CN112743132A

CN112743132A - Multi-surface synchronous milling method and equipment for rectangular rack

Info

Publication number: CN112743132A
Application number: CN202011603237.0A
Authority: CN
Inventors: 聂俊; 聂荣辉
Original assignee: Miluo Xingtian Machinery Co ltd
Current assignee: Miluo Xingtian Machinery Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-04

Abstract

The invention discloses a multi-surface synchronous milling method and equipment for a rectangular frame, which comprises the following steps: a work table; a positioning mechanism comprising: a first positioning block, a second positioning block A, B, a third positioning block and a fourth positioning block; the third positioning block and the fourth positioning block are driven by the ejection mechanism, and when the third positioning block and the fourth positioning block move outwards, the third positioning block and the fourth positioning block tightly push the inner side edge of the rectangle with the first positioning block and the second positioning block A, B; clamping mechanism sets up in the rectangle frame and is close to each limit intersection inboard, includes: the device comprises a pressure plate and a telescopic cylinder, wherein one end of the telescopic cylinder is connected to a workbench, and the other end of the telescopic cylinder is connected to the pressure plate; one end of the pressure plate is hinged on the workbench in a rotating way around the horizontal shaft, and the other end of the pressure plate is pressed on the upper end of the rectangular rack when retracting through the telescopic cylinder; and four milling devices are arranged and are respectively arranged on the workbench in a moving mode along the length extending direction of each side of the rectangular rack. The invention aims to quickly position and clamp a rectangular frame type frame so as to synchronously mill each vertical face of the rectangular frame.

Description

Multi-surface synchronous milling method and equipment for rectangular rack

Technical Field

The invention relates to the technical field of milling clamps, in particular to a multi-surface synchronous milling method and equipment for a rectangular rack.

Background

The existing machine frame for a certain machine needs to be processed, the general appearance of the existing machine frame is a rectangular frame type structure, the surfaces at four corners of the existing machine frame need to be processed by face milling, drilling and the like, due to the structural particularity, the existing positioning, clamping and the like are fixed by hands before processing by using simple positioning blocks, clamping blocks and the like, and on one hand, due to the fact that the existing machine frame is heavy, the existing machine frame is not easy to adjust during operation; on the other hand, the clamping efficiency is low, so that a special milling device is needed to be designed for processing the product in order to facilitate operation, reduce the working strength, improve the production efficiency and the like.

Disclosure of Invention

In view of the above, the present invention provides a method and an apparatus for multi-surface synchronous milling of a rectangular frame, so that a rectangular frame-shaped frame can be quickly positioned and clamped, and then a corner vertical surface of the rectangular frame can be synchronously milled, thereby reducing working strength and improving processing efficiency.

In order to achieve the above object, in a first aspect, the present invention provides a method and an apparatus for multi-surface synchronous milling of a rectangular frame, including:

the workbench is used for horizontally placing the rectangular rack;

a positioning mechanism comprising at least: the positioning device comprises a first positioning block, a second positioning block, a third positioning block and a fourth positioning block, wherein the first positioning block is fixedly arranged on the workbench and abuts against the inner side of a first short edge of the rectangular rack; the third positioning block and the fourth positioning block are driven by an ejection mechanism;

clamping mechanism sets up in the rectangle frame and is close to each limit intersection inboard, includes: the device comprises a pressure plate and a telescopic cylinder, wherein one end of the telescopic cylinder is connected to a workbench, and the other end of the telescopic cylinder is connected to the pressure plate; one end of the pressing plate is hinged to the workbench in a rotating mode around the horizontal shaft, and the other end of the pressing plate is pressed to the upper end of the rectangular rack when retracting through the telescopic cylinder;

and four milling devices are arranged, and are respectively arranged on the workbench in a moving mode along the length extension direction of each side of the rectangular rack and used for milling the outer vertical surfaces of each side of the rectangular rack.

Further, the ejection mechanism includes: the telescopic rod is hinged to one end of the third connecting rod and one end of the fourth connecting rod, the other end of the third connecting rod is hinged to the third positioning block, and correspondingly, the other end of the fourth connecting rod is hinged to the fourth positioning block.

Furthermore, a guide inclined plane which is close to the rectangular edge from top to bottom is arranged on one side, close to the rectangular edge, of each positioning block.

Further, the first positioning block is arranged at the middle point on the inner side of the first short side close to the rectangular rack, the second positioning block A and the second positioning block B are respectively arranged at the two ends on the inner side of the second long side close to the rectangular rack, the third positioning block is arranged at the middle point on the inner side of the third short side close to the rectangular rack, and the fourth positioning block is arranged at the middle point on the inner side of the fourth long side close to the rectangular rack.

The milling device includes: a body;

the first mandrel is rotatably arranged on the body around the axis of the first mandrel, and a first face milling cutter disc is coaxially arranged at the end part of the first mandrel;

the second mandrel is rotatably arranged on the body around the axis of the second mandrel, and the axis of the second mandrel is parallel to the first mandrel; a second face milling cutter disc is coaxially arranged at the end part of the second mandrel, and the milling surfaces of the second face milling cutter disc and the first face milling cutter disc are in the same plane; the rotation axes of the first face milling cutter disc and the second face milling cutter disc are arranged in a front-back staggered mode along the milling feed direction, and the milling processing areas of the first face milling cutter disc and the second face milling cutter disc are partially overlapped; and the first mandrel and the second mandrel are in transmission connection with a rotary drive.

Further, first dabber, the equal coaxial reference column that sets up of second dabber tip, correspondingly, the equal coaxial matched with location counter bore that sets up in one side that deviates from the milling process face on first face milling cutter dish, the second face milling cutter dish, the reference column and location counter bore tight fit.

Furthermore, the positioning column is provided with a limiting block along the radial direction, correspondingly, one side of the milling cutter disc, which deviates from the milling surface, is provided with a matched limiting groove, and the side surface of the limiting block is matched with the limiting groove to transmit torque.

Furthermore, the end, close to the positioning column, of the mandrel is also provided with a large positioning plane perpendicular to the axis, the end face of the limiting block abuts against the large positioning plane and is locked by a first bolt penetrating through the limiting block to the large positioning plane, and the axis of the first bolt is parallel to the axis of the mandrel.

Furthermore, one end of the mandrel, which is close to the positioning column, is also provided with a large positioning plane perpendicular to the axis and a second limiting groove formed along the radial direction, the second limiting groove penetrates through the large positioning plane, when the limiting groove is aligned with the second limiting groove, two end faces of the limiting block are respectively matched with the limiting groove and the second limiting groove and are radially inserted into the limiting groove, and the limiting block is locked by a second bolt penetrating through the limiting block to the positioning column.

Further, still include: the third dabber rotates install in on the body, the axis is parallel with first dabber, second dabber, and third dabber tip coaxial arrangement has third facing cutter dish, and third facing cutter dish and first facing cutter dish, second facing cutter dish milling process face are in the coplanar, and dislocation set around third facing cutter dish and first facing cutter dish axis of rotation are along milling the feed direction, and the regional part of milling process of third facing cutter dish and first facing cutter dish overlaps.

Furthermore, a driving wheel is coaxially arranged at the other end of the first mandrel, and the second mandrel is in transmission fit connection with the first mandrel through a gear set.

Furthermore, a driving wheel is coaxially arranged at the other end of the first mandrel, and the second mandrel, the third mandrel and the first mandrel are in transmission fit connection through a gear set.

Further, still include: the slide carriage is movably erected on a guide rail arranged along the length moving direction of each side of the rectangular rack, and the milling device is arranged on the slide carriage in a sliding mode along the direction perpendicular to the vertical face of each side of the rectangular rack.

The processing method of the multi-surface synchronous milling processing equipment utilizing the rectangular frame comprises the following steps:

s1, workpiece clamping: hoisting the rectangular frame to a workbench through hoisting equipment, and positioning and pressing through a positioning mechanism and a clamping mechanism;

s2, synchronous milling: the four milling devices simultaneously mill the outer vertical surfaces of all sides of the rectangular rack and simultaneously move in a square loop along the counterclockwise direction so as to mill the four vertical surfaces;

s3, removing the workpiece: the positioning mechanism and the clamping mechanism loosen the workpiece, the workpiece is lifted away through the lifting equipment, and the milling device returns to the initial position to prepare for next milling of the workpiece.

Compared with the prior art, the invention has the beneficial effects that: the rectangular frame type frame can be quickly positioned and clamped, and then the vertical faces at the corners of the rectangular frame are subjected to synchronous milling, so that the working strength is reduced, and the processing efficiency is improved.

When the telescopic rod is pushed outwards, the third connecting rod and the fourth connecting rod are pushed to further push the third positioning block and the fourth positioning block to expand outwards to move to tightly push the rectangular rack, so that the pushing is realized, and the pushing force and the position are better in self-adaptive adjustment when the telescopic rod is pushed relative to a single cylinder.

When the workpiece moves relative to the feed direction, a wider range can be processed by one-time feed of two or more face milling cutter discs, the feed times are reduced, meanwhile, the diameter of each face milling cutter disc can be selected moderately, and the rigidity of the face milling cutter disc is ensured relative to a large-diameter cutter disc.

Drawings

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

FIG. 1 is a schematic top view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A1-A1 of FIG. 1;

FIG. 3 is a schematic front view of the milling device shown in FIG. 1 according to the present invention;

FIG. 4 is a schematic left side view of the structure of FIG. 3 according to the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at B1;

FIG. 6 is a schematic view of the structure of FIG. 5B 2;

FIG. 7 is a schematic view of another mounting structure of the limiting block shown in FIG. 5 according to the present invention;

FIG. 8 is a schematic view of the structure of FIG. 7 from B3;

fig. 9 is a partial enlarged view of the structure at C in fig. 2 according to the present invention.

In the figure: 11. a positioning mechanism; 111. a first positioning block; 112a and a second positioning block A; 112B and a second positioning block B; 113. a third positioning block; 114. a fourth positioning block; 115. a guide slope; 12. a clamping mechanism; 121. pressing a plate; 122. A telescopic cylinder; 13. a third link; 14. a fourth link; 15. a telescopic rod; 2. a milling device; 21. a first mandrel; 211. a first face milling cutter disc; 22. a second mandrel; 221. a second face milling cutter disc; 23. a third mandrel; 231. a third face milling cutter disc; 24. a driving wheel; 25. a gear set; 201. a positioning column; 202. positioning the counter bore; 203. a limiting block; 204. a limiting groove; 205. a large positioning plane; 206. a first bolt; 207. a second limit groove; 208. a second bolt; 3. a slide carriage; 4. a guide rail; 41. a guide rail groove; 5. a first lead screw assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 9, an embodiment of the present invention provides a method and an apparatus for multi-surface synchronous milling of a rectangular frame, including:

the workbench is used for horizontally placing the rectangular rack; the rectangular frame comprises a first short-side frame, a third short-side frame, a second long-side frame and a fourth long-side frame, wherein as shown by a dotted line part in the figure, the vertical surfaces at four corners need to be processed;

the positioning mechanism 11 includes at least: a first positioning block 111 which is fixedly arranged on the workbench and tightly abuts against the inner side of the first short side of the rectangular rack, a second positioning block A112a and a second positioning block B112B which are fixedly arranged on the workbench and tightly abut against the inner side of the second long side of the rectangular rack at intervals, a third positioning block 113 which is arranged on the workbench and moves from inside to outside along the direction of the long side of the rectangle and is used for tightly abutting against the inner side of the third short side of the rectangular rack, and a fourth positioning block 114 which is arranged on the workbench and moves from inside to outside along the direction of the short side of the rectangle and is used for tightly abutting against the inner side; the third positioning block 113 and the fourth positioning block 114 are driven by an ejection mechanism; the positioning block is provided with a long slotted hole along the direction vertical to the vertical surface of each side of the rectangle, so that the positioning block can be conveniently adjusted correspondingly when being installed through a bolt;

clamping mechanism 12, set up in the rectangle frame and be close to each limit intersection inboard, include: the device comprises a pressure plate 121 and a telescopic cylinder 122, wherein one end of the telescopic cylinder 122 is connected to a workbench, and the other end of the telescopic cylinder is connected to the pressure plate 121; one end of the pressure plate 121 is hinged to the workbench in a rotating mode around a horizontal shaft, and the other end of the pressure plate is pressed to the upper end of the rectangular rack when retracting through the telescopic cylinder 122;

the four milling devices 2 are respectively arranged on the workbench in a moving mode along the length extension direction of each side of the rectangular rack and used for milling the outer vertical face of each side of the rectangular rack.

Specifically, the rectangular frame is lifted above the workbench through a lifting device, is placed downwards to a processing station, moves leftwards in the figure through a fourth positioning block 114, realizes positioning of five degrees of freedom under the combined action of the fourth positioning block, a second positioning block A112a, a second positioning block B112B and the workbench, and moves and is tightly jacked through a third positioning block 113 to realize positioning of a sixth degree of freedom; secondly, when the telescopic cylinder 122 retracts, the upper end of the rectangular frame is pressed tightly through the pressing plate 121, and then milling can be carried out.

In this embodiment, preferably, the ejection mechanism includes: the third connecting rod 13, the fourth connecting rod 14 and the telescopic rod 15, which may be hydraulic cylinders, one end of the telescopic rod 15 is connected to the workbench, the other end of the telescopic rod is hinged to one end of the third connecting rod 13 and one end of the fourth connecting rod 14, the other end of the third connecting rod 13 is hinged to the third positioning block 113, and correspondingly, the other end of the fourth connecting rod 14 is hinged to the fourth positioning block 114. When the telescopic rod 15 is pushed outwards, the third connecting rod 13 and the fourth connecting rod 14 are pushed to further push the third positioning block 113 and the fourth positioning block 114 to expand outwards to move and tightly push the rectangular rack, so that the pushing is realized, and the pushing force and the position are better in self-adaptive adjustment when the telescopic rod is pushed relative to a single cylinder.

In this embodiment, preferably, a guide inclined plane 115 is disposed on one side of each positioning block, which is close to the rectangular edge, from top to bottom. The guide slope 115 serves as a guide when the rectangular frame is placed downward.

In this embodiment, preferably, the first positioning block 111 is disposed near the middle point of the inner side of the first short side of the rectangular frame, the second positioning block a112a and the second positioning block B112B are disposed near the two ends of the inner side of the second long side of the rectangular frame, respectively, the third positioning block 113 is disposed near the middle point of the inner side of the third short side of the rectangular frame, and the fourth positioning block 114 is disposed near the middle point of the inner side of the fourth long side of the rectangular frame. The stress is more balanced.

The method comprises the following steps:

a body; the sliding table is equivalent to a sliding table on a machine tool and is used for mounting a machining tool and the like; the bottom of the guide rail is arranged on the workbench through the guide rail;

the first mandrel 21 is rotatably arranged on the body around the axis of the first mandrel 21, and a first face milling cutter disc 211 is coaxially arranged at the end part of the first mandrel 21; two ends of the mandrel are erected through bearing assemblies;

a second mandrel 22 which is rotatably arranged on the body around the axis thereof, two ends of the second mandrel are erected through bearing components, and the axis is parallel to the first mandrel 21; a second face milling cutter disc 221 is coaxially installed at the end of the second mandrel 22, and the milling faces of the second face milling cutter disc 221 and the first face milling cutter disc 211 are in the same plane; the rotation axes of the first face milling cutter disc 211 and the second face milling cutter disc 221 are arranged in a front-back staggered manner along the milling feed direction, and the milling areas of the first face milling cutter disc 211 and the second face milling cutter disc 221 are partially overlapped, so that the situation that milling cannot be performed between the two face milling cutter discs when the two face milling cutter discs are fed is prevented; the first mandrel 21 and the second mandrel 22 are both in transmission connection with a rotary drive.

When the milling cutter is used specifically, the first face milling cutter disc 211 and the second face milling cutter disc 221 are close to the to-be-machined face of the workpiece, when the workpiece moves relative to the feed direction, a wider range can be machined through one-time feed of two or more face milling cutter discs, the feed times are reduced, meanwhile, the diameter of the face milling cutter disc can be selected to be moderate, and the rigidity of the face milling cutter disc is guaranteed relative to a large-diameter cutter disc.

In this embodiment, preferably, the end portions of the first mandrel 21 and the second mandrel 22 are all coaxially provided with a positioning column 201, correspondingly, one sides of the first face milling cutter disc 211 and the second face milling cutter disc 221, which deviate from the milling face, are all coaxially provided with a positioning counter bore 202 in a matching manner, and the positioning column 201 is tightly matched with the positioning counter bore 202. The center of the face milling cutter disc is provided with a mounting hole in a penetrating mode, correspondingly, the end portion of the positioning column 201 is provided with a mounting screw hole in the axis direction, and the tensioning bolt penetrates through the mounting hole and then is matched in the mounting screw hole to tension the face milling cutter disc on the positioning column 201.

In this embodiment, preferably, the positioning column 201 is provided with a limiting block 203 along a radial direction, and correspondingly, a matching limiting groove 204 is provided on a side of the milling cutter disc away from the milling surface, and the side surface of the limiting block 203 is matched with the limiting groove 204 to transmit torque.

In this embodiment, preferably, a large positioning plane 205 perpendicular to the axis is further disposed at one end of the mandrel close to the positioning column 201, the end surface of the limiting block 203 abuts against the large positioning plane 205 and is locked by a first bolt 206 penetrating through the limiting block 203 to the large positioning plane 205, and the axis of the first bolt 206 is parallel to the axis of the mandrel. The limiting block 203 and the positioning column 201 are arranged to be split, so that the milling cutter is convenient to process on one hand, and the limiting block 203 can be manufactured to be different in thickness on the other hand, so that the situation that milling is not coplanar due to processing and assembling errors between the milling cutter discs and the positioning column 201 is finely adjusted.

In this embodiment, another modification of the installation of the limiting block 203 is that one end of the core shaft close to the positioning column 201 is further provided with a large positioning plane 205 perpendicular to the axis and a second limiting groove 207 opened along the radial direction, the second limiting groove 207 penetrates through the large positioning plane 205, when the limiting groove 204 aligns with the second limiting groove 207, two end faces of the limiting block 203 are respectively matched with the limiting groove 204 and the second limiting groove 207 and are inserted into the same along the radial direction, and the limiting block 203 is locked by a second bolt 208 penetrating through the limiting block 203 to the positioning column 201. The advantage of such setting lies in, when adjusting each face milling cutter dish milling face position, need not dismantle face milling cutter dish completely, only need loosen a small segment of face milling cutter dish, just can radially shift out the change with stopper 203.

In this embodiment, preferably, the method further includes: third dabber 23 rotates install in on the body, the axis is parallel with first dabber 21, second dabber 22, and the coaxial arrangement of third dabber 23 tip has third face milling cutter dish 231, and third face milling cutter dish 231 and first face milling cutter dish 211, second face milling cutter dish 221 milling process face are in the coplanar, and dislocation set around third face milling cutter dish 231 and first face milling cutter dish 211 axis of rotation are along milling the direction of feed, and the regional part of milling process of third face milling cutter dish 231 and first face milling cutter dish 211 overlaps. The central connecting line of the second mandrel 22 and the third mandrel 23 is perpendicular to the milling feed direction. Several face milling cutter discs may also be provided in the manner described above.

In this embodiment, preferably, a driving wheel 24 is coaxially disposed at the other end of the first core shaft 21, and the second core shaft 22 is in driving fit connection with the first core shaft 21 through a gear set 25.

In this embodiment, preferably, a transmission wheel 24 is coaxially disposed at the other end of the first spindle 21, and the second spindle 22, the third spindle 23 and the first spindle 21 are in transmission fit connection through a gear set 25. The spindles can be coaxially provided with gears, the gears on the two adjacent spindles are matched to form a transmission gear set, and the rotation directions of the gears are opposite.

In this embodiment, preferably, the method further includes: the milling device comprises a slide carriage 3, the slide carriage 3 is movably erected on a guide rail 4 arranged along the length moving direction of each side of the rectangular rack, and the milling device 2 is arranged on the slide carriage 3 in a sliding mode along the direction perpendicular to the vertical face of each side of the rectangular rack. Wherein, four guide rail grooves 41 used for installing the guide rails 4 on the workbench are formed by one-time milling processing so as to ensure the vertical precision of the four guide rails; the slide carriage 3 is driven by a first screw rod assembly 5, and the first screw rod assembly 5 is arranged in parallel with the guide rail 4; a first screw rod is rotatably arranged below the workbench around a horizontal shaft, the length of the first screw rod extends to be consistent with that of the guide rail 4, the end part of the first screw rod is driven by a first stepping motor, and correspondingly, a first screw rod nut matched with the first screw rod is arranged at the bottom of the slide carriage 3 so as to drive the slide carriage 3 to move along the length direction of the rectangular edge to perform feed milling; the bottom of the milling device 2 is provided with a dovetail groove along the direction perpendicular to the side vertical face of the rectangular rack, correspondingly, the slide carriage 3 is provided with matched dovetail teeth, the slide carriage 3 is driven by the second lead screw assembly 6, namely, the slide carriage 3 is rotatably provided with the second lead screw around the horizontal shaft, the axis of the second lead screw is perpendicular to the side vertical face of the rectangular edge, the second lead screw part is in transmission connection through the second stepping motor, correspondingly, the bottom of the body of the milling device 2 is provided with the second lead screw nut matched with the second lead screw, and the second lead screw nut is used for driving the face milling cutter disc on the body of the milling device 2 to move close to the face to be milled and adjusting the feeding amount.

s1, workpiece clamping: hoisting the rectangular frame to a workbench through hoisting equipment, and positioning and pressing through a positioning mechanism 11 and a clamping mechanism 12;

s2, synchronous milling: the four milling devices 2 mill the outer vertical surfaces of all sides of the rectangular rack at the same time, and move in a square loop along the counterclockwise direction at the same time to mill the four vertical surfaces;

s3, removing the workpiece: the positioning mechanism 11 and the clamping mechanism 12 loosen the workpiece, the workpiece is lifted away through the lifting device, and the milling device 2 returns to the initial position to prepare for next milling of the workpiece.

Understandably, four vertical surfaces can be milled at one time, so that the vertical precision of each surface is ensured while the efficiency is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Claims

1. The utility model provides a synchronous milling process equipment of rectangle frame multiaspect which characterized in that includes:

the workbench is used for horizontally placing the rectangular rack;

positioning mechanism (11) comprising at least: the positioning device comprises a first positioning block (111) which is fixedly arranged on the workbench and tightly abuts against the inner side of a first short side of the rectangular rack, a second positioning block A (112a) and a second positioning block B (112B) which are fixedly arranged on the workbench at intervals and tightly abut against the inner side of a second long side of the rectangular rack, a third positioning block (113) which is arranged on the workbench and moved from inside to outside along the direction of the long side of the rectangle and used for tightly abutting against the inner side of a third short side of the rectangular rack, and a fourth positioning block (114) which is arranged on the workbench and moved from inside to outside along the direction of the short side of the rectangle and used; the third positioning block (113) and the fourth positioning block (114) are driven by an ejection mechanism;

clamping mechanism (12), set up in that the rectangle frame is close to each limit intersection inboard, include: the device comprises a pressure plate (121) and a telescopic cylinder (122), wherein one end of the telescopic cylinder (122) is connected to a workbench, and the other end of the telescopic cylinder is connected to the pressure plate (121); one end of the pressure plate (121) is hinged on the workbench in a rotating mode around a horizontal shaft, and the other end of the pressure plate is pressed on the upper end of the rectangular rack when retracting through the telescopic cylinder (122);

the four milling devices (2) are respectively arranged on the workbench in a moving mode along the length extension direction of each side of the rectangular rack and are used for milling the outer vertical surfaces of each side of the rectangular rack;

the milling device comprises a slide carriage (3) which is movably erected on a guide rail (4) arranged along the length moving direction of each side of the rectangular rack, and the milling device (2) is arranged on the slide carriage (3) in a sliding mode along the direction perpendicular to the vertical face of each side of the rectangular rack.

2. The rectangular-frame multi-face synchronous milling device according to claim 1, wherein the ejection mechanism comprises: the device comprises a third connecting rod (13), a fourth connecting rod (14) and a telescopic rod (15), wherein one end of the telescopic rod (15) is connected onto the workbench, the other end of the telescopic rod is hinged to one end of the third connecting rod (13) and one end of the fourth connecting rod (14), the other end of the third connecting rod (13) is hinged to a third positioning block (113), and correspondingly, the other end of the fourth connecting rod (14) is hinged to a fourth positioning block (114).

3. The multi-face synchronous milling equipment with the rectangular frame as claimed in claim 1, wherein one side of each positioning block close to the rectangular edge is provided with a guide inclined surface (115) which is close to the rectangular edge from top to bottom.

4. The rectangular rack multi-face synchronous milling machining device according to claim 1, wherein the first positioning block (111) is arranged close to the middle point of the inner side of the first short side of the rectangular rack, the second positioning block A (112a) and the second positioning block B (112B) are respectively arranged close to two ends of the inner side of the second long side of the rectangular rack, the third positioning block (113) is arranged close to the middle point of the inner side of the third short side of the rectangular rack, and the fourth positioning block (114) is arranged close to the middle point of the inner side of the fourth long side of the rectangular rack.

5. The rectangular-frame multi-face synchronous milling device according to claim 1, wherein the milling device comprises:

a body;

the first mandrel (21) is rotatably arranged on the body around the axis of the first mandrel, and a first face milling cutter disc (211) is coaxially arranged at the end part of the first mandrel (21);

a second mandrel (22) rotatably mounted on the body about an axis thereof, the axis being parallel to the first mandrel (21); a second face milling cutter disc (221) is coaxially installed at the end part of the second mandrel (22), and the milling surfaces of the second face milling cutter disc (221) and the first face milling cutter disc (211) are in the same plane; the rotation axes of the first face milling cutter disc (211) and the second face milling cutter disc (221) are arranged in a front-back staggered mode along the milling feed direction, and the milling processing areas of the first face milling cutter disc (211) and the second face milling cutter disc (221) are partially overlapped; the first mandrel (21) and the second mandrel (22) are in transmission connection with a rotary drive.

6. The multi-surface synchronous milling equipment with the rectangular frame is characterized in that end portions of the first mandrel (21) and the second mandrel (22) are coaxially provided with positioning columns (201), correspondingly, one sides, which face away from a milling surface, of the first milling cutter disc (211) and the second milling cutter disc (221) are coaxially provided with matched positioning counter bores (202), and the positioning columns (201) are tightly matched with the positioning counter bores (202).

7. The multi-surface synchronous milling equipment with the rectangular frame as claimed in claim 6, wherein the positioning column (201) is provided with a limiting block (203) along a radial direction, and correspondingly, a side of the milling cutter disc facing away from the milling surface is provided with a matched limiting groove (204), and the side surface of the limiting block (203) is matched with the limiting groove (204) to transmit torque.

8. The rectangular frame multi-face synchronous milling machining device is characterized in that one end, close to the positioning column (201), of the mandrel is further provided with a large positioning plane (205) perpendicular to the axis, the end face of the limiting block (203) abuts against the large positioning plane (205) and is locked through a first bolt (206) penetrating through the limiting block (203) to the large positioning plane (205), and the axis of the first bolt (206) is parallel to the axis of the mandrel.

9. The multi-surface synchronous milling equipment with the rectangular frame is characterized in that one end, close to the positioning column (201), of the mandrel is further provided with a large positioning plane (205) perpendicular to the axis and a second limiting groove (207) formed in the radial direction, the second limiting groove (207) penetrates through the large positioning plane (205), when the limiting groove (204) is aligned with the second limiting groove (207), two end faces of the limiting block (203) are respectively matched with the limiting groove (204) and the second limiting groove (207) and are inserted into the limiting groove (204) and the second limiting groove (207) in the radial direction, and the limiting block (203) is locked through a second bolt (208) penetrating through the limiting block (203) to the positioning column (201).

10. The machining method of the rectangular frame multi-face synchronous milling machining device according to any one of claims 1 to 9, characterized by comprising the following steps: