Precise electroplating honing head

Abstract

The utility model relates to a precise electroplating honing head which comprises a honing transmission sleeve, a push rod matched with the middle of the inner wall of the honing transmission sleeve and a transmission pin penetrating through the honing transmission sleeve and the push rod in the radial direction. The middle end part of the push rod is fixed with the honing transmission sleeve through a set screw; the honing mandrel is of a four-stage step structure, the rear portion of the honing mandrel is a threaded section and a matching section, the middle of the honing mandrel is a guide section, the front portion of the honing mandrel is a honing section, and the conicity of the honing section is 1: 50; the rear portion of the honing mandrel extends into the honing transmission sleeve to be connected with the front portion of the push rod in a matched mode, the rear portion of the guide section of the honing mandrel is matched with a guide sleeve arranged in the front end of the honing transmission sleeve, and the front portion of the guide section of the honing mandrel and the honing section are matched with the honing sleeve. The rear end of the honing sleeve and the front end of the guide sleeve are fixed through a nut sleeve connected with the front end of the honing transmission sleeve in a matched mode. The tool can effectively guarantee the form and position precision of a workpiece, improves the efficiency, and has good interchangeability and economical efficiency.

Description

Technical Field

[0001] The utility model relates to a machining tool, in particular to a precision electroplating honing head, in particular to a honing head used for honing high-precision through holes or blind holes. Background Art

[0002] At present, most imported honing heads adopt a fixed structure with oilstone welded. For example, the "precision honing head" disclosed in CN205968597U. It includes a honing body, which is evenly distributed with honing mounting holes around the circumference. A honing oilstone is arranged in each of the honing mounting holes. An electric driving mechanism connected to the honing oilstone is also provided inside the honing body. The electric driving mechanism includes a driving rod connected to the honing oilstone. The end of the honing body is threadedly connected to a movable sleeve. A rotatable screw sleeve is provided in the movable sleeve. A screw is provided at the tail of the driving rod. The screw is installed in the screw sleeve. A driving motor for driving the screw sleeve to rotate is provided in the movable sleeve. It can adjust the feed rate of the honing oilstone in real time according to the real-time grinding environment, such as processing temperature and processing speed, to avoid damage to the workpiece caused by excessive processing temperature. However, there are some drawbacks, such as long manufacturing cycle of honing head base, high price of oilstone and easy wear and clogging of oilstone, which cannot meet the precision requirements and has low efficiency.

[0003] Other fixed-type honing rods reduce their outer diameter as the abrasive wears away, impacting hole machining accuracy and shortening their service life because the outer diameter cannot expand. Furthermore, some electroplated honing sleeves typically use ordinary straight sleeves, resulting in a loose connection and poor rigidity and accuracy, making them incapable of meeting the requirements for machining high-precision parts. Therefore, existing honing head structures require further improvement.

[0004] CN 220739676U discloses an "electroplated diamond step reamer honing tool for fine machining." The tool consists of a handle and a tool body. The tool body includes a large blade body and a small blade body, each coated with diamond particles. Spiral grooves are provided on each blade body, and cutting fluid channels are provided within each blade body. The outlets of the channels extend through the upper and lower sections of the blade body, respectively. Its beneficial effects include: sufficient cooling, extending tool life; simultaneous cooling of the upper and lower cooling ports of the blade body, reducing tool surface temperature and extending tool life; high surface quality: the upper and lower cooling ports not only cool the blade body but also flush away diamond abrasives that have flaked off the blade body, preventing them from being squeezed onto the machined surface and improving surface quality; simultaneous machining of the two blade sections provides good tool support; and improved machining efficiency: the combined tooling reduces machining time, improves machining efficiency, and saves turnaround time. The technical solution disclosed in this patent document represents a valuable advancement in the relevant technical field. Utility Model Content

[0005] The purpose of the utility model is to provide a precision electroplating honing head, which can effectively ensure the shape and position accuracy of the workpiece and improve efficiency; and the electroplating honing head can be electroplated again and repaired and used after the abrasive falls off, and has good interchangeability and economy.

[0006] The utility model describes a precision electroplated honing head, comprising a honing transmission sleeve, a push rod matched with the middle part of the inner wall of the honing transmission sleeve, and a transmission pin radially passing through the honing transmission sleeve and the push rod; the middle end of the push rod is fixed to the honing transmission sleeve by a set screw; it also includes a honing spindle, the honing spindle is a four-step structure, the rear part of which is a threaded section and a matching section, the middle part is a guide section, and the front part is a honing section, and the honing section has a taper of 1:50; the rear part of the honing spindle extends into the honing transmission sleeve and is matched with the front part of the push rod, the rear part of the guide section of the honing spindle is matched with the guide sleeve provided in the front end of the honing transmission sleeve, and the front part of the guide section of the honing spindle and the honing section are matched with the honing sleeve; the rear end of the honing sleeve and the front end of the guide sleeve are fixed by a nut sleeve matched with the front end of the honing transmission sleeve.

[0007] Furthermore, a through oblong hole is provided at the rear middle portion of the honing transmission sleeve, a radial threaded hole is provided at the middle portion, and two pin holes symmetrical along the axis are provided at the front end of the honing transmission sleeve.

[0008] Furthermore, a radial through hole is provided at the rear of the push rod, an axial waist-shaped groove is provided in the middle, and a coaxial assembly hole and an axial threaded hole are provided in the front of the push rod; the radial through hole at the rear of the push rod corresponds to the oblong hole of the honing transmission sleeve, and the transmission pin cooperates with the oblong hole and the radial through hole; the radial threaded hole corresponds to the axial waist-shaped groove, and the set screw cooperates with the radial threaded hole and tightens the axial waist-shaped groove.

[0009] Furthermore, a hexagonal hole is provided at the front end of the honing mandrel; the rear part of the honing mandrel extends into the honing transmission sleeve, and the threaded section at the rear part is matched with the axial threaded hole of the push rod, and the matching section is matched with the assembly hole of the push rod; the rear part of the guide section of the honing mandrel is matched with the guide sleeve provided in the front end of the honing transmission sleeve, and the front end of the guide sleeve is provided with a flange, which is in close contact with the front end of the honing transmission sleeve.

[0010] Furthermore, a stepped hole is provided in the rear portion of the honing sleeve, which is clearance-matched with the guide section of the honing mandrel; a tapered hole with a taper of 1:50 is provided in the front portion of the honing sleeve; the honing sleeve cooperates with the honing section and the front portion of the guide section of the honing mandrel; the tapered hole in the front portion of the honing sleeve forms a conical surface seal with the honing section of the honing mandrel; a circular boss is also provided at the rear end of the honing sleeve, and two symmetrical limit grooves are provided on the circular boss; an abrasive layer is also electroplated on the outside of the front portion of the honing sleeve, and a double-headed spiral groove is provided on the abrasive layer.

[0011] Furthermore, the annular boss at the rear end of the honing sleeve fits with the flange at the front end of the guide sleeve, and two anti-rotation pins pass through the two limiting grooves on the annular boss and the two through holes on the guide sleeve flange to cooperate with the two pin holes at the rear end of the honing transmission sleeve.

[0012] Furthermore, the abrasive layer on the outer front portion of the honing sleeve is cubic boron nitride or diamond.

[0013] Furthermore, a step is provided in the front end of the nut sleeve, and the nut sleeve is threadedly connected to the front end of the honing transmission sleeve, and the honing sleeve and the guide sleeve are pressed and fixed by the step provided in the front end.

[0014] Furthermore, a stepped threaded hole is provided at the rear end of the honing transmission sleeve, and the stepped threaded hole is connected to the honing equipment.

[0015] Beneficial effects of the utility model:

[0016] Since the honing sleeve and the electroplated abrasive cubic boron nitride or diamond adopt a fixed integral design, they expand evenly and overcome the out-of-roundness caused by the oilstone gap on radial runout.

[0017] Due to the use of push rods and guide sleeves for positioning, the entire transmission is gapless and the feed is stable; the honing transmission sleeve, guide sleeve and honing sleeve are connected with positioning pins and nuts to form a stable connection structure, thus ensuring the stability of the transmission.

[0018] Since the honing sleeve and the honing spindle form a conical seal with no gap in the axial direction, it can ensure the stability of the rotation center accuracy after expansion, and has the characteristics of high accuracy and high efficiency after adjustment, and the device is easy to manufacture.

[0019] Since it can be used according to different hole diameters and different materials, it only requires replacing the honing sleeve and electroplating abrasives of different particle sizes. It is easy to replace and has a wide range of uses.

[0020] This precision electroplated honing head is suitable for workpieces with high hole honing requirements on horizontal honing machines. The electroplated honing head can achieve higher precision through grinding; it has good adaptability and can hone both through holes and blind holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 It is a structural diagram of the honing spindle;

[0023] Figure 3 for Figure 2 A-direction view;

[0024] Figure 4Schematic diagram of the structure of the honing sleeve;

[0025] Figure 5 Schematic diagram of the structure of the guide sleeve;

[0026] Figure 6 for Figure 5 Left view of .

[0027] In the figure (technical features indicated by marks):

[0028] 1—honing transmission sleeve, 11—oblong hole, 12—radial threaded hole, 13—pin hole;

[0029] 2—push rod, 21—radial through hole, 22—axial waist-shaped groove, 23—assembly hole, 24—axial threaded hole;

[0030] 3—Transmission pin;

[0031] 4—Set screw;

[0032] 5—honing spindle, 51—threaded section, 52—matching section, 53—guide section, 54—honing section, 55—hexagonal socket;

[0033] 6—guide sleeve, 61—through hole;

[0034] 7—honing sleeve, 71—limiting groove, 72—abrasive layer, 73—double-headed spiral groove;

[0035] 8—Anti-rotation pin;

[0036] 9—Nut sleeve, 91—Step. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] Reference Figures 1 to 6The illustrated embodiment shows a precision electroplated honing head, comprising a honing transmission sleeve 1, a push rod 2 mating with the middle portion of the inner wall of the honing transmission sleeve 1, and a transmission pin 3 radially passing through the honing transmission sleeve 1 and the push rod 2. The transmission pin can drive the push rod to move forward and backward when it moves forward and backward. The middle portion of the push rod 2 is fixed to the honing transmission sleeve 1 by a set screw 4. The honing spindle 5 is a four-step structure, with a threaded section 51 and a mating section 52 at the rear, a guide section 53 in the middle, and a front section. The honing section 54 has a taper of 1:50; the rear portion of the honing mandrel 5 extends into the honing transmission sleeve 1 and is connected to the front portion of the push rod 2, the rear portion of the guide section 53 of the honing mandrel 5 cooperates with the guide sleeve 6 provided in the front end of the honing transmission sleeve 1, and the front portion of the guide section 53 of the honing mandrel 5 and the honing section 54 cooperate with the honing sleeve 7; the rear end of the honing sleeve 7 and the front end of the guide sleeve 6 are fixed by a nut sleeve 9 that is connected to the front end of the honing transmission sleeve 1.

[0039] A through oblong hole 11 is provided at the rear middle portion of the honing transmission sleeve 1 , a radial threaded hole 12 is provided in the middle portion, and two axially symmetrical pin holes 13 are provided at the front end of the honing transmission sleeve 1 .

[0040] A radial through hole 21 is provided at the rear of the push rod 2, an axial waist-shaped groove 22 is provided in the middle, and a coaxial assembly hole 23 and an axial threaded hole 24 are provided in the front of the push rod 2; the radial through hole 21 at the rear of the push rod 2 corresponds to the oblong hole 11 of the honing transmission sleeve 1, and the transmission pin 3 cooperates with the oblong hole 11 and the radial through hole 21; the radial threaded hole 12 corresponds to the axial waist-shaped groove 22, and the set screw 4 cooperates with the radial threaded hole 12 and tightens the axial waist-shaped groove 22.

[0041] A hexagonal socket 55 is provided at the front end of the honing mandrel 5. The rear portion of the honing mandrel 5 extends into the honing drive sleeve 1, with the threaded section 51 at the rear engaging the axial threaded hole 24 of the push rod 2, and the mating section 52 engaging the assembly hole 23 of the push rod 2. The rear portion of the guide section 53 of the honing mandrel 5 engages with the guide sleeve 6 located within the front end of the honing drive sleeve 1. The front end of the guide sleeve 6 is provided with a flange that abuts against the front end of the honing drive sleeve 1. Using a hexagonal socket wrench in conjunction with the hexagonal socket at the front end of the honing mandrel can tighten or loosen the connection between the honing mandrel and the push rod.

[0042] A stepped hole is provided in the rear portion of the honing sleeve 7, which has a clearance fit with the guide section 53 of the honing mandrel 5; a tapered hole with a taper of 1:50 is provided in the front portion of the honing sleeve 7; the honing sleeve 7 cooperates with the honing section 54 of the honing mandrel 5 and the front portion of the guide section 53; the tapered hole in the front portion of the honing sleeve 7 forms a conical surface seal with the honing section 54 of the honing mandrel 5; a circular annular boss is also provided at the rear end of the honing sleeve 7, on which two symmetrical limiting grooves 71 are provided; an abrasive layer 72 is electroplated on the outside of the front portion of the honing sleeve 7, and a double-headed spiral groove 73 is provided on the abrasive layer 72. The abrasive layer is also spiral-shaped, with two-thirds of the height of the abrasive grains buried in the electroplated metal binder layer to fix them, and the remaining part is exposed outside the substrate as the main cutting force; at the same time, the spiral edge also ensures a sharp cutting edge, and the exposed sharp corners of these abrasive grains grind the hole wall, with strong cutting ability; the double-headed spiral groove is used for chip removal and heat dissipation.

[0043] The annular boss at the rear end of the honing sleeve 7 fits with the flange at the front end of the guide sleeve 6, and two anti-rotation pins 8 pass through the two limiting grooves 71 on the annular boss and the two through holes 61 on the flange of the guide sleeve 6 and cooperate with the two pin holes 13 at the rear end of the honing transmission sleeve 1.

[0044] The abrasive layer 72 on the front outer surface of the honing sleeve 7 is cubic boron nitride or diamond. It is used to hone the hole, and cubic boron nitride or diamond of different particle sizes can also be electroplated according to the workpiece of different materials.

[0045] The front end of the nut sleeve 9 is provided with a step 91 , and the nut sleeve 9 is threadedly connected to the front end of the honing transmission sleeve 1 , and the honing sleeve 7 and the guide sleeve 6 are pressed and fixed by the step 91 provided in the front end.

[0046] The rear end of the honing transmission sleeve 1 is provided with a stepped threaded hole, which is connected to the honing equipment.

[0047] The working principle of this utility model is:

[0048] Assemble the honing head; fit the honing sleeve 7 over the guide section 53 and honing section 54 of the honing mandrel 5. Insert the rear portion of the honing mandrel 5 through the guide sleeve 6, which fits inside the front end of the honing drive sleeve 1. Screw the threaded section 51 of the honing mandrel 5 into the axial threaded hole 24 of the push rod 2. Use an Allen wrench engaged with the hexagonal hole 55 at the front center of the honing mandrel 5 to rotate the honing mandrel 5 backward, securing the connection between the honing mandrel 5 and the push rod 2. During operation, the push rod 2 moves the honing mandrel 5 back and forth within the honing drive sleeve 1, causing the honing sleeve 7 to expand or contract.

[0049] Install the drive pin; insert the drive pin 3 radially through the oblong hole 11 of the honing drive sleeve 1 and the radial through-hole 21 of the push rod 2. The drive pin 3 moves axially toward the front end (the drive pin 3 is mainly used for position adjustment), driving the push rod 2 and the honing mandrel 5 to move toward the front end. Under the outward expansion force of the outer cone of the honing mandrel 5, the electroplated honing sleeve 7 expands evenly on the conical surface of the honing mandrel 5, maintaining the same shape and position accuracy. When the workpiece expands to the required honing diameter, the workpiece is honed by electroplating diamond or cubic boron nitride.

[0050] Compared with the honing sleeve with oilstone (the honing sleeve with oilstone generally adopts intermittent cutting), the cutting surface of the electroplated honing sleeve is a full circle, more uniform, and has more contact areas with the hole wall, so the roundness and cylindricity of the honed hole are higher.

[0051] Grind the honing sleeve 7 to ensure the accuracy of the external cylindrical abrasive after electroplating. The honing sleeve 7 is placed on the conical surface of the honing mandrel 5 and expanded to the specified size before fine grinding. The diamond (or cubic boron nitride) on the abrasive layer of the honing sleeve 7 must meet the required accuracy and size. After fine grinding, an expansion test is performed, expanding the honing sleeve 7 to different diameters. The taper of the honing sleeve 7 is not allowed to change.

[0052] The tapered mandrel 5 and honing sleeve 7 of this embodiment feature a gapless dynamic fit, with the conical surfaces in contact without gap, fully supporting all electroplated cutting areas. This gives the honing head high rigidity, and the honing sleeve uniformly expands radially, providing excellent coaxiality, resetting, and load-bearing properties, resulting in high honing accuracy. Furthermore, the gapless dynamic fit of the tapered mandrel and honing sleeve allows for precise adjustment of the rotation center and feed, ensuring stable rotation center accuracy and excellent coaxiality of the honing sleeve after expansion. This device boasts high adjustment accuracy and simple manufacturing.

Claims

1. A precision electroplated honing head, comprising a honing transmission sleeve (1), a push rod (2) engaged with the middle portion of the inner wall of the honing transmission sleeve (1), and a transmission pin (3) radially passing through the honing transmission sleeve (1) and the push rod (2); the middle end portion of the push rod (2) is fixed to the honing transmission sleeve (1) by a set screw (4), and is characterized in that: It also includes a honing spindle (5), the honing spindle (5) is a four-step structure, the rear portion of which is a threaded section (51) and a matching section (52), the middle portion is a guide section (53), and the front portion is a honing section (54), and the honing section (54) has a taper of 1:50; the rear portion of the honing spindle (5) extends into the honing transmission sleeve (1) and is matched with the front portion of the push rod (2), the rear portion of the guide section (53) of the honing spindle (5) is matched with the guide sleeve (6) provided in the front end of the honing transmission sleeve (1), and the front portion of the guide section (53) of the honing spindle (5) and the honing section (54) are matched with the honing sleeve (7); the rear end of the honing sleeve (7) and the front end of the guide sleeve (6) are fixed by a nut sleeve (9) matched with the front end of the honing transmission sleeve (1).

2. The precision electroplating honing head according to claim 1 is characterized in that: The honing transmission sleeve (1) is provided with a through oblong hole (11) at the rear middle portion, a radial threaded hole (12) at the middle portion, and two pin holes (13) symmetrical along the axis are provided at the front end of the honing transmission sleeve (1).

3. The precision electroplating honing head according to claim 2 is characterized in that: The rear portion of the push rod (2) is provided with a radial through hole (21), the middle portion is provided with an axial waist-shaped groove (22), and the front portion of the push rod (2) is provided with a coaxial assembly hole (23) and an axial threaded hole (24); the radial through hole (21) at the rear portion of the push rod (2) corresponds to the oblong hole (11) of the honing transmission sleeve (1), and the transmission pin (3) cooperates with the oblong hole (11) and the radial through hole (21); the radial threaded hole (12) corresponds to the axial waist-shaped groove (22), and the set screw (4) cooperates with the radial threaded hole (12) and tightens the axial waist-shaped groove (22).

4. The precision electroplating honing head according to claim 3 is characterized in that: The front end of the honing spindle (5) is also provided with a hexagonal hole (55); the rear part of the honing spindle (5) extends into the honing transmission sleeve (1), and the threaded section (51) at the rear part thereof is matched with the axial threaded hole (24) of the push rod (2), and the matching section (52) is matched with the assembly hole (23) of the push rod (2); the rear part of the guide section (53) of the honing spindle (5) is matched with the guide sleeve (6) provided in the front end of the honing transmission sleeve (1), and the front end of the guide sleeve (6) is provided with a flange, which is in close contact with the front end of the honing transmission sleeve (1).

5. The precision electroplated honing head according to claim 4, characterized in that: The rear portion of the honing sleeve (7) is provided with a stepped hole, which is clearance-matched with the guide section (53) of the honing mandrel (5); the front portion of the honing sleeve (7) is provided with a tapered hole with a taper of 1:50; the honing sleeve (7) is matched with the honing section (54) and the front portion of the guide section (53) of the honing mandrel (5); the tapered hole at the front portion of the honing sleeve (7) forms a conical surface sealing match with the honing section (54) of the honing mandrel (5); a circular boss is further provided at the rear end of the honing sleeve (7), and two symmetrical limiting grooves (71) are provided on the circular boss; an abrasive layer (72) is further electroplated on the outside of the front portion of the honing sleeve (7), and a double-headed spiral groove (73) is provided on the abrasive layer (72).

6. The precision electroplated honing head according to claim 5, characterized in that: The annular boss at the rear end of the honing sleeve (7) fits with the flange at the front end of the guide sleeve (6), and two anti-rotation pins (8) pass through two limiting grooves (71) on the annular boss and two through holes (61) on the flange of the guide sleeve (6) to fit with two pin holes (13) at the rear end of the honing transmission sleeve (1).

7. The precision electroplated honing head according to claim 6, characterized in that: The abrasive layer (72) on the front outer surface of the honing sleeve (7) is cubic boron nitride or diamond.

8. The precision electroplated honing head according to claim 1, characterized in that: A step (91) is provided in the front end of the nut sleeve (9), and the nut sleeve (9) is threadedly connected to the front end of the honing transmission sleeve (1), and the honing sleeve (7) and the guide sleeve (6) are pressed and fixed by the step (91) provided in the front end.

9. The precision electroplated honing head according to claim 1, characterized in that: A stepped threaded hole is provided at the rear end of the honing transmission sleeve (1), and the stepped threaded hole is connected to the honing equipment.

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