Double-cutting-edge grinding drill bit preprocessing blank

Abstract

The utility model relates to the technical field of medical instrument machining blanks, and discloses a double-cutting-edge grinding drill bit preprocessing blank which comprises a spherical blank body, the blank body comprises a vertex and a tail point which are symmetrical along the center face of the blank body, and a line passing through the vertex and the tail point is a blank body loop line. The blank body is equally divided into two parts by the blank body loop line; a first cutter face, a first spherical face, a second cutter face and a second spherical face are formed on the two sides of the annular line of the blank body respectively, and the diameter of the first spherical face and the diameter of the second spherical face are both smaller than the diameter of the annular line of the blank body. The diameter of the first tool face is gradually reduced from the blank body loop line to the first spherical surface, and the diameter of the second tool face is gradually reduced from the blank body loop line to the second spherical surface. The double-edge-grinding drill bit solves the problems that when an existing double-edge-grinding drill bit is used for machining, the product quality cannot be preliminarily guaranteed in advance, and the machining quality of a whole cutting edge is not easy to stably control.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument processing blank technical field especially, it relates to a double cutting edge drill bit pre -processing blank. BACKGROUND

[0002] In some orthopedic surgery, doctors often use drill bits to grind the bone tissue in the patient's body; in order to improve the grinding efficiency and safety in operation, some operations need to be watered in the grinding part, or some operations are carried out in underwater environment, and when the drill bit works in water, the water flow will produce large vortex, which will affect the operation field of view.

[0003] To solve the above problems, the applicant has applied for a patent with application number CN2025101452911, which discloses a spherical cutting edge drill bit for operation, which sets two cutting edges on the drill bit blank, and sets the horizontal height difference of the cutting edge on the cutting groove, so as to reduce the stirring of water when the drill bit rotates, thereby reducing the vortex and the influence on the operation field of view when grinding the bone under water.

[0004] When processing the above-mentioned spherical cutting edge drill bit, the raw material needs to be processed several times to process the cutting edge drill bit with cutting ability, and it cannot be completed by pre-processing blank; in this way, product evaluation can only be carried out after the completion of the finished product, preliminary product quality guarantee cannot be carried out in advance, and the processing quality of the whole cutting edge is not easy to control stably. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a double cutting edge drill bit pre-processing blank, solving the problem that the existing double blade drill bit cannot carry out preliminary product quality guarantee in advance and the processing quality of the whole cutting edge is not easy to control stably during processing.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] The utility model discloses a double cutting edge drill bit pre-processing blank, including the blank body of spherical, the blank body includes the vertex and tail point that are symmetrical to the center surface of blank body, and the line through the vertex and tail point is blank body ring line, and the blank body ring line divides the blank body into two equal parts;The two sides of blank body ring line form first tool face, first spherical surface and second tool face, second spherical surface respectively, and the diameter of first spherical surface and second spherical surface is all less than the diameter at blank body ring line;The diameter of first tool face gradually reduces from blank body ring line to first spherical surface, and the diameter of second tool face gradually reduces from blank body ring line to second spherical surface.

[0008] Further, the diameters of the first spherical surface and the second spherical surface are equal, and the arc widths of the first blade surface and the second blade surface are equal.

[0009] Further, the diameter of the blank body at the ring line is D, and the diameters of the first spherical surface and the second spherical surface are D*(95%-99%).

[0010] Further, the line connecting the vertex and the tail point is a center line, the included angle between the tangent of the first blade surface drawn from the vertex and the extension line of the center line is α, and the α is 90°-110°.

[0011] Further, the blank body at the tail point is fixedly connected with a transmission rod, the line connecting the vertex and the tail point is an axis line, and the axis center of the transmission rod is in a straight line with the axis line.

[0012] Further, the tail point of the blank body is provided with a blind hole, the bottom of the blind hole is provided with a transmission rod, the line connecting the vertex and the tail point is an axis line, and the axis center of the transmission rod is in a straight line with the axis line.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. The double-cutting-edge drill bit pre-processing blank of the utility model can be processed in advance, the product evaluation on the pre-processing blank is performed in advance, the quality of the drill bit is preliminarily ensured, and the processing quality of the whole cutting edge is more easily controlled and stabilized.

[0015] 2、The diameter of the blank body ring line is D, and the diameters of the first spherical surface and the second spherical surface are both D*(95%-99%), so that the horizontal height of the cutting edge is appropriately greater than the horizontal height D*(1%-5%) of the relief cutting edge, the processed grinding drill bit can not only ensure the cutting efficiency, but also is safer and more stable in cutting under such a height difference.

[0016] 3、The tail point of the blank body is provided with a blind hole, and the bottom of the blind hole is provided with a transmission rod, so that the grinding drill bit processed in this way can be sleeved with a sleeve on the transmission rod, the sleeve is deep into the blind hole, when the transmission rod drives the grinding drill bit to rotate, the sleeve is in a static state, then the transmission rod rotates in the sleeve, so that the transmission rod is in a non-exposed state, and the sleeve does not participate in rotation, so that the rotating transmission rod can avoid winding the soft tissue around the periphery, and will not cause harm to the patient, and will not affect the efficiency of the operation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a three-dimensional structure schematic diagram of a double-cutting-edge grinding drill bit pre-processing blank of the utility model;

[0018] Figure 2 is Figure 1 a structure schematic diagram of the blank body in figure 1;

[0019] Figure 3 is a blank body cross section schematic diagram without a transmission rod.

[0020] Among them, the blank body 1, the vertex 11, the tail point 12, the blank body ring line 13, the first tool face 14, the first spherical surface 15, the second tool face 16, the second spherical surface 17, the transmission rod 2. DETAILED DESCRIPTION

[0021] The utility model will be described in detail in combination with the drawings as follows:

[0022] Example 1,

[0023] This embodiment is a double-cutting-edge grinding drill bit pre-processing blank, which comprises a spherical blank body 1, the blank body 1 comprises a vertex 11 and a tail point 12 which are symmetrical along the center surface of the blank body 1, a line passing through the vertex 11 and the tail point 12 is a blank body ring line 13, and the blank body ring line 13 equally divides the blank body 1 into two parts; the two sides of the blank body ring line 13 respectively form a first tool face 14, a first spherical surface 15, a second tool face 16 and a second spherical surface 17, and the diameters of the first spherical surface 15 and the second spherical surface 17 are both smaller than the diameter of the blank body ring line 13; the diameter of the first tool face 14 gradually decreases from the blank body ring line 13 to the first spherical surface 15, and the diameter of the second tool face 16 gradually decreases from the blank body ring line 13 to the second spherical surface 17.

[0024] Specifically, in the embodiment, the diameter of the blank body at the ring line 13 is D, the diameters of the first spherical surface 15 and the second spherical surface 17 are both D*(95%-99%), and the arc widths of the first tool surface 14 and the second tool surface 16 are equal. It should be noted that in other embodiments, the diameters of the first spherical surface 15 and the second spherical surface 17 being both D*(95%-99%) can achieve the technical effects of the present application, and the preferred value in the embodiment is 97%. Such a setting can make the horizontal height of the cutting edge appropriately greater than the horizontal height D*3% of the relief, so that when the bone tissue is cut, not only the cutting efficiency can be ensured, but also the cutting is safer and more stable at such a height difference.

[0025] In the embodiment, the line connecting the vertex 11 and the tail point 12 is the center line, the angle between the tangent of the first tool surface 14 extending from the vertex 11 and the extension line of the center line is α, and α is 90°-110°. It should be noted that in other embodiments, α being 90°-110° can achieve the technical effects of the present application, and the preferred value in the embodiment is 100°. Such a setting can ensure safety and efficiency when the drill is cut.

[0026] In the embodiment, the blank body 1 at the tail point 12 is fixedly connected with a transmission rod 2, the line connecting the vertex 11 and the tail point 12 is the axis, and the axis of the transmission rod 2 is in a straight line with the axis. In use, the transmission rod 2 can be connected with a transmission mechanism, and the transmission mechanism drives the blank body 1 to rotate through the transmission rod 2.

[0027] The pre-machining blank of the double-cutting-edge drill bit of the embodiment can be machined in advance, and the pre-machining blank can be evaluated in advance to preliminarily ensure the quality of the drill bit and make the machining quality of the entire cutting edge more stable and controllable.

[0028] Embodiment 2,

[0029] The difference between the embodiment and the embodiment is that the tail point 12 of the blank body 1 is provided with a blind hole (not shown), the bottom of the blind hole is provided with a transmission rod 2, the line connecting the vertex 11 and the tail point 12 is the axis, and the axis of the transmission rod 2 is in a straight line with the axis. Such a setting can make the machined drill bit be sleeved with a sleeve on the transmission rod 2, the sleeve is deep into the blind hole, when the transmission rod 2 drives the drill bit to rotate, the sleeve is in a static state, and the transmission rod 2 rotates in the sleeve, so that the transmission rod 2 is in a non-exposed state, and the sleeve does not participate in the rotation, thereby avoiding the rotating transmission rod 2 from winding the soft tissue around the transmission rod 2, and avoiding the harm to the patient and the influence on the operation efficiency.

[0030] The above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application. The technical, shape, and structure parts not described in detail in the present application are well-known technologies.

Claims

1. A two-fluted drill preform, characterized by: The blank body includes a spherical blank body, the blank body includes a vertex and a tail point which are symmetrical along the center plane of the blank body, a line passing through the vertex and the tail point is a blank body ring line, the blank body ring line equally divides the blank body into two parts; two sides of the blank body ring line respectively form a first tool face, a first spherical surface and a second tool face, a second spherical surface, diameters of the first spherical surface and the second spherical surface are smaller than a diameter at the blank body ring line; a diameter of the first tool face gradually decreases from the blank body ring line to the first spherical surface, a diameter of the second tool face gradually decreases from the blank body ring line to the second spherical surface.

2. A bi-cutting edge drill bit preform according to claim 1, characterized in that: The diameters of the first spherical surface and the second spherical surface are equal, and the arc widths of the first tool face and the second tool face are equal.

3. A double cutting edge drill bit preform according to claim 1, wherein: The diameter at the blank body ring line is D, and the diameters of the first spherical surface and the second spherical surface are both D*(95%-99%).

4. A bi-cutting edge drill bit preform according to claim 1, wherein: A line connecting the vertex and the tail point is a center line, an included angle between a tangent of the first tool face from the vertex and an extension line of the center line is α, and the α is 90°-110°.

5. A bi-cutting edge drill bit preform according to any one of claims 1-4, characterized in that: A transmission rod is fixedly connected to the blank body at the tail point, a line connecting the vertex and the tail point is an axis line, and an axis center of the transmission rod is in a straight line with the axis line.

6. A bi-cutting edge drill bit preform according to any one of claims 1-4, characterized in that: A blind hole is arranged at the tail point of the blank body, a bottom of the blind hole is provided with a transmission rod, a line connecting the vertex and the tail point is an axis line, and an axis center of the transmission rod is in a straight line with the axis line.

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