Method of mechanical processing of track bracket blanks

Abstract

FIELD: metalworking.SUBSTANCE: invention can be used for processing a set of track bracket blanks on a horizontal milling machining centre with two rotary work tables and one spindle. For processing, the first and second multi-seat hydraulic clamps with different configurations of clamping devices are used, each of which is installed on its own rotary work table. The coordinate systems are set along the X, Y, Z axes, a set of cutting tools is installed in the spindle, the distance along the Z axis is measured for each tool and entered into the numerical control unit. A set of track bracket blanks is installed in the first multi-seat hydraulic clamp and processed in accordance with the first control program. The processed blanks are removed and placed in a second multi-position hydraulic clamp for processing in accordance with the second control program.EFFECT: increased productivity due to the processing of a set of eight track bracket blanks in one technological cycle.12 cl, 21 dwg

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0001] The invention relates to the field of metalworking, namely to methods for processing a set of track bracket blanks on a horizontal milling machining center.

[0002] The invention can be used for mechanical processing of track bracket blanks using a horizontal milling machining center, for example, HMC-500P with two rotary work tables and one spindle. LEVEL OF TECHNOLOGY

[0003] A horizontal type machining center and a method for machining a workpiece are known from the prior art [Japan JP3697697B1, publication date 09 / 21 / 2005].

[0004] The workpiece processing method is as follows:- the table base is set to the 0 degree position, the workpiece is fixed on the rotary table, and the processing program is started;- when one surface of the workpiece is processed, the rotary table is rotated 90 degrees (C axis) and positioned, then the spindle tool is replaced with a new tool from the tool magazine, and the headstock is moved in the directions of the X, Y and Z axes.- after that, the table base is rotated 90 degrees downward and starts processing in a position in which the upper surface of the workpiece is inclined to the side surface;- when all the processing is completed, the table base is also rotated 90 degrees upward, the workpiece is turned over;- the table base is rotated 180 degrees, returns to the original processing position of 0 degrees, and the program is completed;

[0005] The disadvantage of this method is that only one part is processed with one tool; when processing another surface of the workpiece, the tool must be replaced, which generally reduces the productivity of mechanical processing of parts.

[0006] A horizontal machine tool with a double rotary table and a double spindle and a method for processing a workpiece are known from the prior art [CN 115179109 A, publication date 10 / 14 / 2022].

[0007] The method of processing the workpiece includes the following steps: - using a horizontal machine with two rotary tables and two spindles; - selecting the appropriate processing mode in accordance with the characteristics of the workpiece; - fixing the workpiece on the rotary table unit according to the selected processing mode; - the workpiece is processed automatically.

[0008] The disadvantage of this method is that it uses a machine with two spindles.

[0009] A horizontal machining center and a method for machining a workpiece are known from the prior art [CN 116900742 A, publication date 10 / 20 / 2023].

[0010] A method for machining a workpiece using a horizontal machining center includes the following steps:- clamping the workpiece on the work table;- through the movement of the X, Y and Z axes and the rotation of the rotary head, the tool corresponds to the first position of the workpiece;- the tool processes the first position of the workpiece;- after completing the first position to be machined, using the linear movement of the tool along the Z axis and / or the rotational movement of the workbench along the C axis, so that the tool corresponds to the second position of the workpiece;- the tool processes the second position of the workpiece.

[0011] The disadvantage of this method is the inability to process a set of workpieces simultaneously, which reduces the productivity of the machine.

[0012] A clamp for multi-process processing of a track link section is known from the prior art, comprising the following elements: a lower plate, the middle part of the lower plate is connected to the upper plate through a vertical central column, the upper plate is parallel to the lower plate. A group of vertical plates is located between the upper and lower plates and includes two vertical plates arranged symmetrically along the central axis of the central column. The side surface of the vertical plate is provided with a positioning-clamping mechanism for fastening the track link, and the vertical plate is mounted on the machined lower surface of the track link. The seat is provided with a hole on the reverse side [CN 217727988 U, publication date 04.11.2022].

[0013] The disadvantage of the clamp is that there is no hydraulic clamp control system, which negatively affects the ability to clamp the workpiece with the required force, thereby reducing the reliability of fixing the workpiece and the accuracy of positioning the workpiece relative to the processing tools, which can affect the quality of the resulting part, and it also takes a significant amount of time to install and remove the workpieces.

[0014] A multi-process and multi-position hydraulic clamping device for a horizontal machining center for machining a steering knuckle of a vehicle's steering axle is known, including a fixed frame, a mounting device and a fastening device, the fixed frame including a base, a lower plate, a rear fastening plate, an upper plate and an intermediate assembly device, provided with a plurality of sets of fastening devices [CN 109262319 B, publication date 02.27.2024].

[0015] The disadvantage of the known hydraulic clamp is that the design and shape of the clamping devices do not allow for the fixation of workpieces to obtain a track bracket. DISCLOSURE OF THE ESSENCE OF THE INVENTION

[0016] The technical problem that the claimed invention is aimed at solving consists of creating a method for mechanically processing a workpiece for manufacturing a track bracket on a horizontal milling machining center with two rotary tables and one spindle using two multi-seat hydraulic clamps designed to install and fix a set of eight track bracket workpieces.

[0017] The technical result achieved by implementing the claimed invention consists in increasing the productivity of mechanical processing of workpieces for producing a track bracket on a horizontal milling machining center containing two rotary work tables and one spindle, due to the processing of a set of eight workpieces in one technological cycle.

[0018] The technical result is achieved due to the fact that the method for mechanical processing of a track bracket is characterized by the fact that i) the mechanical processing of the workpieces of the track bracket is carried out on a horizontal milling machining center (1) with two rotary work tables (1.1) and one spindle (1.2); ii) the first and second multi-seat hydraulic clamps are used, having different configurations of clamping devices, each of which is installed on its own rotary work table (1.1) and the coordinate systems are set along the axes X, Y, Z; iii) the spindle (1.2) a set of cutting tools, the distance along the Z axis is measured for each tool and entered into the numerical control unit; iv) a set of workpieces (27) of the track bracket is installed in the first multi-position hydraulic clamp and the workpieces are mechanically processed with a set of cutting tools in accordance with the first control program of the numerical control, wherein during the processing the multi-position clamp is rotated by 90° relative to the spindle (1.2); v) the processed workpieces (27) are removed from the first multi-position hydraulic clamp, installed in the second multi-position hydraulic clamp and the workpieces (27) are mechanically processed with a set of cutting tools in accordance with the second control program of the numerical control, wherein during the processing the multi-position clamp is rotated by 90° relative to the spindle (1.2);vi) the processed blanks (27) are removed from the second multi-seat hydraulic clamp;vii) the first multi-seat hydraulic clamp is a column (1.3) made in the form of a vertically oriented parallelepiped mounted on a support plate (1.4), equipped with a hydraulic system including a central hydraulic distributor (14) mounted on the upper wall of the column (1.3) and sixteen hydraulic cylinders (15) located inside the column (1.3) and hydraulically connected to the central hydraulic distributor (14), wherein on each of the vertical walls of the column (1.3) two support platforms (2) are installed, on each of which a set of clamping devices is placed, intended for installing and fixing the workpieces of the parts, wherein each set of clamping devices includes: the upper (7) and lower (8) installation stops, placed on the support platform (2) and intended for installing and centering the workpiece of the part; the upper (3) and lower (4) vertically oriented clamps, connected to their hydraulic cylinder (15) by means of a spring-loaded rod (11) in such a way as to ensure the clamping of the workpiece installed on the installation stops (7) and (8); a spring-loaded stop pin (9), installed on the support platform (2) with the possibility of fixing the workpiece, placed between the upper (3) and lower (4) clamps, from horizontal movement; the second multi-seat hydraulic clamp is a column (1.3), made in the form of a vertically oriented parallelepiped, installed on basis (1.4), equipped with a hydraulic system including a central hydraulic distributor (14) mounted on the upper wall of the column (1.3) and eight hydraulic cylinders (15) hydraulically connected to it, wherein on each of the vertical walls of the column (1.3) two sets of clamping devices are installed, intended for installing and fixing blanks (27) of parts, wherein each set of clamping devices includes: a lower support plate (28), on which lower supports (29) are installed for placing the workpiece, between which two spring-loaded rods (30) are placed; two installation stops (32) secured to the walls of the column (1.3) in the workpiece installation area (27); a hydraulic cylinder (15) mounted on the upper support plate (33) located between two spacers - left (34) and right (35) parallel to the lower support plate (28), while in the lower part of the spacers guides (36) are installed, in which an upper clamp (37) is installed with the possibility of vertical movement and connected to the hydraulic cylinder (15) by means of a thrust shoe (38);

[0019] In addition, in a particular case of the invention, the hydraulic cylinders (15) of the first multi-seat clamp are attached to the inner side of the wall of the column (1.3) using a clamp (17).

[0020] In addition, in a particular case of implementing the invention, the spring-loaded rod (11) of the first multi-seat clamp is installed in the housing (18), secured to the support platform (2), through the sleeve (19) with the retaining ring (20).

[0021] In addition, in a particular case of the invention, the first multi-seat clamp contains thrust bearings (5) made in the form of a horizontally elongated parallelepiped, installed at an angle of 90° to the upper (3) and lower (4) clamps, while a longitudinal groove is made on the surface of the thrust bearing, into which a guide (6) in the form of a cylindrical rod is installed, which is the axis of rotation of the clamps (3) and (4).

[0022] In addition, in a particular case of the invention, the spring-loaded rod (11) of the first multi-seat clamp is fixed in the clamps (3, 4) using fastening elements in the form of a nut and a washer through a semicircular shoe (22).

[0023] In addition, in a particular case of the invention, the first and second multi-seat clamps are provided with a centering cup (23) installed in the lower part of the support plate of the column (1.3).

[0024] In addition, in a particular case of implementing the invention, the first and second multi-seat clamps are provided with eyebolts (24) installed on the upper wall (16) of the column (1.3).

[0025] In addition, in a particular case of implementing the invention, the first and second multi-seat clamps are provided with handles (25) located on each vertical wall of the column (1).

[0026] In addition, in a particular case of the invention, the installation stops (32) of the second multi-seat clamp are made in the form of cylinders with tips that are fixed to the walls of the column (1.3) through an adjusting gasket (40).

[0027] In addition, in a particular case of the invention, the jaws of the lower support (3) of the second multi-seat clamp are installed on the lower support plate (28) through the adjusting linings (41).

[0028] In addition, in a particular case of implementing the invention, the upper clamp (37) of the second multi-seat clamp is provided with removable jaws (39).

[0029] In addition, in a particular case of the invention, the hydraulic cylinder (15) of the second multi-seat clamp is mounted on the upper support plate (33) through the compensation nut (42).

[0030] The use of two multi-position hydraulic clamps with different clamping configurations enables simultaneous machining of various surfaces of a track bracket workpiece set, increasing part productivity by reducing workpiece installation / removal time. The hydraulic clamp design ensures highly accurate positioning of the track bracket workpieces relative to the cutting tool and secure clamping with the required force, improving the quality of the resulting parts. BRIEF DESCRIPTION OF DRAWINGS

[0031] The implementation of the utility model is confirmed by the drawings, which show: Fig. 1 - a top view of a horizontal milling machining center with a first multi-station clamp; Fig. 2 - an enlarged view A in Fig. 1; Fig. 3 - a top view of a horizontal milling machining center with a second multi-station clamp; Fig. 4 - enlarged view B in Fig. 3; Fig. 5 - general view of the first multi-station clamp of the horizontal milling machining center; Fig. 6 - front view of the first multi-station clamp of the horizontal milling machining center; Fig. 7 - sectional view B-B in Fig. 6; Fig. 8 - sectional view D-D in Fig. 6; Fig. 9 - sectional view G-G in Fig. 6; Fig. 10 - sectional view D-D in Fig. 6; Fig. 11 - enlarged view G in Fig. 8; Fig. 12 - enlarged view of the installed workpiece; Fig. 13 - sectional view EE in Fig. 12; Fig. 14 - hydraulic diagram of the first multi-station clamp; Fig. 15 - general view of the second multi-station clamp of the horizontal milling machining center; Fig.16 - general front view of the second multi-seat clamp of the horizontal milling machining center; Fig. 17 - section view B-B in Fig. 16; Fig. 18 - enlarged front view; Fig. 19 - enlarged side view; Fig. 20 - section view E-E in Fig. 19; Fig. 21 - hydraulic diagram of the second multi-seat clamp.

[0032] In the drawings, the positions have the following designations: 1 - horizontal milling machining center; 1.1 - rotary work table; 1.2 - spindle; first hydraulic clamp: 1.3 - cast column; 1.4 - column support plate; 2 - support platform; 3 - upper clamp; 4 - lower clamp; 5 - clamp thrust pad; 6 - clamp guide; 7 - upper installation stop; 8 - lower installation stop; 9 - thrust pin; 10 - thrust pin console; 11 - clamp rod; 12 - rod spring; 13 - adjusting washer; 14 - central hydraulic distributor; 15 - hydraulic cylinder; 16 - column upper wall; 17 - hydraulic cylinder clamp; 18 - guide housing; 19 - bushing; 20 - retaining ring; 21 - wiper; 22 - semicircular shoe; 23 - centering cup; 24 - eye bolt; 25 - handle; 26 - guide bracket; 27 - workpiece - track bracket; second hydraulic clamp: 1.3 - cast column; 1.4 - column support plate; 28 - lower support plate; 29 - lower supports; 30 - support rod; 31 - rod spring; 32 - installation stops; 15 - hydraulic cylinder; 33 - upper support plate; 34, 35 - side struts; 36 - guides; 37 - upper clamp; 38 - thrust shoe; 39 - removable jaws of the upper clamp; 40 - adjusting lining; 41 - adjusting lining; 42 - compensation nut; 43 - lock plate; 19 - central hydraulic distributor; 20 - upper wall of the column; 23 - centering cup; 24 - eye bolt; 25 - handle; 27 - blank of the part - track bracket. IMPLEMENTATION OF THE INVENTION.

[0033] The implementation of the invention is confirmed by the example below with reference to the drawings.

[0034] The invention can find application in organizing the technological process of mechanical processing of blanks for the production of a track bracket on a horizontal milling machining center 1 (Fig. 1), for example, the HMC-500P model with two rotary work tables and one spindle [https: / / www.sinocncmachine.com / pid18291387 / HMC500P-horizontal-machining-center.htm; https: / / www.in-core.ru / product / oborudovanie / frezernoe-oborudovanie / gorizontalnye / gorizontalnyy-frezernyy-obrabatyvayushchiy-tsentr-hmc-500 / #desc].

[0035] The first and second multi-seat hydraulic clamps with different configurations of clamping devices are used as clamps for the workpieces of the track clamps, which allow for the mechanical processing of a set of eight workpieces of the track clamp on one machine in one technological cycle at the same time with a different set of cutting tools.

[0036] The first multi-seat clamp is a column 1.3, made in the form of a vertically oriented parallelepiped, installed on a rectangular support plate 1.4 (Fig. 5, 6).

[0037] The first multi-clamp allows for the simultaneous mounting of eight (8) workpieces 27 for machining individual surfaces to produce track clamps. Further in the text, as evidence of the implementation of the utility model, the execution of one set of clamping devices will be described in detail; the remaining seven (7) sets of clamping devices are constructed identically.

[0038] On each of the vertical walls of column 1.3, two support platforms 2 are installed, on which a set of clamping devices is secured, designed for installing and fixing blanks 27 parts for subsequent processing on a horizontal milling machining center (not shown in the drawings). Support platforms 2 are made in the form of vertically oriented rectangular metal plates, secured to the wall of column 1.1 one above the other (Figs. 5, 6).

[0039] The clamping device includes an upper 3 and lower 4 vertically oriented clamps, a thrust bearing 5 forming an angle of 90° with the clamp, a guide 6 made in the form of a cylindrical rod installed in the thrust bearing 5 and the clamp and being the axis of rotation of the clamp, upper 7 and lower 8 installation stops intended for installing and centering the workpiece, a stop pin 9 installed in the console, a clamp rod 11 spring-loaded by a spring 12 with an adjusting washer 13 (Fig. 8, 10).

[0040] Column 1.3 is equipped with a hydraulic system including a central hydraulic distributor 14 mounted on the upper wall 16 of the column and eight hydraulic cylinders 15 located inside the column 1 and hydraulically connected to the central hydraulic distributor 14 (Fig. 14). Each hydraulic cylinder 15 is connected to the clamp 3 and 4 by means of a spring-loaded rod 11. The hydraulic cylinders 15 are attached to the inner side of the wall of the column 1 by means of a clamp 18. The rod 11 is installed in the housing 18, fixed on the support platform 2, through the bushing 19 with a retaining ring 20 and a wiper 21 (Fig. 11).

[0041] The rod 11 is fixed in the clamp 12 and 13 using fastening elements in the form of a nut and a washer through a semicircular shoe 22 (Fig. 8).

[0042] At the bottom of the base of column 1.3, a centering cup 23 is installed, designed for precise positioning of the column on the working table of the horizontal milling machine (Fig. 5).

[0043] Also on the upper wall 16 of column 1.3, two eyebolts 24 are installed, designed for transferring columns from one machine to another.

[0044] On each vertical wall of column 1, handles 25 are installed, designed for carrying the column.

[0045] The second multi-position clamp of the horizontal milling machining center for fastening workpieces, for example, workpieces of a track bracket (Fig. 1, 2) is a column 1.3, made in the form of a vertically oriented parallelepiped, mounted on a support plate 1.4 of a rectangular shape (Fig. 15, 16).

[0046] On each of the vertical walls of column 1.3 there are two sets of clamping devices designed for installing and fixing blanks of parts for subsequent processing on a horizontal milling machining center (not shown in the drawings).

[0047] The second multi-position hydraulic clamp enables the simultaneous installation of eight (8) blanks of 27 track bracket components. Further, to support the invention, the design of one set of clamping devices will be described in detail; the remaining seven (7) sets of clamping devices are identically constructed.

[0048] The clamping device includes a lower support plate 28, on which lower supports 29 are installed for placing the workpiece, two rods 30, spring-loaded by a spring 31, installed in the lower support plate 28 between the lower supports 29, two installation stops 32 installed in the area of ​​​​installing the workpiece 27, a hydraulic cylinder 15 installed on the upper support plate 33, located between two spacers - left 34 and right 35, in the lower part of which guides 36 are placed, in which the upper clamp 37 is installed, connected to the hydraulic cylinder 15 by means of a stop shoe 38 (Fig. 15, 16).

[0049] The upper clamp 37 is provided with removable jaws 39 to prevent mechanical damage to the workpiece 27 during its clamping. The installation stops 32 are made in the form of cylinders with tips for controlling the position of the workpiece and are fixed on the walls of the column 1.3 through the adjusting linings 40 in the area of ​​​​installing the workpiece 27. The lower supports 29 are mounted on the lower support plate 28 through the adjusting linings 41. The hydraulic cylinder 15 is mounted on the upper support plate 33 through the compensation nut 42. In the central part of the lower support plate 28, a locking plate 43 is located (Fig. 18, 19).

[0050] Column 1.3 is equipped with a hydraulic system, including a central hydraulic distributor 14, installed on the upper wall 16 of column 1.3, and eight hydraulic cylinders 15, hydraulically connected to the central hydraulic distributor 14.

[0051] At the bottom of the support plate 1.4 of the column 1.3, a centering cup 23 is installed, designed for precise positioning of the column 1.3 on the working table 1.1 of the horizontal milling machining center 1.

[0052] Also on the upper wall 20 of column 1.3, two eye bolts 24 are installed, designed for transferring columns from one machine to another.

[0053] On each vertical wall of column 1.3, handles 25 are installed, designed for moving the column. The method of mechanical processing of blanks for the track bracket is carried out as follows.

[0054] The first multi-position clamp is installed on worktable 1.1 of horizontal milling machining center 1, centered using centering cup 23, and secured with detachable connections. Connect central hydraulic distributor 14 to the hydraulic system (not shown in the drawings) of horizontal milling machining center 1.

[0055] Eight blanks of 27 track brackets are installed in the first multi-clamp. A set of cutting tools (twelve tools) is installed in spindle 1.2 of horizontal milling machining center 1, the distance along the Z axis is measured, and the parameters are entered into the numerical control unit. The coordinate systems for the X, Y, and Z axes are set on the first and second hydraulic clamps.

[0056] Before installing the workpieces 27, it is necessary to make sure that the hydraulic cylinders 15 are released, due to which the clamps 3 and 4 can be freely moved to the side in order to move the workpiece onto the installation stops 7 and 8. When installing the workpiece 27, it is necessary to make sure that there are no chips or other foreign objects on the installation stops 7 and 8 that prevent the installation of the workpiece.

[0057] Next, depress stop pin 9 and place the workpiece on stops 7 and 8, perform the necessary centering and positioning, and then release stop pin 9, which secures the workpiece from horizontal movement. Then, set clamps 3 and 4 to the vertical position (Figs. 8, 9).

[0058] After installing clamps 3 and 4, press the button, which is part of the hydraulic system of horizontal milling machine 1. It controls the supply of hydraulic fluid to central hydraulic distributor 14, which then distributes the hydraulic fluid to hydraulic cylinders 15 of column 1. Hydraulic cylinders 15, via spring-loaded rod 11, transmit force to clamps 3 and 4, which clamp workpieces 27 with the required force. It is necessary to ensure that workpieces 27 are securely fixed and that their position is not disturbed during clamping. Also, when clamping a workpiece, it is necessary to prevent foreign objects from entering the contact zone between clamps 3 and 4 and the workpiece.

[0059] After workpieces 27 are clamped, they are machined using twelve cutting tools pre-positioned in spindle 1.2 of the horizontal milling machining center in accordance with the first numerical control program. During machining, two workpieces 27 are machined on each side of the multi-clamp by rotating the worktable, on which it is mounted, by 90° relative to spindle 1.2.

[0060] During the mechanical processing of workpiece 27, the following operations are performed in accordance with the control program algorithm: - facing of a 117×56 mm plane; - preliminary drilling (D28) for D30 holes; - chamfering 1×45 for D30 holes; - boring holes to D30; - black milling of a 12 mm groove to a depth of 32 mm; - finishing milling of a 12 mm groove to a depth of 30 mm;

[0061] After finishing the processing, the processed workpieces 27 are removed from the first multi-clamp in the reverse order.

[0062] After removing the blanks 27, they are moved to the second multi-position clamp, where they are mechanically processed with a set of cutting tools (eleven tools), previously set in the spindle 1.2 of the horizontal milling machining center 1, in accordance with the second control program of the numerical control. In the process of mechanical processing of workpiece 27 in accordance with the algorithm of the control program the following operations are performed: - drilling D40; - chamfering 1×45 for hole D30; - rough milling of 12 mm groove to a depth of 27 mm; - finish milling of 12 mm groove to a depth of 30 mm; - drilling D21; - chamfering 1.6×45 for hole D21; - finishing the bottom of hole D40 by milling + boring of hole D21; - drilling D18.5 for thread M20×1.5; - chamfering for hole D18.5; - cutting thread M20×1.5; - removing the back chamfer for hole M20×1.15;

[0063] Before installing the workpieces 27 into the second multi-clamp, it is necessary to make sure that the hydraulic cylinders 15 are released, the upper clamp 37 is raised upward in such a way as to ensure the ability to freely insert the workpiece 37 of the track bracket and install it into the lower supports 29, while it is necessary to make sure that there are no chips or other foreign objects on the lower supports 29 that would prevent the installation of the workpiece (Fig. 18, 19, 20).

[0064] Next, the workpiece 27 of the track bracket is installed on the lower supports 29 and spring-loaded rods 30, the necessary centering and positioning of the workpiece is carried out, while the rear surface of the workpiece 27 must be in contact with the tips of the installation stops 32, which prevents the workpiece from moving in the horizontal plane (Fig. 19).

[0065] After installing the workpiece 27 of the track bracket in the specified position on the lower supports 29, it is necessary to press the button, which is part of the hydraulic system of the horizontal milling machine 1, controlling the supply of hydraulic fluid to the central hydraulic distributor 14, which supplies hydraulic fluid to the hydraulic cylinders 15 of the column 1.3. The hydraulic cylinders 15, through the thrust shoe 38, transmit the hydraulic force to the upper clamp 37, which, moving downwards along the guides 36, will press the workpieces 27 of the part to the lower supports 29 with the required force. In this case, it is necessary to make sure that all the workpieces 27 are securely fixed, and that the position of the workpieces is not disturbed during the pressing process. Also, when clamping workpieces 27, it is necessary to prevent foreign objects from entering the area of ​​their contact with the upper clamp (Fig. 18, 19, 20).

[0066] After finishing the processing, remove the processed workpieces 27 from the second multi-clamp in the reverse order.

[0068] After this, the processing of workpieces 27 is prepared in the first multi-position clamp and then a continuous process of mechanical processing of sets of workpieces is carried out with a stop for removing the processed parts from the first multi-position clamp and reinstalling them on the second multi-position clamp.

[0069] This ensures an increase in the productivity of mechanical processing of workpieces for producing track brackets on a horizontal milling machining center with two tables and one spindle due to the use of two multi-position clamps, which allow for the processing of a set of workpieces in one technological cycle and ensures high-precision positioning of workpieces for producing track links relative to the cutting tool, reliable fixation of workpieces with the required force, which improves the quality of the resulting parts, and also reduces the time for installing / removing the workpiece.

Claims

1. A method for mechanical processing of a track bracket, characterized in that mechanical processing of the workpiece (27) of the track bracket is carried out on a horizontal milling machining center (1) with two rotary work tables (1.1) and one spindle (1.2), while use the first and second multi-seat hydraulic clamps, which have different configurations of clamping devices, each of which is installed on its own rotary work table (1.1) and set the coordinate systems along the X, Y, Z axes of the horizontal milling machining center; a set of cutting tools is installed in the spindle (1.2), the distance along the Z axis is measured for each tool and entered into the numerical control unit; a set of workpieces (27) for the track bracket are installed in the first multi-seat hydraulic clamp and they are mechanically processed using a set of cutting tools in accordance with the first numerical control program, while during the processing the multi-seat clamp is rotated by 90° relative to the spindle (1.2); the processed workpieces (27) are removed from the first multi-seat hydraulic clamp, installed in the second multi-seat hydraulic clamp and mechanical processing of the workpieces (27) is carried out with a set of cutting tools in accordance with the second control program of the numerical control, while during the processing the multi-seat clamp is rotated by 90° relative to the spindle (1.2); remove the processed workpieces (27) from the second multi-seat hydraulic clamp; wherein the first multi-seat hydraulic clamp is a column (1.3) made in the form of a vertically oriented parallelepiped mounted on a support plate (1.4), equipped with a hydraulic system including a central hydraulic distributor (14) mounted on the upper wall of the column (1.3) and sixteen hydraulic cylinders (15) located inside the column (1.3) and hydraulically connected to the central hydraulic distributor (14), wherein on each of the vertical walls of the column (1.3) two support platforms (2) are installed, on each of which a set of clamping devices is placed, intended for installing and fixing the blanks (27) of the track bracket, wherein each set of clamping devices contains: upper (7) and lower (8) installation stops located on the support platform (2) and designed for installing and centering the workpiece (27) of the track bracket; upper (3) and lower (4) vertically oriented clamps connected to their hydraulic cylinder (15) by means of a spring-loaded rod (11) to ensure the clamping of the workpiece (27) of the track bracket installed on the installation stops (7) and (8); a spring-loaded stop pin (9) mounted on a support platform (2) with the ability to fix the workpiece (27) of the track bracket, located between the upper (3) and lower (4) clamps, from its horizontal movement; and the second multi-seat hydraulic clamp is a column (1.3) made in the form of a vertically oriented parallelepiped mounted on a base (1.4) and equipped with a hydraulic system including a central hydraulic distributor (14) mounted on the upper wall of the column (1.3) and eight hydraulic cylinders (15) hydraulically connected to it, wherein on each of the vertical walls of the column (1.3) two sets of clamping devices are installed, intended for installing and fixing the workpieces (27) of the track bracket, wherein each set of clamping devices contains: a lower support plate (28), on which lower supports (29) are installed for placing the workpiece (27) of the track bracket, between which two spring-loaded rods (30) are placed; two installation stops (32) secured to the walls of the column (1.3) in the area of ​​installation of the workpiece (27) of the track bracket; a hydraulic cylinder (15) connected to the hydraulic cylinder (15) by means of a thrust shoe (38) and mounted on the upper support plate (33) located between two left (34) and right (35) spacers parallel to the lower support plate (28), wherein guides (36) are secured in the lower part of said spacers, in which the upper clamp (37) is mounted with the possibility of vertical movement.

2. The method according to paragraph 1, characterized in that the hydraulic cylinders (15) of the first multi-seat clamp are attached to the inner side of the wall of the column (1) by means of a clamp (17).

3. The method according to paragraph 1, characterized in that the spring-loaded rod (11) of the first multi-seat clamp is installed in the housing (18), secured to the support platform (2), through the sleeve (19) with the retaining ring (20).

4. The method according to claim 1, characterized in that the first multi-seat clamp contains thrust bearings (5) made in the form of a horizontally elongated parallelepiped and installed at an angle of 90° to the upper (3) and lower (4) clamps, while a longitudinal groove is made on the surface of the thrust bearing, into which a guide (6) in the form of a cylindrical rod is installed, which is the axis of rotation of the clamps (3) and (4).

5. The method according to paragraph 1, characterized in that the spring-loaded rod (11) of the first multi-seat clamp is fixed in the clamps (3, 4) by means of fastening elements in the form of a nut and a washer through a semicircular shoe (22).

6. The method according to paragraph 1, characterized in that the first and second multi-seat clamps are equipped with a centering cup (23) installed in the lower part of the support plate of the column (1).

7. The method according to claim 1, characterized in that the first and second multi-seat clamps are equipped with eyebolts (24) installed on the upper wall (16) of the column (1.3).

8. The method according to claim 1, characterized in that the first and second multi-position clamps are equipped with handles (25) located on each vertical wall of the column (1.3).

9. The method according to paragraph 1, characterized in that the installation stops (32) of the second multi-seat clamp are made in the form of cylinders with tips that are secured to the walls of the column (1.3) through an adjusting gasket (40).

10. The method according to claim 1, characterized in that the jaws of the lower support (29) of the second multi-seat clamp are installed on the lower support plate (28) through adjusting linings (41).

11. The method according to claim 1, characterized in that the upper clamp (37) of the second multi-seat clamp is provided with removable jaws (39).

12. The method according to paragraph 1, characterized in that the hydraulic cylinder (15) of the second multi-seat clamp is installed on the upper support plate (33) through a compensation nut (42).

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