Tool for adjusting precise large-diameter circular boring cutter of high-speed rail large-part product

Abstract

A tool for adjusting a precise large-diameter circular boring cutter of a high-speed rail large-part product belongs to the technical field of special machining, and is characterized in that symmetrical threaded holes are formed in two sides of a base steel plate, symmetrical circular holes are formed in two sides of a bottom plate of a base frame and are correspondingly matched with the threaded holes of the base steel plate, and the centers of two side plates are fixed on the bottom plate; the edge, close to the center of the tool, of the upper plate is machined to be semicircular, a groove is machined in the middle of the upper plate and matched with a boss machined on the aluminum plate, the complementary plate is welded and fixed to the tail end of the upper side of the base frame, the threaded sleeve is welded and fixed to the middle of the upper face of the complementary plate, countersunk sliding grooves are formed in the two sides of the aluminum plate, and hexagon socket screws can be placed in the countersunk sliding grooves to slide. The edge close to the center of the tool is machined to be semicircular, and inner hexagon bolts penetrate through countersunk head sliding grooves of the aluminum plate to be matched and fixed with threaded holes of the upper plate. The beneficial effect is that the effect of saving working hours is achieved. The machine occupation time of the machine tool is greatly reduced, the machine tool has more time to process and deliver finished products, the delivery period is shortened, and the workshop production takt is more compact.

Description

Technical Field

[0001] This utility model belongs to the field of special machining technology and relates to an improvement of a boring tool adjustment and machining fixture for railcar body products that requires high precision. Background Technology

[0002] In the machining workshop of rail passenger vehicles, a circle with a tolerance of φ300H8 needs to be machined. This circle has a very high precision and cannot be machined using a milling cutter under normal conditions. It can only be machined using a boring cutter. However, before machining with the boring cutter, the machining diameter of the cutter head needs to be adjusted to ensure the accuracy requirements. The diameter adjustment of the boring cutter cannot be made on the finished product.

[0003] Currently, the workshop adjusts the boring tool by using aluminum profiles with a width exceeding 300mm, a length of 2500mm, and a sheet thickness exceeding 22mm, fixed on the machine tool beam for adjustment. First, a φ40mm end mill is used for helical feed, slowly expanding the hole outwards. When the theoretical allowance on one side is 2mm, a 20mm end mill is used to continue enlarging the hole. When the allowance on one side is 0.2-0.3mm, a boring tool is used to adjust the enlargement to the φ300H tolerance requirement.

[0004] Each adjustment of the 300 boring tool takes 1.3 hours. Each adjustment of the boring tool requires changing the position and repeating the above steps. These products are all 60-meter gantry five-axis machining centers, which occupy the machine for a long time, affecting production efficiency and wasting resources. The workshop production cannot be reasonably allocated. Summary of the Invention

[0005] The purpose of this utility model is to provide a tooling for adjusting a precision large-diameter circular boring tool for high-speed rail components. When using this tooling for boring tool adjustment, the original 40mm milling cutter hole enlargement process can be saved, thereby achieving the effect of saving time.

[0006] The technical solution of this utility model is as follows: symmetrical threaded holes are machined on both sides of the base steel plate, and the upper base frame is tightened and fixed with bolts through the threaded holes. The bottom plate of the base frame has symmetrically machined round holes on both sides that correspond to the threaded holes of the base steel plate. Two side plates of the same size are symmetrically centered and vertically fixed on the bottom plate. The upper plate is machined into a semi-circle near the center of the tooling, and the width and length of the upper plate are smaller than the aluminum plate. A groove is machined in the middle of the upper plate to cooperate with the boss machined on the aluminum plate. A set of threaded holes is machined on both sides of the upper plate. A supplementary plate is welded and fixed to the upper tail end of the base frame. A threaded sleeve is welded and fixed to the middle of the supplementary plate. Two oblong countersunk grooves are machined on each side of the aluminum plate. Each countersunk groove can accommodate an internal hexagon bolt for sliding. The bottom of the aluminum plate is a boss, which is machined into a semi-circle near the center of the tooling. The internal hexagon bolt passes through the countersunk groove of the aluminum plate and cooperates with the threaded hole of the upper plate for fixation.

[0007] The beneficial effects of this utility model are:

[0008] Using this fixture for boring tool adjustment eliminates the need for the traditional 40mm milling cutter hole enlargement process, thus saving time. Two aluminum plates (4) are paired to form a complete circle. After each boring tool adjustment, only the hex bolts (5) need to be loosened, and the tightening bolts (2) tightened to move the two aluminum plates (4) 2-3mm each time, achieving the desired boring tool adjustment. A single batch of aluminum plates (4) can be reused multiple times. Furthermore, when the aluminum plate (4) is no longer needed for machining, it can be replaced with a new one. This saves on aluminum profiles with a width exceeding 300mm, a length exceeding 2500mm, and a wall thickness exceeding 22mm. This represents savings in consumables. This boring tool adjustment method reduces workshop time from 1.3 hours to 0.2 hours, saving 1.1 hours per 60mm gantry five-axis machining center. This significantly reduces machine downtime, allowing more time for finished product processing, shortening delivery cycles, and making the workshop production rhythm more efficient. Attached Figure Description

[0009] Figure 1 This is the main view of the tooling of this utility model:

[0010] Figure 2 This is a top view of the tooling of this utility model:

[0011] Figure 3 This is the main view of the base frame of this utility model:

[0012] Figure 4 This is a left view of the base frame of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings:

[0014] As shown in the figure, 1 is the base frame, 2 is the tightening bolt, 3 is the base steel plate, 4 is the aluminum plate, 5 is the hex bolt, 1.1 is the top plate, 1.2 is the supplementary plate, 1.3 is the side plate, 1.4 is the bottom plate, and 1.5 is the threaded sleeve.

[0015] The fixture is fixed to the upper base frame 2 by bolts 5 through symmetrical threaded holes machined on both sides of the base steel plate 3. The base frame 2 is a welded mechanism, with symmetrical round holes machined on both sides of the base plate 1.4 corresponding to the threaded holes of the base steel plate 3. Two identical side plates 1.3 are symmetrically placed on the base plate 1.4 and fixed by welding. The upper plate 1.1 is machined into a semi-circle near the center of the fixture, and the width and length of the upper plate 1.1 are smaller than those of the aluminum plate 4. A groove is machined in the middle of the upper plate 1.1 to mate with the boss machined on the aluminum plate 4, so that the aluminum plate 4 can maintain the same direction during movement through the groove. The upper plate 1.1 covers the side plates 1.3 and is also fixed by welding. Four sets of threaded holes are machined on both sides of the upper plate 1.4. A fixing plate 1.2 is welded to the upper tail end of the base frame 2. A threaded sleeve 1.5 is welded to the middle of the upper part of the fixing plate 1.2. Two oblong countersunk grooves are machined on each side of the aluminum plate 4. Each countersunk groove can accommodate a sliding hexagonal bolt. A 5mm boss is machined on the lower part of the aluminum plate 4, with the edge near the center of the tooling machined into a semi-circle. The hexagonal bolt 5 passes through the countersunk groove of the aluminum plate 4 and mates with the threaded hole of the upper plate 1.1 to achieve a fixing effect. In order to allow for multiple boring tool adjustments, after the first boring tool adjustment, the hexagonal bolt 5 can be loosened for the second adjustment, and the tightening bolt 2 can be tightened. The tightening bolt 2 mates with the threaded sleeve 1.5. As the threads are tightened, the aluminum plate 4 is pushed and moved within the groove of the upper plate 1.1. When the movement reaches the adjustment requirement by 2-3mm, it is fixed again by the hexagonal bolt 5. The other end of the aluminum plate 4 is adjusted in the same way. In this way, after each adjustment of the boring tool, it is only necessary to loosen the internal hex bolt 5 and move the aluminum plate 4 to achieve the purpose of repeatedly adjusting the boring tool on the same aluminum plate.

[0016] A fixture is fabricated to replace the aluminum profile boring tool adjustment. This fixture uses two 27mm thick aluminum plates, each less than 300mm wide, with one side machined into a semi-circle. The two plates can be combined to form a complete circle. Two oblong countersunk grooves are machined on each side of the aluminum plates, each groove accommodating hexagonal socket bolts. A 5mm boss is machined on the bottom of the aluminum plates, engaging with a groove on the upper plate of the base frame to ensure the orientation of the two aluminum plates when aligned. The base frame consists of an upper plate, two side plates in the middle, and a bottom plate connected by welding. The upper plate has one side machined into a semi-circle, and its width and length are smaller than the aluminum plate. A groove is machined in the middle of the upper plate to engage with the boss on the aluminum plate. Two sets of three threaded holes are machined on each side for securing the upper plate with hexagonal socket bolts. Connecting holes are machined on both sides of the bottom plate. A patch plate is welded to the upper end of the base frame, serving two purposes: first, it provides fixation; second, a threaded sleeve is welded above the patch plate, with its center line concentric with the center of the aluminum plate. The threaded sleeve works in conjunction with a tightening bolt, and tightening the bolt propels the aluminum plate forward. Hex socket head cap bolts are secured to the aluminum plate via countersunk grooves and corresponding threaded holes in the upper plate. This fixture features a semi-circular design with two symmetrical points connected by the base steel plate. Threaded holes are machined into the base steel plate at corresponding positions on the base frame floor for bolt fixation. Long oval grooves are machined at both ends of the base steel plate for connection to machine tool fixtures.

Claims

1. A tooling for precision large diameter round boring tool adjustment of high speed rail large component products, characterized in that: The symmetric screw holes are processed on both sides of the base steel plate, and are fastened and fixed with the upper base frame through bolts and screw holes. The base frame has symmetric circular holes on both sides of the bottom plate, which are correspondingly matched with the screw holes of the base steel plate. The two side plates with the same size are symmetric in the center and are vertically fixed on the bottom plate. The upper plate is semicircular near the center edge of the tooling, and the width and length of the upper plate are smaller than the aluminum plate. The recess is processed in the middle position of the upper plate and is matched with the boss processed on the aluminum plate. Threaded holes are processed on both sides of the upper plate. The end plate is welded and fixed on the upper side of the base frame. The threaded sleeve is welded and fixed on the middle position of the end plate. Two long circular countersunk grooves are processed on both sides of the aluminum plate. The inner hexagonal bolt can be slid in each countersunk groove. The aluminum plate is a boss below and is semicircular near the center edge of the tooling. The inner hexagonal bolt is fixed through the countersunk groove of the aluminum plate and the threaded hole of the upper plate.

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