TWI674936B - Stud with a stable combination of sliders - Google Patents

Abstract

The utility model relates to a shank of a slider with a stable combination, which comprises a shank body and a slider that are screwed together; the connecting portion of the shank body includes an internal thread portion and a straight portion; the slider includes a head portion and a stopper. And an external thread portion; the abutment portion includes a flange and an extension portion, the extension portion is matched with the straight portion gap, and a seal is used to close the gap; the external thread portion is screwed with the internal thread portion It includes a first thread segment and a second thread segment. The first thread segment is located at an end away from the head of the slider, and the processing accuracy of the second thread segment is better than the first thread segment.

Description

Knife bar with firmly combined slider

The invention relates to a tool bar of a processing machine, in particular to a tool bar having a slider.

Please refer to FIG. 6 and FIG. 7. The existing tool bar 90 mainly uses a screw head 92 that is screwed to the top of the tool bar body 91 and a clamping device 81 in the main shaft 80 of the processing machine to clamp and fix the tool bar. 90 can be driven by the rotation of the main shaft 80 for processing operations.

The existing slider 92 mainly includes a head 921, a flange 922, and an externally threaded portion 923. The head 921 and the externally threaded portion 923 are respectively disposed at opposite ends of the slider 92, and the diameter of the flange 922 It is convexly arranged and forms a space between the head 921 and the external thread portion 923. The external thread portion 923 of the slider 92 is screwed with the internal thread portion 911 of the tool holder body 91 and abuts against the flange 922. The head 921 stops at the end surface of the shank body 91 to position the connection position between the shank body 91 and the slider 92 so that the head 921 is protruded from the end surface of the shank body 91.

The existing thread standards can be divided into metric thread standards and inch thread standards, and their mating levels are roughly divided into loose fit, intermediate fit and precision fit. Among them, the machining accuracy grades of the external threads of the British thread standard are divided into 1A, 2A and 3A. Internal thread machining accuracy grades are divided into 1B, 2B and 3B grades. The higher the grade number, the tighter the fit. The machining accuracy grades of the internal and external threads of the tool body 91 and the slider 92 are usually 2A and 2B. The tolerance position of the external thread of the metric thread standard is divided into e, g, and h, and the tolerance position of the internal thread is divided into G, H. The basic deviation of H and h is zero, and the basic deviation of G is positive. , The basic deviation of e, g is negative, and the accuracy level is represented by a number, the higher the number, The lower the representative accuracy level, the machining accuracy level of the tool body 91 and the slider 92 is usually 6H / 6g intermediate thread.

However, the existing connection between the tool holder body 91 and the slider 92 is only based on the screw connection of the internal and external thread portions 911 and 923, which is an intermediate fit. It is affected by the allowable internal and external thread clearance. If the tightening torque between 91 and the slider 92 is too small, the connection between the cutter body 91 and the slider 92 is not stable, and it is easy to loosen and shake. If the tightening torque between the cutter body 91 and the slider 92 is too large, The connection between the slider 92 and the tool holder body 91 will be affected by the thread clearance, and the connection between the slider 92 and the tool holder body 91 will be eccentric, which will cause the tool holder 90 to deflect easily when it rotates and affect the processing accuracy of the processing machine. improve.

In view of this, the main object of the present invention is to provide a tool bar, whose assembly between the slider and the tool body is more stable, and the deflection during the rotation of the tool bar is reduced to improve the processing accuracy of the processing machine.

In order to achieve the above-mentioned object, the present invention provides a shank with a firmly combined slider, which includes a shank body including an end surface; and a connecting portion formed axially in the shank body and in the shank body. The end surface forms an opening, which includes an internal thread portion and a straight portion having the same axis. The internal thread portion is provided on a side far from the end surface. The machining accuracy specification of the internal thread portion is in accordance with a standard thread specification. A straight portion is formed between the internally threaded portion and the end surface; and A slider is screw-connected to the cutter body, and includes a head, an abutment portion, and an external thread portion. The head and the external thread portion are respectively disposed at opposite ends of the slider. An abutment portion is formed between the head portion and the external thread portion; wherein the abutment portion includes a flange radially protruding from the slider, and an end away from the head portion abuts an end surface of the cutter body. An extension is inserted in the connection part of the tool bar body and fits with the straight part; a ring groove is radially recessed in the extension; and a seal is provided in the ring groove and closed The gap between the extension of the slider and the straight portion of the shank body; and the externally threaded portion is screwed to the internally threaded portion of the shank body and includes a first thread section located away from the head One end of the part, the processing accuracy specification of the first thread segment is in accordance with the standard thread specification, and the thread fit of the first thread segment and the internal thread part is an intermediate fit of the standard thread specification; a second thread Segment, located near the end of the head, the machining accuracy specification of the second thread segment In accordance with the specifications of the standard threads, and the machining accuracy of machining accuracy takes precedence over the level of the first thread segments; and a separating slot, radially recessed in the first thread segments between the second thread segments.

With the above technical features, the seal can eliminate the gap between the slider and the body of the cutter bar, increase the stability of the combination, absorb vibration, and have water-stopping effect; and the two-stage machining accuracy of the external thread of the slider Level, which allows the screwing process of the slider and the tool body to become tighter and tighter, and reduces the deviation of the connection position during the locking process, which can reduce the tightening torque between the tool body and the slider. The eccentricity generated when the force is too large reduces the yaw and vibration of the tool bar during high-speed rotation, and improves the machining accuracy and service life of the tool bar.

10‧‧‧Body holder

11‧‧‧face

13‧‧‧Connecting Department

131‧‧‧ Internal thread

132‧‧‧Groove

133‧‧‧Straight

20, 20A‧‧‧ slider

21‧‧‧Head

22‧‧‧Arrival Department

221‧‧‧ flange

222‧‧‧ extension

223‧‧‧Circle trench

23‧‧‧External thread

231‧‧‧first thread section

232‧‧‧Second thread section

233‧‧‧Slotted

24‧‧‧through hole

25‧‧‧seals

T1‧‧‧Thread clearance

T2‧‧‧Thread clearance

80‧‧‧ Spindle

81‧‧‧Clamping device

90‧‧‧tool bar

91‧‧‧Body body

911‧‧‧ Internal thread

92‧‧‧ slider

921‧‧‧Head

922‧‧‧ flange

923‧‧‧External thread part

FIG. 1 is an exploded perspective view of a preferred embodiment of the present invention.

Fig. 2 is a sectional side view of a preferred embodiment of the present invention.

FIG. 3 is a partially enlarged sectional side view of the abutment portion according to the preferred embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional side view of a male screw portion according to a preferred embodiment of the present invention.

Fig. 5 is a sectional side view of another preferred embodiment of the present invention.

Fig. 6 is a sectional side view of a conventional cutter bar.

FIG. 7 is a schematic diagram showing the use of a conventional cutter bar.

Please refer to FIG. 1 and FIG. 2. The shank of the slider with a stable combination of the present invention includes a shank body 10 and a slider 20; the shank body 10 includes an end surface 11 and a connecting portion 13; The connecting portion 13 is formed axially in the tool body 10 and forms an opening in the end surface 11. The connecting portion 13 includes an internal thread portion 131 and a straight portion 133 having the same axis. The internal thread portion 131 is located away from the end surface. One side of 11 is provided with an internal thread. The processing accuracy specification of the internal thread portion 131 is in accordance with the specifications of the British standard thread. Its processing accuracy grade is 2B grade of the British standard internal thread. The straight portion 133 is formed on the internal thread. Between the portion 131 and the end surface 11, and the straight portion 133 is a circular groove coaxial with the internally threaded portion 131, preferably, a groove 132 is provided between the straight portion 133 and the internally threaded portion 131. The groove 132 is radially recessed in the cutter body 10 to facilitate processing and assembly.

The slider 20 is screwed with the tool body 10 and includes a head 21, an abutment portion 22, an externally threaded portion 23, and a through hole 24; the head 21 and the externally threaded portion 23 are respectively Formed in the At the opposite ends of the slider 20, the abutment portion 22 is formed between the head 21 and the external thread portion 23, and the through hole 24 is axially penetrated through the slider 20 to facilitate installation in the built-in cutting Machining system of the hydraulic system, allowing cutting fluid from the machining machine to enter the tool holder body 10 through the through hole 24 and cool and lubricate the tool; please refer to FIG. 5, the slider 20A may not be provided with the through hole 24 , And suitable for processing machines without cutting fluid system.

With reference to FIG. 2 and FIG. 3, the abutting portion 22 includes a flange 221, an extending portion 222, a ring groove 223, and a seal 25. The flange 221 protrudes radially from the slider 20, and an end of the flange 221 facing away from the head 21 abuts against the end surface 11 of the cutter body 10. The extension 222 is a cylinder, which extends axially from an end of the flange 221 away from the head 21 and is inserted into the connecting portion 13 of the shank body 10. The outer diameter of the extension 222 is slightly smaller than The inner diameter of the straight portion 133 is dimensioned to form a clearance fit with the straight portion 133. The ring groove 223 is radially recessed in the extension portion 222; the seal member 25 is an O-ring elastic body, and is arranged in the ring groove 223, and a part of the surface of the seal member 25 is slightly convex in a natural state. The extension portion 222 interferes with the straight portion 133, and closes the gap between the extension portion 222 and the straight portion 133. By the arrangement of the abutting portion 22, the cutter body 10 and the pulling portion can be increased The stability of the connection of the head 20 absorbs vibration and avoids shaking, and prevents the cutting fluid from overflowing from the gap between the cutter body 10 and the slider 20 to achieve a water-stopping effect.

Please refer to FIG. 2 and FIG. 4 for reference. The external thread portion 23 is screwed with the internal thread portion 131, and includes a first thread segment 231, a second thread segment 232, and a separation slot 233. A thread segment 231 is located at an end away from the head 21, and the processing accuracy specification of the first thread segment 231 is in accordance with the specifications of the British standard thread, and the processing accuracy grade is 2A grade of the British standard external thread, so that the first The threaded fit of the threaded segment 231 and the internal threaded portion 131 is an intermediate fit in the British thread standard; the second threaded segment 232 is located at an end close to the head 21, and the processing accuracy level of the second threaded segment 232 is the English standard Grade 3A of the external thread makes the processing accuracy level of the second thread segment 232 better than the processing accuracy level of the first thread segment 231, and the thread gap T2 between the second thread segment 232 and the internal thread portion 131 is smaller than that of the first thread segment. A thread gap T1 between a thread segment 231 and the internal thread portion 131; the separation slot 233 is radially recessed in Between the first threaded section 231 and the second threaded section 232, the external threaded portion 23 can be processed with different accuracy.

Taking the internal and external threads of the inch standard thread with an outer diameter of 5/8 inch as an example, when the machining accuracy level of the internal thread is 2B, the maximum allowable size of the thread cross-section is 0.5732 inches, and the tolerance value is 0.0072 inches. When the external thread processing accuracy level is 2A, the minimum allowable thread cutting diameter is 0.5588 inches, and the tolerance value is 0.0055 inches. When the external thread processing accuracy level is 3A, the minimum allowable thread cutting diameter is 0.5619 inches. Inches, the tolerance value is 0.0041 inches, so the maximum thread clearance T1 at the thread cross-section of the internal thread portion 131 and the first thread segment 231 is 0.0144 inches, the minimum thread clearance is 0.0017 inches, and the tolerance value is 0.0127 inches , The maximum thread clearance T2 at the thread cross-section of the internal thread portion 131 and the second thread segment 232 is 0.0113 inches, the minimum thread clearance is 0 inches, and the tolerance value is 0.0113 inches, so that the second thread segment 232 and the internal thread The screwing of the threaded portion 131 is relatively tight, and the screwing process of the slider 20 and the tool bar body 10 becomes tighter and tighter, and the deviation of the connection position is automatically reduced during the locking process, so that the tool bar body can be reduced. Occurs when the tightening torque between 10 and the slider 20 is too large The eccentricity of the shank reduces the yaw of the shank during high-speed rotation, improves the machining accuracy of the shank, and increases the service life of the shank.

Preferably, the machining tolerance of the second thread segment 232 is in addition to the tolerance specified by the 3A level, and a positive gap tolerance is further added to further reduce the second thread segment 232 and the inner thread segment. The thread clearance between the threaded portions 131 makes the locking of the second threaded segment 232 and the internally threaded portion 131 tighter and reduces the eccentricity during connection, as in the above-mentioned embodiment of the standard inch thread with an outer diameter of 5/8 inches. The tolerance range of the fill gap can be set to +0.003937 inches (about 0.1 mm) to +0.002362 inches (about 0.06 mm), so that the maximum of the cross section of the second thread section 232 and the internal thread section 131 is the largest. The gap is reduced to 0.0074 inches (about 0.187 mm).

The above-mentioned internal thread portion 131 and the external thread portion 23 may also meet the specifications of the metric standard thread, and the thread fit of the first thread segment 231 and the internal thread portion 131 is a middle-level fit in the metric standard. The processing accuracy of 131 is the 6H grade of the metric standard. The first thread section 231 of the slider 20 When the outer diameter of the first thread segment 231 is greater than 1.6 mm, the processing accuracy level of the first thread segment 231 is 6g in the metric standard. When the outer diameter of the first thread segment 231 is less than 1.4 mm, the The processing accuracy level is 6h level of the metric standard, and the processing accuracy level of the second thread segment 232 is higher than the processing accuracy level of the first thread segment 231, which is defined as a 4h level, so that the second thread segment 232 and the inner thread segment The thread gap T2 of the threaded portion 131 is smaller than the thread gap of the first threaded segment 231 and the internal threaded portion 131, and a positive gap compensation tolerance can be added to the second thread segment 232. The range of the gap compensation tolerance can be defined It is +0.1 mm to +0.06 mm, and the gap between the second thread segment 232 and the internal thread portion 131 is further reduced.

Preferably, the number of threads of the first thread segment 231 and the second thread segment 232 of the external thread portion 23 and the internal thread portion 131 is greater than or equal to the number of threads recommended by the standard specification, so that the slider The locking of 20 and the cutter body 10 is more stable. For example, if a slider with the same thread specification is compared, the slider 20 of the present invention moves from the end of the flange 221 away from the head 21 to the slider 20 away from the The length of one end of the head 21 is longer than the length of the existing slider from the end of the flange away from the head to the end of the existing slider away from the head.

With the above technical features, the seal 25 can eliminate the gap between the slider 20 and the shank body 10, increase the stability of the combination, absorb vibration, and have a water-stopping effect; and the external thread portion 23 of the slider 20 The segmented processing accuracy level allows the screwing process of the slider 20 and the tool body 10 to be locked more tightly, and to reduce the deviation error of the connection position during the locking process, which reduces the high speed rotation of the tool bar. Deflection and vibration increase the machining accuracy and service life of the tool holder.

Claims (9)

The utility model relates to a shank with a firmly combined pull head, which comprises a shank body including an end surface; and a connecting portion is formed axially in the shank body and an opening is formed in the end surface, which includes the same shaft. An internal thread portion and a straight portion of the core, the internal thread portion is provided on a side far from the end surface, and the processing accuracy specification of the internal thread portion is in accordance with a standard thread specification, and the straight portion is formed between the internal thread portion and the internal thread portion. Between the end surfaces; and a slider, which is screw-connected to the cutter body, and includes a head, an abutment portion, and an external thread portion, and the head and the external thread portion are respectively provided on the slider At the opposite ends of the head, the abutment portion is formed between the head portion and the male thread portion; wherein the abutment portion includes a flange that is radially protruding from the slider and an end of the abutment portion away from the head portion abuts against The end face of the tool holder body;
An extension part is inserted in the connecting part of the tool bar body and fits with the straight part;
A ring groove radially recessed in the extension portion; and a seal member provided in the ring groove and closing a gap between the extension portion of the slider and the straight portion of the cutter body; and the external thread portion, The screw threaded connection with the internal thread portion of the shank body includes a first thread segment located at an end away from the head. The processing accuracy specification of the first thread segment is in accordance with the specifications of the standard thread, and the first The thread fit between a thread segment and the internal thread portion is an intermediate fit of the standard thread specification;
A second thread segment located at an end close to the head, the processing accuracy specification of the second thread segment is in accordance with the standard thread specification, and the processing accuracy grade is better than that of the first thread segment; and one point The separation groove is radially recessed between the first thread section and the second thread section. The shank with a firmly connected slider according to claim 1, wherein the specification of the standard thread is the standard of the British standard thread, and the machining accuracy level of the internal thread portion of the shank body is 2B of the British standard Level, the processing accuracy level of the first thread segment of the slider is the 2A level of the British standard, and the processing accuracy level of the second thread segment of the slider is the 3A level of the English standard. The shank of the slider with a stable combination as described in claim 1, wherein the standard thread specification is a metric standard thread specification, and the machining accuracy grade of the internal thread portion of the shank body is the metric standard 6H grade When the outer diameter of the first thread segment of the slider is 1.6 mm or more, the processing accuracy level of the first thread segment is 6g of the metric standard, and when the outer diameter of the first thread segment is less than or equal to 1.4 mm, The processing accuracy level of the first thread segment is 6h level of the metric standard, and the processing accuracy level of the second thread segment of the slider is 4h level of the metric standard. The shank of the slider with a stable combination as described in claim 2, wherein the machining tolerance of the second thread segment of the slider is further added with a positive clearance tolerance. As described in claim 4, the shank with a firmly connected slider has a tolerance of +0.1 mm to +0.06 mm. The shank of a slider with a stable combination as described in claim 3, wherein the machining tolerance of the second thread segment of the slider is further added with a positive value of the gap compensation tolerance. As described in claim 6, the shank with a firmly coupled slider has a tolerance for the gap compensation of +0.1 mm to +0.06 mm. As described in claim 1, the shank with a firmly coupled slider, wherein a groove recessed in the shank body is provided radially between the straight portion of the shank body and the internal thread. According to any one of claims 1 to 8, the shank of the slider with a firmly coupled slider, wherein the slider further includes an axially penetrating through hole.