Deburring fixture

Abstract

A deburring jig including a plurality of compression springs, wherein a combination of the compression springs can be changed. The deburring jig of the present invention includes a main compression spring that receives a load of a deburring tool, a first sub-compression spring that receives the load via a spring-receiving inner cylinder, a second sub-compression spring that has a larger spring constant than the first sub-compression spring and receives the load via a spring-receiving outer cylinder, and a stepped cover. The stepped cover changes the combination of the compression springs among a state in which only the main compression spring receives the load, a state in which the main compression spring and the first sub-compression spring receive the load in parallel, a state in which the main compression spring and the second sub-compression spring receive the load in parallel, and a state in which the main compression spring, the first sub-compression spring, and the second sub-compression spring receive the load in parallel.

Description

TECHNICAL FIELD

[0001] The present invention relates to a deburring jig, and more particularly, to a deburring jig provided with a plurality of compression springs, wherein a combination of the compression springs can be changed according to a type of a workpiece. BACKGROUND

[0002] In order to remove irregular portions of a workpiece surface, a telescopic jig is generally used to remove burrs. Such a telescopic jig can uniformly remove burrs of a workpiece even if the workpiece has an uneven shape, and can cope with a slight load variation. In order to cope with a slight load variation, the telescopic jig should be equipped with a spring having a small spring constant. If a telescopic jig having, for example, a slightly stronger spring constant is required, another telescopic jig having a spring with a different spring constant needs to be prepared. If a plurality of loads are set with a deburring jig having a single spring, the size of the jig becomes impractical because the free length of the used spring becomes too long.

[0003] The applicant of the present invention discloses a tool for removing burrs and chamfers in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2019-198937). In the deburring jig disclosed in Patent Document 1, one jig can set only one load. Therefore, some users prepare four deburring jigs, each of which is equipped with a spring having a mutually different spring constant, for example, set loads of “small”, “medium”, “large”, and “maximum”, and select an appropriate load therefrom. In this way, the user can select a deburring jig having an appropriate load according to a workpiece condition. However, there is a need for a single deburring jig provided with a plurality of loads and capable of responding to a slight load variation. Figure 12

[0004] Figure 13 Another conventional technique for a deburring jig is shown, which adjusts a preload of a deburring jig by changing a length of a single spring. The length of the spring is adjusted by rotating a screw, which is a support portion of the spring, using an adjusting device. As an example, as shown in Figure 14 ​As shown, the preloads are divided into four levels from a to d, and in order to adjust the preloads with a single spring, the deburring jig uses a spring having a large spring constant to avoid a long spring length. In this case, the slope of ΔWT is large, and the spring constant is constant regardless of the preloads. Therefore, even if the preloads are "small" loads indicated by "a", the chamfer width of some workpieces can be changed greatly due to a large load change. In addition, in order to adjust the preloads of a single spring in a large load range, the spring contraction amount needs to be adjusted in a large load intensity range, which increases the number of turns of the adjustment screw. This results in a very time-consuming adjustment process, and it is difficult for the user to determine the current load setting. It is a burden for the operator to perform these tasks without error.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-198937 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The present invention has been made to solve the above problems, and an object of the present invention is to provide a deburring jig provided with a plurality of compression springs, in which the combination of the compression springs can be changed according to the type of workpiece. In other words, an object of the present invention is to provide a deburring jig having a plurality of compression springs with a compact structure, which can significantly improve the adjustment efficiency and can immediately determine the load setting.

[0010] SOLUTION TO THE PROBLEMS

[0011] The deburring jig according to claim 1 is configured such that a deburring tool can be detachably inserted from a lower end of the main body. The deburring jig includes a main compression spring provided inside the main body to directly receive a load from the deburring tool via the main body, one or more auxiliary compression springs to receive the load from the deburring tool through a spring receiving cylinder provided inside the main body, and a stepped cover rotatably provided on the main body to engage or disengage with the spring receiving cylinder, wherein the stepped cover changes the combination of the compression springs between a state in which only the main compression spring receives the load and a state in which the stepped cover engages with the spring receiving cylinder to cause any one or two or more of the auxiliary compression springs to receive the load in parallel with the main compression spring.

[0012] The deburring jig according to claim 2 is configured so that a deburring tool can be detachably inserted from the lower end of the main body. The deburring jig comprises a main compression spring provided inside the main body to directly receive a load from the deburring tool via the main body, a first sub-compression spring receiving the load from the deburring tool through a spring-receiving inner cylinder, a second sub-compression spring receiving the load from the deburring tool through a spring-receiving outer cylinder, wherein the spring constant of the second sub-compression spring is greater than that of the first sub-compression spring, and a stepped cap rotatably provided on the main body to be engaged with or disengaged from the spring-receiving inner cylinder and the spring-receiving outer cylinder. The combination of the compression springs is changed between a state in which only the main compression spring receives the load, a state in which the stepped cap is engaged with the spring-receiving inner cylinder so that the main compression spring and the first sub-compression spring receive the load in parallel, a state in which the stepped cap is engaged with the spring-receiving outer cylinder so that the main compression spring and the second sub-compression spring receive the load in parallel, and a state in which the stepped cap is engaged with the spring-receiving inner cylinder and the spring-receiving outer cylinder so that the main compression spring, the first sub-compression spring, and the second sub-compression spring receive the load in parallel.

[0013] The deburring jig further comprises a long pin provided on the spring-receiving inner cylinder and a short pin provided on the spring-receiving outer cylinder, the spring-receiving inner cylinder being assembled within the spring-receiving outer cylinder. The combination of the compression springs is changed by engagement between any combination of the long pin and the short pin located on the assembled cylinders and grooves formed on the inner surface of the stepped cap. The combination of the grooves is a combination of a shallow groove and a shallow groove, a shallow groove and a deep groove, and a deep groove and a shallow groove.

[0014] The deburring jig further comprises a step spring biasing the stepped cap upward.

[0015] The deburring jig further comprises a dust cover having a dust filter provided on the outside of the lower portion of the main body.

[0016] The deburring jig further comprises a dust cover having a bellows shape provided on the outside of the lower portion of the main body, wherein the dust cover is fixed to the main body at the lower end of the cover to expand and contract with vertical movement of the main body.

[0017] Technical effects of the present invention

[0018] The deburring jig according to claim 1 of the present invention has the following technical effects.

[0019] [a] The deburring jig of the present invention comprises a main compression spring, one or more secondary compression springs that receive a load through a spring receiving cylinder, and a stepped cover that is rotatably provided on the main body to engage or disengage the spring receiving cylinder. The deburring jig can change the combination of the compression springs between a state in which only the main compression spring receives the load and a state in which any one of the secondary compression springs or two or more of the secondary compression springs receive the load in parallel with the main compression spring. This feature allows the user to cope with different loads during deburring without preparing a plurality of deburring jigs.

[0020] [b] The deburring jig of the present invention can accommodate a plurality of springs having different spring constants in a single jig.

[0021] The deburring jig of the present invention as claimed in claim 2 has the following technical effects.

[0022] [a] The deburring jig comprises a first secondary compression spring, a second secondary compression spring, and a stepped cover in addition to the main compression spring. The stepped cover can be used to change the combination of the compression springs between a state in which only the main compression spring is used, a state in which the main spring and the first secondary compression spring are used in parallel, a state in which the main compression spring and the second secondary compression spring are used in parallel, and a state in which the main compression spring, the first secondary compression spring, and the second secondary compression spring are used in parallel.

[0023] [b] Since the first secondary compression spring and the second secondary compression spring are introduced in addition to the main compression spring, the combination strength of the compression springs can be adjusted in four levels. By making the spring constant of the main compression spring small, a compression spring with a weak spring force can be introduced. This makes the deburring jig suitable for workpieces in which the change in the chamfer width is small. The use of compression springs in parallel allows the spring force of the deburring jig to gradually increase. This makes the deburring jig suitable for workpieces in which a spring with a large spring constant is processed.

[0024] [c] The stepped cover is configured to be rotatable, and according to an example, the deburring jig can change the load in four levels by simply rotating the stepped cover by 180° (or by 90° to the left or right). The stepped cover is provided with numbers that indicate the position of the stepped cover after rotation with respect to the handle, so that the user can immediately determine the load during adjustment or use of the deburring jig.

[0025] The deburring fixture according to claim 3 of the present invention has the following technical effects. The deburring fixture includes a long pin disposed on the inner cylinder of the spring receiver and a short pin disposed on the outer cylinder of the spring receiver, wherein the long pin and the short pin are configured to engage with any combination of shallow grooves, shallow grooves and deep grooves, and deep grooves and shallow grooves, wherein these grooves are formed on the inner surface of the stepped cover. This allows the deburring fixture to change the combination of compression springs to be used, thereby achieving the following operation.

[0026] [a] If the long pin engages with the shallow slot and the short pin also engages with the shallow slot, then only the main compression spring extends and contracts.

[0027] [b]If the long pin engages with the deep groove and the short pin engages with the shallow groove, the first auxiliary compression spring and the main compression spring received inside the spring receiving inner cylinder extend and contract in parallel.

[0028] [c] If the long pin engages with the shallow groove and the short pin engages with the deep groove, the second auxiliary compression spring and the main compression spring received inside the spring receiving outer cylinder extend and contract in parallel.

[0029] [d] If the long pin engages with the deep groove and the short pin also engages with the deep groove, the first compression spring received in the inner cylinder of the spring receiving, the second compression spring received in the outer cylinder of the spring receiving, and the main compression spring extend and contract in parallel.

[0030] The technical effect of the deburring fixture according to claim 4 of the present invention is that the stepped cover is configured to be biased upward by a stepped spring, thereby pushing the stepped cover downward to disengage the long pin or short pin from the groove, thereby releasing the engagement between the stepped cover and the spring receiving cylinder. Pushing the stepped cover downward can rotate the stepped cover.

[0031] The technical effect of the deburring fixture according to claim 5 of the present invention is that the deburring fixture has a dust cover provided on the outer side of the lower part of the main body and equipped with a dust filter, thereby preventing iron powder from entering the gap between the movable main body and the lower end of the handle.

[0032] The technical advantage of the deburring fixture according to claim 6 of the present invention is that the deburring fixture has a dust cover with a corrugated tube shape disposed on the outer side of the lower part of the main body, and the dust cover is fixed to the main body at its lower end. This allows the dust cover to extend and retract with the vertical movement of the main body, thereby preventing iron powder from entering the gap between the main body and the lower end of the handle. Attached Figure Description

[0033] Figure 1 (a) Figure 1 (b) andFigure 1 (c) illustrates the overall structure of the deburring fixture of the present invention. Figure 1 (a) shows along Figure 1 (b) Cross-sectional view of line A-A' in (b); Figure 1 (b) shows along Figure 1 (a) is a cross-sectional view of line B-B'; and, Figure 1 (c) shows an external view of the upper side surface of the stepped cover;

[0034] Figure 2 (a) and Figure 2 (b) shows Figure 1 A schematic diagram of the inner and outer cylinders of the spring receiver. Wherein, Figure 2 (a) shows an external view of the inner and outer spring receiving cylinders before assembly. Figure 2 (b) shows a schematic diagram of the state in which the inner cylinder of the spring receiver has been inserted into the outer cylinder of the spring receiver;

[0035] Figure 3 The handle is shown, in which the [missing information] has been removed. Figure 1 The stepped cover shown;

[0036] Figure 4 A schematic diagram showing the state in which the inner spring receiver cylinder has been inserted into the outer spring receiver cylinder, an external view of the stepped cover, and a schematic diagram of the upper side surface of the stepped cover are shown.

[0037] Figure 5 A schematic diagram of the deburring fixture of the present invention is shown in the case where only the main compression spring is used for operation;

[0038] Figure 6 A schematic diagram is shown showing the deburring fixture of the present invention operating using a main compression spring and a first auxiliary compression spring;

[0039] Figure 7 A schematic diagram of the deburring fixture of the present invention is shown, illustrating the operation of a main compression spring and a second auxiliary compression spring.

[0040] Figure 8 A schematic diagram of the deburring fixture of the present invention is shown, illustrating the operation of a main compression spring, a first auxiliary compression spring, and a second auxiliary compression spring.

[0041] Figure 9 A graph showing the relationship between load (N) and shrinkage (mm) of the deburring fixture of the present invention is shown.

[0042] Figure 10 This demonstrates how to achieve the combination of the main compression spring, the first auxiliary compression spring, and the second auxiliary compression spring.

[0043] Figure 11 (a) and Figure 11 (b) shows the installation status of the dust cover. Among them, Figure 11 (a) shows a schematic diagram of a dust filter being mounted on a dust cover; and... Figure 11 (b) shows a schematic diagram of the dust cover being constructed in a corrugated shape;

[0044] Figure 12 An example of a conventional deburring fixture is shown, wherein four deburring fixtures are shown, each with a spring having a different spring constant;

[0045] Figure 13 An example of a conventional deburring fixture is shown, in which the preload of the deburring fixture is adjusted by changing the length of a single spring;

[0046] Figure 14 The diagram shows the relationship between contraction (mm) and load (N) when multiple preloads are applied to a single spring in an example of a conventional deburring fixture. Detailed Implementation

[0047] Example

[0048] The deburring fixture of the present invention will now be described in detail with reference to the accompanying drawings. Figures 1-11 The deburring fixture shown includes a main compression spring and two auxiliary compression springs, with four load levels that can be set.

[0049] Figure 1 (a) Figure 1 (b) and Figure 1 (c) shows the overall structure of the deburring fixture 100 of the present invention. Figure 1 (a) shows along Figure 1 (b) shows a cross-sectional view of line A-A'. Figure 1 (b) shows along Figure 1 (a) is a cross-sectional view of line B-B'. Figure 1(c) shows an external view of the upper side surface of the stepped cap. The deburring fixture 100 is equipped with a deburring tool 21 via a tapered chuck 20 and a nut 19 located at the lower end of the body 2. The upward load from the workpiece received by the deburring tool is transmitted to the main compression spring 9 via the tapered chuck 20 and the body 2 that clamp the deburring tool. An adjusting screw 18 is used to adjust the cutting edge position of the deburring tool 21, but may not be used if the shank is long. Since the top of the main compression spring 9 is held by the shank cap 8, the main compression spring 9 contracts when an upward load is applied to it and extends when the upward load is removed. The load from the deburring tool 21 is received by the body 2. The body 2 is a movable part that is pushed upward by the load when the main compression spring 9 contracts and pushed downward when the main compression spring 9 rebounds.

[0050] In this embodiment, in addition to the main compression spring 9, there are also a first auxiliary compression spring 10 and a second auxiliary compression spring 11. The spring constant of the main compression spring 9 is k1, the spring constant of the first auxiliary compression spring 10 is k2, and the spring constant of the second auxiliary compression spring 11 is k3. The first auxiliary compression spring 10 and the second auxiliary compression spring 11 are stacked on the shaft of the handle cover 8 with the first auxiliary compression spring 10 on the inside and the second auxiliary compression spring 11 on the outside. The first auxiliary compression spring 10 and the second auxiliary compression spring 11 are provided with coils wound in opposite directions to prevent the springs from tangling together and getting stuck. The main compression spring 9, the first auxiliary compression spring 10, and the second auxiliary compression spring 11 are covered by the handle portion 1.

[0051] The first compression spring 10 is received by the inner spring receiving cylinder 6. The second compression spring 11 is received by the outer spring receiving cylinder 7. The inner spring receiving cylinder 6 and the outer spring receiving cylinder 7 are collectively referred to as the spring receiving cylinders. At the bottom of the inner spring receiving cylinder 6, two long pins 15 protrude from both sides of the cylinder. At the bottom of the outer spring receiving cylinder 7, two short pins 16 protrude from both sides of the cylinder. A stepped cover 3 for changing the spring combination is provided on the lower side of the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7. The stepped cover 3 is biased upward by the stepped spring 12. Therefore, the stepped cover 3 can be manually pushed downward. Pushing the stepped cover 3 downward causes the stepped cover 3 to engage or disengage from the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7. A cover 4 is provided on the lower side of the stepped spring 12. A dust cover 5 is provided so that its lower part covers the main body 2. A dust filter 13 is provided on the dust cover 5. A steel ball 14 is provided on the handle 1.

[0052] Figure 1 (b) shows along Figure 1 (a) shows a cross-sectional view of line B-B'. Figure 1(b) A cross-section of the stepped cover 3 is shown. On the outer surface of the stepped cover 3, numbers [1]-[4] indicating level number 23 are printed. The level number is surrounded by a square and, viewed from the bottom, is printed counterclockwise in the order [1], [2], [4], [3], [1], [2], [4], [3]. The inner surface of the stepped cover 3 has eight semi-circular grooves spaced at 45° intervals, corresponding to the printed level numbers. The semi-circular grooves consist of shallow and deep grooves. If the long pin 15 engages with the shallow groove, the spring receiving inner cylinder 6 cannot descend within the stepped cover 3, thus preventing the operation of the first compression spring 10. If the long pin 15 engages with the deep groove, the spring receiving inner cylinder 6 descends within the stepped cover 3 to contact the upper end of the body 2, causing the first compression spring 10 to extend and retract. Similarly, if the short pin 16 engages with the shallow groove, the operation of the second compression spring 11 is prevented. If the short pin 16 engages with the deep groove, the second compression spring 11 can extend and retract.

[0053] Figure 1 (c) shows an external view of the upper side of the stepped cap 3. A triangular mark 22 is printed on the outer surface of the upper part of the handle 1, and the printing number [1] indicating the level number 23 on the stepped cap 3 is aligned with the triangular mark 22. In this case, as... Figure 1 As shown in (b), the long pins 15, 15 engage with the grooves on the inner surface of the stepped cover 3 corresponding to the printed numbers [1], [1], and the short pins 16, 16 engage with the grooves on the inner surface of the stepped cover 3 corresponding to the printed numbers [3], [3].

[0054] Figure 2 (a) and Figure 2 (b) shows Figure 1 (a) is a schematic diagram of the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7. Figure 2 (a) is an external view of the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7 before assembly. Figure 2 (b) shows the state where the inner spring receiving cylinder 6 has been inserted into the outer spring receiving cylinder 7. Since the outer spring receiving cylinder 7 has a slit for receiving the long pins 15, the inner spring receiving cylinder 6 with the long pins 15 can be inserted into the outer spring receiving cylinder 7. With the inner spring receiving cylinder 6 inserted into the outer spring receiving cylinder 7, the two long pins 15, 15 pass through both sides of the outer spring receiving cylinder 7 and protrude outwards, while the two short pins 16, 16 protrude at a 45° angle from the long pins 15, 15 on both sides of the outer spring receiving cylinder 7.

[0055] Figure 3The handle 1 is shown, in which the stepped cap 3 has been removed. The handle 1 has four slots from which the long pins 15, 15 and the short pins 16, 16 can protrude. The long pins 15, 15 and the short pins 16, 16 can move along the four slots. A triangular mark 22 is imprinted on the handle 1, indicating the load during deburring. Figure 3 In the middle, the long pin 15 protrudes at the position corresponding to the triangular mark 22, and the short pin 16 protrudes at a 45° interval from the long pin 15. After the inner cylinder 6 and the outer cylinder 7 of the spring receiver are assembled, the positional relationship between the triangular mark 22, the long pin 15 and the short pin 16 will not change.

[0056] Figure 4 A schematic diagram showing the spring receiving inner cylinder 6 inserted into the spring receiving outer cylinder 7, an external view of the stepped cover 3, and a view of the upper side surface of the stepped cover 3 are shown. Viewed from the top, level numbers 23 are printed clockwise on the outer surface of the stepped cover 3 in the order [1], [2], [4], [3], [1], [2], [4], [3]. Printed numbers [1] and [3] correspond to shallow slots, and printed numbers [2] and [4] correspond to deep slots. With the spring receiving inner cylinder 6 and spring receiving outer cylinder 7 assembled, the printed number [1] of level number 23 on the stepped cover 3 is aligned with the triangular mark 22. Therefore, long pins 15, 15 engage with the shallow slots, and short pins 16, 16 engage with the shallow slots.

[0057] Rotate the stepped cover 3 in 45° increments while simultaneously pulling it downwards against the biasing force of the step spring 12, aligning any one of the printed numbers [1] to [4] of level 23 on the stepped cover 3 with the triangular mark 22 on the handle 1. This changes the four load levels shown in Table 1. How to change the four load levels will be explained below.

[0058] Table 1

[0059]

[0060] Figure 5This illustrates the deburring fixture 100 of the present invention in the case where only the main compression spring 9 is in operation. The printed number [1] on the stepped cover 3 is aligned with the triangular mark 22. The load in Table 1 is set to small (weak). The main compression spring 9 is a small spring with a spring constant of k1. On the inner surface of the stepped cover 3, shallow grooves are located at positions corresponding to printed numbers [1] and [3], while deep grooves are located at positions corresponding to printed numbers [2] and [4]. If the stepped cover 3 is rotated and the printed number [1] is aligned with the triangular mark 22, as shown in section B-B', the long pins 15, 15 enter the shallow grooves corresponding to printed numbers [1], [1], while the short pins 16, 16 enter the shallow grooves corresponding to printed numbers [3], [3]. Therefore, when the long pins 15, 15 and the short pins 16, 16 enter the shallow grooves respectively, the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7 are both kept outside the range of movement of the main body 2 in the vertical direction. Therefore, only the main compression spring 9 receives the load from the deburring tool 21. Figure 5 As shown in section A-A', only the main compression spring 9 contracts due to the load from the deburring tool 21, and the body 2 also rises. However, since the inner spring receiving cylinder 6 and the outer spring receiving cylinder 7 are blocked by the shallow groove on the inner surface of the stepped cover 3 and do not contact the body 2, the first auxiliary compression spring 10 and the second auxiliary compression spring 11 do not work.

[0061] Figure 6 The main compression spring 9 and the first auxiliary compression spring 10 of the deburring fixture 100 are shown working together. The printed number [2] on the stepped cover 3 is aligned with the triangle mark 22. The load in Table 1 is set to medium (normal). The spring constant of the main compression spring 9 is k1, and the spring constant of the first auxiliary compression spring 10 is k2, where the value of k2 is greater than the value of k1 (k1 < k2). On the inner surface of the stepped cover 3, shallow grooves are located at positions corresponding to printed numbers [1] and [3], while deep grooves are located at positions corresponding to printed numbers [2] and [4]. If the stepped cover 3 is rotated and the printed number [2] is aligned with the triangle mark 22, as shown in section B-B', the long pins 15, 15 enter the deep grooves corresponding to printed numbers [2], [2], and the short pins 16, 16 enter the shallow grooves corresponding to printed numbers [1], [1]. If the long pins 15, 15 enter the deep groove, the inner spring receiving cylinder 6 descends until it contacts the top of the body 2. If the short pins 16, 16 enter the shallow groove, the outer spring receiving cylinder 7 is held outside the vertical range of movement of the body 2. Therefore, the main compression spring 9 and the first auxiliary compression spring 10 are configured to receive the load from the deburring tool 21 in parallel. Figure 6As shown in section A-A', the load from the deburring tool 21 causes the main compression spring 9 and the first auxiliary compression spring 10 to contract. If the body 2 rises, the body 2 does not contact the spring receiving outer cylinder 7, therefore the second auxiliary compression spring 11 does not work.

[0062] Figure 7 The deburring clamp 100 is shown in the case where the main compression spring 9 and the second compression spring 11 work together. The printed number [3] on the stepped cover 3 is aligned with the triangle mark 22. The load in Table 1 is set to large (strong). The spring constant of the main compression spring 9 is k1, the spring constant of the first compression spring 10 is k2, and the spring constant of the second compression spring 11 is k3, where the value of k3 is greater than the value of k2 (k2 < k3). On the inner surface of the stepped cover 3, shallow grooves are located at the positions corresponding to the printed numbers [1] and [3], while deep grooves are located at the positions corresponding to the printed numbers [2] and [4]. If the stepped cover 3 is rotated and the printed number [3] is aligned with the triangle mark 22, as shown in section B-B', the long pins 15, 15 enter the shallow grooves corresponding to the printed numbers [3], [3], and the short pins 16, 16 enter the deep grooves corresponding to the printed numbers [4], [4]. If the long pins 15, 15 enter the shallow groove, the inner spring receiving cylinder 6 is held outside the vertical movement range of the body 2. If the short pins 16, 16 enter the deep groove, the outer spring receiving cylinder 7 descends until it contacts the top of the body 2. Therefore, the main compression spring 9 and the second auxiliary compression spring 11 are configured to receive the load from the deburring tool 21 in parallel. Figure 7 As shown in section A-A', the load from the deburring tool 21 causes the main compression spring 9 and the second auxiliary compression spring 11 to contract. If the body 2 rises, the body 2 does not contact the spring receiving inner cylinder 6, therefore the first auxiliary compression spring 10 does not operate.

[0063] Figure 8The deburring clamp 100 is shown in the case where the main compression spring 9, the first auxiliary compression spring 10, and the second auxiliary compression spring 11 work together. The printed number [4] on the stepped cover 3 is aligned with the triangle mark 22. The load in Table 1 is set to maximum (strong). The spring constant of the main compression spring 9 is k1, the spring constant of the first auxiliary compression spring 10 is k2, and the spring constant of the second auxiliary compression spring 11 is k3, where the value of k3 is greater than the value of k2 (k2 < k3). On the inner surface of the stepped cover 3, the shallow groove is located at the position corresponding to the printed numbers [1] and [3], while the deep groove is located at the position corresponding to the printed numbers [2] and [4]. If the stepped cover 3 is rotated and the printed number [4] is aligned with the triangle mark 22, then as shown in section B-B', the long pins 15, 15 enter the deep groove corresponding to the printed numbers [4], [4], and the short pins 16, 16 enter the deep groove corresponding to the printed numbers [2], [2]. If the long pins 15, 15 enter the deep groove, the inner spring receiving cylinder 6 descends until it contacts the top of the body 2. If the short pins 16, 16 enter the deep groove, the outer spring receiving cylinder 7 also descends until it contacts the top of the body 2. Therefore, the main compression spring 9, the first auxiliary compression spring 10, and the second auxiliary compression spring 11 are configured to receive the load from the deburring tool 21 in parallel. Figure 8 As shown in section A-A', the load from the deburring tool 21 causes the main compression spring 9, the first auxiliary compression spring 10, and the second auxiliary compression spring 11 to contract.

[0064] Figure 9 A graph showing the relationship between load (N) and shrinkage (mm) of the deburring fixture 100 according to the present invention is shown. a', b', c' and d' correspond to the printed numbers indicated by triangles shown in Table 1 [1], [2], [3] and [4], respectively. In a', where only the main compression spring 9 is used, the slope is small because the spring constant k1 of the main compression spring 9 is small, and therefore ΔWk is small. In b', where the main compression spring 9 and the first auxiliary compression spring 10 are used in parallel, the slope is greater than that of a'. In c', where the main compression spring 9 and the second auxiliary compression spring 11 are used in parallel, the slope is greater than that of b'. In d', where the main compression spring 9, the first auxiliary compression spring 10 and the second auxiliary compression spring 11 are used in parallel, the slope is greater than that of c'. When a preload is applied to the springs in a', b', c' and d', the preload of the main compression spring 9 can be controlled by rotation. Figure 1 Adjust using the adjusting screw 18 shown.

[0065] Figure 10Shows a combination of the main compression spring 9, the first sub-compression spring 10, and the second sub-compression spring 11. The symbols a', b', c', and d' respectively correspond to the printed numbers [1], [2], [3], and [4] represented by triangular marks shown in Table 1. If the spring constants of the main compression spring 9, the first sub-compression spring 10, and the second sub-compression spring 11 are k1, k2, and k3 respectively, then the spring constants of a', b', c', and d' are k1, k1 + k2, k1 + k3, and k1 + k2 + k3 respectively, because the springs are used in parallel. Since k2 < k3, the spring constant can increase gradually.

[0066] Figure 11 (a) and Figure 11 (b) show the installation of the dust cover 5. Figure 11 (a) is Figure 1 a cross-sectional view of the lower part of the deburring jig 100 in, where a dust filter 13 is provided on the dust cover 5. Figure 11 (b) shows the case where the dust cover 5 is configured to have a bellows shape. The handle portion 1 extends downward to cover the lower side of the main body 2. Since the main body 2 is a movable member that extends and retracts according to the load from the deburring tool 21, fine powders such as iron powder generated by deburring will enter the small gap between the lower end of the handle portion 1 and the main body 2. In Figure 11 (a), a dust cover 5 with a dust filter 13 is provided on the outside of the lower part of the main body 2. This causes the iron powder to be adsorbed by the dust filter 13 and prevents the powder from entering the gap between the lower end of the handle portion 1 and the main body 2. In Figure 11 (b), a dust cover 5 configured to have a bellows shape is provided, where the lower end of the dust cover 5 is fixed to the main body 2. The bellows shape enables the dust cover 5 to extend and contract with the vertical movement of the main body 2 and, in parallel, prevents iron powder from entering the gap between the handle portion 1 and the main body 2. No load is applied at the position where the lower end of the dust cover 5 is fixed to the main body 2.

[0067] In this embodiment ( Figures 1-11 ), the deburring jig 100 is provided with three springs, including the main compression spring 9, the first sub-compression spring 10, and the second sub-compression spring 11; however, the deburring jig 100 may include only two springs: the main compression spring 9 and the first sub-compression spring 10. In this case, the load of the deburring jig 100 is set to two levels, and the spring receiving cylinder is formed by a single cylinder. The deburring jig 100 may include the main compression spring 9 and three sub-compression springs. In this case, the load of the deburring jig 100 is set to eight levels, where the spring receiving cylinder is composed of an inner cylinder, a middle cylinder, and an outer cylinder.

[0068] Industrial Applicability

[0069] This invention provides a deburring fixture equipped with multiple compression springs, wherein the combination of compression springs can be changed according to the type of workpiece. The deburring fixture is mounted on a machine tool or robot in a machining center.

[0070] Explanation of reference numerals in the attached figures

[0071] 1. Handle

[0072] 2 main bodies

[0073] 3-step cover

[0074] 4 lids

[0075] 5 dust covers

[0076] 6-Spring Receiver Inner Cylinder

[0077] 7 Spring Receiving Outer Cylinder

[0078] 8 handles

[0079] 9 main compression springs

[0080] 10 First Compression Spring

[0081] 11 Second compression spring

[0082] 12-step spring

[0083] 13 Dust Filter

[0084] 14 steel balls

[0085] 15 Long-term Sales

[0086] 16 short sales

[0087] 17 positioning screws

[0088] 18 Adjusting Screws

[0089] 19 nuts

[0090] 20 conical chuck

[0091] 21 Deburring tools

[0092] 22 triangle markers

[0093] Level 23 numbering

[0094] 24 slots in the handle

[0095] 25-step cover groove

[0096] 25a Shallow Trench

[0097] 25b deep groove

[0098] 100 deburring fixture.

Claims

1. A deburring fixture, wherein, A deburring tool is detachably inserted into the deburring jig from the lower end of the main body, the deburring jig comprising: a main compression spring provided inside the main body to directly receive a load from the deburring tool via the main body; one or more secondary compression springs receiving a load from the deburring tool via a spring receiving cylinder provided inside the main body; and a stepped cap rotatably provided on the main body to engage with or disengage from the spring receiving cylinder, the stepped cap capable of changing a combination of the compression springs between a state where only the main compression spring receives the load and a state where the stepped cap engages with the spring receiving cylinder to cause any one or two or more of the secondary compression springs to receive the load in parallel with the main compression spring.

2. A deburring fixture wherein, A deburring tool is detachably inserted into the deburring jig from the lower end of the main body, the deburring jig comprising: a main compression spring provided inside the main body to directly receive a load from the deburring tool via the main body; a first secondary compression spring receiving a load from the deburring tool via a spring receiving inner cylinder; a second secondary compression spring receiving a load from the deburring tool via a spring receiving outer cylinder, the second secondary compression spring having a spring constant greater than that of the first secondary compression spring; and a stepped cap rotatably provided on the main body to engage with or disengage from the spring receiving inner cylinder and the spring receiving outer cylinder, the stepped cap capable of changing a combination of the compression springs between a state where only the main compression spring receives a load, a state where the stepped cap engages with the spring receiving inner cylinder to cause the main compression spring to receive the load in parallel with the first secondary compression spring, a state where the stepped cap engages with the spring receiving outer cylinder to cause the main compression spring to receive the load in parallel with the second secondary compression spring, and a state where the stepped cap engages with the spring receiving inner cylinder and the spring receiving outer cylinder to cause the main compression spring to receive the load in parallel with the first secondary compression spring and the second secondary compression spring.

3. The deburring fixture of claim 2, wherein: Further comprising a long pin provided on the spring receiving inner cylinder and a short pin provided on the spring receiving outer cylinder, the spring receiving inner cylinder assembled inside the spring receiving outer cylinder; wherein the combination of the compression springs is changed by engagement of either one of the long pin and the short pin on the assembled cylinder with a combination of grooves formed on an inner surface of the stepped cap, the combination of grooves being a combination of a shallow groove and a shallow groove, a shallow groove and a deep groove, and a deep groove and a shallow groove.

4. The deburring fixture of claim 3, wherein: Further comprising a step spring biasing the stepped cap upward.

5. The deburring fixture of claim 2, wherein: Further comprising a dust cover provided on an outer side of a lower portion of the main body and having a dust filter.

6. The deburring fixture of claim 2, wherein: Further comprising a dust cover provided on an outer side of a lower portion of the main body and having a bellows shape, the dust cover fixed to the main body at a lower end thereof to expand and contract with vertical movement of the main body. Further comprising a dust cover provided on an outer side of a lower portion of the main body and having a bellows shape, the dust cover fixed to the main body at a lower end thereof to expand and contract with vertical movement of the main body.

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