CN112958851A - Cutting tool with pre-tensioned spring and method of assembling same - Google Patents
Cutting tool with pre-tensioned spring and method of assembling same Download PDFInfo
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- CN112958851A CN112958851A CN202110297570.1A CN202110297570A CN112958851A CN 112958851 A CN112958851 A CN 112958851A CN 202110297570 A CN202110297570 A CN 202110297570A CN 112958851 A CN112958851 A CN 112958851A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000003825 pressing Methods 0.000 claims abstract description 86
- 230000009471 action Effects 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 230000036316 preload Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 abstract description 2
- 238000003801 milling Methods 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F21/00—Tools specially adapted for use in machines for manufacturing gear teeth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
- B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
- B23F23/1206—Tool mountings
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Abstract
The invention discloses a cutting tool with pre-tightening springs and an assembling method thereof, wherein the cutting tool comprises a tool body, the tool body is provided with tool grooves, threaded through holes are formed between the outer edge of the tool body and each tool groove, locking screws are arranged in the threaded through holes, a pressing block is arranged between each locking screw and a blade, a spring groove is formed in the inner side surface of the pressing block, a pre-tightening spring is arranged in the spring groove, the pre-tightening spring is provided with a pressing part which is in contact with the pressing surface of the blade in a smooth transition mode in the inserting and withdrawing directions, and in a pre-tightening state, the pressing part of the pre-tightening spring is higher than the inner side surface of the pressing block and is in contact with the pressing surface of the blade. The cutting tool can realize that the blade can enter a pre-tightening state when being inserted into the cutter groove during tool assembly, the blade can be continuously and smoothly inserted into and withdrawn from the cutter groove, the adjustment is easy, in addition, the number of parts is less, and the cutter strip can be ensured to be in a reasonable stress state.
Description
Technical Field
The invention relates to the technical field of gear cutters, in particular to a cutter bar type assembly cutter for cutting and machining a gear. The invention also relates to a method for assembling the tool.
Background
Gear cutting tools, which perform cutting while rotating substantially about a tool axis, can be simply divided into unitary tools and modular tools. The assembled tool typically has a tool body arranged with one or more pockets to accommodate the bar blades, each blade being positioned in a pocket and locked in its pocket with one or more locking screws and a press block.
The cutter bar type assembled cutter requires that on the basis that the cutting edge of the cutter reaches the cutter sharpening precision within a certain tolerance range, the cutting edge of the cutter of the same name after the cutter bar is assembled is adjusted and controlled within a certain tolerance range in the radial direction and the axial direction, and meanwhile, a locking screw and a pressing block have enough locking force on the cutter bar so as to prevent the cutter from changing in position in the cutting process.
When the traditional assembled cutter is assembled, the locking screw needs to be retracted to a sufficient clearance, the blade type blade can be placed in the cutter groove of the traditional assembled cutter, then the locking screw is rotated to enter a pre-tightening state, and the blade is adjusted to required precision and then locked to finish
In order to facilitate the precision adjustment of the blade bar type blade during the tool assembly, the blade bar type blade is usually prevented from sliding by applying proper pre-tightening force through a locking screw, a pressing block and a spring before the blade bar is completely locked. Therefore, the assembling or disassembling process of the tool with the blade assembly can be generally decomposed into three states, namely a free state, a pre-tightening state (or adjusting state) and a locking state (or completing state). When the blade is in a free state, the blade can freely move along the direction of the cutter groove guide line and in the radial direction in the cutter groove, the blade in the cutter groove in a pre-tightening state keeps still under the action of no external force, the blade can move up and down along the direction of the cutter groove guide line under the action of the action force along the direction of the cutter groove guide line to adjust the position, and after the blade is adjusted to a required position, the locking screw is rotated to push the pressing block to press the blade to enter a locking state.
A double-screw sword strip clamping structure as CN 204470996U discloses, its constitution includes: the cutter head main body is provided with a cutter groove for placing a blade, the outer ring is provided with two threaded holes for assembling screws at positions corresponding to each cutter groove, the pressing block is connected with the locking screws through clamping grooves, the other side, opposite to the clamping grooves, of the pressing block is pressed on a cutter bar inserted into the cutter groove, springs are arranged at the threaded bottoms of the pre-tightening screws, the other ends of the springs are extruded on the pressing block, and before the locking screws are locked, the pre-tightening force can be given to the pressing block by the springs at the bottom ends of the pre-tightening screws, so that the cutter bar is prevented from moving when the locking screws are locked.
However, when the clamping structure is operated, because the contact area between the knife strip and the pressing block is too large, when the knife strip moves up and down, a large friction force is generated between the knife strip and the pressing block, so that the knife strip is not continuous and smooth enough to insert and withdraw from the knife groove, and the movement of the knife strip during moving up and down is too harsh, so that the difficulty in adjusting the knife strip is increased.
To this end, CN 205851997U discloses a structure for pre-tightening and clamping a milling cutter bar by a single screw, which comprises: the milling cutter head comprises a milling cutter head main body, a milling cutter strip, a pre-tightening steel ball, a pressing block, a locking screw and an outer ring, wherein the pre-tightening steel ball can provide a pre-tightening force for the milling cutter strip when the milling cutter head is assembled, so that the milling cutter strip can be conveniently and simply fixed in a cutter adjusting process.
However, the structure for pre-tightening and clamping the milling cutter bar has more parts, at least three parts of a spring, a steel ball and a retainer ring are required, if the number of the milling cutter bars is 24, 24 springs, 24 steel balls and 24 retainer rings are required altogether, compared with the traditional cutter, 72 scattered parts are added, the assembly is very inconvenient, and because the spring hole needs to have a certain depth, the spring hole can only be located at an upper position on the pressing block in order to avoid a locking screw, the vertical stress of the milling cutter bar in a pre-tightening state is uneven, and an ideal pre-tightening effect is difficult to achieve.
Disclosure of Invention
The invention aims to provide a cutting tool with a pre-tightening spring. The cutting tool can realize that the blade can enter a pre-tightening state when being inserted into the cutter groove during the assembly of the cutting tool, the blade can be continuously and smoothly inserted into and withdrawn from the cutter groove, the adjustment is easy, in addition, the number of parts is less, and the cutter bar can be ensured to be in a reasonable stress state under the pre-tightening state.
It is another object of the present invention to provide an assembly method for assembling the cutting tool with a preloaded spring.
In order to achieve the above object, the present invention provides a cutting tool with a pre-tightening spring, comprising a tool body, wherein the tool body is provided with tool grooves for accommodating blades, at least one threaded through hole is formed between the outer edge of the tool body and the outer wall of each tool groove, a locking screw is arranged in each threaded through hole, a pressing block is arranged between each locking screw and each blade, the blade is positioned through the pressing block, a spring groove is arranged on the inner side surface of the pressing block, which is in contact with the pressed surface of the blade, a pre-tightening spring is arranged in each spring groove, the pre-tightening spring is provided with a pressing part, which is in contact with the pressed surface of the blade in the insertion and withdrawal directions in a smooth transition manner, the pressing part of the pre-tightening spring is higher than the inner side surface of the pressing block in a free state, a gap is formed between the pressing part and, the pressure applying part of the pre-tightening spring is higher than the inner side surface of the pressing block after the pre-tightening spring is pressed and deformed and is in contact with the pressed surface of the blade, the pre-tightening spring is completely accommodated in a space formed by the pressed surface of the blade and the spring groove of the pressing block after being pressed and deformed in a locking state, and the inner side surface of the pressing block is in contact with the pressed surface of the blade.
Preferably, a threaded through hole is formed between the outer edge of the cutter body and the outer wall of each cutter groove, and the pressing part of the pre-tightening spring is transversely aligned with the locking screw.
Preferably, two threaded through holes are formed between the outer edge of the cutter body and the outer wall of each cutter groove, an upper locking screw and a lower locking screw are respectively arranged in each threaded through hole, and the pressing part of the pre-tightening spring is approximately positioned in the middle of the upper locking screw and the lower locking screw in the vertical direction.
Preferably, one end of the pre-tightening spring is fixedly connected with the pressing block in the spring groove.
Preferably, two ends of the pre-tightening spring are fixedly connected with the pressing block in the spring groove.
Preferably, a clamping part is arranged in the spring groove, and two ends of the pre-tightening spring are clamped at the clamping part of the spring groove.
Preferably, the clamping position is formed at clamping grooves at the upper end and the lower end of the spring groove, clamping joints are formed at the two ends of the pre-tightening spring, and the clamping joints depend on resilience clamping of the two ends of the pre-tightening spring after deformation towards the middle in the clamping grooves.
Preferably, the pre-tightening spring is a bow spring, a wave spring, a leaf spring or a wire spring, and a pressing part for contacting with the pressure surface of the blade is formed at a part protruding laterally relative to the inner side surface of the pressing block.
To achieve the above another object, the present invention provides a method for assembling a cutting tool having a preloaded spring, the method for assembling the cutting tool of any one of the above aspects, comprising:
rotating at least one locking screw through a first torque to push the pressing block to move forwards inwards, and driving the pre-tightening spring to be in surface contact with the pressed surface of the blade by the pressing block;
before the inner side surface of the pressing block is advanced to be in contact with the pressed surface of the knife strip, the compression amount of the pre-tightening spring is adjusted, so that the generated pre-tightening force can prevent the blade from sliding along the guide line direction of the knife groove under the action of no external force, and meanwhile, the position of the blade can be adjusted up and down under the action of the action force along the guide line direction of the knife groove;
after the pressing block advances to the inner side surface and contacts with the pressed surface of the cutter bar, the locking screw is rotated through a second torque, and the locking force of the pressing block and the pre-tightening spring on the blade is adjusted.
Further, at least one locking screw is reversely rotated and withdrawn outwards through a third torque to adjust locking force, pretightening force or loosen the blade, and the third torque is larger than the second torque.
The cutting tool provided by the invention can realize that the blade can enter a pre-tightening state when being inserted into the cutter groove during the assembly of the cutting tool through pre-tightening the blade by the pressing block with the pre-tightening spring and the locking screw, can also be operated by a single hand, is beneficial to improving the cutter installing efficiency, can control the pre-tightening force by adjusting the deformation amount of the pre-tightening spring, is convenient for the position adjustment of the blade, and can continuously and smoothly insert and withdraw the blade into the cutter groove because the pressing part of the pre-tightening spring is contacted with the blade in a tangent mode, thereby being easy to adjust. In addition, the pressing part is formed by the self construction of the pre-tightening spring, other parts do not need to be additionally arranged, the structure is simple, the assembly is easy, the depth of the spring groove is shallower compared with the spring hole, and the spring groove can be arranged at an ideal position, so that the cutter bar can be ensured to be in a more reasonable stress state in the pre-tightening state.
The assembling method provided by the invention is used for assembling the cutting tool with the pre-tightening spring, and the cutting tool has the technical effects, so the assembling method for assembling the cutting tool also has the corresponding technical effects.
Drawings
FIG. 1 is a cross-sectional view of a cutting tool with a preloaded spring as disclosed in an embodiment of the present invention in a free state;
FIG. 2 is an isometric view of the pressure block of FIG. 1 with the bow spring disposed therein;
FIG. 3 is a cross-sectional view of a cutting tool with a pre-tensioned spring, in a pre-tensioned state, according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of a cutting tool with a pre-tensioned spring in a locked state as disclosed in an embodiment of the present invention;
fig. 5 is a cross-sectional view of a cutting tool with a pre-tensioned spring according to an embodiment of the present invention, when assembled, the blade is inserted into the pocket to a pre-tensioned state.
In the figure:
1. cutter body 2, blade 3, pressing block 5, cutter groove 6, upper locking screw 7, lower locking screw 8, spring groove 81, clamping groove 9, bow spring 91 and clamping head
Detailed Description
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In this specification, terms such as "upper, lower, left, right" and the like are established based on positional relationships shown in the drawings, and depending on the drawings, the corresponding positional relationships may vary, and the direction defined by the characters is preferentially adopted in the direction defined by the characters in the specification, and therefore, the scope of protection is not absolutely limited; moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
Referring to fig. 1 and 2, fig. 1 is a cross-sectional view of a cutting tool with a pre-tensioned spring in a free state according to an embodiment of the present invention; FIG. 2 is an isometric view of the pressure block of FIG. 1 with the bow spring disposed therein.
As shown in the drawings, in an embodiment, the cutting tool with a pre-tightening spring provided by the present invention mainly comprises a tool body 1, a plurality of blades 2, a pressing block 3, and locking screws, wherein the tool body 1 is disc-shaped, and is provided with cutter grooves 5 which are vertically through and annularly distributed to accommodate and fix the blades 2, two threaded through holes are respectively formed between the outer edge of the tool body 1 and the outer wall of each cutter groove 5, an upper locking screw 6 and a lower locking screw 7 are arranged in the threaded through holes, the pressing block 3 is arranged between the upper locking screw 6 and the blade 2, and the blade 2 is positioned by the pressing block 3.
In order to enable the blade 2 to be in a pre-tightening state in the assembling process, a spring groove 8 which is substantially rectangular is arranged on the inner side face of the pressing block 3 contacted with the pressed face of the blade 2, an arch spring 9 is arranged in the spring groove 8, clamping grooves 81 are respectively formed at the upper end and the lower end of the spring groove 8, clamping heads 91 are formed after the two ends of the arch spring 9 are bent, the clamping heads 91 are clamped in the clamping grooves 81 by virtue of resilience after the two ends of the arch spring 9 deform towards the middle, a pressing part used for being contacted with the pressed face of the blade 2 is formed at the side protruding part of the inner side face of the pressing block 3, and the pressing part of the arch spring 9 is substantially positioned at the middle positions of the upper locking screw 6 and the lower locking screw 7 in.
Because the lateral convex part of the bow spring 9 is arc-shaped, the lateral convex part of the bow spring is contacted with the compression surface of the blade 2 in a tangent mode in the inserting and withdrawing directions, the pressure applying part of the bow spring 9 is higher than the inner side surface of the pressing block 3 in a free state, a gap is reserved between the pressure applying part of the bow spring 9 and the compression surface of the blade 2, the pressure applying part of the bow spring 9 is still higher than the inner side surface of the pressing block 3 after the bow spring 9 is compressed and deformed and is contacted with the compression surface of the blade 2 in a pre-tightening state, the bow spring 9 can be completely accommodated in a space formed by the compression surface of the blade 2 and the spring groove 8 of the pressing block 3 after the bow spring 9 is compressed and deformed in a locking state, and at the moment.
Of course, in other embodiments, only one threaded through hole may be formed between the outer edge of the tool body 1 and the outer wall of each pocket 5, and in the case of only one locking screw, the pressing portion of the bow spring 9 may be aligned with the locking screw in the lateral direction.
The operation of the cutting tool in different states will be described in more detail below.
Referring to fig. 3 and 4 together, fig. 3 is a cross-sectional view of a cutting tool with a pre-tensioned spring according to an embodiment of the present invention in a pre-tensioned state; fig. 4 is a cross-sectional view of a cutting tool with a preloaded spring in a locked state as disclosed in an embodiment of the present invention.
As shown in the figure, in the free state, assuming that the height of the bow spring 9 is H0, the height of the bow spring 9 above the surface of the pressing block 3 is dH0, the distance between the bow spring 9 and the blade bar type blade 2 is G, and the clearance distance between the mating surfaces of the blade bar type blade 2 and the pressing block 3 is C1, the blade bar type blade 2 can freely move in the direction of the guide line of the blade groove 5 and in the radial direction in the blade groove 5.
The locking screw 6 on the rotation advances inwards to push the pressing block 3, the pressing block 3 drives the bow spring 9 to be close to the blade 2 gradually, the bow spring 9 and the blade 2 are in contact with each other when the distance G is equal to 0, and then the locking screw 6 on the rotation continues to advance inwards to compress the bow spring 9 to generate pretightening force to enter a pretightening state.
The height of the bow spring 9 after being pressed and deformed is H2, the deformation is H0-H2, and the magnitude of the pre-tightening force is assumed that the elastic coefficient of the bow spring 9 is K
F＝K(H0-H2) (EQ-1)
The clearance distance between the matching surfaces of the blade 2 and the pressing block 3 is C2, and the following formula is established in combination with the figure 1
H0-H2＝dH0-C 2 (EQ-2)
Namely: the deformation H0-H2 of the bow spring 9 can be adjusted by changing C2, so that the magnitude F of the pretightening force is changed. C2, which is between 0 and dH0, can be adjusted by turning the upper locking screw 6, so that the deformation of the bow spring 9 can provide a pretension F between 0 and K × dH 0.
According to the principle of statics, assuming that the friction coefficient between the blade 2 and the inner side surfaces of the bow spring 9 and the knife groove 5 is mu, the pre-tightening force F provides friction resistance of
f＝μF (EQ-3)
When the frictional resistance f is larger than the component force of the blade 2 in the movement trend direction caused by gravity, the blade 2 in the pre-tightening state is kept still in the cutter groove 5 under the action of no external force, and meanwhile, the blade 2 can move along the direction of the guide line of the cutter groove 5 under the action of the force along the direction of the guide line of the cutter groove 5 to adjust the position.
Obviously, there is a critical condition that the blade 2 moves and does not move in the pocket 5 without external force, i.e., the blade 2 cannot remain stationary in the pocket 5 as soon as the pre-tightening force F is less than the minimum pre-tightening force Fmin.
According to the formulae (EQ-1) and (EQ-2) there are
K(H0-H2)＝K(dH0-C 2)≥Fmin (EQ-4)
This is the pretensioning condition of the blade 2, which is also the design condition of the bow spring 9 and the entire pretensioning device, and the minimum pretensioning force Fmin can be determined experimentally.
Under the pretension state, the blade 2 is adjusted to the required position, and when the locking screw 6 is rotated to push the pressing block 3 to be in contact with the corresponding side surface of the blade 2 (namely C2 is 0), the locking state is about to be entered.
After the upper locking screw 6 is rotated to push the pressing block 3 to be contacted with the corresponding side face of the blade 2, the upper locking screw 6 is rotated with a larger torque to lock, then the lower locking screw 7 is rotated with a larger torque to lock after the lower locking screw 7 is easily rotated to be contacted with the pressing block 3, and the blade 2 is locked by alternately rotating the upper locking screw and the lower locking screw with a larger torque. The blade locking force is ultimately determined by the locking torque of the upper and lower locking screws 6, 7.
The blade locking force needs to be satisfied that the locking screw is still firm enough in one blade sharpening period of the blade 2, wherein the blade sharpening period refers to the quantity of qualified gear workpieces machined by the assembled cutter after the blade 2 is sharpened at one time. The 2 cutting edge wearing and tearing of blade lead to the geometry discrepancy behind the gear work piece of cutter cutting process quantity, and the blade becomes blunt no longer sharp, and blade 2 need dismantle the back sharpening again.
When the blade 2 is disassembled, firstly the lower locking screw 7 rotates reversely to withdraw from the pressing block, then the upper locking screw 6 rotates reversely to withdraw, the pressing block 3 is pushed to separate from the blade 2 under the reaction of the bow spring 9, the bow spring 9 is still contacted with the blade 2 to enter a pre-tightening state, if the blade pre-tightening condition is met, the blade 2 is kept still in the blade groove 5 under the action of no external force, but can be pulled out along the direction of the guide line of the blade groove 5.
With continued reference to fig. 5, fig. 5 is a cross-sectional view of a cutting tool with a pre-tensioned spring according to an embodiment of the present invention, when the cutting tool is assembled, the blade is inserted into the pocket to reach a pre-tensioned state.
As shown in the figure, the clearance distance between the matching surfaces of the blade 2 and the pressing block 3 is C0, the blade 2 is wedged into the compression bow spring 9, the deformation amount of the bow spring 9 is dH1, and dH1 is dH0-C0, if the blade pretension condition is met, i.e. K × dH1 is not less than Fmin, the blade 2 can be inserted into the knife slot 5 to compress the bow spring 9 and enter the pretension state.
Therefore, if the blade 2 is drawn out under the condition of meeting the blade pre-tightening condition when the blade 2 is disassembled, the re-sharpened blade 2 is assembled again under the condition of not rotating the upper and lower locking screws, the blade 2 is inserted into the knife groove 5 to compress the bow-shaped spring 9 spring to enter a pre-tightening state, and the operation can be finished by only one hand.
The above embodiments are merely preferred embodiments of the present invention, and are not limited thereto, and on the basis of the above embodiments, various embodiments can be obtained by performing targeted adjustment according to actual needs. For example, instead of the bow spring 9, a wave spring, a single leaf spring, two leaf springs or a wire spring may be used as the preload spring, and if a leaf spring is used, the leaf spring may be fixedly connected or snapped with the pressure piece at one end in a spring groove, or the like. This is not illustrated here, since many implementations are possible.
According to the invention, the blade 2 is pre-tightened by the pressing block 3 with the pre-tightening spring and the locking screw, so that the blade 2 can enter a pre-tightening state after being inserted into the blade groove 5 during the assembly of the cutter, the operation can be completed by one hand, the cutter installing efficiency is improved, the pre-tightening force can be controlled by adjusting the deformation amount of the pre-tightening spring, the position adjustment of the blade 2 is facilitated, the blade locking force in the locking state is finally determined by the locking torque of the locking screw, and the blade 2 can be continuously and smoothly inserted into and withdrawn from the blade groove 5 because the pressing part of the pre-tightening spring is contacted with the blade 2 in a tangential manner, so that the adjustment.
In addition, the pressing part is formed by the self construction of the pre-tightening spring, other parts such as a steel ball and a check ring do not need to be additionally arranged, the structure is simple, the assembly is easy, the depth of the spring groove 8 is relatively shallow compared with that of the spring hole, and the spring groove can be arranged at an ideal position, so that the cutter blade 2 can be ensured to be in a more reasonable stress state in the pre-tightening state.
In addition to the above cutting tool with preloaded spring, the present invention also provides an assembly method for assembling the above cutting tool, comprising:
the upper locking screw 6 is rotated by a first torque to push the pressing block 3 inwards to advance, and the pressing block 3 drives the bow spring 9 to be in surface contact with the pressed surface of the blade 2.
Before the inner side surface of the pressing block 3 is contacted with the compression surface of the knife strip 2, the compression amount of the bow spring 9 is adjusted, so that the generated pretightening force can prevent the blade 2 from sliding along the guide line direction of the knife groove 5 under the action of no external force, and meanwhile, the position of the blade 2 can be adjusted up and down under the action of the action force along the guide line direction of the knife groove.
After the pressing block 3 advances to the inner side surface to be contacted with the pressed surface of the knife strip 2, the locking screw 6 is rotated through the second torque, and the locking force of the pressing block 3 and the bow spring 9 on the blade 2 is adjusted.
When the locking force and the pretightening force are adjusted or the blade 2 is loosened, the lower locking screw 7 is reversely rotated through a third torque to be withdrawn outwards, the third torque is larger than the second torque, and then the upper locking screw 6 is reversely rotated to be withdrawn.
The cutting tool with preloaded spring and the method of assembling the same according to the present invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A cutting tool with a pre-tightening spring comprises a tool body, wherein tool grooves used for accommodating blades are arranged on the tool body, at least one threaded through hole is formed between the outer edge of the tool body and the outer wall of each tool groove, a locking screw is arranged in each threaded through hole, a pressing block is arranged between each locking screw and each blade, and the blades are positioned through the pressing block. And the pre-tightening spring is pressed and deformed to be completely accommodated in a space formed by the blade pressed surface and the spring groove of the pressing block in a locking state, and the inner side surface of the pressing block is contacted with the pressed surface of the blade.
2. The cutting tool with the preloaded spring as claimed in claim 1, wherein a threaded through hole is formed between the outer edge of the tool body and the outer wall of each pocket, and the pressing portion of the preloaded spring is transversely aligned with the locking screw.
3. The cutting tool with the pre-tightening spring as set forth in claim 1, wherein two threaded through holes are formed between the outer edge of the tool body and the outer wall of each pocket, an upper locking screw and a lower locking screw are respectively disposed in each threaded through hole, and the pressing portion of the pre-tightening spring is substantially located at a middle position of the upper locking screw and the lower locking screw in the vertical direction.
4. The cutting tool with a preloaded spring according to claim 1, wherein one end of said preloaded spring is fixedly attached to said press block within said spring pocket.
5. The cutting tool with a preloaded spring according to claim 1, wherein both ends of said preloaded spring are fixedly attached to said press block within said spring pocket.
6. The cutting tool with the pre-tightening spring as set forth in claim 1, wherein a clamping portion is provided in the spring groove, and both ends of the pre-tightening spring are clamped to the clamping portion of the spring groove.
7. The cutting tool with the pre-tightening spring as set forth in claim 6, wherein the clamping portion is a clamping groove formed at upper and lower ends of the spring groove, clamping tabs are formed at both ends of the pre-tightening spring, and the clamping tabs are clamped in the clamping groove by resilience of the pre-tightening spring after both ends of the pre-tightening spring are deformed toward the middle.
8. The cutting tool with a preloaded spring according to claim 7, wherein said preloaded spring is a bow spring, a wave spring, a leaf spring, or a wire spring that forms a pressing location for contacting the compression surface of said blade with respect to a location that is laterally convex with respect to the inner side surface of said compact.
9. A method of assembling a cutting tool having a preloaded spring for use in assembling a cutting tool according to any of claims 1-8, comprising:
rotating at least one locking screw through a first torque to push the pressing block to move forwards inwards, and driving a pressing part of the pre-tightening spring to be in surface contact with a pressed surface of the blade by the pressing block;
before the inner side surface of the pressing block is advanced to be in contact with the pressed surface of the knife strip, the compression amount of the pre-tightening spring is adjusted, so that the generated pre-tightening force can prevent the blade from sliding along the guide line direction of the knife groove under the action of no external force, and meanwhile, the position of the blade can be adjusted up and down under the action of the action force along the guide line direction of the knife groove;
after the pressing block advances to the inner side surface and contacts with the pressed surface of the cutter bar, the locking screw is rotated through a second torque, and the locking force of the pressing block and the pre-tightening spring on the blade is adjusted.
10. The method of assembling a cutting tool having a preloaded spring of claim 9, wherein at least one of said locking screws is counter-rotated back out by a third torque to adjust a locking force, preload, or unclamp said insert, said third torque being greater than said second torque.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110297570.1A CN112958851B (en) | 2021-03-19 | 2021-03-19 | Cutting tool with pretension spring and method of assembling the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110297570.1A CN112958851B (en) | 2021-03-19 | 2021-03-19 | Cutting tool with pretension spring and method of assembling the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112958851A true CN112958851A (en) | 2021-06-15 |
| CN112958851B CN112958851B (en) | 2023-12-29 |
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| CN202110297570.1A Active CN112958851B (en) | 2021-03-19 | 2021-03-19 | Cutting tool with pretension spring and method of assembling the same |
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Cited By (1)
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| CN114888319A (en) * | 2022-06-08 | 2022-08-12 | 哈尔滨理工大学 | Novel cutter head for machining spiral bevel gear and cutter strip installation and adjustment method |
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|---|---|
| CN112958851B (en) | 2023-12-29 |
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