Box wall through hole front and back surface scraping tool and assembly method

Abstract

The present invention discloses a tool for scraping the front and back surfaces of a through hole in a box wall. One end of a tool rod is fixed on the main shaft of a machine tool. A combined cutter head is fixed on one side of a cutter disc in a centrally symmetrical manner. A basic bushing is pressed and fixed on the other end of the tool rod. A friction bushing and a protective bushing are pressed and fixed on both ends of the basic bushing. The protective bushing passes through the corresponding through hole in the box wall. The end cover, support column, cutter disc, basic bushing, friction bushing and protective bushing are fixedly connected into one body. The blade cutting edges of a pair of combined cutter heads face the inner plane of the through hole on the inner side or outer side of the box wall. The method comprises 1) using a tool for scraping the front and back surfaces of a through hole in the box wall, and 2) using the cutter disc to perform forward scraping cutting processing or to perform reverse scraping cutting processing when the cutter disc is installed in an upright position. The present invention can perform forward scraping and reverse scraping cutting processing on the planes on both sides of the through hole in the box wall, respectively, using only the same set of tools, which significantly improves the processing efficiency and processing quality and reduces the processing cost. It is suitable for processing various types of boxes and has good versatility.

Description

Technical Field

[0001] The present invention relates to a special tool for cutting box parts, in particular to a special tool and method capable of respectively flattening outer planes of inner and outer through holes in a box wall, belonging to the technical field of metal cutting. Background Art

[0002] Box-type components generally have multiple through holes. The inner and outer sides of the box wall near the through holes need to be processed with corresponding positive and negative scraping respectively to serve as the installation reference for bearings, end covers or other parts. The quality of the positive and negative scraping directly affects the assembly quality of the parts, and thus affects the performance and service life of the entire machine.

[0003] The diameter of the plane that requires positive scraping and reverse scraping of some box-type parts is much larger than the diameter of the through hole. Due to the limitations of the location or shape of the parts, it is impossible to complete the positive scraping and reverse scraping of the inner and outer sides of the through hole in the box wall with one clamping and one tool, which affects the processing quality, extends the processing cycle, and increases the processing cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a tool for scraping the front and back surfaces of a box wall through hole and an assembly method thereof, so as to improve processing quality and reduce processing cost.

[0005] The present invention is achieved through the following technical solutions:

[0006] A tool for scraping the front and back surfaces of a through hole in a box wall, comprising a tool handle, a tool rod, a tool disc, a pair of combined cutter heads, a basic bushing, a friction bushing, a protective bushing and an end cover. The tapered end of the tool handle is inserted and fixed in the spindle hole of a machine tool, the cylindrical end of the tool handle is inserted and positioned in the center of one end of the tool rod, and the tool rod is fixed to the spindle of the machine tool by connecting screws passing through both sides of the flange at one end of the tool rod; the combined cutter heads are fixed on one side of the cutter disc in a centrally symmetrical manner, the basic bushing is pressed into and fixed on the support column at the other end of the tool rod, and the end faces of the friction bushing and the protective bushing are butted against each other. They are respectively pressed and fixed on the two ends of the basic bushing; the protective bushing passes through the corresponding through-hole in the box wall and is clearance-matched with the corresponding through-hole in the box wall; the center of the cutter disc is fixed to the end of one end of the support column of the cutter rod through a pair of flat keys, one end of the friction bushing is against one side of the cutter disc, and the end cover is pressed on the other end of the basic bushing. The end cover, support column, cutter disc, basic bushing, friction bushing and protective bushing are fixedly connected into one by screws; the cutting edges of the blades of a pair of combined cutter heads are facing the inner plane of the through-hole on the inner side of the box wall, or the outer plane of the through-hole on the outer side of the box wall.

[0007] The purpose of the present invention can be further achieved by the following technical measures.

[0008] Furthermore, one side of the cutter disc is provided with several pairs of blade body grooves evenly distributed in a fan shape. Each pair of blade body grooves is symmetrical about the axis of the cutter disc. The blade body grooves include a rectangular groove and a mounting groove with an inclined bottom surface. The adjacent sides of the rectangular groove and the mounting groove are connected and correspond to the shapes of the two sides of the bottom of the combined cutter head. The mounting groove is also provided with several threaded holes arranged at intervals for fixing the combined cutter head. The axes of the threaded holes are perpendicular to the plane of the cutter disc. An annular groove is provided on one side of the blade body groove of the cutter disc, and one end of the friction bushing rests on the bottom surface of the annular groove.

[0009] Furthermore, the bottom side of the blade body of the combination cutter head includes a ridge and an inclined surface connected to adjacent edges, corresponding to the rectangular groove and mounting groove of the cutter disc. The ridge and inclined surface are respectively embedded and positioned in the corresponding rectangular groove and cutter body groove of the cutter disc. The cutter body is longitudinally inverted L-shaped, and fastening screws that pass through the cutter body and are screwed into corresponding threaded holes in the cutter disc secure the cutter body to corresponding positions of the pair of cutter body grooves of the cutter disc. The blade of the combination cutter head is fixed to the horizontal side of the inverted L-shape by a clamping screw, and the blade cutting edge is parallel to the center plane of the box wall. The blade is a polygonal carbide blade.

[0010] Furthermore, the base bushing and the friction bushing are both made of carbon steel, and the protection bushing is made of bronze.

[0011] A method for assembling a tool for scraping the front and back surfaces of a box wall through hole comprises the following steps:

[0012] 1) Fix the combined cutter heads on the cutter disc respectively. First, fix the blades on the inverted L-shaped horizontal side of the cutter body by means of a tightening screw. Then, according to the diameter of the plane to be flattened, determine the positions of the combined cutter heads on the pair of cutter body grooves. Finally, fix the assembled combined cutter heads on the corresponding positions of the pair of cutter body grooves by means of tightening screws. Make sure that the convex strips on one side of the cutter body are respectively embedded in the corresponding rectangular grooves of the cutter disc. The inclined surface on one side of the cutter body is pressed against the inclined bottom surface of the cutter body groove. The cutting edges of the blades are respectively parallel to the center plane of the box wall.

[0013] 2) Assemble the tool arbor and tool holder assembly by inserting and securing the tapered end of the tool holder into the tapered hole of the machine tool spindle, inserting and positioning the cylindrical end of the tool holder into one end of the tool arbor, and then securing the machine tool spindle and tool arbor with setscrews passing through both sides of the flange at one end of the tool arbor; and installing a pair of flat keys at 180° to each other on the support column of the tool arbor;

[0014] 3) The cutter disc and bushings are installed on the support column of the cutter bar. The cutter disc, base bushing, friction bushing and protective bushing are installed on the end of the cutter bar away from the handle. Then, according to the different working conditions of scraping the inner plane of the box wall through hole (positive scraping) and scraping the outer plane of the box wall through hole (reverse scraping), the following different assemblies are performed:

[0015] 3.1) The cutter disc is installed in the right position for scraping and cutting. First, install the cutter disc on the support column of the cutter bar, so that the cutting edge of the blade of the combined cutter head on the cutter disc is facing away from the direction of the tool handle. The keyways on both sides of the center hole of the cutter disc are respectively embedded in the corresponding flat keys, and the basic bushing is pressed into and fixed on the support column at the other end of the cutter bar; then, the friction bushing and the protective bushing are pressed into and fixed on the two ends of the basic bushing in sequence with their end faces facing each other, with the friction bushing close to the tool handle and the protective bushing away from the tool handle. The end head of the friction bushing is embedded and positioned in the annular groove of the cutter disc; the end The cover is pressed on the other end of the basic bushing, and the end cover, support column, cutter head, basic bushing, friction bushing and protective bushing are fixedly connected into one body by screws; then the machine tool is started, and the machine tool spindle drives the tool rod to move outward until the protective bushing on the support column at the other end of the tool rod extends into the through hole on the inner side of the box wall, the outer circular surface of the protective bushing is in clearance with the through hole in the box wall, and the cutting edges of the blades of a pair of combined cutter heads on the cutter head are aligned with the inner plane of the through hole in the box wall; then the machine tool spindle is started to complete the positive scraping cutting process on the inner plane of the through hole in the box wall;

[0016] 3.2) The cutter head is reversed for reverse scraping and cutting. First, the basic bushing is pressed into the support column fixed on the other end of the tool rod, and then the protective bushing and the friction bushing end faces are pressed into and fixed on the two ends of the basic bushing in sequence, with the friction bushing facing away from the tool handle and the protective bushing close to the tool handle; then the machine tool is started, and the machine tool spindle drives the tool rod to move outward until the protective bushing on the support column at the other end of the tool rod extends into the through hole of the box wall, and the other end of the basic bushing and the other end of the friction bushing extend out of the through hole of the box wall, and the outer cylindrical surface of the protective bushing is in clearance with the corresponding through hole of the box wall; then the cutter head is turned 180° and embedded in the one that has extended out of the box wall On the support column of the tool rod on the outer side of the through hole, the keyways on both sides of the center hole of the cutter disc are respectively embedded in the corresponding flat keys, and one end of the friction bushing is embedded and positioned in the annular groove of the cutter disc, and the blade cutting edge of the combined cutter head on the cutter disc faces the direction of the tool handle; the end cover is pressed on the other side of the cutter disc and the other end of the support column, and the screws are tightened to fix the end cover, support column, cutter disc, basic bushing, friction bushing and protective bushing into one, and the blade cutting edges of a pair of combined cutter heads on the cutter disc are aligned with the outer plane of the through hole on the outside of the box wall; the machine tool spindle can be started to complete the reverse scraping cutting processing of the outer plane of the through hole on the box wall.

[0017] The present invention adopts a structure in which the support column at one end of the tool rod, the cutter disc, the base bushing, the friction bushing and the protective bushing are fixedly connected into one piece by an end cover and screws, and different assembly methods of the cutter disc being installed in the forward or reverse direction. By using only the same set of cutting tools, the planes on both sides of the through hole of the box wall of the box body that has been clamped and aligned once can be subjected to forward scraping and reverse scraping cutting respectively. The present invention significantly improves the processing efficiency and processing quality, and reduces the processing cost. The combined cutter head can be fixed at different radial positions of the cutter disc to meet the needs of forward scraping or reverse scraping cutting of planes of different diameters inside and outside the through hole of the box wall. It is very convenient to adjust, and is suitable for various types of box wall scraping and cutting, with good versatility.

[0018] Advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments thereof, which are given by way of example only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of the cutter head being installed in a normal position for positive scraping and cutting processing;

[0020] Figure 2 This is a schematic diagram of the structure in which the cutter head is reversely mounted for reverse scraping and cutting processing;

[0021] Figure 3 yes Figure 1 A magnified view of part I;

[0022] Figure 4 yes Figure 2 The enlarged view of part II;

[0023] Figure 5 It is a schematic diagram of the combined cutter head installed on the cutter disc;

[0024] Figure 6 yes Figure 5 A-axis enlarged view. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and examples.

[0026] In the description of the present invention, terms indicating directions or positions such as “inside”, “outside”, “left” and “right” are based on the directions shown in the drawings and are only used to simplify the description, and do not indicate or imply that the present invention must have a specific direction or position.

[0027] like Figure 1 and Figure 2 As shown, the tool for scraping the front and back surfaces of the box wall through hole of the present invention includes a tool handle 1, a tool rod 2, a tool disc 3, a pair of combined cutter heads 4, a basic bushing 5, a friction bushing 6, a protective bushing 7 and an end cover 8. The tapered end 11 of the tool handle 1 is inserted and fixed in the spindle hole 101 of the machine tool, and the cylindrical end 12 of the tool handle 1 is inserted and positioned in the center of the left end of the tool rod 2. The tool rod 2 is fixedly connected to the machine tool spindle 100 by connecting screws 14 that pass through both sides of the flange 13 of the left end of the tool rod.

[0028] like Figures 3 to 6As shown, one side of the cutter disc 3 is provided with four pairs of blade body slots 31 evenly distributed in a fan shape. Each pair of blade body slots 31 is centrally symmetrical about the axis of the cutter disc 3. The blade body slots 31 include a rectangular slot 311 and a mounting slot 312 with an inclined bottom surface. The adjacent edges of the rectangular slot 311 and the mounting slot 312 are connected, corresponding to the shapes of the two sides of the bottom of the combined cutter head 4. The mounting slot 312 is also provided with four threaded holes 33 spaced apart for fixing the combined cutter head 4. These are used to position and fix the combined cutter head 4 at different positions on the mounting slot 312 to form four different cutting radii, meeting the needs of scraping and leveling boxes of different sizes, thereby improving the versatility of the present invention. Alternatively, the combined cutter head 4 can be fixed to different mounting slots 312, greatly extending the service life of the cutter disc 3. The axis of the threaded hole 33 is perpendicular to the plane of the cutter disc 3, facilitating the fixing of the combined cutter head 4.

[0029] The combined cutter head 4 is fixed to one side of the cutter disc 3 in a centrally symmetrical manner. The bottom side of the blade body 41 of the combined cutter head 4 includes a ridge 411 and a bevel 412 connected to adjacent edges and corresponding to the rectangular groove 311 and the mounting groove 312 of the cutter disc 3. The ridge 411 and the bevel 412 are respectively embedded and positioned in the corresponding rectangular groove 311 and the blade body groove 312 of the cutter disc 3. The cutter body 41 is in an inverted L-shape in the longitudinal direction. The fastening screws 43 that pass through the cutter body 41 and are screwed into the corresponding threaded holes 33 of the cutter disc 3 fix the cutter body 41 to the corresponding positions of a pair of blade body grooves 312 of the cutter disc 3. The ridge 411 plays a positioning role, protecting the fastening screws 43 from lateral forces during scraping. The blade 42 of the combined cutter head 4 is fixed to the inverted L-shaped horizontal edge 413 by a clamping screw 44, and the blade cutting edge 421 is parallel to the center plane of the box wall 200. The blade 42 of this embodiment is a triangular carbide blade that can be indexed, which extends the service life of the blade 42.

[0030] like Figure 3 and Figure 4 As shown, the basic bushing 5 is pressed into and fixed on the support column 21 at the right end of the tool arbor 2, and the two are interference fit. The end faces of the friction bushing 6 and the protective bushing 7 are respectively pressed into and fixed on the two ends of the basic bushing 5, and the friction bushing 6, the protective bushing 7 and the basic bushing 5 are interference fit. The protective bushing 7 passes through the corresponding box wall through hole 201 and has a clearance fit with the corresponding box wall through hole 201, so that the basic bushing 5, the friction bushing 6 and the protective bushing 7 can rotate together with the tool arbor 2 around the box wall through hole 201 in a conical shape. The center of the cutter disc 3 is fixed to one end of the support column 21 of the tool arbor 2 by a pair of flat keys 211. An annular groove 32 is provided on one side of the blade groove 31 of the cutter disc 3. One end of the friction bushing 6 rests on the bottom surface of the annular groove 32, so that the friction bushing 6 is axially positioned.

[0031] The end cap 8 is pressed onto the other end of the base bushing 5, and the end cap 8, support column 21, cutter head 3, base bushing 5, friction bushing 6, and protective bushing 7 are fixedly connected together by screws 81. The cutting edges 421 of the blades of the pair of combined cutter heads 4 are directly facing the inner surface 202 of the box wall through hole on the inner side of the box wall 200, or the outer surface 203 of the box wall through hole on the outer side of the box wall 200.

[0032] The base bushing 5 and the friction bushing 6 are both made of carbon steel, and the protection bushing 7 is made of bronze.

[0033] A method for assembling a tool for scraping the front and back surfaces of a box wall through hole comprises the following steps:

[0034] 1) Fix the combined cutter heads 4 to the cutter disc 3. First, fix the blade 42 to the inverted L-shaped horizontal edge 413 of the cutter body 41 by means of the tightening screw 44. Then, determine the position of the combined cutter heads 4 to be fixed to the pair of cutter body grooves 31 according to the diameter of the plane to be flattened. Finally, fix the assembled combined cutter heads 4 to the corresponding positions of the pair of cutter body grooves 31 by means of the tightening screws 43. Figure 6 The convex strips 411 on the left side of the blade body 41 are respectively embedded and positioned in the corresponding rectangular grooves 311 of the blade disc 3, and the inclined surface 412 on the right side of the blade body 41 is pressed against the inclined bottom surface of the blade groove 312, and the blade cutting edge 421 is respectively parallel to the center plane of the box wall.

[0035] 2) Assemble the tool arbor 2 and tool holder 1 assembly. Insert and secure the tapered end 11 of the tool holder 1 into the tapered hole 101 in the machine spindle. Insert and position the cylindrical end 12 of the tool holder 1 into the left end of the tool arbor 2. Secure the machine spindle 100 to the tool arbor 2 using setscrews 13 inserted through both sides of the tool arbor's left end flange 12. Install a pair of flat keys 211, oriented 180° apart, on the support column 21 of the tool arbor 2.

[0036] 3) The cutter disc 3 and the bushings are installed on the support column 21 of the cutter bar 2. The cutter disc 3, the base bushing 5, the friction bushing 6 and the protective bushing 7 are installed on the right end of the cutter bar 2 away from the handle 1. Then, according to the different working conditions of scraping the inner plane 202 of the box wall through hole, i.e., forward scraping, and scraping the outer plane 203 of the box wall through hole, i.e., reverse scraping, the following different assemblies are performed:

[0037] 3.1) The cutter head 3 is mounted upright to perform scraping and cutting. Figure 3 and Figure 4 As shown, first install the cutter head 3 on the support column 21 of the cutter bar 2, so that the cutting edge 421 of the blade of the combined cutter head 4 on the cutter head 3 faces right away from the handle 1, as shown in FIG. Figure 5 The keyways 341 on both sides of the cutter head center hole 34 are respectively embedded in the corresponding flat keys 211, and the base bushing 5 is pressed into the support column 21 fixed on the right end of the cutter bar 2. Then the friction bushing 6 and the protective bushing 7 are as shown. Figure 3As shown, the left and right end faces are pressed into and fixed on the two ends of the basic bushing 5 in sequence, and the friction bushing 6 is close to the tool handle 1, that is, on the left end of the basic bushing 5; the protective bushing 7 is away from the tool handle 1, that is, on the right end of the basic bushing 5. The left end of the friction bushing 6 is embedded and positioned in the annular groove 32 of the cutter head 3. The end cover 8 is pressed on the right end of the basic bushing 5, and the end cover 8, support column 21, cutter head 3, basic bushing 5, friction bushing 6 and protective bushing 7 are fixedly connected into one body by screws 81. Then the machine tool is started, and the machine tool spindle 100 drives the tool rod 2 to move outward until the protective bushing 5 on the support column 21 at the right end of the tool rod 2 extends into the box wall through hole 201, and the outer cylindrical surface of the protective bushing 7 is in clearance with the box wall through hole 201, which facilitates the rotation of the tool rod 1; the blade cutting edges 421 of a pair of combined cutter heads 4 on the cutter head 3 are aligned to the right with the inner plane 202 of the box wall through hole. The machine tool spindle 100 can be started to complete the forward scraping cutting process of the inner surface 202 of the box wall through hole.

[0038] 3.2) The cutter head 3 is reversed to perform reverse scraping and cutting, such as Figure 4 and Figure 5 As shown, the base bushing 5 is first pressed into and fixed on the support column 21 at the right end of the tool arbor 2. The protective bushing 7 and friction bushing 6 are then pressed into and fixed on both ends of the base bushing 5, one on the left and one on the right, with the left and right end faces of the protective bushing 7 facing away from the tool shank 1, that is, on the right end of the base bushing 5; the protective bushing 7 is closer to the tool shank 1, that is, on the left end of the base bushing 5. The machine tool is then started, and the machine tool spindle 100 drives the tool arbor 2 outward until the protective bushing 7 on the support column 21 at the right end of the tool arbor 2 extends into the box wall through-hole 201, and the right ends of the base bushing 5 and the friction bushing 6 extend out of the box wall through-hole 201, and the outer circumferential surface of the protective bushing 7 is clearance-matched with the corresponding box wall through-hole 201. Then, turn the cutterhead 3 180° and insert it into the support column 21 of the cutter bar 2, which has extended outward from the through-hole in the box wall. Ensure that the keyways 341 on either side of the cutterhead's center hole 34 fit over the corresponding flat keys 211. The right end of the friction bushing 6 is positioned in the annular groove 32 of the cutterhead 3, with the blade cutting edge 421 of the modular cutter head 4 on the cutterhead 3 facing leftward, toward the tool shank 1. The end cap 8 is pressed against the right side of the cutterhead 3 and the right end of the support column 21. Screws 81 are tightened to securely connect the end cap 8, support column 21, cutterhead 3, base bushing 5, friction bushing 6, and protective bushing 7. The pair of blade cutting edges 421 of the modular cutter head 4 on the cutterhead 3 are aligned with the outer surface 203 of the through-hole in the box wall. The machine tool spindle 100 is then started, completing the reverse scraping process of the outer surface 203 of the through-hole in the box wall.

[0039] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. A tool for scraping the front and back surfaces of a box wall through hole, characterized by: The utility model comprises a tool holder, a tool rod, a tool disc, a pair of combined cutter heads, a basic bushing, a friction bushing, a protective bushing and an end cover. The tapered end of the tool holder is inserted and fixed in the main spindle hole of the machine tool, the cylindrical end of the tool holder is inserted and positioned in the center of one end of the tool rod, and the tool rod is fixed to the main spindle of the machine tool by connecting screws passing through both sides of the flange of one end of the tool rod; the combined cutter heads are fixed on one side of the cutter disc in a central symmetrical manner, the basic bushing is pressed into and fixed on the support column at the other end of the tool rod, and the end faces of the friction bushing and the protective bushing are pressed into and fixed on On both ends of the basic bushing; the protective bushing passes through the corresponding box wall through-hole and is in clearance with the corresponding box wall through-hole; the center of the cutter disc is fixed to the end of one end of the support column of the cutter rod through a pair of flat keys, one end of the friction bushing is against one side of the cutter disc, and the end cover is pressed on the other end of the basic bushing. The end cover, support column, cutter disc, basic bushing, friction bushing and protective bushing are fixedly connected into one body by screws; the cutting edges of the blades of a pair of combined cutter heads are facing the inner plane of the through-hole on the inner side of the box wall, or the outer plane of the through-hole on the outer side of the box wall; One side of the cutter disc is provided with several pairs of cutter body grooves evenly distributed in a fan shape, and each pair of cutter body grooves is symmetrical with the axis of the cutter disc. The cutter body groove includes a rectangular groove and a mounting groove with an inclined bottom surface. The adjacent sides of the rectangular groove and the mounting groove are connected, respectively corresponding to the shapes of the two sides of the bottom of the combined cutter head. The mounting groove is also provided with several threaded holes arranged at intervals for fixing the combined cutter head, and the axes of the threaded holes are perpendicular to the plane of the cutter disc; The bottom side of the cutter body of the combined cutter head includes a convex strip and an inclined surface connected to adjacent edges and corresponding to the rectangular groove and the mounting groove of the cutter disc, and the convex strip and the inclined surface are respectively embedded and positioned in the corresponding rectangular groove and the mounting groove of the cutter disc; the cutter body is longitudinally in an inverted L-shape, and fastening screws that pass through the cutter body and are screwed into the corresponding threaded holes of the cutter disc fix the cutter body to the corresponding positions of the pair of cutter body grooves of the cutter disc; the blade of the combined cutter head is fixed to the horizontal side of the inverted L-shape by a tightening screw, and the cutting edge of the blade is parallel to the center plane of the box wall; An annular groove is provided on one side of the cutter body groove of the cutter disc, and one end of the friction bushing is against the bottom surface of the annular groove.

2. The tool for scraping the front and back surfaces of a box wall through hole according to claim 1, characterized in that: The blade is a polygonal carbide blade.

3. The tool for scraping the front and back surfaces of a box wall through hole according to claim 1, characterized in that: The base bushing and the friction bushing are both made of carbon steel, and the protection bushing is made of bronze.

4. A method for assembling a tool for flattening the front and back surfaces of a box wall through hole according to any one of claims 1 to 3, characterized in that: The following steps are involved: 1) Fix the combined cutter heads on the cutter disc respectively. First, fix the blades on the inverted L-shaped horizontal side of the cutter body by means of compression screws. Then, according to the diameter of the plane to be flattened, determine the positions of the combined cutter heads on the pair of cutter body grooves. Finally, fix the assembled combined cutter heads on the corresponding positions of the pair of cutter body grooves by means of tightening screws. Make sure that the convex strips on one side of the cutter body are respectively embedded in the corresponding rectangular grooves of the cutter disc. The inclined surface on one side of the cutter body is pressed against the inclined bottom surface of the mounting groove. Make the cutting edges of the blades parallel to the center plane of the box wall. 2) Assemble the tool bar and tool holder assembly by inserting the tapered end of the tool holder into the spindle hole of the machine tool, inserting the cylindrical end of the tool holder into one end of the tool bar, and then fixing the machine tool spindle and tool bar with connecting screws passing through both sides of the flange at one end of the tool bar; install a pair of flat keys at 180 degrees to each other on the support column of the tool bar; 3) The cutter disc and bushings are installed on the support column of the cutter bar. The cutter disc, base bushing, friction bushing and protective bushing are installed on the end of the cutter bar away from the handle. Then, according to the different working conditions of scraping the inner plane of the box wall through hole (positive scraping) and scraping the outer plane of the box wall through hole (reverse scraping), the following different assemblies are performed: 3.1) For the cutterhead to be installed in the normal position for the scraping process, first install the cutterhead on the support column of the cutterbar, so that the cutting edge of the blade of the combined cutter head on the cutterhead faces away from the tool handle. The keyways on both sides of the cutterhead center hole are respectively embedded in the corresponding flat keys. The base bushing is pressed into and fixed to the support column at the other end of the cutterbar. Then, the friction bushing and the protective bushing are pressed into and fixed to the two ends of the base bushing in sequence with the end faces of the friction bushing facing each other, with the friction bushing close to the tool handle and the protective bushing away from the tool handle. One end of the friction bushing is embedded and positioned in the annular groove of the cutterhead. The end cover is pressed onto the other end of the base bushing, and the end cover, support column, cutter head, base bushing, friction bushing and protective bushing are fixedly connected into one body by screws; then the machine tool is started, and the machine tool spindle drives the tool rod to move outward until the protective bushing on the support column at the other end of the tool rod extends into the through hole of the box wall, the outer cylindrical surface of the protective bushing is in clearance with the through hole of the box wall, and the cutting edges of the blades of a pair of combined cutter heads on the cutter head are aligned with the inner plane of the through hole of the box wall; then the machine tool spindle is started, and the positive scraping cutting process of the inner plane of the through hole of the box wall is completed; 3.2) The cutter head is reversed for reverse scraping and cutting. First, the basic bushing is pressed into the support column fixed on the other end of the tool rod, and then the protective bushing and the friction bushing end faces are pressed into and fixed on the two ends of the basic bushing in sequence, with the friction bushing facing away from the tool handle and the protective bushing close to the tool handle; then the machine tool is started, and the machine tool spindle drives the tool rod to move outward until the protective bushing on the support column at the other end of the tool rod extends into the through hole of the box wall, and the other end of the basic bushing and the other end of the friction bushing extend out of the through hole of the box wall, and the outer cylindrical surface of the protective bushing is in clearance with the corresponding through hole of the box wall; then the cutter head is turned 180° and embedded in the extended On the tool rod support column on the outer side of the box wall through hole, the keyways on both sides of the center hole of the cutter disc are respectively embedded in the corresponding flat keys, and one end of the friction bushing is embedded and positioned in the annular groove of the cutter disc, and the blade cutting edge of the combined cutter head on the cutter disc faces the direction of the tool handle; the end cover is pressed on the other side of the cutter disc and the other end of the support column, and the screws are tightened to fix the end cover, support column, cutter disc, basic bushing, friction bushing and protective bushing into one, and the blade cutting edges of a pair of combined cutter heads on the cutter disc are aligned with the outer plane of the box wall through hole; the machine tool spindle can be started to complete the reverse scraping cutting processing of the outer plane of the box wall through hole.

Images