning fixture for machining pin holes on a cast-in-place slide plate is provided, comprising a horizontal base and a vertical plate, the plate being fixedly installed in the center of the base, forming an inverted T-shape. A positioning module, a longitudinal adjustment module, and a clamping module are provided on the front of the plate, and a lateral limiting module is provided on the back of the plate.

[0008] The positioning module includes a positioning block with a stepped convex surface on the lower side, which is fixed to the middle of the vertical plate by the stepped convex surface; two positioning pins are provided on the vertical edge of the positioning block for positioning by fitting with the side of the slide table bearing groove on the integral casting slide plate; a positioning bolt is provided on the upper edge of the stepped convex surface of the positioning block for supporting the middle position of the lower contour edge of the integral casting slide plate.

[0009] The lateral limiting module includes an L-shaped top block composed of a long plate and a short plate. The long plate is attached and fixed to the tail of the vertical plate, and the short plate extends to the same side as the positioning module. An adjustable screw parallel to the vertical plate is installed through the short plate to press the end of the pad of the integral casting slide plate to achieve lateral limiting.

[0010] The longitudinal adjustment module includes two adjustment seats fixed on the vertical plate, and an adjustable screw parallel to the vertical plate is installed through each adjustment seat. According to the center of gravity of the integral casting slide plate, the screw of one of the adjustment seats is used to push against the lower contour edge of the integral casting slide plate and cooperate with the positioning bolt to adjust the longitudinal height.

[0011] The clamping module includes a strip-shaped clamping block, one end of which is fixed to the vertical plate by a nut and screw assembly, and the other end has a protruding part for clamping in the middle of the integral casting slide plate.

[0012] As an improved solution, the upright plate is fixed to the base by bottom welding, and multiple ribs are arranged parallel and spaced on the back of the upright plate; the ribs are right-angled trapezoids, and their bottom edges and vertical edges are fixedly connected to the base and the upright plate by welding.

[0013] As an improved solution, the base is provided with multiple through mounting holes, which are divided into two groups and evenly arranged on both sides of the upright plate; at least one keyway is provided on the lower surface of the base along its length.

[0014] As an improved solution, multiple through holes are provided on the stepped convex surface of the positioning block, and the positioning block is fixed to the upright plate by a nut and screw assembly.

[0015] As an improved solution, a countersunk hole is provided on the vertical edge of the positioning block, and the positioning pin is installed in the countersunk hole by insertion, with the head of the positioning pin protruding outside the countersunk hole; a screw hole is provided on the upper edge of the stepped convex surface of the positioning block, and the positioning bolt is installed in the hole by screwing, with the bolt head protruding.

[0016] As an improved solution, two alternating raised platforms of equal height are provided on the front of the vertical plate to fit the bottom surface of the integrally cast slide plate for support; a cavity is formed between the slide platform and the vertical plate.

[0017] As an improved solution, in the lateral limiting module and the longitudinal adjustment module, the end of the lead screw has a hexagonal nut, and its installation depth can be adjusted by any of the following installation methods:

[0018] (1) A through screw hole is provided on the short plate or adjusting seat, and the lead screw is installed in the screw hole using a suitable external thread;

[0019] (2) A through hole is provided on the short plate or adjusting seat, the lead screw passes through the through hole and is installed using a suitable nut.

[0020] As an improved solution, the two adjustment seats in the longitudinal adjustment module are respectively located on both sides of the positioning module and are fixedly connected to the surface of the vertical plate by welding.

[0021] As an improved solution, the pressure block and the upright plate are respectively provided with corresponding through holes. After the screw in the nut screw assembly passes through the through hole, it is locked and fixed by using a matching nut.

[0022] As an improved solution, the protruding part of the pressure block refers to the stepped convex surface that is higher than the surface of the pressure block, or the curved and raised end of the pressure block.

[0023] Compared with the prior art, the technical effects of this utility model are:

[0024] 1. In the tooling of this utility model, the positioning module, the horizontal limiting module, the vertical adjustment module and the clamping module fastened to the vertical plate are used to fix the integral casting slide plate to the vertical plate in a suspended side position, which facilitates the vertical drilling operation of the drilling machine and conforms to the operating habits.

[0025] 2. The modules in this fixture are fixed to the integral casting slide plate by point contact, which avoids wear on the fixture itself caused by the integral casting slide plate; the use of replaceable locating pins and locating bolts can extend the service life of the fixture.

[0026] 3. By vertically fastening the integral cast slide plate to the tooling stand, a calibration reference can be provided for the slide plate based on the stand, thereby ensuring the accuracy of the pin hole machining direction and machining dimensions as much as possible and improving the yield of integral cast slide plates.

[0027] 4. By using the adjustable lead screw in the longitudinal adjustment module, the levelness of the integral casting slide plate with uneven contour edges can be adjusted, avoiding additional trimming operations and reducing overall processing costs. Attached Figure Description

[0028] Figure 1 This is a structural schematic diagram of a cast-in-place slide plate product.

[0029] Figure 2 A schematic diagram of using the positioning fixture of this utility model to position and clamp the integral casting slide plate.

[0030] Figure 3 A schematic diagram of the front of the base and the upright.

[0031] Figure 4 A schematic diagram of the back of the base and the upright plate.

[0032] Figure 5 A schematic diagram of the positioning module.

[0033] Figure 6 A schematic diagram of the lateral limiting module.

[0034] Figure 7 A schematic diagram of the longitudinal adjustment device.

[0035] Figure 8 A schematic diagram of the clamping device.

[0036] Figure 9 Installation diagram of the clamping device.

[0037] The attached figures are labeled as follows: 1. Base; 2. Positioning module; 3. Lateral limit module; 4. Longitudinal adjustment module; 5. Pressing module; 6. Vertical plate; 7. Positioning module mounting hole; 8. Lateral limit module mounting hole; 9. Adjustment seat; 10. Pressing module mounting hole; 11. Base mounting hole; 12. Keyway; 13. Rib; 14. Positioning pin; 15. Positioning bolt; 16. Top block; 17. Lead screw; 18. Nut; 19. Pressure block; 20. Slide table. Detailed Implementation

[0038] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0039] The serial numbers assigned to components in this application, such as "first" and "second," are merely for distinguishing the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "front," and "back," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] 1. Structural Description of the Present Invention

[0041] Figure 1 The diagram below shows the structure of a typical integrally cast slide plate. The positioning fixture described in this invention will be used for... Figure 1 The following parts of the integral casting slide plate are supported or pressed: A1-side of the slide table support groove; A2-side of the slide table support groove; A3-middle position of the lower contour edge; B-end of the pad plate; C1-lower contour edge; C2-lower contour edge; D-middle position of the slide table.

[0042] Figures 2 to 4 This invention illustrates a positioning fixture for machining pin holes on a cast-in-place slide plate. The fixture includes a horizontal base 1 and a vertical support plate 6. The support plate 6 is fixed to the center of the base 1 by bottom welding, forming an inverted T-shape. A positioning module 2, a longitudinal adjustment module 4, and a clamping module 5 are provided on the front of the support plate 6, while a lateral limiting module 3 is provided on the back. Multiple through-holes 11 are provided on the base 1, arranged in two groups evenly on both sides of the support plate 6, for fixing the entire fixture to the drilling platform with bolts. At least one keyway 12 is provided along the length of the lower surface of the base 1, allowing for quick positioning during fixture installation and ensuring the fixture does not shift during machining. Two alternately arranged, equal-height raised platforms are provided on the front of the support plate 6 (i.e., the vertical surface used to fit and install the cast-in-place slide plate). The bottom surface of the cast-in-place slide plate after fastening is supported by these two raised platforms, creating a cavity between the slide plate 20 and the support plate 6. This design aims to reduce the contact area between the slide plate and the tooling, thereby better ensuring positioning accuracy.

[0043] Positioning module 2, for example Figure 5As shown, a positioning block with a stepped convex surface on its lower side is fixed to the lower center of the vertical plate 6 by the stepped convex surface. Multiple through-holes 7 for mounting positioning modules are provided on the stepped convex surface of the positioning block, and the positioning block is fixed to the vertical plate by a nut and screw assembly. Two countersunk holes are provided on the vertical edge of the positioning block, into which positioning pins 14 are inserted. The heads of the positioning pins 14 protrude outside the countersunk holes, and are used to fit against the sides A1 and A2 of the slide table 20 slide table bearing groove for positioning. A screw hole is provided on the upper edge of the stepped convex surface of the positioning block, and a positioning bolt 15 is installed therein by screwing, with the bolt head protruding, to support the middle position A3 of the lower contour edge of the integrally cast slide table.

[0044] Lateral limiting module 3 Figure 6 As shown, it includes an L-shaped top block 16 composed of a long plate and a short plate. The long plate is fixed to the tail of the vertical plate 6, and the short plate extends to the same side as the positioning module 2. An adjustable lead screw 17 parallel to the vertical plate 6 is installed through the short plate to achieve lateral limiting by pressing the end B of the pad plate of the integral casting slide plate.

[0045] Vertical adjustment module 4, as shown Figure 7 As shown, it includes two adjustment seats 9 respectively located on both sides of the positioning module 2 and fixed to the surface of the vertical plate 6 by welding. Each adjustment seat 9 has an adjustable lead screw 17 parallel to the vertical plate 6 running through it, which is used to press against the lower contour edge C1 or C2 of the integral casting slide plate; this design is to adjust the longitudinal height by using the lead screw of one of the adjustment seats in conjunction with the positioning bolt 15 according to the difference in the center of gravity of different integral casting slide plate products.

[0046] As an optional example, in the lateral limiting module 3 and the longitudinal adjustment module 4, the end of the lead screw 17 has a hexagonal nut, and its installation depth can be adjusted by any of the following installation methods: a through screw hole is provided on the short plate or the adjustment seat 9, and the lead screw 17 is installed in the screw hole using a suitable external thread; or, a through hole is provided on the short plate or the adjustment seat 9, and the lead screw 17 passes through the through hole and is installed using a suitable nut 18.

[0047] Clamping module 5 Figure 8 , 9 As shown, a strip-shaped pressure block 19 is included, one end of which is fixed to the vertical plate 9 by a nut and screw assembly, and the other end has a protruding portion for pressing against the middle position of the integrally cast slide plate (e.g., slide table 20). As an optional example, corresponding through holes are provided on the pressure block 19 and the vertical plate 6, respectively. After the screw 17 in the nut and screw assembly passes through the through hole, it is locked and fixed by a matching nut 18. The protruding portion of the pressure block 19 refers to a stepped convex surface that protrudes above its surface, or a bent and raised end.

[0048] 2. How to use positioning fixtures

[0049] The tooling of this invention can accurately fix the integral casting slide plate and restrict its movement in the X, Y and Z axes, so that the drilling platform can perform the drilling operation of the pin hole on the slide plate and ensure that the drilling accuracy meets the design requirements.

[0050] Before using the positioning fixture, quickly align the keyway 12 on the base plate 1 with the keyway on the drilling machine, and secure the entire fixture to the machine by inserting bolts into the base mounting holes 11. The positioning module mounting holes 7, the lateral limit module mounting holes 8, and the clamping module mounting holes 10 on the vertical plate 6 are used with corresponding nut and screw assemblies to install the positioning module 2, the lateral limit module 3, and the clamping module 5, respectively. During installation, the nut can be screwed only into the end of the screw, leaving sufficient space for the integral casting slide plate.

[0051] When using the positioning fixture, insert the integral casting slide plate from top to bottom between each module and the vertical plate 6, and then tighten each screw or nut one by one. First, use the screw in the transverse limiting module 3 to push the integral casting slide plate towards the positioning module 2, so that the reference surface of the slide table 20 is in contact with the two positioning pins 14 and positioning bolts 15 in the positioning module 2. The positioning bolts 15 are supported at the middle position of the lower contour edge of the integral casting slide plate. Then, according to the center of gravity of the integral casting slide plate product, adjust the screw in one set of longitudinal adjustment modules 4 so that the upper end of the screw contacts the lower edge of the integral casting slide plate. Use a spirit level to confirm that the vertical reference surface of the slide table 20 is perpendicular to the horizontal plane (at this time, the integral casting slide plate is in a horizontal state), and then tighten the nuts. Finally, tighten the nuts in the clamping module 5 to press the integral casting slide plate to prevent displacement during processing.

[0052] In positioning module 2: (1) By using two positioning pins 14 to fit against the reference surface of the slide table 20, it can be ensured that the groove of the wedge-shaped part is always in a vertical position, thereby ensuring that the drilling direction of the pin hole remains vertical; (2) The positioning pins 14 are made of alloy steel to increase wear resistance, reduce the contact surface between the slide table 20 and the positioning fixture, and extend the service life; (3) The positioning bolts 15 serve as a support point to reduce the contact surface between the side of the integrally cast slide plate and the positioning block; (4) The positioning pins 14 and positioning bolts 15 can be replaced at any time after being worn out by long-term use, avoiding direct wear on the positioning block and reducing the cost of use.

[0053] After the integral cast slide plate is fastened and positioned in the X, Y, and Z axes, drilling can be performed at the predetermined position using the drilling machine's own ranging and positioning equipment. The fixture itself remains fixed on the machine tool, and the integral cast slide plate is constrained by the fixture during drilling, thus ensuring that the machining accuracy of the pin holes meets design requirements.

[0054] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A positioning fixture for machining pin holes on a cast slide plate, characterized in that, It includes a horizontal base and a vertical stand, with the stand fixedly installed in the center of the base, forming an inverted T-shape. The front of the stand features a positioning module, a longitudinal adjustment module, and a clamping module, while the back of the stand has a lateral limiting module. The positioning module includes a positioning block with a stepped convex surface on the lower side, which is fixed to the middle of the vertical plate by the stepped convex surface; two positioning pins are provided on the vertical edge of the positioning block for positioning by fitting with the side of the slide table bearing groove on the integral casting slide plate; a positioning bolt is provided on the upper edge of the stepped convex surface of the positioning block for supporting the middle position of the lower contour edge of the integral casting slide plate. The lateral limiting module includes an L-shaped top block composed of a long plate and a short plate. The long plate is attached and fixed to the tail of the vertical plate, and the short plate extends to the same side as the positioning module. An adjustable screw parallel to the vertical plate is installed through the short plate to press the end of the pad of the integral casting slide plate to achieve lateral limiting. The longitudinal adjustment module includes two adjustment seats fixed on the vertical plate, and an adjustable screw parallel to the vertical plate is installed through each adjustment seat. According to the center of gravity of the integral casting slide plate, the screw of one of the adjustment seats is used to push against the lower contour edge of the integral casting slide plate and cooperate with the positioning bolt to adjust the longitudinal height. The clamping module includes a strip-shaped clamping block, one end of which is fixed to the vertical plate by a nut and screw assembly, and the other end has a protruding part for clamping in the middle of the integral casting slide plate.

2. The positioning fixture according to claim 1, characterized in that, The upright plate is fixed to the base by bottom welding, and multiple ribs are arranged parallel and spaced on the back of the upright plate; the ribs are right trapezoidal, and their bottom edge and vertical edge are fixedly connected to the base and the upright plate by welding.

3. The positioning fixture according to claim 1, characterized in that, The base has multiple through mounting holes, which are divided into two groups and evenly arranged on both sides of the upright plate; the lower surface of the base has at least one keyway along its length.

4. The positioning fixture according to claim 1, characterized in that, Multiple through holes are provided on the stepped convex surface of the positioning block, and the positioning block is fixed to the upright plate by a nut and screw assembly.

5. The positioning fixture according to claim 1, characterized in that, A countersunk hole is provided on the vertical edge of the positioning block, and the positioning pin is installed in the countersunk hole by insertion, with the head of the positioning pin protruding outside the countersunk hole; a screw hole is provided on the upper edge of the stepped convex surface of the positioning block, and the positioning bolt is installed in the screw by screwing, with the bolt head protruding.

6. The positioning fixture according to claim 1, characterized in that, Two alternating raised platforms of equal height are provided on the front of the vertical plate to fit the bottom surface of the integrally cast slide plate for support; a cavity is formed between the slide platform and the vertical plate.

7. The positioning fixture according to claim 1, characterized in that, In the lateral limiting module and the longitudinal adjustment module, the end of the lead screw has a hexagonal nut, and its installation depth can be adjusted by any of the following installation methods: (1) A through screw hole is provided on the short plate or adjusting seat, and the lead screw is installed in the screw hole using a suitable external thread; (2) A through hole is provided on the short plate or adjusting seat, the lead screw passes through the through hole and is installed using a suitable nut.

8. The positioning fixture according to claim 1, characterized in that, The two adjustment seats in the longitudinal adjustment module are respectively located on both sides of the positioning module and are fixedly connected to the surface of the vertical plate by welding.

9. The positioning fixture according to claim 1, characterized in that, The pressure block and the upright plate are respectively provided with corresponding through holes. After the screw in the nut screw assembly passes through the through hole, it is locked and fixed by the matching nut.

10. The positioning fixture according to claim 1, characterized in that, The protruding part of the pressure block refers to the stepped convex surface that protrudes above the surface of the pressure block, or the curved and raised end of the pressure block.

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